WO2024088014A1 - Bms休眠唤醒电路、方法、bms和用电设备 - Google Patents

Bms休眠唤醒电路、方法、bms和用电设备 Download PDF

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Publication number
WO2024088014A1
WO2024088014A1 PCT/CN2023/122416 CN2023122416W WO2024088014A1 WO 2024088014 A1 WO2024088014 A1 WO 2024088014A1 CN 2023122416 W CN2023122416 W CN 2023122416W WO 2024088014 A1 WO2024088014 A1 WO 2024088014A1
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WO
WIPO (PCT)
Prior art keywords
wake
bms
chip
switch tube
signal
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Ceased
Application number
PCT/CN2023/122416
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English (en)
French (fr)
Inventor
陈伟杰
李伟强
叶伏明
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to EP23881593.0A priority Critical patent/EP4516577A4/en
Publication of WO2024088014A1 publication Critical patent/WO2024088014A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/305—Communication interfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/663—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements using battery or load disconnect circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present application relates to the field of battery management, and in particular to a BMS sleep wake-up circuit, method, BMS and power-consuming equipment.
  • Charging is an indispensable function for new energy electric vehicles.
  • the vehicle design requires that the charging gun must be able to wake up the battery management system (BMS) after being inserted into the vehicle.
  • BMS battery management system
  • engineers focus on the gun plug wake-up function, and often ignore the need to support the BMS to enter sleep mode when the charging gun is not unplugged. At this time, when charging is completed or stopped but the charging gun is not unplugged, the BMS cannot enter sleep mode, thereby increasing the lead-acid power consumption of the entire vehicle.
  • the embodiments of the present application provide a BMS sleep wake-up circuit, method, BMS and electrical equipment, which can solve the problem that the charging gun charging device cannot enter sleep mode without unplugging the BMS.
  • an embodiment of the present application provides a BMS sleep wake-up circuit, including:
  • a first detection port used to connect to the communication interface of the charging device when the charging device is connected
  • An enabling circuit is connected to the first detection port and the wake-up chip of the BMS, and is used to generate an enabling level of a preset duration according to a first level signal provided by the charging device to enable the wake-up chip to start and wake up the BMS in a dormant state when the charging device is connected;
  • the control circuit is used to output a self-locking signal to the wake-up chip to maintain the wake-up chip in a startup state after the BMS is awakened, and is also used to stop outputting the self-locking signal to shut down the wake-up chip when receiving a sleep signal, so that the BMS enters a sleep state.
  • an enabling circuit is provided to generate an enabling level of a preset duration according to a first level signal provided by a communication interface of the charging device when a charging device is connected.
  • the enabling level of the preset duration enables the wake-up chip to start to wake up the BMS in a dormant state (i.e., start), and a self-locking signal is output through the control circuit so that the wake-up chip keeps the BMS awake; in addition, when the charging device is kept connected, since the enabling level is only maintained for a preset duration, the wake-up chip is turned off after the self-locking signal is canceled when it needs to go into dormancy, so that the BMS can enter a dormant state, solving the problem in the related art that the BMS cannot enter a dormant state if the charging device is not unplugged; in addition, since the generated enabling level will inevitably generate an edge signal, whether it is an edge-triggered or level-triggered wake-up chip,
  • the enabling circuit includes:
  • a detection module connected to the first detection port, configured to output a first detection signal according to a first level signal provided by the charging device;
  • the enabling module is connected to the detecting module and is used to generate and output an enabling level of a preset duration according to the first detecting signal.
  • an embodiment of an enabling circuit wherein a detection module detects a first level signal provided by a charging device, and the enabling module generates an enabling level of a preset duration according to the first level signal to start the wake-up
  • the chip is used to wake up the BMS in sleep state, and the circuit is simple and reliable.
  • the detection module includes a first switch tube and a first resistor, the control end of the first switch tube is connected to the first detection port, the first end of the first switch tube is connected to the first power supply through the first resistor, the second end of the first switch tube is connected to the ground, the first end of the first switch tube is connected to the enable module, and the first switch tube outputs a first detection signal under the drive of the first level signal.
  • the first level signal is, for example, a high level signal
  • the first detection signal is, for example, a low level signal
  • the circuit structure is simple and reliable, and the cost is low.
  • the detection module also includes a first energy storage device and a first unidirectional conductive device, the input end of the first unidirectional conductive device is connected to the first detection port, the output end of the first unidirectional conductive device is connected to one end of the first energy storage device and the control end of the first switch tube, the other end of the first energy storage device is grounded, and the first energy storage device is used to store energy based on the first level signal to drive the first switch tube to turn on.
  • an implementation method of an enabling module is provided.
  • the control end of the first switching tube can be maintained at a certain stable level above a certain frequency duty cycle of the PWM signal through energy storage filtering by the first energy storage device, so that the first switching tube can be turned on and output the first detection signal; in addition, in the low-level stage of the PWM signal, the first unidirectional conductive device can prevent the voltage at the control end of the first switching tube from being pulled down by the input, and the first detection signal of sufficient length cannot be provided, thereby causing the enabling circuit to enable the wake-up chip to fail to start.
  • the detection module further includes a voltage stabilizing device, which is connected to the control end of the first switch tube and is used to stabilize the voltage of the control end of the first switch tube.
  • the operation starts, and the voltage at the control end of the first switch tube is clamped at a certain voltage value to protect the first switch tube from being damaged.
  • the maximum clamping voltage of the selected voltage stabilizer device needs to be less than the withstand voltage from the control end to the second end of the first switch tube.
  • a second detection port and a second unidirectional conductive device are further included, and the second unidirectional conductive device is forwardly connected between the second detection port and the control end of the first switch tube.
  • the second detection port can be used to access the level signal or the PWM signal, providing another channel for waking up and sleeping the BMS.
  • the second unidirectional conductive device has the same function as the first unidirectional conductive device mentioned above.
  • the enabling module includes a second energy storage device, a second switch tube, a second resistor and a third resistor;
  • One end of the second energy storage device is connected to the output of the detection module, the second end of the second energy storage device is connected to the control end of the second switch tube, the first end of the second switch tube is connected to the second power supply, the second end of the second switch tube is grounded through a third resistor, the second end of the second switch tube is also connected to the first enable pin of the wake-up chip, and the second resistor is connected between the control end and the second end of the second switch tube;
  • the second switch tube is turned on based on the first detection signal to output the enable level, and the second energy storage device is charged for a preset time period using the first power source through the first resistor based on the first detection signal, and then the second switch tube is turned off to stop outputting the enable level.
  • the second energy storage device such as the principle that the voltage at both ends of the capacitor does not change suddenly, is utilized to make the control end of the second switch tube present a low level and be turned on to output the enable level.
  • the second power supply charges the second energy storage device, and the voltage rises to make the second switch tube turn off to stop outputting the enable level.
  • the second switch tube can be opened in a certain time window, thereby outputting the enable level to enable the wake-up chip to start, and wake up the BMS in the dormant state.
  • the enabling module further includes a third unidirectional conducting device, the third unidirectional conducting device is forwardly connected to Between the second end of the second switch tube and the first enable pin of the wake-up chip, it is prevented that other wake-up source voltages that use the first enable pin of the wake-up chip are connected in series to affect the normal operation of the enable module.
  • control circuit includes one of the control chips in the BMS, and a self-locking pin of the control chip is connected to a second enable pin of the wake-up chip to provide a self-locking signal.
  • the enable circuit and the control circuit are connected to different pins of the wake-up chip, so that the control of the wake-up chip by the enable level and the control of the wake-up chip by the self-locking signal are independent of each other, so that the wake-up chip can be shut down after the self-locking signal is revoked to achieve sleep, thereby reducing the lead-acid consumption of the battery.
  • the wake-up chip is a power chip for supplying power to the BMS, or a control chip for controlling the BMS to sleep or wake up.
  • the first level signal includes a high level signal and a PWM signal.
  • level-triggered and/or edge-triggered power chips and control chips so that the level-triggered and/or edge-triggered BMS can also realize charging device access wake-up and sleep.
  • control circuit includes one of the control chips in the BMS to facilitate system configuration.
  • an embodiment of the present application provides a BMS sleep wake-up method, including:
  • an enable level of a preset duration is generated according to a first level signal provided by the charging device to enable the wake-up chip of the BMS to start up to wake up the BMS;
  • the self-locking signal is stopped to turn off the wake-up chip and put the BMS into sleep mode.
  • the BMS when the charging device is connected, the BMS can generate an enable level of a preset duration through the first level signal provided by the charging device.
  • the enable level of the preset duration enables the wake-up chip to start to wake up the BMS, and the wake-up chip keeps the BMS awake by outputting a self-locking signal; in addition, when the charging device is not unplugged, since the enable level is only maintained for a preset duration, the wake-up chip is turned off after the self-locking signal is canceled when it needs to sleep, so that the BMS can enter sleep mode, which solves the problem in the related art that the BMS cannot enter sleep mode if the charging device is not unplugged; and, since the generated enable level will generate an edge signal, both edge-triggered and level-triggered wake-up chips can satisfy the requirement of keeping the BMS in sleep mode while keeping the charging device connected, thereby reducing the lead-acid consumption of the battery.
  • the first level signal includes a high level signal and a PWM signal.
  • the BMS is compatible with level triggering and/or edge triggering, so that the level triggered and/or edge triggered BMS can also realize charging device access wake-up and sleep.
  • an embodiment of the present application provides a BMS, including the above-mentioned BMS sleep wake-up circuit.
  • the BMS when the charging device is connected, the BMS can enable the wake-up chip to start for a period of time through the level signal provided by the charging device to wake up the BMS in the dormant state, and the awakened BMS keeps the wake-up chip started by outputting a self-locking signal; in addition, when the charging device is not unplugged, since the enable level is only maintained for a preset period of time, the BMS can enter the dormant state after the self-locking signal is canceled when it needs to sleep, which solves the problem that the BMS cannot enter the dormant state if the charging device is not unplugged, thereby reducing the lead-acid consumption of the battery.
  • an embodiment of the present application provides an electrical device, including a battery and the above-mentioned BMS.
  • the level signal provided by the charging device can be used to enable the wake-up chip to start for a period of time to wake up the BMS of the electric device in the sleep state, and the awakened BMS keeps the wake-up chip started by outputting a self-locking signal; in addition, when the charging device is not unplugged, since the enable level is only maintained for a preset period of time, the BMS can enter the sleep state after the self-locking signal is canceled when sleep is needed, which solves the problem that the BMS cannot enter the sleep state if the charging device is not unplugged, thereby reducing the lead-acid consumption of the battery.
  • FIG1 is a module diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • FIG2 is a module diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • FIG3 is a circuit diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • FIG4 is a flow chart of a BMS sleep wake-up method provided in some embodiments of the present application.
  • Charging device 10 communication interface 11, first detection port 110, second detection port 112, enabling circuit 120, detection module 122, enabling module 124, control circuit 130, sampling circuit 140, wake-up chip 200;
  • the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • the charging wake-up function is often used in conjunction with the edge-valid wake-up function of the wake-up chip, but there are currently many application chips that do not support edge-valid wake-up.
  • the inventive concept of the present application is to allow the wake-up chip used in the charging wake-up function to have a basic level wake-up function, and of course it can also be compatible with the edge-valid wake-up function.
  • the embodiment of the present application mainly introduces an inventive concept for a BMS interface circuit with a high-level or pulse width modulation (PWM) signal input interface for a charging device (such as a charging gun), which supports wake-up on access and also supports sleep without being unplugged.
  • PWM pulse width modulation
  • the wake-up channel of the wake-up chip used can have a level or edge wake-up function.
  • the charging gun interface supports high-level communication interface (such as AC_CP interface, providing power transmission signal) and the charging gun muzzle is plugged in to wake up. It also supports sleep mode without unplugging the charging gun under the control of BMS. After charging is completed or stopped, the BMS can enter sleep mode, saving energy and reducing the loss of lead-acid battery in the whole vehicle.
  • high-level communication interface such as AC_CP interface, providing power transmission signal
  • FIG1 is a block diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • the BMS sleep wake-up circuit includes a first detection port 110 , an enabling circuit 120 and a control circuit 130 .
  • the first detection port 110 is used to connect to the communication interface 11 of the charging device 10 when the charging device 10 is connected; the enabling circuit 120 is connected to the first detection port 110 and the wake-up chip 200 of the BMS, and generates an enabling level of a preset duration according to the first level signal provided by the charging device 10 to enable the wake-up chip 200 to start waking up the BMS in a sleep state; the control circuit 130 is used to output a self-locking signal to the wake-up chip 200 after the BMS is awakened to maintain the wake-up chip 200 in a started state, and is also used to stop outputting the self-locking signal to turn off the wake-up chip 200 when receiving the sleep signal, so that the BMS enters the sleep state, which solves the problem in the related art that the charging device 10 cannot enter the sleep state without unplugging the BMS, and reduces the lead-acid consumption of the battery.
  • the charging device 10 is, for example, a charging gun, or a general charging adapter on the market.
  • the communication interface 11 of the charging device 10 is, for example, the AC_CP interface of the charging gun, or the communication interface of the charging adapter.
  • the power transmission signal output to the charging interface through the communication interface 11 i.e., the AC_CP interface
  • the power transmission signal enters the pulse change (i.e., PWM signal) stage of data communication.
  • the charging gun outputs charging power to the charging interface.
  • the power transmission signal returns to a high level.
  • the first detection port 110 when the charging gun is connected, the first detection port 110 is connected to the communication interface 11 of the charging device 10, and receives a first level signal, such as a high level or a PWM signal, provided by the communication interface 11 of the charging device 10. On the contrary, when the charging device 10 is not connected, the first detection port 110 is a low level, which can also be a second level signal.
  • a first level signal such as a high level or a PWM signal
  • the enable level of the preset duration generated by the enable circuit 120 according to the first level signal is a high level, which must also include a rising edge and a falling edge. Then, the wake-up chip 200 of the BMS can be enabled and started with a high level validity, or with a rising edge validity.
  • the control circuit 130 is a part of the BMS. When the BMS in the sleep state is awakened, the control circuit 130 is started.
  • the control circuit 130 outputs a self-locking signal to maintain the wake-up chip 200 in the started state, so that the wake-up chip 200 always wakes up the BMS to work, thus completing the wake-up process of the BMS in the dormant state.
  • the self-locking signal should be generated within a preset time length.
  • This BMS wake-up and sleep control method can be applicable to a level- and/or edge-triggered wake-up chip 200.
  • the enabling circuit 120 detects the first level signal to determine that the charging device 10 is connected.
  • the enabling level of the preset duration is output to enable the wake-up chip 200 to start to wake up the BMS in the dormant state, and the self-locking signal is output through the control circuit 130 so that the wake-up chip 200 keeps the BMS awake; in addition, when the charging device 10 remains connected, since the enabling level is only maintained for a preset duration, the wake-up chip 200 is turned off after the self-locking signal is canceled when it needs to sleep, so that the BMS can enter the dormant state, solving the problem that the BMS cannot enter the dormant state if the charging device 10 is not unplugged.
  • the wake-up chip 200 can satisfy the requirement of being able to sleep the BMS while keeping the charging device 10 connected, thereby reducing the lead-acid consumption of the battery.
  • FIG. 2 is a module diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • the enabling circuit 120 includes a detection module 122 and an enabling module 124.
  • the detection module 122 is connected to the first detection port 110, and is used to output a first detection signal according to a first level signal provided by the charging device 10;
  • the enabling module 124 is connected to the detection module 122, and is used to generate an enabling level of a preset duration according to the first detection signal.
  • the enabling level is used to output to the wake-up chip 200 of the BMS to enable the wake-up chip 200 to start, so as to wake up the BMS.
  • the detection module 122 is also used to detect the second level signal (low level) and output the second detection signal (high level), and the enabling module 124 is also used to receive the second detection signal and stop outputting the enabling level (high level or rising edge). At this time, the output is low level.
  • the enabling module 124 is also used to receive the second detection signal and stop outputting the enabling level (high level or rising edge). At this time, the output is low level.
  • the wake-up chip 200 with a high level or a rising edge the low level cannot enable the start wake-up signal.
  • the circuit design is simple and reliable.
  • FIG. 3 is a circuit diagram of a BMS sleep wake-up circuit provided in some embodiments of the present application.
  • the detection module 122 includes a first switch tube Q1 and a first resistor R1, the control end of the first switch tube Q1 is connected to the first detection port 110, the first end of the first switch tube Q1 is connected to the first power supply V1 through the first resistor R1, the second end of the first switch tube Q1 is connected to the ground, the first end of the first switch tube Q1 is connected to the enabling module 124, and the first switch tube Q1 outputs a first detection signal under the drive of the first level signal.
  • the first switch tube Q1 can be a semiconductor transistor that is turned on at a high level, such as an N-channel MOS tube, an IGBT, etc.
  • the control end, the first end, and the second end of the first switch tube Q1 are the gate, the drain, and the source of the MOS tube, respectively.
  • the voltage Vb of the control end of the first switch tube Q1 presents a certain voltage, which is used to drive the first switch tube Q1 to switch, thereby pulling the voltage Vc of the first end of the first switch tube Q1 down to the ground, that is, outputting the first detection signal to the enabling module 124.
  • This embodiment provides an implementation of a detection module 122, which has the advantages of simple circuit structure, reliability, and low cost.
  • the detection module 122 further includes a first energy storage device C1 and a first unidirectional conductive device D1, wherein the input end of the first unidirectional conductive device D1 is connected to the first detection port 110, and the output end of the first unidirectional conductive device D1 is connected to one end of the first energy storage device C1 and the control end of the first switch tube Q1. The other end of is grounded, and the first energy storage device C1 is used for storing energy based on the first level signal to drive the first switch tube Q1 to turn on.
  • the first energy storage device C1 may be an energy storage capacitor, and the first unidirectional conducting device D1 may be a diode.
  • the first detection signal is, for example, a PWM signal
  • the first energy storage device C1 stores energy and filters it, so that the control end of the first switch tube Q1 can maintain a certain stable level above a certain frequency duty cycle of the PWM signal, so that the first switch tube Q1 can be turned on, output the first detection signal, and trigger the enabling module 124 to output an enabling level of a preset duration.
  • the first unidirectional conductor D1 can prevent the voltage at the control end of the first switch tube Q1 from being pulled down by the input, and fails to provide a first detection signal of sufficient duration, thereby causing the enabling circuit 120 to enable the wake-up chip 200 to fail to start.
  • the first energy storage device C1 is also connected in parallel with a discharge resistor R11.
  • the discharge circuit composed of the first energy storage device C1 and the discharge resistor R11 can maintain the voltage Vb at the control end of the first switch tube Q1 under the input of a certain frequency duty cycle of the PWM signal, thereby turning on the first switch tube Q1 to provide a first detection signal.
  • the detection module 122 further includes a voltage stabilizing device Z1 , which is connected to the control end of the first switch tube Q1 and is used to stabilize the voltage of the control end of the first switch tube Q1 .
  • the voltage stabilizing device Z1 is, for example, a voltage stabilizing diode, whose cathode is connected to the control terminal of the first switch tube Q1 and whose anode is grounded.
  • the voltage stabilizing diode can start working when the voltage input to the control terminal of the first switch tube Q1 is greater than a certain value, and clamp the voltage Vb of the control terminal of the first switch tube Q1 at a certain voltage value to protect the first switch tube Q1 from being damaged.
  • the maximum clamping voltage of the voltage stabilizing device Z1 needs to be less than the withstand voltage from the control terminal to the second terminal of the first switch tube Q1.
  • a current limiting resistor R12 is connected between the cathode of the voltage stabilizing device Z1 and the discharge resistor R11.
  • the current limiting resistor R12 plays a current limiting role in the circuit. When the voltage stabilizing device Z1 is working, the circuit current can be limited to protect the circuit-related components.
  • the BMS wake-up and sleep circuit further includes a second detection port 112 and a second unidirectional conduction device D2, and the second unidirectional conduction device D2 is forwardly connected between the second detection port 112 and the control end of the first switch tube Q1.
  • the second detection port 112 can be used to access other wake-up source level signals or PWM signals, providing another channel for waking up and sleeping the BMS.
  • the second unidirectional conduction device D2 can be a diode, which has a similar function to the first unidirectional conduction device D1 described above.
  • the enabling module 124 includes a second energy storage device C2, a second switch tube Q2, a second resistor R2 and a third resistor R3; one end of the second energy storage device C2 is connected to the output of the detection module 122, the second end of the second energy storage device C2 is connected to the control end of the second switch tube Q2, the first end of the second switch tube Q2 is connected to the second power supply, the second end of the second switch tube Q2 is grounded through the third resistor R3, the second end of the second switch tube Q2 is also connected to the first enable pin EN1 of the wake-up chip 200, and the second resistor R2 is connected between the control end and the second end of the second switch tube Q2; the second switch tube Q2 is turned on based on the first detection signal to output an enable level, and after the second energy storage device C2 is charged for a preset period of time using the first power supply through the second resistor R2 based on the first detection signal, the second switch tube Q2 is turned off to stop outputting the enable
  • the second energy storage device C2 is, for example, a capacitor, and the second switch tube Q2 can be a low-level conductive semiconductor transistor, such as a P-channel MOS tube, IGBT, etc.
  • the control end, the first end, and the second end of the second switch tube Q2 are the gate, source, and drain of the MOS tube respectively.
  • the voltage Vd at the control end of the second switch tube Q2 is pulled down to the ground and turned on by utilizing the principle that the voltage at both ends of the second energy storage device (capacitor) C2 does not change suddenly, thereby outputting the enable level (including high level signal and rising edge signal).
  • the second power supply V2 charges the second energy storage device C2, and the voltage Vd at the control end of the second switch tube Q2 rises to make the second switch tube Q2 turn off to stop outputting the enable level.
  • the process configures a preset duration, which allows the second switch tube Q2 to be opened in a certain time window, thereby outputting an enable level to enable the wake-up chip 200 to start up and wake up the BMS in the dormant state.
  • the enabling module 124 further includes a third unidirectional conducting device D3, which is forwardly connected between the second end of the second switch tube Q2 and the first enabling pin EN1 of the wake-up chip 200.
  • the third unidirectional conducting device D3 may be a diode to prevent the voltage of other wake-up sources such as the controller of the BMS from being connected in series with the first enabling pin EN1 of the wake-up chip 200 and affecting the normal operation of the enabling module 124.
  • the first power source V1 and the second power source V2 may be common power sources on the BMS board, generally 3.3 volts (V) or 5V, or power sources adapted to the level of the system.
  • the control circuit 130 includes one of the control chips in the BMS, and a lock pin of the control chip is connected to a second enable pin EN2 of the wake-up chip 200 to provide a self-locking signal.
  • the enabling circuit 120 and the control circuit 130 are connected to different enabling pins of the wake-up chip 200, so that the control of the wake-up chip 200 by the enabling level and the control of the wake-up chip 200 by the self-locking signal are independent of each other, so that the wake-up chip 200 after startup can be locked by the self-locking signal output by the controller, so that the wake-up chip 200 can be shut down after the self-locking signal is canceled to achieve sleep, thereby reducing the lead-acid consumption of the battery.
  • the wake-up chip 200 is a power chip for supplying power to the BMS, or a control chip for controlling the BMS to sleep or wake up.
  • the wake-up chip 200 is a component in the BMS.
  • the external high-level signal or rising edge signal is enabled through the first enable pin EN1 to start the wake-up chip 200, and then the entire BMS is activated to start working.
  • a power chip with a level and/or rising edge signal wake-up function when receiving an external level signal (such as a high level), outputs the back-end power demand voltage, so that the entire BMS starts working.
  • a control chip with a level and/or rising edge signal wake-up function when receiving an external level signal (such as a high level), outputs a control signal to control the start of the power module, so that the power module outputs the back-end power demand voltage, so that the entire BMS starts working.
  • the BMS sleep and wake-up circuit of the embodiment of the present application is compatible with level-triggered and/or edge-triggered power chips and control chips, so that the level-triggered and/or edge-triggered BMS can also realize the access wake-up and sleep of the charging device 10.
  • control circuit 130 and the wake-up chip 200 are the same control chip.
  • the control chip receives the enable level of the preset time length through the first enable pin EN1 and is enabled, it generates a self-locking signal to the second enable pin EN2 to maintain the working state. After the preset time length, the self-locking signal can be cancelled to turn off the wake-up chip 200 to sleep the BMS.
  • the BMS sleep wake-up circuit further includes a sampling circuit 140 connected to the first detection port 110 and the control circuit 130 , and the sampling circuit 140 is configured to output a pull-out signal when it is detected that the detection port 110 is not connected to the charging device 10 .
  • the sampling circuit 140 can also be connected to the second detection port 112.
  • the sampling circuit 140 detects the access signal of the connected charging gun (such as the AC_CP interface) and identifies the level or PWM state for identification of the wake-up source (such as the charging gun) or the charging state.
  • the unplug signal can be a level signal, which is not limited here.
  • the control circuit 130 can cancel the self-locking signal according to the unplug signal, thereby turning off the wake-up chip 200 and hibernating the BMS.
  • the charging gun is connected, that is, the AC_CP interface is connected as shown in Figure 1.
  • the first switch tube Q1 is turned on (Vb>Vgsth of Q1), and the Vc voltage is pulled down to 0V.
  • Vd Since the voltage across the capacitor of the second energy storage device C2 cannot change suddenly (capacitor characteristics ), Vd will also be pulled down to 0V (Vd to V2 recovery time, i.e., the charging time of capacitor C2 through the third resistor R3), at this time, Vd-e will present a certain voltage to turn on the second switch tube Q2 (Vd-Ve ⁇ Vgsth of Q2), at this time, Vg rises from a low level to a high level, i.e., the first enable pin EN1 of the corresponding wake-up chip 200 changes from low to high, triggering the level or edge wake-up function of the wake-up chip 200, activating the BMS in the dormant state to start working, and the control circuit 130 (such as MCU) that starts working outputs a self-locking signal to maintain the start-up of the wake-up chip 200 to keep the BMS in the awake state.
  • Vd-Ve Vg rises from a low level to a high level,
  • FIG. 4 is a flow chart of a BMS sleep wake-up method provided in some embodiments of the present application, and is combined with FIG. 1 to FIG. 3.
  • the present application embodiment provides a BMS sleep wake-up method, including:
  • Step S110 when a charging device is connected, generating an enable level of a preset duration according to a first level signal provided by the charging device to enable a wake-up chip of the BMS to start up to wake up the BMS;
  • Step S120 generating a self-locking signal within the preset time period to maintain the wake-up chip in a startup state
  • Step S130 if a sleep signal is received, stop outputting the self-locking signal to turn off the wake-up chip, so that the BMS enters sleep mode;
  • the BMS when the charging device 10 is connected, the BMS can generate an enable level through the first level signal provided by the charging device 10 to enable the wake-up chip 200 to start and wake up the BMS in the dormant state, and output a self-locking signal to keep the wake-up chip 200 awake on the BMS; in addition, when the charging device 10 remains unplugged, after a preset period of time, the wake-up chip 200 is turned off after the self-locking signal is canceled, so that the BMS can enter the dormant state, solving the problem in the related art that the BMS cannot enter the dormant state if the charging device 10 is not unplugged.
  • the generated enable level will generate an edge signal, whether it is an edge-triggered or level-triggered wake-up chip 200, it can satisfy the requirement of being able to put the BMS into dormant state while keeping the charging device 10 connected, thereby reducing the lead-acid consumption of the battery.
  • the first level signal includes a high level signal and a PWM signal.
  • the BMS is compatible with level triggering and/or edge triggering, so that the level triggered and/or edge triggered BMS can also realize the access wake-up and sleep of the charging device 10.
  • the present application provides a BMS including the above-mentioned BMS sleep wake-up circuit.
  • the BMS when the charging device 10 is connected, the BMS can generate an enable level of a preset duration through the level signal provided by the charging device 10, so as to enable the wake-up chip 200 to start up to wake up the BMS in the dormant state, and the awakened BMS keeps the wake-up chip 200 started by outputting a self-locking signal; in addition, when the charging device 10 remains unplugged, the BMS can enter the dormant state after the self-locking signal is canceled, which solves the problem that the BMS cannot enter the dormant state if the charging device 10 is not unplugged, thereby reducing the lead-acid consumption of the battery.
  • the present application provides an electrical device, including a battery and the above-mentioned BMS.
  • the electric device may be a new energy electric vehicle, a cleaning robot, an energy storage device, etc.
  • the level signal provided by the charging device 10 can generate an enable level of a preset duration, so as to enable the wake-up chip 200 to start up to wake up the BMS of the electric device, and the awakened BMS keeps the wake-up chip 200 started by outputting a self-locking signal; in addition, when the charging device 10 remains unplugged, the BMS can enter sleep mode after the self-locking signal is canceled, which solves the problem that the BMS cannot enter sleep mode if the charging device 10 is not unplugged, thereby reducing the lead-acid consumption of the battery.

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Abstract

一种BMS休眠唤醒电路、方法、BMS和用电设备。BMS休眠唤醒电路设置使能电路(120)在充电设备(10)接入时，可以产生预设时长的使能电平使能唤醒芯片(200)启动以唤醒休眠状态的BMS，且通过控制电路(130)输出自锁信号使得唤醒芯片(200)对BMS保持唤醒；另外，在充电设备(10)保持不拔出的情况下，撤销掉自锁信号后唤醒芯片(200)则关闭，使得BMS即可以进入休眠状态，解决了充电设备(10)不拔出则BMS无法进入休眠状态的问题。

Description

BMS休眠唤醒电路、方法、BMS和用电设备
本申请要求于2022年10月24日在中华人民共和国国家知识产权局提交的、申请号为202211302306.3、发明名称为“BMS休眠唤醒电路、方法、BMS和用电设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池管理领域，具体涉及一种BMS休眠唤醒电路、方法、BMS和用电设备。
背景技术
新能源电动车产品上，充电是必不可少的功能，针对国标充电枪为高电平输入的充电接口上(如交流充电枪的AC_CP接口)，整车设计要求充电枪插入整车后需能唤醒电池管理系统(Battery Management System，BMS)，工程师在进行设计时，重点放在了插枪唤醒功能上，很多时候会忽略掉在保持充电枪不拔出的情况也需支持BMS能够进入休眠，此时在充电完成或停止但未拔出充电枪的情况下，BMS也就没法进入休眠，从而增加了整车铅酸的电消耗。
申请内容
鉴于上述问题，本申请实施例提供一种BMS休眠唤醒电路、方法、BMS和用电设备，能够解决充电枪充电设备不拔出BMS没法进入休眠的问题。
第一方面，本申请实施例提供了一种BMS休眠唤醒电路，包括：
第一检测端口，用于在充电设备接入时连接到所述充电设备的通讯接口；
使能电路，与第一检测端口和BMS的唤醒芯片连接，用于在充电设备接入时，根据充电设备提供的第一电平信号产生预设时长的使能电平使能唤醒芯片启动以唤醒休眠状态的BMS；
控制电路，用于在BMS被唤醒后，输出自锁信号到唤醒芯片以维持唤醒芯片在启动状态，还用于在接收到休眠信号时，停止输出自锁信号以关闭唤醒芯片，使BMS进入休眠状态。
本申请实施例的技术方案中，设置使能电路在充电设备接入时，根据充电设备的通讯接口提供的第一电平信号产生预设时长的使能电平，预设时长的使能电平使能唤醒芯片启动以唤醒休眠状态的BMS(即启动)，且通过控制电路输出自锁信号使得唤醒芯片对BMS保持唤醒；另外，在充电设备保持不拔出的情况下，由于使能电平只维持预设时长，之后需要休眠时撤销掉自锁信号后唤醒芯片则关闭，使得BMS即可以进入休眠状态，解决了相关技术中充电设备不拔出BMS则无法进入休眠状态的问题；另外，由于产生的使能电平必定会产生边沿信号，因此无论是边沿触发还是电平触发的唤醒芯片都能满足在保持充电设备接入时，能够休眠BMS，从而降低电池的铅酸消耗。
在一些实施例中，使能电路包括：
检测模块，与第一检测端口连接，用于根据充电设备提供的第一电平信号输出第一检测信号；
使能模块，与检测模块连接，用于根据第一检测信号产生预设时长的使能电平并输出。
本申请实施例的技术方案中，提供了一种使能电路的实施例，通过检测模块检测充电设备提供的第一电平信号，使能模块根据第一电平信号产生预设时长的使能电平启动唤醒 芯片，以唤醒休眠状态的BMS，电路简单，可靠。
在一些实施例中，检测模块包括第一开关管和第一电阻，第一开关管的控制端连接到第一检测端口，第一开关管的第一端通过第一电阻连接到第一电源，第一开关管的第二端连接地，第一开关管的第一端连接到使能模块，第一开关管在第一电平信号的驱动下输出第一检测信号。
本申请实施例的技术方案中，提供了一种检测模块的实施方式，第一电平信号例如是高电平信号，第一检测信号例如是低电平信号，电路结构简单可靠，也成本低。
在一些实施例中，检测模块还包括第一储能器件和第一单向导通器件，第一单向导通器件的输入端连接到第一检测端口，第一单向导通器件的输出端连接到第一储能器件的一端和第一开关管的控制端，第一储能器件的另一端接地，第一储能器件用于基于第一电平信号存储能量以驱动第一开关管导通。
本申请实施例的技术方案中，提供了一种使能模块的实施方式，第一检测信号例如是PWM信号的情况下，通过第一储能器件储能滤波，能在PWM信号一定频率占空比以上维持第一开关管的控制端可以保持一定的稳定电平，使得第一开关管能够导通，输出第一检测信号；另外，在PWM信号低电平阶段，第一单向导通器件可以阻止第一开关管的控制端的电压被输入拉低，未能提供足够时长的第一检测信号，从而导致使能电路使能唤醒芯片启动失败。
在一些实施例中，检测模块还包括稳压器件，稳压器件连接在第一开关管的控制端，用于稳定第一开关管的控制端的电压。
本申请实施例的技术方案中，当可以使得输入到第一开关管的控制端的电压大于一定值时开始工作，将第一开关管的控制端的电压钳位在一定电压值，以保护第一开关管不被损坏，稳压器件选型的最大钳位电压需小于第一开关管的控制端到第二端的耐压。
在一些实施例中，还包括第二检测端口和第二单向导通器件，第二单向导通器件正向连接在第二检测端口和第一开关管的控制端之间。
本申请实施例的技术方案中，第二检测端口可以用于接入电平信号或PWM信号，提供了另一种唤醒、休眠BMS的通道，第二单向导通器件与上述第一单向导通器件的作用类同。
在一些实施例中，使能模块包括第二储能器件、第二开关管、第二电阻以及第三电阻；
第二储能器件的一端连接到检测模块的输出，第二储能器件的第二端连接到第二开关管的控制端，第二开关管的第一端连接到第二电源，第二开关管的第二端通过第三电阻接地，第二开关管的第二端还连接到唤醒芯片的第一使能引脚，第二电阻连接在第二开关管的控制端和第二端之间；
第二开关管基于第一检测信号导通以输出使能电平，且第二储能器件基于第一检测信号利用第一电源通过第一电阻充电预设时长后，关断第二开关管以停止输出使能电平。
本申请实施例的技术方案中，当第一开关管导通时，利用第二储能器件，比如电容器两端电压不突变原理，使得第二开关管的控制端呈现低电平而导通从而输出使能电平，同时第二电源给第二储能器件充电，电压上升至使得第二开关管关断以停止输出使能电平，通过给第二储能器件的充电过程配置预设时长，可以让第二开关管有一定时间窗口打开，从而输出使能电平使能唤醒芯片启动，唤醒休眠状态的BMS。
在一些实施例中，使能模块还包括第三单向导通器件，第三单向导通器件正向连接在 第二开关管的第二端和唤醒芯片的第一使能引脚之间。避免同用唤醒芯片的第一使能引脚的其他唤醒源电压的串入影响使能模块的正常工作。
在一些实施例中，控制电路包括BMS中的其中一个控制芯片，控制芯片的自锁引脚连接到唤醒芯片的第二使能引脚，以提供自锁信号。
本申请实施例的技术方案中，使能电路与控制电路连接到唤醒芯片的不同管脚，使得使能电平对唤醒芯片和自锁信号对唤醒芯片的控制相互独立，以此能够在撤销自锁信号之后实现唤醒芯片的关闭，以实现休眠，从而降低电池的铅酸消耗。
在一些实施例中，唤醒芯片为用于给BMS供电的电源芯片，或用于控制BMS休眠或唤醒的控制芯片。
在一些实施例中，第一电平信号包括高电平信号和PWM信号。
能够兼容电平触发和/或边沿触发的电源芯片和控制芯片，使得电平触发和/或边沿触发的BMS也能够实现充电设备接入唤醒和休眠。
在一些实施例中，控制电路包括BMS中的其中一个控制芯片。以便于系统的设置。
第二方面，本申请实施例提供了一种BMS休眠唤醒方法，包括：
在充电设备接入时，根据充电设备提供的第一电平信号产生预设时长的使能电平使能BMS的唤醒芯片启动以唤醒BMS；
在预设时长的时间内产生自锁信号以维持唤醒芯片在启动状态；
若接收到休眠信号，则停止输出自锁信号以关闭唤醒芯片，使BMS进入休眠。
本申请实施例的技术方案中，BMS在充电设备接入时，可以通过充电设备提供的第一电平信号产生预设时长的使能电平，预设时长的使能电平使能唤醒芯片启动以唤醒BMS，并通过输出自锁信号使得唤醒芯片对BMS保持唤醒；另外，在充电设备保持不拔出的情况下，由于使能电平只维持预设时长，之后需要休眠时撤销掉自锁信号后唤醒芯片则关闭，使得BMS即可以进入休眠，解决了相关技术中充电设备不拔出BMS则无法进入休眠状态的问题；并且，由于产生的使能电平会产生边沿信号，因此无论是边沿触发还是电平触发的唤醒芯片都能满足在保持充电设备接入时，能够休眠BMS，从而降低电池的铅酸消耗。
在一些实施例中，第一电平信号包括高电平信号和PWM信号。
本申请实施例的技术方案中，BMS能够兼容电平触发和/或边沿触发，使得电平触发和/或边沿触发的BMS也能够实现充电设备接入唤醒和休眠。
第三方面，本申请实施例提供了一种BMS，包括上述的BMS休眠唤醒电路。
本申请实施例的技术方案中，BMS在充电设备接入时，可以通过充电设备提供的电平信号使能一段时间唤醒芯片启动以唤醒休眠状态的BMS，并且唤醒后的BMS通过输出自锁信号保持唤醒芯片启动；另外，在充电设备保持不拔出的情况下，由于使能电平只维持预设时长，之后需要休眠时撤销掉自锁信号后BMS即可以进入休眠状态，解决了充电设备不拔出BMS则无法进入休眠状态的问题，从而降低电池的铅酸消耗。
第四方面，本申请实施例提供了一种用电设备，包括电池以及上述的BMS。
本申请实施例的技术方案中，用电设备在充电设备接入时，可以通过充电设备提供的电平信号使能一段时间唤醒芯片启动以唤醒用电设备的休眠状态的BMS，并且唤醒后的BMS通过输出自锁信号保持唤醒芯片启动；另外，在充电设备保持不拔出的情况下，由于使能电平只维持预设时长，之后需要休眠时撤销掉自锁信号后BMS即可以进入休眠状态，解决了充电设备不拔出BMS则无法进入休眠状态的问题，从而降低电池的铅酸消耗。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
通过阅读对下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在全部附图中，用相同的附图标号表示相同的部件。在附图中：
图1为本申请一些实施例提供的BMS休眠唤醒电路的模块图；
图2为本申请一些实施例提供的BMS休眠唤醒电路的模块图；
图3为本申请一些实施例提供的BMS休眠唤醒电路的电路图；
图4为本申请一些实施例提供的BMS休眠唤醒方法的流程图；
具体实施方式中的附图标号如下：
充电设备10，通讯接口11，第一检测端口110，第二检测端口112，使能电路120，检测模块122，使能模块124，控制电路130，采样电路140，唤醒芯片200；
第一开关管Q1，第二开关管Q2，第一储能器件C1，第二储能器件C2，第一电阻R1，第二电阻R2，第三电阻R3，泄放电阻R11，限流电阻R12，第一使能引脚EN1，第二使能引脚EN2，第一单向导通器D1，第二单向导通器件D2，第三单向导通器件D3，稳压器件Z1，第一电源V1，第二电源V2。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述 本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
充电唤醒功能，往往配合使用的是唤醒芯片的边沿有效唤醒功能，但目前存在很多应用芯片不支持边沿唤醒。基于此，本申请发明构思在于让充电唤醒功能使用到的唤醒芯片具备基础的电平唤醒功能即可，当然也可以兼容边沿有效唤醒功能。具体地，本申请实施例主要介绍一种针对充电装置(比如充电枪)接口为高电平或脉宽调制(Pulse Width Modulation，PWM)信号输入的BMS接口电路的发明构思，支持接入唤醒，同时也支持不拔出下休眠。使用到的唤醒芯片(如电源芯片，或其他具备唤醒功能的芯片)的唤醒通道具备电平或边沿唤醒功能即可。
比如在新能源电动车产品上，支持充电枪接口输入为高电平的通讯接口(如AC_CP接口，提供电力传输信号)充电枪口插枪唤醒，同样也支持在BMS的控制下，在充电枪保持插枪状态的情况下实现不拔枪休眠，使得在充电完成或停止后，BMS可以进入休眠，节省能耗，降低整车铅酸的损耗。
请参阅图1，图1为本申请一些实施例提供的BMS休眠唤醒电路的模块图。BMS休眠唤醒电路包括第一检测端口110、使能电路120和控制电路130。
第一检测端口110用于在充电设备10接入时连接到充电设备10的通讯接口11；使能电路120与第一检测端口110和BMS的唤醒芯片200连接，根据充电设备10提供的第一电平信号产生预设时长的使能电平使能唤醒芯片200启动以休眠状态的唤醒BMS；控制电路130用于在BMS被唤醒后，输出自锁信号到唤醒芯片200以维持唤醒芯片200在启动状态，还用于在接收到休眠信号时，停止输出自锁信号以关闭唤醒芯片200，使BMS进入休眠状态，解决了相关技术中充电设备10在不拔出BMS则无法进入休眠状态的问题，降低了电池的铅酸消耗。
充电设备10比如是充电枪，或者是市面上的一般充电适配器。充电设备10的通讯接口11比如是充电枪的AC_CP接口，或者充电适配器的通讯接口。以充电枪为例，在将充电枪与充电接口连接之后，通过通讯接口11(即AC_CP接口)向充电接口输出的电力传输信号首先进入充电枪连接阶段，并且在该阶段出现第一个上升沿，并维持高电平的预设时长后，电力传输信号进入数据通讯的脉冲变化(即PWM信号)阶段，脉冲变化阶段充电枪给充电接口输出充电功率，充电完毕后，电力传输信号恢复为高电平。
可以理解，在充电枪接入状态时，第一检测端口110连接到充电设备10的通讯接口11，接收充电设备10的通讯接口11提供的第一电平信号，比如是高电平或PWM信号。相反，在充电设备10未接入状态，第一检测端口110为低电平，也可以成为第二电平信号。
可以理解的是，产生使能电平必定会产生边沿信号。比如，使能电路120根据第一电平信号所产生的预设时长的使能电平为高电平，必定也包括一个上升沿和一个下降沿。那么，BMS的唤醒芯片200是可以高电平有效的使能启动，也可以是上升沿有效的使能启动。控制电路130是BMS中的一部分，当休眠状态的BMS被唤醒后，控制电路130则被启动。 因此，唤醒芯片200启动之后将唤醒休眠状态的BMS，通过控制电路130输出维持唤醒芯片200在启动状态的自锁信号，使得唤醒芯片200始终唤醒BMS以工作，如此完成了休眠状态的BMS的唤醒过程。可以理解的是，要维持唤醒芯片200在启动状态，自锁信号应在预设时长内产生。
此后，经过预设时长后，比如充电完毕后中止时，若想降低电池的铅酸消耗，由于使能电平已停止输出，则可以直接通过停止自锁信号的输出，让唤醒芯片200关闭，让BMS进入休眠状态。这种BMS唤醒、休眠控制方式，可以适用于电平和/或边缘触发的唤醒芯片200。
使能电路120通过检测第一电平信号来确定在充电设备10接入，充电设备10接入时输出预设时长的使能电平使能唤醒芯片200启动以唤醒休眠状态的BMS，且通过控制电路130输出自锁信号使得唤醒芯片200对BMS保持唤醒；另外，在充电设备10保持不拔出的情况下，由于使能电平只维持预设时长，之后需要休眠时撤销掉自锁信号后唤醒芯片200则关闭，使得BMS即可以进入休眠状态，解决了充电设备10不拔出BMS则无法进入休眠的问题。并且，由于产生的使能电平必定会产生边沿信号，因此无论是边沿触发还是电平触发的唤醒芯片200都能满足在保持充电设备10接入时，能够休眠BMS，从而降低电池的铅酸消耗。
在一些实施例中，请参阅图2，图2为本申请一些实施例提供的BMS休眠唤醒电路的模块图。
使能电路120包括检测模块122和使能模块124。检测模块122与第一检测端口110连接，用于根据充电设备10提供的第一电平信号输出第一检测信号；使能模块124与检测模块122连接，用于根据第一检测信号产生预设时长的使能电平。使能电平用于输出到BMS的唤醒芯片200使能唤醒芯片200启动，以唤醒BMS。
可以理解的是，在充电枪拔出时，检测模块122还用于检测到第二电平信号(低电平)输出第二检测信号(高电平)，使能模块124还用于接收第二检测信号停止输出使能电平(高电平或上升沿)，此时输出低电平，对于高电平或上升沿有效的唤醒芯片200，低电平不能使能启动唤醒信号。该电路设计简单，可靠。
在一些实施例中，请参阅图3，图3为本申请一些实施例提供的BMS休眠唤醒电路的电路图。检测模块122包括第一开关管Q1和第一电阻R1，第一开关管Q1的控制端连接到第一检测端口110，第一开关管Q1的第一端通过第一电阻R1连接到第一电源V1，第一开关管Q1的第二端连接地，第一开关管Q1的第一端连接到使能模块124，第一开关管Q1在第一电平信号的驱动下输出第一检测信号。
示例性的，第一开关管Q1可以是高电平导通的半导体晶体管，比如N沟道MOS管，IGBT等。第一开关管Q1的控制端、第一端、第二端分别为MOS管的栅极、漏极、源极。在第一检测端口110的输入第一电平信号(比如高电平信号)下，使得第一开关管Q1的控制端的电压Vb呈现一定电压，用于驱动第一开关管Q1开关管动作，从而将第一开关管Q1的第一端的电压Vc拉低到地，即输出第一检测信号到使能模块124。本实施例提供了一种检测模块122的实施方式，具有电路结构简单，可靠，成本较低的优点。
在一些实施例中，请参阅图3，检测模块122还包括第一储能器件C1和第一单向导通器件D1，第一单向导通器件D1的输入端连接到第一检测端口110，第一单向导通器件D1的输出端连接到第一储能器件C1的一端和第一开关管Q1的控制端，第一储能器件C1 的另一端接地，第一储能器件C1用于基于第一电平信号存储能量以驱动第一开关管Q1导通。
示例性的，第一储能器件C1可以是储能电容，第一单向导通器件D1可以是二极管。第一检测信号例如是PWM信号的情况下，通过第一储能器件C1储能滤波，能在PWM信号一定频率占空比以上维持第一开关管Q1的控制端可以保持一定的稳定电平，使得第一开关管Q1能够导通，输出第一检测信号，触发使能模块124输出预设时长的使能电平。
另外，在PWM信号低电平阶段，第一单向导通器D1可以阻止第一开关管Q1的控制端的电压被输入拉低，未能提供足够时长的第一检测信号，从而导致使能电路120使能唤醒芯片200启动失败。
在一些实施例中，第一储能器件C1还并联有一个泄放电阻R11，第一储能器件C1、泄放电阻R11组成的泄放回路可以让第一开关管Q1的控制端的电压Vb在PWM信号的一定频率占空比的输入得到保持，从而能够导通第一开关管Q1以提供第一检测信号。
在一些实施例中，请参阅图3，检测模块122还包括稳压器件Z1，稳压器件Z1连接在第一开关管Q1的控制端，用于稳定第一开关管Q1的控制端的电压。
稳压器件Z1比如采用稳压二极管，其阴极连接到第一开关管Q1的控制端，阳极接地。稳压二极管可以使得输入到第一开关管Q1的控制端的电压大于一定值时开始工作，将第一开关管Q1的控制端的电压Vb钳位在一定电压值，以保护第一开关管Q1不被损坏，稳压器件Z1选型的最大钳位电压需小于第一开关管Q1的控制端到第二端的耐压。
在一些实施例中，稳压器件Z1的阴极与泄放电阻R11之间连接有限流电阻R12，限流电阻R12在该回路中起到限流作用，当稳压器件Z1工作时间，可以限制回路电流，保护回路相关元器件。
在一些实施例中，BMS唤醒休眠电路还包括第二检测端口112和第二单向导通器件D2，第二单向导通器件D2正向连接在第二检测端口112和第一开关管Q1的控制端之间。第二检测端口112可以用于接入其他唤醒源电平信号或PWM信号，提供了另一种唤醒、休眠BMS的通道，第二单向导通器件D2可以是二极管，与上述第一单向导通器件D1的作用类同。
在一些实施例中，使能模块124包括第二储能器件C2、第二开关管Q2、第二电阻R2以及第三电阻R3；第二储能器件C2的一端连接到检测模块122的输出，第二储能器件C2的第二端连接到第二开关管Q2的控制端，第二开关管Q2的第一端连接到第二电源，第二开关管Q2的第二端通过第三电阻R3接地，第二开关管Q2的第二端还连接到唤醒芯片200的第一使能引脚EN1，第二电阻R2连接在第二开关管Q2的控制端和第二端之间；第二开关管Q2基于第一检测信号导通以输出使能电平，且第二储能器件C2基于第一检测信号利用第一电源通过第二电阻R2充电预设时长后，关断第二开关管Q2以停止输出使能电平。
第二储能器件C2比如采用电容器，第二开关管Q2可以是低电平导通的半导体晶体管，比如P沟道MOS管，IGBT等。第二开关管Q2的控制端、第一端、第二端分别为MOS管的栅极、源极、漏极。
当第一开关管Q1导通时，利用第二储能器件(电容)C2两端电压不突变原理，将第二开关管Q2的控制端的电压Vd拉低到地而导通从而输出使能电平(包含高电平信号和上升沿信号)，同时第二电源V2给第二储能器件C2充电，第二开关管Q2的控制端的电压Vd上升至使得第二开关管Q2关断以停止输出使能电平，通过给第二储能器件C2的充电 过程配置预设时长，可以让第二开关管Q2有一定时间窗口打开，从而输出使能电平使能唤醒芯片200启动，唤醒休眠状态的BMS。
在一些实施例中，使能模块124还包括第三单向导通器件D3，第三单向导通器件D3正向连接在第二开关管Q2的第二端和唤醒芯片200的第一使能引脚EN1之间。第三单向导通器件D3可以是二极管，避免同用唤醒芯片200的第一使能引脚EN1的其他唤醒源比如BMS的控制器的电压的串入影响使能模块124的正常工作。
第一电源V1和第二电源V2，可以为BMS板上的常用电源，一般为3.3伏特(V)或者5V，或者适配该系统的电平电源。
在一些实施例中，请参阅图3，控制电路130包括BMS中的其中一个控制芯片，控制芯片的锁定引脚连接到唤醒芯片200的第二使能引脚EN2，以提供自锁信号。
使能电路120与控制电路130连接到唤醒芯片200的不同使能管脚，使得使能电平对唤醒芯片200和自锁信号对唤醒芯片200的控制相互独立，使得启动后的唤醒芯片200能被控制器输出的自锁信号锁定，以此能够在撤销自锁信号之后实现唤醒芯片200的关闭，以实现休眠，从而降低电池的铅酸消耗。
在一些实施例中，唤醒芯片200为用于给BMS供电的电源芯片，或用于控制BMS休眠或唤醒的控制芯片。
可以理解，唤醒芯片200为BMS中的一个部件，外部输入的高电平信号或上升沿信号通过第一使能引脚EN1使能启动该唤醒芯片200，继而激活整个BMS开始工作。如具备电平和/或上升沿信号唤醒功能的电源芯片，当接收到外部电平信号(比如高电平)，输出后端用电需求电压，从而让整个BMS开始工作。如具备电平和/或上升沿信号唤醒功能的控制芯片，当接收到外部电平信号(比如高电平)，输出控制电源模块启动的控制信号，让电源模块输出后端用电需求电压，从而让整个BMS开始工作。
本申请实施例的BMS休眠唤醒电路能够兼容电平触发和/或边沿触发的电源芯片和控制芯片，使得电平触发和/或边沿触发的BMS也能够实现充电设备10接入唤醒和休眠。
在一些实施例中，控制电路130与唤醒芯片200为同一个控制芯片。在工作过程中，该控制芯片通过第一使能引脚EN1接收预设时长的使能电平被使能启动后，自身产生一个自锁信号给第二使能引脚EN2以维持在工作状态。并在预设时长之后，撤销掉自锁信号即可以让唤醒芯片200关闭，以休眠BMS。
在一些实施例中，请参阅图3，BMS休眠唤醒电路还包括采样电路140连接到第一检测端口110和控制电路130，采样电路140用于在检测到检测端口110未与充电设备10连接时，输出拔出信号。
在一些实施例中，采样电路140还可以连接到第二检测端口112。采样电路140是对接入的充电枪接入信号(如AC_CP接口)进行检测，识别电平或PWM状态，用于唤醒源(比如充电枪)的识别或充电状态的识别。拔出信号可以是一个电平信号，在此不做限定。控制电路130可以根据拔出信号撤销自锁信号，从而关闭唤醒芯片200，休眠BMS。
在一些实施例中，请参阅图3，充电设备10未接入状态，即附图1中例举的AC_CP接口未接入，此时Va＝Vb＝0V(即Vb＜Q1的栅源阈值电压Vgsth)，第一开关管Q1处截止不导通状态，第二储能器件C2之电容两端的电压稳定，Vd＝Ve＝V2，第二开关管Q2处截止不导通状态(即Vd-Ve＞Q2的Vgsth)，此时Vg为低电平，休眠状态的BMS未被唤醒激活。
充电枪接入状态，即附图1中例举的AC_CP接口接入，由于充电接口高电平(或PWM信号)的接入，使得Vb＝Va由低电平变为高电平(由于第一单向导通器件D1对反向电流的截止，配合大容值第一储能器件C1，大阻值泄放电阻R11的缓慢电压泄放下，在一定频率的PWM信号输入下，也能保持Va处于高电平)，此时第一开关管Q1导通(Vb＞Q1的Vgsth)，Vc电压被拉低到0V，由于第二储能器件C2的电容两端电压不能突变(电容特性)，Vd也会被拉低到0V(Vd到V2恢复时间即电容C2通过第三电阻R3的充电时间)，此时Vd-e就会呈现一定电压使得第二开关管Q2导通(Vd-Ve＜Q2的Vgsth)，此时Vg由低电平上升为高电平，即对应的唤醒芯片200的第一使能引脚EN1由低变高，触发唤醒芯片200的电平或边沿唤醒功能，激活休眠状态的BMS开始工作，开始工作的控制电路130(如MCU)输出自锁信号，维持唤醒芯片200启动以保持BMS处在唤醒状态。
在保持充电枪接入状态，由于会第一开关管Q1一直处于导通状态，此时第二储能器件C2的电容两端的电压也会恢复到稳定状态，Vd电压恢复，即Vd＝Ve＝V2，第二开关管Q2也恢复到截止不导通状态(即Vd-Ve＞Q2的Vgsth)，Vg为低电平，此时控制电路130取消输出的自锁信号，便可以让BMS进入休眠状态。
自此，完成一个针对外部输入为高电平或PWM信号的充电接口的唤醒、休眠功能工作流程。
第二方面，请参阅图4，图4为本申请一些实施例提供的BMS休眠唤醒方法的流程图，并结合图1至图3。本申请实施例提供了一种BMS休眠唤醒方法，包括：
步骤S110，在充电设备接入时，根据所述充电设备提供的第一电平信号产生预设时长的使能电平使能BMS的唤醒芯片启动以唤醒BMS；
步骤S120，在所述预设时长的时间内产生自锁信号以维持所述唤醒芯片在启动状态；
步骤S130，若接收到休眠信号，则停止输出所述自锁信号以关闭所述唤醒芯片，使所述BMS进入休眠；
本申请实施例的技术方案中，BMS在充电设备10接入时，可以通过充电设备10提供的第一电平信号产生使能电平使能唤醒芯片200启动以唤醒休眠状态的BMS，并通过输出自锁信号使得唤醒芯片200对BMS保持唤醒；另外，在充电设备10保持不拔出的情况下，在预设时长之后，撤销掉自锁信号后唤醒芯片200则关闭，使得BMS即可以进入休眠状态，解决了相关技术中充电设备10不拔出BMS则无法进入休眠状态的问题。并且，由于产生的使能电平会产生边沿信号，因此无论是边沿触发还是电平触发的唤醒芯片200都能满足在保持充电设备10接入时，能够休眠BMS，从而降低电池的铅酸消耗。
在一些实施例中，第一电平信号包括高电平信号和PWM信号。
本申请实施例的技术方案中，BMS能够兼容电平触发和/或边沿触发，使得电平触发和/或边沿触发的BMS也能够实现充电设备10接入唤醒和休眠。
第三方面，请参阅图3，本申请提供了一种BMS，包括上述的BMS休眠唤醒电路。
本申请实施例的技术方案中，BMS在充电设备10接入时，可以通过充电设备10提供的电平信号产生预设时长的使能电平，以使能唤醒芯片200启动以唤醒休眠状态的BMS，并且唤醒后的BMS通过输出自锁信号保持唤醒芯片200启动；另外，在充电设备10保持不拔出的情况下，撤销掉自锁信号后BMS即可以进入休眠状态，解决了充电设备10不拔出BMS则无法进入休眠状态的问题，从而降低电池的铅酸消耗。
第四方面，本申请提供了一种用电设备，包括电池以及上述的BMS。
用电设备可以是新能源电动车，清洁机器人，储能设备等。本申请实施例的技术方案中，用电设备在充电设备10接入时，可以通过充电设备10提供的电平信号产生预设时长的使能电平，以使能唤醒芯片200启动以唤醒用电设备的BMS，并且唤醒后的BMS通过输出自锁信号保持唤醒芯片200启动；另外，充电设备10保持不拔出的情况下，撤销掉自锁信号后BMS即可以进入休眠，解决了充电设备10不拔出BMS则无法进入休眠状态的问题，从而降低电池的铅酸消耗。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (16)

  1. 一种BMS休眠唤醒电路，其中，包括：
    第一检测端口，用于在充电设备接入时连接到所述充电设备的通讯接口；
    使能电路，与所述第一检测端口和BMS的唤醒芯片连接，用于在充电设备接入时，根据所述充电设备提供的第一电平信号产生预设时长的使能电平使能所述唤醒芯片启动以唤醒休眠状态的所述BMS；
    控制电路，用于在所述BMS被唤醒后，输出自锁信号到所述唤醒芯片以维持所述唤醒芯片在启动状态，还用于在接收到休眠信号时，停止输出所述自锁信号以关闭所述唤醒芯片，使所述BMS进入休眠状态。
  2. 如权利要求1所述的BMS休眠唤醒电路，其中，所述使能电路包括：
    检测模块，与所述第一检测端口连接，用于根据所述充电设备提供的第一电平信号输出第一检测信号；
    使能模块，与所述检测模块连接，用于根据所述第一检测信号产生预设时长的使能电平并输出。
  3. 如权利要求2所述的BMS休眠唤醒电路，其中，所述检测模块包括第一开关管和第一电阻，所述第一开关管的控制端连接到所述第一检测端口，所述第一开关管的第一端通过所述第一电阻连接到第一电源，所述第一开关管的第二端连接地，所述第一开关管的第一端连接到所述使能模块，所述第一开关管在所述第一电平信号的驱动下输出所述第一检测信号。
  4. 如权利要求3所述的BMS休眠唤醒电路，其中，所述检测模块还包括第一储能器件和第一单向导通器件，所述第一单向导通器件的输入端连接到所述第一检测端口，所述第一单向导通器件的输出端连接到所述第一储能器件的一端和所述第一开关管的控制端，所述第一储能器件的另一端接地，所述第一储能器件用于基于所述第一电平信号存储能量以驱动所述第一开关管导通。
  5. 如权利要求3所述的BMS休眠唤醒电路，其中，所述检测模块还包括稳压器件，所述稳压器件连接在所述第一开关管的控制端，用于稳定所述第一开关管的控制端的电压。
  6. 如权利要求4所述的BMS休眠唤醒电路，其中，还包括第二检测端口和第二单向导通器件，所述第二单向导通器件正向连接在所述第二检测端口和所述第一开关管的控制端之间。
  7. 如权利要求2至6任一项所述的BMS休眠唤醒电路，其中，所述使能模块包括第二储能器件、第二开关管、第二电阻以及第三电阻；
    所述第二储能器件的一端连接到所述检测模块的输出，所述第二储能器件的第二端连接到所述第二开关管的控制端，所述第二开关管的第一端连接到第二电源，所述第二开关管的第二端通过所述第三电阻接地，所述第二开关管的第二端还连接到所述唤醒芯片的第一使能引脚，所述第二电阻连接在所述第二开关管的控制端和第二端之间；
    所述第二开关管基于所述第一检测信号导通以输出所述使能电平，且所述第二储能器件基于所述第一检测信号利用所述第一电源通过所述第二电阻充电预设时长后，关断所述第二开关管以停止输出所述使能电平。
  8. 如权利要求7所述的BMS休眠唤醒电路，其中，所述使能模块还包括第三单向导 通器件，所述第三单向导通器件正向连接在所述第二开关管的第二端和所述唤醒芯片的第一使能引脚之间。
  9. 如权利要求7所述的BMS休眠唤醒电路，其中，所述控制电路包括所述BMS中的其中一个控制芯片，所述控制芯片的自锁引脚连接到所述唤醒芯片的第二使能引脚，以提供所述自锁信号。
  10. 如权利要求1所述的BMS休眠唤醒电路，其中，所述唤醒芯片为用于给所述BMS供电的电源芯片，或用于控制所述BMS休眠或唤醒的控制芯片。
  11. 如权利要求1所述的BMS休眠唤醒电路，其中，所述第一电平信号包括高电平信号或PWM信号。
  12. 如权利要求1、9或10所述的BMS休眠唤醒电路，其中，所述控制电路与所述唤醒芯片为同一个控制芯片。
  13. 一种BMS休眠唤醒方法，其中，包括：
    在充电设备接入时，根据所述充电设备提供的第一电平信号产生预设时长的使能电平使能BMS的唤醒芯片启动以唤醒BMS；
    在所述预设时长的时间内产生自锁信号以维持所述唤醒芯片在启动状态；
    若接收到休眠信号，则停止输出所述自锁信号以关闭所述唤醒芯片，使所述BMS进入休眠。
  14. 如权利要求13所述的BMS休眠唤醒方法，其中，所述第一电平信号包括高电平信号或PWM信号。
  15. 一种BMS，其中，包括权利要求1至12任一项所述的BMS休眠唤醒电路。
  16. 一种用电设备，包括电池，其中，还包括权利要求15所述的BMS。
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