WO2021237409A1 - Circuit de protection, système d'alimentation électrique d'un dispositif à disque dur et dispositif de véhicule - Google Patents

Circuit de protection, système d'alimentation électrique d'un dispositif à disque dur et dispositif de véhicule Download PDF

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Publication number
WO2021237409A1
WO2021237409A1 PCT/CN2020/092109 CN2020092109W WO2021237409A1 WO 2021237409 A1 WO2021237409 A1 WO 2021237409A1 CN 2020092109 W CN2020092109 W CN 2020092109W WO 2021237409 A1 WO2021237409 A1 WO 2021237409A1
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WIPO (PCT)
Prior art keywords
current
unit
voltage
power supply
protection circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/092109
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English (en)
Chinese (zh)
Inventor
马鹏
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Streamax Technology Co Ltd
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Streamax Technology Co Ltd
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Priority to CN202080000815.3A priority Critical patent/CN111788752A/zh
Priority to PCT/CN2020/092109 priority patent/WO2021237409A1/fr
Publication of WO2021237409A1 publication Critical patent/WO2021237409A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • G07C5/0841—Registering performance data
    • G07C5/0875—Registering performance data using magnetic data carriers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters

Definitions

  • This application relates to the technical field of protection circuits, and in particular to a protection circuit, a power supply system of a hard disk device, and a vehicle-mounted device. Background technique
  • the vehicle-mounted monitoring host is called the black box of the car, and is responsible for the collection of information such as vehicle internal and external vehicle condition data, and real-time status of personnel.
  • the hard disk storage device in the monitoring host is also called the heart of the monitoring host, which mainly saves the collected information to the hard disk. Affected by the complex internal and external environment of the car, the power protection of the storage device is particularly important. Once the power supply of the storage device is abnormal, the entire monitoring host will lose its core functions.
  • the PM0S will be damaged first due to the slow response of the fuse; secondly, the overcurrent characteristics of the fuse are easily affected by temperature changes, and the overcurrent capability of the fuse on the device in a high temperature environment will It is greatly reduced, and there is a situation that the hard disk cannot be supplied with power; in addition, the protection circuit of the conventional storage device cannot absorb the voltage spike caused by the fast start and stop of the hard disk motor, and the long-term existence of the spike may damage the hard disk.
  • on-vehicle monitoring storage devices use mechanical hard disks.
  • One of the objectives of the embodiments of the present application is to provide a protection circuit, a power supply system of a hard disk device, and an in-vehicle device, aiming to solve the problem of low reliability of the traditional protection circuit.
  • a protection circuit including:
  • the current limiting unit is used to connect a power signal and output the power signal at the output terminal when the current of the power signal is below a preset value
  • an anti-backflow unit connected between the loads at the output ends of the current limiting unit, and the anti-backflow unit is used to unidirectionally transmit the power signal to the load;
  • a bleeder unit is connected to the power supply transmission link between the output end of the anti-backflow unit and the load, and the bleeder unit is used to bleed voltage spikes on the power supply transmission link.
  • the current limiting unit and the power supply transmission link are decoupled from a self-recovery fuse.
  • the current-limiting unit includes a control module and a current-limiting module connected to the control module, and the current-limiting module is used to access a power signal and express the The current monitoring signal whether the current exceeds a preset value is fed back to the control module, and the control module is used to control the output of the current limiting module or shut off the output of the power signal according to the current monitoring signal.
  • control module includes a control chip
  • control chip has a current monitoring pin connected to the current limiting module and a current monitoring pin for controlling the output of the current limiting module or turning off the output.
  • the control chip controls the level state of the enable pin according to the level state of the current monitoring signal received by the current monitoring pin.
  • the current-limiting module includes a current-limiting chip and a first resistor, and the current-limiting chip has an input pin for accessing the power signal and is connected to the first resistor Connected, a programmable current limiting pin used to adjust the preset value of the current, and a current feedback pin used to output the current monitoring signal, and a current feedback pin used to connect to the enable pin of the control chip An enable control pin, and an output pin for outputting the power signal.
  • the anti-backflow unit includes a diode, the anode of the diode is connected to the output end of the current limiting unit, and the cathode is connected to the load.
  • the bleeder unit includes a voltage detection unit and a normally open bleeder branch, and the voltage detection unit is used to detect the voltage of the power supply transmission link when the voltage exceeds Threshold, control The discharge branch is controlled to be turned on to discharge the voltage spike on the power supply transmission link.
  • the voltage detection unit includes a voltage divider network and a comparator unit, one end of the voltage divider network is connected to the output end of the anti-backflow unit, and the voltage divider of the voltage divider network The output terminal is connected to the comparator unit, and the comparator unit compares the divided voltage signal output by the voltage dividing network with a reference voltage, and outputs a comparison result to control the on-off of the discharge branch.
  • the bleeder branch includes a conductive switch and a bleeder resistor connected in series between the output terminal of the anti-backflow unit and the ground, and the control terminal of the conductive switch and the comparator The output terminal of the unit is connected.
  • the conductive switch includes a semiconductor switch, an electromagnetic conductive switch, or a switch integrated circuit. .
  • a power supply system for a hard disk device including:
  • the voltage conversion circuit is used to connect to an input power source, and output a power signal after voltage conversion of the input power source;
  • the protection circuit is connected between the voltage conversion circuit connection and the power terminal of the hard disk device.
  • the voltage conversion circuit includes:
  • the buck-boost conversion module is used to connect to the input power source and convert the input power source into the power source signal;
  • the step-down module is connected to the step-up and step-down conversion module, and the step-down module is used to step down the power signal and output it.
  • the buck-boost converter module includes a Buck-Boost converter.
  • the step-down module includes a Buck converter.
  • an in-vehicle device which includes a hard disk device, and further includes the protection circuit described in the first aspect, or the power supply system of the hard disk device described in the second aspect.
  • the beneficial effects of the protection circuit are: if the power signal is overcurrent, the current limiting unit will turn off the output of the power signal, and the bleeder unit is responsible for monitoring whether there is a voltage spike in the power supply transmission link, If there is a spike, the bleeder unit will absorb the voltage spike, which effectively protects the stability of the power supply voltage of the load equipment and improves the reliability of the load power supply.
  • the anti-backflow unit will cut off the voltage higher than the power signal and backflow back to the power supply to ensure the power supply. Unaffected, the entire protection circuit does not use fuse devices, so that the over-current protection is still reliable and effective in high-temperature environments.
  • FIG. 1 is a schematic structural diagram of a protection circuit provided by one of the embodiments of the present application.
  • FIG. 2 is a schematic structural diagram of a protection circuit provided by an embodiment of the present application.
  • FIG. 3 is a circuit diagram of a protection circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a power supply system of a hard disk device according to an embodiment of the present application. Inventive embodiment of the present invention
  • the protection circuit provided by some embodiments of the first aspect of the present application includes a current limiting unit 10, an anti-backflow unit 20, and a discharge unit 30.
  • the current limiting unit 10 is used to connect to the power signal Vdd, and output the power signal Vdd at the output terminal when the current of the power signal Vdd is below the preset value; the anti-backflow unit 20 is connected to the output terminal of the current limiting unit 10. Between loads 100, the anti-backflow unit 20 is used to unidirectionally transmit the power signal Vdd to the load 100; the discharge unit 30 is connected to the power supply transmission link between the output end of the anti-backflow unit 20 and the load 100 to discharge The unit 30 is used to discharge voltage spikes on the power transmission link 102.
  • the current limiting unit 10 will turn off the output of the power signal Vdd. If a voltage spike occurs, the bleeder unit 30 will absorb the voltage spike, effectively protecting the power supply voltage stability of the load 100 device. The reliability of the power supply of the load 100 is improved, and the backflow prevention unit 20 backflows the voltage that is higher than the power signal Vdd to the power source to ensure that the power source is not affected.
  • the load 100 may be a hard disk device, a motor device, a lighting device, etc.
  • the current limiting unit 10 and the power supply transmission link 102 are decoupled from the resettable fuse, and the entire protection circuit does not use fuse devices, so that the overcurrent protection is still reliable and effective in a high temperature environment.
  • the current limiting unit 10 includes a control module 110 and a current limiting module 120 connected to the control module 110.
  • the current limiting module 120 is used to access the power signal Vdd
  • the control module 110 is used for controlling the output of the current limiting module 120 or turning off the output power signal Vdd according to the current monitoring signal ECD indicating whether the current of the power signal Vdd exceeds a preset value.
  • the current limiting module 120 can detect the current by itself, and feeds back the current monitoring signal ECD indicating whether the current of the power signal Vdd exceeds a preset value to the control module 110, and the control module 110 is based on the current monitoring signal ECD
  • the level state output enable signal P_EN controls the on-off between the input terminal and the output terminal of the current-limiting module 120 to output or turn off the output power signal Vdd; when the current of the power signal Vdd exceeds the preset value, the current limit The module 120 is controlled to turn off the output power signal Vdd, so as to achieve the purpose of current limiting.
  • control module 110 may be used The resistance is used to detect the current of the power signal Vdd, the current is judged after analog-to-digital conversion is performed on the detection signal inside or outside the control module 110, and the enable signal P_EN is directly output according to the judgment result to control the on and off of the current limiting module 120.
  • the control module 110 includes a control chip.
  • the control chip has a current monitoring pin CS' connected to the current limiting module 120 and is used to control the current limiting chip to be turned on or off.
  • the enable pin EN' of the output power signal Vdd the control chip controls the level state of the enable pin EN' according to the level state of the current monitoring signal ECD received by the current monitoring pin CS'.
  • the control chip can be a single-chip microcomputer, such as a chip already set on the main board of the device to which the protection circuit is applied, without additional settings, high integration and low cost. Of course, it is also considered to independently set up a single-chip microcomputer for this scheme.
  • the current-limiting module 120 includes a current-limiting chip 122 and a first resistor 124, and the current-limiting chip 122 has an input pin VS, a programmable current-limiting pin CL, and current feedback Pin CS, enable control pin DIAG_EN, and output pin OUT.
  • the input pin VS is used to connect to the power signal Vdd;
  • the programmable current-limiting pin CL is connected to the first resistor 124 and is used to adjust the preset value of the current.
  • the preset value of the current can be adjusted by adjusting the resistance of the first resistor 124 Set value;
  • the current feedback pin CS is connected to the current monitoring pin CS' of the control chip, and is used to output the current monitoring signal ECD.
  • the high and low level status of the current monitoring signal ECD indicates whether there is overcurrent; the enable control pin DIAG_EN is used for Connected to the enable pin EN' of the control chip, the current-limiting chip 122 works in the state of outputting or turning off the output power signal Vdd according to the level state of the enable signal P_EN output by the control chip; the output pin OUT is used to output power Signal Vdd.
  • the current-limiting chip 122 is used for current-limiting control, with current detection. Compared with the traditional solution using MOS tubes, it has higher reliability and can use external resistors to provide programmable current limit. Specifically, a single-channel intelligent high-side switch can be used.
  • the anti-backflow unit 20 includes a diode.
  • the anode of the diode is connected to the output terminal of the current limiting unit 10, and the cathode is connected to the load 100.
  • a unidirectional Schottky diode is used, and the main function of the diode is forward conduction. The feature of reverse cut-off realizes the function of preventing backflow.
  • the load 100 takes a hard disk with a rated voltage of 12V as an example, and the first resistor 124 is set to 1.2 K to indicate that the current limiting chip 122 can withstand a current of 2A (ie, the preset value of the current), if the power signal The Vdd current exceeds 2A, that is, the power supply of the load 100 is in an overcurrent state.
  • the enable signal output by the enable pin EN' of the control chip?_ EN is turned on by default, and the current monitoring signal ECD is by default a high signal. .
  • the realization logic of current overcurrent protection is: When the power signal Vdd has a current exceeding 2A or the positive and negative poles of the load 100 are short-circuited, the current-limiting core The current feedback pin CS of the chip 122 will output a low-level signal to the system control chip. After receiving the low-level signal, the control chip will promptly send out relevant warning information and turn off the enable signal?_£1 Pull the low level to limit the current The chip 122 turns off the output.
  • Anti-backflow protection realization logic When the power of the load 100 is mistakenly touched higher than 12V, the diode will cut off the voltage higher than 12V and backflow back to the system that outputs the power signal Vdd to ensure that the system is not affected.
  • the entire current limiting unit 10 does not use a fuse device, which also effectively solves the problem that hard disk overcurrent protection can be used at high temperatures.
  • the bleeding unit 30 includes a voltage detection unit 310 and a normally open bleeding branch 320.
  • the voltage detection unit 310 is used to detect the voltage of the power transmission link 102.
  • the control bleeder branch 320 is turned on to bleed the voltage spike on the power transmission link 102, so as to prevent the load 100 from being impacted by the voltage spike and cause damage.
  • the bleeder branch 320 is normally open to prevent the power transmission link 102 from directly reaching the ground to form an energy-consuming loop.
  • the voltage detection unit 310 includes a voltage divider network 312 and a comparator unit 314, one end of the voltage divider network 312 is connected to the output end of the anti-backflow unit 20, that is, the cathode of the diode
  • the voltage dividing output end of the voltage dividing network 312 is connected to the comparator unit 314, and the comparator unit 314 compares the voltage dividing signal output by the voltage dividing network 312 with the reference voltage, and outputs the comparison result to control the opening and closing of the bleeder branch 320.
  • the voltage dividing network 312 includes voltage dividing resistors R1, R2, the voltage dividing resistors R1, R2 are connected in series between the output terminal of the anti-backflow unit 20 and the ground, and the common terminal of the voltage dividing resistors R1, R2 is used as the voltage dividing output. end.
  • the comparator unit 314 can use a comparison chip with a built-in reference voltage and a comparator, which is highly integrated and is conducive to miniaturization; the comparator unit 314 can also use a comparator of a discrete device and a reference for providing the reference voltage.
  • the voltage source is constituted, and the reference voltage source can be a voltage stabilizer or a voltage divider circuit, which is low in cost.
  • the bleeder branch 320 includes a normally open conductive switch 322 and a bleeder resistor connected in series to the output end of the anti-backflow unit 20, that is, between the cathode of the diode and the ground. 324.
  • the control terminal of the conductive switch 322 is connected to the output terminal of the comparator unit 314.
  • the bleeder resistor 324 is connected to the cathode of the diode, and the conductive switch 322 includes a semiconductor switch, an electromagnetic conductive switch 322 or a switch integrated circuit.
  • the semiconductor switch adopts a MOS tube
  • the comparator unit 314 controls the MOS tube to be turned on by outputting a driving voltage to the grid of the MOS tube, so that the bleeder resistor 324 discharges the voltage (pulse) spikes that appear.
  • the electromagnetic conductive switch 322 may be a relay.
  • the load 100 takes a hard disk with a rated voltage of 12V as an example, and the comparator unit 314 uses a comparison chip, which is actually a comparator circuit inside, and has a reference voltage (for example, 1.226V). The reference voltage is compared with the monitoring input pin SENSE of the comparator unit 314 for voltage comparison.
  • the output pin /RESET of the comparator unit 314 When the voltage of the monitoring input pin SENSE is greater than 1.226V, the output pin /RESET of the comparator unit 314 outputs a high-level control signal, Otherwise, a low-level signal is output.
  • the voltage divider resistors R1 and R2 divide the voltage of the power signal V dd to obtain 12. 7V as the threshold value. If the power signal Vdd is greater than 12.7V, the output pin /RESET of the comparator unit 314 will output a high level. .
  • the reason for setting 12. 7V as the threshold is because the hard disk meets the working voltage of the hard disk within the range of 12V ⁇ 10%. In this way, the power signal Vdd is greater than the voltage of 12.7V, the bleeder unit 30 will default to an abnormal voltage spike signal, and the bleeder branch 320 will be opened for voltage absorption.
  • the bleeder branch 320 is mainly composed of a high-power NMOS tube and a bleeder resistor 324. Since the voltage pulse glitch time caused by the hard disk power on is short, a bleeder resistor 324 is required to discharge and absorb the ground (GND). . When the bleeder resistor 324 is connected to the ground, the ground loop needs to be closed. The reason why it needs to be closed is because if it is always open under normal conditions, the bleeder resistor 324 to the ground will lose part of the efficiency. Absorb the voltage spike logic caused by the hard disk power on: Normally, the voltage of the power signal Vdd is 12V.
  • the voltage After being divided by the voltage divider resistors R1 and R2, the voltage does not reach the reference voltage value of the comparator unit 314, and the output of the comparator unit 314 is low.
  • the level signal is given to the high-power NMOS tube, the high-power NMOS tube is cut off, and the ground loop of the bleeder resistor 324 is not opened, and there is no bleed action.
  • the voltage of the power signal Vdd is higher than the voltage pulse spike of 12.7V, the voltage pulse spike is higher than the reference voltage value of the comparator unit 314 after being divided by the voltage dividing resistors R1 and R2, and the comparator unit 314 outputs a high voltage.
  • the flat signal is given to the high-power NMOS tube, the high-power NMOS tube is opened, and the bleeder resistor 324 forms a ground loop, thereby bleeding the voltage pulse spikes that appear.
  • the comparator unit 314 outputs a low level, the high-power NMOS tube closes the bleeder, and then performs the next cycle of voltage monitoring.
  • the power supply system of the hard disk device provided by some embodiments of the second aspect of the present application includes a voltage conversion circuit 200 and the protection circuit provided in the first aspect.
  • the voltage conversion circuit 200 is connected to an input power source V in.
  • the input power source Vin is voltage-converted to output the above-mentioned power signal Vdd;
  • the protection circuit is connected between the voltage conversion circuit 200 and the power terminal of the hard disk device 104, and the protection circuit will protect the hard disk device 104 from overcurrent and overvoltage.
  • the voltage conversion circuit 200 is also protected against backflow.
  • the voltage conversion circuit 200 includes a buck-boost conversion module 210 and a buck module 220.
  • the buck-boost conversion module 210 is used to connect the input power Vin, and convert the input power Vin into a power signal Vdd. It can use a Buck-Boost converter, such as transforming the input power Vin from 8V to 48V The 12V power signal Vdd is supplied to the hard disk device 104.
  • the step-down module 220 is connected to the step-up and step-down conversion module 210, and the step-down module 220 is used to step down the power signal Vdd and output it, which can use a Buck converter, such as transforming the 12V power signal Vdd into 3. 3V Or a working voltage of 5V is supplied to the control chip, the current limiting chip 122, and the comparator unit 314.
  • a Buck converter such as transforming the 12V power signal Vdd into 3. 3V Or a working voltage of 5V is supplied to the control chip, the current limiting chip 122, and the comparator unit 314.
  • the vehicle-mounted device provided by some embodiments of the second aspect of the present application includes a hard disk device and the above-mentioned protection circuit, or the above-mentioned power system of the hard disk device.
  • the above-mentioned protection circuit can be used not only for hard disk power supply, but also for display screens, speakers, vehicle-mounted computers, driving recorders and other equipment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un circuit de protection, un système d'alimentation électrique d'un dispositif à disque dur et un dispositif de véhicule, qui se rapportent au domaine technique des circuits de protection, protègent efficacement un dispositif de charge et améliorent la fiabilité de fourniture d'énergie à une charge. Le circuit de protection comprend une unité de limitation de courant (10), une unité anti-retour (20) et une unité de décharge (30), l'unité de limitation de courant (10) est utilisée pour recevoir un signal d'alimentation électrique (Vdd) et fournir le signal d'alimentation électrique (Vdd) à partir d'une extrémité de sortie lorsque le courant du signal d'alimentation électrique (Vdd) est inférieur à une valeur prédéfinie ; l'unité anti-retour (20) est connectée entre l'extrémité de sortie de l'unité de limitation de courant (10) et une charge, et l'unité anti-retour (20) est utilisée pour transmettre de manière unidirectionnelle le signal d'alimentation électrique (Vdd) à la charge (100) ; et l'unité de décharge (30) est connectée à une liaison de transmission d'alimentation électrique (102) entre une extrémité de sortie de l'unité anti-retour (20) et la charge (100), et l'unité de décharge (30) est utilisée pour décharger une pointe de tension sur la liaison de transmission d'alimentation électrique (102).
PCT/CN2020/092109 2020-05-25 2020-05-25 Circuit de protection, système d'alimentation électrique d'un dispositif à disque dur et dispositif de véhicule Ceased WO2021237409A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080000815.3A CN111788752A (zh) 2020-05-25 2020-05-25 一种保护电路、硬盘设备的电源系统以及车载设备
PCT/CN2020/092109 WO2021237409A1 (fr) 2020-05-25 2020-05-25 Circuit de protection, système d'alimentation électrique d'un dispositif à disque dur et dispositif de véhicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/092109 WO2021237409A1 (fr) 2020-05-25 2020-05-25 Circuit de protection, système d'alimentation électrique d'un dispositif à disque dur et dispositif de véhicule

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WO2021237409A1 true WO2021237409A1 (fr) 2021-12-02

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CN114428981A (zh) * 2022-01-28 2022-05-03 浪潮(北京)电子信息产业有限公司 一种数据保护系统和数据保护方法、装置及介质
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