CN220856443U

CN220856443U - Relay drive circuit, electronic equipment and vehicle

Info

Publication number: CN220856443U
Application number: CN202322519592.5U
Authority: CN
Inventors: 韩锋; 郭泽民
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-26
Anticipated expiration: 2033-09-15

Abstract

The utility model provides a relay driving circuit, electronic equipment and a vehicle, which belong to the technical field of electromagnetic driving and comprise the following components: the power supply, the relay, the control module, the first switch unit, the second switch unit and the voltage dividing unit; the control module is used for controlling the first switch unit and the second switch unit to be conducted in a target time period so as to enable the power supply output actuation voltage control relay to be converted from an unapplied state to an actuation state; after the target time period, controlling the first switch unit to be turned on and the second switch unit to be turned off so as to enable the power supply output maintaining voltage to control the relay to maintain the attraction state; wherein the pull-in voltage is greater than the hold voltage. The relay driving circuit provided by the utility model not only can reduce the energy consumption and heat of the relay, but also can prolong the service life of each electronic element on the relay driving circuit.

Description

Relay drive circuit, electronic equipment and vehicle

Technical Field

The utility model belongs to the technical field of electromagnetic driving, and particularly relates to a relay driving circuit, electronic equipment and a vehicle.

Background

Electromagnetic relays are widely used, and when the input end parameters meet the specified requirements, the controlled quantity in the output end circuit can generate preset step change, so that the aim of controlling high power by using small signals is fulfilled, and the input and output loops are electrically isolated from each other, so that the electromagnetic relay is one of the most important control elements.

In practical application, some relays are in a working state for a long time, and usually, because the parameter characteristics are not fully considered in the circuit design, the power consumption of the relay cannot be optimized, and for the application with more sensitive energy consumption and temperature, some problems exist, such as large heat generated in the working process of the relay in a closed space and no heat is emitted, the reliability and the service life of the relay and other electronic elements in the circuit are adversely affected, and a part of electric energy is wasted.

Disclosure of utility model

In view of the above, embodiments of the present application provide a relay driving circuit, an electronic device, and a vehicle so as to overcome or at least partially solve the above-described problems.

In a first aspect of the embodiment of the present application, there is provided a relay driving circuit including: the power supply, the relay, the control module, the first switch unit, the second switch unit and the voltage dividing unit;

the first output end of the control module is connected with the first input end of the first switch unit, the second output end of the control module is connected with the first input end of the second switch unit, the second input end of the first switch unit is connected with the first end of the relay, and the output end of the first switch unit is respectively connected with the second input end of the second switch unit and the first end of the voltage dividing unit;

The second end of the relay is connected with the power supply, and the output end of the second switch unit and the second end of the voltage dividing unit are respectively connected with the grounding end;

The control module is used for controlling the first switch unit and the second switch unit to be conducted in a target time period so that the power supply output actuation voltage controls the relay to be switched from the non-actuation state to the actuation state;

And after the target time period, controlling the first switch unit to be turned on and the second switch unit to be turned off so that the power supply output maintaining voltage controls the relay to maintain the suction state; wherein the pull-in voltage is greater than the hold voltage.

Further, the control module includes: a controller and a capacitor; the output end of the controller is respectively connected with the first input end of the first switch unit and the first end of the capacitor, and the second end of the capacitor is connected with the first input end of the second switch unit.

Further, the control module further includes: a first resistor and a second resistor; the first end of the first resistor is connected with the output end of the controller, the second end of the first resistor is respectively connected with the first input end of the first switch unit, the first end of the capacitor and the first end of the second resistor, and the second end of the second resistor is connected with the grounding end.

Further, the control module further comprises a third resistor and a fourth resistor; the first end of the third resistor and the first end of the fourth resistor are respectively connected with the second end of the capacitor, the second end of the fourth resistor is connected with the first input end of the second switch unit, and the second end of the third resistor is connected with the grounding end.

Further, the method further comprises the following steps: a diode; the diode is connected in parallel with two ends of the relay.

Further, the first switch unit and the second switch unit are triodes or MOS tubes.

Further, the voltage of the second resistor is greater than or equal to the turn-on voltage of the first switch unit, and the voltage difference between the third resistor and the fourth resistor is greater than or equal to the turn-on voltage of the second switch unit.

Further, the relay is a direct current relay, and the power supply is a direct current voltage source.

According to a second aspect of the embodiment of the application, an electronic device is provided, and the electronic device comprises the relay driving circuit according to the first aspect of the embodiment of the application.

According to a third aspect of the embodiment of the present application, there is provided a vehicle, which includes the relay driving circuit according to the first aspect of the embodiment of the present application, or the electronic device according to the second aspect of the embodiment of the present application.

The relay driving circuit provided by the embodiment of the application comprises: the power supply, the relay, the control module, the first switch unit, the second switch unit and the voltage dividing unit; the first output end of the control module is connected with the first input end of the first switch unit, the second output end of the control module is connected with the first input end of the second switch unit, the second input end of the first switch unit is connected with the first end of the relay, and the output end of the first switch unit is respectively connected with the second input end of the second switch unit and the first end of the voltage dividing unit; the second end of the relay is connected with a power supply, and the output end of the second switch unit and the second end of the voltage dividing unit are respectively connected with a grounding end; the control module is used for controlling the first switch unit and the second switch unit to be conducted in a target time period so as to enable the power supply output actuation voltage control relay to be converted into an actuation state from an unapplication state; after the target time period, the control module controls the first switch unit to be turned on and the second switch unit to be turned off so that the power supply output keeps the voltage to control the relay to maintain the suction state; wherein the pull-in voltage is greater than the hold voltage.

According to the relay driving circuit provided by the embodiment, when the relay is in the non-actuation state, the control module controls the first switch unit and the second switch unit to be conducted in the target time period, so that the voltage output by the power supply sequentially passes through the relay, the first switch unit and the second switch unit to the grounding end, the voltage passing through the relay is actuation voltage at the moment, the relay is actuated, the relay is converted into the actuation state from the non-actuation state, then after the target time period, the control module controls the first switch unit to be conducted, the second switch unit is turned off, so that the voltage output by the power supply sequentially passes through the relay, the first switch unit and the voltage dividing unit to the grounding end, the voltage output by the power supply is kept at the moment, and the voltage dividing unit bears the voltage output by part of the power supply, so that the holding voltage passing through the relay is smaller than the actuation voltage passing through the relay in the target time period, and compared with the heat generated when the relay maintains the actuation state at the holding voltage, the power supply is less than the power consumption required when the relay is maintained in the actuation state.

Compared with the actuation voltage, the relay maintains the working state of the relay, when the actuation voltage passes through the relay, the heat generated by the relay can be lower, the consumption of a power supply is reduced, the reliability of a relay driving circuit can be improved, and the service life of each element on the circuit can be prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a structure of a relay driving circuit provided in the related art;

Fig. 2 is a schematic diagram of a relay driving circuit according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a relay driving circuit according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a relay driving circuit provided by the related art, and it is known from the diagram that, when the relay normally works, that is, the relay is in the on state, the voltage provided by the dc voltage source VCC will not change and still be the on voltage, but the voltage required by the relay in the on state is smaller than the on voltage, so that the voltage passing through the relay is redundant and unnecessary, the relay will generate some unnecessary energy consumption, and the larger the voltage passing through the relay, the more heat generated by the relay will be generated, if the heat generated by the relay is in a closed space, the heat generated by the relay is likely not to be timely emitted, so that the temperature of other electronic components in the circuit where the relay is located will be increased, the performance and the service life of the electronic components will be influenced, and the reliability of the circuit where the relay is located will be further reduced.

Therefore, the application aims at the problems and provides a relay driving circuit which is used for reducing the energy consumption and the heating value of a relay and improving the working environment of a circuit where the relay is positioned.

Referring to fig. 2, fig. 2 is a schematic diagram of a relay driving circuit according to an embodiment of the present application, where the relay driving circuit includes: a power supply 201, a relay 202, a control module 203, a first switch unit 204, a second switch unit 205, and a voltage dividing unit 206; a first output end of the control module 203 is connected with a first input end of the first switch unit 204, a second output end of the control module 203 is connected with a first input end of the second switch unit 205, a second input end of the first switch unit 204 is connected with a first end of the relay 202, an output end of the first switch unit 204 is respectively connected with a second input end of the second switch unit 205 and a first end of the voltage dividing unit 206, a second end of the relay 202 is connected with the power supply 201, and an output end of the second switch unit 205 and a second end of the voltage dividing unit 206 are respectively connected with a ground terminal 207; the control module 203 is configured to control the first switch unit 204 and the second switch unit 205 to be turned on in a target period of time, so that the power supply 201 outputs an actuation voltage to control the relay 202 to switch from the non-actuation state to the actuation state; and controlling the first switching unit 204 to be turned on and the second switching unit 205 to be turned off after the target period of time, so that the power supply 201 outputs a holding voltage to control the relay 202 to maintain the actuation state; wherein the pull-in voltage is greater than the hold voltage.

In this embodiment, the power supply 201 is a power supply 201 that can be set according to the characteristics of the relay 202, for example, the relay 202 is a dc relay, then the power supply 201 is a dc voltage source, the relay 202 is an ac relay, and then the power supply 201 is an ac voltage source.

The control module 203 is used as a control end of the relay driving circuit, and has the functions of outputting different control signals after a target time period and the target time period to control whether the first switch unit 204 and the second switch unit 205 are in a conducting or a switching-off state, the control module 203 can output corresponding control signals to control the first switch unit 204 to be conducted through a first output end in the target time period, output corresponding control signals to control the second switch unit 205 to be conducted through a second output end after the target time period, and output corresponding control signals to control the first switch unit 204 to be conducted through the first output end, and output corresponding control signals to control the second switch unit 205 to be switched off through the second output end, so that different loops where the relay 202 is located are conducted, and the relay 202 is powered when the power supply 201 is in different states after the target time period and the target time period.

The control module 203 may be a timing controller, and may output different control signals to the first switch unit 204 and the second switch unit 205 at different times to implement on-off of the first switch unit 204 and the second switch unit 205, and if the first switch unit 204 and the second switch unit 205 are both turned on at a high level and turned off at a low level, the control module in this embodiment will output the high level to the first switch unit 204 and the second switch unit 205 in a target period, and control the first switch unit 204 and the second switch unit 205 to be turned on, and after the target period, keep the output of the high level from the first switch unit 204 and the output of the low level to the second switch unit 205, and at this time, the first switch unit 204 is turned on and the second switch unit 205 is turned off. In addition, the control module may be a timing trigger controller, a time control relay, etc., and specific control procedures are not described in detail herein, as long as it is ensured that the first switch unit 204 and the second switch unit 205 are turned on in a target period, and the first switch unit 204 is turned on and the second switch unit 205 is turned off after the target period.

The first switch unit 204 and the second switch unit 205 are implemented as a switch, and are controlled by the control module 203 to output different control signals to realize on or off, so as to conduct the relay 202 to different power supply loops.

The voltage dividing unit 206 is configured according to the difference between the corresponding actuation voltage and the holding voltage of the relay 202 in different states, and the function is that when the relay 202 is in the actuation state, the power supply 201 still outputs the actuation voltage to the relay 202, and the voltage dividing unit 206 bears the voltage in part of the actuation voltage, so that the actuation voltage outputted by the power supply 201 can keep the relay 202 in the actuation state through the voltage of the relay 202. The voltage dividing unit 206 may be a resistor with a fixed resistance value or a resistor with an adjustable resistance value.

The state of the relay 202 is divided into two states, one being an unapplied state and one being an engaged state. When the relay 202 is operating normally, it is in an engaged state.

If the relay 202 is to be switched from the non-actuation state to the actuation state, the control module 203 outputs control signals to the first switch unit 204 and the second switch unit 205 in a target period, the control signals may be digital signals, analog signals, PWM signals, etc., and if the control signal output by the control module 203 is digital signals and the first switch unit 204 and the second switch unit 205 are controlled to be on by a high level, the first switch unit 204 and the second switch unit 205 will be on if the control module 203 outputs a high level at this time, and at this time, the actuation voltage output by the power supply 201 will sequentially pass through the relay 202, the first switch unit 204, and the second switch unit 205 to the ground terminal 207, when the actuation voltage passes through the relay 202, the current of the coil in the relay 202 will change, a magnetic force will be generated, and as long as the current of the coil reaches a sufficient intensity, that is, when the voltage passing through the relay 202 reaches the actuation voltage of the relay 202, the generated magnetic force will cause the relay 202 to be switched from the non-actuation state.

After the target period, since the pull-in voltage output by the power supply 201 to the relay 202 is unchanged, but the required holding voltage for maintaining the relay 202 in the pull-in state is smaller than the pull-in voltage, a voltage dividing unit 206 is connected in series between the first switch unit 204 and the ground terminal 207, at this time, the control module 203 will continue to output a high level to the first switch unit 204 and stop outputting a high level to the second switch unit 205, then the first switch unit 204 continues to be turned on, the second switch unit 205 is turned off, at this time, the pull-in voltage output by the power supply 201 will sequentially pass through the relay 202, the first switch unit 204 and the voltage dividing unit 206 to the ground terminal 207, and due to the existence of the voltage dividing unit 206, a part of the pull-in voltage output by the power supply 201 will be borne, so that the voltage passing through the relay 202 is the holding voltage, at this time, the voltage passing through the relay 202 will be smaller than the voltage in the non-pull-in state of the relay 202, thereby achieving the purpose of saving energy.

According to the relay driving circuit provided by the embodiment, when the relay 202 is in an unapplied state, the control module 203 controls the first switch unit 204 and the second switch unit 205 to be conducted, so that the power supply 201 outputs the actuation voltage which sequentially passes through the relay 202, the first switch unit 204 and the second switch unit 205 to the grounding end 207, the relay 202 is enabled to be actuated at the moment, then the control module 203 controls the second switch unit 205 to be turned off, the first switch unit 204 is kept to be conducted, so that the power supply 201 outputs the actuation voltage which sequentially passes through the relay 202, the first switch unit 204 and the voltage dividing unit 206 to the grounding end 207, the relay 202 is enabled to be kept at the moment, and because the kept voltage is smaller than the actuation voltage, the relay 202 keeps the heat generated in the actuation state under the kept voltage, and compared with the power required by the relay 202 kept in the actuation state under the actuation voltage, the consumption of the power supply 201 is reduced.

And compared with the actuation voltage maintaining the working state of the relay 202, when the actuation voltage passes through the relay 202, the heat generated by the relay 202 can be lower, the consumption of the relay 202 to the power supply 201 can be reduced, the reliability of the relay driving circuit can be improved, and the service life of each electronic element on the relay driving circuit can be prolonged.

In one embodiment, the control module 203 includes: the controller MCU and the capacitor C1; the output end of the controller MCU is connected to the first input end of the first switch unit 204 and the first end of the capacitor C1, and the second end of the capacitor C1 is connected to the first input end of the second switch unit 205.

Referring to fig. 3 in combination, fig. 3 is a schematic structural diagram of a relay driving circuit according to an embodiment of the present application, in this embodiment, in combination with fig. 2, the first switch unit 204 in fig. 2 corresponds to the transistor Q1 in fig. 3, the second switch unit 205 corresponds to the transistor Q2 in fig. 3, the voltage dividing unit 206 corresponds to the voltage dividing resistor R in fig. 3, it can be seen from fig. 3 that the control module 203 includes a controller MCU (Microcontroller Unit, a microcontroller unit) and a capacitor C1, the controller MCU is configured to output a level signal (high level or low level) to the first switch unit 204 and the second switch unit 205, to control the on and off of the first switch unit 204 and the second switch unit 205, when the first switch unit 204 and the second switch unit 205 are in a target period, i.e. in an unapplied state, since the output end of the controller MCU is respectively connected to the first input end of the first switch unit 204 and the first end a of the capacitor C1, the second end b of the capacitor C1 is connected to the first input end of the second switch unit 205, since the voltage at the two ends of the capacitor C1 cannot be suddenly changed at the moment when the controller MCU outputs the high level to the capacitor C1, and the voltage at the two ends of the capacitor C1 is equal to zero, which is equivalent to a short circuit state at the two ends of the capacitor C1, the high level output by the controller MCU reaches the first input end of the first switch unit 204 and reaches the first input end of the second switch unit 205 through the capacitor C1, at this moment, the first switch unit 204 and the second switch unit 205 are in a conducting state, at this moment, the loops where the power supply 201, the relay 202, the first switch unit 204, the second switch unit 205 and the ground terminal 207 are located are conducted, the pull-in voltage output by the power supply 201 acts on the relay 202, at this time, the relay 202 is switched from the non-suction state to the suction state.

Since the high level output by the controller MCU acts on the first input terminal of the first switch unit 204 and the capacitor C1 all the time in the target period, the capacitor C1 is always in a charged state, after a period of time, that is, after the target period of time, the capacitor C1 is fully charged, and both ends of the capacitor C1 are in an open state, then the high level output by the controller MCU will not enter the first input terminal of the second switch unit 205 through the capacitor C1, and the second switch unit 205 will be turned off, after the target period of time, the loop where the power supply 201, the relay 202, the first switch unit 204, the voltage dividing resistor R and the ground terminal 207 are located will be turned on, and the pull-in voltage output by the power supply 201 acts on the relay 202 and the voltage dividing resistor R, so long as by setting a suitable resistance value of the voltage dividing resistor R, the voltage acting on the relay 202 is ensured to be a holding voltage, and the pull-in state of the relay 202 is maintained.

In one embodiment, the control module 203 further comprises: the first resistor R1 and the second resistor R2; the first end of the first resistor R1 is connected to the output end of the controller MCU, the second end of the first resistor R1 is connected to the first input end of the first switch unit 204, the first end of the capacitor C1, and the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the ground terminal 207.

Referring to fig. 2 and 3, in the present embodiment, the control module 203 further includes a first resistor R1 and a second resistor R2, because when the controller MCU outputs a high level, if the current carried by the high level is too large, the first end of the first switch unit 204 may be directly applied to the first end of the first switch unit 204, so that the first resistor R1 acts as a current limiting function to protect the first switch unit 204, and makes the first switch unit 204 be turned on in a saturated state.

In addition, when the controller MCU is initialized or when the controller MCU starts outputting the high level, the output high level is unstable, so that a pull-down resistor, i.e. the second resistor R2, is arranged in parallel between the first input terminal and the output terminal of the first switch unit 204, to increase the anti-interference capability of the first switch unit 204 and stabilize the operation state of the first switch unit 204.

In one embodiment, the control module 203 further includes a third resistor R3 and a fourth resistor R4; wherein a first end of the third resistor R3 and a first end of the fourth resistor R4 are respectively connected with a second end of the capacitor C1, a second end of the fourth resistor R4 is connected with a first input end of the second switch unit 205, and a second end of the third resistor R3 is connected with the ground terminal 207

Referring to fig. 2 and 3, in the present embodiment, the control module 203 further includes a third resistor R3 and a fourth resistor R4, because when the controller MCU outputs a high level, if the current carried by the high level is too large, the current directly acts on the first end of the second switching unit 205 through the capacitor C1, which may burn out the second switching unit 205, and in addition, the capacitor C1 may generate a situation of incorrect discharging during charging and discharging, so as to increase the current flowing into the second switching unit 205, so that the function of R4 of the fourth resistor is to protect the second switching unit 205, to play a role of limiting current, and make the second switching unit 205 be turned on in a saturated state.

In addition, since the controller MCU is initialized or just starts to output the high level, the output high level is unstable, and the voltage at two ends of the capacitor C1 is equal to zero at the moment when the capacitor C1 receives the high level output by the MCU, which is equivalent to a short circuit state, and the controller MCU does not process the high level, it can be understood that the controller MCU directly outputs the high level to the second switch unit 205, so that a pull-down resistor, that is, the third resistor R3, is arranged in parallel between the first input end and the output end of the second switch unit, thereby increasing the anti-interference capability of the second switch unit 205 and stabilizing the working state of the second switch unit 205.

In one embodiment, further comprising: a diode; wherein the diode is connected in parallel across the relay 202.

Referring to fig. 3, the relay driving circuit provided in this embodiment further includes a diode D1, when the controller MCU outputs a low level to turn off the first switching unit 204, or the power supply 201 stops outputting a voltage to the relay 202, the coil in the relay 202 generates an induced voltage at the moment when the relay 202 is powered off, and the induced voltage is likely to damage each electronic component in the circuit in which the relay 202 is located, so that the diode D1 is connected in parallel to two ends of the relay 202, and thus the induced voltage generated by the coil is eliminated through consumption of the diode D1, so as to protect other electronic components in the circuit in which the relay 202 is located.

In one embodiment, the first switch unit 204 and the second switch unit 205 are transistors or MOS transistors.

In this embodiment, the first switch unit 204 and the second switch unit 205 may be transistors, referring to fig. 2 and 3, that is, the first switch unit 204 is a transistor Q1, the second switch unit 205 is a transistor Q2, then the first input end of the first switch unit 204 corresponds to the base of the transistor Q1, the second input end of the first switch unit 204 corresponds to the collector of the transistor Q1, and the output end of the first switch unit 204 corresponds to the emitter of the transistor Q1; then the first input terminal of the second switching unit 205 corresponds to the base of the transistor Q2, the second input terminal of the second switching unit 205 corresponds to the collector of the transistor Q2, and the output terminal of the second switching unit 205 corresponds to the emitter of the transistor Q2, and the specific connection manner can be seen in fig. 3.

In addition, the first switch unit 204 and the second switch unit 205 may be MOS transistors, and assuming that the first switch unit 204 corresponds to the MOS transistor Q3 and the second switch unit 205 corresponds to the MOS transistor Q4 (note: the MOS transistor Q3 and the MOS transistor Q4 are not shown in the drawing), the first input end of the first switch unit 204 corresponds to the gate of the MOS transistor, the second input end of the first switch unit 204 corresponds to the source of the MOS transistor Q3, and the output end of the first switch unit 204 corresponds to the drain of the MOS transistor Q3; the first input end of the second switch unit 205 corresponds to the gate of the MOS transistor Q4, the second input end of the second switch unit 205 corresponds to the source of the MOS transistor Q4, and the output end of the second switch unit 205 corresponds to the drain of the MOS transistor Q4. Referring to fig. 3, the specific connection mode may be that the transistor is replaced by a MOS transistor.

In one embodiment, the voltage of the second resistor R2 is greater than or equal to the turn-on voltage of the first switch unit 204, and the voltage difference between the third resistor R3 and the fourth resistor R4 is greater than or equal to the turn-on voltage of the second switch unit 205.

In this embodiment, in order to make the first switch unit 204 smoothly conduct, the resistance values of the first resistor R1 and the second resistor R2 need to be set, the setting principle needs to be set according to the conducting voltage of the first switch unit 204 and the voltage indicated by the high level output by the controller MCU, the voltage of the high level may be 5V, 3.3V, etc., and since the voltage of the second resistor R2 is the same as the voltage input to the first input end of the first switch unit 204, the voltage applied to the second resistor R2 needs to be greater than or equal to the conducting voltage of the first switch unit 204 in order to ensure smooth conduction of the first switch unit 204, so that the voltage applied to the second resistor R2 can be ensured to be greater than or equal to the conducting voltage of the first switch unit 204 when the high level output by the controller MCU is ensured.

Similarly, in order to make the second switch unit 205 smoothly conduct, the resistance values of the third resistor R3 and the fourth resistor R4 need to be set, and the setting principle needs to be based on the conducting voltage of the second switch unit 205 and the voltage indicated by the high level output by the controller MCU, because the voltage of the third resistor R3 is equal to the sum of the voltages input to the fourth resistor R4 and the first switch unit 204, in order to ensure smooth conduction of the second switch unit 205, the voltage difference between the voltage applied to the third resistor R3 and the voltage applied to the fourth resistor R4 needs to be greater than or equal to the conducting voltage of the second switch unit 205, so that the controller MCU can be guaranteed to output a high level, and the voltage across the capacitor C1 is equal to zero, so as to control smooth conduction of the second switch unit 205.

In one embodiment, the relay 202 is a dc relay, and the power source 201 is a dc voltage source VCC.

Referring to fig. 3, in the present embodiment, the relay 202 is provided as a dc relay K1, the power supply 201 is a dc voltage source VCC, the driving current of the relay 202 provided in fig. 3 is set according to the dc relay K1, and in general, the pull-in voltage of the dc relay K1 is not greater than 80% of its rated voltage, and the pull-in voltage of the ac relay is not greater than 85% of its rated voltage; the holding voltage of the dc relay K1 is typically 30% -40% of the rated voltage, the holding voltage of the ac relay will be larger, if the relay 202 is an ac relay, the power source 201 will be an ac voltage source correspondingly, and the driving circuit where the ac relay is located can be set according to the characteristics of the ac relay.

For example, in the following, a detailed description of a relay driving circuit provided in this embodiment will be described with reference to fig. 3, in which the first switch unit 204 and the second switch unit 205 in fig. 3 are all transistors, the relay 202 is a dc relay K1, and the power supply 201 is a dc voltage source VCC.

Firstly, when the relay 202 is not operated, it is in an unabsorbed state, at this time, the MCU outputs a high level, since the voltages at the two ends of the capacitor C1 cannot be suddenly changed, and the voltages at the two ends of the capacitor C1 are equal to zero, at this time, the two ends of the capacitor C1 are in a short-circuited state, then the high level enters the first switch unit 204 and the second switch unit 205 respectively, at this time, then a control loop formed by the MCU: MCU- & gt first resistor R1- & gt first switch unit 204, MCU- & gt first resistor R1- & gt capacitor C1- & gt third resistor R3- & gt second switch unit 205 is conducted, at the moment, the first switch unit 204 and the second switch unit 205 are in a conducting state, the voltage dividing resistor R is in a bypass state, at the moment, a loop consisting of a direct current voltage source VCC- & gt direct current relay K1- & gt first switch unit 204- & gt second switch unit 205- & gt GND is conducted, the relay 202 is in suction, the saturated voltage drop of the first switch unit 204 and the second switch unit 205 is ignored, the suction voltage output by the power supply 201 is all loaded on the coil of the relay 202, so that suction current meeting the suction requirement is generated, and at the moment, the relay 202 enters into a suction state. At the same time, the capacitor C1 is charged through the third resistor R3 and the fourth resistor R4.

When the capacitor C1 is charged, the relay 202 is already in the pull-in state, and at this time, both ends of the capacitor C1 are in an open state, the control loop of mcu→the first resistor r1→the capacitor C1→the third resistor r3→the second switch unit 205 is turned off, and only the control loop of mcu→the first resistor r1→the first switch unit 204 is turned on, and at this time, the loop consisting of the direct current voltage source vcc→the direct current relay k1→the first switch unit 204→the voltage dividing resistor r→gnd is turned on, and because the voltage dividing resistor R is connected in series, the current (holding current) in the loop is reduced compared with that of the relay 202 when the relay is just pulled in, so long as the proper resistance value of the voltage dividing resistor R is selected to enable the control loop to meet the requirements, and the purposes of reducing the energy consumption and the heating value of the direct current relay K1 can be achieved.

Based on the same conception, the embodiment also provides an electronic device, which comprises the relay driving circuit according to the first aspect of the embodiment of the application.

Based on the same conception, the present embodiment also provides a vehicle, which includes the relay driving circuit according to the first aspect of the embodiment of the present application, or the electronic device according to the second aspect of the embodiment of the present application. In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the utility model.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or terminal device comprising the element.

The above description of the relay driving circuit, the electronic device and the vehicle provided by the utility model applies specific examples to illustrate the principle and the implementation of the utility model, and the above examples are only used for helping to understand the core ideas of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. A relay driving circuit, characterized in that the relay driving circuit comprises: a power supply, a relay, a control module, a first switch unit, a second switch unit and a voltage dividing unit;

The first output end of the control module is connected to the first input end of the first switch unit, the second output end of the control module is connected to the first input end of the second switch unit, the second input end of the first switch unit is connected to the first end of the relay, and the output end of the first switch unit is respectively connected to the second input end of the second switch unit and the first end of the voltage dividing unit;

The second end of the relay is connected to the power supply, and the output end of the second switch unit and the second end of the voltage dividing unit are connected to the ground end respectively;

The control module is used to control the first switch unit and the second switch unit to be turned on during a target time period, so that the power supply outputs a pull-in voltage to control the relay to be converted from a non-pull-in state to a pull-in state;

And after the target time period, the first switch unit is controlled to be turned on and the second switch unit is controlled to be turned off, so that the power supply output maintains the voltage to control the relay to maintain the energized state; wherein the energized voltage is greater than the holding voltage.

2. The relay drive circuit according to claim 1 is characterized in that the control module comprises: a controller and a capacitor; wherein the output end of the controller is respectively connected to the first input end of the first switch unit and the first end of the capacitor, and the second end of the capacitor is connected to the first input end of the second switch unit.

3. The relay drive circuit according to claim 2 is characterized in that the control module also includes: a first resistor and a second resistor; wherein the first end of the first resistor is connected to the output end of the controller, the second end of the first resistor is respectively connected to the first input end of the first switch unit, the first end of the capacitor and the first end of the second resistor, and the second end of the second resistor is connected to the ground end.

4. The relay drive circuit according to claim 3 is characterized in that the control module also includes: a third resistor and a fourth resistor; wherein the first end of the third resistor and the first end of the fourth resistor are respectively connected to the second end of the capacitor, the second end of the fourth resistor is connected to the first input end of the second switch unit, and the second end of the third resistor is connected to the ground end.

5 . The relay driving circuit according to claim 1 , further comprising: a diode; wherein the diode is connected in parallel at both ends of the relay.

6 . The relay driving circuit according to claim 1 , wherein the first switch unit and the second switch unit are triodes or MOS tubes.

7. The relay drive circuit according to claim 4 is characterized in that the voltage of the second resistor is greater than or equal to the on-voltage of the first switch unit, and the voltage difference between the third resistor and the fourth resistor is greater than or equal to the on-voltage of the second switch unit.

8 . The relay drive circuit according to claim 1 , wherein the relay is a DC relay and the power supply is a DC voltage source.

9. An electronic device, characterized in that the electronic device comprises the relay drive circuit according to any one of claims 1 to 8.

10. A vehicle, characterized in that the vehicle comprises the relay drive circuit according to any one of claims 1 to 8, or the electronic device according to claim 9.