Magnetic latching relay drive circuit and energy storage power supply

Abstract

The utility model relates to the technical field of relay control, in particular to a magnetic latching relay driving circuit and an energy storage power supply. The circuit comprises an auxiliary power supply, an energy storage module and a driving module, a first end of the auxiliary power supply is connected to a first end of the energy storage module and a power supply end of a coil, and a control end of the coil is connected to a second end of the energy storage module and a second end of the auxiliary power supply through the driving module; the auxiliary power supply charges the energy storage module and supplies power to the coil when being powered on; the energy storage module supplies power to a coil of the magnetic latching relay when the auxiliary power supply is powered down; and the driving module outputs a driving signal to a coil of the magnetic latching relay so as to control the magnetic latching relay to be switched on or switched off. According to the circuit, the energy storage module is arranged to store energy when the auxiliary power supply is powered on, so that the auxiliary power supply and the energy storage module can jointly supply power when the magnetic latching relay acts, and therefore, when the auxiliary power supply is accidentally powered down, the energy storage module can also provide enough energy for the magnetic latching relay, and the magnetic latching relay can be normally turned off.

Description

Technical Field

[0001] This application relates to the field of relay control technology, specifically to a magnetic latching relay drive circuit and energy storage power supply. Background Technology

[0002] With the increasing popularity of photovoltaic power generation, energy storage systems, and electric vehicles, household electricity usage demands are becoming more diversified, leading to higher requirements for intelligent power management. As a power management device, the importance of intelligent distribution cabinets is becoming increasingly prominent. Intelligent distribution cabinets typically require multiple relays to achieve intelligent control of input and output power. Ordinary relays are generally used to control the output / input of each branch, while magnetic latching relays control the mains input. The switching state transition of a magnetic latching relay is usually triggered by a pulse signal of a certain width. When the contacts are in the holding state, no further energization is required; the magnetic force of the permanent magnet is sufficient to maintain the relay's state. This design features energy saving, stable performance, small size, and high load capacity. However, the power required to drive a magnetic latching relay is generally much greater than that required by an ordinary relay. Therefore, the drive power of the flyback auxiliary power supply used to drive the magnetic latching relay usually needs to be sufficiently large. However, greater drive power means a larger transformer size and subjectes components to greater electrical and thermal stress. In addition, to ensure that the auxiliary power supply can be maintained for a sufficient time after the AC input power is lost, so that the microcontroller (MCU) can send control signals to drive the magnetic latching relay to turn off normally and store event records to report to the remote server, a sufficiently large filter capacitor is usually set after the rectifier bridge to store more energy. However, a larger capacitor not only increases the cost, but also takes up more space. Utility Model Content

[0003] The embodiments of this application mainly address the technical problems of existing magnetic latching relay drive circuits requiring high drive power flyback auxiliary power supplies, which result in high cost and space requirements.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a magnetic latching relay drive circuit, wherein the magnetic latching relay includes a coil, the circuit includes an auxiliary power supply, an energy storage module, and a drive module, a first terminal of the auxiliary power supply is connected to a first terminal of the energy storage module and a power supply terminal of the coil, and a control terminal of the coil is connected to a second terminal of the energy storage module and a second terminal of the auxiliary power supply through the drive module; the auxiliary power supply is used to charge the energy storage module and supply power to the coil of the magnetic latching relay when powered on; the energy storage module is used to supply power to the coil of the magnetic latching relay when the auxiliary power supply is powered off; the drive module is used to output a drive signal to the coil of the magnetic latching relay to control the magnetic latching relay to turn on or off.

[0005] In some embodiments, the energy storage module is a supercapacitor.

[0006] In some embodiments, a constant current charging module is further included; a first end of the constant current charging module is connected to the auxiliary power supply, and a second end of the constant current charging module is connected to the first end of the energy storage module; the constant current charging module is used to limit the output current value of the auxiliary power supply to be less than or equal to a preset threshold, so that the auxiliary power supply charges the energy storage module with a constant current and supplies power to the coil of the magnetic latching relay.

[0007] In some embodiments, the constant current charging module includes a MOSFET M1, a resistor R1, and an amplifier U1; the first terminal of the MOSFET M1 is connected to the first terminal of the auxiliary power supply, the second terminal of the MOSFET M1 is connected to the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected to the first terminal of the energy storage module; the first input terminal of the amplifier U1 is connected to the first terminal of the resistor R1, the second input terminal of the amplifier U1 is connected to the second terminal of the resistor R1, the second input terminal of the amplifier U1 is also used to receive a reference voltage, and the output terminal of the amplifier U1 is connected to the control terminal of the MOSFET M1.

[0008] In some embodiments, the constant current charging module is further connected to a pull-up power supply, which is connected to the second input terminal of the amplifier U1 and is used to provide a reference voltage; the power-on state of the pull-up power supply is the same as the power-on state of the auxiliary power supply.

[0009] In some embodiments, the magnetic latching relay includes a first coil and a second coil, and the driving module includes a first driving unit and a second driving unit. The power supply terminals of the first coil and the second coil are connected to a first terminal of the energy storage module. The control terminal of the first coil is connected to a second terminal of the energy storage module through the first driving unit, and the control terminal of the second coil is connected to a second terminal of the energy storage module through the second driving unit. The first driving unit is used to control the energy storage module to output voltage to the first coil when a control signal is received, so as to make the magnetic latching relay engage. The second driving switch is used to control the energy storage module to output voltage to the second coil when a control signal is received, so as to make the magnetic latching relay disengage.

[0010] In some embodiments, the first driving unit is a first driving switch, which is turned on when a control signal is received, so that the energy storage module supplies power to the first coil; the second driving unit is a second driving switch, which is turned on when a control signal is received, so that the energy storage module supplies power to the second coil.

[0011] In some embodiments, the circuit further includes a controller for providing control signals to the first drive unit or to the second drive unit.

[0012] In some embodiments, the first driving switch is a switching transistor Q1, the first end of which is connected to the control terminal of the first coil, the second end of which is connected to the second terminal of the energy storage module, and the control terminal of which is used to receive the control signal; the second driving switch is a switching transistor Q2, the first end of which is connected to the control terminal of the second coil, the second end of which is connected to the second terminal of the energy storage module, and the control terminal of which is used to receive the control signal.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an energy storage power supply, including the magnetic latching relay drive circuit as described above.

[0014] Unlike related technologies, this application provides a magnetic latching relay drive circuit and energy storage power supply. The circuit includes an auxiliary power supply, an energy storage module, and a drive module. A first terminal of the auxiliary power supply is connected to a first terminal of the energy storage module and the power supply terminal of the coil. The control terminal of the coil is connected via the drive module to a second terminal of the energy storage module and a second terminal of the auxiliary power supply. The auxiliary power supply is used to charge the energy storage module and supply power to the coil of the magnetic latching relay when powered on. The energy storage module is used to supply power to the coil of the magnetic latching relay when the auxiliary power supply fails. The drive module outputs a drive signal to the coil of the magnetic latching relay to control the magnetic latching relay to turn on or off. This circuit, by configuring the energy storage module to store energy when the auxiliary power supply is powered on, allows the magnetic latching relay to be powered jointly by the auxiliary power supply and the energy storage module when the coil triggers the relay. Therefore, even if the auxiliary power supply fails unexpectedly, the energy storage module can still provide sufficient energy to the magnetic latching relay to ensure its normal shutdown. Attached Figure Description

[0015] Figure 1 This is a schematic block diagram of a magnetic latching relay drive circuit provided in an embodiment of this application;

[0016] Figure 2 This is a schematic block diagram of another magnetic latching relay drive circuit provided in the embodiments of this application;

[0017] Figure 3 This is a schematic diagram of the circuit structure of a magnetic latching relay driving circuit provided in an embodiment of this application. Detailed Implementation

[0018] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "first," "second," etc., used in this specification are for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0019] This application provides a magnetic latching relay drive circuit for supplying power to the coil of the magnetic latching relay, so that the magnetic latching relay is turned on or off according to a drive signal. Please refer to... Figure 1 , Figure 1 This is a schematic block diagram of a magnetic latching relay drive circuit provided in an embodiment of this application.

[0020] like Figure 1 As shown, the magnetic latching relay drive circuit 100 is connected to the coil 21 of the magnetic latching relay 20. The magnetic latching relay drive circuit 100 includes an auxiliary power supply 11, an energy storage module 12, and a drive module 13. The first end of the auxiliary power supply 11 is connected to the first end of the energy storage module 12 and the power supply end of the coil 21. The control end of the coil 21 is connected to the second end of the energy storage module 12 and the second end of the auxiliary power supply 11 through the drive module 13.

[0021] Specifically, the auxiliary power supply 11 is used to charge the energy storage module 12 and supply power to the coil 21 of the magnetic latching relay 20 when the power is on; the energy storage module 12 supplies power to the coil 21 of the magnetic latching relay 20 when the auxiliary power supply 11 is off; the drive module 13 is used to output a drive signal to the coil 21 of the magnetic latching relay 20 to control the magnetic latching relay 20 to turn on or off.

[0022] The drive signal is the signal that triggers the magnetic latching relay to operate, such as a pulse electrical signal of a certain width. In this circuit, the drive module 13 controls the magnetic latching relay 20 to turn on or off by outputting the drive signal. During this process, the auxiliary power supply 11 or the energy storage module 12 provides sufficient power to the coil 21. When the auxiliary power supply 11 is powered on, it charges the energy storage module 12. When the coil 21 triggers the magnetic latching relay 20 to operate, the auxiliary power supply 11 and the energy storage module 12 can provide power together. If the auxiliary power supply 11 fails to power, the energy storage module 12 can act as a backup power source, providing energy to the coil 21 of the magnetic latching relay 20 for a period of time, so that the magnetic latching relay 20 can be normally turned off based on the control of the drive signal.

[0023] In some embodiments, the energy storage module 12 can be a supercapacitor. Utilizing the high energy density of the supercapacitor, it can store a large amount of electrical energy when the auxiliary power supply 11 is powered on. Combined with its fast charging and discharging speed, it can quickly supply power to the coil 21 of the magnetic latching relay 20 when the auxiliary power supply 11 is powered off, protecting the normal turn-off process of the magnetic latching relay 20 and reducing failures caused by the sudden power failure of the auxiliary power supply 11.

[0024] Please combine Figure 2 In some embodiments, the magnetic latching relay drive circuit 100 further includes a constant current charging module 14, such as... Figure 2 As shown, the first end of the constant current charging module 14 is connected to the auxiliary power supply 11, and the second end of the constant current charging module 14 is connected to the first end of the energy storage module 12. The constant current charging module 14 can limit the output current of the auxiliary power supply 11 to be less than a preset threshold, so that when the auxiliary module 11 is working normally, it charges the energy storage module 12 with a constant current and supplies power to the coil 21.

[0025] For specific details, please refer to... Figure 3 The constant current charging module 14 includes a MOSFET M1, a resistor R1, and an amplifier U1; the energy storage module 12 is a supercapacitor C1. The first terminal of the MOSFET M1 is connected to the first terminal of the auxiliary power supply 11, and the second terminal of the MOSFET M1 is connected to the first terminal of the resistor R1. The second terminal of the resistor R1 is connected to the first terminal of the energy storage module 12. The first input terminal of the amplifier U1 is connected to the first terminal of the resistor R1, and the second input terminal of the amplifier U1 is connected to the second terminal of the resistor R1. The second input terminal of the amplifier U1 also receives a reference voltage Vref. The output terminal of the amplifier U1 is connected to the control terminal of the MOSFET M1. The amplifier U1 is powered by the power supply VCC.

[0026] Assume the resistance of resistor R1 is denoted as R0, and the preset threshold can be Vref / R0. When the auxiliary power supply 11 is working normally, if the output current i of the auxiliary power supply 11 is greater than the preset threshold, that is, the current i flowing through resistor R1 is greater than Vref / R0, the potential of the first input terminal of amplifier U1 is higher than the potential of its second input terminal, then the voltage at the output terminal of amplifier U1 decreases, thereby reducing the voltage at the control terminal of MOSFET M1, that is, reducing Vgs of MOSFET M1, and thus reducing the value of the control current i; if the output current i of the auxiliary power supply 11 is less than the preset threshold, that is, the current i flowing through resistor R1 is less than Vref / R0, the potential at the first input terminal of amplifier U1 is lower than the potential of its second input terminal, then the voltage at the output terminal of amplifier U1 increases, thereby increasing the voltage at the control terminal of MOSFET M1, that is, increasing Vgs of MOSFET M1, and thus increasing the value of the control current i. Based on this, the constant current charging module 14 can limit the output current value of the auxiliary power supply 11 to be maintained near Vref / R0, and the current i can be adjusted by controlling the resistance value of the control resistor R1 or the voltage value of the reference voltage Vref, so that the output current i is suitable for practical application scenarios.

[0027] Therefore, the magnetic latching relay drive circuit 100 provided in this solution can limit the output current value of the auxiliary power supply 11 through the constant current charging module 14, so that it charges the energy storage module 12 and supplies power to the coil 21 with a constant current less than or equal to a preset threshold. It is understood that, taking the supercapacitor C1 as an example, after the auxiliary power supply 11 is powered on, it can be fully charged in a short time. When the magnetic latching relay 20 operates, the auxiliary power supply 11, in conjunction with the supercapacitor C1, supplies power to the coil 21. At this time, due to the current limiting effect of the constant current charging module 14, the current value obtained by the coil 21 from the auxiliary power supply 11 during operation is limited. Therefore, when the magnetic latching relay 21 operates, most of the energy required by its coil 21 can be obtained from the supercapacitor C1. Based on this, combined with the large capacity characteristic of the supercapacitor C1, a relatively small power auxiliary power supply 11 can be used to drive the relatively high power demand of the magnetic latching relay 20. Furthermore, due to the large capacity of the supercapacitor C1, if the auxiliary power supply 11 experiences an abnormal power outage, such as a sudden loss of its AC input, the energy stored in the supercapacitor C1 is sufficient to maintain power supply to the coil 21 for a period of time, enabling the magnetic latching relay 20 to be turned off normally. This improves the safety of the circuit and prevents the magnetic latching relay from failing to turn off normally due to an abnormal power outage of the auxiliary power supply 11.

[0028] In some embodiments, the constant current charging module 14 obtains the reference voltage Vref by connecting a pull-up power supply. Specifically, please refer to... Figure 3A pull-up power supply is connected to the second input terminal of amplifier U1 to provide a reference voltage Vref to the second input terminal of amplifier U1. In some embodiments, the power-on state of the pull-up power supply is the same as that of the auxiliary power supply. For example, the pull-up power supply and the auxiliary power supply can be powered by the same AC input. When the auxiliary power supply is powered on, the pull-up power supply is powered on and provides a reference voltage to amplifier U1; when the auxiliary power supply is powered off, the pull-up power supply is also powered off and stops providing the reference voltage.

[0029] In some embodiments, please combine Figure 3 The coil 21 of the magnetic latching relay 20 includes a first coil RLY_L1 and a second coil RLY_L2. The drive module 13 includes a first drive unit 131 and a second drive unit 132. The power supply terminals (+ terminals of coil 21 in the figure) of the first coil RLY_L1 and the second coil RLY_L2 are connected to the first terminal of the energy storage module 12. The control terminal (- terminal of RLY_L1 in the figure) of the first coil RLY_L1 is connected to the second terminal of the energy storage module 12 through the first drive unit 131. The control terminal (- terminal of RLY_L2 in the figure) of the second coil RLY_L2 is connected to the second terminal of the energy storage module 12 through the second drive unit 132.

[0030] When the first drive unit 131 receives a control signal, it controls the energy storage module 12 to output a drive signal to the first coil RLY_L1, causing the magnetic latching relay 20 to engage. When the second drive unit 132 receives a control signal, it controls the energy storage module 12 to output a drive signal to the second coil RLY_L2, causing the magnetic latching relay 20 to disengage. Based on this, the magnetic latching relay drive circuit provided in this solution uses different drive units for the on and off actions of the magnetic latching relay. When it is necessary to control the magnetic latching relay, the corresponding drive unit can be directly controlled by the control signal to achieve the on and off actions of the magnetic latching relay. During this process, the large-capacity supercapacitor C1 can provide sufficient energy to the coil 21 of the magnetic latching relay, reducing the impact of abnormal power failure of the auxiliary power supply 11 on the operation of the magnetic latching relay.

[0031] In some embodiments, the first driving unit 131 is a first driving switch, and the second driving unit 132 is a second driving switch. Specifically, the first driving switch is turned on when a control signal is received, so that the energy storage module 12 supplies power to the first coil RLY_L1; the second driving switch is turned on when a control signal is received, so that the energy storage module 12 supplies power to the second coil RLY_L2. The aforementioned first driving switch or second driving switch can be a switching device such as a switching transistor or a relay, and when a control signal is received, it controls the energy storage module 12, i.e., the supercapacitor C1, to turn on the power supply circuit to the corresponding coil 21.

[0032] Taking the switching transistor as an example, the first driving switch is the switching transistor Q1 (not shown in the figure). The first end of the switching transistor Q1 is connected to the control terminal of the first coil RLY_L1, and the second end of the switching transistor Q1 is connected to the second terminal of the energy storage module 12, that is... Figure 3 The second terminal of the supercapacitor C1, the control terminal of the switching transistor Q1, is used to receive control signals. The second drive switch is a switching transistor Q2 (not shown in the figure). The first terminal of the switching transistor Q2 is connected to the control terminal of the second coil, and the second terminal of the switching transistor Q2 is connected to the second terminal of the energy storage module 12. The control terminal of the switching transistor Q2 is used to receive control signals.

[0033] Specifically, when the control terminal of switch Q1 receives a control signal, switch Q1 is turned on, thereby electrically connecting the second terminal of supercapacitor C1 to the control terminal of the first coil RLY_L1 through switch Q1. At the same time, the first terminal of supercapacitor C1 is electrically connected to the power supply terminal of the first coil RLY_L1, thus controlling supercapacitor C1 to output voltage to the first coil RLY_L1 through switch Q1. This is equivalent to the first drive unit 131 outputting a drive signal to the first coil, causing the magnetic latching relay 20 to engage. When the control terminal of switch Q2 receives a control signal, switch Q2 is turned on, thereby electrically connecting the second terminal of supercapacitor C1 to the control terminal of the second coil RLY_L2 through switch Q2. At the same time, the first terminal of supercapacitor C1 is electrically connected to the power supply terminal of the second coil RLY_L2, thus controlling supercapacitor C1 to output voltage to the second coil RLY_L2 through switch Q2. This is equivalent to the second drive unit 132 outputting a drive signal to the second coil, causing the magnetic latching relay 20 to disengage.

[0034] In some embodiments, please combine Figure 2 The magnetic latching relay drive circuit 100 also includes a controller 15, which can provide control signals to the first drive unit 131, or to the second drive unit 132. (Please refer to...) Figure 3 The controller 15 can be a control chip U2 with signal output function. The control chip U2 achieves the engagement or disengagement of the magnetic latching relay 20 by outputting control signals to the first drive unit 131 or the second drive unit 132. It is understood that for the drive module 13, the first drive switch and the second drive switch cannot be turned on simultaneously; that is, the controller 15 cannot simultaneously provide control signals to the first drive switch and the second drive switch. Therefore, when the magnetic latching relay needs to be engaged, the controller 15 can output a control signal to the first drive switch to turn it on; when the magnetic latching relay needs to be disengaged, the controller 15 can output a control signal to the second drive switch to turn it on; when the magnetic latching relay is not needed, the controller 15 stops providing control signals.

[0035] Therefore, the magnetic latching relay drive circuit provided in this application provides energy storage module to store energy when the auxiliary power supply is powered on, so that when the coil triggers the magnetic latching relay to operate, it can be powered by both the auxiliary power supply and the energy storage module. Thus, when the auxiliary power supply fails unexpectedly, the energy storage module can also provide enough energy to the magnetic latching relay to enable it to turn off normally, thereby improving the stability and safety of the circuit.

[0036] This application provides an energy storage power supply, which includes the magnetic latching relay drive circuit described in the above embodiments. The energy storage power supply of this embodiment includes all the technical features of the magnetic latching relay drive circuit described in the above embodiments and possesses the corresponding beneficial effects. Technical details not described in detail in this embodiment can be found in the magnetic latching relay drive circuit provided in this invention.

[0037] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A magnetic latching relay drive circuit, characterized in that, The magnetic latching relay includes a coil, and the circuit includes an auxiliary power supply, an energy storage module, and a drive module. The first terminal of the auxiliary power supply is connected to the first terminal of the energy storage module and the power supply terminal of the coil. The control terminal of the coil is connected to the second terminal of the energy storage module and the second terminal of the auxiliary power supply through the drive module. The auxiliary power supply is used to charge the energy storage module and supply power to the coil of the magnetic latching relay when powered on; The energy storage module is used to supply power to the coil of the magnetic latching relay when the auxiliary power supply fails; The drive module is used to output a drive signal to the coil of the magnetic latching relay to control the magnetic latching relay to turn on or off.

2. The magnetic latching relay drive circuit according to claim 1, characterized in that, The energy storage module is a supercapacitor.

3. The magnetic latching relay drive circuit according to claim 1, characterized in that, It also includes a constant current charging module; the first end of the constant current charging module is connected to the auxiliary power supply, and the second end of the constant current charging module is connected to the first end of the energy storage module; The constant current charging module is used to limit the output current value of the auxiliary power supply to be less than or equal to a preset threshold, so that the auxiliary power supply charges the energy storage module with a constant current and supplies power to the coil of the magnetic latching relay.

4. The magnetic latching relay drive circuit according to claim 3, characterized in that, The constant current charging module includes a MOSFET M1, a resistor R1, and an amplifier U1; The first terminal of the MOSFET M1 is connected to the first terminal of the auxiliary power supply, the second terminal of the MOSFET M1 is connected to the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected to the first terminal of the energy storage module; the first input terminal of the amplifier U1 is connected to the first terminal of the resistor R1, the second input terminal of the amplifier U1 is connected to the second terminal of the resistor R1, the second input terminal of the amplifier U1 is also used to receive a reference voltage, and the output terminal of the amplifier U1 is connected to the control terminal of the MOSFET M1.

5. The magnetic latching relay drive circuit according to claim 4, characterized in that, The constant current charging module is also connected to a pull-up power supply, which is connected to the second input terminal of the amplifier U1 to provide a reference voltage. The power-on state of the pull-up power supply is the same as that of the auxiliary power supply.

6. The magnetic latching relay drive circuit according to claim 1, characterized in that, The magnetic latching relay includes a first coil and a second coil. The driving module includes a first driving unit and a second driving unit. The power supply terminals of the first coil and the second coil are connected to the first terminal of the energy storage module. The control terminal of the first coil is connected to the second terminal of the energy storage module through the first driving unit. The control terminal of the second coil is connected to the second terminal of the energy storage module through the second driving unit. The first driving unit is used to control the energy storage module to output voltage to the first coil when a control signal is received, so as to make the magnetic latching relay engage; The second drive unit is used to control the energy storage module to output voltage to the second coil when a control signal is received, so as to disconnect the magnetic latching relay.

7. The magnetic latching relay drive circuit according to claim 6, characterized in that, The first driving unit is a first driving switch, which is turned on when a control signal is received, so that the energy storage module supplies power to the first coil; The second driving unit is a second driving switch, which is turned on when a control signal is received, so that the energy storage module supplies power to the second coil.

8. The magnetic latching relay drive circuit according to claim 6, characterized in that, The circuit further includes a controller, which is used to provide control signals to the first drive unit or to the second drive unit.

9. The magnetic latching relay drive circuit according to claim 7, characterized in that, The first drive switch is a switching transistor Q1. The first end of the switching transistor Q1 is connected to the control terminal of the first coil, and the second end of the switching transistor Q1 is connected to the second terminal of the energy storage module. The control terminal of the switching transistor Q1 is used to receive the control signal. The second drive switch is a switching transistor Q2. The first end of the switching transistor Q2 is connected to the control terminal of the second coil, and the second end of the switching transistor Q2 is connected to the second terminal of the energy storage module. The control terminal of the switching transistor Q2 is used to receive the control signal.

10. An energy storage power source, characterized in that, Includes the magnetic latching relay drive circuit as described in any one of claims 1-9.

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