Relay control circuit, battery management device, battery pack and power-consuming equipment

Abstract

A relay control circuit comprises a relay, a controller and a first power supply, wherein the relay control circuit further comprises a controlled module; the coils of the controlled module and the relay are connected in series between the first power supply and the ground, and the controlled module is electrically connected to the controller; the controlled module is configured as follows: in response to the first power supply supplying power to the relay to drive the relay to work, the controlled module has a first impedance, and in response to the relay maintaining a working state, the controlled module has a second impedance; wherein the first impedance is smaller than the second impedance.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic circuit technology, and in particular to a relay control circuit, a battery management device, a battery pack and an electrical device. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. In fact, it is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. The working principle of the relay is based on electromagnetic induction. When a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating a magnetic field. This magnetic field magnetizes the iron core and attracts the armature, which in turn drives the contact to connect or disconnect the circuit. When the coil is powered off, the magnetic field disappears, the armature returns to its original position under the action of the reset spring, and the contacts also return to their initial state. Summary of the invention

[0003] The embodiments of the present application provide a relay control circuit, a battery management device, a battery pack and an electrical device, which can not only improve the reliability and stability of the relay operation, but also reduce the risk of the relay being damaged.

[0004] In a first aspect, an embodiment of the present application provides a relay control circuit, comprising a relay, a controller and a first power supply, the relay control circuit also comprising a controlled module; the coil of the controlled module and the relay is connected in series between the first power supply and the ground, and the controlled module is electrically connected to the controller; the controlled module is configured to: in response to the first power supply supplying power to the relay to drive the relay to work, the controlled module has a first impedance, and in response to the relay maintaining a working state, the controlled module has a second impedance; wherein the first impedance is less than the second impedance.

[0005] When driving the relay to work, a smaller first impedance is used so that the voltage of the first power supply has a larger voltage division on the relay coil. Driving the relay to work by a larger voltage is beneficial to improving the reliability and stability of the relay operation. When the relay maintains a working state, a larger second impedance is used, and the voltage of the first power supply has a smaller voltage division on the relay coil, which is beneficial to reducing the risk of damage to the relay.

[0006] In one or more embodiments, the controlled module includes a first controlled module and a second controlled module, and the first controlled module is connected in parallel with the second controlled module; the first controlled module includes a first switch unit and a first voltage divider unit, and the first switch unit, the first voltage divider unit and the coil of the relay are connected in series between the first power supply and the ground, and the controller is electrically connected to the first switch unit; the second controlled module includes a second switch unit and a second voltage divider unit, and the second switch unit, the second voltage divider unit and the coil of the relay are connected in series between the first power supply and the ground, and the controller is electrically connected to the second switch unit.

[0007] In one or more embodiments, the controlled module includes a delay unit; the first end of the delay unit is electrically connected to the controller, and the second end of the delay unit is electrically connected to the second switch unit; the delay unit is configured to control the second switch unit to turn off after the second switch unit is turned on for a first period of time.

[0008] In one or more embodiments, the delay unit includes a first capacitor.

[0009] In one or more embodiments, the controlled module includes a third controlled module; the third controlled module includes a third switch unit, a third voltage divider unit and an energy storage unit, and the third switch unit, the third voltage divider unit and the coil of the relay are connected in series between the first power supply and the ground; the third voltage divider unit is connected in parallel with the energy storage unit, and the controller is electrically connected to the third switch unit.

[0010] In one or more embodiments, the energy storage unit includes a second capacitor.

[0011] In one or more embodiments, any switch unit in the controlled module includes a first switch and a first resistor; the first end of the first switch is electrically connected to the controller, the third end of the first switch is grounded, and the first resistor is arranged between the first end of the first switch and the third end of the first switch; the first switch satisfies one of the following conditions: i) any switch unit in the controlled module is the first switch unit or the second switch unit, and the second end of the first switch is electrically connected to the corresponding voltage divider unit; ii) any switch unit in the controlled module is the third switch unit, and the second end of the first switch is electrically connected to the corresponding voltage divider unit or the coil of the relay.

[0012] In one or more embodiments, the first switch includes an N-type FET or an NPN-type transistor; the first end of the first switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the first switch is the drain of the N-type FET or the collector of the NPN-type transistor, and the third end of the first switch is the source of the N-type FET or the emitter of the NPN-type transistor.

[0013] In one or more embodiments, the relay control circuit includes a second power supply; any switch unit in the controlled module includes a second switch, a third switch and a fourth switch; the second switch is electrically connected to the controller, the second switch and the third switch are connected in series between the second power supply and the ground, the second power supply is electrically connected to the fourth switch through the third switch, and the fourth switch is connected in series with the corresponding voltage divider unit and the coil of the relay between the first power supply and the ground; the second switch, the third switch and the fourth switch are configured to perform the following operations: in response to the first control signal of the controller, the second switch is turned on; in response to the second switch being turned on, the third switch is turned on and the fourth switch is turned on.

[0014] In one or more embodiments, the second switch is an N-type FET or an NPN-type transistor, the first end of the second switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the second switch is the drain of the N-type FET or the collector of the PNP-type transistor, and the third end of the second switch is the source of the N-type FET or the emitter of the NPN-type transistor; the third switch is a P-type FET or a PNP-type transistor, the first end of the third switch is the gate of the P-type FET or the base of the PNP-type transistor, the second end of the third switch is the drain of the P-type FET or the collector of the NPN-type transistor, and the third end of the third switch is the source of the P-type FET or the emitter of the NPN-type transistor; The four switches are N-type FETs or NPN-type transistors, the first end of the fourth switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the fourth switch is the drain of the N-type FET or the collector of the NPN-type transistor, and the third end of the fourth switch is the source of the N-type FET or the emitter of the NPN-type transistor; the third switch unit also includes a second resistor, a third resistor, a fourth resistor and a fifth resistor; the second resistor is arranged between the controller and the first end of the second switch, the third resistor is arranged between the first end of the second switch and the ground, the fourth resistor is arranged between the second end of the second switch and the first end of the third switch, and the fifth resistor is arranged between the first end of the third switch and the third end of the third switch.

[0015] In one or more embodiments, any switch unit in the controlled module includes a fifth switch and a sixth switch; the first end of the fifth switch is electrically connected to the controller, the second end of the fifth switch is electrically connected to the first end of the sixth switch, and the third end of the fifth switch is grounded; the sixth switch satisfies one of the following conditions: i) the second end of the sixth switch is connected to the corresponding voltage divider unit, and the third end of the sixth switch is electrically connected to the first power supply or is electrically connected to the first power supply through the coil of the relay; ii) the second end of the sixth switch is connected to the coil of the relay, and the third end of the sixth switch is electrically connected to the first power supply or is electrically connected to the first power supply through the corresponding voltage divider unit; the fifth switch and the sixth switch are configured to perform the following operations: in response to the second control signal of the controller, the fifth switch is turned on; in response to the fifth switch being turned on, the sixth switch is turned on.

[0016] In one or more embodiments, the fifth switch is an N-type FET or an NPN-type transistor, the first end of the fifth switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the fifth switch is the drain of the N-type FET or the collector of the NPN-type transistor, and the third end of the fifth switch is the source of the N-type FET or the emitter of the NPN-type transistor; the sixth switch is a P-type FET or a PNP-type transistor, the first end of the sixth switch is the gate of the P-type FET or the base of the PNP-type transistor, the second end of the sixth switch is the drain of the P-type FET or the collector of the PNP-type transistor, and the third end of the sixth switch is the source of the P-type FET or the emitter of the PNP-type transistor; any switch unit in the controlled module also includes a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; the sixth resistor is arranged between the controller and the first end of the fifth switch, the seventh resistor is arranged between the first end of the fifth switch and the ground, the eighth resistor is arranged between the second end of the fifth switch and the first end of the sixth switch, and the ninth resistor is arranged between the first end of the sixth switch and the third end of the sixth switch.

[0017] In one or more embodiments, any voltage dividing unit in the controlled module includes at least one resistor and / or at least one voltage stabilizing diode.

[0018] In a second aspect, an embodiment of the present application provides a battery management device, including a relay control circuit as in the first aspect.

[0019] In a third aspect, an embodiment of the present application provides a battery pack, including a battery module and a battery management device as in the second aspect.

[0020] In a fourth aspect, an embodiment of the present application provides an electrical device, including a load and a battery pack as in the third aspect.

[0021] The beneficial effect of the present application is that the relay control circuit of the embodiment of the present application includes a relay, a controller, a first power supply and a controlled module. Among them, the coils of the controlled module and the relay are connected in series between the first power supply and the ground, and the controlled module is electrically connected to the controller. On the one hand, in response to the first power supply supplying power to the relay to drive the relay to work, the controlled module has a first impedance; on the other hand, in response to the relay maintaining a working state, the controlled module has a second impedance; wherein the first impedance is less than the second impedance. Thus, when driving the relay to work, due to the small first impedance, the voltage of the first power supply on the coil of the relay is large, and a large voltage is used to drive the relay to work, so as to improve the reliability and stability of the relay; when the relay maintains a working state, due to the large second impedance, the voltage of the first power supply on the coil of the relay is small, which is conducive to reducing the risk of damage to the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0023] Figure 1 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 2 ;

[0025] Figure 3 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 3 ;

[0026] Figure 4 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 4 ;

[0027] Figure 5 yes Figure 4 A schematic diagram of a first control signal output by a controller to control a first switch unit and a second control signal output to control a second switch unit;

[0028] Figure 6 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 5 ;

[0029] Figure 7 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 6 ;

[0030] Figure 8 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 7 ;

[0031] Fig. 9 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 8 ;

[0032] Fig.10 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 9 ;

[0033] Fig.11 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 10 ;

[0034] Fig.12 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 10 one;

[0035] Fig.13 The embodiment of this application provides Figure 2 , Figure 6-Figure 8 A schematic diagram of the circuit structure of the switch unit in the structure shown;

[0036] Fig.14 The embodiment of this application provides Figure 6 A schematic diagram of the circuit structure of the second switch unit and the delay unit in the structure shown;

[0037] Fig.15 is a schematic diagram of the circuit structure of any switch unit provided in an embodiment of the present application;

[0038] Fig.16 The embodiment of this application provides Figure 3-Figure 4 , Figure 10-12 and Fig.18 A schematic diagram of the circuit structure of the third switch unit in the structure shown;

[0039] Fig.17 is a schematic diagram of the circuit structure of any voltage dividing unit provided in an embodiment of the present application;

[0040] Fig.18 The structure of the relay control circuit provided in the embodiment of the present application is shown in FIG. Figure 10 two. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0043] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0044] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the relay control circuit provided in the embodiment of the present application. Figure 1 As shown, the relay control circuit 100 includes a relay 10 , a controller 20 , a first power source V1 and a controlled module 30 .

[0045] Relay 10 is an electrical control device used to connect or disconnect a circuit. Relay 10 includes a coil L1 and contacts, wherein when coil L1 is energized, a magnetic field is generated to change the state of the contacts; the contacts include at least one pair of normally open contacts and / or at least one pair of normally closed contacts, each pair of normally open contacts includes two contacts (such as contact S11 and contact S12), and each pair of normally closed contacts includes two contacts (such as contact S21 and contact S22). When relay 10 is working, coil L1 is energized, each pair of normally open contacts is closed, and the two contacts in each pair of normally open contacts are short-circuited (such as contact S11 and contact S12 are short-circuited), each pair of normally closed contacts is disconnected, and the two contacts in each pair of normally closed contacts are disconnected (such as contact S21 and contact S22 are disconnected); conversely, when relay 10 is not working, when coil L1 loses power, each pair of normally open contacts is disconnected, and each pair of normally closed contacts is closed.

[0046] The controller 20 may be a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc.

[0047] Specifically, the controlled module 30 and the coil L1 of the relay 10 are connected in series between the first power source V1 and the ground GND. Figure 1 The example in which the coil L1 of the relay 10 and the controlled module 30 are sequentially connected in series between the first power supply V1 and the ground GND is shown as an example. In other embodiments, other series connection methods may also be used. For example, the controlled module 30 and the coil L1 of the relay 10 are sequentially connected in series between the first power supply V1 and the ground GND; for another example, the controlled module 30 includes two parts, namely a first module and a second module. The first module, the coil L1 of the relay 10, and the second module are sequentially connected in series between the first power supply V1 and the ground GND, or the second module, the coil L1 of the relay 10, and the first module are sequentially connected in series between the first power supply V1 and the ground GND.

[0048] The controlled module 30 is electrically connected to the controller 20. The controlled module 30 is controlled by the controller 20 and configured as follows: in response to the first power supply supplying power to the relay to drive the relay to work, the controlled module has a first impedance, and in response to the relay maintaining the working state, the controlled module has a second impedance; wherein the first impedance is less than the second impedance. Specifically, when the driving relay 10 is switched from non-working to working, the controller 20 controls the controlled module 30 to form a loop with the first power supply V1, the coil L1 of the relay 10, the controlled module 30 and the ground GND, and the first power supply V1 supplies power to the coil L1 of the relay 10. At this time, the controlled module 30 has a first impedance. Since the first impedance is small, the voltage of the first power supply V1 on the coil L1 of the relay 10 is large, and at this time, a large voltage is used to drive the relay 10 to work, so as to improve the reliability and stability of the operation of the relay 10. The relay 10 works, so that the contacts of the relay 10 change state, that is, the normally open contacts of the relay 10 change state to closed, and the normally closed contacts of the relay 10 change state to open. After the contact state of the relay 10 is changed, the relay 10 needs to maintain the working state. The controller 20 controls the controlled module 30 to have a second impedance. By increasing the impedance of the controlled module 30, the voltage of the first power supply V1 on the coil L1 of the relay 10 can be reduced. This is beneficial for maintaining the working state of the relay 10 while reducing the power consumption of the coil L1 of the relay 10, so as to reduce the risk of overheating and burning of the relay 10.

[0049] In some embodiments, Figure 2 As shown, the controlled module 30 includes a first controlled module 31 and a second controlled module 32 , and the first controlled module 31 and the second controlled module 32 are connected in parallel.

[0050] The first controlled module 31 includes a first switch unit 311 and a first voltage divider unit 312. The first switch unit 311, the first voltage divider unit 312 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND. In this embodiment, taking the coil L1 of the relay 10, the first voltage divider unit 312 and the first switch unit 311 being connected in series between the first power supply V1 and the ground GND as an example, at this time, the first end P11 of the first switch unit 311 is electrically connected to the first voltage divider unit 312, the second end P12 of the first switch unit 311 is connected to the ground GND, and the third end P13 of the first switch unit 311 is electrically connected to the controller 20. In other embodiments, other series connection methods are adopted, for example, Figure 3As shown, the first voltage dividing unit 312, the first switch unit 311 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND. At this time, the first end P11 of the first switch unit 311 is electrically connected to the first voltage dividing unit 312, the second end P12 of the first switch unit 311 is electrically connected to the coil L1 of the relay 10, and the third end P13 of the first switch unit 311 is electrically connected to the controller 20; or Figure 4 As shown, the first switch unit 311, the first voltage divider unit 312 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND in sequence. At this time, the first end P11 of the first switch unit 311 is electrically connected to the first power supply V1, the second end P12 of the first switch unit 311 is electrically connected to the first voltage divider unit 312, and the third end P13 of the first switch unit 311 is electrically connected to the controller 20.

[0051] Please refer back to Figure 2 , the second controlled module 32 includes a second switch unit 321 and a second voltage divider unit 322. The second switch unit 321, the second voltage divider unit 322 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND, and the controller 20 is electrically connected to the second switch unit 312. In this embodiment, taking the coil L1 of the relay 10, the second voltage divider unit 322 and the second switch unit 321 connected in series between the first power supply V1 and the ground GND as an example, at this time, the first end P21 of the second switch unit 321 is electrically connected to the second voltage divider unit 322, the second end P22 of the second switch unit 321 is grounded GND, and the third end P23 of the second switch unit 321 is electrically connected to the controller 20. In other embodiments, other series connection methods are adopted, for example, Figure 3 As shown, the second voltage dividing unit 322, the second switch unit 321 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND. At this time, the first end P21 of the second switch unit 321 is electrically connected to the second voltage dividing unit 322, the second end P22 of the second switch unit 321 is electrically connected to the coil L1 of the relay 10, and the third end P23 of the second switch unit 321 is electrically connected to the controller 20; or Figure 4As shown, the second switch unit 321, the second voltage dividing unit 322 and the coil L1 of the relay 10 are sequentially connected in series between the first power source V1 and the ground GND. At this time, the first end P21 of the second switch unit 321 is electrically connected to the first power source V1, the second end P22 of the second switch unit 321 is electrically connected to the second voltage dividing unit 322, and the third end P23 of the second switch unit 321 is electrically connected to the controller 20. It can be understood that the series connection mode of the first controlled module 31 and the coil L1 of the relay 10 and the series connection mode of the second controlled module 32 and the coil L1 of the relay 10 can be the same or different. For example, the series connection mode of the first controlled module 31 and the coil L1 of the relay 10 adopts the following method: Figure 3 In the manner shown, the second controlled module 32 and the coil L1 of the relay 10 are connected in series as follows: Figure 4 The method shown.

[0052] Please refer to Figure 4 and Figure 5 , Figure 5 An example is shown Figure 4 The controller 20 outputs a control signal M1 for controlling the first switch unit 311 and a control signal M2 for controlling the second switch unit 321. Specifically, at time T1, the driving relay 10 switches from non-operation to operation, and the control signal M1 and the control signal M2 output by the controller 20 are both high level to control the first switch unit 311 and the second switch unit 321 to be turned on, and the first power supply V1 supplies power to the coil L1 of the relay 10 through the first voltage divider unit 312 and the second voltage divider unit 322 connected in parallel to drive the relay 10 to operate. At the same time, the impedance of the first voltage divider unit 312 and the second voltage divider unit 322 connected in parallel is the first impedance.

[0053] Until time T2, the relay maintains the working state, and the control signal M2 switches from a high level to a low level to control the second switch unit 321 to turn off. Of course, in other embodiments, at this time, only the control signal M1 can be switched from a high level to a low level to control the first switch unit 311 to turn off, that is, the controller 20 controls one of the first switch unit 311 and the second switch unit 312 to turn off. After the second switch unit 321 is turned off, the impedance of the first voltage divider unit 312 is the second impedance. It can be seen that the first impedance is less than the second impedance. Among them, the time length TS1 between time T2 and time T1 is the time length from the start of driving the relay 10 to the contact of the driver 10 changing the state. The time length TS1 can be set according to the actual application scenario, and the embodiment of the present application does not make specific restrictions on this.

[0054] In summary, when driving the relay 10 to work, the voltage divided by the first power supply V1 on the coil L1 of the relay 10 is relatively large, and a relatively large voltage acts on the coil L1 of the relay 10, which can drive the relay 10 to work more reliably and stably; when the relay 10 maintains a working state, the voltage divided by the first power supply V1 on the coil L1 of the relay 10 is relatively small, so that a relatively small voltage acts on the coil L1 of the relay 10, which can reduce the power consumption of the coil L1 of the relay 10 while the relay 10 maintains a working state, and is beneficial to reducing the risk of overheating and burning of the relay 10.

[0055] Afterwards, when it is necessary to control the relay 10 to stop working, that is, at time T3, the control signal M1 is switched from high level to low level to control the first switch unit 311 to turn off. The coil L1 of the relay 10 loses power, and the contacts of the relay 10 return to the initial state, that is, the normally open contact is turned on, and the normally closed contact is turned off.

[0056] In some embodiments, Figure 6 As shown, the controlled module 30 includes a delay unit 33. Among them, Figure 6 Only illustrative examples are shown Figure 2 In the structure shown in the figure, a delay unit 33 is added as an example. It can be understood that in some other embodiments, Figure 3 and Figure 4 A delay unit 33 is added to the structure shown.

[0057] The first end of the delay unit 33 is electrically connected to the controller 20, and the second end of the delay unit 33 is electrically connected to the second switch unit 321. The delay unit 33 is configured to control the second switch unit 321 to turn off after the second switch unit 321 is turned on for a first time. By setting the delay unit 33, the following can be achieved: Figure 5 The control signal shown, wherein the control signal M1 is the signal output by the controller 20, and the control signal M1 is respectively input to the first switch unit 311 and the delay unit 33. On the one hand, the control signal of the first switch unit 311 is the control signal M1; on the other hand, the delay unit 33 can pull down the control signal M1 after delaying for a first time period. It can be seen that the signal output by the delay unit 33 is the control signal M2, wherein the first time period corresponds to the time period TS1.

[0058] Please refer to Figure 7 , Figure 7 Another implementation of the controlled module is shown as an example. In some embodiments, Figure 7 As shown, the controlled module 30 includes a third controlled module 34 .

[0059] The third controlled module 34 includes a third switch unit 341, a third voltage divider unit 342 and an energy storage unit 343. The third switch unit 341, the third voltage divider unit 342 and the coil L1 of the relay 10 are connected in series between the first power supply V1 and the ground GND. The third voltage divider unit 342 is connected in parallel with the energy storage unit 343, and the controller 20 is electrically connected to the third switch unit 341.

[0060] Specifically, when the driving relay 10 switches from non-operating to operating, the controller 20 controls the third switch unit 341 to be turned on. When the third switch unit 341 is just turned on, the energy storage unit 343 has not been charged, and the overall impedance of the controlled module 30 is small, which can be regarded as or close to 0, that is, the first impedance is 0.

[0061] Afterwards, the first power source V1 charges the energy storage unit 343 through the coil L1 of the relay 10. After the energy storage unit 343 is fully charged, the impedance of the third voltage dividing unit 342 is the second impedance. Obviously, the first impedance is smaller than the second impedance.

[0062] In summary, when driving the relay 10 to work, the voltage of the first power supply V1 acts on the coil L1 of the relay 10, and the voltage acting on the coil L1 of the relay 10 is relatively large, which can drive the relay 10 to work more reliably and stably; when the relay 10 maintains a working state, the difference between the voltage of the first power supply V1 and the voltage across the energy storage unit 343 acts on the coil L1 of the relay 10, and the voltage acting on the coil L1 of the relay 10 is relatively small, which can reduce the power consumption of the coil L1 of the relay 10 while the relay 10 maintains a working state, and is beneficial to reducing the risk of overheating and burning of the relay 10.

[0063] Understandably, Figure 7 Only one series connection mode of the third switch unit 341, the third voltage dividing unit 342 and the coil L1 of the relay 10 is exemplarily shown, that is, the coil L1 of the relay 10, the third voltage dividing unit 342 and the third switch unit 341 are sequentially connected in series between the first power supply V1 and the ground GND, and in other embodiments, the third switch unit 341, the third voltage dividing unit 342 and the coil L1 of the relay 10 may also be connected in other series modes, for example, Figure 8-Figure 12 The series connection method shown.

[0064] In some embodiments, Figure 8 As shown, the third voltage dividing unit 342 , the coil L1 of the relay 10 , and the third switch unit 341 are sequentially connected in series between the first power source V1 and the ground GND.

[0065] In some embodiments, Fig. 9As shown, the coil L1 of the relay 10 , the third switch unit 341 and the third voltage dividing unit 342 are sequentially connected in series between the first power source V1 and the ground GND.

[0066] In some embodiments, Fig.10 As shown, the third voltage dividing unit 342 , the third switch unit 341 and the coil L1 of the relay 10 are sequentially connected in series between the first power source V1 and the ground GND.

[0067] In some embodiments, Fig.11 As shown, the third switch unit 341, the coil L1 of the relay 10 and the third voltage dividing unit 342 are sequentially connected in series between the first power source V1 and the ground GND.

[0068] In some embodiments, Fig.12 As shown, the third switch unit 341, the third voltage dividing unit 342 and the coil L1 of the relay 10 are sequentially connected in series between the first power source V1 and the ground GND.

[0069] Understandably, Figure 8-Figure 12 The principle of the structure shown is similar to Figure 7 Similarly, it is within the scope that can be easily understood by those skilled in the art and will not be described in detail here.

[0070] In some embodiments, when any one of the first switch unit 311, the second switch unit 321 and the third switch unit 341 is directly connected to the ground GND, that is, Figure 2 , Figure 6-Figure 8 The structure shown in FIG. 1 , the circuit structure of any switch unit can be as follows Fig.13 shown.

[0071] like Fig.13 As shown, the switch unit 30_1 includes a first switch Q1 and a first resistor R1. The first end PA_1 of the switch unit 30_1 is the second end of the first switch Q1, the second end PA_2 of the switch unit 30_1 is the third end of the first switch Q1, and the third end PA_3 of the switch unit 30_1 is the first end of the first switch Q1. The first resistor R1 is disposed between the first end of the first switch Q1 and the third end of the first switch Q1.

[0072] When the switch unit 30_1 corresponds to Figure 2 or Figure 6In the case of the first switch unit 311 shown in FIG. 1 , the first end PA_1 of the switch unit 30_1 corresponds to the first end P11 of the first switch unit 311, the second end PA_2 of the switch unit 30_1 corresponds to the second end P12 of the first switch unit 311, and the third end PA_3 of the switch unit 30_1 corresponds to the third end P13 of the first switch unit 311. At this time, the first end of the first switch Q1 is electrically connected to the controller, the third end of the first switch Q1 is grounded GND, and the second end of the first switch Q1 is electrically connected to the corresponding voltage dividing unit (i.e., the first voltage dividing unit 312).

[0073] When the switch unit 30_1 corresponds to Figure 2 or Figure 6 When the second switch unit 321 is shown, the first end PA_1 of the switch unit 30_1 corresponds to the first end P21 of the second switch unit 321, the second end PA_2 of the switch unit 30_1 corresponds to the second end P22 of the second switch unit 321, and the third end PA_3 of the switch unit 30_1 corresponds to the third end P23 of the second switch unit 321. At this time, the first end of the first switch Q1 is electrically connected to the controller, the third end of the first switch Q1 is grounded GND, and the second end of the first switch Q1 is electrically connected to the corresponding voltage dividing unit (i.e., the second voltage dividing unit 322).

[0074] When the switch unit 30_1 corresponds to Figure 7 or Figure 8 When the third switch unit 341 is shown, the first end PA_1 of the switch unit 30_1 corresponds to the first end P31 of the third switch unit 341, the second end PA_2 of the switch unit 30_1 corresponds to the second end P32 of the third switch unit 341, and the third end PA_3 of the switch unit 30_1 corresponds to the third end P33 of the third switch unit 341. At this time, the first end of the first switch Q1 is electrically connected to the controller, the third end of the first switch Q1 is grounded GND, and the second end of the first switch Q1 is connected to the corresponding voltage divider unit (i.e. Figure 7 The third voltage dividing unit 342 shown) or the coil L1 of the relay 10 (ie Figure 8 The coil L1 of the relay 10 shown is electrically connected.

[0075] Specifically, when the controller 20 outputs a high level signal to the first end of the first switch Q1, the first switch Q1 is turned on, and the corresponding switch unit 30_1 is turned on. The first resistor R1 is used to generate a voltage drop, drive the first switch Q1 to turn on, and is used to discharge the discharge when the first switch Q1 is turned off, ensuring that the first switch Q1 is reliably turned off.

[0076] In this embodiment, the first switch Q1 is an N-type FET as an example, wherein the first end of the first switch Q1 is the gate of the N-type FET, the second end of the first switch Q1 is the drain of the N-type FET, and the third end of the first switch Q1 is the source of the N-type FET. In other embodiments, the first switch Q1 is an NPN-type transistor, then the first end of the first switch Q1 is the base of the NPN-type transistor, the second end of the first switch Q1 is the collector of the NPN-type transistor, and the third end of the first switch Q1 is the emitter of the NPN-type transistor. In addition, the first switch Q1 can be any controllable switch, such as a photocoupler, a relay, an insulated gate bipolar transistor (IGBT) device, etc.

[0077] In some embodiments, when the switch unit 30_1 corresponds to Figure 6 When the second switch unit 321 is shown, Fig.14 As shown, the delay unit 33 includes a first capacitor C1 . The first capacitor C1 is disposed between the controller 20 and the third terminal of the second switch unit 321 .

[0078] Specifically, when the driving relay 10 switches from non-operating to operating, the controller 20 outputs a high-level signal, the first switch unit 311 is turned on, and since the voltage across the first capacitor C1 does not change suddenly, the second switch unit 33 also receives a high-level signal, and the second switch unit 33 is turned on. The impedance of the first voltage divider unit 312 and the second voltage divider unit 322 connected in parallel is the first impedance.

[0079] Afterwards, the first capacitor C1 is charged, and the voltage of the first capacitor C1 gradually increases until the voltage at the connection point between the first capacitor C1 and the second switch unit 33 (i.e., the third terminal PA_3 of the switch unit 30_1) is less than the threshold voltage of the first switch Q1 of the second switch unit 321, and the second switch unit 321 is turned off. The relay maintains the working state, and the impedance of the first voltage divider unit 312 is the second impedance. It can be seen that the first impedance is less than the second impedance.

[0080] In summary, when driving the relay 10 to work, the voltage divided by the first power supply V1 on the coil L1 of the relay 10 is relatively large, and a relatively large voltage acts on the coil L1 of the relay 10, thereby driving the relay 10 to work more reliably and stably; when the relay 10 maintains a working state, the voltage divided by the first power supply V1 on the coil L1 of the relay 10 is relatively small, so that a relatively small voltage acts on the coil L1 of the relay 10, thereby reducing the power consumption of the coil L1 of the relay 10 while the relay 10 maintains a working state, which is beneficial to reducing the risk of overheating and burning of the relay 10.

[0081] In some embodiments, when the structure of the controlled module 30 is as follows Figure 2-Figure 4 , Figure 6-Figure 12 , Fig.18As shown, the circuit structure of any switch unit in the controlled module can be as follows Fig.15 The switch unit 30_3 shown. Specifically, the relay control circuit 100 includes a second power supply V2. The switch unit 30_3 includes a second switch Q2, a third switch Q3 and a fourth switch Q4. Among them, the first end PC_1 of the switch unit 30_3 is the second end of the fourth switch Q4, the second end PC_2 of the switch unit 30_3 is the third end of the fourth switch Q4, and the third end PC_3 of the switch unit 30_3 is the first end of the second switch Q2.

[0082] When the switch unit 30_3 corresponds to Figure 2-Figure 4 , Figure 6 In the case of the first switch unit 311 shown, the first terminal PC_1 of the switch unit 30_3 corresponds to the first terminal P11 of the first switch unit 311, the second terminal PC_2 of the switch unit 30_3 corresponds to the second terminal P12 of the first switch unit 311, and the third terminal PC_3 of the switch unit 30_3 corresponds to the third terminal P13 of the first switch unit 311. The second switch Q2 is electrically connected to the controller 20, the second switch Q2 and the third switch Q3 are connected in series between the second power source V2 and the ground GND, the second power source V2 is electrically connected to the fourth switch Q4 through the third switch Q3, and the fourth switch Q4 is connected in series with the corresponding voltage dividing unit (i.e., the first voltage dividing unit 312) and the coil L1 of the relay 10 between the first power source V1 and the ground GND.

[0083] When the switch unit 30_3 corresponds to Figure 2-Figure 4 , Figure 6 When the second switch unit 321 is shown, the first terminal PC_1 of the switch unit 30_3 corresponds to the first terminal P21 of the second switch unit 321, the second terminal PC_2 of the switch unit 30_3 corresponds to the second terminal P22 of the second switch unit 321, and the third terminal PC_3 of the switch unit 30_3 corresponds to the third terminal P23 of the second switch unit 321. The second switch Q2 is electrically connected to the controller 20, the second switch Q2 and the third switch Q3 are connected in series between the second power source V2 and the ground GND, the second power source V2 is electrically connected to the fourth switch Q4 through the third switch Q3, and the fourth switch Q4 is connected in series with the corresponding voltage dividing unit (i.e., the second voltage dividing unit 322) and the coil L1 of the relay 10 between the first power source V1 and the ground GND.

[0084] When the switch unit 30_3 corresponds to Figure 7-Figure 12 , Fig.18When the third switch unit 341 is shown, the first terminal PC_1 of the switch unit 30_3 corresponds to the first terminal P31 of the third switch unit 341, the second terminal PC_2 of the switch unit 30_3 corresponds to the second terminal P32 of the third switch unit 341, and the third terminal PC_3 of the switch unit 30_3 corresponds to the third terminal P33 of the third switch unit 341. The second switch Q2 is electrically connected to the controller 20, the second switch Q2 and the third switch Q3 are connected in series between the second power source V2 and the ground GND, the second power source V2 is electrically connected to the fourth switch Q4 through the third switch Q3, and the fourth switch Q4 is connected in series with the corresponding voltage dividing unit (i.e., the third voltage dividing unit 342) and the coil L1 of the relay 10 between the first power source V1 and the ground GND.

[0085] The second switch Q2, the third switch Q3 and the fourth switch Q4 are configured to perform the following operations: in response to the first control signal of the controller 20, the second switch Q2 is turned on; in response to the second switch Q2 being turned on, the third switch Q3 is turned on and the fourth switch Q4 is turned on. The fourth switch Q4 is turned on corresponding to the third switch unit 342 being turned on.

[0086] In this embodiment, taking the second switch Q2 as an NPN transistor, the third switch Q3 as a P-type FET, and the fourth switch Q4 as an N-type FET as an example, the first end of the second switch Q2 is the base of the NPN transistor, the second end of the second switch Q2 is the collector of the PNP transistor, and the third end of the second switch Q2 is the emitter of the NPN transistor; the first end of the third switch Q3 is the gate of the P-type FET, the second end of the third switch Q3 is the drain of the P-type FET, and the third end of the third switch Q3 is the source of the P-type FET; the first end of the fourth switch Q4 is the gate of the N-type FET, the second end of the fourth switch Q4 is the drain of the N-type FET, and the third end of the fourth switch Q4 is the source of the N-type FET. In other embodiments, the second switch Q2 is an N-type FET, the first end of the second switch Q2 is the gate of the N-type FET, the second end of the second switch Q2 is the drain of the N-type FET, and the third end of the second switch Q2 is the source of the N-type FET; the third switch Q3 is a PNP-type transistor, the first end of the third switch Q3 is the base of the PNP-type transistor, the second end of the third switch Q3 is the collector of the NPN-type transistor, and the third end of the third switch Q3 is the emitter of the NPN-type transistor; the fourth switch Q4 can also be an NPN-type transistor, the first end of the fourth switch Q4 is the base of the NPN-type transistor, the second end of the fourth switch Q4 is the collector of the NPN-type transistor, and the third end of the fourth switch Q4 is the emitter of the NPN-type transistor. In addition, the second switch Q2, the third switch Q3 and the fourth switch Q4 can be any controllable switches, such as a photocoupler, a relay, an insulated gate bipolar transistor (IGBT) device, etc.

[0087] In some embodiments, the third switch unit 341 further includes a second resistor R2 , a third resistor R3 , a fourth resistor R4 , and a fifth resistor R5 .

[0088] The second resistor R2 is arranged between the third end P33 of the third switch unit 341 and the first end of the second switch Q2, that is, the second resistor R2 is arranged between the controller 20 and the first end of the second switch Q2; the third resistor R3 is arranged between the first end of the second switch Q2 and the ground GND; the fourth resistor R4 is arranged between the second end of the second switch Q2 and the first end of the third switch Q3; the fifth resistor R5 is arranged between the first end of the third switch Q3 and the third end of the third switch Q3.

[0089] The second resistor R2 and the third resistor R3 divide the voltage of the first control signal output by the controller 20, and the second switch Q2 is driven to turn on by the voltage division of the first control signal on the third resistor R3. The third resistor R3 can also discharge the discharge amount when the second switch Q2 is turned off, ensuring that the second switch Q2 is reliably turned off. The fourth resistor R4 and the fifth resistor R5 divide the voltage of the second power supply V2 when the second switch Q2 is turned on, and the third switch Q3 is driven to turn on by the voltage division of the second power supply V2 on the fifth resistor R5. The fifth resistor R5 can also discharge the discharge amount when the third switch Q3 is turned off, ensuring that the third switch Q3 is reliably turned off.

[0090] In some embodiments, the third switch unit 341 further includes a third capacitor C3 and a voltage stabilizing diode D1. The third capacitor C3 is disposed between the second end of the third switch Q3 and the third end of the third switch Q3. The third capacitor C3 is used to absorb the peak voltage to reduce the risk of the third switch Q3 being damaged due to excessive voltage between the gate and the source, thereby protecting the third switch Q3. The voltage stabilizing diode D1 is used to clamp the voltage at the third end of the third switch Q3 when the voltage of the second power supply V2 is too large, thereby reducing the risk of the third switch Q3 being damaged due to excessive voltage, thereby protecting the third switch Q3.

[0091] In some embodiments, when the structure of the controlled module 30 is as follows Figure 3-Figure 4 , Figure 9-12 , Fig.18 As shown, the circuit structure of any switch unit can be as follows Fig.16 shown.

[0092] like Fig.16 As shown, the switch unit 30_2 includes a fifth switch Q5 and a sixth switch Q6, wherein the first terminal PB_1 of the switch unit 30_2 is the third terminal of the sixth switch Q6, the second terminal PB_2 of the switch unit 30_2 is the second terminal of the sixth switch Q6, and the third terminal PB_3 of the switch unit 30_2 is the first terminal of the fifth switch Q5.

[0093] When the switch unit 30_2 corresponds to Figure 3 and Figure 4 When the first switch unit 311 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P11 of the first switch unit 311, the second end PB_2 of the switch unit 30_2 corresponds to the second end P12 of the first switch unit 311, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P13 of the first switch unit 311. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is electrically connected to the coil L1 of the relay 10, and the third end of the sixth switch Q6 is electrically connected to the first power source V1 through the corresponding voltage dividing unit (i.e., the first voltage dividing unit 312).

[0094] When the switch unit 30_2 corresponds to Figure 3 and Figure 4 When the second switch unit 321 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P21 of the second switch unit 321, the second end PB_2 of the switch unit 30_2 corresponds to the second end P22 of the second switch unit 321, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P23 of the second switch unit 321. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is electrically connected to the coil L1 of the relay 10, and the third end of the sixth switch Q6 is electrically connected to the first power source V1 through the corresponding voltage dividing unit (i.e., the second voltage dividing unit 322).

[0095] When the switch unit 30_2 corresponds to Fig. 9 When the third switch unit 341 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P31 of the third switch unit 341, the second end PB_2 of the switch unit 30_2 corresponds to the second end P32 of the third switch unit 341, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P33 of the third switch unit 341. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is connected to the coil L1 of the relay 10, and the third end of the sixth switch Q6 is electrically connected to the first power source V1 through the coil L1 of the relay 10.

[0096] When the switch unit 30_2 corresponds to Fig.10When the third switch unit 341 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P31 of the third switch unit 341, the second end PB_2 of the switch unit 30_2 corresponds to the second end P32 of the third switch unit 341, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P33 of the third switch unit 341. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is connected to the coil L1 of the relay 10, and the third end of the sixth switch Q6 is electrically connected to the first power source V1 through the corresponding voltage dividing unit (i.e., the third voltage dividing unit 342).

[0097] When the switch unit 30_2 corresponds to Fig.11 When the third switch unit 341 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P31 of the third switch unit 341, the second end PB_2 of the switch unit 30_2 corresponds to the second end P32 of the third switch unit 341, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P33 of the third switch unit 341. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is connected to the coil L1 of the relay 10, and the third end of the sixth switch Q6 is electrically connected to the first power source V1.

[0098] When the switch unit 30_2 corresponds to Fig.12 and Fig.18 When the third switch unit 341 is shown, the first end PB_1 of the switch unit 30_2 corresponds to the first end P31 of the third switch unit 341, the second end PB_2 of the switch unit 30_2 corresponds to the second end P32 of the third switch unit 341, and the third end PB_3 of the switch unit 30_2 corresponds to the third end P33 of the third switch unit 341. At this time, the first end of the fifth switch Q5 is electrically connected to the controller 20, the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6, the third end of the fifth switch Q5 is grounded GND, the second end of the sixth switch Q6 is connected to the corresponding voltage dividing unit (i.e., the third voltage dividing unit 342), and the third end of the sixth switch Q6 is electrically connected to the first power supply V1.

[0099] Specifically, the fifth switch Q5 and the sixth switch Q6 are configured to perform the following operations: in response to the second control signal of the controller 20, the fifth switch Q5 is turned on; in response to the fifth switch Q5 being turned on, the sixth switch Q6 is turned on. The turning on of the sixth switch Q6 corresponds to the turning on of the third switch unit 341.

[0100] In this embodiment, taking the fifth switch Q5 as an N-type FET and the sixth switch Q6 as a P-type FET as an example, the first end of the fifth switch Q5 is the gate of the N-type FET, the second end of the fifth switch Q5 is the drain of the N-type FET, and the third end of the fifth switch Q5 is the source of the N-type FET; the first end of the sixth switch Q6 is the gate of the P-type FET, the second end of the sixth switch Q6 is the drain of the P-type FET, and the third end of the sixth switch Q6 is the source of the P-type FET. In other embodiments, the fifth switch Q5 is an NPN-type transistor, the first end of the fifth switch Q5 is the base of the PNP-type transistor, the second end of the fifth switch Q5 is the collector of the NPN-type transistor, and the third end of the fifth switch Q5 is the emitter of the NPN-type transistor; the sixth switch Q6 is a PNP-type transistor, the first end of the sixth switch Q6 is the base of the PNP-type transistor, the second end of the sixth switch Q6 is the collector of the PNP-type transistor, and the third end of the sixth switch Q6 is the emitter of the PNP-type transistor. In addition, the fifth switch Q5 and the sixth switch Q6 can be any controllable switches, such as a photocoupler, a relay, an insulated gate bipolar transistor (IGBT) device, etc.

[0101] In some embodiments, the switch unit 30_2 further includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9.

[0102] The sixth resistor R6 is disposed between the controller 20 and the first end of the fifth switch Q5, the seventh resistor R7 is disposed between the first end of the fifth switch Q5 and the ground GND, the eighth resistor R8 is disposed between the second end of the fifth switch Q5 and the first end of the sixth switch Q6, and the ninth resistor R9 is disposed between the first end of the sixth switch Q6 and the third end of the sixth switch Q6.

[0103] The sixth resistor R6 and the seventh resistor R7 divide the voltage of the second control signal output by the controller 20, and the fifth switch Q5 is driven to turn on by the voltage division of the second control signal on the seventh resistor R7. The seventh resistor R7 plays a role in discharging the discharge when the fifth switch Q5 is turned off, ensuring that the fifth switch Q5 is reliably turned off. When the fifth switch Q5 is turned on, the eighth resistor R8 and the ninth resistor R9 divide the voltage of the first terminal PB_1, and the voltage divided on the ninth resistor R9 drives the sixth switch Q6 to turn on. The ninth resistor R9 plays a role in discharging the discharge when the sixth switch Q6 is turned off, ensuring that the sixth switch Q6 is reliably turned off.

[0104] In some embodiments, the third switch unit 341 further includes a fourth capacitor C4 and a voltage stabilizing diode D2. The fourth capacitor C4 is disposed between the second end of the sixth switch Q6 and the third end of the sixth switch Q6. The fourth capacitor C4 is used to absorb the peak voltage to reduce the risk of the sixth switch Q6 being damaged due to excessive voltage between the gate and the source, thereby protecting the sixth switch Q6. The voltage stabilizing diode D2 is used to clamp the voltage at the third end of the sixth switch Q6 when the voltage at the first end PB_1 of the switch unit 30_2 is too large, thereby reducing the risk of the sixth switch Q6 being damaged due to excessive voltage, thereby protecting the sixth switch Q6.

[0105] Please refer to Fig.17 , Fig.17 Three circuit structure schematic diagrams of any voltage dividing unit (including the first voltage dividing unit 312, the second voltage dividing unit 322 and the third voltage dividing unit 342) are exemplarily shown. Fig.17 As shown in part (A1) of FIG. 1 , any voltage dividing unit includes at least one resistor (i.e., N resistors), the N resistors include resistor RA1, resistor RA2, ..., resistor RAN, N is an integer greater than or equal to 1, and the N resistors are connected in series. In other embodiments, the N resistors are connected in parallel or in mixed connection (including series and parallel connection). Fig.17 As shown in part (A2) of FIG. 1 , any voltage dividing unit includes at least one voltage zener diode (i.e., M voltage zener diodes), the M voltage zener diodes include voltage zener diodes DA1, voltage zener diodes DA2, ..., voltage zener diodes DAM, M is an integer greater than or equal to 1, and the M voltage zener diodes are connected in series. In other embodiments, the M voltage zener diodes are connected in parallel or in a mixed manner. Fig.17 As shown in part (A3) of the figure, any voltage dividing unit includes at least one resistor and at least one voltage zener diode, that is, N resistors and M voltage zener diodes, and N resistors and M voltage zener diodes are connected in series. In other embodiments, the N resistors and M voltage zener diodes are connected in parallel or in a mixed manner.

[0106] In some embodiments, the energy storage unit 343 includes a second capacitor C2. Fig.12 Taking the energy storage unit 343 as an example, Fig.18 As shown, the energy storage unit 343 includes a second capacitor C2, and the second capacitor C2 is connected in parallel with the third voltage dividing unit 342.

[0107] The embodiment of the present application further provides a battery management device, which includes the relay control circuit 100 in any embodiment of the present application.

[0108] In some embodiments, the battery management device includes a BMS (Battery Management System), which is used to monitor and manage the electronic system of the battery module, and the relay control circuit 100 is disposed on the BMS.

[0109] In some embodiments, the battery management device includes a BMS and a PCS (Power Conversion System, energy storage inverter), the PCS is used to achieve bidirectional conversion between direct current (DC) and alternating current (AC), and the above-mentioned relay control circuit 100 is arranged on the PCS.

[0110] The embodiment of the present application further provides a battery pack, which includes a battery module and a battery management device in any embodiment of the present application.

[0111] An embodiment of the present application further provides an electrical device, which includes the battery pack in any embodiment of the present application.

[0112] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A relay control circuit, comprising a relay, a controller and a first power supply, characterized in that: The relay control circuit also includes a controlled module; The controlled module and the coil of the relay are connected in series between the first power supply and the ground, and the controlled module is electrically connected to the controller; The controlled module is configured to: in response to the first power supply supplying power to the relay to drive the relay to work, the controlled module has a first impedance; in response to the relay maintaining a working state, the controlled module has a second impedance; Wherein, the first impedance is smaller than the second impedance.

2. The relay control circuit according to claim 1, characterized in that: The controlled module comprises a first controlled module and a second controlled module, wherein the first controlled module is connected in parallel with the second controlled module; The first controlled module comprises a first switch unit and a first voltage dividing unit, the first switch unit, the first voltage dividing unit and the coil of the relay are connected in series between the first power supply and the ground, and the controller is electrically connected to the first switch unit; The second controlled module includes a second switch unit and a second voltage divider unit. The second switch unit, the second voltage divider unit and the coil of the relay are connected in series between the first power supply and the ground. The controller is electrically connected to the second switch unit.

3. The relay control circuit according to claim 2, characterized in that: The controlled module includes a delay unit; The first end of the delay unit is electrically connected to the controller, and the second end of the delay unit is electrically connected to the second switch unit; The delay unit is configured to control the second switch unit to be turned off after the second switch unit is turned on for a first time period.

4. The relay control circuit according to claim 3, characterized in that: The delay unit includes a first capacitor.

5. The relay control circuit according to claim 1, characterized in that: The controlled module includes a third controlled module; The third controlled module comprises a third switch unit, a third voltage divider unit and an energy storage unit, wherein the third switch unit, the third voltage divider unit and the coil of the relay are connected in series between the first power supply and the ground; The third voltage dividing unit is connected in parallel with the energy storage unit, and the controller is electrically connected with the third switch unit.

6. The relay control circuit according to claim 5, characterized in that: The energy storage unit includes a second capacitor.

7. The relay control circuit according to any one of claims 2 to 6, characterized in that: Any switch unit in the controlled module includes a first switch and a first resistor; The first end of the first switch is electrically connected to the controller, the third end of the first switch is grounded, and the first resistor is arranged between the first end of the first switch and the third end of the first switch; The first switch satisfies one of the following conditions: i) the switch unit in the controlled module comprises a first switch unit and a second switch unit, and the second end of the first switch is electrically connected to the corresponding voltage dividing unit; ii) The switch unit in the controlled module includes a third switch unit, and the second end of the first switch is electrically connected to the corresponding voltage dividing unit or the coil of the relay.

8. The relay control circuit according to claim 7, characterized in that: The first switch includes an N-type FET or an NPN-type transistor; The first end of the first switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the first switch is the drain of the N-type FET or the collector of the NPN-type transistor, and the third end of the first switch is the source of the N-type FET or the emitter of the NPN-type transistor.

9. The relay control circuit according to any one of claims 2 to 6, characterized in that: The relay control circuit includes a second power supply; Any switch unit in the controlled module includes a second switch, a third switch and a fourth switch; The second switch is electrically connected to the controller, the second switch and the third switch are connected in series between the second power supply and the ground, the second power supply is electrically connected to the fourth switch through the third switch, and the fourth switch, the corresponding voltage dividing unit and the coil of the relay are connected in series between the first power supply and the ground; The second switch, the third switch, and the fourth switch are configured to perform the following operations: In response to a first control signal from the controller, the second switch is turned on; In response to the second switch being turned on, the third switch is turned on and the fourth switch is turned on.

10. The relay control circuit according to claim 9, characterized in that: The second switch is an N-type FET or an NPN-type transistor, the first end of the second switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the second switch is the drain of the N-type FET or the collector of the PNP-type transistor, and the third end of the second switch is the source of the N-type FET or the emitter of the NPN-type transistor; The third switch is a P-type FET or a PNP-type transistor, the first end of the third switch is the gate of the P-type FET or the base of the PNP-type transistor, the second end of the third switch is the drain of the P-type FET or the collector of the NPN-type transistor, and the third end of the third switch is the source of the P-type FET or the emitter of the NPN-type transistor; The fourth switch is an N-type FET or an NPN-type transistor, a first end of the fourth switch is a gate of the N-type FET or a base of the NPN-type transistor, a second end of the fourth switch is a drain of the N-type FET or a collector of the NPN-type transistor, and a third end of the fourth switch is a source of the N-type FET or an emitter of the NPN-type transistor; The third switch unit further includes a second resistor, a third resistor, a fourth resistor and a fifth resistor; The second resistor is arranged between the controller and the first end of the second switch, the third resistor is arranged between the first end of the second switch and the ground, the fourth resistor is arranged between the second end of the second switch and the first end of the third switch, and the fifth resistor is arranged between the first end of the third switch and the third end of the third switch.

11. The relay control circuit according to any one of claims 2 to 6, characterized in that: Any switch unit in the controlled module includes a fifth switch and a sixth switch; A first end of the fifth switch is electrically connected to the controller, a second end of the fifth switch is electrically connected to a first end of the sixth switch, and a third end of the fifth switch is grounded; The sixth switch satisfies one of the following conditions: i) the second end of the sixth switch is connected to the corresponding voltage dividing unit, and the third end of the sixth switch is electrically connected to the first power supply or is electrically connected to the first power supply through the coil of the relay; ii) the second end of the sixth switch is connected to the coil of the relay, and the third end of the sixth switch is electrically connected to the first power supply or is electrically connected to the first power supply through a corresponding voltage dividing unit; The fifth switch and the sixth switch are configured to perform the following operations: In response to a second control signal of the controller, the fifth switch is turned on; In response to the fifth switch being turned on, the sixth switch is turned on.

12. The relay control circuit according to claim 11, characterized in that: The fifth switch is an N-type FET or an NPN-type transistor, the first end of the fifth switch is the gate of the N-type FET or the base of the NPN-type transistor, the second end of the fifth switch is the drain of the N-type FET or the collector of the NPN-type transistor, and the third end of the fifth switch is the source of the N-type FET or the emitter of the NPN-type transistor; The sixth switch is a P-type FET or a PNP-type transistor, the first end of the sixth switch is the gate of the P-type FET or the base of the PNP-type transistor, the second end of the sixth switch is the drain of the P-type FET or the collector of the PNP-type transistor, and the third end of the sixth switch is the source of the P-type FET or the emitter of the PNP-type transistor; Any switch unit in the controlled module further includes a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; The sixth resistor is arranged between the controller and the first end of the fifth switch, the seventh resistor is arranged between the first end of the fifth switch and the ground, the eighth resistor is arranged between the second end of the fifth switch and the first end of the sixth switch, and the ninth resistor is arranged between the first end of the sixth switch and the third end of the sixth switch.

13. The relay control circuit according to any one of claims 2 to 12, characterized in that: Any voltage dividing unit in the controlled module includes at least one resistor and / or at least one voltage stabilizing diode.

14. A battery management device, characterized in that: Comprising the relay control circuit as described in any one of claims 1-13.

15. A battery pack, characterized in that: It comprises a battery module and the battery management device as claimed in claim 14.

16. An electrical device, characterized in that: The invention comprises a load and the battery pack as claimed in claim 15.

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