Magnetic latching relay control circuit and charging pile

Abstract

The invention provides a magnetic latching relay control circuit and a charging pile. The magnetic latching relay control circuit comprises a first driving module; the first driving module comprises a first pull-in unit, a first disconnection unit and a first enabling unit; the first enabling unit is connected with the first coil through the first pull-in unit, and the first enabling unit is connected with the second coil through the first disconnection unit; the input end of the first enabling unit is used for inputting a first enabling signal, the input end of the first pull-in unit is used for inputting a first pull-in signal, and the input end of the first disconnecting unit is used for inputting a first disconnecting signal; when the first enable signal and the first pull-in signal are high-level signals, the first enable unit, the first pull-in unit and the first coil are communicated, and the first relay is controlled to be closed; when the first enabling signal and the first disconnecting signal are high-level signals, the first enabling unit, the first disconnecting unit and the second coil are connected, and the first relay is controlled to be disconnected. According to the invention, misoperation of the relay can be reduced.

Description

Technical Field

[0001] The present application relates to the field of relay control technology, and in particular to a magnetic latching relay control circuit and a charging pile. Background Art

[0002] A relay is an electrical control device that controls the on and off of a circuit, and thus the operating state of a load. The drive of a relay is usually achieved through an enable signal, which is generally input into the drive circuit of the relay. The switch-on and switch-off of the relay are controlled by the change of the enable signal. However, when an electronic device in the circuit fails, such as a single point failure, causing the enable signal actually received by the relay to change, the relay will malfunction according to the changed enable signal, affecting the normal use of the load. Summary of the invention

[0003] The embodiments of the present application provide a magnetic latching relay control circuit and a charging pile to reduce the occurrence of relay malfunction.

[0004] In a first aspect, an embodiment of the present application provides a magnetic latching relay control circuit, the magnetic latching relay control circuit comprising a first driving module; the first driving module comprising a first pull-in unit, a first disconnection unit and a first enabling unit; the magnetic latching relay control circuit is used for a magnetic latching relay group, the magnetic latching relay group comprising a first relay provided with a first coil and a second coil; The first enabling unit is connected to the first coil via the first attracting unit, and the first enabling unit is connected to the second coil via the first disconnecting unit; The input end of the first enabling unit is used to input a first enabling signal, the input end of the first attracting unit is used to input a first attracting signal, and the input end of the first disconnecting unit is used to input a first disconnecting signal; When the first enabling signal and the first attracting signal are high level signals, the first enabling unit, the first attracting unit and the first coil are connected to control the first relay to be closed; When the first enabling signal and the first disconnecting signal are high-level signals, the first enabling unit, the first disconnecting unit, and the second coil are connected to control the first relay to be disconnected.

[0005] In a possible implementation, the relay group further includes a second relay provided with a third coil and a fourth coil; the first relay and the second relay are applied to a charging unit; the charging unit includes a first converter and a second converter; One of the first relay and the second relay is connected between the second output terminal of the first converter and the first output terminal of the second converter; the other of the first relay and the second relay is connected between the first output terminal of the first converter and the first output terminal of the second converter, or between the second output terminal of the first converter and the second output terminal of the second converter; The magnetic latching relay control circuit also includes a second driving module; the second driving module includes a second pickup unit, a second disconnection unit and a second enabling unit; The second enabling unit is connected to the third coil via the second attracting unit, and the second enabling unit is connected to the fourth coil via the second disconnecting unit; The input end of the second enabling unit is used to input a second enabling signal, the input end of the second attracting unit is used to input a second attracting signal, and the input end of the second disconnecting unit is used to input a second disconnecting signal; When the second enabling signal and the second attracting signal are high level signals, the second enabling unit, the second attracting unit and the third coil are connected to control the second relay to be closed; When the second enabling signal and the second disconnecting signal are high level signals, the second enabling unit, the second disconnecting unit and the fourth coil are connected to control the second relay to be disconnected; The first pull-in signal and the second pull-in signal are not high level signals at the same time.

[0006] In a possible implementation, the magnetic latching relay control circuit further includes a first logic module; the first logic module includes a first NOT gate, a first AND gate, a second NOT gate, and a second AND gate; The first input end of the first AND gate inputs the first driving signal through the first NOT gate; the second input end of the first AND gate is used to input the second driving signal; the output end of the first AND gate is connected to the input end of the first pull-in unit; the first AND gate generates the first pull-in signal and inputs it to the first pull-in unit; The first input end of the second AND gate inputs the second drive signal through the second NOT gate; the second input end of the second AND gate is used to input the first drive signal; the output end of the second AND gate is connected to the input end of the second attraction unit; the second AND gate generates the second attraction signal and inputs it to the second attraction unit.

[0007] In a possible implementation, the relay group further includes a third relay provided with a fifth coil and a sixth coil; The third relay is connected in parallel with the first relay; the first enabling unit is connected to the fifth coil via the first attracting unit, and the first enabling unit is connected to the sixth coil via the first disconnecting unit.

[0008] Alternatively, the third relay is connected in parallel with the second relay; the second enabling unit is connected to the fifth coil via the second attracting unit, and the second enabling unit is connected to the sixth coil via the second disconnecting unit.

[0009] In a possible implementation, the first pull-in unit includes a first transistor, the first disconnection unit includes a second transistor, and the first enabling unit includes a third transistor; The first end of the third triode is connected to the second end of the first triode and the second end of the second triode respectively; the second end of the third triode is used for grounding; the first end of the first triode is used for connecting the first coil, and the first end of the second triode is used for connecting the second coil; The third end of the first transistor is used to input the first pull-in signal, the third end of the second transistor is used to input the first disconnection signal, and the third end of the third transistor is used to input the first enable signal.

[0010] In a possible implementation, the second pull-in unit includes a fourth transistor, the second disconnection unit includes a fifth transistor, and the second enabling unit includes a sixth transistor; The first end of the sixth triode is connected to the second end of the fourth triode and the second end of the fifth triode respectively; the second end of the sixth triode is used for grounding; the first end of the fourth triode is used for connecting the first coil, and the first end of the fifth triode is used for connecting the second coil; The third end of the fourth transistor is used to input the second pull-in signal, the third end of the fifth transistor is used to input the second disconnection signal, and the third end of the sixth transistor is used to input the second enable signal.

[0011] In a second aspect, an embodiment of the present application provides a charging pile, comprising at least one charging unit; Each charging unit includes a first converter, a magnetic latching relay group, and a magnetic latching relay control circuit as described in the first aspect or any possible implementation of the first aspect.

[0012] In a possible implementation, the magnetic latching relay group includes a first relay; An output terminal of the first converter is connected to the first relay; and the magnetic latching relay control circuit is connected to the first relay.

[0013] In a possible implementation, each charging unit further includes a second converter; the magnetic latching relay group includes a first relay; The second output end of the first converter is connected to the first output end of the second converter through a first relay; and the magnetic latching relay control circuit is connected to the first relay.

[0014] In a possible implementation, each charging unit further includes a second converter; the magnetic latching relay group includes a second relay and a third relay; The first output end of the first converter is connected to the first output end of the second converter through the second relay, and the second output end of the first converter is connected to the second output end of the second converter through the third relay.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In the embodiment of the present application, the first relay includes a first coil and a second coil. The first enabling unit in the first driving module of the magnetic holding relay control circuit is connected to the first coil through the first attraction unit, and the first enabling unit is connected to the second coil through the first disconnection unit. When the first enabling signal input to the first enabling unit and the first attraction signal input to the first attraction unit are high-level signals, the first enabling unit, the first attraction unit and the first coil are connected, and the first relay can be controlled to be closed. When the first enabling signal and the first disconnection signal input to the first disconnection unit are high-level signals, the first enabling unit, the first disconnection unit and the second coil are connected, and the first relay can be controlled to be disconnected. When the first attraction signal or the first disconnection signal changes from a high level to a low level, the coil will not be connected, and the opposite current will not be input, which can avoid the state of the relay changing with an erroneous signal, reduce the occurrence of relay malfunction, and ensure the normal use of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is an application schematic diagram of a magnetic latching relay control circuit provided in an embodiment of the present application; Figure 2 It is a structural schematic diagram of a magnetic latching relay control circuit provided in an embodiment of the present application; Figure 3 is a circuit structure diagram of a first driving module provided in an embodiment of the present application; Figure 4 is another structural schematic diagram of a magnetic latching relay control circuit provided in an embodiment of the present application; Figure 5 is a circuit structure diagram of a second driving module provided in an embodiment of the present application; Figure 6 is a circuit structure diagram of a first logic module provided in an embodiment of the present application; Figure 7 is a circuit structure diagram of a second logic module provided in an embodiment of the present application; Figure 8 is a circuit structure diagram of a third logic module provided in an embodiment of the present application; Fig. 9 is a circuit structure diagram of a first enabling module provided in an embodiment of the present application; Fig.10 It is a structural schematic diagram of the first charging pile provided in the embodiment of the present application; Fig.11 It is a structural schematic diagram of a second charging pile provided in an embodiment of the present application; Fig.12 It is a structural schematic diagram of a third charging pile provided in an embodiment of the present application; Fig.13 It is a structural schematic diagram of the fourth charging pile provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0019] The inventors have found that in order to control the relay, an enable signal is usually input into the driving circuit of the relay, and the relay is controlled by the change of the enable signal. However, when the circuit of the enable signal fails, the enable signal will change from a high level to a low level, which will cause the relay to malfunction and affect the normal use of the load.

[0020] In addition, relays can also be used in charging piles. Since charging piles have different charging modes, multiple relays can be included in the charging pile to correspond to different charging modes. For example, a high-voltage relay can be set to control the charging pile in the first charging mode, and a low-voltage relay can be set to control the charging pile in the second charging mode. When the enable signal changes erroneously, the charging mode of the charging pile may change, or it may work in an abnormal mode, or even cause device damage.

[0021] Therefore, it is necessary to consider a control circuit of a relay.

[0022] In order to accurately control the relay and reduce the occurrence of relay malfunction, in the implementation manner of the present application, the relay is controlled by a first enabling unit, a first attraction unit and a first disconnection unit. The first relay is controlled to be closed by inputting a first enabling signal of the first enabling unit and a first attraction signal of the first attraction unit, and the first relay is controlled to be disconnected by the first enabling signal and a first disconnection signal of the first disconnection unit. The relay can be closed only when the first enabling signal and the first attraction signal are at a high level, and disconnected when the first enabling signal and the first disconnection signal are at a high level. The relay does not operate in other cases, thereby reducing the occurrence of relay malfunction.

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, the magnetic holding relay control circuit provided in the embodiment of the present application can be applied in a charging pile. The charging pile may include at least one charging unit. Each charging unit may include a magnetic holding relay control circuit 1, a magnetic holding relay group 2 and a first converter 3.

[0025] The magnetic latching relay control circuit 1 provided in the embodiment of the present application can be used to drive the relays in the magnetic latching relay group 2. Figure 2 A structural schematic diagram of a magnetic latching relay control circuit is shown, the magnetic latching relay group 2 includes a first relay RLY1 provided with a first coil 211 and a second coil 212, and the magnetic latching relay control circuit 1 includes a first drive module; the first drive module includes a first attraction unit 111, a first disconnection unit 112 and a first enabling unit 113.

[0026] The first enabling unit 113 is connected to the first coil 211 through the first attracting unit 111 , and the first enabling unit 113 is connected to the second coil 212 through the first disconnecting unit 112 .

[0027] The input end of the first enabling unit 113 is used to input the first enabling signal Relay1_EN, the input end of the first attracting unit 111 is used to input the first attracting signal Relay1_Closed, and the input end of the first disconnecting unit is used to input the first disconnecting signal Relay1_Open.

[0028] When the first enabling signal Relay1_EN and the first attracting signal Relay1_Closed are high level signals, ie, “1”, the first enabling unit 113 , the first attracting unit 111 and the first coil 211 are connected to control the first relay RLY1 to be closed.

[0029] When the first enabling signal Relay1_EN and the first disconnecting signal Relay1_Open are high level signals, ie, “1”, the first enabling unit 113 , the first disconnecting unit 112 and the second coil 212 are connected, and the first relay RLY1 is controlled to be disconnected.

[0030] Here, the connection point between the first coil 211 and the second coil 212 is also connected to a power source, specifically, the positive electrode of a DC power source. The first enabling unit 113 is also connected to a reference ground, which may be the negative electrode of the corresponding DC power source. Figure 2 In the diagram, 0V_DC is used to represent the reference ground, 0V represents the voltage of the circuit's reference ground, and DC represents direct current. For convenience, "grounding" is used below to represent the connection to the reference ground 0V_DC.

[0031] When the first relay RLY1 is closed, if the first pull-in signal Relay1_Closed changes from a high level "1" to a low level "0", at this time, the first enabling unit 113, the first pull-in unit 111 and the first coil 211 are not connected, and the first enabling unit 113, the first disconnecting unit 112 and the second coil 212 are not connected, then the first relay RLY1 does not input a current in the opposite direction to the closed state, and can still maintain a closed state, and the relay will not malfunction. If the first disconnecting signal Relay1_Open changes from a low level "0" to a high level "1", at this time, the first enabling unit 113, the first disconnecting unit 112 and the second coil 212 are connected, and the first enabling unit 113, the first pull-in unit 111 and the first coil 211 are connected, the magnetic fields generated by the two coils of the first relay RLY1 are opposite in direction and have the same strength, and the resultant force on the iron core of the first relay RLY1 is zero, and the current state can be maintained unchanged, that is, it remains closed.

[0032] When the first relay RLY1 is disconnected, if the first disconnection signal Relay1_Open changes from a high level "1" to a low level "0", at this time, the first enabling unit 113, the first disconnection unit 112 and the second coil 212 are not connected, and the first enabling unit 113, the first attraction unit 111 and the first coil 211 are not connected, then the first relay RLY1 does not input a current in the opposite direction to the disconnected state, and can still maintain the disconnected state, and the relay will not malfunction. If the first attraction signal Relay1_Closed changes from a low level "0" to a high level "1", at this time, the first enabling unit 113, the first attraction unit 111 and the first coil 211 are connected, and the first enabling unit 113, the first disconnection unit 112 and the second coil 212 are connected, the resultant force on the iron core of the first relay RLY1 is also zero, and the current state can still be maintained unchanged.

[0033] In addition, if the first enable signal Relay1_EN changes from a high level "1" to a low level "0", the first enable unit 113 will be disconnected. At this time, the first pull-in signal Relay1_Closed and the first disconnection signal Relay1_Open are not effective, the first coil 211 and the second coil 212 are not energized, and the first relay RLY1 can still maintain the current state. However, when the state of the first relay RLY1 needs to be changed, it is necessary to ensure that the first enable signal Relay1_EN is at a high level.

[0034] In the embodiment of the present application, the first relay includes a first coil and a second coil. The first enabling unit in the first driving module is connected to the first coil through the first attraction unit, and the first enabling unit is connected to the second coil through the first disconnection unit. When the first enabling signal input to the first enabling unit and the first attraction signal input to the first attraction unit are high-level signals, the first enabling unit, the first attraction unit and the first coil are connected, and the first relay can be controlled to close. When the first enabling signal and the first disconnection signal input to the first disconnection unit are high-level signals, the first enabling unit, the first disconnection unit and the second coil are connected, and the first relay can be controlled to open. When the first attraction signal or the first disconnection signal changes from a high level to a low level, the coil will not be connected, and the opposite current will not be input, which can avoid the state of the relay changing with an erroneous signal, reduce the occurrence of relay malfunction, and ensure the normal use of the load. Among them, the two coils of the first relay are respectively connected through the first attraction unit and the first disconnection unit, and the state of the first relay is controlled by the first attraction signal and the first disconnection signal, so that the control of closing and opening of the first relay can be separated. When only one signal changes, the state of the relay cannot be changed. Only through the cooperation of multiple signals can the state of the relay be changed, thereby reducing the occurrence of relay malfunction.

[0035] In some embodiments, see Figure 3 In the circuit structure diagram of the first driving module shown, the first pull-in unit 111 includes a first transistor Q1, the first disconnection unit 112 includes a second transistor Q2, and the first enabling unit 113 includes a third transistor Q3; The first end of the third transistor Q3 is connected to the second end of the first transistor Q1 and the second end of the second transistor Q2 respectively; the second end of the third transistor Q3 is used for grounding; the first end of the first transistor Q1 is used for connecting to the first coil 211, and the first end of the second transistor Q2 is used for connecting to the second coil 212; The third end of the first transistor Q1 is used to input the first closing signal Relay1_Closed, the third end of the second transistor Q2 is used to input the first disconnection signal Relay1_Open, and the third end of the third transistor Q3 is used to input the first enable signal Relay1_EN.

[0036] In this embodiment, the first pull-in signal Relay1_Closed is a high-level signal, i.e., "1", which is input to the base of the first transistor Q1, so that the first transistor Q1 can be turned on. The first enable signal Relay1_EN is a high-level signal, i.e., "1", which is input to the base of the third transistor Q3, so that the third transistor Q3 can be turned on. Accordingly, when the first transistor Q1 and the third transistor Q3 are turned on, the first coil 211 of the first relay RLY1 is energized, so that the first relay RLY1 can be closed.

[0037] The first disconnection signal Relay1_Open is a high level signal, i.e., "1", which is input to the base of the second transistor Q2, so that the second transistor Q2 can be turned on. The first enable signal Relay1_EN is a high level signal, i.e., "1", which is input to the base of the third transistor Q3, so that the third transistor Q3 can be turned on. Accordingly, when the second transistor Q2 and the third transistor Q3 are turned on, the second coil 212 of the first relay RLY1 is energized, so that the first relay RLY1 can be disconnected.

[0038] Here, when the first relay RLY1 needs to be controlled to be closed, the first pull-in signal Relay1_Closed is a high-level signal, i.e., "1", and the first disconnection signal Relay1_Open is a low-level signal, i.e., "0". When the first relay RLY1 needs to be controlled to be disconnected, the first disconnection signal Relay1_Open is a high-level signal, i.e., "1", and the first pull-in signal Relay1_Closed is a low-level signal, i.e., "0". That is, the first pull-in signal Relay1_Closed and the first disconnection signal Relay1_Open will not be high-level signals at the same time.

[0039] Optional, see Figure 3 As shown in the circuit structure diagram of the first driving module, the first pull-in unit 111 of this embodiment also includes a first pull-in resistor R11, a second pull-in resistor R12 and a first pull-in capacitor C11. The third end (i.e., the base) of the first transistor Q1 is respectively connected to the first end of the first pull-in resistor R11, the first end of the second pull-in resistor R12 and the first end of the first pull-in capacitor C11. The second end of the first pull-in resistor R11 is used to input the first pull-in signal Relay1_Closed. The second end of the second pull-in resistor R12 and the second end of the first pull-in capacitor C11 are connected and grounded.

[0040] The first disconnection unit 112 also includes a first resistor R21, a second resistor R22 and a first disconnection capacitor C21. The third end (i.e., the base) of the second transistor Q2 is respectively connected to the first end of the first resistor R21, the first end of the second resistor R22 and the first end of the first disconnection capacitor C21. The second end of the first resistor R21 is used to input the first disconnection signal Relay1_Open. The second end of the second resistor R22 and the second end of the first disconnection capacitor C21 are connected and then grounded.

[0041] The first enabling unit 113 also includes a first enabling resistor R31, a second enabling resistor R32 and a first enabling capacitor C31. The third end (i.e., the base) of the third transistor Q3 is respectively connected to the first end of the first enabling resistor R31, the first end of the second enabling resistor R32 and the first end of the first enabling capacitor C31. The second end of the first enabling resistor R31 is used to input the first enabling signal Relay1_EN. The second end of the second enabling resistor R32 and the second end of the first enabling capacitor C31 are connected and then grounded.

[0042] In addition, the first driving module further includes a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2. The first diode D1 is connected to both ends of the first coil 211, and the second diode D2 is connected to both ends of the second coil 212. The connection point between the first coil 211 and the second coil 212 is used to connect a power source (e.g. Figure 3 The connection point is also connected to the first end of the first capacitor C1 and the first end of the second capacitor C2, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are connected and grounded.

[0043] In actual use, the magnetic latching relay group 2 may include two or more relays, and the relays in the magnetic latching relay group are driven to close or open by the magnetic latching relay control circuit.

[0044] In some embodiments, see Figure 4Another structural schematic diagram of the magnetic latching relay control circuit shown in the figure, the magnetic latching relay group 2 also includes a second relay RLY2 provided with a third coil 221 and a fourth coil 222; the first relay RLY1 and the second relay RLY2 are applied to the charging unit; the charging unit may include a first converter and a second converter.

[0045] Optionally, the first relay RLY1 and the second relay RLY2 can control the first converter and the second converter respectively. For example, the first relay RLY1 can be connected in series with the first converter, and the first relay RLY1 can be used to control the output of the first converter; the second relay RLY2 can be connected in series with the second converter, and the second relay RLY2 can be used to control the output of the second converter.

[0046] In this embodiment, the first relay RLY1 and the second relay RLY2 can be connected in parallel, and the first relay RLY1 and the second relay RLY2 can be controlled simultaneously by the first driving module. A second driving module can also be additionally provided to control the second relay RLY2.

[0047] Optionally, the first relay RLY1 and the second relay RLY2 may also control the first converter and the second converter in different ways.

[0048] One of the first relay RLY1 and the second relay RLY2 is connected between the second output end of the first converter and the first output end of the second converter, so that the first converter and the second converter can be connected in series for high voltage output; the other of the first relay RLY1 and the second relay RLY2 is connected between the first output end of the first converter and the first output end of the second converter, or between the second output end of the first converter and the second output end of the second converter, so that only the output of the first converter or the second converter can be used for low voltage output.

[0049] Exemplarily, the first converter and the second converter are connected in series by the first relay RLY1 to perform high voltage output, that is, the second output end of the first converter is connected to the first output end of the second converter through the first relay RLY1. The first converter is connected by the second relay RLY2 to perform low voltage output, that is, the first output end of the first converter is connected to the first output end of the second converter through the second relay RLY2.

[0050] In this embodiment, the magnetic latching relay control circuit 1 may further include a second driving module; the second driving module includes a second attraction unit 121 , a second disconnection unit 122 , and a second enabling unit 123 .

[0051] The second enabling unit 123 is connected to the third coil 221 through the second attracting unit 121 , and the second enabling unit 123 is connected to the fourth coil 222 through the second disconnecting unit 122 .

[0052] The input end of the second enabling unit 123 is used to input the second enabling signal Relay2_EN, the input end of the second attracting unit 121 is used to input the second attracting signal Relay2_Closed, and the input end of the second disconnecting unit 122 is used to input the second disconnecting signal Relay2_Open; When the second enable signal Relay2_EN and the second pull-in signal Relay2_Closed are high level signals, i.e., "1", the second enable unit 123, the second pull-in unit 121 and the third coil 221 are connected, and the second relay RLY2 is controlled to be closed; When the second enabling signal Relay2_EN and the second disconnecting signal Relay2_Open are high level signals, ie, “1”, the second enabling unit 123 , the second disconnecting unit 122 and the fourth coil 222 are connected, and the second relay RLY2 is controlled to be disconnected.

[0053] Here, the connection point between the third coil 221 and the fourth coil 222 is also connected to a power source, specifically, the positive electrode of a DC power source. The second enabling unit 123 is also connected to a reference ground 0V_DC.

[0054] When the second relay RLY2 is closed, if the second pull-in signal Relay2_Closed changes from a high level "1" to a low level "0", at this time, the second enabling unit 123, the second pull-in unit 121 and the third coil 221 are not connected, and the second enabling unit 123, the second disconnecting unit 122 and the fourth coil 222 are not connected, then the second relay RLY2 does not input a current in the opposite direction to the closed state, and can still maintain a closed state, and the relay will not malfunction. If the second disconnecting signal Relay2_Open changes from a low level "0" to a high level "1", at this time, the third coil 221 and the fourth coil 222 are energized, and the magnetic fields generated by the two coils of the second relay RLY2 are opposite in direction and have the same strength, and the resultant force on the iron core of the second relay RLY2 is zero, and the current state can be maintained unchanged, that is, it remains closed.

[0055] In the case of the second relay RLY2, if the second disconnection signal Relay2_Open changes from a high level "1" to a low level "0", at this time, the second enabling unit 123, the second disconnection unit 122 and the fourth coil 222, and the second enabling unit 123, the second attraction unit 121 and the third coil 221 are not connected, then the second relay RLY2 does not input a current in the opposite direction to the disconnected state, and can still maintain the disconnected state, and the relay will not malfunction. If the second attraction signal Relay2_Closed changes from a low level "0" to a high level "1", at this time, the third coil 221 and the fourth coil 222 are energized, and the resultant force on the iron core of the second relay RLY2 is also zero, and the current state can still be maintained unchanged, that is, the disconnected state.

[0056] In addition, the effect of the second enable signal Relay2_EN on the second relay RLY2 is the same as the effect of the first enable signal Relay1_EN on the first relay RLY1 , ​​and reference may be made to the above description of the first enable signal Relay1_EN.

[0057] It should be noted that since the first relay RLY1 and the second relay RLY2 correspond to high voltage output and low voltage output respectively, the two relays cannot be closed at the same time. Accordingly, when the first enable signal Relay1_EN and the second enable signal Relay2_EN are both high levels, the first pull-in signal Relay1_Closed and the second pull-in signal Relay2_Closed are not high level signals at the same time.

[0058] In some embodiments, see Figure 5 As shown in the circuit structure diagram of the second driving module, the second attracting unit 121 includes a fourth transistor Q4, the second disconnecting unit 122 includes a fifth transistor Q5, and the second enabling unit 123 includes a sixth transistor Q6.

[0059] The first end of the sixth transistor Q6 is respectively connected to the second end of the fourth transistor Q4 and the second end of the fifth transistor Q5; the second end of the sixth transistor Q6 is used for grounding; the first end of the fourth transistor Q4 is used for connecting to the third coil 221, and the first end of the fifth transistor Q5 is used for connecting to the fourth coil 222.

[0060] The third end of the fourth transistor Q4 is used to input the second closing signal Relay2_Closed, the third end of the fifth transistor Q5 is used to input the second disconnection signal Relay2_Open, and the third end of the sixth transistor Q6 is used to input the second enable signal Relay2_EN.

[0061] Here, for the control of the second pull-in signal Relay2_Closed, the second disconnection signal Relay2_Open and the second enable signal Relay2_EN, reference may be made to the description of the first pull-in signal Relay1_Closed, the first disconnection signal Relay1_Open and the first enable signal Relay1_EN in the above embodiment, which will not be repeated here.

[0062] Optional, see Figure 5 As shown in the circuit structure diagram of the second driving module, the second pull-in unit 121 of this embodiment further includes a third pull-in resistor R13, a fourth pull-in resistor R14 and a second pull-in capacitor C12.

[0063] The third end (i.e., base) of the fourth transistor Q4 is respectively connected to the first end of the third pull-in resistor R13, the first end of the fourth pull-in resistor R14, and the first end of the second pull-in capacitor C12. The second end of the third pull-in resistor R13 is used to input the second pull-in signal Relay2_Closed. The second end of the fourth pull-in resistor R14 is connected to the second end of the second pull-in capacitor C12 and then grounded.

[0064] The second disconnecting unit 122 further includes a third resistor R23, a fourth resistor R24 ​​and a second disconnecting capacitor C22.

[0065] The third end (i.e., base) of the fifth transistor Q5 is respectively connected to the first end of the third resistor R23, the first end of the fourth resistor R24, and the first end of the second disconnect capacitor C22. The second end of the third resistor R23 is used to input the second disconnect signal Relay2_Open. The second end of the fourth resistor R24 ​​is connected to the second end of the second disconnect capacitor C22 and then grounded.

[0066] The second enabling unit 123 further includes a third enabling resistor R33 , a fourth enabling resistor R34 , and a second enabling capacitor C32 .

[0067] The third end (i.e., base) of the sixth transistor Q6 is respectively connected to the first end of the third enabling resistor R33, the first end of the fourth enabling resistor R34, and the first end of the second enabling capacitor C32. The second end of the third enabling resistor R33 is used to input the second enabling signal Relay2_EN. The second end of the fourth enabling resistor R34 is connected to the second end of the second enabling capacitor C32 and then grounded.

[0068] In addition, the second driving module further includes a third diode D3, a fourth diode D4, a third capacitor C3 and a fourth capacitor C4. The third diode D3 is connected to both ends of the third coil 221, and the fourth diode D4 is connected to both ends of the fourth coil 222. The connection point between the third coil 221 and the fourth coil 222 is used to connect a power source (e.g. Figure 5The connection point is also connected to the first end of the third capacitor C3 and the first end of the fourth capacitor C4, and the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are connected and grounded.

[0069] The first relay RLY1 and the second relay RLY2 can correspond to different working states of the load, and the first relay RLY1 and the second relay RLY2 can be controlled simultaneously to achieve switching of the working states.

[0070] In some embodiments, the magnetic latching relay control circuit 1 further includes a first logic module. Figure 6 The circuit structure diagram of the first logic module shown in the figure shows that the first logic module includes a first NOT gate NOT1, a first AND gate AND1, a second NOT gate NOT2 and a second AND gate AND2.

[0071] The first input end of the first AND gate AND1 inputs the first driving signal Relay_A through the first NOT gate NOT1; the second input end of the first AND gate AND1 is used to input the second driving signal Relay_B; the output end of the first AND gate AND1 is connected to the input end of the first attraction unit 111; the first AND gate AND1 generates a first attraction signal Relay1_Closed and inputs it to the first attraction unit 111.

[0072] Here, the first driving signal Relay_A passes through the first NOT gate NOT1, and changes from a high level "1" to a low level "0", or from a low level "0" to a high level "1", and then is input to the first AND gate AND1. The second driving signal Relay_B is also input to the first AND gate, and the first AND gate outputs a signal to the first pull-in unit 111 according to the two input signals, that is, the first AND gate generates a first pull-in signal Relay1_Closed to control the first relay RLY1.

[0073] The first driving signal Relay_A indicates whether to control the second relay RLY2 to be closed. When the first driving signal Relay_A is at a high level, it indicates that the second relay RLY2 is controlled to be closed. When the first driving signal Relay_A is at a low level, it indicates that the second relay RLY2 is not controlled to be closed.

[0074] The second driving signal Relay_B indicates whether to control the first relay RLY1 to be closed. When the second driving signal Relay_B is at a high level, it indicates that the first relay RLY1 is controlled to be closed. When the second driving signal Relay_B is at a low level, it indicates that the first relay RLY1 is not controlled to be closed.

[0075] Exemplarily, in the charging pile, the first relay RLY1 and the second relay RLY2 correspond to different charging modes. For example, the first relay RLY1 corresponds to the high voltage gear, and the second relay RLY2 corresponds to the low voltage gear. The first relay RLY1 and the second relay RLY2 are usually not closed at the same time. Therefore, the first drive signal Relay_A and the second drive signal Relay_B are not both high-level signals in the normal state.

[0076] The first input end of the second AND gate AND2 inputs the second drive signal Relay_B through the second NOT gate NOT2; the second input end of the second AND gate AND2 is used to input the first drive signal Relay_A; the output end of the second AND gate AND2 is connected to the input end of the second attraction unit 121; the second AND gate AND2 generates a second attraction signal Relay2_Closed and inputs it to the second attraction unit 121.

[0077] Here, the second driving signal Relay_B passes through the second NOT gate NOT2, and changes from a high level "1" to a low level "0", or from a low level "0" to a high level "1", and then is input to the second AND gate AND2. The first driving signal Relay_A is also input to the second AND gate AND2, and the second AND gate AND2 outputs a signal to the second pull-in unit 121 according to the two input signals, that is, the second AND gate AND2 generates a second pull-in signal Relay2_Closed to control the second relay RLY2.

[0078] Based on this, when controlling the first relay RLY1 to close or controlling the second relay RLY2 to close, the levels of the first drive signal Relay_A and the second drive signal Relay_B are different. That is, when the first relay RLY1 needs to be controlled to close, the first drive signal Relay_A is a low level "0" and the second drive signal Relay_B is a high level "1"; when the second relay RLY2 needs to be controlled to close, the first drive signal Relay_A is a high level "1" and the second drive signal Relay_B is a low level "0".

[0079] Optionally, the first logic module may also include a first closed resistor R131, a second closed resistor R132, a third closed resistor R133, a fourth closed resistor R134, a fifth closed resistor R135, a sixth closed resistor R136, a seventh closed resistor R137, an eighth closed resistor R138, a first closed diode D131, a second closed diode D132, a third closed diode D133, a fourth closed diode D134, a fifth closed diode D135, a sixth closed diode D136, a seventh closed diode D137, an eighth closed diode D138, a first closed capacitor C131 and a second closed capacitor C132.

[0080] The input end of the first NOT gate NOT1 is connected to the second input end of the second AND gate AND2, and the connection points are respectively connected to the first end of the first closed resistor R131, the first end of the second closed resistor R132, the anode of the first closed diode D131, the cathode of the second closed diode D132 and the first end of the first closed capacitor C131; the second end of the first closed resistor R131 is used to input the first drive signal Relay_A; the cathode of the first closed diode D131 is connected to the power supply (for example Figure 6 +3.3V auxiliary power supply +3.3V_AS); a second end of the second closed resistor R132, an anode of the second closed diode D132 and a second end of the first closed capacitor C131 are used for grounding.

[0081] The input end of the second NOT gate NOT2 is connected to the second input end of the first AND gate AND1, and the connection points are respectively connected to the first end of the third closed resistor R133, the first end of the fourth closed resistor R134, the anode of the third closed diode D133, the cathode of the fourth closed diode D134 and the first end of the second closed capacitor C132; the second end of the third closed resistor R133 is used to input the second drive signal Relay_B; the cathode of the third closed diode D133 is connected to the power supply (for example Figure 6 +3.3V auxiliary power supply +3.3V_AS); a second end of the fourth closed resistor R134, an anode of the fourth closed diode D134 and a second end of the second closed capacitor C132 are used for grounding.

[0082] The output end of the first NOT gate NOT1 is connected to the first input end of the first AND gate AND1 through the fifth closed resistor R135; the output end of the second NOT gate NOT2 is connected to the first input end of the second AND gate AND2 through the sixth closed resistor R136.

[0083] The output end of the first AND gate AND1 is connected to the first end of the seventh closed resistor R137, the second end of the seventh closed resistor R137 is connected to the anode of the fifth closed diode D135 and the cathode of the sixth closed diode D136, and the first AND gate AND1 outputs the first pull-in signal Relay1_Closed through the seventh closed resistor R137. In addition, the cathode of the fifth closed diode D135 is connected to the power supply (for example Figure 6 +5V auxiliary power supply +5V_AS); the anode of the sixth closed diode D136 is used for grounding.

[0084] The output end of the second AND gate AND2 is connected to the first end of the eighth closed resistor R138, the second end of the eighth closed resistor R138 is connected to the anode of the seventh closed diode D137 and the cathode of the eighth closed diode D138, and the second AND gate AND2 outputs the second pull-in signal Relay2_Closed through the eighth closed resistor R138. In addition, the cathode of the seventh closed diode D137 is connected to the power supply (for example Figure 6 The anode of the eighth closed diode D138 is used for grounding.

[0085] In some embodiments, the magnetic latching relay control circuit 1 may further include a second logic module and a third logic module.

[0086] like Figure 7 As shown, the second logic module includes a third AND gate AND3; the first input end of the third AND gate AND3 is used to input a reference voltage, the second input end of the third AND gate AND3 is used to input a third drive signal Relay_C, and the output end of the third AND gate AND3 is connected to the first disconnection unit 112; the third AND gate AND3 generates a first disconnection signal Relay1_Open according to the reference voltage and the third drive signal Relay_C, and inputs it to the first disconnection unit 112.

[0087] Here, the third driving signal Relay_C indicates whether to control the first relay RLY1 to be disconnected. When the third driving signal Relay_C is at a high level, it indicates that the first relay RLY1 is controlled to be disconnected. When the third driving signal Relay_C is at a low level, it indicates that the first relay RLY1 is not controlled to be disconnected.

[0088] like Figure 8 As shown, the third logic module includes a fourth AND gate AND4; the first input end of the fourth AND gate AND4 is used to input a reference voltage, the second input end of the fourth AND gate AND4 is used to input a fourth drive signal Relay_D, and the output end of the fourth AND gate AND4 is connected to the second disconnection unit 122; the fourth AND gate AND4 generates a second disconnection signal Relay2_Open according to the reference voltage and the fourth drive signal Relay_D, and inputs it to the second disconnection unit 122.

[0089] Here, the fourth driving signal Relay_D indicates whether to control the second relay RLY2 to be disconnected. When the fourth driving signal Relay_D is at a high level, it indicates that the second relay RLY2 is controlled to be disconnected. When the fourth driving signal Relay_D is at a low level, it indicates that the second relay RLY2 is not controlled to be disconnected.

[0090] Optionally, the second logic module also includes a first disconnect resistor R141, a second disconnect resistor R142, a third disconnect resistor R143, a fourth disconnect resistor R144, a first disconnect diode D141, a second disconnect diode D142, a third disconnect diode D143, a fourth disconnect diode D144 and a third disconnect capacitor C141.

[0091] The second input end of the third AND gate AND3 is respectively connected to the first end of the first disconnect resistor R141, the first end of the second disconnect resistor R142, the anode of the first disconnect diode D141, the second disconnect diode D142 and the first end of the third disconnect capacitor C141; the second end of the first disconnect resistor R141 is used to input the third drive signal Relay_C; the cathode of the first disconnect diode D141 is connected to the power supply (for example Figure 7 +3.3V auxiliary power supply +3.3V_AS); a second end of the second disconnect resistor R142, an anode of the second disconnect diode D142 and a second end of the third disconnect capacitor C141 are used for grounding.

[0092] The first input terminal of the third AND gate AND3 inputs the reference voltage through the third disconnect resistor R143.

[0093] The output end of the third AND gate AND3 is connected to the first end of the fourth disconnect resistor R144, the second end of the fourth disconnect resistor R144 is connected to the anode of the third disconnect diode D143 and the cathode of the fourth disconnect diode D144, and the third AND gate AND3 outputs the first disconnect signal Relay1_Open through the fourth disconnect resistor R144. In addition, the cathode of the third disconnect diode D143 is connected to the power supply (for example Figure 7 The anode of the fourth disconnect diode D144 is used for grounding.

[0094] The third logic module also includes a fifth disconnect resistor R151, a sixth disconnect resistor R152, a seventh disconnect resistor R153, an eighth disconnect resistor R154, a fifth disconnect diode D151, a sixth disconnect diode D152, a seventh disconnect diode D153, an eighth disconnect diode D154 and a fourth disconnect capacitor C151.

[0095] The second input end of the fourth AND gate AND4 is respectively connected to the first end of the fifth disconnect resistor R151, the first end of the sixth disconnect resistor R152, the anode of the fifth disconnect diode D151, the sixth disconnect diode D152 and the first end of the fourth disconnect capacitor C151; the second end of the fifth disconnect resistor R151 is used to input the fourth drive signal Relay_D; the cathode of the fifth disconnect diode D151 is connected to the power supply (for example Figure 8+3.3V auxiliary power supply +3.3V_AS); a second end of the sixth disconnection resistor R152, an anode of the sixth disconnection diode D152 and a second end of the fourth disconnection capacitor C151 are used for grounding.

[0096] A first input terminal of the fourth AND gate AND4 inputs the reference voltage through the seventh disconnect resistor R153.

[0097] The output end of the fourth AND gate AND4 is connected to the first end of the eighth disconnect resistor R154, the second end of the eighth disconnect resistor R154 is connected to the anode of the seventh disconnect diode D153 and the cathode of the eighth disconnect diode D154, and the fourth AND gate AND4 outputs the second disconnect signal Relay2_Open through the eighth disconnect resistor R154. In addition, the cathode of the seventh disconnect diode D153 is connected to the power supply (for example Figure 7 +5V auxiliary power supply +5V_AS); the anode of the eighth disconnect diode D154 is used for grounding.

[0098] In some embodiments, Figure 5 As shown, the magnetic latching relay group 2 may further include a third relay RLY3 provided with a fifth coil 231 and a sixth coil 232 .

[0099] The third relay RLY3 is connected in parallel with the first relay RLY1 ; the first enabling unit 113 is connected to the fifth coil 231 via the first attracting unit 111 , and the first enabling unit 113 is connected to the sixth coil 232 via the first disconnecting unit 112 .

[0100] Alternatively, the third relay RLY3 is connected to the second relay RLY2 in parallel; the second enabling unit 123 is connected to the fifth coil 231 via the second attracting unit 121 , and the second enabling unit 123 is connected to the sixth coil 232 via the second disconnecting unit 122 .

[0101] In this embodiment, two relays can be connected in parallel, and the first drive module or the second drive module can be used to drive the two relays simultaneously. Figure 5 Schematic diagram showing a case where the third relay RLY3 is connected in parallel with the second relay RLY2.

[0102] In other embodiments, the magnetic latching relay control circuit 1 may further include a first enabling module and a second enabling module. The input end of the first enabling module is used to input the first enabling drive signal Relay_1, and the first enabling module generates a first enabling signal Relay1_EN according to the input first enabling drive signal Relay_1, and inputs it to the first enabling unit 113. The input end of the second enabling module is used to input the second enabling drive signal Relay_2, and the second enabling module generates a second enabling signal Relay2_EN according to the input second enabling drive signal Relay_2, and inputs it to the second enabling unit 123.

[0103] The specific structures of the two enabling modules are the same, and the first enabling module is used for illustration. Fig. 9 As shown, the first enabling module includes a fifth enabling resistor R161, a sixth enabling resistor R162, a seventh enabling resistor R163, a first enabling diode D161, a second enabling diode D162, a third enabling capacitor C161 and a first enabling transistor Q161.

[0104] A first end of the fifth enabling resistor R161, an anode of the first enabling diode D161, and a cathode of the second enabling diode D162 are connected, and a connection point thereof serves as an input end of the first enabling module.

[0105] The second end of the fifth enabling resistor R161 is respectively connected to the first end of the third enabling capacitor C161 , the first end of the sixth enabling resistor R162 , and the third end of the first enabling transistor Q161 .

[0106] The cathode of the first enabling diode D161 is connected to a power source (eg Fig. 9 An anode of the second enabling diode D162, a second end of the third enabling capacitor C161, and a second end of the sixth enabling resistor R162 are all grounded.

[0107] The first end of the first enabling transistor Q161 is connected to a power source (eg Fig. 9 The +5V auxiliary power supply +5V_AS is used as the output end of the first enabling module.

[0108] The following is an embodiment of the charging pile device of the present application. For details not described in detail, please refer to the above-mentioned corresponding embodiment of the magnetic latching relay control circuit.

[0109] Figure 1 The structure of the charging pile provided in the embodiment of the present application is shown. For the convenience of explanation, only the part related to the embodiment of the present application is shown, which is described in detail as follows: like Figure 1As shown, the charging pile includes at least one charging unit. Each charging unit includes a first converter 3, a magnetic latching relay group 2, and a magnetic latching relay control circuit 1 as in the above embodiments.

[0110] In this embodiment, the magnetic latching relay control circuit 1 can drive the relays in the magnetic latching relay group 2 to control the relays to close or open, thereby starting or stopping the charging pile.

[0111] In some embodiments, Fig.10 As shown, the magnetic latching relay group 2 includes a first relay RLY1; an output end of the first converter 3 is connected to the first relay RLY1; and the magnetic latching relay control circuit 1 is connected to the first relay RLY1.

[0112] In this embodiment, the magnetic latching relay group 2 may include a relay, namely, a first relay RLY1. The first relay RLY1 may be controlled by the magnetic latching relay control circuit 1, so that the first converter 3 starts to output voltage or stops outputting voltage ( Fig.10 In the figure, V1 represents a first voltage at a first output terminal of the first converter, and V2 represents a second voltage at a second output terminal of the first converter).

[0113] In some embodiments, Fig.11 As shown, each charging unit also includes a second converter 4; the magnetic latching relay group 2 includes a first relay RLY1; the second output end of the first converter 3 is connected to the first output end of the second converter 4 through the first relay RLY1; and the magnetic latching relay control circuit 1 is connected to the first relay RLY1.

[0114] In this embodiment, the first converter 3 and the second converter 4 can be connected in series through the first relay RLY1, and the first relay RLY1 can be controlled by the magnetic latching relay control circuit 1 to realize the control of the high voltage gear of the charging pile. The first output end of the first converter corresponds to the first voltage V1, and the second output end of the first converter corresponds to the second voltage ( Fig.11 Not involved in the process), the first output terminal of the second converter corresponds to the third voltage ( Fig.11 Not involved in the description), the second output terminal of the second converter corresponds to the fourth voltage V4.

[0115] In other embodiments, Fig.12 As shown, each charging unit also includes a second converter 4; the magnetic holding relay group 2 includes a second relay RLY2 and a third relay RLY3; the first output end of the first converter 3 is connected to the first output end of the second converter 4 through the second relay RLY2, and the second output end of the first converter 3 is connected to the second output end of the second converter 4 through the third relay RLY3.

[0116] In this embodiment, a second converter 4 can also be provided in the charging unit. The first converter 3 and the second converter 4 can be connected in parallel through the second relay RLY2 and the third relay RLY3. The second relay RLY2 and the third relay RLY3 can be controlled by the magnetic holding relay control circuit 1 to realize the control of the low voltage gear of the charging pile.

[0117] Optional, such as Fig.13 As shown, the high voltage gear and the low voltage gear can be set simultaneously in the charging unit of the charging pile.

[0118] The second output end of the first converter 3 is connected to the first output end of the second converter 4 through the first relay RLY1. The first output end of the first converter 3 is connected to the first output end of the second converter 4 through the second relay RLY2, and the second output end of the first converter 3 is connected to the second output end of the second converter 4 through the third relay RLY3. The magnetic latching relay control circuit 1 connects the first relay RLY1, the second relay RLY2 and the third relay RLY3.

[0119] The first output end of the first converter corresponds to the first voltage V1, the second output end of the first converter corresponds to the second voltage V2, the first output end of the second converter corresponds to the third voltage V3, and the second output end of the second converter corresponds to the fourth voltage V4.

[0120] by Fig.13 Taking the charging pile shown in the figure as an example, when the first enable signal Relay1_EN is high, the second enable signal Relay2_EN is high, the first drive signal Relay_A is high, the second drive signal Relay_B is low, the third drive signal Relay_C is high, and the fourth drive signal Relay_D is low: For the first relay RLY1, the first enable signal Relay1_EN is at a high level, and the first enable unit 113 is turned on. The first logic module outputs a low-level first pull-in signal Relay1_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the first pull-in unit 111 is not turned on. The second logic module outputs a high-level first disconnection signal Relay1_Open according to the third drive signal Relay_C, and the first disconnection unit 112 is turned on. That is, the first enable unit 113 and the first disconnection unit 112 are turned on, and the first relay RLY1 is turned off.

[0121] For the second relay RLY2 and the third relay RLY3, the second enable signal Relay2_EN is at a high level, and the second enable unit 123 is turned on. The first logic module outputs a high-level second pull-in signal Relay2_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the second pull-in unit 121 is turned on. The third logic module outputs a low-level second disconnection signal Relay2_Open according to the fourth drive signal Relay_D, and the second disconnection unit 122 is not turned on. That is, the second enable unit 123 and the second pull-in unit 121 are turned on, and the second relay RLY2 and the third relay RLY3 are closed.

[0122] Based on this, the charging pile operates at low voltage.

[0123] In the above case, if the first drive signal Relay_A changes from a high level to a low level, the first logic module outputs a low-level first attraction signal Relay1_Closed and a low-level second attraction signal Relay2_Closed, and the first attraction unit 111 and the second attraction unit 121 are not conductive. At this time, the second disconnection unit 122 is also not conductive, the second relay RLY2 and the third relay RLY3 remain in a closed state, and the first relay RLY1 remains in a disconnected state, and the relay will not malfunction due to erroneous changes in the signal.

[0124] If the second driving signal Relay_B changes from a low level to a high level, the first logic module outputs a low-level first closure signal Relay1_Closed and a low-level second closure signal Relay2_Closed. As can be seen from the above, the first relay RLY1, the second relay RLY2 and the third relay RLY3 remain in their original states, and the relays will not malfunction due to erroneous changes in the signal.

[0125] If the third driving signal Relay_C changes from high level to low level, the second logic module outputs the low level first disconnection signal Relay1_Open, the first disconnection unit 112 is not conducting, and the first pull-in unit 111 is also not conducting, the first relay RLY1 remains in the disconnected state, and the relay does not malfunction due to the erroneous change of the signal. The charging pile can still work normally.

[0126] If the fourth driving signal Relay_D changes from a low level to a high level, the third logic module outputs a high-level second disconnection signal Relay2_Open, and the second disconnection unit 122 is turned on. At this time, the second attraction unit 121 and the second disconnection unit 122 are turned on at the same time, and the combined force on the iron core in the relay is zero. The states of the second relay RLY2 and the third relay RLY3 do not change, and they can still remain in a closed state.

[0127] In addition, if the first enable signal Relay1_EN or the second enable signal Relay2_EN changes from a high level to a low level, the two coils of the corresponding relay will not be energized and can still maintain the original state.

[0128] The above mainly describes the situation of a single point failure, that is, the situation when a single drive signal changes. The following describes the situation when two drive signals change.

[0129] If the first driving signal Relay_A changes from high level to low level, and the second driving signal Relay_B changes from low level to high level, the first logic module outputs a high level first pull-in signal Relay1_Closed and a low level second pull-in signal Relay2_Closed, at which time, the first pull-in unit 111 and the first disconnection unit 112 are turned on, and the second pull-in unit 121 and the second disconnection unit 122 are turned off. That is, the two coils of the first relay RLY1 are energized at the same time, wherein the resultant force on the iron core is zero, the first relay RLY1 does not change, and can still maintain a disconnected state; the two coils of the second relay RLY2 and the two coils of the third relay RLY3 are not energized, and accordingly, the second relay RLY2 and the third relay RLY3 do not change, and can still maintain a closed state.

[0130] If the first drive signal Relay_A changes from a high level to a low level, and the third drive signal Relay_C changes from a high level to a low level, the first logic module outputs a low-level first pull-in signal Relay1_Closed and a low-level second pull-in signal Relay2_Closed, and accordingly, the first pull-in unit 111 and the second pull-in unit 121 are not conducting; the second logic module outputs a low-level first disconnection signal Relay1_Open, and accordingly, the first disconnection unit 112 is not conducting. At this time, the second disconnection unit 122 is not conducting. That is, the coils of the first relay RLY1, the second relay RLY2, and the third relay RLY3 are not energized, and the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 do not change.

[0131] If the second driving signal Relay_B changes from low level to high level, and the third driving signal Relay_C changes from high level to low level, the first logic module outputs a low-level first pull-in signal Relay1_Closed and a low-level second pull-in signal Relay2_Closed; the second logic module outputs a low-level first disconnection signal Relay1_Open. As above, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 will not change.

[0132] In addition, if the first enable signal Relay1_EN and the second enable signal Relay2_EN change from high level to low level, the two coils of the relay will not be energized, and the first relay RLY1 , ​​the second relay RLY2 and the third relay RLY3 can still maintain their original states.

[0133] If one of the first enable signal Relay1_EN and the second enable signal Relay2_EN changes, and one of the other four signals changes, the states of the first relay RLY1, the second relay RLY2 and the third relay RLY3 will not change. For details, please refer to the above single point failure situation.

[0134] When the first enable signal Relay1_EN is high, the second enable signal Relay2_EN is high, the first drive signal Relay_A is low, the second drive signal Relay_B is high, the third drive signal Relay_C is low, and the fourth drive signal Relay_D is high: For the first relay RLY1, the first enable signal Relay1_EN is at a high level, and the first enable unit 113 is turned on. The first logic module outputs a high-level first pull-in signal Relay1_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the first pull-in unit 111 is turned on. The second logic module outputs a low-level first disconnection signal Relay1_Open according to the third drive signal Relay_C, and the first disconnection unit 112 is not turned on. That is, the first enable unit 113 and the first pull-in unit 111 are turned on, and the first relay RLY1 is closed.

[0135] For the second relay RLY2 and the third relay RLY3, the second enable signal Relay2_EN is at a high level, and the second enable unit 123 is turned on. The first logic module outputs a low-level second pull-in signal Relay2_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the second pull-in unit 121 is not turned on. The third logic module outputs a high-level second disconnection signal Relay2_Open according to the fourth drive signal Relay_D, and the second disconnection unit 122 is turned on. That is, the second enable unit 123 and the second disconnection unit 122 are turned on, and the second relay RLY2 and the third relay RLY3 are turned off.

[0136] Based on this, the charging pile operates at high voltage.

[0137] In the above case, if the second drive signal Relay_B changes from a high level to a low level, the first logic module outputs a low-level first attraction signal Relay1_Closed and a low-level second attraction signal Relay2_Closed, and the first attraction unit 111 and the second attraction unit 121 are not conductive. At this time, the first disconnection unit 112 is also not conductive, the first relay RLY1 remains in a closed state, and the second relay RLY2 remains in a disconnected state, and the relay will not malfunction due to erroneous changes in the signal.

[0138] If the first driving signal Relay_A changes from a low level to a high level, the first logic module outputs a low-level first closure signal Relay1_Closed and a low-level second closure signal Relay2_Closed. As can be seen from the above, the first relay RLY1, the second relay RLY2 and the third relay RLY3 remain in their original states, and the relays will not malfunction due to erroneous changes in the signal.

[0139] If the fourth driving signal Relay_D changes from high level to low level, the third logic module outputs the second disconnection signal Relay2_Open of low level, the second disconnection unit 122 is not turned on, and the second pull-in unit 121 is not turned on, the second relay RLY2 and the third relay RLY3 remain in the disconnected state, and the relay will not malfunction according to the erroneous change of the signal. The charging pile can still work normally.

[0140] If the third driving signal Relay_C changes from a low level to a high level, the second logic module outputs a high-level first disconnection signal Relay1_Open, and the first disconnection unit 112 is turned on. At this time, the first attraction unit 111 and the first disconnection unit 112 are turned on at the same time, and the combined force on the iron core in the relay is zero. The state of the first relay RLY1 does not change and can still remain in a closed state.

[0141] The above mainly describes the situation of single point failure, that is, the situation when a single driving signal changes. The following describes the situation when two driving signals change at the same time.

[0142] If the first driving signal Relay_A changes from low level to high level, and the second driving signal Relay_B changes from high level to low level, the first logic module outputs a low-level first pull-in signal Relay1_Closed and a high-level second pull-in signal Relay2_Closed, the first pull-in unit 111 and the first disconnection unit 112 are not conducting, and the second pull-in unit 121 and the second disconnection unit 122 are conducting. Therefore, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 remain unchanged.

[0143] If the second drive signal Relay_B changes from high level to low level, and the fourth drive signal Relay_D changes from high level to low level, the first logic module outputs a low-level first pull-in signal Relay1_Closed and a low-level second pull-in signal Relay2_Closed, and the third logic module outputs a low-level second disconnection signal Relay2_Open, and accordingly, the first pull-in unit 111, the second pull-in unit 121, the first disconnection unit 112, and the second disconnection unit 122 are all turned off. Therefore, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 do not change.

[0144] If the first driving signal Relay_A changes from low level to high level, and the fourth driving signal Relay_D changes from high level to low level, the first logic module outputs a low-level first pull-in signal Relay1_Closed and a low-level second pull-in signal Relay2_Closed, and the third logic module outputs a low-level second disconnection signal Relay2_Open. As in the above case, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 will not change.

[0145] For the case where the first enable signal Relay1_EN or the second enable signal Relay2_EN changes, reference can be made to the case where the charging pile operates in the low voltage gear, which will not be described in detail here.

[0146] In summary, for the pull-in signal and the disconnection signal, only when the pull-in signal and the disconnection signal corresponding to the relay in the closed state change at the same time, considering the accurate control of the relay, the magnetic holding relay control circuit will control the relay to perform corresponding actions. In other cases, when the two signals change or only one signal changes, the relay can still maintain its original state without changing, which can reduce the occurrence of relay misoperation and ensure the normal operation of the charging pile.

[0147] For the enable signal, when the enable signal changes, the coil of the corresponding relay is not energized, and the relay can still maintain its original state without changing, which can reduce the occurrence of relay malfunctions and ensure the normal operation of the charging pile.

[0148] In addition, when the first enable signal Relay1_EN is high, the second enable signal Relay2_EN is high, the first drive signal Relay_A is low, the second drive signal Relay_B is low, the third drive signal Relay_C is high, and the fourth drive signal Relay_D is high: For the first relay RLY1, the first enable signal Relay1_EN is at a high level, and the first enable unit 113 is turned on. The first logic module outputs a low-level first pull-in signal Relay1_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the first pull-in unit 111 is not turned on. The second logic module outputs a high-level first disconnection signal Relay1_Open according to the third drive signal Relay_C, and the first disconnection unit 112 is turned on. That is, the first enable unit 113 and the first disconnection unit 112 are turned on, and the first relay RLY1 is turned off.

[0149] For the second relay RLY2 and the third relay RLY3, the second enable signal Relay2_EN is at a high level, and the second enable unit 123 is turned on. The first logic module outputs a low-level second pull-in signal Relay2_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the second pull-in unit 121 is not turned on. The third logic module outputs a high-level second disconnection signal Relay2_Open according to the fourth drive signal Relay_D, and the second disconnection unit 122 is turned on. That is, the second enable unit 123 and the second disconnection unit 122 are turned on, and the second relay RLY2 and the third relay RLY3 are turned off.

[0150] At this time, the relays of the high-voltage gear and the low-voltage gear are both disconnected, and the charging unit of the charging pile does not work.

[0151] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0152] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A magnetic latching relay control circuit, characterized in that: The magnetic latching relay control circuit includes a first driving module; the first driving module includes a first pull-in unit, a first disconnection unit and a first enabling unit; the magnetic latching relay control circuit is used for a magnetic latching relay group, and the magnetic latching relay group includes a first relay provided with a first coil and a second coil; The first enabling unit is connected to the first coil via the first attracting unit, and the first enabling unit is connected to the second coil via the first disconnecting unit; The input end of the first enabling unit is used to input a first enabling signal, the input end of the first attracting unit is used to input a first attracting signal, and the input end of the first disconnecting unit is used to input a first disconnecting signal; When the first enabling signal and the first attracting signal are high level signals, the first enabling unit, the first attracting unit and the first coil are connected to control the first relay to be closed; When the first enabling signal and the first disconnecting signal are high-level signals, the first enabling unit, the first disconnecting unit, and the second coil are connected to control the first relay to be disconnected.

2. The magnetic latching relay control circuit according to claim 1, characterized in that: The relay group further includes a second relay provided with a third coil and a fourth coil; the first relay and the second relay are applied to a charging unit; the charging unit includes a first converter and a second converter; One of the first relay and the second relay is connected between the second output terminal of the first converter and the first output terminal of the second converter; the other of the first relay and the second relay is connected between the first output terminal of the first converter and the first output terminal of the second converter, or between the second output terminal of the first converter and the second output terminal of the second converter; The magnetic latching relay control circuit also includes a second driving module; the second driving module includes a second pickup unit, a second disconnection unit and a second enabling unit; The second enabling unit is connected to the third coil via the second attracting unit, and the second enabling unit is connected to the fourth coil via the second disconnecting unit; The input end of the second enabling unit is used to input a second enabling signal, the input end of the second attracting unit is used to input a second attracting signal, and the input end of the second disconnecting unit is used to input a second disconnecting signal; When the second enabling signal and the second attracting signal are high level signals, the second enabling unit, the second attracting unit and the third coil are connected to control the second relay to be closed; When the second enabling signal and the second disconnecting signal are high level signals, the second enabling unit, the second disconnecting unit and the fourth coil are connected to control the second relay to be disconnected; The first pull-in signal and the second pull-in signal are not high level signals at the same time.

3. The magnetic latching relay control circuit according to claim 2, characterized in that: The magnetic latching relay control circuit further includes a first logic module; the first logic module includes a first NOT gate, a first AND gate, a second NOT gate and a second AND gate; The first input end of the first AND gate inputs the first driving signal through the first NOT gate; the second input end of the first AND gate is used to input the second driving signal; the output end of the first AND gate is connected to the input end of the first pull-in unit; the first AND gate generates the first pull-in signal and inputs it to the first pull-in unit; The first input end of the second AND gate inputs the second drive signal through the second NOT gate; the second input end of the second AND gate is used to input the first drive signal; the output end of the second AND gate is connected to the input end of the second attraction unit; the second AND gate generates the second attraction signal and inputs it to the second attraction unit.

4. The magnetic latching relay control circuit according to claim 2, characterized in that: The relay group further includes a third relay provided with a fifth coil and a sixth coil; The third relay is connected in parallel with the first relay; the first enabling unit is connected to the fifth coil via the first pickup unit, and the first enabling unit is connected to the sixth coil via the first disconnection unit; Alternatively, the third relay is connected in parallel with the second relay; the second enabling unit is connected to the fifth coil via the second attraction unit, and the second enabling unit is connected to the sixth coil via the second disconnection unit.

5. The magnetic latching relay control circuit according to any one of claims 1 to 4, characterized in that: The first pull-in unit includes a first transistor, the first disconnection unit includes a second transistor, and the first enabling unit includes a third transistor; The first end of the third triode is connected to the second end of the first triode and the second end of the second triode respectively; the second end of the third triode is used for grounding; the first end of the first triode is used for connecting the first coil, and the first end of the second triode is used for connecting the second coil; The third end of the first transistor is used to input the first pull-in signal, the third end of the second transistor is used to input the first disconnection signal, and the third end of the third transistor is used to input the first enable signal.

6. The magnetic latching relay control circuit according to any one of claims 2 to 4, characterized in that: The second pull-in unit includes a fourth transistor, the second disconnection unit includes a fifth transistor, and the second enabling unit includes a sixth transistor; The first end of the sixth triode is connected to the second end of the fourth triode and the second end of the fifth triode respectively; the second end of the sixth triode is used for grounding; the first end of the fourth triode is used for connecting the first coil, and the first end of the fifth triode is used for connecting the second coil; The third end of the fourth transistor is used to input the second pull-in signal, the third end of the fifth transistor is used to input the second disconnection signal, and the third end of the sixth transistor is used to input the second enable signal.

7. A charging pile, characterized in that: comprising at least one charging unit; Each charging unit includes a first converter, a magnetic latching relay group, and a magnetic latching relay control circuit as claimed in any one of claims 1 to 6.

8. The charging pile according to claim 7, characterized in that: The magnetic latching relay group includes a first relay; An output terminal of the first converter is connected to the first relay; and the magnetic latching relay control circuit is connected to the first relay.

9. The charging pile according to claim 7, characterized in that: Each charging unit also includes a second converter; the magnetic latching relay group includes a first relay; The second output end of the first converter is connected to the first output end of the second converter through a first relay; and the magnetic latching relay control circuit is connected to the first relay.

10. The charging pile according to claim 7 or 9, characterized in that: Each charging unit also includes a second converter; the magnetic latching relay group includes a second relay and a third relay; The first output end of the first converter is connected to the first output end of the second converter through the second relay, and the second output end of the first converter is connected to the second output end of the second converter through the third relay.

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