Magnetic latching relay control circuit and charging pile

Abstract

The present application provides a magnetic latching relay control circuit and a charging pile. The magnetic latching relay control circuit includes a first driving module; the first driving module includes a first latching unit, a first disconnecting unit and a first enabling unit; the first enabling unit is connected to a first coil through the first latching unit, and the first enabling unit is connected to a second coil through the first disconnecting unit; the input end of the first enabling unit is used for inputting a first enabling signal, the input end of the first latching unit is used for inputting a first latching signal, and the input end of the first disconnecting unit is used for inputting a first disconnecting signal; when the first enabling signal and the first latching signal are high-level signals, the first enabling unit, the first latching unit and the first coil are connected, controlling the first relay to close; 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, controlling the first relay to open. The present application can reduce the occurrence of malfunction of the relay.

Description

Technical Field

[0001] This application relates to the technical field of relay control, and particularly to a magnetic latching relay control circuit and a charging pile. Background Art

[0002] A relay is an electrical control device used to control the on / off of a circuit, and thus can control the operating state of a load. The driving of a relay is usually achieved through an enable signal. Generally, an enable signal is input into the driving circuit of the relay, and the energization and disconnection of the relay are controlled by the change of the enable signal. However, when a fault occurs in the electronic devices in the circuit, such as a single-point fault, which causes a change in the enable signal actually received by the relay, the relay will malfunction according to the changed enable signal, affecting the normal use of the load. Summary of the Invention

[0003] An embodiment of this application provides 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 this application provides a magnetic latching relay control circuit. The magnetic latching relay control circuit includes a first driving module; the first driving module includes a first latching 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;

[0005] The first enabling unit is connected to the first coil through the first latching unit, and the first enabling unit is connected to the second coil through the first disconnection unit;

[0006] The input end of the first enabling unit is used to input a first enabling signal, the input end of the first latching unit is used to input a first latching signal, and the input end of the first disconnection unit is used to input a first disconnection signal;

[0007] When the first enabling signal and the first latching signal are high-level signals, the first enabling unit, the first latching unit, and the first coil are connected, controlling the first relay to close;

[0008] When the first enabling signal and the first disconnection signal are high-level signals, the first enabling unit, the first disconnection unit, and the second coil are connected, controlling the first relay to disconnect.

[0009] 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;

[0010] 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 is connected between the second output terminal of the first converter and the second output terminal of the second converter;

[0011] The magnetic latching relay control circuit further includes a second driving module; the second driving module includes a second attracting unit, a second disconnecting unit, and a second enabling unit;

[0012] The second enabling unit is connected to the third coil through the second attracting unit, and the second enabling unit is connected to the fourth coil through the second disconnecting unit;

[0013] The input end of the second enabling unit is used for inputting a second enabling signal, the input end of the second attracting unit is used for inputting a second attracting signal, and the input end of the second disconnecting unit is used for inputting a second disconnecting signal;

[0014] 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, and the second relay is controlled to close;

[0015] 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, and the second relay is controlled to disconnect;

[0016] Wherein, the first attracting signal and the second attracting signal are not high-level signals at the same time.

[0017] In a possible implementation manner, 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;

[0018] The first input end of the first AND gate inputs a first driving signal through the first NOT gate; the second input end of the first AND gate is used for inputting a second driving signal; the output end of the first AND gate is connected to the input end of the first attracting unit; the first AND gate generates the first attracting signal and inputs it to the first attracting unit;

[0019] The first input terminal of the second AND gate inputs a second driving signal through the second NOT gate; the second input terminal of the second AND gate is used to input a first driving signal; the output terminal of the second AND gate is connected to the input terminal of the second pulling-in unit; the second AND gate generates the second pulling-in signal and inputs it to the second pulling-in unit.

[0020] In a possible implementation manner, the relay group further includes a third relay provided with a fifth coil and a sixth coil;

[0021] The third relay is connected in parallel with the first relay; the first enabling unit is connected to the fifth coil through the first pulling-in unit, and the first enabling unit is connected to the sixth coil through the first disconnecting unit.

[0022] Alternatively, the third relay is connected in parallel with the second relay; the second enabling unit is connected to the fifth coil through the second pulling-in unit, and the second enabling unit is connected to the sixth coil through the second disconnecting unit.

[0023] In a possible implementation manner, the first pulling-in unit includes a first triode, the first disconnecting unit includes a second triode, and the first enabling unit includes a third triode;

[0024] The first end of the third triode is respectively connected to the second end of the first triode and the second end of the second triode; the second end of the third triode is used for grounding; the first end of the first triode is used for connecting to the first coil, and the first end of the second triode is used for connecting to the second coil;

[0025] The third end of the first triode is used for inputting the first pulling-in signal, the third end of the second triode is used for inputting the first disconnecting signal, and the third end of the third triode is used for inputting the first enabling signal.

[0026] In a possible implementation manner, the second pulling-in unit includes a fourth triode, the second disconnecting unit includes a fifth triode, and the second enabling unit includes a sixth triode;

[0027] The first end of the sixth triode is respectively connected to the second end of the fourth triode and the second end of the fifth triode; the second end of the sixth triode is used for grounding; the first end of the fourth triode is used for connecting to the first coil, and the first end of the fifth triode is used for connecting to the second coil;

[0028] The third end of the fourth triode is used for inputting the second pulling-in signal, the third end of the fifth triode is used for inputting the second disconnecting signal, and the third end of the sixth triode is used for inputting the second enabling signal.

[0029] In a second aspect, an embodiment of the present application provides a charging pile, including at least one charging unit;

[0030] 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 manner of the first aspect above.

[0031] In a possible implementation manner, the magnetic latching relay group includes a first relay;

[0032] One output terminal of the first converter is connected to the first relay; the magnetic latching relay control circuit is connected to the first relay.

[0033] In a possible implementation manner, each charging unit further includes a second converter; the magnetic latching relay group includes a first relay;

[0034] The second output terminal of the first converter is connected to the first output terminal of the second converter through the first relay; the magnetic latching relay control circuit is connected to the first relay.

[0035] In a possible implementation manner, each charging unit further includes a second converter; the magnetic latching relay group includes a second relay and a third relay;

[0036] The first output terminal of the first converter is connected to the first output terminal of the second converter through the second relay, and the second output terminal of the first converter is connected to the second output terminal of the second converter through the third relay.

[0037] The beneficial effects of the embodiment of the present application compared with the prior art are as follows:

[0038] 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 latching relay control circuit is connected to the first coil through the first latching unit, and the first enabling unit is connected to the second coil through the first disconnecting unit. When the first enabling signal input to the first enabling unit and the first latching signal input to the first latching unit are high-level signals, the first enabling unit, the first latching unit, and the first coil are connected, and the first relay can be controlled to close. When the first enabling signal and the first disconnecting signal input to the first disconnecting unit are high-level signals, the first enabling unit, the first disconnecting unit, and the second coil are connected, and the first relay can be controlled to disconnect; when the first latching signal or the first disconnecting signal changes from high level to low level, the coil will not be connected, and thus no reverse current will be input, which can avoid the change of the relay state with incorrect signals and reduce the occurrence of relay malfunction, ensuring the normal use of the load. Description of the Drawings

[0039] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of the application of the magnetic latching relay control circuit provided by the embodiment of the present application;

[0041] Figure 2 It is a schematic structural diagram of the magnetic latching relay control circuit provided by the embodiment of the present application;

[0042] Figure 3 It is a circuit structure diagram of the first driving module provided by the embodiment of the present application;

[0043] Figure 4 It is another schematic structural diagram of the magnetic latching relay control circuit provided by the embodiment of the present application;

[0044] Figure 5 It is a circuit structure diagram of the second driving module provided by the embodiment of the present application;

[0045] Figure 6 It is a circuit structure diagram of the first logic module provided by the embodiment of the present application;

[0046] Figure 7 It is a circuit structure diagram of the second logic module provided by the embodiment of the present application;

[0047] Figure 8 It is a circuit structure diagram of the third logic module provided by the embodiment of the present application;

[0048] Figure 9 It is a circuit structure diagram of the first enabling module provided by the embodiment of the present application;

[0049] Figure 10 It is a schematic structural diagram of the first type of charging pile provided by the embodiment of the present application;

[0050] Figure 11 It is a schematic structural diagram of the second type of charging pile provided by the embodiment of the present application;

[0051] Figure 12 It is a schematic structural diagram of the third type of charging pile provided by the embodiment of the present application;

[0052] Figure 13 It is a schematic structural diagram of the fourth type of charging pile provided by the embodiment of the present application. Specific embodiments

[0053] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should understand that the present application can 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 avoid unnecessary details from interfering with the description of the present application.

[0054] The inventor of the present application has found that in order to control a relay, usually an enabling signal is used to input the drive circuit of the relay, and the relay is controlled by the change of the enabling signal. However, when a fault occurs in the circuit of the enabling signal, the enabling signal may change from a high level to a low level, which may cause the relay to malfunction and affect the normal use of the load.

[0055] In addition, relays can also be applied in charging piles. Since there are different charging modes in charging piles, 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 to be in the first charging mode, and a low-voltage relay can be set to control the charging pile to be in the second charging mode. When the enabling signal changes erroneously, it may cause the charging mode of the charging pile to change, or the charging pile to operate in an abnormal mode, or even cause device damage.

[0056] Therefore, it is necessary to consider a control circuit for a relay.

[0057] For the purpose of accurately controlling the relay and reducing the occurrence of relay malfunction, in the embodiments of the present application, the relay is controlled by a first enabling unit, a first pulling-in unit, and a first disconnecting unit. By inputting a first enabling signal to the first enabling unit and a first pulling-in signal to the first pulling-in unit, the first relay is controlled to close. By the first enabling signal and a first disconnecting signal input to the first disconnecting unit, the first relay is controlled to disconnect. The relay can be made to close only when the first enabling signal and the first pulling-in signal are at a high level, and to disconnect only when the first enabling signal and the first disconnecting signal are at a high level, and not to operate in other cases, thus reducing the occurrence of relay malfunction.

[0058] To make the objectives, technical solutions, and advantages of the present application clearer, the following will be described through specific embodiments with reference to the accompanying drawings.

[0059] As Figure 1 shown, the magnetic latching relay control circuit provided in the embodiments of the present application can be applied in a charging pile. The charging pile can include at least one charging unit, and each charging unit can include a magnetic latching relay control circuit 1, a magnetic latching relay group 2, and a first converter 3.

[0060] The magnetic holding relay control circuit 1 provided by the embodiments of the present application can be used to drive the relays in the magnetic holding relay group 2. Refer to Figure 2 A schematic structural diagram of the magnetic holding relay control circuit shown. The magnetic holding relay group 2 includes a first relay RLY1 provided with a first coil 211 and a second coil 212. The magnetic holding relay control circuit 1 includes a first driving module; the first driving module includes a first closing unit 111, a first opening unit 112, and a first enabling unit 113.

[0061] The first enabling unit 113 is connected to the first coil 211 through the first closing unit 111, and the first enabling unit 113 is connected to the second coil 212 through the first opening unit 112.

[0062] The input end of the first enabling unit 113 is used to input a first enabling signal Relay1_EN, the input end of the first closing unit 111 is used to input a first closing signal Relay1_Closed, and the input end of the opening unit is used to input a first opening signal Relay1_Open.

[0063] When the first enabling signal Relay1_EN and the first closing signal Relay1_Closed are high-level signals, i.e., "1", the first enabling unit 113, the first closing unit 111, and the first coil 211 are connected, controlling the first relay RLY1 to close.

[0064] When the first enabling signal Relay1_EN and the first opening signal Relay1_Open are high-level signals, i.e., "1", the first enabling unit 113, the first opening unit 112, and the second coil 212 are connected, controlling the first relay RLY1 to open.

[0065] Here, the connection point of the first coil 211 and the second coil 212 is also connected to a power supply, specifically, it can be connected to the positive pole of a DC power supply. The first enabling unit 113 is also connected to a reference ground, and the reference ground can be the negative pole of the corresponding DC power supply. In Figure 2 0V_DC is used to represent the reference ground, 0V represents the voltage of the reference ground of the circuit, and DC represents direct current. For convenience of representation, hereinafter, "grounding" is used to represent connecting to the reference ground 0V_DC.

[0066] When the first relay RLY1 is closed, if the first closing signal Relay1_Closed changes from the high level "1" to the low level "0", at this time, the first enabling unit 113, the first closing unit 111 and the first coil 211 are not connected, and the first enabling unit 113, the first opening unit 112 and the second coil 212 are not connected. Then, there is no current input in the first relay RLY1 in the direction opposite to the closed state, and it can still maintain the closed state, and the relay will not malfunction. If the first opening signal Relay1_Open changes from the low level "0" to the high level "1", at this time, the first enabling unit 113, the first opening unit 112 and the second coil 212 are connected, and the first enabling unit 113, the first closing unit 111 and the first coil 211 are connected. The magnetic field directions generated by the two coils of the first relay RLY1 are opposite and the intensities are the same. The resultant force on the iron core of the first relay RLY1 is zero, and it can maintain the current state unchanged, that is, remain closed.

[0067] When the first relay RLY1 is open, if the first opening signal Relay1_Open changes from the high level "1" to the low level "0", at this time, the first enabling unit 113, the first opening unit 112 and the second coil 212 are not connected, and the first enabling unit 113, the first closing unit 111 and the first coil 211 are not connected. Then, there is no current input in the first relay RLY1 in the direction opposite to the open state, and it can still maintain the open state, and the relay will not malfunction. If the first closing signal Relay1_Closed changes from the low level "0" to the high level "1", at this time, the first enabling unit 113, the first closing unit 111 and the first coil 211 are connected, and the first enabling unit 113, the first opening 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 it can still maintain the current state unchanged.

[0068] In addition, if the first enabling signal Relay1_EN changes from the high level "1" to the low level "0", then the first enabling unit 113 will be disconnected. At this time, both the first closing signal Relay1_Closed and the first opening signal Relay1_Open do not work, and neither the first coil 211 nor the second coil 212 is powered on. The first relay RLY1 can still maintain the current state unchanged. However, when it is necessary to change the state of the first relay RLY1, it is necessary to ensure that the first enabling signal Relay1_EN is at the high level.

[0069] 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 attracting unit, and the first enabling unit is connected to the second coil through the first disconnecting unit. When the first enabling signal input to the first enabling unit and the first attracting signal input to the first attracting unit are high-level signals, the first enabling unit, the first attracting unit, and the first coil are connected, and the first relay can be controlled to close. When the first enabling signal and the first disconnecting signal input to the first disconnecting unit are high-level signals, the first enabling unit, the first disconnecting unit, and the second coil are connected, and the first relay can be controlled to open; when the first attracting signal or the first disconnecting signal changes from high level to low level, the coils are not connected, and no reverse current is input, which can prevent the state of the relay from changing with incorrect signals and reduce the occurrence of relay malfunction, ensuring the normal use of the load. Among them, by connecting the first attracting unit and the first disconnecting unit to the two coils of the first relay respectively and controlling the state of the first relay through the first attracting signal and the first disconnecting signal, the control of the 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, reducing the occurrence of relay malfunction.

[0070] In some embodiments, referring to Figure 3 the circuit structure diagram of the first driving module shown, the first attracting unit 111 includes a first triode Q1, the first disconnecting unit 112 includes a second triode Q2, and the first enabling unit 113 includes a third triode Q3;

[0071] The first end of the third triode Q3 is respectively connected to the second end of the first triode Q1 and the second end of the second triode Q2; the second end of the third triode Q3 is used for grounding; the first end of the first triode Q1 is used for connecting to the first coil 211, and the first end of the second triode Q2 is used for connecting to the second coil 212;

[0072] The third end of the first triode Q1 is used for inputting the first attracting signal Relay1_Closed, the third end of the second triode Q2 is used for inputting the first disconnecting signal Relay1_Open, and the third end of the third triode Q3 is used for inputting the first enabling signal Relay1_EN.

[0073] In this embodiment, the first suction signal Relay1_Closed is a high-level signal, that is, "1", which is input to the base of the first triode Q1, enabling the first triode Q1 to conduct. The first enable signal Relay1_EN is a high-level signal, that is, "1", which is input to the base of the third triode Q3, enabling the third triode Q3 to conduct. Correspondingly, when the first triode Q1 and the third triode Q3 are conducting, the first coil 211 of the first relay RLY1 is energized, thereby enabling the first relay RLY1 to close.

[0074] The first disconnection signal Relay1_Open is a high-level signal, that is, "1", which is input to the base of the second triode Q2, enabling the second triode Q2 to conduct. The first enable signal Relay1_EN is a high-level signal, that is, "1", which is input to the base of the third triode Q3, enabling the third triode Q3 to conduct. Correspondingly, when the second triode Q2 and the third triode Q3 are conducting, the second coil 212 of the first relay RLY1 is energized, thereby enabling the first relay RLY1 to disconnect.

[0075] Here, when it is necessary to control the first relay RLY1 to close, the first suction signal Relay1_Closed is a high-level signal, that is, "1", and the first disconnection signal Relay1_Open is a low-level signal, that is, "0". When it is necessary to control the first relay RLY1 to disconnect, the first disconnection signal Relay1_Open is a high-level signal, that is, "1", and the first suction signal Relay1_Closed is a low-level signal, that is, "0". That is, the first suction signal Relay1_Closed and the first disconnection signal Relay1_Open will not be high-level signals simultaneously.

[0076] Optionally, referring to Figure 3 the circuit structure diagram of the first driving module shown, the first suction unit 111 of this embodiment further includes a first suction resistor R11, a second suction resistor R12, and a first suction capacitor C11. The third terminal (i.e., the base) of the first triode Q1 is respectively connected to the first end of the first suction resistor R11, the first end of the second suction resistor R12, and the first end of the first suction capacitor C11. The second end of the first suction resistor R11 is used to input the first suction signal Relay1_Closed. The second ends of the second suction resistor R12 and the first suction capacitor C11 are connected and grounded.

[0077] The first disconnection unit 112 further includes a first resistor R21, a second resistor R22, and a first disconnection capacitor C21. The third terminal (i.e., the base) of the second triode Q2 is respectively connected to the first terminal of the first resistor R21, the first terminal of the second resistor R22, and the first terminal of the first disconnection capacitor C21. The second terminal of the first resistor R21 is used for inputting a first disconnection signal Relay1_Open. The second terminal of the second resistor R22 and the second terminal of the first disconnection capacitor C21 are connected and then grounded.

[0078] The first enabling unit 113 further includes a first enabling resistor R31, a second enabling resistor R32, and a first enabling capacitor C31. The third terminal (i.e., the base) of the third triode Q3 is respectively connected to the first terminal of the first enabling resistor R31, the first terminal of the second enabling resistor R32, and the first terminal of the first enabling capacitor C31. The second terminal of the first enabling resistor R31 is used for inputting a first enabling signal Relay1_EN. The second terminal of the second enabling resistor R32 and the second terminal of the first enabling capacitor C31 are connected and then grounded.

[0079] 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. Among them, 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 of the first coil 211 and the second coil 212 is used to connect to a power supply (such as Figure 3 the controlled power supply +12V_S of +12V in the example), and this connection point is also connected to the first terminal of the first capacitor C1 and the first terminal of the second capacitor C2. The second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are connected and then grounded.

[0080] 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.

[0081] In some embodiments, referring to Figure 4 another schematic structural diagram of the magnetic latching relay control circuit shown, the magnetic latching relay group 2 further 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.

[0082] Optionally, the first relay RLY1 and the second relay RLY2 can respectively control the first converter and the second converter. For example, the first relay RLY1 can be connected in series with the first converter to control the output of the first converter by using the first relay RLY1; the second relay RLY2 can be connected in series with the second converter to control the output of the second converter by using the second relay RLY2.

[0083] In this embodiment, the first relay RLY1 and the second relay RLY2 can be connected in parallel, and the first driving module can be used to control the first relay RLY1 and the second relay RLY2 simultaneously. Optionally, a second driving module can be additionally provided to control the second relay RLY2 using the second driving module.

[0084] Optionally, the first relay RLY1 and the second relay RLY2 can also control the first converter and the second converter in different ways.

[0085] One of the first relay RLY1 and the second relay RLY2 is connected between the second output terminal of the first converter and the first output terminal of the second converter, and the first converter and the second converter can be connected in series to output high voltage; the other of the first relay RLY1 and the second relay RLY2 is connected between the first output terminal of the first converter and the first output terminal of the second converter, or is connected between the second output terminal of the first converter and the second output terminal of the second converter, and low voltage output can be performed using only the first converter or the second converter output.

[0086] Exemplarily, the first converter and the second converter are connected in series using the first relay RLY1 to output high voltage, that is, the second output terminal of the first converter is connected to the first output terminal of the second converter through the first relay RLY1. The second relay RLY2 is connected to the first converter to output low voltage, that is, the first output terminal of the first converter is connected to the first output terminal of the second converter through the second relay RLY2.

[0087] In this embodiment, the magnetic latching relay control circuit 1 can further include a second driving module; the second driving module includes a second latching unit 121, a second disconnecting unit 122, and a second enabling unit 123.

[0088] The second enabling unit 123 is connected to the third coil 221 through the second latching unit 121, and the second enabling unit 123 is connected to the fourth coil 222 through the second disconnecting unit 122.

[0089] The input terminal of the second enabling unit 123 is used to input a second enabling signal Relay2_EN, the input terminal of the second latching unit 121 is used to input a second latching signal Relay2_Closed, and the input terminal of the second disconnecting unit 122 is used to input a second disconnecting signal Relay2_Open;

[0090] When the second enabling signal Relay2_EN and the second latching signal Relay2_Closed are high level signals, that is, "1", the second enabling unit 123, the second latching unit 121, and the third coil 221 are connected, and the second relay RLY2 is controlled to close;

[0091] When the second enabling signal Relay2_EN and the second disconnection signal Relay2_Open are high-level signals, i.e., "1", the second enabling unit 123, the second disconnection unit 122, and the fourth coil 222 are connected, controlling the second relay RLY2 to disconnect.

[0092] Here, the connection point of the third coil 221 and the fourth coil 222 is also connected to a power supply, specifically, it can be connected to the positive pole of a DC power supply. The second enabling unit 123 is also connected to the reference ground 0V_DC.

[0093] When the second relay RLY2 is closed, if the second closing signal Relay2_Closed changes from a high level "1" to a low level "0", at this time, the second enabling unit 123, the second closing unit 121, and the third coil 221 are not connected, and the second enabling unit 123, the second disconnection unit 122, and the fourth coil 222 are not connected. Then, there is no current input in the second relay RLY2 in the direction opposite to the closed state, and it can still maintain the closed state, and the relay will not malfunction. If the second disconnection 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, the magnetic field directions generated by the two coils of the second relay RLY2 are opposite and the intensities are the same, 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.

[0094] 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 closing unit 121, and the third coil 221 are not connected. Then, there is no current input in the second relay RLY2 in the direction opposite to the open state, and it can still maintain the open state, and the relay will not malfunction. If the second closing 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, it remains open.

[0095] In addition, the function of the second enabling signal Relay2_EN for the second relay RLY2 is the same as that of the first enabling signal Relay1_EN for the first relay RLY1, and reference can be made to the above description of the first enabling signal Relay1_EN.

[0096] 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 simultaneously. Correspondingly, when the first enable signal Relay1_EN and the second enable signal Relay2_EN are both at high level, the first closing signal Relay1_Closed and the second closing signal Relay2_Closed are not both at high level simultaneously.

[0097] In some embodiments, referring to Figure 5 the circuit structure diagram of the second driving module shown, the second closing unit 121 includes a fourth triode Q4, the second opening unit 122 includes a fifth triode Q5, and the second enabling unit 123 includes a sixth triode Q6.

[0098] The first end of the sixth triode Q6 is respectively connected to the second end of the fourth triode Q4 and the second end of the fifth triode Q5; the second end of the sixth triode Q6 is used for grounding; the first end of the fourth triode Q4 is used for connecting to the third coil 221, and the first end of the fifth triode Q5 is used for connecting to the fourth coil 222.

[0099] The third end of the fourth triode Q4 is used for inputting the second closing signal Relay2_Closed, the third end of the fifth triode Q5 is used for inputting the second opening signal Relay2_Open, and the third end of the sixth triode Q6 is used for inputting the second enabling signal Relay2_EN.

[0100] Here, for the control of the second closing signal Relay2_Closed, the second opening signal Relay2_Open, and the second enabling signal Relay2_EN, reference can be made to the description of the first closing signal Relay1_Closed, the first opening signal Relay1_Open, and the first enabling signal Relay1_EN in the above embodiments, and details will not be elaborated here.

[0101] Optionally, referring to Figure 5 the circuit structure diagram of the second driving module shown, the second closing unit 121 of this embodiment further includes a third closing resistor R13, a fourth closing resistor R14, and a second closing capacitor C12.

[0102] The third end (i.e., the base) of the fourth triode Q4 is respectively connected to the first end of the third closing resistor R13, the first end of the fourth closing resistor R14, and the first end of the second closing capacitor C12. The second end of the third closing resistor R13 is used for inputting the second closing signal Relay2_Closed. The second ends of the fourth closing resistor R14 and the second closing capacitor C12 are connected and then grounded.

[0103] The second disconnecting unit 122 further includes a third resistor R23, a fourth resistor R24, and a second disconnecting capacitor C22.

[0104] The third terminal (i.e., the base) of the fifth triode Q5 is respectively connected to the first terminal of the third resistor R23, the first terminal of the fourth resistor R24, and the first terminal of the second disconnecting capacitor C22. The second terminal of the third resistor R23 is used to input a second disconnecting signal Relay2_Open. The second terminals of the fourth resistor R24 and the second disconnecting capacitor C22 are connected and grounded.

[0105] The second enabling unit 123 further includes a third enabling resistor R33, a fourth enabling resistor R34, and a second enabling capacitor C32.

[0106] The third terminal (i.e., the base) of the sixth triode Q6 is respectively connected to the first terminal of the third enabling resistor R33, the first terminal of the fourth enabling resistor R34, and the first terminal of the second enabling capacitor C32. The second terminal of the third enabling resistor R33 is used to input a second enabling signal Relay2_EN. The second terminals of the fourth enabling resistor R34 and the second enabling capacitor C32 are connected and grounded.

[0107] 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. Among them, 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 of the third coil 221 and the fourth coil 222 is used to connect to a power supply (such as Figure 5 the controlled power supply +12V_S of +12V in the example), and this connection point is also connected to the first terminal of the third capacitor C3 and the first terminal of the fourth capacitor C4. The second terminals of the third capacitor C3 and the fourth capacitor C4 are connected and grounded.

[0108] 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 are controlled simultaneously to achieve the switching of the working states.

[0109] In some embodiments, the magnetic latching relay control circuit 1 further includes a first logic module. Refer to Figure 6 the circuit structure diagram of the first logic module shown. 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.

[0110] The first input terminal of the first AND gate AND1 inputs the first drive signal Relay_A through the first NOT gate NOT1; the second input terminal of the first AND gate AND1 is used to input the second drive signal Relay_B; the output terminal of the first AND gate AND1 is connected to the input terminal of the first suction unit 111; the first AND gate AND1 generates the first suction signal Relay1_Closed and inputs it to the first suction unit 111.

[0111] Here, after passing through the first NOT gate NOT1, the first drive signal Relay_A will change from the high level "1" to the low level "0", or from the low level "0" to the high level "1", and then be input to the first AND gate AND1. The second drive signal Relay_B is also input to the first AND gate. The first AND gate will output a signal to the first suction unit 111 according to the two input signals, that is, the first AND gate will generate the first suction signal Relay1_Closed to control the first relay RLY1.

[0112] Among them, the first drive signal Relay_A indicates whether to control the second relay RLY2 to close. When the first drive signal Relay_A is at a high level, it means to control the second relay RLY2 to close. When the first drive signal Relay_A is at a low level, it means not to control the second relay RLY2 to close.

[0113] The second drive signal Relay_B indicates whether to control the first relay RLY1 to close. When the second drive signal Relay_B is at a high level, it means to control the first relay RLY1 to close. When the second drive signal Relay_B is at a low level, it means not to control the first relay RLY1 to close.

[0114] Exemplarily, in a 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 usually do not close 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.

[0115] The first input terminal of the second AND gate AND2 inputs the second drive signal Relay_B through the second NOT gate NOT2; the second input terminal of the second AND gate AND2 is used to input the first drive signal Relay_A; the output terminal of the second AND gate AND2 is connected to the input terminal of the second suction unit 121; the second AND gate AND2 generates the second suction signal Relay2_Closed and inputs it to the second suction unit 121.

[0116] Here, the second driving signal Relay_B passes through the second NOT gate NOT2 and will change 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. The second AND gate AND2 outputs a signal to the second pulling-in unit 121 according to the two input signals, that is, the second AND gate AND2 generates a second pulling-in signal Relay2_Closed to control the second relay RLY2.

[0117] Based on this, when controlling the first relay RLY1 to close or the second relay RLY2 to close, the levels of the first driving signal Relay_A and the second driving signal Relay_B are different. That is, when it is necessary to control the first relay RLY1 to close, the first driving signal Relay_A is at a low level "0", and the second driving signal Relay_B is at a high level "1"; when it is necessary to control the second relay RLY2 to close, the first driving signal Relay_A is at a high level "1", and the second driving signal Relay_B is at a low level "0".

[0118] Optionally, the first logic module may further include a first closing resistor R131, a second closing resistor R132, a third closing resistor R133, a fourth closing resistor R134, a fifth closing resistor R135, a sixth closing resistor R136, a seventh closing resistor R137, an eighth closing resistor R138, a first closing diode D131, a second closing diode D132, a third closing diode D133, a fourth closing diode D134, a fifth closing diode D135, a sixth closing diode D136, a seventh closing diode D137, an eighth closing diode D138, a first closing capacitor C131, and a second closing capacitor C132.

[0119] The input end of the first NOT gate NOT1 is connected to the second input end of the second AND gate AND2. This connection point is respectively connected to the first end of the first closing resistor R131, the first end of the second closing resistor R132, the anode of the first closing diode D131, the cathode of the second closing diode D132, and the first end of the first closing capacitor C131; the second end of the first closing resistor R131 is used to input the first driving signal Relay_A; the cathode of the first closing diode D131 is connected to the power supply (such as Figure 6 the +3.3V auxiliary power supply +3.3V_AS in

[0120] The input terminal of the second NOT gate NOT2 is connected to the second input terminal of the first AND gate AND1. This connection point is respectively connected to the first terminal of the third closed resistor R133, the first terminal 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 terminal of the second closed capacitor C132; the second terminal 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 the +3.3V auxiliary power supply +3.3V_AS in

[0121] The output terminal of the first NOT gate NOT1 is connected to the first input terminal of the first AND gate AND1 through the fifth closed resistor R135; the output terminal of the second NOT gate NOT2 is connected to the first input terminal of the second AND gate AND2 through the sixth closed resistor R136.

[0122] The output terminal of the first AND gate AND1 is connected to the first terminal of the seventh closed resistor R137. The second terminal 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. The first AND gate AND1 outputs the first closing signal Relay1_Closed through the seventh closed resistor R137. Additionally, the cathode of the fifth closed diode D135 is connected to the power supply (for example Figure 6 the +5V auxiliary power supply +5V_AS in

[0123] The output terminal of the second AND gate AND2 is connected to the first terminal of the eighth closed resistor R138. The second terminal 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. The second AND gate AND2 outputs the second closing signal Relay2_Closed through the eighth closed resistor R138. Additionally, the cathode of the seventh closed diode D137 is connected to the power supply (for example Figure 6 the +5V auxiliary power supply +5V_AS in

[0124] In some embodiments, the magnetic latching relay control circuit 1 may further include a second logic module and a third logic module.

[0125] Such as Figure 7As shown, the second logic module includes a third AND gate AND3; the first input terminal of the third AND gate AND3 is used to input a reference voltage, the second input terminal of the third AND gate AND3 is used to input a third drive signal Relay_C, and the output terminal of the third AND gate AND3 is connected to a 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.

[0126] Here, the third drive signal Relay_C indicates whether to control the first relay RLY1 to disconnect. When the third drive signal Relay_C is at a high level, it indicates that the first relay RLY1 is controlled to disconnect. When the third drive signal Relay_C is at a low level, it indicates that the first relay RLY1 is not controlled to disconnect.

[0127] As Figure 8 shown, the third logic module includes a fourth AND gate AND4; the first input terminal of the fourth AND gate AND4 is used to input a reference voltage, the second input terminal of the fourth AND gate AND4 is used to input a fourth drive signal Relay_D, and the output terminal of the fourth AND gate AND4 is connected to a 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.

[0128] Here, the fourth drive signal Relay_D indicates whether to control the second relay RLY2 to disconnect. When the fourth drive signal Relay_D is at a high level, it indicates that the second relay RLY2 is controlled to disconnect. When the fourth drive signal Relay_D is at a low level, it indicates that the second relay RLY2 is not controlled to disconnect.

[0129] Optionally, the second logic module further includes a first disconnection resistor R141, a second disconnection resistor R142, a third disconnection resistor R143, a fourth disconnection resistor R144, a first disconnection diode D141, a second disconnection diode D142, a third disconnection diode D143, a fourth disconnection diode D144, and a third disconnection capacitor C141.

[0130] The second input terminal of the third AND gate AND3 is respectively connected to the first end of the first disconnection resistor R141, the first end of the second disconnection resistor R142, the anode of the first disconnection diode D141, the second disconnection diode D142, and the first end of the third disconnection capacitor C141; the second end of the first disconnection resistor R141 is used to input the third drive signal Relay_C; the cathode of the first disconnection diode D141 is connected to the power supply (for example Figure 7The second terminal of the second disconnecting resistor R142, the anode of the second disconnecting diode D142, and the second terminal of the third disconnecting capacitor C141 are used for grounding.

[0131] The first input terminal of the third AND gate AND3 inputs a reference voltage through the third disconnecting resistor R143.

[0132] The output terminal of the third AND gate AND3 is connected to the first terminal of the fourth disconnecting resistor R144. The second terminal of the fourth disconnecting resistor R144 is connected to the anode of the third disconnecting diode D143 and the cathode of the fourth disconnecting diode D144. The third AND gate AND3 outputs the first disconnecting signal Relay1_Open through the fourth disconnecting resistor R144. Additionally, the cathode of the third disconnecting diode D143 is connected to the power supply (e.g., Figure 7 the +5V auxiliary power supply +5V_AS in the middle); the anode of the fourth disconnecting diode D144 is used for grounding.

[0133] The third logic module further includes a fifth disconnecting resistor R151, a sixth disconnecting resistor R152, a seventh disconnecting resistor R153, an eighth disconnecting resistor R154, a fifth disconnecting diode D151, a sixth disconnecting diode D152, a seventh disconnecting diode D153, an eighth disconnecting diode D154, and a fourth disconnecting capacitor C151.

[0134] The second input terminal of the fourth AND gate AND4 is respectively connected to the first terminal of the fifth disconnecting resistor R151, the first terminal of the sixth disconnecting resistor R152, the anode of the fifth disconnecting diode D151, the sixth disconnecting diode D152, and the first terminal of the fourth disconnecting capacitor C151; the second terminal of the fifth disconnecting resistor R151 is used for inputting the fourth driving signal Relay_D; the cathode of the fifth disconnecting diode D151 is connected to the power supply (e.g., Figure 8 the +3.3V auxiliary power supply +3.3V_AS in the middle); the second terminal of the sixth disconnecting resistor R152, the anode of the sixth disconnecting diode D152, and the second terminal of the fourth disconnecting capacitor C151 are used for grounding.

[0135] The first input terminal of the fourth AND gate AND4 inputs a reference voltage through the seventh disconnecting resistor R153.

[0136] The output terminal of the fourth AND gate AND4 is connected to the first terminal of the eighth disconnecting resistor R154. The second terminal of the eighth disconnecting resistor R154 is connected to the anode of the seventh disconnecting diode D153 and the cathode of the eighth disconnecting diode D154. The fourth AND gate AND4 outputs the second disconnecting signal Relay2_Open through the eighth disconnecting resistor R154. Additionally, the cathode of the seventh disconnecting diode D153 is connected to the power supply (e.g., Figure 7The auxiliary power supply of +5V (+5V_AS); the anode of the eighth disconnecting diode D154 is used to ground.

[0137] In some embodiments, as Figure 5 shown, the magnetic latching relay bank 2 may further include a third relay RLY3 provided with a fifth coil 231 and a sixth coil 232.

[0138] 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 through the first latching unit 111, and the first enabling unit 113 is connected to the sixth coil 232 through the first disconnecting unit 112.

[0139] Alternatively, the third relay RLY3 is connected in parallel with the second relay RLY2; the second enabling unit 123 is connected to the fifth coil 231 through the second latching unit 121, and the second enabling unit 123 is connected to the sixth coil 232 through the second disconnecting unit 122.

[0140] In this embodiment, two relays can be connected in parallel, and the first driving module or the second driving module is used to drive the two relays simultaneously. Here, Figure 5 the case where the third relay RLY3 is connected in parallel with the second relay RLY2 is shown.

[0141] In some 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 a first enabling driving signal Relay_1, and the first enabling module generates a first enabling signal Relay1_EN according to the input first enabling driving signal Relay_1 and inputs it to the first enabling unit 113. The input end of the second enabling module is used to input a second enabling driving signal Relay_2, and the second enabling module generates a second enabling signal Relay2_EN according to the input second enabling driving signal Relay_2 and inputs it to the second enabling unit 123.

[0142] The specific structures of the above two enabling modules are the same. Taking the first enabling module as an example, as Figure 9 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 triode Q161.

[0143] The first end of the fifth enabling resistor R161, the anode of the first enabling diode D161, and the cathode of the second enabling diode D162 are connected, and the connection point serves as the input end of the first enabling module.

[0144] The second terminal of the fifth enabling resistor R161 is respectively connected to the first terminal of the third enabling capacitor C161, the first terminal of the sixth enabling resistor R162, and the third terminal of the first enabling triode Q161.

[0145] The cathode of the first enabling diode D161 is connected to a power supply (such as Figure 9 the auxiliary power supply +3.3V_AS of +3.3V in the example). The anode of the second enabling diode D162, the second terminal of the third enabling capacitor C161, and the second terminal of the sixth enabling resistor R162 are all grounded.

[0146] The first terminal of the first enabling triode Q161 is connected to a power supply (such as Figure 9 the auxiliary power supply +5V_AS of +5V in the example) through the seventh enabling resistor R163, and the second terminal of the first enabling triode Q161 serves as the output terminal of the first enabling module.

[0147] The following is an embodiment of the charging pile device of the present application. For the details not described in detail, reference can be made to the corresponding embodiment of the magnetic latching relay control circuit above.

[0148] Figure 1 The structure of the charging pile provided by the embodiment of the present application is shown. For the convenience of description, only the parts related to the embodiment of the present application are shown and are described in detail as follows:

[0149] As Figure 1 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 the magnetic latching relay control circuit 1 in each of the above embodiments.

[0150] In this embodiment, the magnetic latching relay control circuit 1 can drive the relays in the magnetic latching relay group 2 to control the closing or opening of the relays, so that the charging pile starts or stops working.

[0151] In some embodiments, as Figure 10 shown, the magnetic latching relay group 2 includes a first relay RLY1; an output terminal of the first converter 3 is connected to the first relay RLY1; the magnetic latching relay control circuit 1 is connected to the first relay RLY1.

[0152] In this embodiment, the magnetic latching relay group 2 may include one relay, that is, the first relay RLY1. Through the magnetic latching relay control circuit 1, the first relay RLY1 can be controlled, so that the first converter 3 starts to output voltage or stops outputting voltage ( Figure 10 V1 in the example represents the first voltage at the first output terminal of the first converter, and V2 represents the second voltage at the second output terminal of the first converter).

[0153] In some embodiments, asFigure 11 As shown, each charging unit further includes a second converter 4; the magnetic latching relay group 2 includes a first relay RLY1; the second output terminal of the first converter 3 is connected to the first output terminal of the second converter 4 through the first relay RLY1; the magnetic latching relay control circuit 1 is connected to the first relay RLY1.

[0154] 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 is controlled by the magnetic latching relay control circuit 1 to achieve the control of the high-voltage gear of the charging pile. Among them, the first output terminal of the first converter corresponds to the first voltage V1, and the second output terminal of the first converter corresponds to the second voltage ( Figure 11 not involved herein), the first output terminal of the second converter corresponds to the third voltage ( Figure 11 not involved herein), and the second output terminal of the second converter corresponds to the fourth voltage V4.

[0155] In some other embodiments, as Figure 12 shown, each charging unit further includes a second converter 4; the magnetic latching relay group 2 includes a second relay RLY2 and a third relay RLY3; the first output terminal of the first converter 3 is connected to the first output terminal of the second converter 4 through the second relay RLY2, and the second output terminal of the first converter 3 is connected to the second output terminal of the second converter 4 through the third relay RLY3.

[0156] In this embodiment, a second converter 4 can also be provided in the charging unit. By the second relay RLY2 and the third relay RLY3, the first converter 3 and the second converter 4 can be connected in parallel, and the second relay RLY2 and the third relay RLY3 are controlled by the magnetic latching relay control circuit 1 to achieve the control of the low-voltage gear of the charging pile.

[0157] Optionally, as Figure 13 shown, both the high-voltage gear and the low-voltage gear can be provided in the charging unit of the charging pile.

[0158] The second output terminal of the first converter 3 is connected to the first output terminal of the second converter 4 through the first relay RLY1. The first output terminal of the first converter 3 is connected to the first output terminal of the second converter 4 through the second relay RLY2, and the second output terminal of the first converter 3 is connected to the second output terminal of the second converter 4 through the third relay RLY3. The magnetic latching relay control circuit 1 is connected to the first relay RLY1, the second relay RLY2, and the third relay RLY3.

[0159] Among them, the first output terminal of the first converter corresponds to the first voltage V1, the second output terminal of the first converter corresponds to the second voltage V2, the first output terminal of the second converter corresponds to the third voltage V3, and the second output terminal of the second converter corresponds to the fourth voltage V4.

[0160] Taking Figure 13 the shown charging pile as an example, when the first enable signal Relay1_EN is at a high level, the second enable signal Relay2_EN is at a high level, the first drive signal Relay_A is at a high level, the second drive signal Relay_B is at a low level, the third drive signal Relay_C is at a high level, and the fourth drive signal Relay_D is at a low level:

[0161] 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 closing signal Relay1_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the first closing unit 111 is not turned on. The second logic module outputs a high-level first opening signal Relay1_Open according to the third drive signal Relay_C, and the first opening unit 112 is turned on. That is, the first enable unit 113 and the first opening unit 112 are turned on, and the first relay RLY1 is opened.

[0162] 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 closing signal Relay2_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, the second closing unit 121 is turned on, the third logic module outputs a low-level second opening signal Relay2_Open according to the fourth drive signal Relay_D, and the second opening unit 122 is not turned on. That is, the second enable unit 123 and the second closing unit 121 are turned on, and the second relay RLY2 and the third relay RLY3 are closed.

[0163] Based on this, the charging pile operates in the low-voltage gear.

[0164] In the above case, if the first drive signal Relay_A changes from high level to low level, the first logic module outputs a low-level first closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. The first closing unit 111 and the second closing unit 121 are not turned on. At this time, the second opening unit 122 is also not turned on. The second relay RLY2 and the third relay RLY3 still remain in the closed state, and the first relay RLY1 still remains in the open state. The relay will not malfunction due to incorrect signal changes.

[0165] If the second drive signal Relay_B changes from low level to high level, the first logic module outputs a low-level first closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. As described above, the first relay RLY1, the second relay RLY2, and the third relay RLY3 still remain in their original states, and the relay will not malfunction due to incorrect signal changes.

[0166] If the third drive signal Relay_C changes from high level to low level, the second logic module outputs a low-level first opening signal Relay1_Open, and the first opening unit 112 is not turned on. At this time, the first closing unit 111 is also not turned on. The first relay RLY1 still remains in the open state, and the relay will not malfunction due to incorrect signal changes. The charging pile can still work normally.

[0167] If the fourth drive signal Relay_D changes from low level to high level, the third logic module outputs a high-level second opening signal Relay2_Open, and the second opening unit 122 is turned on. At this time, the second closing unit 121 and the second opening unit 122 are turned on simultaneously, and the resultant 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 can still remain in the closed state.

[0168] In addition, if the first enable signal Relay1_EN or the second enable signal Relay2_EN changes from high level to low level, the two coils of the corresponding relay will not be energized and can still remain in their original states.

[0169] The above mainly describes the situation of single-point faults, that is, the situation when a single drive signal changes. Next, the situation when two drive signals change will be described.

[0170] 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 closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. At this time, the first closing unit 111 and the first opening unit 112 are turned on, and the second closing unit 121 and the second opening unit 122 are not turned on. That is, the two coils of the first relay RLY1 are energized simultaneously, and the resultant force on the iron core is zero. The first relay RLY1 does not change and can still maintain the open state; the two coils of the second relay RLY2 and the two coils of the third relay RLY3 are not energized. Correspondingly, the second relay RLY2 and the third relay RLY3 do not change and can still maintain the closed state.

[0171] If the first driving signal Relay_A changes from high level to low level, and the third driving signal Relay_C changes from high level to low level, the first logic module outputs a low-level first closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. Correspondingly, the first closing unit 111 and the second closing unit 121 are not turned on; the second logic module outputs a low-level first opening signal Relay1_Open. Correspondingly, the first opening unit 112 is not turned on. At this time, the second opening unit 122 is not turned on. 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.

[0172] 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 closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed; the second logic module outputs a low-level first opening signal Relay1_Open. Similarly, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 will not change.

[0173] 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.

[0174] 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 specific details, please refer to the above single-point fault situation.

[0175] When the first enable signal Relay1_EN is at a high level, the second enable signal Relay2_EN is at a high level, the first drive signal Relay_A is at a low level, the second drive signal Relay_B is at a high level, the third drive signal Relay_C is at a low level, and the fourth drive signal Relay_D is at a high level:

[0176] For the first relay RLY1, since the first enable signal Relay1_EN is at a high level, the first enable unit 113 is turned on. The first logic module outputs a high-level first closing signal Relay1_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the first closing unit 111 is turned on. The second logic module outputs a low-level first opening signal Relay1_Open according to the third drive signal Relay_C, and the first opening unit 112 is not turned on. That is, the first enable unit 113 and the first closing unit 111 are turned on, and the first relay RLY1 is closed.

[0177] For the second relay RLY2 and the third relay RLY3, since the second enable signal Relay2_EN is at a high level, the second enable unit 123 is turned on. The first logic module outputs a low-level second closing signal Relay2_Closed according to the first drive signal Relay_A and the second drive signal Relay_B, and the second closing unit 121 is not turned on. The third logic module outputs a high-level second opening signal Relay2_Open according to the fourth drive signal Relay_D, and the second opening unit 122 is turned on. That is, the second enable unit 123 and the second opening unit 122 are turned on, and the second relay RLY2 and the third relay RLY3 are open.

[0178] Based on this, the charging pile operates in the high-voltage gear.

[0179] In the above case, if the second drive signal Relay_B changes from high level to low level, the first logic module outputs a low-level first closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. The first closing unit 111 and the second closing unit 121 are not turned on. At this time, the first opening unit 112 is also not turned on. The first relay RLY1 still remains in the closed state, and the second relay RLY2 still remains in the open state. The relay will not malfunction due to incorrect signal changes.

[0180] If the first drive signal Relay_A changes from low level to high level, the first logic module outputs a low-level first closing signal Relay1_Closed and a low-level second closing signal Relay2_Closed. As can be seen from the above, the first relay RLY1, the second relay RLY2, and the third relay RLY3 still remain in their original states. The relay will not malfunction due to incorrect signal changes.

[0181] If the fourth drive signal Relay_D changes from high level to low level, the third logic module outputs a low-level second opening signal Relay2_Open. The second opening unit 122 is not turned on. At this time, the second closing unit 121 is also not turned on. The second relay RLY2 and the third relay RLY3 still remain in the open state. The relay will not malfunction due to incorrect signal changes. The charging pile can still work normally.

[0182] If the third drive signal Relay_C changes from low level to high level, the second logic module outputs a high-level first opening signal Relay1_Open. The first opening unit 112 is turned on. At this time, the first closing unit 111 and the first opening unit 112 are turned on simultaneously. The resultant 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 the closed state.

[0183] The above mainly describes the situation of single-point faults, that is, the situation when a single drive signal changes. Next, the situation when two drive signals change simultaneously will be described.

[0184] If the first drive signal Relay_A changes from low level to high level and the second drive signal Relay_B changes from high level to low level, the first logic module outputs a low-level first closing signal Relay1_Closed and a high-level second closing signal Relay2_Closed. The first closing unit 111 and the first opening unit 112 are not turned on. The second closing unit 121 and the second opening unit 122 are turned on. Therefore, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 remain unchanged.

[0185] 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 first closing signal Relay1_Closed of low level and a second closing signal Relay2_Closed of low level, and the third logic module outputs a second opening signal Relay2_Open of low level. Correspondingly, the first closing unit 111, the second closing unit 121, the first opening unit 112, and the second opening unit 122 are all non-conductive. Therefore, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 do not change.

[0186] If the first drive signal Relay_A changes from low level to high level and the fourth drive signal Relay_D changes from high level to low level, the first logic module outputs a first closing signal Relay1_Closed of low level and a second closing signal Relay2_Closed of low level, and the third logic module outputs a second opening signal Relay2_Open of low level. In the same situation as above, the states of the first relay RLY1, the second relay RLY2, and the third relay RLY3 will not change.

[0187] For the case where the first enable signal Relay1_EN or the second enable signal Relay2_EN changes, it can refer to the situation where the charging pile works in the low-voltage gear as described above, and will not be elaborated here.

[0188] In summary, for the closing signal and the opening signal, only when the closing signal and the opening signal corresponding to the relay in the closed state change simultaneously, considering the accurate control of the relay, the magnetic latching relay control circuit will control the relay to perform corresponding actions. When the two signals change in the remaining cases or only one signal changes, the relay can still maintain its original state without change, which can reduce the occurrence of relay misoperation and ensure the normal operation of the charging pile.

[0189] For the enable signal, when the enable signal changes, the coil of the corresponding relay is de-energized, and the relay can still maintain its original state without change, which can reduce the occurrence of relay misoperation and ensure the normal operation of the charging pile.

[0190] In addition, when the first enable signal Relay1_EN is at high level, the second enable signal Relay2_EN is at high level, the first drive signal Relay_A is at low level, the second drive signal Relay_B is at low level, the third drive signal Relay_C is at high level, and the fourth drive signal Relay_D is at high level:

[0191] For the first relay RLY1, when the first enable signal Relay1_EN is at a high level, the first enable unit 113 is turned on. The first logic module outputs a low-level first closing signal Relay1_Closed based on the first drive signal Relay_A and the second drive signal Relay_B, and the first closing unit 111 is not turned on. The second logic module outputs a high-level first opening signal Relay1_Open based on the third drive signal Relay_C, and the first opening unit 112 is turned on. That is, the first enable unit 113 and the first opening unit 112 are turned on, and the first relay RLY1 is opened.

[0192] For the second relay RLY2 and the third relay RLY3, when the second enable signal Relay2_EN is at a high level, the second enable unit 123 is turned on. The first logic module outputs a low-level second closing signal Relay2_Closed based on the first drive signal Relay_A and the second drive signal Relay_B, the second closing unit 121 is not turned on, and the third logic module outputs a high-level second opening signal Relay2_Open based on the fourth drive signal Relay_D, and the second opening unit 122 is turned on. That is, the second enable unit 123 and the second opening unit 122 are turned on, and the second relay RLY2 and the third relay RLY3 are opened.

[0193] At this time, the relays in both the high-voltage gear and the low-voltage gear are opened, and the charging unit of the charging pile does not work.

[0194] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0195] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various 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 and a second driving module; the first driving module includes a first latching unit, a first disconnecting unit, and a first enabling unit; the second driving module includes a second latching unit, a second disconnecting unit, and a second 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, and 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 one 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 is connected between the second output terminal of the first converter and the second output terminal of the second converter; The first enabling unit is connected to the first coil through the first latching unit, and the first enabling unit is connected to the second coil through the first disconnecting unit; The input terminal of the first enabling unit is used for inputting a first enabling signal, the input terminal of the first latching unit is used for inputting a first latching signal, and the input terminal of the first disconnecting unit is used for inputting a first disconnecting signal; When the first enabling signal and the first latching signal are high-level signals, the first enabling unit, the first latching unit, and the first coil are connected, and the first relay is controlled to close; 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 disconnect; The second enabling unit is connected to the third coil through the second latching unit, and the second enabling unit is connected to the fourth coil through the second disconnecting unit; The input terminal of the second enabling unit is used for inputting a second enabling signal, the input terminal of the second latching unit is used for inputting a second latching signal, and the input terminal of the second disconnecting unit is used for inputting a second disconnecting signal; When the second enabling signal and the second latching signal are high-level signals, the second enabling unit, the second latching unit, and the third coil are connected, and the second relay is controlled to close; 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, and the second relay is controlled to disconnect; Wherein, the first latching signal and the second latching signal are not high-level signals simultaneously.

2. The magnetic latching relay control circuit according to claim 1, wherein 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 terminal of the first AND gate receives the first driving signal through the first NOT gate; the second input terminal of the first AND gate is for receiving the second driving signal; the output terminal of the first AND gate is connected to the input terminal of the first latching unit; the first AND gate generates the first latching signal and inputs it to the first latching unit; The first input terminal of the second AND gate receives the second driving signal through the second NOT gate; the second input terminal of the second AND gate is for receiving the first driving signal; the output terminal of the second AND gate is connected to the input terminal of the second latching unit; the second AND gate generates the second latching signal and inputs it to the second latching unit.

3. The magnetic latching relay control circuit according to claim 1, 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 through the first latching unit, and the first enabling unit is connected to the sixth coil through the first disconnecting unit; Alternatively, the third relay is connected in parallel with the second relay; the second enabling unit is connected to the fifth coil through the second latching unit, and the second enabling unit is connected to the sixth coil through the second disconnecting unit.

4. The magnetic latching relay control circuit according to any one of claims 1 to 3, characterized in that, The first latching unit includes a first triode, the first disconnecting unit includes a second triode, and the first enabling unit includes a third triode; The first end of the third triode is respectively connected to the second end of the first triode and the second end of the second triode; the second end of the third triode is for grounding; the first end of the first triode is for connecting to the first coil, and the first end of the second triode is for connecting to the second coil; The third end of the first triode is for receiving the first latching signal, the third end of the second triode is for receiving the first disconnecting signal, and the third end of the third triode is for receiving the first enabling signal.

5. The magnetic latching relay control circuit according to any one of claims 1 to 3, characterized in that, The second latching unit includes a fourth triode, the second disconnecting unit includes a fifth triode, and the second enabling unit includes a sixth triode; The first end of the sixth triode is respectively connected to the second end of the fourth triode and the second end of the fifth triode; the second end of the sixth triode is for grounding; the first end of the fourth triode is for connecting to the first coil, and the first end of the fifth triode is for connecting to the second coil; The third end of the fourth triode is for receiving the second latching signal, the third end of the fifth triode is for receiving the second disconnecting signal, and the third end of the sixth triode is for receiving the second enabling signal.

6. A charging pile, characterized in that, including at least one charging unit; Each charging unit includes a first converter, a second converter, a magnetic latching relay group, and the magnetic latching relay control circuit according to any one of claims 1 to 5 above; The magnetic latching relay group includes a first relay and a second relay; 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 relay 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 is connected between the second output terminal of the first converter and the second output terminal of the second converter; The magnetic latching relay control circuit is connected to the first relay and the second relay.

7. The charging pile according to claim 6, characterized in that, The magnetic latching relay group further includes a third relay; When the second output terminal of the first converter is connected to the first output terminal of the second converter through the first relay, the first output terminal of the first converter is connected to the first output terminal of the second converter through the second relay, and the second output terminal of the first converter is connected to the second output terminal of the second converter through the third relay; The magnetic latching relay control circuit is connected to the third relay.

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