Driving circuit and power supply

Abstract

The utility model discloses a drive circuit and a power supply, the drive circuit comprises an input unit and a positive and negative level switching unit, the input unit inputs a power supply signal, and the positive and negative level switching unit outputs a positive pulse signal for controlling the actuation of a magnetic latching contactor through the power supply signal input by the input unit. Or the input unit inputs a power supply signal and a power-off signal, and the positive and negative level switching unit outputs a negative pulse signal for controlling the magnetic latching contactor to be switched off through the power supply signal and the power-off signal input by the input unit. According to the driving circuit provided by the embodiment of the utility model, the positive and negative pulse signals for controlling the magnetic latching contactor can be output through the input unit and the positive and negative level switching unit, and a hardware circuit is simple and does not need to be matched with software, so that the complexity of the driving circuit can be reduced, and the performance of the driving circuit can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially relates to a drive circuit and power supply. BACKGROUND

[0002] With the development of power supply products gradually to miniaturization, intelligent, more energy-saving direction, so that the future magnetic latching contactor will be more common use. Magnetic latching contactor compared to conventional contactor has small size, low energy consumption, long electrical life, power failure can be kept, contact pressure drop and other advantages. With magnetic latching contactor power supply products compared to conventional contactor with power supply products, will be more space saving, whole machine efficiency and reliability will be greatly improved.

[0003] In related art, the hardware circuit design of the drive circuit of the magnetic latching contactor is relatively complex, and the control can be realized only by upgrading the software. UTILITY MODEL CONTENTS

[0004] The utility model provides a drive circuit and power supply to solve the existing magnetic latching contactor drive circuit hardware circuit design is relatively complex, and the control can be realized only by upgrading the software problem in the prior art.

[0005] In a first aspect, the utility model provides a drive circuit applied to a magnetic latching contactor, comprising: an input unit and a positive and negative level switching unit;

[0006] The input unit is electrically connected with a power supply unit, a control unit and the positive and negative level switching unit, and the positive and negative level switching unit is also electrically connected with the magnetic latching contactor;

[0007] The input unit is used for inputting a power supply signal or inputting the power supply signal and a power-down signal, wherein the power supply signal is output by the power supply unit, and the power-down signal is output by the control unit;

[0008] The positive and negative level switching unit is used for outputting a positive pulse signal for controlling the magnetic latching contactor to attract in the case of inputting the power supply signal through the input unit, or outputting a negative pulse signal for controlling the magnetic latching contactor to disconnect in the case of inputting the power supply signal and the power-down signal through the input unit.

[0009] In a possible implementation manner, the input unit comprises a power supply signal input end, a power-down signal input end and an anti-backflow module;

[0010] The power supply signal input end is electrically connected with the power supply unit and the anti-backflow module and is used for inputting the power supply signal;

[0011] The power-off signal input terminal is electrically connected to the control unit and the anti-backflow module, and is used to input the power-off signal;

[0012] The anti-backflow module is used to prevent current backflow.

[0013] In a possible implementation, the power signal input terminal includes a power positive electrode interface and a power negative electrode interface, wherein the power negative electrode interface includes a battery negative electrode interface and a DC power negative electrode interface;

[0014] The positive power supply interface is electrically connected to the anti-backflow module; the negative power supply interface is electrically connected to the anti-backflow module;

[0015] The power positive electrode interface and the DC power negative electrode interface are used to receive the first power signal output by the power supply unit;

[0016] The power positive electrode interface and the battery negative electrode interface are used to receive the second power signal output by the power supply unit.

[0017] In a possible implementation, the power-off signal input terminal includes an active positive interface, an active negative interface, a passive positive interface, a passive negative interface, and a toggle switch;

[0018] The active positive interface is electrically connected to the anti-backflow module, the active negative interface is electrically connected to the third end of the toggle switch, the passive negative interface is electrically connected to the anti-backflow module, the passive positive interface is electrically connected to the first end of the toggle switch, and the second end of the toggle switch is electrically connected to the positive and negative level switching unit;

[0019] The active positive interface and the active negative interface are used to receive a first power-off signal sent by the control unit, where the first power-off signal is an active signal;

[0020] The passive positive interface and the passive negative interface are used to receive a second power-off signal sent by the control unit, where the second power-off signal is a passive signal.

[0021] In a possible implementation, the backflow prevention module includes a first diode, a second diode, a third diode, and a fourth diode;

[0022] The anode of the first diode is electrically connected to the anode of the second diode and the passive negative interface, and the cathode of the first diode is electrically connected to the negative interface of the DC power supply;

[0023] The cathode of the second diode is electrically connected to the negative port of the battery;

[0024] The anode of the third diode is electrically connected to the positive power supply interface and the positive-negative level switching unit, and the cathode of the third diode is electrically connected to the cathode of the fourth diode and the positive-negative level switching unit;

[0025] An anode of the fourth diode is electrically connected to the active positive interface.

[0026] In a possible implementation, the positive-negative level switching unit includes a relay, a fifth diode, a sixth diode, and an auxiliary contact of the magnetic latching contactor;

[0027] The first normally open contact of the relay is electrically connected to the positive electrode interface of the power supply, the anode of the third diode and the second normally closed contact of the relay, the first normally closed contact of the relay is electrically connected to the anode of the first diode, the anode of the second diode, the passive negative interface and the first normally open contact of the relay, the first common end of the relay serves as the first output end of the drive circuit, the second common end of the relay is electrically connected to the anode of the fifth diode and the cathode of the sixth diode, the first end of the coil of the relay is electrically connected to the cathode of the third diode and the cathode of the fourth diode, and the second end of the coil of the relay is electrically connected to the second end of the toggle switch;

[0028] The cathode of the fifth diode is electrically connected to the first normally closed contact of the auxiliary contact of the magnetic holding contactor;

[0029] The anode of the sixth diode is electrically connected to the first normally open contact of the auxiliary contact of the magnetic holding contactor;

[0030] The second normally closed contact of the magnetic holding contactor is electrically connected to the second normally open contact of the magnetic holding contactor and serves as a second output end of the drive circuit.

[0031] In a possible implementation, a lightning protection unit is also included:

[0032] The lightning protection unit is connected to the input unit and the positive and negative level switching unit respectively;

[0033] The lightning protection unit is used to reduce the residual voltage caused by lightning in the driving circuit.

[0034] In a possible implementation, the lightning protection unit includes a first resistor, a first inductor, a second inductor, and a first bidirectional transient voltage suppression diode;

[0035] A first end of the first resistor is electrically connected to the positive power supply interface and the first end of the first inductor, and a second end of the first resistor is electrically connected to the anode of the first diode, the anode of the second diode, and the first end of the second inductor;

[0036] a second end of the first inductor is electrically connected with a first end of the first bidirectional transient voltage suppression diode, an anode of the third diode and a first normally open contact of the relay;

[0037] a second end of the second inductor is electrically connected with a second end of the first bidirectional transient voltage suppression diode, the passive negative interface, a first normally closed contact of the relay and a second normally open contact of the first relay.

[0038] In a possible implementation, the circuit further comprises a suppression unit;

[0039] the suppression unit is electrically connected with the positive-negative level switching unit;

[0040] the suppression unit is configured to absorb electric energy after the magnetic latching contactor is powered off, and to discharge a reverse overvoltage electromotive force in an instant when a coil of the magnetic latching contactor is powered off or powered on.

[0041] In a possible implementation, the suppression unit comprises a second resistor, a third resistor, a first capacitor, a second capacitor and a second bidirectional transient voltage suppression diode;

[0042] a first end of the second bidirectional transient voltage suppression diode is electrically connected with a first end of the second resistor, a first end of the third resistor and a first common terminal of the relay, and serves as a first output terminal of the driving circuit, and a second end of the second bidirectional transient voltage suppression diode is electrically connected with a second end of the first capacitor, a second end of the second capacitor and a second normally open contact of the magnetic latching contactor, and serves as a second output terminal of the driving circuit;

[0043] a second end of the second resistor is electrically connected with a first end of the first capacitor, a second end of the third resistor and a first end of the second capacitor.

[0044] In a second aspect, the utility model also provides a power supply, including AC input unit, rectifier unit, magnetic latching contactor, direct current distribution unit, control unit and as the driving circuit of any one of the first aspect;

[0045] the AC input unit, the rectifier unit, the magnetic latching contactor and the direct current distribution unit are electrically connected in sequence;

[0046] the control unit is configured to output a power-off signal to the driving circuit;

[0047] the driving circuit is configured to output a positive pulse signal for controlling the magnetic latching contactor to attract, or output a negative pulse signal for controlling the magnetic latching contactor to disconnect.

[0048] The utility model has the advantages of:

[0049] The drive circuit and power supply provided by the embodiment of the present invention include an input unit and a positive-negative level switching unit. The input unit inputs a power signal, and the positive-negative level switching unit outputs a positive pulse signal for controlling the magnetic holding contactor to engage based on the power signal input by the input unit. Alternatively, the input unit inputs a power signal and a power-off signal, and the positive-negative level switching unit outputs a negative pulse signal for controlling the magnetic holding contactor to disengage based on the power signal and the power-off signal input by the input unit. Because the drive circuit in the embodiment of the present invention can output positive and negative pulse signals for controlling the magnetic holding contactor through the input unit and the positive-negative level switching unit, the hardware circuit is simple and does not require software implementation, thereby reducing the complexity of the drive circuit and improving the performance of the drive circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0051] Figure 1 A schematic structural diagram of a driving circuit provided in an embodiment of the present utility model;

[0052] Figure 2 A circuit diagram of a driving circuit provided by an embodiment of the present utility model;

[0053] Figure 3 A circuit diagram of another driving circuit provided by an embodiment of the present utility model;

[0054] Figure 4 A circuit diagram of another driving circuit provided by an embodiment of the present utility model;

[0055] Figure 5 A circuit diagram of another driving circuit provided by an embodiment of the present utility model;

[0056] Figure 6 A schematic diagram of the structure of a power supply provided by an embodiment of the present utility model;

[0057] Figure 7 A circuit diagram of another driving circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0059] Currently, power supply products on the market are typically equipped with conventional contactors. The main reasons are: first, most monitoring output interfaces of power supply manufacturers can only output level signals, not positive or negative pulse signals, and therefore can only drive conventional monostable contactors; second, the current mainstream driving circuits for magnetic latching contactors use dual relay solutions or single relay + MOS tube solutions. These two solutions must occupy two active channels of the monitoring device (control unit) to achieve one magnetic latching contactor control. The hardware circuit design is relatively complex, the channels are occupied, and upgraded software is required to achieve control. These factors have hindered the widespread application of magnetic latching contactors.

[0060] This embodiment of the utility model comprehensively considers the advantages and disadvantages of current mainstream drive circuits and adopts a single-relay solution to provide a drive circuit for a magnetic latching contactor with simple hardware circuitry, minimal monitoring channel usage, strong compatibility, and no software coordination required. The drive circuit provided by this embodiment of the utility model not only reduces the utilization of monitoring hardware resources but also is suitable for magnetic latching contactors with different drive pulse widths. It also broadens the application scenarios that only support conventional contactor monitoring, thereby further promoting the application and development of magnetic latching contactors in the power supply and industrial control industries.

[0061] A driving circuit and a power supply provided by an embodiment of the present utility model are described in detail below with reference to the accompanying drawings.

[0062] like Figure 1 , which is a structural diagram of a driving circuit provided by an embodiment of the present utility model, and is applied to a magnetic latching contactor, comprising: an input unit 11 and a positive and negative level switching unit 12;

[0063] The input unit 11 is electrically connected to the power supply unit, the control unit and the positive and negative level switching unit 12, and the positive and negative level switching unit 12 is electrically connected to the magnetic latching contactor;

[0064] An input unit 11, for inputting a power signal, or for inputting a power signal and a power-off signal, wherein the power signal is output by the power unit and the power-off signal is output by the control unit;

[0065] The positive and negative level switching unit 12 is used to output a positive pulse signal for controlling the magnetic holding contactor to be attracted when a power signal is input through the input unit 11, or to output a negative pulse signal for controlling the magnetic holding contactor to be disconnected when a power signal and a power-off signal are input through the input unit 11.

[0066] In the drive circuit provided by the embodiment of the present invention, an input unit inputs a power signal, and a positive-negative level switching unit outputs a positive pulse signal for controlling the magnetic latching contactor to engage based on the power signal input by the input unit, or an input unit inputs a power signal and a power-off signal, and the positive-negative level switching unit outputs a negative pulse signal for controlling the magnetic latching contactor to disengage based on the power signal and the power-off signal input by the input unit. Because the drive circuit in the embodiment of the present invention can output positive and negative pulse signals for controlling the magnetic latching contactor through the input unit and the positive-negative level switching unit, the hardware circuit is simple and does not require software implementation, thereby reducing the complexity of the drive circuit and improving the performance of the drive circuit.

[0067] In specific implementation, Figure 2 As shown, the input unit 11 includes a power signal input terminal 111, a power-off signal input terminal 112 and an anti-backflow module 113;

[0068] The power signal input terminal 111 is electrically connected to the power supply unit and the backflow prevention module 113 and is used to input a power signal;

[0069] The power-off signal input terminal 112 is electrically connected to the control unit and the backflow prevention module 113 and is used to input a power-off signal;

[0070] The backflow prevention module 113 is used to prevent current backflow.

[0071] In one embodiment, if Figure 2 As shown, the power signal input terminal 111 includes a power positive electrode interface POWER+ and a power negative electrode interface (POWER- and PS_BAT-), wherein the power negative electrode interface includes a battery negative electrode interface PS_BAT- and a DC power negative electrode interface POWER-;

[0072] The positive power interface POWER+ is electrically connected to the anti-backflow module 113; the negative power interface (POWER- and PS_BAT-) is electrically connected to the anti-backflow module 113;

[0073] The power positive electrode interface POWER+ and the DC power negative electrode interface POWER- are used to receive the first power signal output by the power supply unit;

[0074] The power positive terminal interface POWER+ and the battery negative terminal interface PS_BAT- are used to receive the second power signal output by the power supply unit.

[0075] In an embodiment of the present invention, the power supply unit can be a DC power supply of 20 to 60 VDC, and the driving circuit supports dual power supply access, wherein the first power supply signal can be a power supply signal output by the DC output end, and the second power supply signal can be a power supply signal output by the battery. If the DC power supply is a single output, only one power supply can be connected.

[0076] The dual power supply access in the novel embodiment can improve the reliability of the driving circuit.

[0077] In specific implementation, Figure 2 As shown, the power-down signal input terminal 112 includes an active positive interface SDI+, an active negative interface SDI-, a passive positive interface DI+, a passive negative interface DI- and a toggle switch ST;

[0078] The active positive interface SDI+ is electrically connected to the anti-backflow module 113, the active negative interface SDI- is electrically connected to the third end of the toggle switch ST, the passive negative interface DI- is electrically connected to the anti-backflow module 113, the passive positive interface DI+ is electrically connected to the first end of the toggle switch ST, and the second end of the toggle switch ST is electrically connected to the positive and negative level switching unit 12;

[0079] Active positive interface SDI+ and active negative interface SDI-, used to receive the first power-off signal sent by the control unit. The first power-off signal is an active signal.

[0080] The passive positive interface DI+ and the passive negative interface DI- are used to receive a second power-off signal sent by the control unit, where the second power-off signal is a passive signal.

[0081] In the embodiment of the present utility model, the active positive interface SDI+ and the active negative interface SDI- are 20~60VDC level signal control input interfaces, that is, the input power-on signal is an active signal; the passive positive interface DI+ and the passive negative interface DI- are dry contact control input interfaces, that is, the input power-on signal is a passive signal.

[0082] The input of active signal and passive signal can be switched by toggle switch ST, refer to Figure 2 When the input power-on signal is an active signal, the second end of the toggle switch ST and the third end of the toggle switch ST are adjusted to be connected; when the input power-on signal is a passive signal, the first end of the toggle switch ST and the second end of the toggle switch ST are adjusted to be connected.

[0083] Specifically, the switching between active signals and passive signals (dry node signals) can be achieved by adjusting the position of the toggle switch ST. For example, when the control unit supports active signal output, the second end of the toggle switch ST and the third end of the toggle switch ST can be adjusted to be connected; when the control unit supports passive signal output, the first end of the toggle switch ST and the second end of the toggle switch ST can be adjusted to be connected.

[0084] In specific implementation, Figure 2 As shown, the backflow prevention module 113 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4;

[0085] The anode of the first diode D1 is electrically connected to the anode of the second diode D2 and the passive negative interface DI-, and the cathode of the first diode D1 is electrically connected to the DC power supply negative interface POWER-;

[0086] The cathode of the second diode D2 is electrically connected to the negative terminal PS_BAT- of the battery;

[0087] The anode of the third diode D3 is electrically connected to the power positive electrode interface POWER+ and the positive-negative level switching unit 112, and the cathode of the third diode D3 is electrically connected to the cathode of the fourth diode D4 and the positive-negative level switching unit 112;

[0088] An anode of the fourth diode D4 is electrically connected to the active positive interface SDI+.

[0089] In the embodiment of the present utility model, the first diode D1 and the second diode D2 can prevent the positive and negative connections of the power supply from being reversed, and can also prevent the voltage difference between the DC power supply negative interface POWER- and the battery negative interface PS_BAT- from forming a loop current. The third diode D3 can prevent current from flowing from the active positive interface LVD1+ into the power supply positive interface 0V, and the fourth diode D4 can prevent current from flowing from the power supply positive interface 0V into the active positive interface LVD1+.

[0090] In a specific implementation, the positive and negative level switching unit 112 includes a relay KA, a fifth diode D5, a sixth diode D6 and auxiliary contacts (KM-NC, KM-NO) of a magnetic latching contactor KM;

[0091] The first normally open contact of relay KA is electrically connected to the positive power supply interface POWER+, the anode of the third diode D3, and the second normally closed contact of relay KA. The first normally closed contact of relay KA is electrically connected to the anode of the first diode D1, the anode of the second diode D2, the passive negative interface DI-, and the first normally open contact of relay KA. The first common terminal of relay KA serves as the first output terminal of the drive circuit. The second common terminal of relay KA is electrically connected to the anode of the fifth diode D5 and the cathode of the sixth diode D6. The first end of the coil of relay KA is electrically connected to the cathode of the third diode D3 and the cathode of the fourth diode D4. The second end of the coil of relay KA is electrically connected to the second end of the toggle switch ST.

[0092] The cathode of the fifth diode D5 is electrically connected to the normally closed contact KM-NC of the auxiliary contact of the magnetic latching contactor;

[0093] The anode of the sixth diode D6 is electrically connected to the normally open contact KM-NO of the auxiliary contact of the magnetic latching contactor;

[0094] The common terminal KM-NCOM of the auxiliary contacts of the magnetic holding contactor serves as the second output terminal of the drive circuit.

[0095] In the embodiment of the utility model, the relay KA is controlled to be attracted or disconnected through the active interface (SDI+ and SDI-) or the passive interface (DI+ and DI-) to realize the positive and negative switching of the electric level; the positive and negative electric levels are cut off through the normally open and normally closed auxiliary contacts (KM-NC, KM-NO) of the magnetic holding contactor.

[0096] In an embodiment of the present utility model, the first output end of the drive circuit is electrically connected to the first end KM-A2 of the coil of the magnetic holding contactor, and the second output end of the drive circuit is electrically connected to the second end KM-A1 of the coil of the magnetic holding contactor. When the drive circuit outputs a positive pulse signal, the coil of the magnetic holding contactor is energized and the magnetic holding contactor is attracted. When the drive circuit outputs a negative pulse signal, the coil of the magnetic holding contactor loses power and the magnetic holding contactor is disconnected.

[0097] In one embodiment, if Figure 3 As shown, the driving circuit further includes a lightning protection unit 13:

[0098] The lightning protection unit 13 is electrically connected to the input unit 11 and the positive and negative level switching unit 12 respectively;

[0099] The lightning protection unit 13 is used to reduce the residual voltage caused by lightning in the driving circuit.

[0100] In specific implementation, Figure 3 As shown, the lightning protection unit 13 includes a first resistor R1, a first inductor L1, a second inductor L2 and a first bidirectional transient voltage suppression diode TVS1;

[0101] A first end of the first resistor R1 is electrically connected to the positive power supply interface POWER+ and a first end of the first inductor L1, and a second end of the first resistor R1 is electrically connected to the anode of the first diode D1, the anode of the second diode D2, and the first end of the second inductor L2;

[0102] The second end of the first inductor L1 is electrically connected to the first end of the first bidirectional transient voltage suppressor diode TVS1, the anode of the third diode D3 and the first normally open contact of the relay KA;

[0103] The second end of the second inductor L2 is electrically connected to the second end of the first bidirectional transient voltage suppressor diode TVS1 , the passive negative interface DI−, the first normally closed contact of the relay KA, and the second normally open contact of the relay KA.

[0104] In the embodiment of the present invention, the first resistor R1 may be a varistor, and the lightning protection unit 13 cooperates with the surge protector SPD in the DC power supply system to reduce the residual voltage caused by lightning strikes in the drive circuit and protect circuit components.

[0105] In one embodiment, if Figure 4 As shown, the driving circuit further includes a suppression unit 14;

[0106] The suppression unit 14 is electrically connected to the positive and negative level switching unit 12;

[0107] The suppression unit 14 is used to absorb the electric energy after the magnetic latching contactor is powered off, and to discharge the reverse overvoltage electromotive force at the moment when the coil of the magnetic latching contactor is powered off and powered on.

[0108] In specific implementation, Figure 4 As shown, the suppression unit 12 includes a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2 and a second bidirectional transient voltage suppression diode TVS2;

[0109] A first end of the second bidirectional transient voltage suppressor diode TVS2 is electrically connected to the first end of the second resistor R2, the first end of the third resistor R3, and the first common end of the relay KA, and serves as a first output end of the drive circuit. A second end of the second bidirectional transient voltage suppressor diode TVS2 is electrically connected to the second end of the first capacitor C1, the second end of the second capacitor C2, and the second normally open contact of the magnetic latching contactor KM, and serves as a second output end of the drive circuit.

[0110] The second end of the second resistor R2 is electrically connected to the first end of the first capacitor C1 , the second end of the third resistor R3 , and the first end of the second capacitor C2 .

[0111] In this embodiment of the utility model, a power-off energy absorption circuit for the coil of the magnetic latching contactor is formed by a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2, thereby extending the service life of the magnetic latching contactor. A second bidirectional transient voltage diode TVS2 discharges the reverse overvoltage electromotive force generated at the moment of powering off and on the coil of the magnetic latching contactor, thereby preventing overvoltage damage to components.

[0112] Reference Figure 4 The drive circuit shown, after connecting to the DC power supply and the auxiliary contacts of the magnetic holding contactor, the external control signal (power-on signal) is input through the active interface (SDI+ and SDI-) or the passive interface (DI+ and DI-), and the drive circuit outputs positive and negative drive pulse signals. It can not only realize the output of positive and negative pulse signals with single-channel input, reducing the occupation of monitoring hardware resources, but also does not require improvement of the monitoring control algorithm. In addition, the drive circuit can adaptively output drive signals of different pulse widths for magnetic holding contactors of different specifications and brands; the active interface (SDI+ and SDI-) and the passive interface (DI+ and DI-) can be compatible with active signals and passive signals, thereby improving the application scenarios and usage scope of the drive circuit.

[0113] like Figure 5 As shown, the driving circuit provided in the embodiment of the present application may further include a fuse F, which plays a protective role.

[0114] Reference Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The drive circuit disclosed in the embodiment of the present application may further include a first terminal J1, a second terminal J2 and a third terminal J3. The first terminal J1 is connected to the external power supply and the control unit for inputting power signals and power-off signals. The second terminal J2 is connected to the auxiliary contact of the magnetic holding contactor. The third terminal J3 is connected to the coil of the magnetic holding contactor.

[0115] Based on the same concept, the present application also provides a power supply. The principle of solving the technical problem by the power supply is similar to the principle of solving the technical problem by the above-mentioned driving circuit. The implementation of the power supply can refer to the implementation of the driving circuit, and the repeated parts will not be repeated.

[0116] like Figure 6 , which is a schematic diagram of the structure of a power supply provided by an embodiment of the present utility model, the power supply includes an AC input unit 51, a rectifier unit 52, a magnetic latching contactor 53, a DC power distribution unit 54, a control unit 55 and a drive circuit 56 as described above;

[0117] The AC input unit 51, the rectifier unit 52, the magnetic latching contactor 53 and the DC power distribution unit 54 are electrically connected in sequence;

[0118] The control unit 55 is configured to output a power-off signal to the driving circuit 56;

[0119] The driving circuit 56 is used to output a positive pulse signal to control the magnetic latching contactor 53 to be attracted, or output a negative pulse signal to control the magnetic latching contactor 53 to be disconnected.

[0120] In an embodiment of the present invention, the power supply can be a -48VDC / 450A embedded communication power supply product, the AC input unit 51 in the power supply is a three-phase AC input unit, the rectifier unit 52 is a 75A rectifier unit, and the control unit 55 is also a monitor. Its external control interface can be an active interface or a passive interface. If it is an active interface, the control interface of the control unit 55 is connected to the active positive interface SDI+ and the active negative interface SDI- of the drive circuit. If it is a passive interface, the control interface of the control unit 55 is connected to the passive positive interface DI+ and the passive negative interface DI- of the drive circuit.

[0121] In the embodiment of the present invention, the power-off signal output by the control unit 55 controls the disconnection of the magnetic latching contactor, thereby realizing power-off protection of the load and the battery.

[0122] Specifically, refer to Figure 6 and Figure 7 When the power-off instruction issued by the control unit 55 is an active signal, the second and third ends of the toggle switch ST are adjusted to be conductive, and the power-off instruction is input into the drive circuit through the active interface (SDI+ and SDI-). After the circuit receives the power-off instruction, the coil of the relay KA is energized, and the contacts of the relay KA are activated. The driving current flows from the positive electrode interface POWER+ of the power supply through the first normally open contact and the first common end of the relay KA, and flows from the first end KM-A2 of the coil of the magnetic holding contactor KM to the coil of the magnetic holding contactor KM, and then flows into the second end KM-A1 of the coil of the magnetic holding contactor KM, and then passes through the normally open contact KM-NO of the auxiliary contact of the magnetic holding contactor KM, the sixth diode D6, the second common end and the second normally open contact of the relay KA, and the second diode D2, and flows into the positive electrode interface POWER- of the power supply. The coil of the magnetic holding contactor KM disconnects the main contact under the reverse driving current, and the auxiliary contact of the magnetic holding contactor KM is actuated (the normally open contact of the auxiliary contact changes from closed to open) to cut off the current of the driving circuit, thereby causing the driving circuit to output a negative pulse signal;

[0123] Reference Figure 5 and Figure 6When control unit 55 issues a power-on command (i.e., if control unit 55 does not issue a power-off command), the coil of relay KA loses power, the contacts of relay KA reset, and the drive voltage output by the drive circuit resets. At this point, the drive current flows from the positive power supply interface POWER+ through relay KA's second normally closed contact and second common terminal, fifth diode D5, and the normally closed contact KM-NC of magnetic latching contactor KM. It then flows from KM-A1 of the coil of magnetic latching contactor KM to the coil of magnetic latching contactor KM, then flows into KM-A2, and then flows through relay KA's second normally closed contact to the negative power supply interface POWER-. The positive drive current closes the coil of magnetic latching contactor KM's main contacts. Once the contactor's auxiliary contacts operate (KM-NC switches from closed to open), the drive circuit current is cut off, causing the drive circuit to output a negative pulse.

[0124] Reference Figure 6 and Figure 7 When the control unit 55 does not issue a command, after the system is powered on, if the magnetic latching contactor KM is in the closed state, the drive circuit will not issue a drive pulse. If the magnetic latching contactor KM is in the open state, the drive circuit will issue a positive pulse to the coil of the magnetic latching contactor KM, closing the magnetic latching contactor KM. This achieves the function of correcting the initial state of the magnetic latching contactor KM after power-on.

[0125] In one embodiment, the power supply provided by the embodiment of the present invention has a dynamic environment control system whose energy management function includes system operation mode judgment, power scheduling and equipment operation status control. When the system is running, the dynamic environment control system receives in real time the following data for system scheduling: battery power SOC detected by the BMS, AC and DC bus voltages, load power, and the operating status of each AC / DC and DC / DC module, and cuts off the power supply through the power-off relay when there is an abnormality on the load side.

[0126] The drive circuit and power supply for a magnetic latching contactor provided in this utility model can convert input level signals into positive and negative pulse signals for output. This makes it widely applicable in power supply monitoring, industrial PLCs, DCSs, and other control systems that can only output level signals. This drive circuit not only supports initial state correction for the magnetic latching contactor upon power-up, effectively avoiding control disruptions caused by contactor state changes after transport vibrations, but also utilizes an innovative single-relay solution to effectively reduce the number of control channels occupied, simplify control program design, and lower hardware and software development costs, resulting in an excellent product price-performance ratio.

[0127] Those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A driving circuit, characterized in that: Applied to magnetic latching contactor, including: input unit and positive and negative level switching unit; The input unit is electrically connected to the power supply unit, the control unit and the positive and negative level switching unit, and the positive and negative level switching unit is also electrically connected to the magnetic latching contactor; The input unit is used to input a power signal, or to input the power signal and a power-off signal, wherein the power signal is output by the power unit and the power-off signal is output by the control unit; The positive and negative level switching unit is used to output a positive pulse signal for controlling the magnetic holding contactor to be attracted when the power supply signal is input through the input unit, or to output a negative pulse signal for controlling the magnetic holding contactor to be disconnected when the power supply signal and the power-off signal are input through the input unit.

2. The driving circuit according to claim 1, wherein: The input unit includes a power signal input terminal, a power-off signal input terminal and an anti-backflow module; The power signal input terminal is electrically connected to the power supply unit and the anti-backflow module, and is used to input the power signal; The power-off signal input terminal is electrically connected to the control unit and the anti-backflow module, and is used to input the power-off signal; The anti-backflow module is used to prevent current backflow.

3. The driving circuit according to claim 2, wherein: The power signal input terminal includes a power positive electrode interface and a power negative electrode interface, wherein the power negative electrode interface includes a battery negative electrode interface and a DC power negative electrode interface; The positive power supply interface is electrically connected to the anti-backflow module; the negative power supply interface is electrically connected to the anti-backflow module; The power positive electrode interface and the DC power negative electrode interface are used to receive the first power signal output by the power supply unit; The power positive electrode interface and the battery negative electrode interface are used to receive the second power signal output by the power supply unit.

4. The driving circuit according to claim 3, wherein: The power-off signal input terminal includes an active positive interface, an active negative interface, a passive positive interface, a passive negative interface and a toggle switch; The active positive interface is electrically connected to the anti-backflow module, the active negative interface is electrically connected to the third end of the toggle switch, the passive negative interface is electrically connected to the anti-backflow module, the passive positive interface is electrically connected to the first end of the toggle switch, and the second end of the toggle switch is electrically connected to the positive and negative level switching unit; The active positive interface and the active negative interface are used to receive a first power-off signal sent by the control unit, where the first power-off signal is an active signal; The passive positive interface and the passive negative interface are used to receive a second power-off signal sent by the control unit, where the second power-off signal is a passive signal.

5. The driving circuit according to claim 4, wherein: The anti-backflow module includes a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is electrically connected to the anode of the second diode and the passive negative interface, and the cathode of the first diode is electrically connected to the negative interface of the DC power supply; The cathode of the second diode is electrically connected to the negative port of the battery; The anode of the third diode is electrically connected to the positive power supply interface and the positive-negative level switching unit, and the cathode of the third diode is electrically connected to the cathode of the fourth diode and the positive-negative level switching unit; An anode of the fourth diode is electrically connected to the active positive interface.

6. The driving circuit according to claim 5, wherein: The positive and negative level switching unit includes a relay, a fifth diode, a sixth diode and an auxiliary contact of the magnetic holding contactor; The first normally open contact of the relay is electrically connected to the positive electrode interface of the power supply, the anode of the third diode and the second normally closed contact of the relay, the first normally closed contact of the relay is electrically connected to the anode of the first diode, the anode of the second diode, the passive negative interface and the first normally open contact of the relay, the first common end of the relay serves as the first output end of the drive circuit, the second common end of the relay is electrically connected to the anode of the fifth diode and the cathode of the sixth diode, the first end of the coil of the relay is electrically connected to the cathode of the third diode and the cathode of the fourth diode, and the second end of the coil of the relay is electrically connected to the second end of the toggle switch; The cathode of the fifth diode is electrically connected to the first normally closed contact of the auxiliary contact of the magnetic holding contactor; The anode of the sixth diode is electrically connected to the first normally open contact of the auxiliary contact of the magnetic holding contactor; The second normally closed contact of the magnetic holding contactor is electrically connected to the second normally open contact of the magnetic holding contactor and serves as a second output end of the drive circuit.

7. The driving circuit according to claim 6, wherein: Also includes lightning protection unit: The lightning protection unit is connected to the input unit and the positive and negative level switching unit respectively; The lightning protection unit is used to reduce the residual voltage caused by lightning in the driving circuit.

8. The driving circuit according to claim 7, wherein: The lightning protection unit includes a first resistor, a first inductor, a second inductor and a first bidirectional transient voltage suppression diode; A first end of the first resistor is electrically connected to the positive power supply interface and the first end of the first inductor, and a second end of the first resistor is electrically connected to the anode of the first diode, the anode of the second diode, and the first end of the second inductor; The second end of the first inductor is electrically connected to the first end of the first bidirectional transient voltage suppressor diode, the anode of the third diode and the first normally open contact of the relay; The second end of the second inductor is electrically connected to the second end of the first bidirectional transient voltage suppressor diode, the passive negative interface, the first normally closed contact of the relay, and the second normally open contact of the relay.

9. The driving circuit according to claim 6, wherein: Also included is a suppression unit; The suppression unit is electrically connected to the positive-negative level switching unit; The suppression unit is used to absorb the electric energy after the magnetic latching contactor is powered off, and to discharge the reverse overvoltage electromotive force at the moment when the coil of the magnetic latching contactor is powered off and powered on.

10. The driving circuit according to claim 9, wherein: The suppression unit includes a second resistor, a third resistor, a first capacitor, a second capacitor, and a second bidirectional transient voltage suppression diode; A first end of the second bidirectional transient voltage suppression diode is electrically connected to the first end of the second resistor, the first end of the third resistor, and the first common end of the relay, and serves as a first output end of the drive circuit; a second end of the second bidirectional transient voltage suppression diode is electrically connected to the second end of the first capacitor, the second end of the second capacitor, and the second normally open contact of the magnetic latching contactor, and serves as a second output end of the drive circuit; The second end of the second resistor is electrically connected to the first end of the first capacitor, the second end of the third resistor, and the first end of the second capacitor.

11. A power supply, characterized in that: It comprises an AC input unit, a rectifier unit, a magnetic latching contactor, a DC power distribution unit, a control unit and a drive circuit according to any one of claims 1 to 10; The AC input unit, the rectifier unit, the magnetic latching contactor and the DC power distribution unit are electrically connected in sequence; The control unit is configured to output a power-off signal to the driving circuit; The driving circuit is used to output a positive pulse signal to control the magnetic holding contactor to be attracted, or output a negative pulse signal to control the magnetic holding contactor to be disconnected.

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