Driving device

Abstract

The utility model provides a driving device. In the driving device, a turn-off instruction of a first switch device is received by the first switch device when a controller receives a first detection result, and the first detection result represents that a driving circuit does not stop supplying power to a coil in a relay after the controller issues an instruction for controlling the relay to be turned off; the first switching device is switched off after the controller issues an instruction for controlling the relay to be switched off but the driving circuit does not stop supplying power to the coil. The first switch device is connected in series with all devices in the driving circuit, namely, if the first switch device is switched off, the driving circuit can be disconnected, so that after the controller issues an instruction for controlling the relay to be switched off but the driving circuit does not stop supplying power to the coil, the power supply of the driving circuit to the coil can be stopped; therefore, the driving device can improve the disconnection reliability of the relay.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a driving device. Background Art

[0002] Generally, the control of the DC high-voltage system of an electric vehicle is realized by a relay. Therefore, designing a safe and reliable driving circuit for the relay is very important for the DC high-voltage system.

[0003] At present, when the controller issues an instruction to control the relay to disconnect, the relay may not be able to disconnect normally due to uncontrollable factors, that is, the relay still remains energized, thereby reducing the disconnection reliability of the relay, and further causing miscontrol of the DC high-voltage system, that is, reducing the control reliability of the DC high-voltage system.

[0004] Therefore, how to improve the disconnection reliability of the relay is a technical problem to be solved urgently. Summary of the Utility Model

[0005] In view of this, the utility model provides a driving device to improve the disconnection reliability of the relay.

[0006] To achieve the above object, the embodiments of the utility model provide the following technical solutions:

[0007] The present application provides a driving device, including: a driving circuit, a controller, a first switching device, and a current detection circuit; wherein:

[0008] The current detection circuit and the coil in the relay are connected in series, and both ends of the formed series branch are respectively connected to the two poles of the output end of the driving circuit, and the control end of the driving circuit is connected to an output end of the controller;

[0009] The output end of the current detection circuit is connected to the input end of the controller, and the first detection result of the current detection circuit indicates that the driving circuit does not stop supplying power to the coil after the controller issues an instruction to control the relay to disconnect;

[0010] The first switching device is connected in series with all components in the driving circuit, the control end of the first switching device is connected to another output end of the controller, and the turn-off instruction of the first switching device is received by the first switching device when the controller receives the first detection result.

[0011] Optionally, the driving circuit includes: a power supply unit and a second switching device; wherein:

[0012] The power supply unit is provided with at least one input end, and the input ends of the power supply unit are respectively connected to the power supplies in one-to-one correspondence;

[0013] The number of output terminals of the power supply unit is the same as the number of its input terminals, and each output terminal of the power supply unit is connected to the input terminal of the second switching device;

[0014] The two poles of the output terminal of the second switching device are respectively used as the two output terminals of the drive circuit, and the control terminal of the second switching device is used as the control terminal of the drive circuit.

[0015] Optionally, the power supply unit includes: a first power supply and a second power supply; where:

[0016] The input terminal of the first power supply is connected to the first power source, and the input terminal of the second power supply is connected to the second power source;

[0017] The output terminal of the first power supply and the output terminal of the second power supply are both connected to the input terminal of the second switching device.

[0018] Optionally, the first power source is a power battery and the second power source is a storage battery.

[0019] Optionally, both the first power supply and the second power supply are isolated power supplies.

[0020] Optionally, the drive circuit further includes: an anti-reverse device; where:

[0021] The anti-reverse device is provided with an input terminal and an output terminal. Each output terminal of the power supply unit is connected to the input terminal of the anti-reverse device, and the output terminal of the anti-reverse device is connected to the input terminal of the second switching device; or,

[0022] If the power supply unit is provided with at least two output terminals, the anti-reverse device is provided with at least two input terminals. The output terminals of the power supply unit are connected to the input terminals of the anti-reverse device in one-to-one correspondence. The number of output terminals of the anti-reverse device is the same as the number of input terminals of the anti-reverse device, and each output terminal of the anti-reverse device is connected to the input terminal of the second switching device.

[0023] Optionally, each input terminal of the power supply unit is connected to the corresponding power source through the first switching device; or,

[0024] Each output terminal of the power supply unit is connected to the input terminal of the first switching device, and the output terminal of the first switching device is connected to the input terminal of the second switching device; or,

[0025] The output terminal of the second switching device is connected to the input terminal of the first switching device, and the two poles of the output terminal of the first switching device are respectively connected to the two ends of the coil.

[0026] Optionally, if each input terminal of the power supply unit is connected to a corresponding power supply through the first switching device, and the power supply unit includes a first power supply and a second power supply, then the first switching device includes: a first switching device and a second switching device; where:

[0027] The positive electrode of the input terminal of the first power supply is connected to the positive electrode of the first power supply through the first switching device, and the negative electrode of the input terminal of the first power supply is connected to the negative electrode of the first power supply;

[0028] The positive electrode of the input terminal of the second power supply is connected to the positive electrode of the second power supply through the second switching device, and the negative electrode of the input terminal of the second power supply is connected to the negative electrode of the second power supply.

[0029] Optionally, the first switching device and the second switching device both include: a MOS transistor or an IGBT.

[0030] Optionally, it further includes: a latch; where:

[0031] The control terminal of the drive circuit is connected to the corresponding output terminal of the controller through the latch.

[0032] As can be seen from the above technical solutions, the present invention provides a driving device. In this driving device, since the turn-off instruction of the first switching device is received by the first switching device when the controller receives the first detection result, and the first detection result indicates that the drive circuit does not stop supplying power to the coil in the relay after the controller issues an instruction to control the relay to disconnect, so the first switching device is turned off after the controller issues an instruction to control the relay to disconnect but the drive circuit does not stop supplying power to the coil; and since the first switching device is connected in series with all the components in the drive circuit, that is, if the first switching device is turned off, the drive circuit can be made into an open circuit, so after the controller issues an instruction to control the relay to disconnect but the drive circuit does not stop supplying power to the coil, the power supply of the drive circuit to the coil can be stopped, thereby ensuring that the relay can be normally disconnected. Therefore, this driving device can improve the disconnection reliability of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0034] Figures 1 - 8 Structural schematic diagrams of eight embodiments of the driving device provided in the present application are respectively shown. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] In the present application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0037] To improve the disconnection reliability of the relay 01, an embodiment of the present application provides a driving device, and its specific structure can be referred to Figures 1 - 3 , specifically including: a driving circuit 10, a controller 20, a first switching device 30, and a current detection circuit 40; the connection relationships between the components are specifically described as follows:

[0038] The current detection circuit 40 and the coil in the relay 01 are connected in series, and both ends of the formed series branch are respectively connected to the two poles of the output end of the driving circuit 10, and the control end of the driving circuit 10 is connected to an output end of the controller 20. [[ID=I7]]

[0039] In a specific example, as Figures 1 - 3 shown, the positive pole of the output end of the driving circuit 10 is connected to one end of the coil, and the other end of the coil is connected to the negative pole of the output end of the driving circuit 10 through the current detection circuit 40.

[0040] The above example only shows a connection manner among the current detection circuit 40, the coil in the relay 01, and the output end of the driving circuit 10. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of the present application.

[0041] The output end of the current detection circuit 40 is connected to the input end of the controller 20; the first detection result of the current detection circuit 40 indicates that when the controller 20 issues an instruction to control the relay 01 to disconnect, the drive circuit 10 does not stop supplying power to the coil.

[0042] The first switching device 30 is connected in series with all components in the drive circuit 10, the control end of the first switching device 30 is connected to another output end of the controller 20, and the turn-off instruction of the first switching device 30 is received by the first switching device 30 when the controller 20 receives the first detection result.

[0043] The specific working principle of this drive device is described as follows:

[0044] When it is necessary to control the relay 01 to disconnect, the controller 20 issues an instruction to control the relay 01 to disconnect; when the drive circuit 10 receives this instruction, the drive circuit 10 stops driving the relay 01, that is, the coil in the relay 01 loses power, so that the relay 01 disconnects.

[0045] After the controller 20 issues an instruction to control the relay 01 to disconnect, the controller 20 uses the current detection circuit 40 to detect the output current of the drive circuit 10.

[0046] When the current detection circuit 40 detects that the output current of the drive circuit 10 is not zero, it indicates that the drive circuit 10 does not stop supplying power to the coil, so it is determined that the relay 01 has not been normally disconnected. Therefore, the controller 20 issues a turn-off instruction to the first switching device 30; when the first switching device 30 receives the turn-off instruction, it turns itself off; among them, the detection result of the current detection circuit 40 at this time is the first detection result.

[0047] When the current detection circuit 40 detects that the output current of the drive circuit 10 is zero, it indicates that the drive circuit 10 stops supplying power to the coil, so it is determined that the relay 01 is normally disconnected. Therefore, the controller 20 still issues a conduction instruction to the first switching device 30; when the first switching device 30 receives the conduction instruction, it remains in the conduction state; among them, the detection result of the current detection circuit 40 at this time is the second detection result.

[0048] It should be noted that usually, the controller 20 issues a conduction instruction to the first switching device 30, that is, the first switching device 30 is usually in the conduction state.

[0049] Before the controller 20 issues an instruction to disconnect the control relay 01, the controller 20 uses the current detection circuit 40 to detect the output current of the drive circuit 10; when the current detection circuit 40 detects that the output current of the drive circuit 10 is equal to zero, it indicates that the drive circuit 10 has stopped supplying power to the coil, that is, the drive circuit 10 has an open circuit fault, so it is determined that the relay 01 is malfunctioning; when the current detection circuit 40 detects that the output current of the drive circuit 10 is not equal to zero, it indicates that the drive circuit 10 has not stopped supplying power to the coil, that is, the drive circuit 10 has no open circuit fault, so it is determined that the relay 01 is working normally.

[0050] When it is necessary to control the relay 01 to close, the controller 20 issues an instruction to control the relay 01 to close; when the drive circuit 10 receives this instruction, the drive circuit 10 drives the relay 01, that is, the coil in the relay 01 is energized, so that the relay 01 closes.

[0051] After the controller 20 issues an instruction to control the relay 01 to close, the controller 20 uses the current detection circuit 40 to detect the output current of the drive circuit 10.

[0052] When the current detection circuit 40 detects that the output current of the drive circuit 10 is within the preset current range, it indicates that the drive circuit 10 is supplying power to the coil normally, so it is determined that the relay 01 closes normally; when the current detection circuit 40 detects that the output current of the drive circuit 10 is not within the preset current range, it indicates that the power supply of the drive circuit 10 to the coil is abnormal, so it is determined that the relay 01 has not closed, or it is determined that the relay 01 has closed but there is a safety risk. At this time, the controller 20 issues an instruction to control the relay 01 to disconnect, and controls the relay 01 to disconnect.

[0053] Among them, the preset current range is set according to the actual situation and is not specifically limited here; usually, the preset working voltage range of the relay 01 corresponding to the preset current range is 9V~16V.

[0054] Before the controller 20 issues an instruction to control the relay 01 to close, the controller 20 uses the current detection circuit 40 to detect the output current of the drive circuit 10; when the current detection circuit 40 detects that the output current of the drive circuit 10 is not equal to zero, it indicates that the drive circuit 10 has not stopped supplying power to the coil, that is, the drive circuit 10 has a sticking fault, so it is determined that the relay is malfunctioning; when the current detection circuit 40 detects that the output current of the drive circuit 10 is equal to zero, it indicates that the drive circuit 10 has stopped supplying power to the coil, that is, the drive circuit 10 has no sticking fault, so it is determined that the relay is working normally.

[0055] Since the turn-off instruction of the first switching device 30 is received by the first switching device 30 when the controller 20 receives the first detection result, and the first detection result indicates that the driving circuit 10 does not stop supplying power to the coil in the relay 01 after the controller 20 issues an instruction to control the relay 01 to disconnect, the first switching device 30 is turned off after the controller 20 issues an instruction to control the relay 01 to disconnect but the driving circuit 10 does not stop supplying power to the coil; and since the first switching device 30 is connected in series with all the components in the driving circuit 10, that is, if the first switching device 30 is turned off, the driving circuit 10 can be made into an open circuit, so after the controller 20 issues an instruction to control the relay 01 to disconnect but the driving circuit 10 does not stop supplying power to the coil, the power supply of the driving circuit 10 to the coil can be stopped, thereby ensuring that the relay 01 disconnects normally. Therefore, this driving device can improve the disconnection reliability of the relay 01.

[0056] In addition, since the current detection circuit 40 can also be used to detect whether the relay 01 is normally attracted after the controller 20 issues an instruction to control the relay 01 to be attracted, the attraction reliability of the relay 01 can also be improved.

[0057] In summary, this driving device can ensure the reliable attraction and disconnection of the relay 01, thereby improving the control reliability of the DC high-voltage system.

[0058] Another embodiment of the present application provides a specific implementation manner of the driving circuit 10, and its specific structure can be seen in Figures 1 - 3 , which specifically includes: a power supply unit 11 and a second switching device 12; the connection relationship between the components is specifically described as follows:

[0059] The power supply unit 11 is provided with at least one input terminal, and the input terminals of the power supply unit 11 are connected to the power supplies in one-to-one correspondence; for example, as Figures 1 - 3 ( Figures 1 - 3 only taking the power supply unit 11 having two input terminals as an example for display) shown, the first input terminal of the power supply unit 11 is connected to the first power supply 02, and the second input terminal of the power supply unit 11 is connected to the second power supply 03.

[0060] The number of output terminals of the power supply unit 11 is the same as the number of its own input terminals, and each output terminal of the power supply unit 11 is connected to the input terminal of the second switching device 12.

[0061] The two poles of the output terminal of the second switching device 12 are used as the two poles of the output terminal of the driving circuit 10; the control terminal of the second switching device 12 is used as the control terminal of the driving circuit 10.

[0062] In a specific example, each input terminal of the power supply unit 11 is connected to the corresponding power supply through the first switching device 30.

[0063] For example, as Figure 1 shown, the first input terminal of the power supply unit 11 is connected to the first power supply 02 through the first switching device 30, and the second input terminal of the power supply unit 11 is connected to the second power supply 03 through the first switching device 30.

[0064] In another specific example, each output terminal of the power supply unit 11 is connected to the input terminal of the first switching device 30, and the output terminal of the first switching device 30 is connected to the input terminal of the second switching device 12.

[0065] For example, as Figure 2 shown, the first output terminal and the second output terminal of the power supply unit 11 are both connected to the input terminal of the first switching device 30, and the output terminal of the first switching device 30 is connected to the input terminal of the second switching device 12.

[0066] In yet another specific example, as Figure 3 shown, the output terminal of the second switching device 12 is connected to the input terminal of the first switching device 30, and both poles of the output terminal of the first switching device 30 are connected to both ends of the coil.

[0067] The above three examples only show three series connection methods of the first switching device 30 in the drive circuit 10. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0068] This embodiment provides an implementation manner of the second switching device 12, and its specific structure can be referred to Figure 4 ( Figure 4 shown on the basis of Figure 1 ), and it specifically includes: a third switching device 121.

[0069] The positive pole of the input terminal of the second switching device 12 is connected to the positive pole of the output terminal of the second switching device 12, the negative pole of the input terminal of the second switching device 12 is connected to the negative pole of the output terminal of the second switching device 12 through the third switching device 121, and the control terminal of the third switching device 121 serves as the control terminal of the second switching device 12.

[0070] Optionally, the third switching device 121 can be a MOS transistor or an IGBT. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0071] The above is only a specific implementation manner of the second switching device 12. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0072] This embodiment also provides an implementation manner of the power supply unit 11, and its specific structure can be referred to Figure 5 ( Figure 5 only shown Figure 4 on this basis), and it specifically includes: a first power supply 111 and a second power supply 112.

[0073] The input end of the first power supply 111 is connected to the first power source 02 through the first switching device 30, and the input end of the second power supply 112 is connected to the second power source 03 through the first switching device 30; the output ends of the first power supply 111 and the second power supply 112 are both connected to the input end of the second switching device 12.

[0074] It should be noted that the power supply is already very mature in the prior art, and no further detailed description will be given here; usually, in this driving device, the voltage output by the power supply is 12V.

[0075] Optionally, the first power source 02 can be a power battery, and the second power source 03 can be a storage battery. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0076] It should be noted that usually, the voltage of the power battery is between 150V and 400V. No limitation is made on the voltage of the power battery here, and it can be determined according to specific situations.

[0077] Optionally, the storage battery can be a lead-acid battery. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0078] It should be noted that usually, the voltage of the lead-acid battery is between 4.5V and 28V. No limitation is made on the voltage of the lead-acid battery here, and it can be determined according to specific situations.

[0079] Optionally, both the first power supply 111 and the second power supply 112 can be isolated power supplies. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0080] In this implementation manner of the power supply unit 11, the two power supplies are backup to each other, so the possibility that the driving circuit 10 cannot drive the relay 01 normally can be reduced, thereby improving the working stability of the relay 01.

[0081] The above is only a specific implementation manner of the power supply unit 11. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0082] Another specific implementation of the driving circuit 10 is also provided in this embodiment. For its specific structure, reference can be made to Figure 6 ( Figure 6 only shown on the basis of Figure 5 ). On the basis of the above embodiment, this embodiment further includes: an anti-reverse device; a connection relationship between the anti-reverse device and other components is specifically described as follows:

[0083] The anti-reverse device is provided with an input end and an output end. Each output end of the power supply unit 11 is connected to the input end of the anti-reverse device, and the output end of the anti-reverse device is connected to the input end of the second switching device 12.

[0084] Another connection relationship between the anti-reverse device and other components is specifically described as follows:

[0085] If the power supply unit 11 is provided with at least two output ends, the anti-reverse device is provided with at least two input ends. The output ends of the power supply unit 11 are connected to the input ends of the anti-reverse device in one-to-one correspondence. The number of output ends of the anti-reverse device is the same as the number of input ends of the anti-reverse device. Each output end of the anti-reverse device is connected to the input end of the second switching device 12.

[0086] For example, as Figure 6 shown, the power supply unit 11 is provided with two output ends, the anti-reverse device is provided with two input ends. The first output end of the power supply unit 11 is connected to the first input end of the anti-reverse device, and the second output end of the power supply unit 11 is connected to the second input end of the anti-reverse device; the anti-reverse device is provided with two output ends, and the first output end and the second output end of the anti-reverse device are both connected to the input end of the second switching device 12.

[0087] In a specific example, as Figure 6 shown, the anti-reverse device specifically includes: a first diode branch 131 and a second diode branch 132. The positive pole of the first input end of the anti-reverse device is connected to the anode of the first diode branch 131, the cathode of the first diode branch 131 is connected to the positive pole of the first output end of the anti-reverse device, and the negative pole of the first input end of the anti-reverse device is connected to the negative pole of the first output end of the anti-reverse device; the positive pole of the second input end of the anti-reverse device is connected to the anode of the second diode branch 132, the cathode of the second diode branch 132 is connected to the positive pole of the second output end of the anti-reverse device, and the negative pole of the second input end of the anti-reverse device is connected to the negative pole of the second output end of the anti-reverse device.

[0088] Among them, the first diode branch 131 includes at least one diode. If the number of diodes is greater than 1, all the diodes are connected in series in the same direction, and the anode of the formed series branch serves as the anode of the first diode branch 131, and the cathode serves as the cathode of the first diode branch 131; if the number of diodes is equal to 1, the anode of the diode serves as the anode of the first diode branch 131, and the cathode serves as the cathode of the first diode branch 131. For example, as shown by the diode Z1 in Figure 6 shown.

[0089] The second diode branch 132 includes at least one diode. If the number of diodes is greater than 1, all the diodes are connected in series in the same direction, and the anode of the formed series branch serves as the anode of the second diode branch 132, and the cathode serves as the cathode of the second diode branch 132; if the number of diodes is equal to 1, the anode of the diode serves as the anode of the second diode branch 132, and the cathode serves as the cathode of the second diode branch 132. For example, as shown by the diode Z2 in Figure 6 shown.

[0090] The above examples only show one implementation manner of the reverse protection device. In actual applications, it includes but is not limited to this. No specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application.

[0091] This embodiment also provides a specific implementation manner of the first switching device 30, which is applicable to the situation where each input end of the power supply unit is connected to the corresponding power supply through the first switching device 30, and the power supply unit 11 includes the first power supply 111 and the second power supply 112; the specific structure of this implementation manner can be seen in Figure 7 (The figure is only shown on the basis of Figure 6 ), and it specifically includes: the first switching device 31 and the second switching device 32; the connection relationship between each device is specifically described as follows:

[0092] The positive pole of the input end of the first power supply 111 is connected to the positive pole of the first power supply 02 through the first switching device 31, and the negative pole of the input end of the first power supply 111 is connected to the negative pole of the first power supply 02.

[0093] Optionally, the first switching device 31 can be a MOS transistor or an IGBT. In actual applications, it includes but is not limited to this. No specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application; for example, as shown by the MOS transistor M1 in Figure 7 shown.

[0094] The positive pole of the input end of the second power supply 112 is connected to the positive pole of the second power supply 03 through the second switching device 32, and the negative pole of the input end of the second power supply 112 is connected to the negative pole of the second power supply 03.

[0095] Optionally, the second switching device 32 can be a MOS transistor or an IGBT. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application. For example, such as Figure 7 the MOS transistor M2 in

[0096] The above is only one implementation manner of the first switching device 30. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application.

[0097] Another embodiment of this application provides another implementation manner of the driving device, and its specific structure can be referred to Figure 8 ( Figure 8 only shown on the basis of Figure 7 ). On the basis of the above implementation manner, this implementation manner further includes: a latch 50; the connection relationship between this device and other devices is specifically described as follows:

[0098] The control end of the driving circuit 10 is connected to the corresponding output end of the controller 20 through the latch 50.

[0099] It should be noted that the latch 50 is already very mature in the prior art, and no further detailed description is made here.

[0100] When the driving circuit 10 normally drives the relay 01, the latch 50 can latch the instruction for controlling the relay 01 to be attracted sent by the controller 20. When the controller 20 has abnormal reset and other faults, the latch 50 can continue to send the instruction for controlling the relay 01 to be attracted to the driving circuit 10, so that the driving circuit 10 can continue to drive the relay 01, that is, the coil in the relay 01 continues to be energized, and further the relay 01 remains in the attracted state. Therefore, this implementation manner can prevent the abnormal disconnection of the relay 01 when the controller 20 has abnormal reset and other faults, that is, further ensure the attraction reliability of the relay 01.

[0101] Regarding the above description of the disclosed embodiments, the features described in each embodiment in this specification can be replaced or combined with each other, enabling those skilled in the art to implement or use this application. As described above, it is only a preferred embodiment of the present utility model and does not impose any formal restrictions on the present utility model. Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can, without departing from the scope of the technical solution of the present utility model, make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A driving device, characterized in that, Comprising: A drive circuit, a controller, a first switching device, and a current detection circuit; wherein: The current detection circuit and the coil in the relay are connected in series, and both ends of the formed series branch are respectively connected to two poles of the output end of the drive circuit, and the control end of the drive circuit is connected to an output end of the controller; The output end of the current detection circuit is connected to the input end of the controller, and the first detection result of the current detection circuit characterizes that the drive circuit does not stop supplying power to the coil after the controller issues an instruction to control the relay to disconnect; The first switching device is connected in series with all components in the drive circuit, the control end of the first switching device is connected to another output end of the controller, and the turn-off instruction of the first switching device is received by the first switching device when the controller receives the first detection result.

2. The drive device according to claim 1, wherein The drive circuit includes: a power supply unit and a second switching device; wherein: The power supply unit is provided with at least one input end, and the input ends of the power supply unit are connected to power supplies in one-to-one correspondence; The number of output ends of the power supply unit is the same as the number of its input ends, and each output end of the power supply unit is connected to the input end of the second switching device; Both poles of the output end of the second switching device are respectively used as two of the output ends of the drive circuit, and the control end of the second switching device is used as the control end of the drive circuit.

3. The drive device according to claim 2, characterized in that, The power supply unit includes: a first power supply and a second power supply; wherein: The input end of the first power supply is connected to the first power supply, and the input end of the second power supply is connected to the second power supply; The output end of the first power supply and the output end of the second power supply are both connected to the input end of the second switching device.

4. The drive device according to claim 3, characterized in that, The first power supply is a power battery, and the second power supply is a storage battery.

5. The drive device according to claim 3, characterized in that, Both the first power supply and the second power supply are isolated power supplies.

6. The drive device according to any one of claims 2 to 5, characterized in that, The drive circuit further includes: an anti-reverse device; wherein: The anti-reverse device is provided with one input end and one output end, each output end of the power supply unit is connected to the input end of the anti-reverse device, and the output end of the anti-reverse device is connected to the input end of the second switching device; or, If the power supply unit is provided with at least two output ends, then the anti-reverse device is provided with at least two input ends, the output ends of the power supply unit are connected to the input ends of the anti-reverse device in one-to-one correspondence, the number of output ends of the anti-reverse device is the same as the number of its input ends, and each output end of the anti-reverse device is connected to the input end of the second switching device.

7. The drive device according to any one of claims 2 to 5, characterized in that Each input end of the power supply unit is connected to the corresponding power supply through the first switching device; or, Each output end of the power supply unit is connected to the input end of the first switching device, and the output end of the first switching device is connected to the input end of the second switching device; Or, The output end of the second switching device is connected to the input end of the first switching device, and both poles of the output end of the first switching device are respectively connected to both ends of the coil.

8. The drive device according to claim 7, characterized in that, If each input terminal of the power supply unit is connected to a corresponding power source through the first switching device, and the power supply unit includes a first power supply and a second power supply, then the first switching device includes: a first switching device and a second switching device; wherein: The positive pole of the input terminal of the first power supply is connected to the positive pole of the first power source through the first switching device, and the negative pole of the input terminal of the first power supply is connected to the negative pole of the first power source; The positive pole of the input terminal of the second power supply is connected to the positive pole of the second power source through the second switching device, and the negative pole of the input terminal of the second power supply is connected to the negative pole of the second power source.

9. The drive device according to claim 8, characterized in that The first switching device and the second switching device each include: a MOS transistor or an IGBT.

10. The drive device according to any one of claims 1 to 5, characterized in that, It further includes: A latch; wherein: The control terminal of the drive circuit is connected to the corresponding output terminal of the controller through the latch.

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