Switching device driving circuit and electronic equipment

Abstract

The utility model provides a switching device driving circuit and electronic equipment, the switching device driving circuit comprises a control circuit and a protection circuit, the control circuit is used for receiving a control signal, switching on a current output path in response to the received control signal being a high level, and not switching on the current output path in response to the received control signal being a low level; the protection circuit is connected to the current output path in series, the input end of the protection circuit is connected with the power supply, the output end of the protection circuit is connected with the control end of the switching device, and the protection circuit cuts off the current output path when responding to current on the current output path exceeding preset current. The protection circuit restores the current output path in response to the current on the current output path not exceeding the preset current and the control signal is at a high level. According to the scheme, when the current is recovered to be within the preset range and the control signal is at the high level, the protection circuit can conduct the current output path again, so that the circuit is recovered to be in a normal working state.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a switch device driving circuit and electronic equipment. Background Art

[0002] In the field of power electronics and automation control, switching device driver circuits are used to control the on / off states of power electronic devices. During actual use, switching device driver circuits may experience transient current anomalies. Existing driver circuits require a manual restart after overcurrent protection and the circuit returns to normal operation, impacting circuit efficiency. Utility Model Content

[0003] The main purpose of the utility model is to provide a switch device driving circuit and electronic equipment, which can automatically restore the normal operation of the circuit when the circuit returns to normal state after overcurrent protection.

[0004] In order to solve the above technical problems, the first technical solution provided by the present application is: to provide a switching device driving circuit, which includes: a control circuit and a protection circuit, wherein the control circuit is used to receive a control signal, and in response to receiving a high-level control signal, the current output path is turned on, and in response to receiving a low-level control signal, the current output path is not turned on; the protection circuit is connected in series on the current output path, the input end of the protection circuit is connected to the power supply, and the output end of the protection circuit is connected to the control end of the switching device, and the protection circuit cuts off the current output path in response to the current on the current output path exceeding a preset current, and restores the current output path in response to the current on the current output path not exceeding the preset current and the control signal is high.

[0005] Preferably, the control circuit includes a first switch unit, a first end of the first switch unit serves as an input end of the control circuit for receiving a control signal, a second end of the first switch unit is connected to the protection circuit, and a third end of the first switch unit is grounded.

[0006] Preferably, the protection circuit includes a first switching tube and a leakage circuit, the emitter of the first switching tube is connected to the first end of the leakage circuit, the collector of the first switching tube is connected to the control end of the switching device, the base of the first switching tube is connected to the second end of the first switching unit, the second end of the leakage circuit is connected to the power supply, and the third end of the leakage circuit is connected to the control circuit.

[0007] Preferably, the leakage circuit includes a first resistance unit, a third resistor and a second switching tube, one end of the first resistance unit is respectively connected to the power supply, the emitter of the second switching tube, and one end of the third resistor, the other end of the first resistance unit is connected to the emitter of the first switching tube, the base of the second switching tube is connected to the emitter of the first switching tube, the other end of the third resistor is connected to the collector of the second switching tube, and the collector of the second switching tube is connected to the base of the first switching tube.

[0008] Preferably, the first resistor unit includes a first resistor and a second resistor, one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the emitter of the first switching tube, and the second resistor is connected in parallel with the first resistor.

[0009] Preferably, a first diode is further included, wherein the cathode of the first diode is connected to the collector of the first switching tube, and the anode of the first diode is grounded.

[0010] Preferably, the control circuit further includes a fourth resistor, one end of the fourth resistor is connected to the second end of the first switch unit, and the other end of the fourth resistor is connected to the protection circuit.

[0011] Preferably, the first switching unit includes at least a fifth resistor, a sixth resistor and a third switching tube, one end of the fifth resistor serves as the first end of the first switching unit, the other end of the fifth resistor is connected to the base of the third switching tube, the collector of the third switching tube is connected to the protection circuit, the emitter of the third switching tube is grounded, one end of the sixth resistor is connected to the base of the third switching tube, and the other end of the sixth resistor is connected to the emitter of the third switching tube.

[0012] In order to solve the above technical problems, the present application also provides an electronic device, including the above switching device driving circuit.

[0013] The beneficial effects of the present application are different from the prior art. The switching device driving circuit of the present application includes a control circuit and a protection circuit. The control circuit is used to receive an external control signal and control the on and off of the current output path according to the level state of the control signal. When the control circuit receives a high-level control signal, the current output path is turned on. When the control circuit receives a low-level control signal, the current output path is not turned on. The protection circuit is connected in series in the current output path. When the current exceeds a preset range, the current output path is turned on. When the current returns to the preset range and the control signal is high, the protection circuit will re-turn on the current output path, so that the circuit returns to normal working state. There is no need to manually restart the circuit after encountering an overcurrent situation, thereby saving time and energy and improving the operation efficiency of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present application will be further described below with reference to the accompanying drawings and implementation methods, in which:

[0015] Figure 1This is a schematic diagram of a framework of an embodiment of a switch device driving circuit provided by the present application;

[0016] Figure 2 This is a circuit diagram of an embodiment of a switching device driving circuit provided by the present application;

[0017] Figure 3 It is a schematic diagram of the framework of an embodiment of an electronic device provided by this application. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. It will be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. It should also be noted that, for ease of description, the drawings only show parts of the structure relevant to the present application, not all of the structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application. The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed for the present invention is defined by the attached claims and their equivalents.

[0019] The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second" or "third" may explicitly or implicitly include at least one of such features. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to such processes, methods, products or devices.

[0020] The switching device driving circuit of the present application is suitable for driving high-side relays or solenoid valves for trucks or new energy pneumatics. In automobile drive relays, the use of high-side to control the relay can avoid the back electromotive force problem in the circuit, thereby effectively protecting the circuit from damage. However, the chips of existing high-side drive relays are expensive, the development cost is high, and the market supply is relatively limited, which poses application barriers.

[0021] In order to break the application barrier of high-side relays, this application provides a transformer drive circuit. Figure 1 , Figure 1 Schematic diagram of a switching device driving circuit according to an embodiment of the present invention. Figure 1 As shown, the switching device driving circuit 10 of this embodiment includes a control circuit 11 and a protection circuit 12, wherein the control circuit 11 is used to receive a control signal, and in response to receiving a high-level control signal, conduct the current output path, and in response to receiving a low-level control signal, not conduct the current output path; the protection circuit 12 is connected in series on the current output path, the input end of the protection circuit 12 is connected to the power supply, and the output end of the protection circuit 12 is connected to the control end of the switching device. The protection circuit 12 cuts off the current output path in response to the current on the current output path exceeding a preset current, and restores the current output path in response to the current on the current output path not exceeding the preset current and the control signal being high.

[0022] The switching device can be a high-side relay or a solenoid valve, etc. The current output path is the path from the power supply VIN through various electronic components to the control end of the switching device. The control signal can include a high-level signal and a low-level signal. The control signal can be provided by an external control device. The external device can be a controller, a control chip, a single-chip microcomputer, etc. For example, the control circuit 11 can be connected to the input / output pin of the single-chip microcomputer to receive the control signal sent by the single-chip microcomputer. In addition, the control signal can also be represented by Relay_MCU.

[0023] The above scheme cooperates with the control circuit 11 and the protection circuit 12. The control circuit 11 is used to receive an external control signal and control the on and off of the current output path according to the level state of the control signal. When the control circuit 11 receives a high-level control signal, the current output path is turned on. When a low-level control signal is received, the current output path is not turned on. The protection circuit 12 is connected in series in the current output path. When the current exceeds a preset range, the current output path is turned on. When the current returns to the preset range and the control signal is high, the protection circuit 12 will re-turn on the current output path, so that the circuit returns to normal working state. There is no need to manually restart the circuit after encountering an overcurrent situation, thereby saving time and energy and improving the operation efficiency of the circuit.

[0024] Please continue to refer to Figure 2 , Figure 2 This is a circuit diagram of an embodiment of a switch device driving circuit provided by this application. Figure 2As shown, in some embodiments, the control circuit 11 includes a first switch unit 21, the first end of the first switch unit 21 serves as an input end of the control circuit 11, and is used to receive a control signal, the second end of the first switch unit 21 is connected to the protection circuit 12, and the third end of the first switch unit 21 is grounded.

[0025] Specifically, the first end of the first switch unit 21 is used to receive a control signal, and the first switch unit 21 is instructing to turn on or off according to the control signal. The second end of the first switch unit 21 is connected to the protection circuit 12. When the first switch unit 21 is turned on, the current output path is turned on. When the switch unit is turned off, the current output path is not turned on.

[0026] In other embodiments, the control circuit 11 may include a field-effect transistor, the gate of the field-effect transistor being connected to a control signal, and the on / off state of the current output path being controlled by controlling the voltage across the field-effect transistor. In other embodiments, the control circuit 11 may also include an optocoupler, which is used to isolate the input and output circuits. When the control signal is high, the optocoupler's light-emitting diode emits light, turning on the phototransistor, thereby conducting the current output path. When the control signal is low, the optocoupler does not emit light, the phototransistor is turned off, and the current output path is not conducted.

[0027] In some embodiments, the protection circuit 12 includes a first switch tube Q1 and a leakage circuit, the emitter of the first switch tube Q1 is connected to the first end of the leakage circuit, the collector of the first switch tube Q1 is connected to the control end of the switching device, the base of the first switch tube Q1 is connected to the second end of the first switch unit 21, the second end of the leakage circuit is connected to the power supply, and the third end of the leakage circuit is connected to the control circuit 11.

[0028] Specifically, when the control signal is high, the control circuit 11 turns on the first switch Q1, thereby opening the current output path and driving the switching device. If a short circuit occurs in the path between the collector of the first switch Q1 and the control terminal of the switching device, the current flowing through the first switch Q1 increases rapidly, the leakage circuit turns on, and the output of the first switch Q1 is turned off, allowing the current to be released through the leakage circuit, thus achieving the circuit protection function. After the short circuit disappears, the current flowing through the first switch Q1 resumes, the leakage circuit closes, and the first switch Q1 resumes outputting current, controlling the relay to operate, and automatically restoring normal operation of the circuit.

[0029] In some embodiments, the leakage circuit includes a first resistance unit 22, a third resistor R3, and a second switch tube Q2. One end of the first resistance unit 22 is respectively connected to the power supply, the emitter of the second switch tube Q2, and one end of the third resistor R3. The other end of the first resistance unit 22 is connected to the emitter of the first switch tube Q1, the base of the second switch tube Q2 is connected to the emitter of the first switch tube Q1, the other end of the third resistor R3 is connected to the collector of the second switch tube Q2, and the collector of the second switch tube Q2 is connected to the base of the first switch tube Q1.

[0030] Specifically, when the control signal is at a high level, the control circuit 11 turns on the first switch Q1, thereby conducting the current output path and driving the switching device to operate. At this time, the leakage circuit is inoperative and the second switch is in an off state. If a short circuit occurs in the path between the collector of the first switch Q1 and the control terminal of the switching device, the current flowing through the first switch Q1 increases rapidly, causing the voltage of the first resistor unit 22 to increase. When this voltage reaches the turn-on voltage of the second switch Q2, the second switch Q2 turns on, and the collector voltage of the second switch Q2 drops, causing the base voltage of the first switch Q1 and the emitter voltage of the first switch Q1 to be close to or even equal. This turns off the output of the first switch Q1, allowing current to flow to the ground terminal through the second switch Q2 of the leakage circuit, thereby forming a leakage path and achieving the circuit protection function. After the short circuit disappears, the voltage at the base of the second switch tube Q is restored, causing the second switch tube Q2 to be turned off. If the control signal is still at a high level at this time, the first switch tube Q1 is turned on again and outputs current. The output current can be represented by Relay_out, which controls the operation of the switching device and realizes the normal operation of the automatic recovery circuit.

[0031] It is understood that the first resistor unit 22 can be composed of a single resistor or multiple resistors. In some application scenarios, the first resistor unit 22 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the power supply, the other end of the first resistor R1 is connected to the emitter of the first switch Q1, and the second resistor R2 is connected in parallel with the first resistor R1. Using multiple resistors in parallel can achieve a current diversion effect, increase the heat dissipation surface, improve heat dissipation efficiency, and reduce heat generation caused by large currents.

[0032] In some embodiments, the first switch unit 21 includes at least a fifth resistor R5, a sixth resistor R6 and a third switch tube Q3, one end of the fifth resistor R5 serves as the first end of the first switch unit 21, the other end of the fifth resistor R5 is connected to the base of the third switch tube Q3, the collector of the third switch tube Q3 is connected to the protection circuit 12, the emitter of the third switch tube Q3 is grounded, one end of the sixth resistor R6 is connected to the base of the third switch tube Q3, and the other end of the sixth resistor R6 is connected to the emitter of the third switch tube Q3.

[0033] Specifically, when the control signal is high, current flows through the fourth resistor R4 to the base of the third switch Q3, turning on the third switch Q3. After the third switch Q3 turns on, the collector voltage of the third switch Q3 drops, thereby affecting the base voltage of the first switch Q1. When the base voltage of the first switch Q1 drops sufficiently to turn on the first switch Q1, the current output path is turned on. In some specific embodiments, the control circuit 11 further includes a fourth resistor R4, one end of which is connected to the second end of the first switch unit 21, and the other end of which is connected to the protection circuit 12. The collector voltage of the third switch drops, affecting the base voltage of the first switch Q1 through the fourth resistor R4, turning on the current output path. In the event of a short circuit, the second switch Q2 turns on, turning off the output of the first switch Q1. When the short circuit is eliminated, the voltage at the base of the second switch tube Q2 is restored and the second switch tube Q2 is turned off. If the control signal is still high at this time, the third switch tube Q2 will be turned on again, thereby turning on the first switch tube Q1, outputting the current control switch device, and re-opening the current output path, so that the circuit returns to normal working state.

[0034] In some specific embodiments, the switching device driving circuit 10 further includes a first diode D1, wherein the cathode of the first diode D1 is connected to the collector of the first switching transistor Q1, and the anode of the first diode D1 is grounded. This provides a discharge path to ground for the first switching transistor Q1, thereby protecting the first switching transistor Q1 from damage.

[0035] The above scheme cooperates with the control circuit 11 and the protection circuit 12. The control circuit 11 is used to receive an external control signal and control the on and off of the current output path according to the level state of the control signal. When the control circuit 11 receives a high-level control signal, the current output path is turned on. When a low-level control signal is received, the current output path is not turned on. The protection circuit 12 is connected in series in the current output path. When the current exceeds a preset range, the current output path is turned on. When the current returns to the preset range and the control signal is high, the protection circuit 12 will re-turn on the current output path, so that the circuit returns to normal working state. There is no need to manually restart the circuit after encountering an overcurrent situation, thereby saving time and energy and improving the operation efficiency of the circuit.

[0036] This application also provides an electronic device, see Figure 3 , Figure 3 1 is a schematic diagram of a framework of an embodiment of an electronic device provided by the present application. The electronic device 30 of this embodiment includes the switching device drive circuit 10 of the above embodiment. Optionally, the electronic device 30 includes a device containing the switching device drive circuit 10, such as a high-side relay unit or a solenoid valve unit in a new energy vehicle.

[0037] The above scheme cooperates with the control circuit 11 and the protection circuit 12. The control circuit 11 is used to receive an external control signal and control the on and off of the current output path according to the level state of the control signal. When the control circuit 11 receives a high-level control signal, the current output path is turned on. When a low-level control signal is received, the current output path is not turned on. The protection circuit 12 is connected in series in the current output path. When the current exceeds a preset range, the current output path is turned on. When the current returns to the preset range and the control signal is high, the protection circuit 12 will re-turn on the current output path, so that the circuit returns to normal working state. There is no need to manually restart the circuit after encountering an overcurrent situation, thereby saving time and energy and improving the operation efficiency of the circuit.

[0038] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A switching device driving circuit, characterized in that: include: A control circuit receives a control signal, and in response to receiving a control signal at a high level, conducts a current output path, and in response to receiving a control signal at a low level, blocks the current output path; Protection circuit: connected in series on the current output path, the input end of the protection circuit is connected to the power supply, the output end of the protection circuit is connected to the control end of the switching device, the protection circuit cuts off the current output path in response to the current on the current output path exceeding the preset current, and restores the current output path in response to the current on the current output path not exceeding the preset current and the control signal is at a high level.

2. The switching device driving circuit according to claim 1, wherein: The control circuit includes a first switch unit, a first end of the first switch unit serves as an input end of the control circuit for receiving the control signal, a second end of the first switch unit is connected to the protection circuit, and a third end of the first switch unit is grounded.

3. The switching device driving circuit according to claim 2, wherein: The protection circuit includes a first switching tube and a leakage circuit, the emitter of the first switching tube is connected to the first end of the leakage circuit, the collector of the first switching tube is connected to the control end of the switching device, the base of the first switching tube is connected to the second end of the first switching unit, the second end of the leakage circuit is connected to the power supply, and the third end of the leakage circuit is connected to the control circuit.

4. The switching device driving circuit according to claim 3, wherein: The leakage circuit includes a first resistance unit, a third resistor and a second switching tube. One end of the first resistance unit is respectively connected to the power supply, the emitter of the second switching tube, and one end of the third resistor. The other end of the first resistance unit is connected to the emitter of the first switching tube, the base of the second switching tube is connected to the emitter of the first switching tube, the other end of the third resistor is connected to the collector of the second switching tube, and the collector of the second switching tube is connected to the base of the first switching tube.

5. The switching device driving circuit according to claim 4, wherein: The first resistor unit includes a first resistor and a second resistor, one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the emitter of the first switch tube, and the second resistor is connected in parallel with the first resistor.

6. The switching device driving circuit according to claim 4, wherein: It also includes a first diode, wherein the cathode of the first diode is connected to the collector of the first switch tube, and the anode of the first diode is grounded.

7. The switching device driving circuit according to claim 2, wherein: The control circuit further includes a fourth resistor, one end of the fourth resistor is connected to the second end of the first switch unit, and the other end of the fourth resistor is connected to the protection circuit.

8. The switching device driving circuit according to claim 2 or 3 or 4 or 5 or 7, characterized in that: The first switching unit includes at least a fifth resistor, a sixth resistor and a third switching tube, one end of the fifth resistor serves as the first end of the first switching unit, the other end of the fifth resistor is connected to the base of the third switching tube, the collector of the third switching tube is connected to the protection circuit, the emitter of the third switching tube is grounded, one end of the sixth resistor is connected to the base of the third switching tube, and the other end of the sixth resistor is connected to the emitter of the third switching tube.

9. An electronic device, characterized in that: The switching device driving circuit comprises the switching device driving circuit according to any one of claims 1 to 8.

Images