Control circuit of switch tube, controller and vehicle
By combining voltage conversion circuits and controllable switching units, the problems of high cost and slow response speed of NMOS transistors in vehicle controllers are solved, achieving low cost and fast protection.
Patent Information
- Application Number
- CN202520252569.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-02-17
AI Technical Summary
In the existing technology, the vehicle controller needs to control the switching of the NMOS transistor through an integrated gate boost chip, which results in high hardware cost and slow response speed, and cannot protect the load in time under overcurrent conditions.
A voltage conversion circuit is used to boost the preset power supply and provide it to the control terminal of the NMOS transistor through a controllable switching unit to turn it on. Combined with a voltage clamping and overcurrent detection unit, the NMOS transistor is protected to avoid damage.
It reduces hardware circuit costs, improves response speed and protection effect, and avoids damage to NMOS transistors and loads.
Smart Images
Figure CN223786039U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronic circuits, and in particular to a control circuit of a switching tube, a controller and a vehicle. BACKGROUND
[0002] A vehicle controller needs to control multiple loads, and some loads need a large direct current. Therefore, the vehicle controller needs to control a switching tube that can pass a large current, such as an NMOS (N-Metal-Oxide-Semiconductor). The voltage range of a low-voltage 24V system of a whole vehicle system is 16V-32V. In order to turn on the NMOS tube, the gate voltage of the NMOS tube needs to reach 42V or above. In the related art, an integrated gate boost chip is usually used to control the switching of the NMOS tube. The output voltage of the gate boost chip is the supply voltage of the gate boost chip plus 12V. Therefore, in the low-voltage supply voltage range of 16V-32V, the output voltage of the gate boost chip is between 28V-44V. However, the cost of the gate boost chip is relatively high, which increases the hardware cost of the vehicle controller. SUMMARY
[0003] The present application relates to the technical field of electronic circuits, and in particular to a control circuit of a switching tube, a controller and a vehicle.
[0004] The second purpose of the present application is to provide a controller.
[0005] The third purpose of the present application is to provide a vehicle.
[0006] To achieve the above purposes, according to the first aspect of the present application, a control circuit of a switching tube is provided. The first end of the switching tube is adapted to input a preset power supply. The second end of the switching tube is adapted to be connected to a load. The control circuit comprises: a voltage conversion unit, the input end of the voltage conversion unit is adapted to input the preset power supply, and the voltage conversion unit is configured to boost and convert the preset power supply to generate a first power supply; a controllable switching unit, the input end of the controllable switching unit is connected to the output end of the voltage conversion unit, the output end of the controllable switching unit is adapted to be connected to the control end of the switching tube, the control end of the controllable switching unit is adapted to be connected to the second end of the switching tube, and the controllable switching unit is configured to provide the first power supply to the control end of the switching tube to turn on the switching tube when receiving a control signal, and to control the switching tube to remain in the on state according to the power provided by the switching tube when the switching tube is turned on.
[0007] The control circuit of the switch tube according to the embodiment of the utility model, including voltage conversion unit and controllable switch unit, wherein, the input end of voltage conversion unit is suitable for inputting preset power supply, voltage conversion unit is configured to boost conversion to preset power supply, to generate first power supply, the output end of voltage conversion unit is connected with controllable switch unit, the input end of controllable switch unit is suitable for connecting the control end of switch tube, the control end of controllable switch unit is suitable for connecting the second end of switch tube, controllable switch unit is configured to provide first power supply to the control end of switch tube under the condition of receiving control signal, to make switch tube open, and under the condition of switch tube open, according to the electric energy provided by switch tube, control switch tube to keep open state. Thus, through voltage conversion circuit, preset power supply is boosted to meet the opening voltage of the control end of switch tube, and is provided to the control end of switch tube through controllable switch unit, to make switch tube open, without gate voltage boost chip, thereby reducing the cost of hardware circuit.
[0008] According to an embodiment of the utility model, the controllable switch unit includes: a first switch tube, the control end of the first switch tube is suitable for inputting a control signal and is suitable for being connected to the second end of the switch tube through a first resistor, the second end of the first switch tube is grounded, and the first switch tube is configured to open under the condition of receiving the control signal or receiving the electric energy provided by the switch tube; a second resistor, one end of the second resistor is connected to the first end of the first switch tube; a second switch tube, the control end of the second switch tube is connected to the other end of the second resistor, and the first end of the second switch tube is connected to the output end of the voltage conversion unit; and a third resistor, one end of the third resistor is connected to the second end of the second switch tube, and the other end of the third resistor is suitable for connecting the control end of the switch tube.
[0009] According to an embodiment of the utility model, the first switch tube is NMOS, and the second switch tube is PMOS.
[0010] According to an embodiment of the utility model, the control circuit further includes: a voltage clamping unit, one end of the voltage clamping unit is suitable for connecting the second end of the switch tube, the other end of the voltage clamping unit is suitable for connecting the control end of the switch tube, and the voltage clamping unit is configured to clamp the voltage between the second end and the control end of the switch tube to a preset voltage under the condition of switch tube opening, wherein the preset voltage is greater than the turn-on voltage of the switch tube and less than a preset voltage threshold.
[0011] According to an embodiment of the utility model, the voltage clamping unit includes a zener diode, the anode of the zener diode is suitable for connecting the second end of the switch tube, and the cathode of the zener diode is suitable for connecting the control end of the switch tube, wherein the rated voltage of the zener diode is the preset voltage.
[0012] According to one embodiment of the utility model, control circuit still include: overcurrent detection unit, overcurrent detection unit's input end is suitable for connecting switch tube's second end, overcurrent detection unit's output end is connected with controllable switch unit's control end, overcurrent detection unit is configured to under the condition of detecting that the output current of switch tube is greater than preset current threshold, sends the shutdown signal to controllable switch unit, to make controllable switch unit shutdown.
[0013] According to one embodiment of the utility model, overcurrent detection unit includes: current detection module, is suitable for connecting switch tube's second end, to detect the output current of switch tube, obtains current detection value;Overcurrent comparison module, overcurrent comparison module is connected with current detection module, to generate shutdown signal under the condition of current detection value greater than preset current threshold.
[0014] According to one embodiment of the utility model, control circuit still include: control unit, control unit's input end is connected with current detection module, control unit's output end is connected with controllable switch unit's control end, control unit is configured to under the condition of current detection value greater than preset current threshold, control controllable switch unit shutdown.
[0015] To achieve the above object, according to the second aspect embodiment of the utility model proposes a kind of controller, including the control circuit of switch tube of any preceding embodiment.
[0016] According to the controller of the utility model embodiment, by using the control circuit described above, the preset power supply is boosted by voltage conversion circuit, to meet the opening voltage of the control end of switch tube, and the control end of switch tube is provided by controllable switch unit, to make switch tube open, without gate voltage boosting chip, so as to reduce hardware circuit cost.
[0017] To achieve the above object, according to the third aspect embodiment of the utility model proposes a kind of vehicle, including: switch tube and load, the first end of switch tube is suitable for input preset power supply, the second end of switch tube is connected with load;The controller described above, controller is connected with the control end of switch tube, controller is configured to switch control switch tube, to power load.
[0018] According to the vehicle of the utility model embodiment, by using the controller described above, the preset power supply is boosted by voltage conversion circuit, to meet the opening voltage of the control end of switch tube, and the control end of switch tube is provided by controllable switch unit, to make switch tube open, without gate voltage boosting chip, so as to reduce hardware circuit cost.
[0019] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a structural schematic diagram of an NMOS tube in the related art;
[0021] Figure 2 is a circuit diagram of a control circuit of an NMOS tube in the related art;
[0022] Figure 3 is a structural schematic diagram of a control circuit of a switch tube according to one embodiment of the present application;
[0023] Figure 4 is a circuit diagram of a controllable switch unit according to one embodiment of the present application;
[0024] Figure 5 is a circuit diagram of a voltage clamping unit according to one embodiment of the present application;
[0025] Figure 6 is a structural schematic diagram of an overcurrent detection unit according to one embodiment of the present application;
[0026] Figure 7 is a structural schematic diagram of a controller according to one embodiment of the present application;
[0027] Figure 8 is a structural schematic diagram of a vehicle according to one embodiment of the present application. DETAILED DESCRIPTION
[0028] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0029] It should be noted that the present application is made by the inventor's understanding and research on the following problems:
[0030] Under the high-voltage 800V architecture, the voltage range of the low-voltage 24V system of the vehicle system is 16-32V. Therefore, the output voltage of the NMOS tube also needs to reach 32V. The structure of the NMOS tube is shown in Figure 1 The turn-on condition of the NMOS tube is that the gate G voltage needs to be higher than the source S voltage. When the gate G voltage is greater than the sum of the source S voltage and a preset threshold value, the NMOS tube is turned on, and the preset threshold value is the threshold voltage of the NMOS tube. The threshold voltage is determined according to the type of MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, and the threshold voltage is usually between 5V-10V.
[0031] After a MOSFET is turned on, its drain and source voltages are almost identical. Therefore, to ensure the MOSFET remains on, the gate voltage of an NMOS transistor needs to be at least 10V higher than its source voltage. In a vehicle's low-voltage 24V system, the input voltage range of a MOSFET is between 16V and 32V. Therefore, the gate voltage of an NMOS transistor needs to be designed to reach at least 42V.
[0032] In related technologies, such as Figure 2 As shown, the NMOS transistor is typically switched using an integrated gate boost converter chip 1 (e.g., the LT1910 from Analog Devices). The gate boost converter chip 1 operates on a supply voltage of 8V-48V, and its GATE pin outputs a voltage equal to the supply voltage plus 12V. Within a low supply voltage range of 16V-32V, the output voltage of the GATE pin can reach 28V-44V. The NMOS transistor can then be controlled by adjusting the IN pin of the gate boost converter chip 1.
[0033] However, the price of a single integrated gate boost chip 1 reaches 30 yuan. Therefore, the hardware cost of the circuit scheme in related technologies is high, leading to increasingly higher costs for vehicles and controllers. Furthermore, the hardware current detection in the related technologies is slow. When a short circuit causes overcurrent, the fault is first transmitted back to the MCU (Microcontroller Unit) via the FAULT pin of the gate boost chip 1. The MCU then sends a shutdown command to the gate boost chip 1, which controls the NMOS transistor to turn off according to the shutdown command. In cases where the controller has multiple loads, the MCU's acquisition speed of the ADC (Analog-to-Digital Converter) is slow, with a response time in milliseconds. Therefore, it cannot immediately shut down the NMOS transistor in the short time following an overcurrent event, potentially damaging the MOS transistor or the load.
[0034] Based on this, embodiments of the present invention provide a control circuit for a switching transistor, a controller, and a vehicle. The preset power supply is boosted by a voltage conversion circuit to meet the turn-on voltage of the control terminal of the switching transistor, and the voltage is provided to the control terminal of the switching transistor through a controllable switching unit to turn on the switching transistor. No gate boost chip is required, thereby reducing the cost of the hardware circuit.
[0035] The control circuit, controller, and vehicle of the switching transistor according to embodiments of the present invention are described below with reference to the accompanying drawings.
[0036] Figure 3It is a structural schematic diagram of the control circuit of the switch tube according to an embodiment of the utility model. As shown in the figure, Figure 3 The first end of the switch tube Q is adapted to input a preset power supply, and the second end of the switch tube Q is adapted to be connected to a load 200. The control circuit 100 comprises a voltage conversion unit 10 and a controllable switch unit 20.
[0037] The input end of the voltage conversion unit 10 is adapted to input the preset power supply, and the voltage conversion unit 10 is configured to perform step-up conversion on the preset power supply to generate a first power supply. The input end of the controllable switch unit 20 is connected to the output end of the voltage conversion unit 10, the output end of the controllable switch unit 20 is adapted to be connected to the control end of the switch tube Q, the control end of the controllable switch unit 20 is adapted to be connected to the second end of the switch tube Q, and the controllable switch unit 20 is configured to, in the case of receiving a control signal, provide the first power supply to the control end of the switch tube Q to turn on the switch tube Q, and in the case of turning on the switch tube Q, control the switch tube Q to remain in the turned-on state according to the electric energy provided by the switch tube Q.
[0038] Specifically, the switch tube Q can be an NMOS tube, the first end of the switch tube Q is the drain of the switch tube Q, and the second end of the switch tube Q is the source of the switch tube Q. After the switch tube Q is turned on, the source voltage of the switch tube Q is the voltage of the preset power supply. The voltage conversion unit 10 performs step-up conversion on the preset power supply to obtain the first power supply, and the difference between the voltage of the first power supply and the voltage of the preset power supply is greater than the threshold voltage of the switch tube Q. The voltage conversion unit 10 can be a voltage conversion chip. After the control end of the controllable switch unit 20 receives the control signal, the controllable switch unit 20 is turned on, and the first power supply can be provided to the gate of the switch tube Q, so that the switch tube Q is turned on. After the switch tube Q is turned on, the current can be output to the load 200. Because the source of the switch tube Q is also connected to the control end of the controllable switch unit 20, the switch tube Q can also output current to the control end of the controllable switch unit 20, so that the controllable switch unit 20 remains in the turned-on state. The controllable switch unit 20 can continuously provide the first power supply to the gate of the switch tube Q, so that the switch tube Q remains in the turned-on state.
[0039] It should be noted that, in the case of meeting the output current capability, the on-resistance of the switch tube Q needs to be as small as possible to reduce power loss.
[0040] In the above embodiment, the preset power supply is stepped up by the voltage conversion circuit to meet the turn-on voltage of the control end of the switch tube, and the controllable switch unit is provided to the control end of the switch tube to turn on the switch tube, so that the gate step-up chip is not needed, thereby reducing the hardware circuit cost. When the switch tube is turned off, only one control signal needs to be sent to turn on the controllable switch unit, and then the controllable switch unit can remain in the on state according to the current output by the switch tube, thereby reducing the consumption of the controller.
[0041] In some embodiments, such as Figure 4 As shown, the controllable switching unit 20 includes: a first switching transistor Q1, a second resistor R2, a second switching transistor Q2, and a third resistor R3. The control terminal of the first switching transistor Q1 is adapted to receive a control signal and is adapted to be connected to the second terminal of the switching transistor Q through the first resistor R1. The second terminal of the first switching transistor Q1 is grounded. The first switching transistor Q1 is configured to turn on when it receives a control signal or receives electrical energy provided by the switching transistor Q. One end of the second resistor R2 is connected to the first terminal of the first switching transistor Q1. The control terminal of the second switching transistor Q2 is connected to the other end of the second resistor R2. The first terminal of the second switching transistor Q2 is connected to the output terminal of the voltage conversion unit 10. One end of the third resistor R3 is connected to the second terminal of the second switching transistor Q2. The other end of the third resistor R3 is adapted to be connected to the control terminal of the switching transistor Q.
[0042] Specifically, the first switch Q1 turns on upon receiving a control signal or electrical energy supplied by the second switch Q, thereby turning on the second switch Q2. After the second switch Q2 turns on, the first power supply flows from the first terminal of the second switch Q2 through the third resistor R3 to the control terminal of the second switch Q, thus turning on the second switch Q. After the second switch Q turns on, current flows through the first resistor R1 to the first switch Q1, keeping the first switch Q1 on, which in turn keeps the second switch Q2 on, thus ensuring that the second switch Q remains on continuously.
[0043] Optional, such as Figure 4 As shown, the first switch Q1 is an NMOS and the second switch Q2 is a PMOS (P-Metal-Oxide-Semiconductor).
[0044] Specifically, the control signal can be a high-level signal. Upon receiving the control signal, the control terminal of the first switch Q1 is turned on, and the control terminal of the second switch Q2 is pulled low through the second resistor R2, thus turning on the second switch Q2. The first power supply flows to the control terminal of the switch Q through the third resistor R3, thereby turning on the switch Q. After the switch Q is turned on, current flows through the first resistor R1 to the control terminal of the first switch Q1, keeping the first switch Q1 on. The control terminal of the second switch Q2 continues to be pulled low through the second resistor R2, keeping the second switch Q2 on, so that the first power supply continues to flow to the control terminal of the switch Q, keeping the switch Q on.
[0045] It should be noted that since the first switch Q1 operates based on a control signal with a relatively small amplitude, the second switch Q2 can be a switch Q with a smaller turn-on voltage.
[0046] In some embodiments, such asFigure 5 As shown, the control circuit 100 further comprises a voltage clamping unit 30, one end of the voltage clamping unit 30 is adapted to be connected to the second end of the switch tube Q, the other end of the voltage clamping unit 30 is adapted to be connected to the control end of the switch tube Q, and the voltage clamping unit 30 is configured to clamp the voltage between the second end and the control end of the switch tube Q to a preset voltage when the switch tube Q is turned on, wherein the preset voltage is greater than the turn-on voltage of the switch tube Q and less than a preset voltage threshold.
[0047] Specifically, the voltage conversion unit 10 generates a voltage difference between the first power supply and the preset power supply, which may exceed the threshold voltage of the switch tube Q, thereby causing damage to the switch tube Q. Therefore, the voltage clamping unit 30 is needed to clamp the voltage between the second end and the control end of the switch tube Q to avoid the voltage between the second end and the control end of the switch tube Q exceeding the threshold voltage. After the switch tube Q is turned on, the voltage clamping unit 30 starts to work to clamp the voltage between the second end and the control end of the switch tube Q to a preset voltage, which is greater than the turn-on voltage of the switch tube Q and less than a preset voltage threshold.
[0048] For example, assuming that the preset power supply is 24V and the preset voltage threshold is 20V, the voltage conversion unit 10 can boost the 24V voltage to 48V. Therefore, the voltage difference between the first power supply (48V) and the preset power supply (24V) is 24V. If there is no voltage clamping unit 30 to clamp, the voltage between the second end and the control end of the switch tube Q will always exceed the preset voltage threshold, thereby causing damage to the switch tube Q. Therefore, the voltage clamping unit 30 is needed to clamp the voltage between the second end and the control end of the switch tube Q, and the preset voltage can be 13V, which not only keeps the switch tube Q in the on state, but also does not exceed the preset voltage threshold.
[0049] Further, in some embodiments, as shown in Figure 5 The voltage clamping unit 30 comprises a voltage stabilizing diode ZD, the anode of the voltage stabilizing diode ZD is adapted to be connected to the second end of the switch tube Q, and the cathode of the voltage stabilizing diode ZD is adapted to be connected to the control end of the switch tube Q, wherein the rated voltage of the voltage stabilizing diode ZD is the preset voltage.
[0050] That is, a voltage stabilizing diode ZD with a rated voltage equal to the preset voltage can be selected. After the switch tube Q is turned on, the voltage stabilizing diode ZD is turned on to clamp the voltage between the second end and the control end of the switch tube Q to the preset voltage.
[0051] In the above embodiments, the voltage clamping unit can clamp the voltage between the second end and the control end of the switch tube, thereby avoiding the voltage difference between the second end and the control end of the switch tube being too large, causing damage to the switch tube, and further improving the reliability of the controller.
[0052] In some embodiments, as shown in Figure 6 The control circuit 100 further includes an overcurrent detection unit 40, an input end of the overcurrent detection unit 40 being adapted to be connected to the second end of the switch tube Q, and an output end of the overcurrent detection unit 40 being connected to the control end of the controllable switch unit 20. The overcurrent detection unit 40 is configured to send an off signal to the controllable switch unit 20 to make the controllable switch unit 20 off, when detecting that the output current of the switch tube Q is greater than a preset current threshold.
[0053] Specifically, when the switch tube Q is in the on state, the current in the circuit can suddenly increase due to abnormal conditions. If there is no overcurrent protection in the circuit, the switch tube Q will be burned out due to rapid heating, thereby causing the circuit board to be damaged. The overcurrent detection unit 40 can detect the output current of the switch tube Q. When it is detected that the output current of the switch tube Q is greater than the preset current threshold, it indicates that an overcurrent fault occurs in the circuit. Therefore, an off signal is sent to the controllable switch unit 20. The controllable switch unit 20 is off after receiving the off signal. After the controllable switch unit 20 is off, the first power supply cannot be provided to the control end of the switch tube Q, so the switch tube Q is off.
[0054] In some embodiments, as shown in Figure 6 The overcurrent detection unit 40 includes a current detection module 41 and an overcurrent comparison module 42. The current detection module 41 is adapted to be connected to the second end of the switch tube Q to detect the output current of the switch tube Q to obtain a current detection value. The overcurrent comparison module 42 is connected to the current detection module 41 to generate an off signal when the current detection value is greater than a preset current threshold.
[0055] Specifically, the current detection module 41 is connected in series to the second end of the switch tube Q to detect the output current of the switch tube Q to obtain a current detection value. The overcurrent comparison module 42 compares the current detection value with the preset current threshold. When the current detection value is greater than the preset current threshold, an off signal is output. The off signal can be a low-level signal. After the first switch tube Q1 receives the off signal, the first switch tube Q1 is off, thereby making the second switch tube Q2 off. After the second switch tube Q2 is off, the switch tube Q is off.
[0056] It should be noted that the current detection module 41 can adopt a current detection scheme in the related art, for example, using a resistor to sample the current, or using a mutual inductor to sample the current, which is not limited here.
[0057] In the above embodiments, the overcurrent protection is performed in the manner of hardware protection. The speed of the hardware protection is faster, which can turn off the switch tube in microseconds, thereby accelerating the protection speed when the overcurrent occurs, so as to avoid the switch tube from being damaged, and further improve the reliability of the controller.
[0058] In some embodiments, as shown in Figure 6 The control circuit 100 further comprises a control unit 50, an input end of the control unit 50 being connected with the current detection module 41, and an output end of the control unit 50 being connected with the control end of the controllable switch unit 20, and the control unit 50 is configured to control the controllable switch unit 20 to be turned off when the current detection value is greater than the preset current threshold.
[0059] It can be understood that the control circuit 100 of the embodiment can also use the control end unit for software overcurrent protection, the control unit 50 acquires the current detected by the current detection module 41, and compares the current detection value with the preset current threshold, and outputs a low-level signal to the first switch tube Q1 to make the first switch tube Q1 turn off when the current detection value is greater than the preset current threshold, so as to make the second switch tube Q2 and the switch tube Q turn off.
[0060] In an alternative embodiment, the control unit 50 is further connected with the control end of the controllable switch unit 20 to output a control signal to the control end of the controllable switch unit 20, and the control signal can be 500us, and after the control unit 50 outputs the control signal, the channel of the control unit 50 becomes a high resistance state and no longer outputs a high level.
[0061] In summary, the control circuit of the switch tube according to the embodiment of the utility model, including voltage conversion unit and controllable switch unit, wherein, voltage conversion unit's input end is suitable for input preset power supply, voltage conversion unit is configured to boost conversion to preset power supply, to generate first power supply, controllable switch unit's input end is connected with voltage conversion unit's output end, controllable switch unit's output end is suitable for connecting switch tube's control end, controllable switch unit's control end is suitable for connecting switch tube's second end, controllable switch unit is configured to provide first power supply to switch tube's control end under the condition of receiving control signal, to make switch tube open, and under the condition of switch tube open, according to the electric energy provided by switch tube, control switch tube to keep open state. Thus, the preset power supply is boosted by the voltage conversion circuit to meet the opening voltage of the control end of the switch tube, and the control end of the switch tube is provided by the controllable switch unit to make the switch tube open, without the need for a gate voltage boosting chip, thereby reducing the hardware circuit cost.
[0062] Corresponding to the above embodiment, the embodiment of the utility model further proposes a controller. As shown in Figure 7 The controller 300 comprises the control circuit 100 of the switch tube of any one of the foregoing embodiments.
[0063] According to the controller of the embodiment of the present application, the preset power supply is boosted through the voltage conversion circuit to meet the opening voltage of the control end of the switch tube, and the control end of the switch tube is provided with the controllable switch unit to make the switch tube open, and the gate voltage boosting chip is not needed, thereby reducing the hardware circuit cost.
[0064] Corresponding to the above embodiment, the embodiment of the present application also provides a vehicle. Figure 8 As shown in the figure, the vehicle comprises a switch tube Q, a load 200 and the aforementioned controller 300, wherein the first end of the switch tube Q is adapted to input a preset power supply, the second end of the switch tube Q is connected with the load 200; the controller 300 is connected with the control end of the switch tube Q, and the controller 300 is configured to switch control the switch tube Q to supply power to the load 200.
[0065] According to the vehicle of the embodiment of the present application, the preset power supply is boosted through the voltage conversion circuit to meet the opening voltage of the control end of the switch tube, and the control end of the switch tube is provided with the controllable switch unit to make the switch tube open, and the gate voltage boosting chip is not needed, thereby reducing the hardware circuit cost.
[0066] It should be understood that the parts of the present application can be realized by hardware, software, firmware or their combination. In the above-mentioned embodiments, the plurality of steps or methods can be realized by software or firmware stored in the memory and executed by the appropriate instruction execution system. For example, if realized by hardware, and as in another embodiment, it can be realized by any one or their combination of the following technologies known in the art: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with appropriate combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.
[0067] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0068] In addition, the terms "first", "second" and the like in the embodiments of the present application are used only for the purpose of description, and can not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined by the terms "first", "second" and the like in the embodiments of the present application can be explicitly or implicitly indicated to include at least one of the features in the embodiments. In the description of the present application, the meaning of the word "multiple" is at least two or two or more, for example, two, three, four, etc., unless otherwise specifically limited in the embodiments.
[0069] In the present application, unless otherwise specifically provided or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection, or integrated, which can be understood, or mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.
[0070] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A control circuit for a switching transistor, characterized by The first end of the switch tube is adapted to input a preset power supply, and the second end of the switch tube is adapted to be connected to a load. The control circuit comprises: a voltage conversion unit, an input end of the voltage conversion unit being adapted to input the preset power supply, the voltage conversion unit being configured to perform step-up conversion on the preset power supply to generate a first power supply; a controllable switch unit, an input end of the controllable switch unit being connected to an output end of the voltage conversion unit, an output end of the controllable switch unit being adapted to be connected to a control end of the switch tube, a control end of the controllable switch unit being adapted to be connected to the second end of the switch tube, the controllable switch unit being configured to, in the case of receiving a control signal, provide the first power supply to the control end of the switch tube to turn on the switch tube, and in the case of turning on the switch tube, control the switch tube to remain in the turned-on state according to the electrical energy provided by the switch tube.
2. The control circuit of claim 1, wherein, The controllable switch unit comprises: a first switch tube, a control end of the first switch tube being adapted to input the control signal and being adapted to be connected to the second end of the switch tube through a first resistor, a second end of the first switch tube being grounded, the first switch tube being configured to be turned on in the case of receiving the control signal or receiving the electrical energy provided by the switch tube; a second resistor, one end of the second resistor being connected to the first end of the first switch tube; a second switch tube, a control end of the second switch tube being connected to the other end of the second resistor, a first end of the second switch tube being connected to the output end of the voltage conversion unit; a third resistor, one end of the third resistor being connected to a second end of the second switch tube, the other end of the third resistor being adapted to be connected to the control end of the switch tube.
3. The control circuit of claim 2, wherein, The first switch tube is an NMOS, and the second switch tube is a PMOS.
4. The control circuit of claim 1, wherein Further comprising: a voltage clamping unit, one end of the voltage clamping unit being adapted to be connected to the second end of the switch tube, the other end of the voltage clamping unit being adapted to be connected to the control end of the switch tube, the voltage clamping unit being configured to clamp the voltage between the second end and the control end of the switch tube to a preset voltage in the case of turning on the switch tube, wherein the preset voltage is greater than a turn-on voltage of the switch tube and less than a preset voltage threshold.
5. The control circuit of claim 4, wherein, The voltage clamping unit comprises a zener diode, an anode of the zener diode being adapted to be connected to the second end of the switch tube, and a cathode of the zener diode being adapted to be connected to the control end of the switch tube, wherein a rated voltage of the zener diode is the preset voltage.
6. The control circuit of any one of claims 1-5, wherein, Further comprising: an overcurrent detection unit, an input end of the overcurrent detection unit being adapted to be connected to the second end of the switch tube, an output end of the overcurrent detection unit being connected to the control end of the controllable switch unit, the overcurrent detection unit being configured to, in the case of detecting that an output current of the switch tube is greater than a preset current threshold, send an off signal to the controllable switch unit to turn off the controllable switch unit.
7. The control circuit of claim 6, wherein, The overcurrent detection unit comprises: a current detection module, adapted to be connected to the second end of the switch tube to detect the output current of the switch tube to obtain a current detection value; An overcurrent comparison module connected with the current detection module to generate the off signal when the current detection value is greater than the preset current threshold.
8. The control circuit of claim 7, wherein, Also comprising: A control unit with an input connected with the current detection module and an output connected with the control terminal of the controllable switch unit, configured to control the controllable switch unit to off when the current detection value is greater than the preset current threshold.
9. A controller characterized by comprising: A control circuit comprising the switch tube according to any one of claims 1-8.
10. A vehicle characterized by comprising: Comprising: A switch tube with a first end adapted to input a preset power supply and a second end connected with a load; A controller according to claim 9 connected with the control terminal of the switch tube, configured to switch control the switch tube to supply power to the load.