Control device of power supply loop and vehicle

Abstract

The invention relates to a control device of a power supply loop and a vehicle. The device comprises a power switch tube module which is connected in series with a power supply loop and is configured to connect or disconnect the power supply loop; the input end of the protection module is connected with the power switch tube module, and the protection module is configured to output a protection signal when detecting that the terminal voltage of the power switch tube module is in a saturation voltage retreating stage; the output end of the first driving module is connected with the power switch tube module, and the first driving module is configured to output a first driving signal to drive the power switch tube module to be switched on; the second driving module is connected with the output end of the protection module, the power switch tube module and the output end of the first driving module, and is configured to output a second driving signal based on the protection signal to drive the power switch tube module to be switched off; therefore, the control device of the power supply loop is low in cost and small in occupied space volume.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a control device for a power supply circuit and a vehicle. Background Art

[0002] The power system of an electric vehicle primarily consists of a power battery, a low-voltage storage battery, a charging system, an energy management system, and related control circuits and connection lines. The power battery generally powers the vehicle's drive motor and other high-voltage equipment, while the low-voltage storage battery generally powers the vehicle's low-voltage equipment.

[0003] In the related art, in a high-voltage power supply circuit in which a power battery supplies power to a high-voltage device, a relay is used to control the on / off of the circuit, and a fuse or a circuit breaker is used to implement overcurrent protection of the circuit.

[0004] However, the solutions for on-off control and overcurrent protection of high-voltage power supply circuits in related technologies have the problems of high cost and large space occupied. Summary of the Invention

[0005] Based on this, it is necessary to provide a control device and a vehicle for a power supply circuit that is low in cost and occupies a small space.

[0006] In a first aspect, an embodiment of the present application provides a control device for a power supply circuit, comprising:

[0007] A power switch tube module, the power switch tube module is connected in series to the power supply circuit and is configured to connect or disconnect the power supply circuit;

[0008] a protection module, wherein an input terminal of the protection module is connected to the power switch module and is configured to output a protection signal when detecting that the terminal voltage of the power switch module is in a desaturation voltage stage;

[0009] A first driving module, wherein an output end of the first driving module is connected to the power switch module and is configured to output a first driving signal to drive the power switch module to conduct;

[0010] The second driving module is connected to the output end of the protection module, the power switch module and the output end of the first driving module, and is configured to output a second driving signal based on the protection signal to drive the power switch module to turn off.

[0011] In one embodiment, the protection module includes:

[0012] a voltage conversion unit, wherein a first input terminal of the voltage conversion unit is connected to the first terminal of the power switch tube module, a second input terminal of the voltage conversion unit is connected to the second terminal of the power switch tube module, and the voltage conversion unit is configured to convert the voltage between the first terminal and the second terminal of the power switch tube module into a single-ended voltage;

[0013] a comparison unit, wherein the input end of the comparison unit is connected to the output end of the voltage conversion unit, the output end of the comparison unit is connected to the second driving module, and is configured to output the protection signal when it is determined that the single-ended voltage is within the reference voltage range corresponding to the desaturation voltage stage, wherein the second driving module is connected to the control end of the power switch tube module and the output end of the first driving module.

[0014] In one embodiment, the comparison unit includes:

[0015] a first comparator, wherein a first input terminal of the first comparator is connected to a first reference voltage terminal, and a second input terminal of the first comparator is connected to an output terminal of the voltage conversion unit;

[0016] a second comparator, wherein a first input terminal of the second comparator is connected to the output terminal of the voltage conversion unit, and a second input terminal of the second comparator is connected to a second reference voltage terminal;

[0017] In which, the output end of the second comparator is connected to the output end of the first comparator, and the connection point serves as the output end of the comparison unit, and the connection point is connected to a preset power supply through a first resistance sub-unit; the first reference voltage of the first reference voltage end is greater than the second reference voltage of the second reference voltage end, and the comparison unit is configured to output the protection signal when the single-ended voltage is less than the first reference voltage and greater than the second reference voltage.

[0018] In one embodiment, the second driving module includes:

[0019] A switch unit is connected to the output end of the protection module, the power switch tube module and the output end of the first drive module, and is configured to be turned on based on the protection signal to output the second drive signal to drive the power switch tube module to be turned off.

[0020] In one embodiment, the switch unit includes:

[0021] A controllable switch, wherein a first end of the controllable switch is grounded, a second end of the controllable switch is connected to the output end of the power switch tube module and the first driving module, and a control end of the controllable switch is connected to the output end of the protection module, and is configured to be turned on based on the protection signal to output the second driving signal.

[0022] In one embodiment, the second driving module further includes:

[0023] A delay unit, wherein the switch unit is connected to the output end of the protection module via the delay unit;

[0024] The protection module is further configured to output a shutdown signal when detecting that the terminal voltage of the power switch module is not in the desaturation voltage stage;

[0025] The switch unit is further configured to be turned off based on the turn-off signal;

[0026] The delay unit is configured to: when the shutdown signal, the protection signal and the shutdown signal are received in sequence within a preset time period, filter out the protection signal within the preset time period, wherein the preset time period is equal to the time required for the power switch tube module to be normally turned on, or the preset time period is equal to the time required for the power switch tube module to be normally turned off.

[0027] In one embodiment, the first driving module is further connected to the output end of the protection module, and is configured to output a third driving signal to drive the power switch module to turn off when the number of times the protection signal is continuously received is greater than a first preset number.

[0028] In one embodiment, it further includes:

[0029] A signal isolation module is provided between the output end of the protection module and the first driving module.

[0030] In one embodiment, it further includes:

[0031] a temperature detection module, configured to detect the module temperature of the power switch tube module;

[0032] The first driving module is also connected to the temperature detection module and is configured to output the first driving signal again to drive the power switch tube module to turn on if the difference between the module temperature and the reference temperature is less than a preset threshold after outputting the third driving signal to drive the power switch tube module to turn off.

[0033] In one embodiment, the first driving module is further configured to stop driving the power switch module if the number of times the third driving signal is output is greater than a second preset number after the first driving signal is re-output to drive the power switch module to turn on.

[0034] In one embodiment, it further includes:

[0035] a temperature detection module, configured to detect the module temperature of the power switch tube module;

[0036] The first driving module is also connected to the temperature detection module, and is configured to output a fourth driving signal to drive the power switch module to turn off when the difference between the module temperature and the reference temperature is greater than a preset threshold.

[0037] In one embodiment, the first driving module is further configured to output the first driving signal again to drive the power switch tube module to turn on after outputting the fourth driving signal to drive the power switch tube module to turn off, and stop driving the power switch tube module if the difference between the module temperature and the reference temperature is still greater than a preset threshold.

[0038] In a second aspect, an embodiment of the present application further provides a vehicle, comprising a power supply, a load, and a control device for the power supply circuit as described in the first aspect above; the power supply is connected to a first end of a power switch tube module in the control device of the power supply circuit, and the load is connected to a second end of the power switch tube module.

[0039] The control device and vehicle of the above-mentioned power supply circuit are characterized by connecting a power switch tube module in series in the power supply circuit, and the conduction or shutdown of the power switch tube module can be controlled by the first driving module to realize normal on-off control of the power supply circuit, wherein the first driving module can output a first driving signal to drive the power switch tube module to conduct; and when the protection module detects that the terminal voltage of the power switch tube module is in the desaturation voltage stage, it can be determined that the power supply circuit is overcurrent, and the protection module outputs a protection signal to the second driving module, so that the second driving module outputs a second driving signal based on the protection signal to drive the power switch tube module to shut down, thereby realizing overcurrent protection of the power supply circuit; therefore, the solution of the embodiment of the present application adopts the power switch tube module to realize both the on-off control and overcurrent protection of the power supply circuit, which greatly reduces the cost and the occupied space volume compared with the related art that adopts relays and fuses. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 This is a schematic diagram of the structure of a control device for a power supply circuit according to an embodiment;

[0042] Figure 2This is a second structural diagram of a control device for a power supply circuit according to an embodiment;

[0043] Figure 3 is a schematic structural diagram of a comparison unit according to an embodiment;

[0044] Figure 4 This is a third structural diagram of a control device for a power supply circuit according to an embodiment;

[0045] Figure 5 This is a fourth structural diagram of a control device for a power supply circuit according to an embodiment;

[0046] Figure 6 This is a fifth structural diagram of a control device for a power supply circuit according to an embodiment;

[0047] Figure 7 This is a sixth structural diagram of a control device for a power supply circuit according to an embodiment;

[0048] Figure 8 This is a seventh structural diagram of a control device for a power supply circuit according to an embodiment;

[0049] Figure 9 This is a schematic diagram of temperature changes of a power switch tube module according to an embodiment;

[0050] Figure 10 This is an eighth structural diagram of a control device for a power supply circuit according to an embodiment.

[0051] Explanation of the accompanying drawings: 10-power switch tube module, 20-protection module, 30-first drive module, 40 second drive module, 210-comparison unit, 220-voltage conversion unit, 410-switch unit, 420-delay unit, U1-first comparator, U2-second comparator, 50-signal isolation module, 60-temperature detection module, Q1-insulated gate bipolar transistor, Vref1-first reference voltage signal, Vref2-second reference voltage signal, SW-protection signal, T_max-preset temperature threshold, T_ref-reference temperature, Vcc-preset power supply. DETAILED DESCRIPTION

[0052] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0054] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0055] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0056] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0057] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0058] In an exemplary embodiment, referring to Figure 1 , provides a control device 1 for a power supply circuit, which includes a power switch tube module 10, a protection module 20, a first drive module 30 and a second drive module 40.

[0059] The power switch module 10 is connected in series to the power supply circuit and is configured to connect or disconnect the power supply circuit. The power switch module 10 may include at least one power switch. If the power switch module 10 includes multiple power switches, the multiple power switches may be, but are not limited to, connected in parallel. The first end of each power switch connected in parallel serves as the first end of the power switch module 10, the second end of each power switch connected in parallel serves as the second end of the power switch module 10, and the control end of each power switch connected in parallel serves as the control end of the power switch module 10. The operating states of each power switch in the power switch module 10 may be synchronized. Examples of power switches include, but are not limited to, IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metal Oxide Semiconductor Field Effect Transistors).

[0060] The power supply, the power switch module 10, and the load are connected in series to form a power supply circuit. For example, the power supply can be a power battery or a low-voltage battery in an electric vehicle, and the load can be a high-voltage device or a low-voltage device in the electric vehicle that needs to be powered. Of course, the power supply can also be a power supply in other practical application scenarios, and the load can be a load in other corresponding practical application scenarios. As long as the on-off control of the circuit and the overcurrent protection of the circuit need to be performed, the power supply circuit control device 1 of the embodiment of the present application can be applied.

[0061] The output end of the first driver module 30 is connected to the power switch module 10. Specifically, the output end of the first driver module 30 can be connected to the control end of the power switch module 10. The first driver module 30 has the capability and function of driving the power switch module and is primarily used to drive the power switch module 10. The first driver module 30 can receive externally transmitted drive instructions and, based on the drive instructions, output a drive signal from the output end of the first driver module 30 to drive the power switch module 10, for example, to turn the power switch module 10 on or off. Exemplarily, the first driver module 30 can be configured to output a first drive signal to turn the power switch module 10 on. Exemplarily, the first drive signal is a high level. Exemplarily, the first driver module 30 can be comprised of electronic components such as an MCU (Microcontroller Unit) and a driver chip. The MCU receives externally transmitted drive instructions, outputs a control signal based on the drive instructions, and the driver chip outputs a drive signal based on the control signal to drive the power switch module 10.

[0062] When the first driver module 30 drives the power switch module 10 to turn on, the power supply circuit is connected (i.e., connected), and the power supply normally supplies power to the load. When the first driver module 30 drives the power switch module 10 to turn off, the power supply circuit is disconnected, and the power supply cannot supply power to the load. Thus, the first driver module 30 controls the power switch module 10 to turn on or off, thereby achieving on-off control of the power supply circuit. In other words, normal on-off control of the circuit can be achieved by turning the power switch module 10 on or off, and the normal on-off or normal off-off of the power switch module 10 can be driven by the first driver module 30. Of course, in other embodiments, the normal off-off of the power switch module 10 can also be driven by other power electronic devices, and this embodiment of the present application is not limited to this.

[0063] A power switch has a cutoff phase, a saturated conduction phase, and a desaturation phase. Typically, when a power switch encounters an overcurrent, overload, or instantaneous high current, the power switch enters the desaturation phase. Accordingly, the power switch module 10 has a cutoff phase, a saturated conduction phase, and a desaturation phase. When the power switch module 10 encounters an overcurrent, overload, or instantaneous high current, the power switch module 10 enters the desaturation phase. The terminal voltages of the power switch differ when the power switch is in the cutoff phase, saturated conduction phase, and desaturation phase, respectively. Accordingly, the terminal voltages of the power switch differ when the power switch module 10 is in the cutoff phase, saturated conduction phase, and desaturation phase, respectively.

[0064] The input terminal of the protection module 20 is connected to the power switch module 10. The protection module 20 is configured to output a protection signal SW when it detects that the terminal voltage of the power switch module 10 is in the desaturation voltage stage. The protection module 20 is a hardware circuit and may be composed of electronic components such as a conversion circuit, a resistor, and a comparator. The protection module 20 can detect whether the terminal voltage of the power switch module 10 is in the desaturation voltage stage.

[0065] If it is detected that the terminal voltage of the power switch tube module 10 is not in the desaturation voltage stage, the power switch tube module 10 may be in the cut-off stage or the saturated conduction stage, indicating that the power supply circuit is safe and normal at this time, and the power supply circuit does not have overcurrent, overload or instantaneous high current, etc., and no overcurrent protection is required. Therefore, the protection module 20 does not need to output the protection signal SW, so that the protection module 20 will not interfere with the driving of the first driving module 30. The first driving module 30 continues to drive the power switch tube module 10 to turn on or off normally, that is, the first driving module 30 normally controls the on and off of the circuit.

[0066] If it is detected that the terminal voltage of the power switch tube module 10 is in the desaturation voltage stage, the power switch tube module 10 is in the desaturation stage, indicating that the power supply circuit has overcurrent, overload or instantaneous high current, and the power supply circuit is abnormal and unsafe. The power supply circuit needs to be protected from overcurrent, so the protection module 20 will output a protection signal SW from its own output terminal.

[0067] The second driver module 40 is connected to the output end of the protection module 20, the output end of the first driver module 30, and the power switch module 10. The second driver module 40 is configured to output a second drive signal based on the protection signal SW to drive the power switch module 10 to shut down. Specifically, the second driver module 40 can be connected to the control end of the power switch module 10. The second driver module 40 is a hardware circuit and can be composed of electronic components such as electronic switches. The second driver module 40 can also have the ability and function to drive the power switch, or the second driver module 40 can have the ability and function to output a drive signal for driving the power switch. The drive signal can be a signal that drives the power switch on or off. Based on this, the second driver module 40 outputs a second drive signal based on the protection signal SW to drive the power switch module 10 to shut down, thereby disconnecting the power supply circuit and achieving overcurrent protection for the power supply circuit.

[0068] In the embodiment of the present application, the power switch tube module 10 is used to implement the normal on-off control and overcurrent protection of the power supply circuit. Compared with the use of relays and fuses in the related art, the cost is greatly reduced and the space occupied is also reduced.

[0069] In an exemplary embodiment, referring to Figure 2 , the protection module 20 includes a voltage conversion unit 220 and a comparison unit 210 .

[0070] The first input end of the voltage conversion unit 220 is connected to the first end of the power switch tube module 10, and the second input end of the voltage conversion unit 220 is connected to the second end of the power switch tube module 10; the voltage conversion unit 220 is configured to convert the voltages of the first end and the second end of the power switch tube module 10 into a single-ended voltage V3.

[0071] The voltage conversion unit 220 has the function of converting a differential signal into a single-ended signal, and can convert a pair of differential signals consisting of the voltage at the first end of the power switch tube module 10 and the voltage at the second end of the power switch tube module 10 into a single-ended signal; for example, the voltage conversion unit 220 can calculate the difference between the voltage at the first end of the power switch tube module 10 and the voltage at the second end of the power switch tube module 10 to obtain a single-ended voltage V3.

[0072] The input end of the comparison unit 210 is connected to the output end of the voltage conversion unit 220, and the output end of the comparison unit 210 is connected to the second driving module 40. The comparison unit 210 is configured to output a protection signal when it is determined that the single-ended voltage V3 is within the reference voltage range (Vref2, Vref1) corresponding to the desaturation voltage stage; wherein the second driving module 40 is connected to the control end of the power switch tube module 10 and the output end of the first driving module 30.

[0073] Here, the power switch tubes included in the power switch tube module 10 are all IGBTs. However, this does not limit the function of the comparison unit 210. When the power switch tubes are other types of power switch tubes, the function of the comparison unit 210 is also applicable:

[0074] When the power switch tube module 10 is in the saturation conduction stage, the single-ended voltage between the first end of the power switch tube module 10 and the second end of the power switch tube module 10 is recorded as V2_1; when the power switch tube module 10 is in the cut-off stage, the single-ended voltage between the first end of the power switch tube module 10 and the second end of the power switch tube module 10 is recorded as V2_2; when the power switch tube module 10 is in the desaturation stage, the single-ended voltage between the first end of the power switch tube module 10 and the second end of the power switch tube module 10 is recorded as V2_3, where V2_2 ≥ Vref1 > V2_3 > Vref2 ≥ V2_1, Vref1 is the first reference voltage, and Vref2 is the second reference voltage.

[0075] If the comparison unit 210 determines that the single-ended voltage V3 ≥ Vref1, it can be determined that the single-ended voltage V3 is not within the reference voltage range (Vref2, Vref1), and it can be determined that the power switch tube module 10 is in the saturated conduction stage, so the comparison unit 210 does not need to output the protection signal SW.

[0076] If the comparison unit 210 determines that the single-ended voltage V3 ≤ Vref2, it can be determined that the single-ended voltage V3 is not within the reference voltage range (Vref2, Vref1), and it can be determined that the power switch tube module 10 is in the cut-off stage, so the comparison unit 210 does not need to output the protection signal SW.

[0077] If the comparison unit 210 determines that Vref1>V3>Vref2, it can be determined that the single-ended voltage V3 is within the reference voltage range (Vref2, Vref1), and it can be determined that the power switch tube module 10 is in the desaturation conduction stage, so that the comparison unit 210 will output the protection signal SW from its own output terminal, and the second driving module 40 will output the second driving signal based on the protection signal SW to drive the power switch tube module 10 to turn off, thereby cutting off the power supply circuit and realizing overcurrent protection of the power supply circuit.

[0078] In an exemplary embodiment, referring to Figure 3 , the comparison unit 210 includes a first comparator U1 and a second comparator U2.

[0079] The first input terminal of the first comparator U1 is connected to the first reference voltage terminal for receiving the first reference voltage Vref1; the second input terminal of the first comparator U1 is connected to the output terminal of the voltage conversion unit 220; illustratively, the first input terminal of the first comparator U1 is the positive input terminal "+" of the first comparator U1, and the second input terminal of the first comparator U1 is the negative input terminal "-" of the first comparator U1.

[0080] The first input terminal of the second comparator U2 is connected to the output terminal of the voltage conversion unit 220; the second input terminal of the second comparator U2 is connected to the second reference voltage terminal for receiving the second reference voltage Vref2; illustratively, the first input terminal of the second comparator U2 is the positive input terminal "+" of the second comparator U2, and the second input terminal of the second comparator U2 is the negative input terminal "-" of the second comparator U2.

[0081] The output of the second comparator U2 is connected to the output of the first comparator U1, and the connection point serves as the output of the comparison unit 210. The connection point is also connected to a preset power supply Vcc via a first resistor subunit. The first reference voltage Vref1 at the first reference voltage terminal is greater than the second reference voltage Vref2 at the second reference voltage terminal. The specific values ​​of the first reference voltage Vref1 and the second reference voltage Vref2 can be configured according to actual application needs and are not limited thereto. The comparison unit 210 is configured to output a protection signal SW when the single-ended voltage V3 is less than the first reference voltage Vref1 and greater than the second reference voltage Vref2. This means that the single-ended voltage V3 is within the reference voltage range (Vref2, Vref1), indicating that the power switch module 10 is in the desaturated conduction phase. Consequently, the comparison unit 210 will output the protection signal SW from its output terminal.

[0082] For example, the protection signal SW is a high level. If the first comparator U1 determines that V3 ≥ Vref1, it can be determined that the power switch module 10 is in the saturated conduction stage, so that the output of the first comparator U1 outputs a low level and the comparison unit 210 outputs a low level. If the second comparator U2 determines that V3 ≤ Vref2, it can be determined that the power switch module 10 is in the cut-off stage, so that the output of the second comparator U2 outputs a low level and the comparison unit 210 outputs a low level. If the first comparator U1 and the second comparator U2 determine that Vref1 > V3 > Vref2, it can be determined that the power switch module 10 is in the desaturated conduction stage, so that the outputs of the first comparator U1 and the second comparator U2 both output a high level and the comparison unit 210 outputs a high level. This high level is the protection signal SW. Of course, in other embodiments, the protection signal SW can also be a low level or other type of signal, which is not limited to this.

[0083] In addition, a connection point between the output terminal of the first comparator U1 and the output terminal of the second comparator U2 is connected to a preset power supply Vcc through a first resistor subunit. The first resistor subunit serves as a pull-up resistor subunit to ensure reliable operation of the first comparator U1 and the second comparator U2. The first resistor subunit may include at least one resistor. Figure 3 The first resistor subunit is exemplarily illustrated as including a resistor, and is illustrated using the electrical symbol of a resistor in the field of circuit technology.

[0084] Exemplarily, the first input terminal of the first comparator U1 is connected to the first reference voltage terminal via a second resistor subunit, and the second input terminal of the first comparator U1 is connected to the output terminal of the voltage conversion unit 220 via a second resistor subunit. The first input terminal of the second comparator U2 is connected to the output terminal of the voltage conversion unit 220 via a second resistor subunit, and the second input terminal of the second comparator U2 is connected to the second reference voltage terminal via a second resistor subunit. The second resistor subunit acts as a current-limiting resistor subunit to ensure safe use of the first comparator U1 and the second comparator U2, thereby protecting them. The second resistor subunit may include at least one resistor. Figure 3 The second resistance subunit is exemplarily illustrated as including a resistor, and is illustrated using the electrical symbol of a resistor in the field of circuit technology.

[0085] In an exemplary embodiment, referring to Figure 4The second driving module 40 includes a switch unit 410. The switch unit 410 is connected to the output end of the protection module 20, the power switch module 10, and the output end of the first driving module 30. The switch unit 410 can be specifically connected to the control end of the power switch module 10. The switch unit 410 is configured to be turned on based on the protection signal SW to output the second drive signal to drive the power switch module 10 to turn off. This makes the structure of the second driving module 40 simple, easy to implement, and low-cost. The switch unit 410 is, for example, but not limited to, an electronic switch. The specific structure of the switch unit 410 is not limited in this embodiment of the application.

[0086] Exemplarily, when the protection signal SW is at a high level, the switch unit 410 is turned on based on the protection signal SW, outputting the second drive signal to turn off the power switch module 10. Accordingly, the switch unit 410 is turned off based on a low level, thereby not outputting the second drive signal. In this way, the protection module 20 and the second drive module 40 do not interfere with the driving of the first drive module 30. The first drive module 30 normally drives the power switch module 10 on or off, i.e., the first drive module 30 normally controls the on / off of the circuit.

[0087] In an exemplary embodiment, referring to Figure 5 The switch unit 410 includes a controllable switch. A first terminal of the controllable switch is grounded, a second terminal of the controllable switch is connected to the output terminal of the power switch module 10 and the first driver module 30, and a control terminal of the controllable switch is connected to the output terminal of the protection module 20. The controllable switch is configured to be turned on based on the protection signal SW to output the second drive signal. Specifically, the controllable switch is, for example but not limited to, a MOSFET. The controllable switch can be turned on by connecting the first end of the controllable switch to the second end of the controllable switch. In this case, the second drive signal is a ground signal. The ground signal lowers the potential of the output end of the first driver module 30, that is, the ground signal lowers the potential of the control end of the power switch module 10, thereby turning off the power switch module 10 and disconnecting the power supply circuit. The controllable switch can be turned off by disconnecting the first end of the controllable switch from the second end of the controllable switch. In this case, the ground signal cannot be transmitted to the output end of the first driver module 30, that is, the ground signal cannot be transmitted to the control end of the power switch module 10, and thus the ground signal cannot interfere with the driving of the first driver module 30. The first driver module 30 normally controls the power switch module 10 to be turned on or off, that is, the first driver module 30 normally controls the on / off of the circuit.

[0088] In an exemplary embodiment, referring to Figure 6The second driving module 40 also includes a delay unit 420; the switch unit 410 is connected to the output end of the protection module 20 through the delay unit 420; the protection module 20 is further configured to output a shutdown signal when it detects that the terminal voltage of the power switch tube module 10 is not in the desaturation voltage stage; the switch unit 410 is further configured to shut down based on the shutdown signal; the delay unit 420 is configured to: when the shutdown signal, the protection signal and the shutdown signal are received in sequence within a preset time period, filter out the protection signal within the preset time period, wherein the preset time period is equal to the time required for the power switch tube module 10 to be normally turned on, or the preset time period is equal to the time required for the power switch tube module 10 to be normally turned off.

[0089] When the terminal voltage of the power switch module 10 is not in the desaturation voltage stage, it indicates that the power switch module 10 may be in the cut-off stage or the saturation conduction stage.

[0090] For example, the protection signal SW is at a high level and the shutdown signal is at a low level. During the normal conduction process of the power switch tube module 10, the single-ended voltage V3 between the first end of the power switch tube module 10 and the second end of the power switch tube module 10 dynamically undergoes a process of V2_2, V2_3, and V2_1. This process typically takes several hundred nanoseconds, that is, the preset period can be several hundred nanoseconds. During these several hundred nanoseconds, the protection module 20 sequentially outputs a shutdown signal, a protection signal SW, and a shutdown signal. The protection signal SW causes the second driver module 40 to output a second drive signal to drive the power switch tube module 10 to shut down. However, during these several hundred nanoseconds, the power switch tube module 10 is actually conducting normally and does not need to be driven to shut down. Therefore, the delay unit 420 filters out the protection signal SW to avoid driving the power switch tube module 10 to shut down during the normal conduction period of the power switch tube module 10.

[0091] Similarly, during the normal shutdown process of the power switch tube module 10, the single-end voltage V3 between the first end of the power switch tube module 10 and the second end of the power switch tube module 10 dynamically experiences the process of V2_1 V2_3 V2_2. The duration of this process is also several hundred nanoseconds, that is, the preset period is several hundred nanoseconds. During these several hundred nanoseconds, the protection module 20 will sequentially output the shutdown signal, the protection signal SW and the shutdown signal. In order to avoid affecting the normal shutdown of the power switch tube module 10 during the normal shutdown period of the power switch tube module 10, the delay unit 420 filters out the protection signal.

[0092] In actual applications, different types and styles of power switching tubes require different times for normal conduction, and different types and styles of power switching tubes require different times for normal shutdown. Therefore, the time required for normal conduction or normal shutdown of the power switching tube used can be determined based on the power switching tube actually used, so that the preset time period can be configured as the time required for normal conduction or normal shutdown of the power switching tube used.

[0093] In an exemplary embodiment, referring to Figure 7 The first driving module 30 is also connected to the output end of the protection module 20. The first driving module 30 is configured to output a third driving signal to drive the power switch tube module 10 to turn off when the number of consecutive times the protection signal SW is received is greater than a first preset number.

[0094] The first driver module 30 is also configured to count the number of protection signals SW. Each protection signal SW output by the protection module 20 represents each time the circuit experiences an abnormality such as overcurrent or overload. If the first driver module 30 continuously receives protection signals SW for more than a first preset number of times, it indicates that the number of abnormalities such as overcurrent or overload experienced by the circuit has exceeded an upper limit. At this point, the first driver module 30 is required to output a third drive signal to shut down the power switch module 10 to prevent damage to the power switch module 10 and the load. Exemplarily, the third drive signal is a low level.

[0095] Optional, reference Figure 7 The control device 1 of the power supply circuit also includes a signal isolation module 50, which is arranged between the output end of the protection module 20 and the first driving module 30 to perform isolation protection between the output end of the protection module 20 and the first driving module 30, thereby achieving reliable counting of the first driving module 30.

[0096] In an exemplary embodiment, referring to Figure 8 The control device 1 for the power supply circuit further includes a temperature detection module 60, which is configured to detect the module temperature of the power switch tube module 10; the first driving module 30 is also connected to the temperature detection module 60, and the first driving module 30 is further configured to output the first driving signal again to drive the power switch tube module 10 to turn on if the difference between the module temperature and the reference temperature is less than a preset threshold after outputting the third driving signal to drive the power switch tube module 10 to turn off.

[0097] The reference temperature can be configured according to actual application needs or can be based on the ambient temperature detected by a temperature sensor. The temperature detection module 60 includes, for example, but not limited to, a temperature sensor. Generally, when the number of times the circuit experiences abnormalities such as undercurrent / overload exceeds an upper limit, the module temperature of the power switch module 10 rises. Therefore, the module temperature can be detected. When the difference between the module temperature and the reference temperature is detected to be less than a preset threshold, it indicates that the circuit state may have basically recovered. At this time, the first drive signal can be re-output to drive the power switch module 10 to conduct, so that the circuit can continue to supply power to the load normally.

[0098] Optionally, the first driving module 30 is further configured to stop driving the power switch module 10 if the number of times the third driving signal is outputted exceeds a second preset number after the first driving signal is re-output to drive the power switch module 10 to conduct. For example, the second preset number is, for example but not limited to, two times.

[0099] If, after the first drive signal is re-output to drive the power switch module 10 to conduct, the first drive module 30 still continuously receives the protection signal SW for a number greater than the first preset number of times, the third drive signal is again output to drive the power switch module 10 to turn off. If the third drive signal is outputted repeatedly for a number greater than the second preset number of times, it indicates that the circuit is abnormal. The first drive module 30 can directly output a circuit abnormality signal to report the circuit abnormality and stop driving the power switch module 10. If, after the first drive signal is re-output to drive the power switch module 10 to conduct, the first drive module 30 no longer continuously receives the protection signal SW for a number greater than the first preset number of times, it indicates that the circuit has returned to normal. In this way, the third drive signal is not output, and the circuit abnormality signal is not output, and the circuit continues to operate normally.

[0100] In the embodiment of the present application, a first driver module 30 is provided to monitor the number of protection signals SW to protect the control device 1 of the power supply circuit and provide greater flexibility in the control scheme of the power supply circuit. In practical applications, the specific strategy for turning on or off the power switch module 10 based on the number of protection signals SW can be adjusted according to actual application requirements. The specific strategy for turning on or off the power switch module 10 by combining the number of protection signals SW with the module temperature can also be adjusted according to actual application requirements. In other words, the specific strategy for turning on or off the power switch module 10 based on the number of protection signals SW and / or the module temperature can be configured according to actual application requirements, and all of these are within the scope of protection of the present application.

[0101] In an exemplary embodiment, referring to Figure 8The power supply circuit control device 1 further includes a temperature detection module 60 configured to detect the module temperature of the power switch module 10. The first driver module 30 is also connected to the temperature detection module 60 and configured to output a fourth drive signal to shut down the power switch module 10 when the difference between the module temperature and a reference temperature exceeds a preset threshold, indicating a possible circuit abnormality. This protects the circuit components and the power switch module 10. Exemplarily, the fourth drive signal is at a low level.

[0102] Optional, combined Figure 8 and Figure 9 The first driving module 30 is further configured to output the first driving signal again to drive the power switch module 10 to turn on after outputting the fourth driving signal to drive the power switch module 10 to turn off, and stop driving the power switch module 10 if the difference between the module temperature and the reference temperature is still greater than the preset threshold.

[0103] For example, after the module temperature recovers from exceeding the preset temperature threshold T_max to the reference temperature T_ref, an attempt is made to drive the power switch tube module 10 to turn on again. If the module temperature still soars to exceed the preset temperature threshold T_max after turning on, the power switch tube module 10 is driven to turn off again, indicating that the circuit is abnormal. The first driving module 30 can directly output a circuit abnormality signal to realize the circuit abnormality reporting and stop driving the power switch tube module 10.

[0104] After the module temperature recovers from exceeding the preset temperature threshold T_max to the reference temperature T_ref, an attempt is made to drive the power switch tube module 10 to turn on again. If, after turning on, the module temperature does not soar to exceed the preset temperature threshold T_max, but is close to the reference temperature T_ref, the fourth drive signal is not output, and the loop abnormality signal is not output, and the loop continues to operate normally.

[0105] In the embodiment of the present application, a temperature detection module 60 is provided to monitor the temperature of the power switch module 10 to provide overheat protection for the power switch module 10 and the entire control device 1, and to provide greater flexibility in the control scheme of the power supply circuit. In practical applications, the specific strategy for turning the power switch module 10 on or off based on the module temperature can be adjusted according to actual application requirements. In other words, the specific strategy for turning the power switch module 10 on or off based on the module temperature can be configured according to actual application requirements and is within the scope of protection of the present application.

[0106] In an exemplary embodiment, referring to Figure 10The power switch module 10 includes an insulated gate bipolar transistor Q1; a first terminal of the insulated gate bipolar transistor Q1 serves as a first terminal of the power switch module 10; a second terminal of the insulated gate bipolar transistor Q1 serves as a second terminal of the power switch module 10; and a control terminal of the insulated gate bipolar transistor Q1 serves as a control terminal of the power switch module 10. This makes the power switch module 10 simple in structure, low in cost, easy to implement, and compact in size.

[0107] In an exemplary embodiment, the first driving module 30 includes a processing unit and a driving unit.

[0108] The input end of the driving unit is connected to the processing unit, and the driving output end of the driving unit is respectively connected to the control end of the power switch tube module 10 and the second driving module 40; the processing unit is used to send a control signal to the driving unit according to the driving instruction; the driving unit is used to drive the power switch tube module 10 to be turned on or off according to the control signal. Exemplarily, the processing unit is an MCU, and the driving unit is a driving chip. The driving output end of the driving unit can also be connected to the control end of the power switch tube module 10 through a current limiting resistor to protect the driving unit; and the input end of the driving unit can also be connected to a pull-down resistor to prevent the driving unit from being triggered incorrectly during the initialization phase. Exemplarily, the driving unit includes a driving chip.

[0109] The following is a further exemplary supplementary explanation of the technical solutions of the embodiments of the present application in conjunction with the drawings of the present application specification:

[0110] The processing unit sends a control signal to the driving unit according to the driving instruction. The driving unit drives the insulated gate bipolar transistor Q1 to be normally turned on or off according to the control signal, thereby achieving normal on-off control of the power supply circuit.

[0111] After the IGBT Q1 is normally turned on, if the comparison unit 210 detects that the single-terminal voltage V3 of the IGBT Q1 is in the desaturation voltage stage, it indicates that an abnormality such as overcurrent / overload exists in the circuit. Therefore, the comparison unit 210 outputs a protection signal SW (e.g., a high level), and the controllable switch is turned on according to the protection signal SW, so that the ground signal is transmitted to the output terminal of the first driving module 30, that is, to the control terminal of the IGBT Q1, thereby turning off the IGBT Q1 and implementing overcurrent / overload protection for the circuit.

[0112] After the IGBT Q1 is normally turned on, if the comparison unit 210 detects that the IGBT Q1 is in the saturated conduction or cut-off stage, it means that no abnormality such as overcurrent / overload exists in the circuit at this time. Therefore, the comparison unit 210 outputs a shutdown signal (for example, a low level), and the controllable switch is turned off according to the shutdown signal, so that the ground signal is not transmitted to the output end of the first driving module 30, so that the IGBT Q1 is still normally driven by the output of the first driving module 30.

[0113] The present application also provides a vehicle, comprising a power supply, a load, and a power supply circuit control device 1 as provided in any of the above embodiments; wherein the power supply is, for example, a power battery or a low-voltage battery. The load is, for example, a high-voltage or low-voltage device in the vehicle requiring power. The power supply is connected to a first terminal of a power switch module 10 in the power supply circuit control device 1, and the load is connected to a second terminal of the power switch module 10.

[0114] The control devices for the vehicle and the power supply circuit provided in the embodiments of the present application both belong to the same inventive concept, can solve the same technical problems, and thus achieve the same technical effects, and the repeated contents will not be repeated here.

[0115] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0116] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A control device for a power supply circuit, characterized in that: include: A power switch tube module, the power switch tube module is connected in series to the power supply circuit and is configured to connect or disconnect the power supply circuit; a protection module, wherein an input terminal of the protection module is connected to the power switch module and is configured to output a protection signal when detecting that the terminal voltage of the power switch module is in a desaturation voltage stage; A first driving module, wherein an output end of the first driving module is connected to the power switch module and is configured to output a first driving signal to drive the power switch module to conduct; The second driving module is connected to the output end of the protection module, the power switch module and the output end of the first driving module, and is configured to output a second driving signal based on the protection signal to drive the power switch module to turn off.

2. The device according to claim 1, characterized in that The protection module includes: a voltage conversion unit, wherein a first input terminal of the voltage conversion unit is connected to the first terminal of the power switch tube module, a second input terminal of the voltage conversion unit is connected to the second terminal of the power switch tube module, and the voltage conversion unit is configured to convert the voltage between the first terminal and the second terminal of the power switch tube module into a single-ended voltage; a comparison unit, wherein the input end of the comparison unit is connected to the output end of the voltage conversion unit, the output end of the comparison unit is connected to the second driving module, and is configured to output the protection signal when it is determined that the single-ended voltage is within the reference voltage range corresponding to the desaturation voltage stage, wherein the second driving module is connected to the control end of the power switch tube module and the output end of the first driving module.

3. The device according to claim 2, characterized in that The comparison unit includes: a first comparator, wherein a first input terminal of the first comparator is connected to a first reference voltage terminal, and a second input terminal of the first comparator is connected to an output terminal of the voltage conversion unit; a second comparator, wherein a first input terminal of the second comparator is connected to the output terminal of the voltage conversion unit, and a second input terminal of the second comparator is connected to a second reference voltage terminal; In which, the output end of the second comparator is connected to the output end of the first comparator, and the connection point serves as the output end of the comparison unit, and the connection point is connected to a preset power supply through a first resistance sub-unit; the first reference voltage of the first reference voltage end is greater than the second reference voltage of the second reference voltage end, and the comparison unit is configured to output the protection signal when the single-ended voltage is less than the first reference voltage and greater than the second reference voltage.

4. The device according to claim 1, characterized in that The second driving module includes: A controllable switch, wherein a first end of the controllable switch is grounded, a second end of the controllable switch is connected to the output end of the power switch tube module and the first driving module, and a control end of the controllable switch is connected to the output end of the protection module, and is configured to be turned on based on the protection signal to output the second driving signal.

5. The device according to claim 6, characterized in that The second driving module further includes: A delay unit, wherein the controllable switch is connected to the output end of the protection module via the delay unit; The protection module is further configured to output a shutdown signal when detecting that the terminal voltage of the power switch module is not in the desaturation voltage stage; The controllable switch is further configured to be turned off based on the turn-off signal; The delay unit is configured to: when the shutdown signal, the protection signal and the shutdown signal are received in sequence within a preset time period, filter out the protection signal within the preset time period, wherein the preset time period is equal to the time required for the power switch tube module to be normally turned on, or the preset time period is equal to the time required for the power switch tube module to be normally turned off.

6. The device according to any one of claims 1 to 5, characterized in that The first driving module is also connected to the output end of the protection module, and is configured to output a third driving signal to drive the power switch module to turn off when the number of times the protection signal is continuously received is greater than a first preset number.

7. The device according to claim 6, characterized in that Also includes: A signal isolation module is provided between the output end of the protection module and the first driving module.

8. The device according to claim 6, characterized in that Also includes: a temperature detection module, configured to detect the module temperature of the power switch tube module; The first driving module is also connected to the temperature detection module and is configured to output the first driving signal again to drive the power switch tube module to turn on if the difference between the module temperature and the reference temperature is less than a preset threshold after outputting the third driving signal to drive the power switch tube module to turn off.

9. The device according to claim 8, characterized in that The first driving module is further configured to stop driving the power switch module if the number of times the third driving signal is output is greater than a second preset number after the first driving signal is re-output to drive the power switch module to conduct.

10. The device according to any one of claims 1 to 5, characterized in that Also includes: a temperature detection module, configured to detect the module temperature of the power switch tube module; The first driving module is also connected to the temperature detection module, and is configured to output a fourth driving signal to drive the power switch module to turn off when the difference between the module temperature and the reference temperature is greater than a preset threshold.

11. The device according to claim 10, characterized in that The first driving module is further configured to, after outputting the fourth driving signal to drive the power switch tube module to turn off, re-output the first driving signal to drive the power switch tube module to turn on, and stop driving the power switch tube module if the difference between the module temperature and the reference temperature is still greater than a preset threshold.

12. A vehicle, characterized in that: It includes a power supply, a load and a control device for the power supply circuit as described in any one of claims 1 to 11; the power supply is connected to the first end of the power switch tube module in the control device of the power supply circuit, and the load is connected to the second end of the power switch tube module.

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