Driving circuit of power converter, power converter and power supply equipment

Abstract

The invention discloses a driving circuit of a power converter, the power converter and power supply equipment, and belongs to the technical field of power electronics. The drive circuit comprises a drive signal transmission unit, a push-pull circuit, a drive impedance network and a drive rate adjusting unit, the drive rate adjusting unit comprises a first switch, and the first switch is used for connecting the drive rate adjusting unit to the push-pull circuit or disconnecting the drive rate adjusting unit from the push-pull circuit. The driving rate adjusting unit comprises at least one of an acceleration unit and a speed limiting unit, the acceleration unit is used for increasing the current of the push-pull circuit, and the speed limiting unit is used for reducing the current of the push-pull circuit; wherein the driving rate adjusting unit is used for adjusting the current of the push-pull circuit and changing the current input to the driving impedance network so as to adjust the driving rate of the driving circuit for driving the power conversion circuit. The drive circuit changes the current of the push-pull circuit and adjusts the drive rate by arranging the drive rate adjusting unit, and is high in response speed, high in loading capacity and high in operation stability.

Description

Technical Field

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

[0002] A power converter is a power conversion device that can convert electrical energy from one form to another to meet the power requirements of different devices or systems. It is widely used in power systems, electronic equipment, industrial control and other fields. In a power converter, the drive circuit is a key component that connects the control circuit and the power transistor. The drive circuit drives the power transistor to achieve power conversion by amplifying the control signal.

[0003] To ensure the stability and safety of the power converter operation, the voltage stress of the power transistor needs to be kept lower than its maximum tolerance during the power conversion process. The driving rate of the drive circuit can be reduced to suppress the voltage of the power transistor from rising or falling too quickly, so that the voltage stress is below the limit value. At the same time, in the working condition where the voltage stress is significantly lower than the maximum tolerance, the driving rate of the drive circuit can be increased to reduce the voltage-current overlap time in the power transistor and the voltage-current overlap time of the drive circuit, thereby reducing the loss of the power transistor and the drive circuit.

[0004] The current drive rate regulation method has a slow response speed and is prone to cause power transistor gate oscillation, affecting the performance and stability of the power converter operation. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a driving circuit, a power converter and a power supply device of a power converter, which have a fast driving rate adjustment response speed and a strong load capacity, and can ensure the performance and stability of the power converter operation.

[0006] In a first aspect, the present application provides a driving circuit of a power converter, comprising:

[0007] A driving signal transmission unit;

[0008] A push-pull circuit, the push-pull circuit comprising a first resistor, a first switch tube and a second switch tube, one end of the first resistor is connected to the drive signal transmission unit, the other end of the first resistor is connected to the base of the first switch tube and the base of the second switch tube, the emitter of the first switch tube and the emitter of the second switch tube are connected to form a load end, the collector of the first switch tube forms a high level end, and the collector of the second switch tube forms a low level end;

[0009] A driving impedance network, one end of which is connected to the load end, and the other end of which is used to be connected to a power conversion circuit of a power converter;

[0010] a driving rate regulating unit, the driving rate regulating unit being connected to the push-pull circuit, the driving rate regulating unit comprising a first switch, the first switch being used to connect the driving rate regulating unit to the push-pull circuit or to disconnect the driving rate regulating unit from the push-pull circuit, the driving rate regulating unit comprising at least one of an accelerating unit and a speed limiting unit, the accelerating unit being used to increase the current of the push-pull circuit, and the speed limiting unit being used to reduce the current of the push-pull circuit;

[0011] The driving rate adjustment unit is used to adjust the current of the push-pull circuit, change the current input to the driving impedance network, and adjust the driving rate of the driving circuit driving the power conversion circuit.

[0012] According to the driving circuit of the power converter of the present application, by setting a driving rate adjustment unit, the current input to the driving impedance network of the push-pull circuit is adjusted by utilizing the first switch, the acceleration unit, and the speed limiting unit. The driving rate adjustment has a fast response speed and a strong load capacity, which can ensure the performance and stability of the power converter operation.

[0013] According to one embodiment of the present application, one end of the drive rate adjustment unit is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the drive rate adjustment unit is connected to the drive signal transmission unit, and the drive rate adjustment unit is used to adjust the base current of the push-pull circuit.

[0014] According to an embodiment of the present application, the driving rate adjustment unit includes a first acceleration branch connected in parallel with the first resistor, the first acceleration branch includes the acceleration unit and the first switch connected in series, one end of the first acceleration branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first acceleration branch is connected to the driving signal transmission unit;

[0015] Wherein, when the first acceleration branch is turned on, it is used to increase the base current of the push-pull circuit.

[0016] According to an embodiment of the present application, the driving speed regulating unit further includes the speed limiting unit, and the speed limiting unit is connected between the first acceleration branch and the driving signal transmission unit.

[0017] According to an embodiment of the present application, the driving rate adjustment unit includes a first speed limiting branch connected in series with the first resistor, the first speed limiting branch includes the speed limiting unit and the first switch connected in parallel, one end of the first speed limiting branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first speed limiting branch is connected to the driving signal transmission unit;

[0018] Wherein, when the first speed limiting branch is turned on, it is used to reduce the base current of the push-pull circuit.

[0019] According to one embodiment of the present application, one end of the drive speed adjustment unit is connected to the base of the first switching tube and the base of the second switching tube, and the other end of the drive speed adjustment unit is connected to the high level end or the low level end, and the drive speed adjustment unit is used to adjust the base current of the push-pull circuit.

[0020] According to an embodiment of the present application, the driving rate adjustment unit includes a first shunt branch, the first shunt branch includes the speed limiting unit and the first switch connected in series, one end of the first shunt branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first shunt branch is connected to the high level end or the low level end;

[0021] Wherein, when the first shunt branch is turned on, it is used to reduce the base current of the push-pull circuit.

[0022] According to an embodiment of the present application, one end of the driving speed adjustment unit is connected to the load end, and the driving speed adjustment unit is used to adjust the current input to the driving impedance network.

[0023] According to one embodiment of the present application, the driving rate adjustment unit includes a second shunt branch, the second shunt branch includes the speed limiting unit and the first switch connected in series, one end of the second shunt branch is connected to the load end, and the other end of the second shunt branch is connected to the base of the first switch tube and the base of the second switch tube;

[0024] Wherein, when the second shunt branch is turned on, it is used to reduce the current input to the driving impedance network.

[0025] According to an embodiment of the present application, the driving rate adjustment unit includes a first boost branch, the first boost branch includes the acceleration unit and the first switch connected in series, one end of the first boost branch is connected to the load end, and the other end of the first boost branch is connected to the base of the first switch tube and the base of the second switch tube;

[0026] Wherein, when the first boost branch is turned on, it is used to increase the current input to the driving impedance network.

[0027] According to one embodiment of the present application, the driving speed regulating unit includes a second speed limiting branch, the second speed limiting branch includes the speed limiting unit and the first switch connected in series, one end of the second speed limiting branch is connected to the load end, and the other end of the second speed limiting branch is connected to one of the high level end or the low level end;

[0028] Wherein, when the second speed limiting branch is turned on, it is used to reduce the current input to the driving impedance network.

[0029] According to an embodiment of the present application, the acceleration unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device.

[0030] According to an embodiment of the present application, the speed limiting unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device.

[0031] According to one embodiment of the present application, the push-pull circuit also includes a first capacitor, a second capacitor, a first voltage stabilizing unit, and a second voltage stabilizing unit. The collector of the first switching tube is connected to the first capacitor, the collector of the second switching tube is connected to the second capacitor, the first capacitor and the second capacitor are connected to a first connection point, the power conversion circuit is connected to the first connection point, the first voltage stabilizing unit is connected in parallel with the first capacitor, and the second voltage stabilizing unit is connected in parallel with the second capacitor.

[0032] In a second aspect, the present application provides a power converter, comprising:

[0033] Control circuit;

[0034] The driving circuit of the power converter as described in the first aspect above, wherein the driving signal transmission unit of the driving circuit is connected to the control circuit;

[0035] A power conversion circuit is connected to the drive circuit, and the drive circuit is used to process the drive signal output by the control circuit and output the processed drive signal to the power conversion circuit to drive the power conversion circuit to perform power conversion.

[0036] In a third aspect, the present application provides a power supply device, including:

[0037] A power converter as described in the second aspect above.

[0038] In a fourth aspect, the present application provides a control method for a power converter, the method being applied to the power converter described in the second aspect above, the method comprising:

[0039] Obtaining predicted voltage stress of a power conversion circuit;

[0040] When the predicted voltage stress is greater than a first stress reference threshold, controlling the driving circuit to operate in a first driving mode;

[0041] When the predicted voltage stress is less than a second stress reference threshold, the driving circuit is controlled to operate in a second driving mode, the first stress reference threshold is greater than the second stress reference threshold, and the driving rate of the second driving mode is greater than the driving rate of the first driving mode.

[0042] According to the control method of the power converter of the present application, by comparing the predicted voltage stress with the preset reference threshold, the power converter is controlled to operate in a driving mode with different driving speeds according to the comparison result, with high stability and strong adaptability. The driving speed is controlled by a driving speed adjustment unit to switch the driving mode of the power converter. The driving speed adjustment has a fast response speed and a strong load capacity, which can ensure the performance and stability of the power converter operation.

[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 This is one of the structural schematic diagrams of the driving circuit of the power converter provided in the embodiment of the present application;

[0046] Figure 2 This is a second structural schematic diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0047] Figure 3 This is the third structural schematic diagram of the driving circuit of the power converter provided in the embodiment of the present application;

[0048] Figure 4 This is a fourth structural schematic diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0049] Figure 5 This is a fifth structural diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0050] Figure 6This is the sixth structural schematic diagram of the driving circuit of the power converter provided in the embodiment of the present application;

[0051] Figure 7 This is the seventh structural schematic diagram of the driving circuit of the power converter provided in the embodiment of the present application;

[0052] Figure 8 This is an eighth structural schematic diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0053] Fig. 9 This is a ninth structural diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0054] Fig.10 10 is a structural schematic diagram of a driving circuit of a power converter provided in an embodiment of the present application;

[0055] Fig.11 is a schematic diagram of the structure of a power converter provided in an embodiment of the present application;

[0056] Fig.12 It is one of the flow charts of the control method of the power converter provided in the embodiment of the present application;

[0057] Fig.13 This is the second flow chart of the power converter control method provided in the embodiment of the present application.

[0058] Reference numerals:

[0059] The power converter 10, the control circuit 100, the drive circuit 200, the drive signal transmission unit 210, the first resistor 221, the first switch tube 222, the second switch tube 223, the first capacitor 224, the second capacitor 225, the first voltage stabilizing unit 226, the second voltage stabilizing unit 227,

[0060] A driving impedance network 230 , a driving speed adjustment unit 240 , a first switch 241 , an acceleration unit 242 , a speed limiting unit 243 , a load terminal 201 , a high level terminal 202 , a low level terminal 203 , and a power conversion circuit 300 . DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0062] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0063] In the related art, there are several ways to adjust the driving speed:

[0064] First, the driving impedance unit is adjusted to adjust the driving rate. The current on the driving impedance unit is between the signal level and the power level, requiring the control unit to have a strong load capacity. At the same time, directly adjusting the driving impedance unit may cause gate oscillation of the power transistor and affect the stable operation of the system.

[0065] Secondly, the driving voltage is adjusted to adjust the driving speed. The driving voltage is filtered by a large-capacity capacitor, and the voltage change rate is slow, making it difficult to quickly respond to the driving speed adjustment requirements.

[0066] Third, adding multiple driving voltages to provide driving rate adjustment capability and introducing multiple driving voltage branches may cause some branches to be idle, increase power conversion costs, and reduce power density.

[0067] The current drive rate regulation method has a slow response speed and is prone to cause power transistor gate oscillation, affecting the performance and stability of the power converter operation.

[0068] In conjunction with the accompanying drawings, the drive circuit 200 of the power converter 10, the power converter 10, the power supply device and the control method of the power converter 10 provided in the embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0069] The driving circuit 200 of the power converter 10 in the embodiment of the present application has a fast driving rate adjustment response speed and a strong load capacity, and can ensure the performance and stability of the power converter 10.

[0070] like Figure 1 As shown, the driving circuit 200 of the power converter 10 includes a driving signal transmission unit 210 , a push-pull circuit, a driving impedance network 230 and a driving speed adjustment unit 240 .

[0071] Among them, the drive signal transmission unit 210 is connected to the control circuit 100 of the power converter 10, and the drive signal transmission unit 210 plays the role of transmitting the drive signal. The functions of the drive signal transmission unit 210 include but are not limited to transmitting, modulating, demodulating, buffering, stabilizing, etc. the drive signal from the control circuit 100.

[0072] The push-pull circuit may include a first resistor 221, a first switch tube 222 and a second switch tube 223, one end of the first resistor 221 is connected to the drive signal transmission unit 210, the other end of the first resistor 221 is connected to the base of the first switch tube 222 and the base of the second switch tube 223, the emitter of the first switch tube 222 and the emitter of the second switch tube 223 are connected to form a load end 201, the collector of the first switch tube 222 forms a high level end 202, and the collector of the second switch tube 223 forms a low level end 203.

[0073] The first resistor 221 is a resistor between the driving signal transmission unit 210 and the two switch tubes, and can limit the magnitude of the current input to the two switch tubes.

[0074] It can be understood that the first switch tube 222 and the second switch tube 223 exist in the push-pull circuit in a push-pull manner, and the first switch tube 222 and the second switch tube 223 are responsible for waveform amplification tasks of the positive and negative half cycles respectively.

[0075] In this embodiment, one end of the driving impedance network 230 is connected to the load end 201 , and the other end of the driving impedance network 230 is used to be connected to the power conversion circuit 300 of the power converter 10 .

[0076] In actual implementation, the other end of the driving impedance network 230 is connected to the gate of the power transistor in the power conversion circuit 300 .

[0077] The driving signal transmission unit 210 is connected to the push-pull circuit, and the push-pull circuit is connected to the driving impedance network 230. The driving signal transmission unit 210 transmits the driving signal to the push-pull circuit. The push-pull circuit can convert the input driving signal into high and low levels that can directly drive the power conversion circuit 300. The high and low levels generated by the push-pull circuit are transmitted through the driving impedance network 230.

[0078] In actual implementation, the power conversion circuit 300 includes a power transistor, the gate of the power transistor is connected to the drive circuit 200, and the drive impedance network 230 plays a role in regulating and optimizing signal transmission to ensure that the gate of the power transistor can receive a drive signal of appropriate strength.

[0079] It can be understood that the control circuit 100, the drive signal transmission unit 210, the push-pull circuit, the drive impedance network 230 and other components work together to achieve effective driving of the power transistor. The control circuit 100 generates a drive signal according to system requirements and operating conditions. The drive signal generated by the control circuit 100 is transmitted to the drive signal transmission unit 210. The drive signal transmission unit 210 processes the drive signal to adapt to different application scenarios. The push-pull circuit converts the input signal into high and low levels that can directly drive the gate of the power transistor. The high and low levels are transmitted through the drive impedance network 230. The gate of the power transistor receives the processed drive signal to achieve switching control of the power transistor.

[0080] In this embodiment, a driving speed adjustment unit 240 is provided in the driving circuit 200, and the driving speed adjustment unit 240 is connected to the push-pull circuit. The driving speed adjustment unit 240 is used to adjust the current of the push-pull circuit and change the current input to the driving impedance network 230 to adjust the driving speed of the driving circuit 200 to drive the power conversion circuit 300.

[0081] like Figure 1 As shown, the driving speed adjustment unit 240 includes a first switch 241, and the first switch 241 is used to connect the driving speed adjustment unit 240 to the push-pull circuit or cut it out from the push-pull circuit. The driving speed adjustment unit 240 includes at least one of an acceleration unit 242 and a speed limiting unit 243, and the acceleration unit 242 is used to increase the current of the push-pull circuit, and the speed limiting unit 243 is used to reduce the current of the push-pull circuit.

[0082] In this embodiment, the acceleration unit 242 and the speed limiting unit 243 are components in the driving rate adjustment unit 240 that change the current of the push-pull circuit. These two types of units are combined with the first switch 241, and the driving rate adjustment unit 240 is connected to the push-pull circuit or cut off from the push-pull circuit through the first switch 241, thereby realizing the adjustment effect of the acceleration unit 242 and the speed limiting unit 243 on the current of the push-pull circuit.

[0083] In some embodiments, the acceleration unit 242 may include at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device, and the acceleration unit 242 may increase the current of the push-pull circuit.

[0084] In some embodiments, the speed limiting unit 243 includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device, and the speed limiting unit 243 can reduce the current of the push-pull circuit.

[0085] In some embodiments, the first switch 241 is a unit with switching capability, including but not limited to an equivalent switch composed of semiconductor devices, an equivalent switch with controlled resistance, a relay, and the like.

[0086] In actual implementation, the control circuit 100 may be connected to the first switch 241 for communication ( Figure 1 The control circuit 100 can control the closing and opening of the first switch 241, connect the driving speed adjustment unit 240 to the push-pull circuit or cut it out from the push-pull circuit to achieve the control of the driving speed.

[0087] The current drive rate regulation method has a slow response speed and is prone to cause power transistor gate oscillation, affecting the performance and stability of the power converter operation.

[0088] In an embodiment of the present application, a driving speed adjustment unit 240 is added to the driving circuit 200. The driving speed adjustment unit 240 includes components such as a first switch 241, an acceleration unit 242, and a speed limiting unit 243. The driving speed of the power conversion circuit 300 is quickly and accurately controlled by adjusting the current input to the driving impedance network 230 by the push-pull circuit. The driving impedance network 230 is not directly adjusted. The load capacity is strong and will not cause gate oscillation of the power transistor. The current change rate is fast and the driving speed adjustment response speed is fast, which can ensure the performance and stability of the power converter 10.

[0089] According to the driving circuit 200 of the power converter 10 provided in the embodiment of the present application, by setting a driving speed adjustment unit 240, using the first switch 241, the acceleration unit 242, and the speed limiting unit 243, the current input to the driving impedance network 230 of the push-pull circuit is adjusted, and the driving speed adjustment has a fast response speed and a strong load capacity, which can ensure the performance and stability of the power converter 10.

[0090] The following specifically describes how to adjust the current input to the driving impedance network 230 by the push-pull circuit in the embodiment of the present application to achieve driving rate regulation from several different implementation perspectives.

[0091] 1. Increase or decrease the current at the base of the input push-pull circuit.

[0092] In some embodiments, one end of the driving speed adjustment unit 240 is connected to the base of the first switching tube 222 and the base of the second switching tube 223, and the other end of the driving speed adjustment unit 240 is connected to the driving signal transmission unit 210. The driving speed adjustment unit 240 is used to adjust the base current of the push-pull circuit.

[0093] In this embodiment, one end of the driving speed adjustment unit 240 is connected to the base of the push-pull circuit (i.e., the base of the first switching tube 222 and the base of the second switching tube 223), and the driving signal processed by the driving signal transmission unit 210 is input to the base of the push-pull circuit through the driving speed adjustment unit 240, and the driving speed adjustment unit 240 realizes the adjustment of the base current of the push-pull circuit.

[0094] It is understandable that adjusting the base current of the input push-pull circuit can change the current of the load terminal 201 of the push-pull circuit, affect the current input to the driving impedance network 230 of the push-pull circuit, and achieve the adjustment of the driving rate.

[0095] In some embodiments, Figure 2 As shown, the driving speed adjustment unit 240 includes a first acceleration branch connected in parallel with the first resistor 221, the first acceleration branch includes an acceleration unit 242 and a first switch 241 connected in series, one end of the first acceleration branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223, and the other end of the first acceleration branch is connected to the driving signal transmission unit 210.

[0096] Wherein, when the first acceleration branch is turned on, it is used to increase the base current of the push-pull circuit.

[0097] In this embodiment, the acceleration unit 242 and the first switch 241 connected in series form a first acceleration branch, the first acceleration branch is connected in parallel with the first resistor 221, and a parallel branch is provided at the base of the push-pull circuit to achieve driving rate control.

[0098] In actual implementation, when the first switch 241 is closed and the first acceleration branch is turned on, the driving speed adjustment unit 240 having the acceleration unit 242 is connected to the push-pull circuit. At this time, the driving speed adjustment unit 240 increases the base current of the push-pull circuit, which can speed up the driving speed of the power conversion circuit 300.

[0099] When the first switch 241 is disconnected and the first acceleration branch is cut off, the driving rate adjustment unit 240 having the acceleration unit 242 is cut out from the push-pull circuit, the base current of the push-pull circuit decreases, and the driving rate of the power conversion circuit 300 decreases.

[0100] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0101] like Figure 2 As shown, the first switch 241 is closed, the first acceleration branch is turned on, the acceleration unit 242 is activated, and the power converter 10 is switched to the second driving mode; the first switch 241 is opened, the first acceleration branch is cut off, the acceleration unit 242 is cut out, and the power converter 10 is switched to the first driving mode.

[0102] In some embodiments, Figure 3 As shown, the driving speed regulating unit 240 further includes a speed limiting unit 243 , which is connected between the first acceleration branch and the driving signal transmission unit 210 .

[0103] In this embodiment, a speed limiting unit 243 is introduced at the rear stage of the driving signal transmission unit 210. The speed limiting unit 243 can effectively control the current of the base of the push-pull circuit to prevent the current of the base of the push-pull circuit from being too large under the action of the first acceleration branch, thereby ensuring the stability and safety of the power converter 10.

[0104] It can be understood that the speed limiting unit 243 is connected between the first acceleration branch and the driving signal transmission unit 210, the first switch 241 controls the input and output of the acceleration unit 242 in the first acceleration branch, and the speed limiting unit 243 is always connected to the push-pull circuit.

[0105] In this embodiment, when the first switch 241 is closed and the first acceleration branch is turned on, the driving rate of the power conversion circuit 300 is accelerated; when the first switch 241 is opened and the first acceleration branch is cut off, the driving rate of the power conversion circuit 300 is reduced.

[0106] In some embodiments, Figure 4 As shown, the driving rate adjustment unit 240 includes a first speed limiting branch connected in series with the first resistor 221, the first speed limiting branch includes a speed limiting unit 243 and a first switch 241 in parallel, one end of the first speed limiting branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223, and the other end of the first speed limiting branch is connected to the driving signal transmission unit 210.

[0107] Wherein, when the first speed limiting branch is turned on, it is used to reduce the base current of the push-pull circuit.

[0108] In this embodiment, the parallel speed limiting unit 243 and the first switch 241 form a first speed limiting branch, the first speed limiting branch is connected in series with the first resistor 221, one end of the first speed limiting branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223 through the first resistor 221, and a series branch is set at the base of the push-pull circuit to realize drive rate control.

[0109] In actual implementation, when the first switch 241 is disconnected and the first speed limiting branch is turned on, the driving speed regulating unit 240 having the speed limiting unit 243 is connected to the push-pull circuit, the base current of the push-pull circuit decreases, and the driving speed of the power conversion circuit 300 decreases.

[0110] When the first switch 241 is closed and the first speed limiting branch is bypassed, the driving speed regulating unit 240 having the speed limiting unit 243 is cut out from the push-pull circuit, the base current of the push-pull circuit increases, and the driving speed of the power conversion circuit 300 is accelerated.

[0111] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0112] like Figure 4 As shown, the first switch 241 is disconnected, the first speed limiting branch is turned on, the speed limiting unit 243 is activated, and the power converter 10 is switched to the first driving mode; the first switch 241 is closed, the first speed limiting branch is bypassed, the speed limiting unit 243 is cut out, and the power converter 10 is switched to the second driving mode.

[0113] 2. Shunt the current at the base of the push-pull circuit.

[0114] In some embodiments, one end of the driving speed adjustment unit 240 is connected to the base of the first switching tube 222 and the base of the second switching tube 223, and the other end of the driving speed adjustment unit 240 is connected to the high level end 202 or the low level end 203. The driving speed adjustment unit 240 is used to adjust the base current of the push-pull circuit.

[0115] In this embodiment, one end of the driving speed adjustment unit 240 is connected to the base of the push-pull circuit (i.e., the base of the first switching tube 222 and the base of the second switching tube 223), and the other end of the driving speed adjustment unit 240 is connected to the high level end 202 or the low level end 203. The driving speed adjustment unit 240 shunts the current at the base of the push-pull circuit and shunts the current to the high level end 202 or the low level end 203, thereby changing the current at the load end 201 of the push-pull circuit, affecting the current input from the push-pull circuit to the driving impedance network 230, and realizing the adjustment of the driving speed.

[0116] In some embodiments, the driving rate adjustment unit 240 includes a first shunt branch, the first shunt branch includes a speed limiting unit 243 and a first switch 241 connected in series, one end of the first shunt branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223, and the other end of the first shunt branch is connected to the high level end 202 or the low level end 203.

[0117] like Figure 5 As shown, one end of the first shunt branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223, and the other end of the first shunt branch is connected to the low level end 203, so as to shunt the current at the base of the push-pull circuit to the low level end 203.

[0118] like Figure 6As shown, one end of the first shunt branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223, and the other end of the first shunt branch is connected to the high level end 202, so as to shunt the current at the base of the push-pull circuit to the high level end 202.

[0119] Wherein, when the first shunt branch is turned on, it is used to reduce the base current of the push-pull circuit.

[0120] In this embodiment, the speed limiting unit 243 and the first switch 241 connected in series form a first shunt branch. When the first switch 241 is closed and the first shunt branch is turned on, the driving speed adjustment unit 240 with the speed limiting unit 243 is connected to the push-pull circuit, and the current at the base of the push-pull circuit is shunted to the high level end 202 or the low level end 203, the base current of the push-pull circuit is reduced, and the driving speed of the power conversion circuit 300 is reduced.

[0121] When the first switch 241 is disconnected and the first shunt branch is cut off, the driving speed adjustment unit 240 having the speed limiting unit 243 is cut out from the push-pull circuit, and the current at the base of the push-pull circuit is no longer shunted to the high level end 202 or the low level end 203, the base current of the push-pull circuit increases, and the driving speed of the power conversion circuit 300 is accelerated.

[0122] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0123] like Figure 6 As shown, one end of the first shunt branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223 , and the other end of the first shunt branch is connected to the high level end 202 .

[0124] In this embodiment, the first switch 241 is closed, the first shunt branch is turned on, the speed limiting unit 243 is activated, and the power converter 10 is switched to the first drive mode; the first switch 241 is opened, the first shunt branch is cut off, the speed limiting unit 243 is cut out, and the power converter 10 is switched to the second drive mode.

[0125] 3. Regulate the current at the load end 201 of the push-pull circuit.

[0126] In some embodiments, one end of the driving speed adjustment unit 240 is connected to the load end 201 , and the driving speed adjustment unit 240 is used to adjust the current input to the driving impedance network 230 .

[0127] In this embodiment, one end of the driving speed adjustment unit 240 is connected to the load end 201 , and the current input to the driving impedance network 230 is adjusted from the load end 201 , and the adjustment response rate of the driving speed is faster.

[0128] In some embodiments, Figure 7 As shown, the driving rate adjustment unit 240 includes a second shunt branch, the second shunt branch includes a speed limiting unit 243 and a first switch 241 connected in series, one end of the second shunt branch is connected to the load end 201, and the other end of the second shunt branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223.

[0129] When the second shunt branch is turned on, it is used to reduce the current input to the driving impedance network 230 .

[0130] In this embodiment, the speed limiting unit 243 and the first switch 241 connected in series form a second shunt branch, which can shunt the current input to the base of the push-pull circuit to the load end 201, that is, the current of the driving signal transmission unit 210 flows directly from the second shunt branch into the driving impedance network 230, reducing the amplification effect of the first switch tube 222 and the second switch tube 223 in the push-pull circuit on the current.

[0131] When the first switch 241 is closed and the second shunt branch is turned on, the second shunt branch transmits part of the current of the driving signal transmission unit 210 to the driving impedance network 230, the base current of the push-pull circuit is reduced, and the driving rate of the power conversion circuit 300 is reduced.

[0132] When the first switch 241 is disconnected and the second shunt branch is cut off, the driving speed regulating unit 240 having the speed limiting unit 243 is cut out from the push-pull circuit, the base current of the push-pull circuit increases, and the driving speed of the power conversion circuit 300 is accelerated.

[0133] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0134] like Figure 7 As shown, the first switch 241 is closed, the second shunt branch is turned on, the speed limiting unit 243 is activated, and the power converter 10 is switched to the first driving mode; the first switch 241 is disconnected, the second shunt branch is cut off, the speed limiting unit 243 is cut out, and the power converter 10 is switched to the second driving mode.

[0135] It should be noted that when the amplifying effect of the first switch tube 222 and the second switch tube 223 in the push-pull circuit is strong, the amplifying effect of the first switch tube 222 and the second switch tube 223 on the current in the push-pull circuit can be reduced by setting a second shunt branch to achieve effective control of the driving rate.

[0136] In some embodiments, Figure 8As shown, the driving rate adjustment unit 240 includes a first boost branch, which includes an acceleration unit 242 and a first switch 241 connected in series, one end of the first boost branch is connected to the load end 201, and the other end of the first boost branch is connected to the base of the first switch tube 222 and the base of the second switch tube 223.

[0137] When the first boost branch is turned on, it is used to increase the current input to the driving impedance network 230 .

[0138] In this embodiment, the acceleration unit 242 and the first switch 241 connected in series form a first boost branch, and the current of the driving signal transmission unit 210 flows directly into the driving impedance network 230 from the first boost branch, and the current flowing into the driving impedance network 230 is increased through the acceleration unit 242 in the first boost branch.

[0139] When the first switch 241 is closed and the first boost branch is turned on, the acceleration unit 242 is activated, the current transmitted to the driving impedance network 230 increases, and the driving rate of the power conversion circuit 300 is accelerated.

[0140] When the first switch 241 is disconnected and the first boost branch is cut off, the acceleration unit 242 is cut out of the push-pull circuit, the current transmitted to the driving impedance network 230 is reduced, and the driving rate of the power conversion circuit 300 is reduced.

[0141] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0142] like Figure 8 As shown, the first switch 241 is closed, the first boost branch is turned on, the acceleration unit 242 is activated, and the power converter 10 is switched to the second driving mode; the first switch 241 is disconnected, the first boost branch is cut off, the acceleration unit 242 is cut out, and the power converter 10 is switched to the first driving mode.

[0143] It should be noted that when the amplification effect of the first switch tube 222 and the second switch tube 223 in the push-pull circuit is weak, or the power transistor driving current demand of the power conversion circuit 300 is small, the amplification effect of the push-pull circuit can be increased by setting a first boost branch, thereby effectively improving the driving rate.

[0144] In some embodiments, the driving rate adjustment unit 240 includes a second speed limiting branch, which includes a speed limiting unit 243 and a first switch 241 connected in series, one end of the second speed limiting branch is connected to the load end 201, and the other end of the second speed limiting branch is connected to one of the high level end 202 or the low level end 203.

[0145] For example, Fig. 9As shown, one end of the second speed limiting branch is connected to the load end 201 , and the other end of the second speed limiting branch is connected to the low level end 203 .

[0146] For example, Fig.10 As shown, one end of the second speed limiting branch is connected to the load end 201 , and the other end of the second speed limiting branch is connected to the high level end 202 .

[0147] When the second speed limiting branch is turned on, it is used to reduce the current input to the driving impedance network 230 .

[0148] In this embodiment, the speed limiting unit 243 and the first switch 241 connected in series form a second speed limiting branch. When the first switch 241 is closed and the second speed limiting branch is turned on, the driving speed adjustment unit 240 having the speed limiting unit 243 is connected to the push-pull circuit, the current input to the driving impedance network 230 is reduced, and the driving speed of the power conversion circuit 300 is reduced.

[0149] When the first switch 241 is disconnected and the second speed limiting branch is cut off, the driving speed regulating unit 240 having the speed limiting unit 243 is cut out from the push-pull circuit, and the driving speed of the power conversion circuit 300 increases.

[0150] Take the example that the power converter 10 has a first driving mode with a low driving rate and a second driving mode with a high driving rate.

[0151] like Fig. 9 As shown, one end of the second speed limiting branch is connected to the load end 201, the other end of the second speed limiting branch is connected to the low level end 203, the first switch 241 is closed, the second speed limiting branch is turned on, the speed limiting unit 243 is activated, and the power converter 10 is switched to the first drive mode; the first switch 241 is disconnected, the second speed limiting branch is cut off, the speed limiting unit 243 is cut out, and the power converter 10 is switched to the second drive mode.

[0152] In some embodiments, the push-pull circuit further includes a first capacitor 224 , a second capacitor 225 , a first voltage stabilizing unit 226 , and a second voltage stabilizing unit 227 .

[0153] In this embodiment, the collector of the first switching tube 222 is connected to the first capacitor 224, the collector of the second switching tube 223 is connected to the second capacitor 225, the first capacitor 224 and the second capacitor 225 are connected at a first connection point, the power conversion circuit 300 is connected to the first connection point, the first voltage stabilizing unit 226 is connected in parallel with the first capacitor 224, and the second voltage stabilizing unit 227 is connected in parallel with the second capacitor 225.

[0154] The embodiment of the present application also provides a power converter 10 .

[0155] like Fig.11As shown, the power converter 10 includes: a control circuit 100 , a drive circuit 200 of the power converter 10 as described above, and a power conversion circuit 300 .

[0156] The driving signal transmission unit 210 of the driving circuit 200 is connected to the control circuit 100, and the power conversion circuit 300 is connected to the driving circuit 200. The driving circuit 200 is used to process the driving signal output by the control circuit 100 and output the processed driving signal to the power conversion circuit 300 to drive the power conversion circuit 300 to perform power conversion.

[0157] It can be understood that the control circuit 100, the drive signal transmission unit 210, the push-pull circuit, the drive impedance network 230 and other components work together to achieve effective driving of the power transistor. The control circuit 100 generates a drive signal according to system requirements and operating conditions. The drive signal generated by the control circuit 100 is transmitted to the drive signal transmission unit 210. The drive signal transmission unit 210 processes the drive signal to adapt to different application scenarios. The push-pull circuit converts the input signal into high and low levels that can directly drive the gate of the power transistor. The high and low levels are transmitted through the drive impedance network 230. The gate of the power transistor receives the processed drive signal to achieve switching control of the power transistor.

[0158] In this embodiment, a driving speed adjustment unit 240 is provided in the driving circuit 200, and the driving speed adjustment unit 240 is connected to the push-pull circuit. The driving speed adjustment unit 240 is used to adjust the current of the push-pull circuit and change the current input to the driving impedance network 230 to adjust the driving speed of the driving circuit 200 to drive the power conversion circuit 300.

[0159] In this embodiment, the acceleration unit 242 and the speed limiting unit 243 are components in the driving rate adjustment unit 240 that change the current of the push-pull circuit. These two types of units are combined with the first switch 241, and the driving rate adjustment unit 240 is connected to the push-pull circuit or cut off from the push-pull circuit through the first switch 241, thereby realizing the adjustment effect of the acceleration unit 242 and the speed limiting unit 243 on the current of the push-pull circuit.

[0160] According to the power converter 10 provided in the embodiment of the present application, by setting a drive rate adjustment unit 240, using the first switch 241, the acceleration unit 242, and the speed limiting unit 243, the current input to the drive impedance network 230 by the push-pull circuit is adjusted. The drive rate adjustment has a fast response speed and a strong load capacity, which can ensure the performance and stability of the power converter 10.

[0161] An embodiment of the present application further provides a power supply device, which includes the power converter 10 as described above.

[0162] The power converter 10 of the power supply device is used to realize power conversion between DC voltage and AC voltage. The power supply device can be an inverter, a converter and other devices.

[0163] According to the power supply device provided in the embodiment of the present application, by setting a drive rate adjustment unit 240, utilizing the first switch 241, the acceleration unit 242, and the speed limiting unit 243, the current input to the drive impedance network 230 by the push-pull circuit is adjusted, the drive rate adjustment has a fast response speed and a strong load capacity, and can ensure the performance and stability of the power converter 10 in the power supply device.

[0164] The embodiment of the present application further provides a control method of a power converter 10 , which is applied to the above-mentioned power converter 10 .

[0165] like Fig.12 As shown, the control method of the power converter 10 includes step 1210 , step 1221 and step 1222 .

[0166] Step 1210 : Obtain predicted voltage stress of the power conversion circuit 300 .

[0167] In this embodiment, the predicted voltage stress of the power conversion circuit 300 is the voltage stress that the power transistors in the power conversion circuit 300 are expected to withstand, and can be predicted by the voltage value of the DC bus to which the power conversion circuit 300 is connected.

[0168] In actual implementation, Fig.11 As shown, the power converter 10 has a sampling feedback function (shown by the dotted line in the figure), which measures the DC bus voltage of the power conversion circuit 300 (directly measures the bus voltage, or indirectly measures a voltage proportional to the bus voltage), obtains the voltage information of the DC bus, transmits it to the control circuit 100, and calculates the expected predicted voltage stress of the power transistor.

[0169] For example, the control circuit 100 obtains the DC bus voltage value Vdc, and predicts the voltage stress of the power transistor in combination with experimental data, simulation results or calculation formulas to obtain the predicted voltage stress Vdc+ΔV, where ΔV is the incremental value of the voltage stress.

[0170] The control circuit 100 compares the predicted voltage stress with a preset voltage stress reference threshold, and based on the comparison result, controls the driving circuit 200 to operate in a first driving mode with a low driving rate or a second driving mode with a high driving rate.

[0171] The preset voltage stress reference threshold may include a first stress reference threshold and a second stress reference threshold, the first stress reference threshold is greater than the second stress reference threshold, and the driving rate of the second driving mode is greater than the driving rate of the first driving mode.

[0172] Step 1221 : When the predicted voltage stress is greater than the first stress reference threshold, control the driving circuit 200 to operate in the first driving mode.

[0173] In this step, when the predicted voltage stress is greater than the first stress reference threshold, it indicates that the voltage stress of the power transistor is high. Controlling the drive circuit 200 to operate in the first drive mode and reducing the drive rate can reduce the voltage stress and ensure stable operation of the power converter 10.

[0174] Step 1222: When the predicted voltage stress is less than the second stress reference threshold, control the driving circuit 200 to operate in the second driving mode.

[0175] In this step, when the predicted voltage stress is less than the second stress reference threshold, it indicates that the voltage stress of the power transistor is low. The driving circuit 200 is controlled to operate in the second driving mode, and the driving rate is increased, which can reduce the loss of the power transistor and the driving circuit 200.

[0176] It should be noted that the first stress reference threshold and the second stress reference threshold are obtained based on experiments, simulations or calculation formulas. The first stress reference threshold is greater than the second stress reference threshold. The control of the driving rate exhibits a hysteresis characteristic, which helps to suppress noise interference and enhance the stability of the system.

[0177] In actual implementation, the first stress reference threshold may also be equal to the second stress reference threshold, so as to simplify the comparison logic of the control circuit 100 and quickly adjust the driving rate.

[0178] It is understandable that after obtaining the predicted voltage stress of the power conversion circuit 300 in step 1210, the first driving mode of step 1221 or the second driving mode of step 1222 is entered according to the result of comparing the predicted voltage stress with the preset voltage stress reference threshold.

[0179] For example, Fig.13 As shown, when the driving circuit 200 is in the second driving mode with a high driving rate, if the predicted voltage stress of the power transistor is higher than the first stress reference threshold, the driving circuit 200 is switched to the first driving mode with a low driving rate to reduce the voltage stress. If the predicted voltage stress does not exceed the first stress reference threshold, the driving circuit 200 can continue to operate in the second driving mode with a high driving rate.

[0180] When the driving circuit 200 is in the first driving mode with a low driving rate, if the predicted voltage stress of the power transistor is lower than the second stress reference threshold, the driving circuit 200 is switched to the second driving mode with a high driving rate to reduce the loss of the power transistor and the driving circuit 200. If the predicted voltage stress is not lower than the second stress reference threshold, the driving circuit 200 can continue to operate in the first driving mode with a low driving rate.

[0181] In this embodiment, a driving rate adjustment unit 240 is provided in the driving circuit 200, and the driving rate adjustment unit 240 is connected to the push-pull circuit. The current of the push-pull circuit is adjusted by controlling the driving rate adjustment unit 240 to change the current input to the driving impedance network 230, thereby realizing the control of the driving rate, that is, realizing the switching between the first driving mode and the second driving mode.

[0182] For example, Figure 2 As shown, the first switch 241 is closed, the first acceleration branch is turned on, the acceleration unit 242 is activated, and the power converter 10 is switched to the second driving mode; the first switch 241 is opened, the first acceleration branch is cut off, the acceleration unit 242 is cut out, and the power converter 10 is switched to the first driving mode.

[0183] According to the control method of the power converter 10 provided in the embodiment of the present application, by comparing the predicted voltage stress with the preset reference threshold, the power converter 10 is controlled to operate in a driving mode with different driving speeds according to the comparison result, with high stability and strong adaptability. The driving speed is controlled by the driving speed adjustment unit 240 to switch the driving mode of the power converter 10. The driving speed adjustment has a fast response speed and a strong load capacity, which can ensure the performance and stability of the power converter 10.

[0184] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the control method embodiment of the above-mentioned power converter 10 are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0185] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0186] An embodiment of the present application further provides a computer program product, including a computer program, which implements the control method of the power converter 10 when executed by a processor.

[0187] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0188] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the control method embodiment of the above-mentioned power converter 10, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0189] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0190] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0191] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0192] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0193] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0194] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A driving circuit for a power converter, characterized in that: include: A driving signal transmission unit; A push-pull circuit, the push-pull circuit comprising a first resistor, a first switch tube and a second switch tube, one end of the first resistor is connected to the drive signal transmission unit, the other end of the first resistor is connected to the base of the first switch tube and the base of the second switch tube, the emitter of the first switch tube and the emitter of the second switch tube are connected to form a load end, the collector of the first switch tube forms a high level end, and the collector of the second switch tube forms a low level end; A driving impedance network, one end of which is connected to the load end, and the other end of which is used to be connected to a power conversion circuit of a power converter; a driving rate regulating unit, the driving rate regulating unit being connected to the push-pull circuit, the driving rate regulating unit comprising a first switch, the first switch being used to connect the driving rate regulating unit to the push-pull circuit or to disconnect the driving rate regulating unit from the push-pull circuit, the driving rate regulating unit comprising at least one of an accelerating unit and a speed limiting unit, the accelerating unit being used to increase the current of the push-pull circuit, and the speed limiting unit being used to reduce the current of the push-pull circuit; The driving rate adjustment unit is used to adjust the current of the push-pull circuit, change the current input to the driving impedance network, and adjust the driving rate of the driving circuit driving the power conversion circuit.

2. The driving circuit of the power converter according to claim 1, characterized in that: One end of the driving speed adjustment unit is connected to the base of the first switching tube and the base of the second switching tube, and the other end of the driving speed adjustment unit is connected to the driving signal transmission unit. The driving speed adjustment unit is used to adjust the base current of the push-pull circuit.

3. The driving circuit of the power converter according to claim 2, characterized in that: The driving rate adjustment unit includes a first acceleration branch connected in parallel with the first resistor, the first acceleration branch includes the acceleration unit and the first switch connected in series, one end of the first acceleration branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first acceleration branch is connected to the driving signal transmission unit; Wherein, when the first acceleration branch is turned on, it is used to increase the base current of the push-pull circuit.

4. The driving circuit of the power converter according to claim 3, characterized in that: The driving speed regulating unit further comprises the speed limiting unit, and the speed limiting unit is connected between the first accelerating branch and the driving signal transmitting unit.

5. The driving circuit of the power converter according to claim 2, characterized in that: The driving speed regulating unit comprises a first speed limiting branch connected in series with the first resistor, the first speed limiting branch comprises the speed limiting unit and the first switch connected in parallel, one end of the first speed limiting branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first speed limiting branch is connected to the driving signal transmission unit; Wherein, when the first speed limiting branch is turned on, it is used to reduce the base current of the push-pull circuit.

6. The driving circuit of the power converter according to claim 1, characterized in that: One end of the driving speed adjustment unit is connected to the base of the first switching tube and the base of the second switching tube, and the other end of the driving speed adjustment unit is connected to the high level end or the low level end. The driving speed adjustment unit is used to adjust the base current of the push-pull circuit.

7. The driving circuit of the power converter according to claim 6, characterized in that: The driving rate regulating unit comprises a first shunt branch, the first shunt branch comprises the speed limiting unit and the first switch connected in series, one end of the first shunt branch is connected to the base of the first switch tube and the base of the second switch tube, and the other end of the first shunt branch is connected to the high level end or the low level end; Wherein, when the first shunt branch is turned on, it is used to reduce the base current of the push-pull circuit.

8. The driving circuit of the power converter according to claim 1, characterized in that: One end of the driving speed adjustment unit is connected to the load end, and the driving speed adjustment unit is used to adjust the current input to the driving impedance network.

9. The driving circuit of the power converter according to claim 8, characterized in that: The driving speed regulating unit comprises a second shunt branch, the second shunt branch comprises the speed limiting unit and the first switch connected in series, one end of the second shunt branch is connected to the load end, and the other end of the second shunt branch is connected to the base of the first switch tube and the base of the second switch tube; Wherein, when the second shunt branch is turned on, it is used to reduce the current input to the driving impedance network.

10. The driving circuit of the power converter according to claim 8, characterized in that: The driving rate regulating unit comprises a first boosting branch, the first boosting branch comprises the acceleration unit and the first switch connected in series, one end of the first boosting branch is connected to the load end, and the other end of the first boosting branch is connected to the base of the first switch tube and the base of the second switch tube; Wherein, when the first boost branch is turned on, it is used to increase the current input to the driving impedance network.

11. The driving circuit of the power converter according to claim 8, characterized in that: The driving speed regulating unit comprises a second speed limiting branch, the second speed limiting branch comprises the speed limiting unit and the first switch connected in series, one end of the second speed limiting branch is connected to the load end, and the other end of the second speed limiting branch is connected to one of the high level end or the low level end; Wherein, when the second speed limiting branch is turned on, it is used to reduce the current input to the driving impedance network.

12. The driving circuit of the power converter according to any one of claims 1 to 11, characterized in that: The acceleration unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device and a bidirectional conductive device.

13. The driving circuit of the power converter according to any one of claims 1 to 11, characterized in that: The speed limiting unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device and a bidirectional conductive device.

14. The driving circuit of the power converter according to any one of claims 1 to 11, characterized in that: The push-pull circuit also includes a first capacitor, a second capacitor, a first voltage stabilizing unit and a second voltage stabilizing unit. The collector of the first switching tube is connected to the first capacitor, the collector of the second switching tube is connected to the second capacitor, the first capacitor and the second capacitor are connected at a first connection point, the power conversion circuit is connected to the first connection point, the first voltage stabilizing unit is connected in parallel with the first capacitor, and the second voltage stabilizing unit is connected in parallel with the second capacitor.

15. A power converter, characterized in that: include: Control circuit; The driving circuit of the power converter according to any one of claims 1 to 14, wherein the driving signal transmission unit of the driving circuit is connected to the control circuit; A power conversion circuit is connected to the drive circuit, and the drive circuit is used to process the drive signal output by the control circuit and output the processed drive signal to the power conversion circuit to drive the power conversion circuit to perform power conversion.

16. A power supply device, characterized in that: Comprising the power converter as claimed in claim 14.

17. A control method for a power converter, characterized in that: The method is applied to the power converter according to claim 15, and the method comprises: Obtaining predicted voltage stress of a power conversion circuit; When the predicted voltage stress is greater than a first stress reference threshold, controlling the driving circuit to operate in a first driving mode; When the predicted voltage stress is less than a second stress reference threshold, the driving circuit is controlled to operate in a second driving mode, the first stress reference threshold is greater than the second stress reference threshold, and the driving rate of the second driving mode is greater than the driving rate of the first driving mode.

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