Power converter

Abstract

According to the power converter provided by the invention, a voltage stabilizing circuit is connected in parallel with a driving power supply in a driving circuit, the voltage stabilizing circuit comprises a first switching tube and a first voltage stabilizing tube which are connected in series between a power supply voltage output end and a reference voltage output end, and the on-off state of the first switching tube is controlled; the state that the first voltage-regulator tube is switched in and out of the driving power supply can be switched, so that the voltage-stabilizing conversion control of the power supply voltage provided by the driving power supply is realized. Because the control circuit generates the on-off voltage of the driving signal sent to the switching tube in the power conversion circuit according to the power supply voltage, the conversion of the on-off voltage of the driving signal can be realized by converting the power supply voltage, so that the switching speed of the switching tube in the power conversion circuit is changed, and when the on-off voltage of the driving signal is reduced, the on-off voltage of the driving signal is reduced. The peak voltage of the switching tube can be reduced, the switching speed of the switching tube can be increased when the on-off voltage of the driving signal is increased, and the loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a power converter. Background Art

[0002] At present, the switching devices used in high-power converters in the power electronics industry, such as insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field effect transistors (MOSFETs), require external voltage to drive them to conduct. The magnitude of the driving voltage directly determines the switching speed of the switch, which in turn directly affects key characteristics such as switching loss and switching stress. In order to reduce the switching loss of the switch and improve the overall efficiency of the power converter, a higher driving voltage is generally selected to accelerate the speed at which the switch switches between on and off. In some application scenarios, such as photovoltaic inverters, due to the wide range of input voltage, under high input voltage conditions, faster switching speeds will bring greater voltage spike stress, and under low input voltage conditions, lower switching speeds will bring greater switching losses, directly leading to reduced efficiency. Therefore, how to solve this problem has become the key to improving product competitiveness and ensuring product reliability. Summary of the invention

[0003] The present application provides a power converter, which is used to solve the voltage spike and loss problems of the switch tube in the power converter under a wider input voltage condition.

[0004] In a first aspect, the present application provides a power converter, including a power conversion circuit and a drive circuit, the power conversion circuit includes at least one switch tube, the drive circuit is used to send a drive signal to the switch tube in the power conversion circuit, and the drive signal is used to control the on-off state of the switch tube. Among them, the drive circuit specifically includes a drive power supply and a voltage stabilizing circuit. The drive power supply includes a power supply voltage output terminal and a reference voltage output terminal, and the drive power supply is used to provide a power supply voltage between the power supply voltage output terminal and the reference voltage output terminal. Specifically, the power supply voltage can be provided to the control circuit, and the control circuit generates an on-off voltage of the drive signal according to the power supply voltage. The control circuit sends the drive signal to the control end of the switch tube to control the on-off state of the switch tube. The voltage stabilizing circuit includes a first switch tube and a first voltage stabilizing tube, and the first switch tube and the first voltage stabilizing tube are connected in series between the power supply voltage output terminal and the reference voltage output terminal. The stabilizing circuit is used to convert the voltage value of the power supply voltage and stabilize the voltage value of the power supply voltage. Specifically, when the first switch tube is disconnected, the voltage stabilizing circuit is in an exit state, that is, the first voltage stabilizing tube is set to float, so that the power supply voltage output between the power supply voltage output terminal and the reference voltage output terminal remains at a rated fixed value or range value. When the first switch tube is turned on, the voltage stabilizing circuit is in the input state, that is, the first voltage stabilizing tube and the driving power supply form a parallel relationship, so that the power supply voltage output between the power supply voltage output terminal and the reference voltage output terminal is converted to a fixed voltage stabilizing value of the first voltage stabilizing tube, realizing the conversion of the output power supply voltage and stabilizing the power supply voltage to a fixed value, thereby driving the conversion of the on-off voltage of the driving signal according to the conversion of the power supply voltage to change the switching speed of the switch tube in the power conversion circuit. Specifically, under the condition of high input voltage, the peak voltage of the switch tube can be reduced by reducing the on-off voltage of the driving signal by converting the power supply voltage; under the condition of low input voltage, the on-off voltage of the driving signal can be increased by converting the power supply voltage, which can increase the switching speed of the switch tube and reduce the loss.

[0005] In some embodiments of the present application, in order to achieve a stable power supply voltage of a fixed value when the voltage stabilizing circuit is in an exit state, the driving power supply may also include a second voltage stabilizing tube and a voltage dividing capacitor connected in parallel between the power supply voltage output terminal and the reference voltage output terminal, and the voltage stabilizing value of the second voltage stabilizing tube needs to be greater than the voltage stabilizing value of the first voltage stabilizing tube. When the first switch tube is turned off, the voltage value of the power supply voltage is the voltage stabilizing value of the second voltage stabilizing tube. In this way, when the first switch tube is disconnected, the voltage stabilizing circuit is in an exit state, that is, the first voltage stabilizing tube is set to float, and the second voltage stabilizing tube keeps the power supply voltage output between the power supply voltage output terminal and the reference voltage output terminal at a fixed voltage stabilizing value of the second voltage stabilizing tube. When the first switch tube is turned on, the voltage stabilizing circuit is in an input state, that is, the first voltage stabilizing tube and the driving power supply form a parallel relationship, so that the power supply voltage output between the power supply voltage output terminal and the reference voltage output terminal is converted to a fixed voltage stabilizing value of the first voltage stabilizing tube. By changing the on-off state of the first switch tube, the output power supply voltage is transformed and stabilized, thereby driving the on-off voltage of the driving signal to change according to the change of the power supply voltage, so as to change the switching speed of the switch tube in the power conversion circuit.

[0006] In the present application, the type of power supply voltage required for stabilization and control can be determined according to the type of switch tube used in the power conversion circuit. For example: when the switch tube adopts IGBT, the on-voltage of the drive signal is a positive voltage and the off-voltage is a negative voltage. The drive power supply needs to provide a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit generates the on-voltage of the IGBT drive signal according to the positive power supply voltage. In addition, the drive power supply also needs to provide a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit generates the off-voltage of the IGBT drive signal according to the negative power supply voltage. According to the needs, the conversion of the positive power supply voltage and the stabilization of the positive power supply voltage can be controlled separately, the conversion of the negative power supply voltage and the stabilization of the negative power supply voltage can be controlled separately, and both the positive power supply voltage and the negative power supply voltage can be controlled at the same time. For example: when the switch tube adopts N-type MOSFET, the on-voltage of the NMOS drive signal is a positive voltage and the off-voltage is a reference voltage. The drive power supply only needs to provide a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit generates the on-voltage of the NMOS drive signal according to the positive power supply voltage. The conversion of the positive voltage of the power supply and the stabilization of the positive voltage of the power supply can be controlled separately as needed. When the switch tube adopts P-type MOSFET, the on-voltage of the PMOS drive signal is a negative voltage and the off-voltage is a reference voltage. The drive power supply only needs to provide the negative voltage of the power supply between the negative voltage output terminal and the reference voltage output terminal. The control circuit generates the on-voltage of the PMOS drive signal according to the negative voltage of the power supply. The conversion of the negative voltage of the power supply and the stabilization of the negative voltage of the power supply can be controlled separately as needed.

[0007] In some embodiments of the present application, the power supply voltage output terminal specifically includes a positive voltage output terminal, the driving power supply is used to provide a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit generates a conduction voltage of the driving signal according to the positive power supply voltage. The voltage stabilizing circuit can specifically perform voltage conversion and stabilization on the positive power supply voltage to achieve the conduction voltage conversion of the driving signal. Specifically, the first switch tube and the first voltage regulator tube are connected in series between the positive voltage output terminal and the reference voltage output terminal, and the second voltage regulator tube and the voltage dividing capacitor are connected in parallel between the positive voltage output terminal and the reference voltage output terminal. When the first switch tube is disconnected, the voltage stabilizing circuit is in an exit state, that is, the first voltage regulator tube is set to float, and the second voltage regulator tube keeps the positive power supply voltage at a fixed voltage regulator value of the second voltage regulator tube. When the first switch tube is turned on, the voltage stabilizing circuit is in an input state, that is, the first voltage regulator tube and the second voltage regulator tube form a parallel relationship, so that the positive power supply voltage is converted to a fixed voltage regulator value of the first voltage regulator tube, thereby achieving voltage conversion and stabilization of the positive power supply voltage, thereby achieving the conduction voltage conversion and stabilization of the drive signal. For example, when the turn-on peak voltage is large, the positive voltage of the power supply can be reduced by turning on the first switch tube and inputting the first voltage regulator tube, thereby reducing the turn-on voltage of the drive signal to reduce the turn-on peak voltage of the switch tube. When it is necessary to reduce the loss, the positive voltage of the power supply can be increased by turning off the first switch tube and setting the first voltage regulator tube to float, thereby increasing the turn-on voltage of the drive signal to speed up the turn-on speed of the switch tube and reduce the loss.

[0008] In the above embodiment, if the power conversion circuit uses IGBT as a switch tube, the power supply voltage output terminal also needs to include a negative voltage output terminal, and the driving power supply also needs to provide a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit generates a turn-off voltage of the driving signal according to the negative power supply voltage. The voltage difference between the positive voltage output terminal and the negative voltage output terminal is a fixed value, and the negative power supply voltage changes with the change of the positive power supply voltage. The driving power supply may also include a voltage dividing resistor and a voltage dividing capacitor connected in parallel between the negative voltage output terminal and the reference voltage output terminal. The negative power supply voltage decreases with the decrease of the positive power supply voltage. When the first switching tube is turned on and the first voltage regulator tube is put into operation, the negative power supply voltage is reduced on the basis of reducing the positive power supply voltage to reduce the turn-on voltage of the driving signal to reduce the turn-on peak voltage of the switching tube, thereby reducing the turn-off voltage of the driving signal, and the turn-off speed of the switching tube can be improved. When the first switch tube is turned off and the first voltage regulator tube is set to float, the negative power supply voltage can be increased on the basis of increasing the positive power supply voltage to increase the on-voltage of the drive signal to speed up the conduction speed of the switch tube and reduce the loss, thereby increasing the off-voltage of the drive signal and reducing the off-peak voltage of the switch tube.

[0009] In some embodiments of the present application, the power supply voltage output terminal specifically includes a negative voltage output terminal, the driving power supply is used to provide a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit generates a turn-off voltage of the driving signal according to the negative power supply voltage. The voltage stabilizing circuit can specifically perform voltage conversion and stabilization on the negative power supply voltage to achieve the turn-off voltage conversion of the driving signal. Specifically, the first switch tube and the first voltage regulator tube are connected in series between the negative voltage output terminal and the reference voltage output terminal, and the second voltage regulator tube and the voltage dividing capacitor are connected in parallel between the negative voltage output terminal and the reference voltage output terminal. When the first switch tube is disconnected, the voltage stabilizing circuit is in an exit state, that is, the first voltage regulator tube is set to float, and the second voltage regulator tube keeps the negative power supply voltage at a fixed voltage regulator value of the second voltage regulator tube. When the first switch tube is turned on, the voltage stabilizing circuit is in an input state, that is, the first voltage regulator tube and the second voltage regulator tube form a parallel relationship, so that the negative power supply voltage is converted to a fixed voltage regulator value of the first voltage regulator tube, thereby achieving voltage conversion and stabilization of the negative power supply voltage, thereby achieving turn-off voltage conversion and stabilization of the drive signal. For example, when the turn-off peak voltage is large, the absolute value of the negative voltage of the power supply can be reduced by turning on the first switch tube and inputting the first voltage regulator tube, thereby reducing the absolute value of the turn-off voltage of the drive signal to reduce the turn-off peak voltage of the switch tube. When it is necessary to reduce the loss, the absolute value of the negative voltage of the power supply can be increased by turning off the first switch tube and setting the first voltage regulator tube to float, thereby increasing the absolute value of the turn-off voltage of the drive signal to speed up the turn-off speed of the switch tube and reduce the loss.

[0010] In the above embodiment, if the power conversion circuit uses IGBT as a switch tube, the power supply voltage output terminal also needs to include a positive voltage output terminal, and the driving power supply also needs to provide a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit generates a turn-on voltage of the driving signal according to the positive power supply voltage. The voltage difference between the positive voltage output terminal and the negative voltage output terminal is a fixed value, and the positive power supply voltage changes with the change of the negative power supply voltage. The driving power supply may also include a voltage dividing resistor and a voltage dividing capacitor connected in parallel between the positive voltage output terminal and the reference voltage output terminal. The positive power supply voltage increases with the increase of the negative power supply voltage. When the first switch tube is turned on and the first voltage regulator tube is put into operation, the positive power supply voltage is increased on the basis of increasing the negative power supply voltage to increase the turn-on voltage of the driving signal to reduce the turn-off peak voltage of the switch tube, thereby increasing the turn-on voltage of the driving signal, and the turn-on speed of the switch tube can be improved. When the first switch tube is turned off and the first voltage regulator tube is set to float, the positive voltage of the power supply can be increased on the basis of reducing the negative voltage of the power supply and reducing the turn-off voltage of the drive signal to speed up the turn-off speed of the switch tube and reduce losses, thereby increasing the on-state voltage of the drive signal and reducing the on-state peak voltage of the switch tube.

[0011] In some embodiments of the present application, the power supply voltage output terminal specifically includes a positive voltage output terminal and a negative voltage output terminal, the driving power supply is used to provide a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and to provide a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, the control circuit generates a turn-on voltage of the driving signal according to the positive power supply voltage, and the control circuit generates a turn-off voltage of the driving signal according to the negative power supply voltage. The voltage stabilizing circuit includes two groups of first switch tubes and first voltage stabilizing tubes, one group of first switch tubes and first voltage stabilizing tubes are connected in series between the positive voltage output terminal and the reference voltage output terminal; the other group of first switch tubes and first voltage stabilizing tubes are connected in series between the negative voltage output terminal and the reference voltage output terminal. The voltage stabilizing value of the first voltage stabilizing tube can be set to any value as needed, and the two can be the same or different, and the voltage difference between the positive voltage output terminal and the negative voltage output terminal is a fixed value. When one first switch tube is turned on and the other first switch tube is turned off, the positive voltage or the negative voltage of the power supply is controlled to be a fixed voltage value of the first voltage regulator tube, thereby realizing voltage conversion and stabilization of the positive voltage or the negative voltage of the power supply, thereby realizing on-voltage or off-voltage conversion and stabilization of the drive signal. When the two first switch tubes are turned on at the same time, the positive voltage and the negative voltage of the power supply are controlled to fixed values ​​at the same time, thereby realizing simultaneous voltage conversion and stabilization of the positive voltage and the negative voltage of the power supply, thereby realizing on-off voltage conversion and stabilization of the drive signal.

[0012] In the above embodiment, the driving power supply may also include two groups of voltage divider resistors and voltage divider capacitors, wherein one group of voltage divider resistors and voltage divider capacitors are connected in parallel between the positive voltage output terminal and the reference voltage output terminal, so as to realize that when the positive voltage of the power supply is controllably stable, the negative voltage of the power supply changes along with the change of the positive voltage of the power supply; and the other group of voltage divider resistors and voltage divider capacitors are connected in parallel between the negative voltage output terminal and the reference voltage output terminal, so as to realize that when the negative voltage of the power supply is controllably stable, the positive voltage of the power supply changes along with the change of the negative voltage of the power supply.

[0013] In some embodiments of the present application, the voltage stabilizing circuit may generally further include a current limiting resistor, which is connected in series between the first switch tube and the first voltage stabilizing tube, and can limit the current flowing through the first switch tube, thereby protecting the first switch tube from overcurrent.

[0014] In some embodiments of the present application, the voltage stabilizing circuit may generally further include a filter device, the filter device is connected to the control end of the first switch tube, and the filter device includes at least one of a filter capacitor, a filter resistor, and a filter diode. Specifically, the control end of the first switch tube is used to receive a control signal to control the on / off state of the first switch tube, and the filter device can filter the control signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A schematic diagram of the circuit structure of a power converter provided in an embodiment of the present application;

[0016] Figure 2 A schematic diagram of a circuit structure of a power converter provided in Embodiment 1;

[0017] Figure 3a Another schematic diagram of the circuit structure of the power converter provided in the first embodiment;

[0018] Figure 3b Another schematic diagram of the circuit structure of the power converter provided in the first embodiment;

[0019] Figure 4 A schematic diagram of a circuit structure of a power converter provided in Embodiment 2;

[0020] Figure 5a Another schematic diagram of the circuit structure of the power converter provided in the second embodiment;

[0021] Figure 5b Another schematic diagram of the circuit structure of the power converter provided in the second embodiment;

[0022] Figure 6 A schematic diagram of a circuit structure of a power converter provided in Embodiment 3;

[0023] Figure 7a Another schematic diagram of the circuit structure of the power converter provided in the third embodiment;

[0024] Figure 7b Another schematic diagram of the circuit structure of the power converter provided in the third embodiment;

[0025] Figure 7c This is another schematic diagram of the circuit structure of the power converter provided in the third embodiment. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes may be made as needed, and all changes are included in the scope of protection of this application. The drawings of this application are only used to illustrate the relative position relationship and do not represent the true proportions.

[0027] It should be noted that specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific implementation methods disclosed below. The subsequent description of the specification is a preferred implementation method for implementing the present application, but the description is for the purpose of illustrating the general principles of the present application and is not intended to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0028] In order to facilitate understanding of the embodiments of the present application, the relevant technologies involved in the embodiments of the present application are first introduced below.

[0029] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of" and "the" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context. It should also be understood that in the following embodiments of the present application, "at least one" refers to one, two or more than two.

[0030] References to "one embodiment" and the like described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in other embodiments", etc. that appear at different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] In the prior art, without changing the driving voltage output by the driving circuit, the driving resistance of the line between the driving circuit and the control end of the switch tube is changed by connecting a resistor switching control circuit in series on the output loop of the driving circuit, thereby changing the driving voltage input to the control end of the switch tube, thereby controlling the switching speed of the switch tube. For some switch tubes with relatively large driving internal resistance, changing the driving resistance can only slow down the switching speed of the switch tube, but cannot speed up the switching speed of the switch tube. Moreover, since multiple switch tubes cannot share the driving resistance, when more switch tubes are used in the power converter, it is necessary to add a resistor switching control circuit for each switch tube, which will cause a significant increase in cost.

[0032] Based on this, the power converter provided in the present application adds a controllable voltage stabilizing circuit in parallel with the driving power supply in the driving circuit, so as to achieve the change of the output driving voltage of the driving circuit under different input voltage conditions by switching the input and output states of the voltage stabilizing circuit, that is, switching whether the voltage stabilizing circuit is connected in parallel with the driving power supply, thereby changing the switching speed of the switching tube.

[0033] The power converter provided in the present application is suitable for power conversion scenarios with a wide input voltage range, such as the power converter used as a photovoltaic inverter to convert the direct current input of the photovoltaic module into alternating current output, and the power converter used as a direct current to direct current (DCDC) power supply.

[0034] Reference Figure 1 , the power converter provided in the present application specifically includes: a power conversion circuit and a driving circuit, the power conversion circuit includes at least one switch tube, the driving circuit is used to send a driving signal to the switch tube in the power conversion circuit, and the driving signal is used to control the on-off state of the switch tube. Among them, the driving circuit specifically includes a driving power supply, a voltage stabilizing circuit and a control circuit. The driving power supply includes a power supply voltage output terminal Vout and a reference voltage output terminal BUS-, and the driving power supply is used to provide a power supply voltage between the power supply voltage output terminal Vout and the reference voltage output terminal BUS-, and specifically provides the power supply voltage to the control circuit, and the control circuit generates an on-off voltage of the driving signal according to the power supply voltage, and the control circuit sends the driving signal to the control end of the switch tube to control the on-off state of the switch tube. The voltage stabilizing circuit includes a first switch tube K1 and a first voltage stabilizing tube Z1, and the first switch tube K1 and the first voltage stabilizing tube Z1 are connected in series between the power supply voltage output terminal Vout and the reference voltage output terminal BUS-. The stabilizing circuit is used to convert the voltage value of the power supply voltage and stabilize the voltage value of the power supply voltage. Specifically, when the first switch tube K1 is disconnected, the voltage stabilizing circuit is in an exit state, that is, the first voltage stabilizing tube Z1 is set to float, so that the power supply voltage output between the power supply voltage output terminal Vout and the reference voltage output terminal BUS- is maintained at a rated fixed value or range value. When the first switch tube K1 is turned on, the voltage stabilizing circuit is in an input state, that is, the first voltage stabilizing tube Z1 and the driving power supply form a parallel relationship, so that the voltage value of the power supply voltage output between the power supply voltage output terminal Vout and the reference voltage output terminal BUS- is converted to a fixed voltage stabilizing value of the first voltage stabilizing tube Z1, and the output power supply voltage is converted and the power supply voltage is stabilized to a fixed value, thereby driving the conversion of the on-off voltage of the driving signal according to the conversion of the power supply voltage, so as to change the switching speed of the switch tube in the power conversion circuit. Specifically, under the condition of inputting high voltage, by converting the power supply voltage to reduce the on-off voltage of the driving signal, the peak voltage of the switch tube can be reduced; under the condition of inputting low voltage, by converting the power supply voltage to increase the on-off voltage of the driving signal, the switching speed of the switch tube can be increased and the loss can be reduced.

[0035] Reference Figure 1 In some embodiments of the present application, in order to achieve a stable power supply voltage of a fixed value when the voltage stabilizing circuit is in the exit state, the driving power supply may also include a second voltage stabilizing tube Z2 and a voltage dividing capacitor C1 connected in parallel between the power supply voltage output terminal Vout and the reference voltage output terminal BUS-, and the voltage stabilizing value of the second voltage stabilizing tube Z2 needs to be greater than the voltage stabilizing value of the first voltage stabilizing tube Z1. When the first switch tube K1 is turned off, the voltage value of the power supply voltage is the voltage stabilizing value of the second voltage stabilizing tube Z2. In this way, when the first switch tube K1 is disconnected, the voltage stabilizing circuit is in the exit state, that is, the first voltage stabilizing tube Z1 is set to float, and the second voltage stabilizing tube Z2 keeps the power supply voltage output between the power supply voltage output terminal Vout and the reference voltage output terminal BUS-at the fixed voltage stabilizing value of the second voltage stabilizing tube Z2. When the first switch tube K1 is turned on, the voltage stabilizing circuit is in the input state, that is, the first voltage stabilizing tube Z1 and the driving power supply form a parallel relationship, so that the power supply voltage output between the power supply voltage output terminal Vout and the reference voltage output terminal BUS- is converted to the fixed voltage stabilizing value of the first voltage stabilizing tube Z1. By changing the on-off state of the first switch tube K1, the output power supply voltage is transformed and stabilized, thereby driving the on-off voltage of the driving signal to change according to the change of the power supply voltage, so as to change the switching speed of the switch tube in the power conversion circuit.

[0036] Reference Figure 1 In some embodiments of the present application, the voltage stabilizing circuit may generally further include a current limiting resistor Rr, which is connected in series between the first switch tube K1 and the first voltage stabilizing tube Z1, and can limit the current flowing through the first switch tube K1, thereby protecting the first switch tube K1 from overcurrent.

[0037] Reference Figure 1 In some embodiments of the present application, the voltage stabilizing circuit may further include a filter device, which is connected to the control end of the first switch tube K1, and includes at least one of a filter capacitor Cc, a filter resistor Rc, and a filter diode Dc. Specifically, the control end of the first switch tube K1 is used to receive a control signal to control the on / off state of the first switch tube K1, and the filter device may filter the control signal.

[0038] In the present application, the type of power supply voltage required for stabilization and control can be determined according to the type of switch tube used in the power conversion circuit. For example: when the switch tube adopts IGBT, the on-voltage of the drive signal is a positive voltage and the off-voltage is a negative voltage. The drive power supply needs to provide a positive power supply voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the control circuit generates the on-voltage of the IGBT drive signal according to the positive power supply voltage V1. In addition, the drive power supply also needs to provide a negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the control circuit generates the off-voltage of the IGBT drive signal according to the negative power supply voltage V2. According to the needs, the transformation of the positive power supply voltage V1 and the stabilization of the positive power supply voltage V1 can be controlled separately, the transformation of the negative power supply voltage V2 and the stabilization of the negative power supply voltage V2 can be controlled separately, and both the positive power supply voltage V1 and the negative power supply voltage V2 can be controlled at the same time. Another example: when the switch tube adopts N-type MOSFET, the on-voltage of the NMOS drive signal is a positive voltage and the off-voltage is a reference voltage. The drive power supply only needs to provide the positive power supply voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the control circuit generates the on-voltage of the NMOS drive signal according to the positive power supply voltage V1. The transformation of the positive power supply voltage V1 and the stabilization of the positive power supply voltage V1 can be controlled separately as needed. When the switch tube adopts P-type MOSFET, the on-voltage of the PMOS drive signal is a negative voltage and the off-voltage is a reference voltage. The drive power supply only needs to provide the negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the control circuit generates the on-voltage of the PMOS drive signal according to the negative power supply voltage V2. The transformation of the negative power supply voltage V2 and the stabilization of the negative power supply voltage V2 can be controlled separately as needed.

[0039] The power converter provided in the embodiment of the present application is introduced below by taking different types of power supply voltages that need to be controlled as examples.

[0040] Embodiment 1:

[0041] Reference Figure 2In this embodiment, the power supply voltage output terminal Vout specifically includes a positive voltage output terminal VCC, the driving power supply is used to provide a positive power supply voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the control circuit generates a conduction voltage of the driving signal according to the positive power supply voltage V1. The voltage stabilizing circuit can specifically perform voltage conversion and stabilization on the positive power supply voltage V1 to achieve the conduction voltage conversion of the driving signal. Specifically, the first switch tube K1 and the first voltage regulator tube Z1 are connected in series between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, the second voltage regulator tube Z2 and the voltage dividing capacitor C1 are connected in parallel between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the filter device can be connected between the control end of the first switch tube K1 and the reference voltage output terminal BUS-. The voltage stabilization value of the first voltage regulator tube Z1 is less than the voltage stabilization value of the second voltage regulator tube Z2. For example, the first voltage regulator tube Z1 can use a voltage regulator tube with a voltage stabilization value of 10V, and the second voltage regulator tube Z2 can use a voltage regulator tube with a voltage stabilization value of 16V. When the first switch tube K1 is disconnected, the voltage stabilizing circuit is in the exit state, that is, the first voltage stabilizing tube Z1 is set to float, and the second voltage stabilizing tube Z2 keeps the positive voltage V1 of the power supply at the fixed voltage stabilizing value of the second voltage stabilizing tube Z2. Specifically, the positive voltage V1 of the power supply is stabilized at the voltage stabilizing value of the second voltage stabilizing tube Z2, that is, V1=16V. When the first switch tube K1 is turned on, the voltage stabilizing circuit is in the input state, that is, the first voltage stabilizing tube Z1 and the second voltage stabilizing tube Z2 are connected in parallel, so that the positive voltage V1 of the power supply is converted to the fixed voltage stabilizing value of the first voltage stabilizing tube Z1. Specifically, the positive voltage V1 of the power supply is converted to the voltage stabilizing value of the first voltage stabilizing tube Z1, that is, V1=10V, thereby realizing the voltage conversion and stabilization of the positive voltage V1 of the power supply, thereby realizing the conversion and stabilization of the conduction voltage of the drive signal. Exemplarily, when the conduction peak voltage is large, by turning on the first switch tube K1 and putting the first voltage stabilizing tube Z1 into use, the positive voltage V1 of the power supply can be reduced, thereby reducing the conduction voltage of the drive signal to reduce the conduction peak voltage of the switch tube. When the loss needs to be reduced, the first switch tube K1 is turned off and the first voltage regulator tube Z1 is floated, so that the positive voltage V1 of the power supply can be increased, thereby increasing the conduction voltage of the driving signal to speed up the conduction speed of the switch tube and reduce the loss.

[0042] Reference Figure 2In this embodiment, if the power conversion circuit uses IGBT as a switch tube, the power supply voltage output terminal Vout also needs to include a negative voltage output terminal VEE, and the driving power supply also needs to provide a negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the control circuit generates a shutdown voltage of the driving signal according to the negative power supply voltage V2. The voltage difference between the positive voltage output terminal VCC and the negative voltage output terminal VEE is a fixed value, for example, it can be 25V, and the negative power supply voltage V2 changes with the change of the positive power supply voltage V1. Then the driving power supply can also include a voltage dividing resistor R2 and a voltage dividing capacitor C2 connected in parallel between the negative voltage output terminal VEE and the reference voltage output terminal BUS-. When the first switch tube K1 is disconnected, the positive power supply voltage V1 is stabilized at the voltage stabilization value of the second voltage regulator tube Z2, that is, V1=16V, and the negative power supply voltage V2=-(VCC-VEE-16V)=-9V. When the first switch tube K1 is turned on, the positive power supply voltage V1 becomes stable at the voltage value of the first voltage regulator tube Z1, that is, V1=10V, and the negative power supply voltage V2=-(VCC-VEE-10V)=-15V. The negative power supply voltage V2 decreases with the decrease of the positive power supply voltage V1. When the first switch tube K1 is turned on and the first voltage regulator tube Z1 is put into operation, the negative power supply voltage V2 is reduced on the basis of reducing the positive power supply voltage V1 to reduce the on-voltage of the drive signal to reduce the on-peak voltage of the switch tube, thereby reducing the off-voltage of the drive signal, and thus improving the off-speed of the switch tube. When the first switch tube K1 is turned off and the first voltage regulator tube Z1 is set to float, the negative power supply voltage V2 can be increased on the basis of increasing the positive power supply voltage V1 to increase the on-voltage of the drive signal to speed up the on-speed of the switch tube and reduce the loss, thereby increasing the off-voltage of the drive signal and reducing the off-peak voltage of the switch tube.

[0043] Reference Figure 3a and Figure 3b In this embodiment, if the power conversion circuit uses NMOS as the switch tube, the power supply voltage output terminal Vout can only include the positive voltage output terminal VCC, and the driving power supply is only used to provide the power supply positive voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-. The control circuit generates the on-voltage of the driving signal according to the positive power supply voltage V1, and the off-voltage of the driving signal can be directly provided by the reference voltage output terminal BUS-.

[0044] Specifically, refer to Figure 3a, the driving power supply may include a second voltage regulator tube Z2 and a voltage dividing capacitor C1 connected in parallel between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the voltage regulation value of the second voltage regulator tube Z2 needs to be greater than the voltage regulation value of the first voltage regulator tube Z1. For example, the first voltage regulator tube Z1 may adopt a voltage regulator tube with a voltage regulation value of 10V, and the second voltage regulator tube Z2 may adopt a voltage regulator tube with a voltage regulation value of 16V. When the first switch tube K1 is disconnected, the first voltage regulator tube Z1 is set to float, and the second voltage regulator tube Z2 maintains the positive voltage V1 of the power supply to the fixed voltage regulation value of the second voltage regulator tube Z2. Specifically, the positive voltage V1 of the power supply is stabilized at the voltage regulation value of the second voltage regulator tube Z2, that is, V1=16V. When the first switch tube K1 is turned on, the first voltage regulator tube Z1 and the second voltage regulator tube Z2 form a parallel relationship, so that the positive voltage V1 of the power supply is converted into a fixed voltage value of the first voltage regulator tube Z1. Specifically, the positive voltage V1 of the power supply becomes stable at the voltage value of the first voltage regulator tube Z1, that is, V1=10V, thereby realizing the voltage conversion and stabilization of the positive voltage V1 of the power supply, thereby realizing the conversion and stabilization of the conduction voltage of the drive signal. Exemplarily, when the conduction peak voltage is large, by turning on the first switch tube K1 and putting the first voltage regulator tube Z1 into operation, the positive voltage V1 of the power supply can be reduced, thereby reducing the conduction voltage of the drive signal to reduce the conduction peak voltage of the switch tube. When it is necessary to reduce the loss, by turning off the first switch tube K1 and setting the first voltage regulator tube Z1 to float, the positive voltage V1 of the power supply can be increased, thereby increasing the conduction voltage of the drive signal to speed up the conduction speed of the switch tube and reduce the loss.

[0045] Or, refer to Figure 3b, the driving power supply may also include a voltage-dividing resistor R1 and a voltage-dividing capacitor C1 connected in parallel between the positive voltage output terminal VCC and the reference voltage output terminal BUS-. For example, the first voltage-stabilizing tube Z1 may be a voltage-stabilizing tube with a voltage-stabilizing value of 10V. The voltage of the positive voltage output terminal VCC is 16V but actually floats between 15V-17V, and the voltage of the reference voltage output terminal BUS- is set to 0V. When the first switch tube K1 is disconnected, the first voltage-stabilizing tube Z1 is set to float, and the positive voltage V1 of the power supply floats between 15V-17V. When the first switch tube K1 is turned on, the first voltage-stabilizing tube Z1, the voltage-dividing resistor R1 and the voltage-dividing capacitor C1 form a parallel relationship, so that the positive voltage V1 of the power supply is converted into a fixed voltage-stabilizing value of the first voltage-stabilizing tube Z1. Specifically, the positive voltage V1 of the power supply becomes stable at the voltage-stabilizing value of the first voltage-stabilizing tube Z1, that is, V1=10V, thereby realizing the voltage conversion and stabilization of the positive voltage V1 of the power supply, thereby realizing the on-voltage conversion and stabilization of the driving signal. For example, when the on-peak voltage is large, the positive voltage V1 of the power supply can be reduced by turning on the first switch tube K1 and inputting the first voltage regulator tube Z1, thereby reducing the on-voltage of the drive signal and reducing the on-peak voltage of the switch tube. When the loss needs to be reduced, the positive voltage V1 of the power supply can be increased by turning off the first switch tube K1 and floating the first voltage regulator tube Z1, thereby increasing the on-voltage of the drive signal, so as to speed up the on-speed of the switch tube and reduce the loss.

[0046] Embodiment 2:

[0047] Reference Figure 4In this embodiment, the power supply voltage output terminal Vout specifically includes a negative voltage output terminal VEE, and the driving power supply is used to provide a negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the control circuit generates a turn-off voltage of the driving signal according to the negative power supply voltage V2. The voltage stabilizing circuit can specifically perform voltage conversion and stabilization on the negative power supply voltage V2 to achieve the turn-off voltage conversion of the driving signal. Specifically, the first switch tube K1 and the first voltage regulator tube Z1 are connected in series between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, the second voltage regulator tube Z2 and the voltage dividing capacitor C2 are connected in parallel between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the filter device can be connected between the control terminal of the first switch tube K1 and the negative voltage output terminal VEE. The voltage stabilization value of the first voltage regulator tube Z1 is less than the voltage stabilization value of the second voltage regulator tube Z2. For example, the first voltage regulator tube Z1 can use a voltage regulator tube with a voltage stabilization value of 10V, and the second voltage regulator tube Z2 can use a voltage regulator tube with a voltage stabilization value of 16V. When the first switch tube K1 is disconnected, the voltage stabilizing circuit is in the exit state, that is, the first voltage stabilizing tube Z1 is set to float, and the second voltage stabilizing tube Z2 keeps the negative voltage V2 of the power supply at the fixed voltage stabilizing value of the second voltage stabilizing tube Z2. Specifically, the negative voltage V2 of the power supply is stabilized at the voltage stabilizing value of the second voltage stabilizing tube Z2, that is, V2 = -16V. When the first switch tube K1 is turned on, the voltage stabilizing circuit is in the input state, that is, the first voltage stabilizing tube Z1 and the second voltage stabilizing tube Z2 are connected in parallel, so that the negative voltage V2 of the power supply is converted to the fixed voltage stabilizing value of the first voltage stabilizing tube Z1. Specifically, the negative voltage V2 of the power supply is converted to the voltage stabilizing value of the first voltage stabilizing tube Z1, that is, V2 = -10V, thereby realizing the voltage conversion and stabilization of the negative voltage V2 of the power supply, thereby realizing the off voltage conversion and stabilization of the drive signal. For example, when the turn-off peak voltage is large, the absolute value of the negative power supply voltage V2 can be reduced by turning on the first switch tube K1 and inputting the first voltage regulator tube Z1, thereby reducing the absolute value of the turn-off voltage of the drive signal to reduce the turn-off peak voltage of the switch tube. When it is necessary to reduce the loss, the absolute value of the negative power supply voltage V2 can be increased by turning off the first switch tube K1 and setting the first voltage regulator tube Z1 to float, thereby increasing the absolute value of the turn-off voltage of the drive signal to speed up the turn-off speed of the switch tube and reduce the loss.

[0048] Reference Figure 4In this embodiment, if the power conversion circuit uses IGBT as a switch tube, the power supply voltage output terminal Vout also needs to include a positive voltage output terminal VCC, and the driving power supply also needs to provide a positive power supply voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the control circuit generates a turn-on voltage of the driving signal according to the positive power supply voltage V1. The voltage difference between the positive voltage output terminal VCC and the negative voltage output terminal VEE is a fixed value, for example, it can be 25V, and the positive power supply voltage V1 changes with the change of the negative power supply voltage V2. Then the driving power supply can also include a voltage dividing resistor R1 and a voltage dividing capacitor C1 connected in parallel between the positive voltage output terminal VCC and the reference voltage output terminal BUS-. When the first switch tube K1 is disconnected, the negative power supply voltage V2 is stabilized at the voltage stabilization value of the second voltage regulator tube Z2, that is, V2=-16V, and the positive power supply voltage V1=VCC-VEE-16V=9V. When the first switch tube K1 is turned on, the negative power supply voltage V2 becomes stable at the voltage value of the first voltage regulator tube Z1, that is, V2 = -10V, and the positive power supply voltage V1 = VCC-VEE-10V = 15V. The positive power supply voltage V1 increases with the increase of the negative power supply voltage V2. When the first switch tube K1 is turned on and the first voltage regulator tube Z1 is put into operation, the positive power supply voltage V1 is increased on the basis of increasing the negative power supply voltage V2 to increase the on-voltage of the drive signal to reduce the turn-off peak voltage of the switch tube, thereby increasing the on-voltage of the drive signal, and the turn-on speed of the switch tube can be improved. When the first switch tube K1 is turned off and the first voltage regulator tube Z1 is set to float, the positive power supply voltage V1 can be increased on the basis of reducing the negative power supply voltage V2 to reduce the turn-off voltage of the drive signal to speed up the turn-off speed of the switch tube and reduce the loss, thereby increasing the on-voltage of the drive signal and reducing the turn-on peak voltage of the switch tube.

[0049] Reference Figure 5a and Figure 5b In this embodiment, if the power conversion circuit uses PMOS as the switch tube, the power supply voltage output terminal Vout can only include the negative voltage output terminal VEE, and the driving power supply is only used to provide the negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-. The control circuit generates the on-voltage of the driving signal according to the negative power supply voltage V2, and the off-voltage of the driving signal can be directly provided by the reference voltage output terminal BUS-.

[0050] Specifically, refer to Figure 5a, the driving power supply may include a second voltage regulator tube Z2 and a voltage dividing capacitor C2 connected in parallel between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the voltage regulation value of the second voltage regulator tube Z2 needs to be greater than the voltage regulation value of the first voltage regulator tube Z1. For example, the first voltage regulator tube Z1 may adopt a voltage regulator tube with a voltage regulation value of 10V, and the second voltage regulator tube Z2 may adopt a voltage regulator tube with a voltage regulation value of 16V. When the first switch tube K1 is disconnected, the first voltage regulator tube Z1 is set to float, and the second voltage regulator tube Z2 maintains the negative voltage V2 of the power supply at the fixed voltage regulation value of the second voltage regulator tube Z2. Specifically, the negative voltage V2 of the power supply is stabilized at the voltage regulation value of the second voltage regulator tube Z2, that is, V2=-16V. When the first switch tube K1 is turned on, the first voltage regulator tube Z1 and the second voltage regulator tube Z2 form a parallel relationship, so that the negative voltage V2 of the power supply is converted into a fixed voltage value of the first voltage regulator tube Z1. Specifically, the negative voltage V2 of the power supply becomes a stable voltage value of the first voltage regulator tube Z1, that is, V2 = -10V, thereby realizing the voltage conversion and stabilization of the negative voltage V2 of the power supply, thereby realizing the conversion and stabilization of the conduction voltage of the drive signal. Exemplarily, when the conduction peak voltage is large, by turning on the first switch tube K1 and putting the first voltage regulator tube Z1 into operation, the negative voltage V2 of the power supply can be reduced, thereby reducing the conduction voltage of the drive signal to reduce the conduction peak voltage of the switch tube. When it is necessary to reduce the loss, by turning off the first switch tube K1 and setting the first voltage regulator tube Z1 to float, the negative voltage V2 of the power supply can be increased, thereby increasing the conduction voltage of the drive signal to speed up the conduction speed of the switch tube and reduce the loss.

[0051] Or, refer to Figure 5b, the driving power supply may also include a voltage-dividing resistor R2 and a voltage-dividing capacitor C2 connected in parallel between the negative voltage output terminal VEE and the reference voltage output terminal BUS-. For example, the first voltage-stabilizing tube Z1 may be a voltage-stabilizing tube with a voltage-stabilizing value of 10V. The voltage of the negative voltage output terminal VEE is -16V but actually floats between -15V and -17V. The voltage of the reference voltage output terminal BUS- is set to 0V. When the first switch tube K1 is disconnected, the first voltage-stabilizing tube Z1 is set to float, and the negative voltage V2 of the power supply floats between -15V and -17V. When the first switch tube K1 is turned on, the first voltage-stabilizing tube Z1, the voltage-dividing resistor R2 and the voltage-dividing capacitor C2 form a parallel relationship, so that the negative voltage V2 of the power supply is converted into a fixed voltage-stabilizing value of the first voltage-stabilizing tube Z1. Specifically, the negative voltage V2 of the power supply becomes a voltage-stabilizing value of the first voltage-stabilizing tube Z1, that is, V2=-10V, thereby realizing the voltage conversion and stabilization of the negative voltage V2 of the power supply, thereby realizing the on-voltage conversion and stabilization of the driving signal. For example, when the on-peak voltage is large, the negative voltage V2 of the power supply can be reduced by turning on the first switch tube K1 and inputting the first voltage regulator tube Z1, thereby reducing the on-voltage of the drive signal to reduce the on-peak voltage of the switch tube. When it is necessary to reduce the loss, the negative voltage V2 of the power supply can be increased by turning off the first switch tube K1 and floating the first voltage regulator tube Z1, thereby increasing the on-voltage of the drive signal to speed up the on-speed of the switch tube and reduce the loss.

[0052] Embodiment three:

[0053] Reference Figure 6In this embodiment, the power supply voltage output terminal Vout specifically includes a positive voltage output terminal VCC and a negative voltage output terminal VEE. The driving power supply is used to provide a positive power supply voltage V1 between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and to provide a negative power supply voltage V2 between the negative voltage output terminal VEE and the reference voltage output terminal BUS-. The control circuit generates a turn-on voltage of the driving signal according to the positive power supply voltage V1, and the control circuit generates a turn-off voltage of the driving signal according to the negative power supply voltage V2. The voltage stabilizing circuit includes two groups of first switch tubes K1 and first voltage stabilizing tubes Z1, wherein one group of first switch tubes K11 and first voltage stabilizing tubes Z11 are connected in series between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, and the corresponding filter device can be connected between the control terminal of the first switch tube K11 and the reference voltage output terminal BUS-; another group of first switch tubes K12 and first voltage stabilizing tubes Z12 are connected in series between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, and the corresponding filter device can be connected between the control terminal of the first switch tube K12 and the negative voltage output terminal VCC. The voltage stabilization values ​​of the first voltage regulator tubes Z11 and Z12 can be set to any value as needed, and the two can be the same or different. For example, the first voltage regulator tube Z11 can use a voltage regulator tube with a voltage stabilization value of 10V, and the first voltage regulator tube Z12 can also use a voltage regulator tube with a voltage stabilization value of 10V. The voltage difference between the positive voltage output terminal VCC and the negative voltage output terminal VEE is a fixed value, for example, it can be 25V. When the first switch tube K11 is turned on and the first switch tube K12 is turned off, the first voltage regulator tube Z12 is set to float, and the first voltage regulator tube Z11 controls the positive voltage V1 of the power supply to be the fixed voltage stabilization value of the first voltage regulator tube Z11. Specifically, the positive voltage V1 of the power supply is stabilized at the voltage stabilization value of the first voltage regulator tube Z11, that is, V1=10V, thereby realizing the voltage conversion and stabilization of the positive voltage V1 of the power supply, thereby realizing the on-voltage conversion and stabilization of the drive signal. When the first switch tube K11 is turned off and the first switch tube K12 is turned on, the first voltage regulator tube Z11 is set to float, and the first voltage regulator tube Z12 controls the negative power supply voltage V2 to a fixed voltage regulation value of the first voltage regulator tube Z12. Specifically, the negative power supply voltage V2 becomes stable at the voltage regulation value of the first voltage regulator tube Z12, that is, V2=-10V, thereby realizing the voltage conversion and stabilization of the negative power supply voltage V2, thereby realizing the off-voltage conversion and stabilization of the drive signal. When the first switch tubes K11 and K12 are turned on at the same time, the first voltage regulator tube Z11 controls the positive power supply voltage V1 to a fixed value, that is, V1=10V, and the first voltage regulator tube Z12 controls the negative power supply voltage V2 to a fixed value, that is, V2=-10V, thereby realizing the simultaneous voltage conversion and stabilization of the positive power supply voltage V1 and the negative power supply voltage V2, thereby realizing the on-off voltage conversion and stabilization of the drive signal.

[0054] Reference Figure 6In this embodiment, the driving power supply may further include two groups of voltage dividers and voltage divider capacitors, wherein one group of voltage dividers R1 and voltage divider capacitor C1 are connected in parallel between the positive voltage output terminal VCC and the reference voltage output terminal BUS-, so as to realize that when the positive voltage V1 of the power supply is controllable and stable, the negative voltage V2 of the power supply changes along with the change of the positive voltage V1 of the power supply; the other group of voltage dividers R2 and voltage divider capacitor C2 are connected in parallel between the negative voltage output terminal VEE and the reference voltage output terminal BUS-, so as to realize that when the negative voltage V2 of the power supply is controllable and stable, the positive voltage V1 of the power supply changes along with the change of the negative voltage V2 of the power supply. Specifically, when the first switch tube K11 is turned on and the second switch tube K12 is turned off, when the positive voltage V1 of the power supply is stabilized at the voltage value of the first voltage regulator tube Z11, i.e., V1=10V, the negative voltage V2 of the power supply is -(VCC-VEE-10V)=-15V. When the first switch tube K11 is turned off and the second switch tube K12 is turned on, the negative power supply voltage V2 is stabilized at the voltage value of the first voltage regulator tube Z12, that is, V2 = -10V, and the positive power supply voltage V1 = VCC-VEE-10V = 15V. When the first switch tube K11 is turned on and the first switch tube K12 is turned off, the positive power supply voltage V1 can be reduced to reduce the on-voltage of the drive signal to reduce the on-peak voltage of the switch tube, and the negative power supply voltage V2 can be reduced to reduce the off-voltage of the drive signal, which can increase the off-speed of the switch tube. When the first switch tube K11 is turned off and the first switch tube K12 is turned on, the positive power supply voltage V1 can be increased to increase the on-voltage of the drive signal to speed up the on-speed of the switch tube and reduce the loss, and the negative power supply voltage V2 can be increased to increase the off-voltage of the drive signal, which can reduce the off-peak voltage of the switch tube.

[0055] Reference Figure 7a In this embodiment, the voltage-dividing resistor R1 connected between the positive voltage output terminal VCC and the reference voltage output terminal BUS- can also be replaced by a second voltage regulator tube Z21. The voltage regulation value of the second voltage regulator tube Z21 is greater than the voltage regulation value of the first voltage regulator tube Z11. For example, the second voltage regulator tube Z21 can use a voltage regulator tube with a voltage regulation value of 16V. The second voltage regulator tube Z21 can maintain the positive voltage V1 of the power supply at a fixed voltage regulation value of the second voltage regulator tube Z21 when the first switch tube K11 is disconnected. Specifically, the positive voltage V1 of the power supply is stabilized at the voltage regulation value of the second voltage regulator tube Z21, that is, V1=16V.

[0056] Reference Figure 7bIn this embodiment, the voltage-dividing resistor R2 connected between the negative voltage output terminal VEE and the reference voltage output terminal BUS- can also be replaced by a second voltage regulator tube Z22. The voltage regulation value of the second voltage regulator tube Z22 is greater than the voltage regulation value of the first voltage regulator tube Z12. For example, the second voltage regulator tube Z22 can use a voltage regulator tube with a voltage regulation value of 16V. The second voltage regulator tube Z22 can maintain the negative power supply voltage V2 at a fixed voltage regulation value of the second voltage regulator tube Z22 when the first switch tube K12 is disconnected. Specifically, the negative power supply voltage V2 is stabilized at the voltage regulation value of the second voltage regulator tube Z22, that is, V2=-16V.

[0057] Reference Figure 7c In this embodiment, the voltage-dividing resistor R1 connected between the positive voltage output terminal VCC and the reference voltage output terminal BUS- can also be replaced by a second voltage-stabilizing tube Z21, and the voltage-dividing resistor R2 connected between the negative voltage output terminal VEE and the reference voltage output terminal BUS- can be replaced by a second voltage-stabilizing tube Z22. The voltage-stabilizing values ​​of the second voltage-stabilizing tubes Z21 and Z22 are greater than the voltage-stabilizing values ​​of the first voltage-stabilizing tubes Z11 and Z12. For example, the second voltage-stabilizing tubes Z21 and Z22 can use voltage-stabilizing tubes with a voltage-stabilizing value of 16V. The second voltage-stabilizing tube Z21 can realize that when the first switch tube K11 is disconnected, the positive voltage V1 of the power supply is kept at a fixed voltage-stabilizing value of the second voltage-stabilizing tube Z21. Specifically, the positive voltage V1 of the power supply is stabilized at the voltage-stabilizing value of the second voltage-stabilizing tube Z21, that is, V1=16V. The second voltage regulator tube Z22 can maintain the negative power supply voltage V2 at a fixed voltage regulation value of the second voltage regulator tube Z22 when the first switch tube K12 is disconnected. Specifically, the negative power supply voltage V2 is stabilized at the voltage regulation value of the second voltage regulator tube Z22, that is, V2=-16V.

[0058] The above-mentioned power converter provided by the present application is connected in parallel with a voltage stabilizing circuit to the driving power supply in the driving circuit. The voltage stabilizing circuit includes a first switch tube and a first voltage stabilizing tube connected in series between the power supply voltage output terminal and the reference voltage output terminal. By controlling the on-off state of the first switch tube, the state of the first voltage stabilizing tube in and out of the driving power supply can be switched, thereby realizing the voltage stabilizing conversion control of the power supply voltage provided by the driving power supply. Since the control circuit generates the on-off voltage of the driving signal sent to the switch tube in the power conversion circuit according to the power supply voltage, the on-off voltage of the driving signal can be converted by converting the power supply voltage, thereby changing the switching speed of the switch tube in the power conversion circuit. When the on-off voltage of the driving signal is reduced, the peak voltage of the switch tube can be reduced. When the on-off voltage of the driving signal is increased, the switching speed of the switch tube can be increased to reduce the loss.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power converter, characterized in that: include: A power conversion circuit and a drive circuit, wherein the power conversion circuit includes at least one switch tube, and the drive circuit is used to send a drive signal to the switch tube in the power conversion circuit; wherein, The driving circuit includes a driving power supply, a voltage stabilizing circuit and a control circuit; The driving power supply comprises a power supply voltage output terminal and a reference voltage output terminal, the driving power supply is used to provide the control circuit with a power supply voltage between the power supply voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate an on-off voltage of the driving signal according to the power supply voltage; The voltage stabilizing circuit includes a first switch tube and a first voltage stabilizing tube, and the first switch tube and the first voltage stabilizing tube are connected in series between the power supply voltage output terminal and the reference voltage output terminal; when the first switch tube is turned on, the voltage value of the power supply voltage is the stabilizing value of the first voltage stabilizing tube.

2. The power converter according to claim 1, characterized in that The driving power supply also includes a second voltage regulator tube and a voltage-dividing capacitor connected in parallel between the power supply voltage output terminal and the reference voltage output terminal, and the voltage regulation value of the second voltage regulator tube is greater than the voltage regulation value of the first voltage regulator tube; when the first switch tube is turned off, the voltage value of the power supply voltage is the voltage regulation value of the second voltage regulator tube.

3. The power converter according to claim 2, characterized in that: The power supply voltage output terminal includes a positive voltage output terminal, the driving power supply is used to provide the control circuit with a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate a conduction voltage of the driving signal according to the positive power supply voltage; The first switch tube and the first voltage regulator tube are connected in series between the positive voltage output terminal and the reference voltage output terminal, and the second voltage regulator tube and the voltage dividing capacitor are connected in parallel between the positive voltage output terminal and the reference voltage output terminal.

4. The power converter according to claim 3, characterized in that: The power supply voltage output terminal also includes a negative voltage output terminal, the driving power supply is used to provide the control circuit with a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate a shutdown voltage of the driving signal according to the negative power supply voltage; The driving power supply further includes a voltage dividing resistor and a voltage dividing capacitor connected in parallel between the negative voltage output terminal and the reference voltage output terminal.

5. The power converter according to claim 2, characterized in that: The power supply voltage output terminal includes a negative voltage output terminal, the driving power supply is used to provide the control circuit with a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate a shutdown voltage of the driving signal according to the negative power supply voltage; The first switch tube and the first voltage regulator tube are connected in series between the negative voltage output terminal and the reference voltage output terminal, and the second voltage regulator tube and the voltage dividing capacitor are connected in parallel between the negative voltage output terminal and the reference voltage output terminal.

6. The power converter according to claim 5, characterized in that The power supply voltage output terminal further includes a positive voltage output terminal, the driving power supply is used to provide the control circuit with a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate a conduction voltage of the driving signal according to the positive power supply voltage; The driving power supply further includes a voltage dividing resistor and a voltage dividing capacitor connected in parallel between the positive voltage output terminal and the reference voltage output terminal.

7. The power converter according to claim 1, characterized in that: The power supply voltage output terminal includes a positive voltage output terminal and a negative voltage output terminal, the driving power supply is used to provide the control circuit with a positive power supply voltage between the positive voltage output terminal and the reference voltage output terminal, and to provide a negative power supply voltage between the negative voltage output terminal and the reference voltage output terminal, and the control circuit is used to generate a turn-on voltage of the driving signal according to the positive power supply voltage, and to generate a turn-off voltage of the driving signal according to the negative power supply voltage; The voltage stabilizing circuit includes two groups of the first switching tubes and the first voltage stabilizing tubes, wherein one group of the first switching tubes and the first voltage stabilizing tubes are connected in series between the positive voltage output terminal and the reference voltage output terminal, and the other group of the first switching tubes and the first voltage stabilizing tubes are connected in series between the negative voltage output terminal and the reference voltage output terminal.

8. The power converter according to claim 7, characterized in that: The driving power supply also includes two groups of voltage-dividing resistors and voltage-dividing capacitors, wherein one group of the voltage-dividing resistors and the voltage-dividing capacitors are connected in parallel between the positive voltage output terminal and the reference voltage output terminal, and the other group of the voltage-dividing resistors and the voltage-dividing capacitors are connected in parallel between the negative voltage output terminal and the reference voltage output terminal.

9. The power converter according to any one of claims 1 to 8, characterized in that: The voltage stabilizing circuit further includes a current limiting resistor, which is connected in series between the first switch tube and the first voltage stabilizing tube.

10. The power converter according to any one of claims 1 to 9, characterized in that: The voltage stabilizing circuit further includes a filter device, the filter device is connected to the control end of the first switch tube, and the filter device includes at least one of a filter capacitor, a filter resistor and a filter diode.

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