Power converter and power supply equipment

Abstract

The invention discloses a power converter and power supply equipment, and belongs to the technical field of power electronics. The power converter comprises a driving circuit, a driving impedance network, a power conversion circuit and at least one variable current circuit, wherein the variable current circuit is connected between the power conversion circuit and the driving circuit; wherein the current direction of the at least one variable current circuit comprises at least one of the direction of flowing into the power conversion circuit and the direction of flowing out of the power conversion circuit, the variable current circuit is provided with a first switching device, and the first switching device is used for controlling the on-off of the variable current circuit. Therefore, the driving switching rate of the power conversion circuit is adjusted. According to the power converter, through the variable current circuit, the magnitude of current flowing in or out of the power conversion circuit is changed, on or off of the power transistor is accelerated, accurate control over the driving rate is achieved, the response rate is high, and stability is high.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and in particular relates to 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.

[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 too fast, 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] Currently, the response speed of the power converter to adjust the driving speed is slow, and the accuracy of the driving speed control is low. 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 power converter and a power supply device, which can improve the adjustment response speed and control accuracy of the driving rate.

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

[0007] Drive circuit and drive impedance network;

[0008] A power conversion circuit, wherein the driving impedance network is connected between the driving circuit and the power conversion circuit;

[0009] at least one variable current circuit, the variable current circuit being connected between the power conversion circuit and the drive circuit;

[0010] Among them, the current direction of the at least one variable current circuit includes at least one of a direction flowing into the power conversion circuit and a direction flowing out of the power conversion circuit, and the variable current circuit is provided with a first switching device, and the first switching device is used to control the on and off of the variable current circuit to adjust the driving switching rate of the power conversion circuit.

[0011] According to the power converter of the present application, a variable current circuit is set between the driving circuit and the power conversion circuit to change the current flowing into or out of the power conversion circuit, thereby accelerating the opening or closing of the power transistor in the power conversion circuit, thereby achieving precise control of the driving rate, fast response rate and high stability, and can provide the power converter with multiple driving rate modes and a wide regulation dimension.

[0012] According to one embodiment of the present application, the variable current circuit whose current direction is flowing into the power conversion circuit is used to adjust the driving turn-on rate of the power conversion circuit;

[0013] The variable current circuit, whose current direction is to flow out of the power conversion circuit, is used to adjust the driving shutdown rate of the power conversion circuit.

[0014] According to an embodiment of the present application, the driving circuit includes a push-pull circuit.

[0015] According to one embodiment of the present application, one end of the variable current circuit in which the current flows out of the power conversion circuit is connected to the power conversion circuit, and the other end of the variable current circuit in which the current flows out of the power conversion circuit is connected to the low level end, the output end or the midpoint of the voltage stabilizing unit of the push-pull circuit.

[0016] According to one embodiment of the present application, one end of the variable current circuit in which the current flows into the power conversion circuit is connected to the power conversion circuit, and the other end of the variable current circuit in which the current flows into the power conversion circuit is connected to the high level end or output end of the push-pull circuit.

[0017] According to one embodiment of the present application, the power converter includes at least one variable current circuit whose current direction is flowing into the power conversion circuit and at least one variable current circuit whose current direction is flowing out of the power conversion circuit;

[0018] The first switch device corresponding to the variable current circuit whose current direction is flowing into the power conversion circuit is interlocked with the first switch device corresponding to the variable current circuit whose current direction is flowing out of the power conversion circuit.

[0019] According to an embodiment of the present application, current directions of the plurality of variable current circuits are the same or different.

[0020] According to one embodiment of the present application, the variable current circuit includes a variable current unit and the first switch device connected in series, and the variable current unit is used to adjust the charging current or the discharging current of the power conversion circuit.

[0021] According to an embodiment of the present application, the variable current unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device.

[0022] According to an embodiment of the present application, the variable current unit includes a target transistor, and the first switch device and the target transistor are connected in series.

[0023] According to one embodiment of the present application, the variable current circuit also includes an impedance unit connected to the variable current unit, the variable current unit and the impedance unit form a mirror current circuit, and the first switching device is used to control the variable current unit to provide a mirror current of the impedance unit.

[0024] In a second aspect, the present application provides a power supply device, including:

[0025] A power converter as described in the first aspect above.

[0026] According to the power supply equipment of the present application, a variable current circuit is set between the driving circuit and the power conversion circuit to change the current flowing into or out of the power conversion circuit, thereby accelerating the opening or closing of the power transistor in the power conversion circuit, thereby achieving precise control of the driving rate, fast response rate and high stability, and can provide the power converter with a variety of driving rate modes with a wide regulation dimension.

[0027] 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

[0028] 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:

[0029] Figure 1 It is one of the structural schematic diagrams of the power converter provided in the embodiment of the present application;

[0030] Figure 2 This is the second structural schematic diagram of the power converter provided in the embodiment of the present application;

[0031] Figure 3 This is the third structural schematic diagram of the power converter provided in the embodiment of the present application;

[0032] Figure 4 This is the fourth structural schematic diagram of the power converter provided in the embodiment of the present application;

[0033] Figure 5 This is the fifth structural diagram of the power converter provided in the embodiment of the present application;

[0034] Figure 6 This is the sixth structural diagram of the power converter provided in the embodiment of the present application;

[0035] Figure 7 This is the seventh structural diagram of the power converter provided in the embodiment of the present application;

[0036] Figure 8 This is the eighth structural schematic diagram of the power converter provided in the embodiment of the present application;

[0037] Fig. 9 This is the ninth structural diagram of the power converter provided in the embodiment of the present application;

[0038] Fig.10 This is the tenth structural diagram of the power converter provided in the embodiment of the present application;

[0039] Fig.11 This is the eleventh structural diagram of the power converter provided in the embodiment of the present application;

[0040] Fig.12 This is the twelfth structural diagram of the power converter provided in the embodiment of the present application;

[0041] Fig.13 This is the thirteenth structural diagram of the power converter provided in the embodiment of the present application;

[0042] Fig.14 This is the fourteenth structural diagram of the power converter provided in the embodiment of the present application;

[0043] Fig.15 This is the fifteenth structural schematic diagram of the power converter provided in the embodiment of the present application.

[0044] Reference numerals:

[0045] The control circuit 110 , the driving signal transmission unit 120 , the first voltage stabilizing unit 131 , the second voltage stabilizing unit 132 , the driving impedance network 140 , the variable current circuit 200 , the impedance unit 220 , and the power conversion circuit 300 . DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] An embodiment of the present application provides a power converter, which realizes precise control of the driving rate by adjusting the current size of the variable current circuit 200, or controlling whether the variable current circuit 200 is working. It has a fast response rate and high stability, and can provide the power converter with multiple driving rate modes and a wide regulation dimension.

[0049] The power converter and power supply device provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0050] like Figure 1 As shown, the power converter according to the embodiment of the present application includes a driving circuit, a driving impedance network 140 , a power conversion circuit 300 and at least one variable current circuit 200 .

[0051] In the power converter, the drive circuit is a component connecting the control circuit 110 and the power conversion circuit 300 , and can amplify the control signal from the control circuit 110 and drive the power conversion circuit 300 to achieve power conversion.

[0052] In actual implementation, the power conversion circuit 300 may include a power transistor. The control signal is transmitted through the driving circuit, and the power transistor can be switched under the action of the control circuit 110 to achieve power conversion.

[0053] It can be understood that the driving rate of the power converter refers to the rate at which the control signal causes the power transistor to switch between the on state and the off state.

[0054] In this embodiment, the driving impedance network 140 is connected between the driving circuit and the power conversion circuit 300. The driving impedance network 140 can adjust and optimize the signals of the control circuit 110 and the driving circuit so that the power conversion circuit 300 can receive a driving signal of appropriate strength.

[0055] In actual implementation, the driving impedance network 140 may include a combination of one or more of a resistive device, a capacitive device, an inductive device, a unidirectional conductive device, and a bidirectional conductive device, so that the on and off driving impedances are adjustable.

[0056] In this embodiment, the power converter is provided with one or more variable current circuits 200 , and the variable current circuits 200 are connected between the power conversion circuit 300 and the drive circuit.

[0057] The current direction of at least one variable current circuit 200 includes at least one of a direction of flowing into the power conversion circuit 300 and a direction of flowing out of the power conversion circuit 300 .

[0058] It should be noted that the current direction of the variable current circuit 200 can be the direction of flowing into the power conversion circuit 300. This type of variable current circuit 200 can increase the current flowing into the power conversion circuit 300; the current direction of the variable current circuit 200 can be the direction of flowing out of the power conversion circuit 300. This type of variable current circuit 200 can increase the current flowing out of the power conversion circuit 300.

[0059] In actual implementation, the power converter may be provided with a plurality of variable current circuits 200 , and the current directions of the plurality of variable current circuits 200 may be the same or different.

[0060] For example, the power converter is provided with a plurality of variable current circuits 200 , and the current directions of the plurality of variable current circuits 200 are all directions flowing into the power conversion circuit 300 , or the current directions of the plurality of variable current circuits 200 are all directions flowing out of the power conversion circuit 300 .

[0061] For another example, the power converter is provided with a plurality of variable current circuits 200 , the current direction of some variable current circuits 200 is the direction of flowing into the power conversion circuit 300 , and the current direction of other variable current circuits 200 is the direction of flowing out of the power conversion circuit 300 .

[0062] In this embodiment, the variable current circuit 200 is provided with a first switch device, and the first switch device is used to control the on-off of the variable current circuit 200 to adjust the driving switching rate of the power conversion circuit 300 .

[0063] The first switch device 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.

[0064] It should be noted that the driving switching rate of the power conversion circuit 300 may include a driving turn-on rate and a driving turn-off rate. Adjusting the driving turn-on rate is to adjust the rate at which the power transistors in the power conversion circuit 300 are turned on; adjusting the driving turn-off rate is to adjust the rate at which the power transistors in the power conversion circuit 300 are turned off.

[0065] It can be understood that the variable current circuit 200 can change the current flowing into or out of the power conversion circuit 300, and control the on and off of the variable current circuit 200 through the first switching device, so that the variable current circuit 200 is connected between the power conversion circuit 300 and the drive circuit, or cut out from the power conversion circuit 300 and the drive circuit, changing the current flowing into or out of the power conversion circuit 300, adjusting the rate at which the power transistor in the power conversion circuit 300 is turned on or off, achieving precise control of the driving rate, and realizing a variety of rate adjustment methods of the power conversion circuit 300, with fast response rate and high stability.

[0066] In some embodiments, the variable current circuit 200 , whose current direction is to flow into the power conversion circuit 300 , is used to adjust the driving turn-on rate of the power conversion circuit 300 .

[0067] In this embodiment, the current direction of the variable current circuit 200 is the direction of flowing into the power conversion circuit 300. When the variable current circuit 200 is connected to the power conversion circuit 300 through the first switching device, the current flowing into the power conversion circuit 300 increases and the driving opening rate is accelerated.

[0068] For example, Figure 2 As shown, the current direction of the variable current circuit 200 (indicated by the bold black arrow in the figure) is the direction of flowing into the power conversion circuit 300, and the variable current circuit 200 is connected in series with the first switch device K1.

[0069] When K1 is closed, the variable current circuit 200 is activated, which significantly increases the charging current of the gate of the power transistor in the power conversion circuit 300, speeds up the drive turn-on rate, and the power converter is in a high turn-on rate mode.

[0070] When K1 is disconnected, the variable current circuit 200 is cut off, the charging current of the gate of the power transistor is reduced, and the power converter is switched to a low turn-on rate mode.

[0071] In some embodiments, the variable current circuit 200 , whose current direction is to flow out of the power conversion circuit 300 , is used to adjust the driving shutdown rate of the power conversion circuit 300 .

[0072] In this embodiment, the current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300. When the variable current circuit 200 is controlled to connect to the power conversion circuit 300 by the first switching device, the current flowing out of the power conversion circuit 300 increases and the driving shutdown rate is accelerated.

[0073] For example, Figure 1 As shown, the current direction of the variable current circuit 200 (indicated by the bold black arrow in the figure) is the direction of flowing out of the power conversion circuit 300, and the variable current circuit 200 is connected in series with the first switch device K1.

[0074] When K1 is closed, the variable current circuit 200 is activated, which significantly increases the discharge current of the gate of the power transistor in the power conversion circuit 300, speeds up the drive shutdown rate, and the power converter is in a high shutdown rate mode.

[0075] When K1 is disconnected, the variable current circuit 200 is cut off, the discharge current of the gate of the power transistor is reduced, and the power converter is switched to a low turn-off rate mode.

[0076] It should be noted that one end of the variable current circuit 200 is connected to the power conversion circuit 300. The variable current circuit 200 can directly change the current flowing into or out of the power conversion circuit 300, directly accelerate the switching of the power transistor in the power conversion circuit 300, and the original circuit between the drive circuit and the power conversion circuit 300 does not affect the variable current circuit 200. The current of the variable current circuit 200 is easy to control, and the way of directly changing the current flowing into or out of the power conversion circuit 300 has a significant acceleration effect and is precisely controllable.

[0077] According to the power converter provided in the embodiment of the present application, by setting a variable current circuit 200 between the driving circuit and the power conversion circuit 300, the current flowing into or out of the power conversion circuit 300 is changed, the opening or closing of the power transistor in the power conversion circuit 300 is accelerated, and precise control of the driving rate is achieved. The response rate is fast and the stability is high. A variety of driving rate modes can be provided for the power converter, and the regulation dimension is wide.

[0078] In some embodiments, the drive circuit includes a push-pull circuit.

[0079] Among them, the push-pull circuit can convert the input signal of the control circuit 110 into high and low levels that can directly drive the power transistor in the power conversion circuit 300, and the high and low levels generated by the push-pull circuit can be transmitted to the power conversion circuit 300 through the driving impedance network 140.

[0080] In actual implementation, the power converter may further include components such as a control circuit 110 and a drive signal transmission unit 120 , which work in conjunction with a drive circuit, a drive impedance network 140 , etc. to achieve effective driving of power transistors in the power conversion circuit 300 .

[0081] It can be understood that the control circuit 110 calculates and generates a driving signal according to the operating requirements of the power converter, and transmits it to the driving signal transmission unit 120. The driving signal transmission unit 120 further processes the signal to adapt to different application scenarios.

[0082] The processed driving signal is then transmitted to the push-pull circuit, which 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 driving impedance network 140. The driving impedance network 140 plays a role in regulating and optimizing signal transmission, so that the gate of the power transistor can receive a driving signal of appropriate strength, thereby achieving effective control of the power transistor.

[0083] In actual implementation, the push-pull circuit may include components such as a switch tube, a voltage stabilizing unit, and a capacitor.

[0084] For example, Figure 1 As shown, the push-pull circuit may include components such as a first switch tube Q1, a second switch tube Q2, a first voltage stabilizing unit 131, a second voltage stabilizing unit 132, a first capacitor C1, a second capacitor C2, and the like.

[0085] The first voltage stabilizing unit 131 is connected in parallel with the first capacitor C1 , and the second voltage stabilizing unit 132 is connected in parallel with the second capacitor C2 .

[0086] In this embodiment, R1 is a resistor connected between the drive signal transmission unit 120 and the push-pull circuit, one end of R1 is connected to the bases of Q1 and Q2, the emitters of Q1 and Q2 are connected to form an output end, the collector of Q1 can form a high level end of the push-pull circuit, and the collector of Q2 can form a low level end of the push-pull circuit.

[0087] The following describes the embodiments of the present application in detail from two different implementation perspectives.

[0088] 1. The current direction of the variable current circuit 200 is the direction of flowing into the power conversion circuit 300 .

[0089] In some embodiments, one end of the variable current circuit 200 in which the current flows into the power conversion circuit 300 is connected to the power conversion circuit 300, and the other end of the variable current circuit 200 in which the current flows into the power conversion circuit 300 is connected to the high level end or output end of the push-pull circuit.

[0090] like Figure 2As shown, one end of the variable current circuit 200 is connected to the power conversion circuit 300, and the other end of the variable current circuit 200 is connected to the high level end of the push-pull circuit. The current direction of the variable current circuit 200 is the direction of flowing into the power conversion circuit 300.

[0091] In this embodiment, the variable current circuit 200 is connected in series with the first switching device K1. When K1 is closed, the variable current circuit 200 is activated, and part of the current in the push-pull circuit is input from the high level end through the variable current circuit 200 to the power conversion circuit 300, which significantly increases the charging current of the gate of the power transistor in the power conversion circuit 300 and speeds up the drive turn-on rate.

[0092] It can be understood that when K1 is disconnected, the variable current circuit 200 is cut off, the charging current of the gate of the power transistor is reduced, the driving turn-on rate is slowed down, and the power converter is switched to a low turn-on rate mode.

[0093] like Figure 3 As shown, one end of the variable current circuit 200 is connected to the power conversion circuit 300 , and the other end of the variable current circuit 200 is connected to the output end of the push-pull circuit. The current direction of the variable current circuit 200 is the direction of flowing into the power conversion circuit 300 .

[0094] It can be understood that one end of the variable current circuit 200 is connected to the power conversion circuit 300 , and the other end of the variable current circuit 200 is connected to the output end of the push-pull circuit, which is equivalent to the variable current circuit 200 being connected in parallel with the driving impedance network 140 .

[0095] In this embodiment, the variable current circuit 200 is connected in parallel with the driving impedance network 140. When K1 is closed, the variable current circuit 200 is activated, part of the current at the output end of the push-pull circuit flows through the variable current circuit 200, and the rest flows through the driving impedance network 140. The charging current of the gate of the power transistor increases, and the driving turn-on rate is accelerated.

[0096] It can be understood that when K1 is disconnected, the variable current circuit 200 is cut off, the current at the output end of the push-pull circuit flows through the driving impedance network 140, the charging current of the power transistor gate is reduced, the driving turn-on rate is slowed down, and the power converter switches to a low turn-on rate mode.

[0097] 2. The current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300.

[0098] In some embodiments, one end of the variable current circuit 200 in which the current flows out of the power conversion circuit 300 is connected to the power conversion circuit 300, and the other end of the variable current circuit 200 in which the current flows out of the power conversion circuit 300 is connected to the low level end, the output end or the midpoint of the voltage stabilizing unit of the push-pull circuit.

[0099] like Figure 4 As shown, one end of the variable current circuit 200 is connected to the power conversion circuit 300, and the other end of the variable current circuit 200 is connected to the midpoint of the voltage stabilizing unit of the push-pull circuit. The current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300.

[0100] The midpoint of the voltage stabilizing unit may be a connection point between the first voltage stabilizing unit 131 and the second voltage stabilizing unit 132 .

[0101] In this embodiment, the variable current circuit 200 is connected in series with the first switching device K1. When K1 is closed, the variable current circuit 200 is activated. The variable current circuit 200 can quickly discharge the gate voltage of the power transistor in the power conversion circuit 300 to 0V corresponding to the midpoint of the voltage stabilizing unit, and then slowly discharge it to a negative voltage through the driving impedance network 140. The discharge current of the gate of the power transistor in the power conversion circuit 300 increases, and the driving shutdown rate is accelerated.

[0102] like Figure 5 As shown, one end of the variable current circuit 200 is connected to the power conversion circuit 300, and the other end of the variable current circuit 200 is connected to the low level end of the push-pull circuit. The current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300.

[0103] In this embodiment, the variable current circuit 200 is connected in series with the first switching device K1. When K1 is closed, the variable current circuit 200 is activated. The variable current circuit 200 can quickly discharge the gate voltage of the power transistor in the power conversion circuit 300 to the negative voltage at the low level end, significantly increase the discharge current of the gate of the power transistor in the power conversion circuit 300, and accelerate the drive shutdown rate.

[0104] It should be noted that the other end of the variable current circuit 200 is connected to the low level end of the push-pull circuit, which can quickly discharge the gate voltage of the power transistor to a negative voltage. Compared with connecting the other end of the variable current circuit 200 to the midpoint of the voltage stabilizing unit of the push-pull circuit and discharging the gate voltage of the power transistor to 0V, connecting the variable current circuit 200 to the low level end can achieve faster shutdown.

[0105] like Figure 6 As shown, one end of the variable current circuit 200 is connected to the power conversion circuit 300 , and the other end of the variable current circuit 200 is connected to the output end of the push-pull circuit. The current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300 .

[0106] It can be understood that one end of the variable current circuit 200 is connected to the power conversion circuit 300 , and the other end of the variable current circuit 200 is connected to the output end of the push-pull circuit, which is equivalent to the variable current circuit 200 being connected in parallel with the driving impedance network 140 .

[0107] In this embodiment, the variable current circuit 200 is connected in series with the first switching device K1. When K1 is closed, the variable current circuit 200 is activated, and part of the discharge current of the power transistor gate flows through the variable current circuit 200, and the rest flows through the driving impedance network 140. The discharge current of the power transistor gate increases, the driving shutdown rate is accelerated, and the power converter is in a high shutdown rate mode.

[0108] It can be understood that when K1 is disconnected, the variable current circuit 200 is cut off, the discharge current of the gate of the power transistor is reduced, the drive shutdown rate is slowed down, and the power converter is switched to a low shutdown rate mode.

[0109] In some embodiments, the power converter includes at least one variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 and at least one variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 .

[0110] In this embodiment, the power converter includes at least two variable current circuits 200, wherein the current direction of a part of the at least two variable current circuits 200 is the direction of flowing into the power conversion circuit 300, and the current direction of another part of the variable current circuits 200 is the direction of flowing out of the power conversion circuit 300.

[0111] For example, Figure 7 As shown, the power converter includes a variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 , and the power converter also includes a variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 .

[0112] In this embodiment, when the variable current circuit 200 is activated so that the current flows into the power conversion circuit 300, the charging current of the gate of the power transistor in the power conversion circuit 300 increases, and the driving turn-on rate is accelerated; when the variable current circuit 200 is activated so that the current flows out of the power conversion circuit 300, the discharge current of the gate of the power transistor in the power conversion circuit 300 increases, and the driving turn-off rate is accelerated.

[0113] In actual implementation, the variable current circuit 200 is provided with a first switching device, which is connected between the drive circuit and the power conversion circuit 300. When the first switching device is closed, the variable current circuit 200 is activated and connected between the drive circuit and the power conversion circuit 300; when the first switching device is disconnected, the variable current circuit 200 is cut out from between the drive circuit and the power conversion circuit 300.

[0114] The first switch device corresponding to the variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 is interlocked with the first switch device corresponding to the variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 .

[0115] It should be noted that the variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 and the variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 cannot be activated at the same time, and the first switching devices corresponding to the variable current circuits 200 with opposite current directions cannot be turned on at the same time, that is, the first switching devices corresponding to the variable current circuits 200 with opposite current directions are interlocked.

[0116] It can be understood that when the variable current circuit 200 is activated so that the current flows into the power conversion circuit 300, the charging current of the gate of the power transistor increases, and the driving turn-on rate is accelerated. When the variable current circuit 200 is activated so that the current flows out of the power conversion circuit 300, the discharge current of the gate of the power transistor increases, and the driving turn-off rate is accelerated.

[0117] For example, Figure 7 As shown, the power converter is provided with a variable current circuit 200 whose current direction is to flow into the power conversion circuit 300, and the variable current circuit 200 is connected in series with the first switch device K1.

[0118] For the variable current circuit 200 whose current direction is to flow into the power conversion circuit 300 , one end is connected to the power conversion circuit 300 , and the other end is connected to the high level end or output end of the push-pull circuit.

[0119] In this embodiment, the power converter is further provided with a variable current circuit 200 whose current direction is to flow out of the power conversion circuit 300 , and the variable current circuit 200 is connected in series with the first switch device K2 .

[0120] For the variable current circuit 200 whose current direction is to flow out of the power conversion circuit 300, one end is connected to the power converter and the other end is connected to the low level end, the output end or the midpoint of the voltage stabilizing unit of the push-pull circuit.

[0121] In actual implementation, K1 and K2 cannot be activated at the same time.

[0122] When K1 is closed and K2 is open, the variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 is activated, and the variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 is cut off, and the driving opening rate is accelerated.

[0123] When K1 is disconnected and K2 is closed, the variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 is activated, and the variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 is cut off, and the driving shutdown rate is accelerated.

[0124] In this embodiment, when one of K1 and K2 is closed and the other is open, the power converter is in a high switching rate mode, and the driving turn-on rate and the driving turn-off rate of the power converter are high.

[0125] In actual implementation, K1 and K2 can both be disconnected, the variable current circuit 200 whose current direction is flowing out of the power conversion circuit 300 and the variable current circuit 200 whose current direction is flowing into the power conversion circuit 300 are both cut off, the power converter is in a low switching rate mode, and the drive turn-on rate and drive turn-off rate of the power converter are low.

[0126] In some embodiments, the current directions of the plurality of variable current circuits 200 are the same or different.

[0127] In this embodiment, the power converter includes a plurality of variable current circuits 200 , and the current directions of the plurality of variable current circuits 200 may be the same or different.

[0128] For example, Figure 7 As shown, the power converter includes two variable current circuits 200, the current direction of one variable current circuit 200 is the direction of flowing out of the power conversion circuit 300, and the current direction of the other variable current circuit 200 is the direction of flowing into the power conversion circuit 300, and the current directions of the two variable current circuits 200 are different.

[0129] For example, Figure 8 As shown, the power converter includes multiple variable current circuits 200, and the current directions of the multiple variable current circuits 200 are all flowing out of the power conversion circuit 300. When the multiple variable current circuits 200 whose current directions are all flowing out of the power conversion circuit 300 are activated, the driving shutdown rate is significantly accelerated.

[0130] In some embodiments, the variable current circuit 200 includes a variable current unit and a first switch device connected in series, and the variable current unit is used to adjust the charging current or the discharging current of the power conversion circuit 300 .

[0131] In this embodiment, a variable current unit and a first switching device connected in series form a variable current circuit 200, and the first switching period controls whether the variable current circuit 200 is connected between the drive circuit and the power conversion circuit 300. When the variable current circuit 200 is connected between the drive circuit and the power conversion circuit 300, the variable current unit in the variable current circuit 200 is activated, and the charging current or discharging current of the power conversion circuit 300 can be adjusted.

[0132] It should be noted that the variable current unit is a device or a combination of devices used to adjust the charging current or discharging current of the power conversion circuit 300 , and the current size that can be changed by the variable current unit can also be adjusted.

[0133] In some embodiments, the variable current unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device.

[0134] In this embodiment, the variable current unit includes a combination of one or more devices selected from resistive devices, capacitive devices, unidirectional conductive devices and bidirectional conductive devices. The variable current unit can increase the discharge current or charging current of the power transistor, and the value of the discharge current or charging current that can be increased by the variable current unit can also be adjusted.

[0135] The following describes the embodiments of the present application in detail from two different implementation perspectives.

[0136] 1. The variable current unit includes a device with current amplification capability.

[0137] The variable current unit may include a device with current amplification capability, including but not limited to a conducting device such as a triode, a metal oxide semiconductor field effect transistor, etc.

[0138] In some embodiments, the variable current unit includes a target transistor, a first switch device and the target transistor connected in series.

[0139] In this embodiment, the base or collector current of the target transistor can be adjusted to control the charging current when the power transistor is turned on, or the discharge current when the power transistor is turned off, so that the turn-on or turn-off rate can be precisely adjusted.

[0140] It is understandable that the variable current unit may include not only the target transistor but also diodes, resistors and other devices, which may be selected according to actual needs.

[0141] For example, Fig. 9 As shown, the variable current unit includes a target transistor Q3, and the variable current unit is optionally equipped with a diode D1, resistors R2 and R3, and the variable current unit is connected in series with the first switch device K1.

[0142] In this embodiment, the current direction of the variable current unit is the direction of flowing out of the power conversion circuit 300. Closing K1 can increase the discharge current of the power transistor in the power conversion circuit 300 to achieve accelerated shutdown.

[0143] It is understandable that the position of the switch K1 is adjustable. Fig.10 As shown, K1 is connected to the base of Q3, such as Fig.11 As shown, K1 is connected to the collector of Q3.

[0144] For example, Fig.12 As shown, the variable current unit includes a target transistor Q3, and the variable current unit is optionally equipped with a diode D2, resistors R2 and R3, and the variable current unit is connected in series with the first switch device K1.

[0145] In this embodiment, the current direction of the variable current unit is the direction of flowing into the power conversion circuit 300. Closing K1 can increase the charging current of the power transistor in the power conversion circuit 300 to achieve accelerated opening.

[0146] It should be noted that the charging current of the power transistor can be controlled by adjusting the base current of Q3, so that the turn-on rate can be precisely adjusted.

[0147] 2. The variable current unit includes a mirror current circuit.

[0148] Among them, the mirror current circuit has strong temperature stability, and the current source amplification factor is almost not affected by temperature.

[0149] In some embodiments, the variable current circuit 200 further includes an impedance unit 220 connected to the variable current unit. The variable current unit and the impedance unit 220 form a mirror current circuit. The first switch device is used to control the variable current unit to provide a mirror current of the impedance unit 220.

[0150] In actual implementation, the impedance unit 220 may include a combination of one or more devices selected from the group consisting of a resistive device, a capacitive device, an inductive device, a unidirectional conductive device, and a bidirectional conductive device. The impedance unit 220 may limit the current to a certain extent.

[0151] In this embodiment, the variable current circuit 200 is provided with an impedance unit 220. The variable current unit and the impedance unit 220 form a mirror current circuit. The variable current unit may include a plurality of devices that form a mirror current source corresponding to the impedance unit 220. The number of mirror current sources involved in driving in the variable current circuit 200 is adjusted by controlling the first switching device to achieve adjustment of the driving turn-on rate or the driving turn-off rate.

[0152] For example, Fig.13As shown, the current direction of the variable current circuit 200 is the direction of flowing into the power conversion circuit 300, the variable current unit and the impedance unit 220 form a mirror current circuit, the variable current unit forms N+1 mirror current sources of the impedance unit 220, and the variable current unit includes N+1 transistors, namely Qi0, Qi1...QiN, and the number of mirror current sources participating in the drive is adjusted by the first switching devices such as K01, K02, K03, K11, K12, K13...KN1, KN1, KN3, so as to realize the adjustment of the drive opening rate.

[0153] For example, Fig.14 As shown, the current direction of the variable current circuit 200 is the direction of flowing out of the power conversion circuit 300, the variable current unit and the impedance unit 220 form a mirror current circuit, the variable current unit forms N+1 mirror current sources of the impedance unit 220, and the variable current unit includes N+1 transistors, namely Qi0, Qi1...QiN, and the number of mirror current sources participating in the drive is adjusted by the first switching devices such as K01, K02, K03, K11, K12, K13...KN1, KN1, KN3, so as to realize the adjustment of the drive shutdown rate.

[0154] It should be noted that the variable current unit and the impedance unit 220 form a mirror current circuit, and the first switch device serves as an enable switch for enabling the mirror current source formed by the variable current unit. The position of the first switch device can be configured as needed.

[0155] like Fig.13 and Fig.14 As shown, the first switch device at the position of K01, K02 or K03 is used to enable the overall mirror current source. When K01, K02 and K03 are closed, the mirror current source works, and the driving current of the variable current unit is N+1 times that of the impedance unit 220.

[0156] It should be noted that when the first enabling switch device is configured at the K01 position, it is easy to configure in the driving circuit. The enabling function can be realized by configuring a switch with a smaller current.

[0157] like Fig.13 and Fig.14 As shown, the first switch device at the position of KN1, KN2 or KN3 is used to independently enable the Nth mirror current source. When KN1, KN2 and KN3 are closed, the Nth mirror current source works, so that the driving current increases by one time the current of the impedance unit 220.

[0158] In actual implementation, the variable current circuit 200 may be provided with a plurality of impedance units 220 , and the plurality of impedance units 220 may be connected in series or in parallel.

[0159] like Fig.15As shown, the variable current circuit 200 includes two impedance units 220. The variable current unit and the impedance unit 220 with a serial number of 1 form a mirror current circuit, forming an N+1 times mirror current driving circuit. The impedance unit 220 with a serial number of 2 is connected in series with the impedance unit 220 with a serial number of 1, which can achieve a decimal multiple change of the driving current before and after the mirror current source is enabled.

[0160] An embodiment of the present application also provides a power supply device, which includes the power converter as described above.

[0161] The power supply equipment may be an inverter, a converter or other equipment to realize power conversion between DC voltage and AC voltage.

[0162] According to the power supply device provided in the embodiment of the present application, by setting a variable current circuit 200 between the driving circuit and the power conversion circuit 300, the current flowing into or out of the power conversion circuit 300 is changed, the opening or closing of the power transistor in the power conversion circuit 300 is accelerated, and precise control of the driving rate is achieved. The response rate is fast and the stability is high. A variety of driving rate modes can be provided for the power converter, and the regulation dimension is wide.

[0163] 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.

[0164] 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.

[0165] 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 power converter, characterized in that: include: Drive circuit and drive impedance network; A power conversion circuit, wherein the driving impedance network is connected between the driving circuit and the power conversion circuit; at least one variable current circuit, the variable current circuit being connected between the power conversion circuit and the drive circuit; Among them, the current direction of the at least one variable current circuit includes at least one of a direction flowing into the power conversion circuit and a direction flowing out of the power conversion circuit, and the variable current circuit is provided with a first switching device, and the first switching device is used to control the on and off of the variable current circuit to adjust the driving switching rate of the power conversion circuit.

2. The power converter according to claim 1, characterized in that: The variable current circuit, whose current direction is to flow into the power conversion circuit, is used to adjust the driving opening rate of the power conversion circuit; The variable current circuit, whose current direction is to flow out of the power conversion circuit, is used to adjust the driving shutdown rate of the power conversion circuit.

3. The power converter according to claim 1, characterized in that: The driving circuit includes a push-pull circuit.

4. The power converter according to claim 3, characterized in that: One end of the variable current circuit whose current direction is flowing out of the power conversion circuit is connected to the power conversion circuit, and the other end of the variable current circuit whose current direction is flowing out of the power conversion circuit is connected to the low level end, output end or midpoint of the voltage stabilizing unit of the push-pull circuit.

5. The power converter according to claim 3, characterized in that: One end of the variable current circuit whose current direction flows into the power conversion circuit is connected to the power conversion circuit, and the other end of the variable current circuit whose current direction flows into the power conversion circuit is connected to the high level end or output end of the push-pull circuit.

6. The power converter according to claim 1, characterized in that: The power converter includes at least one variable current circuit whose current direction is to flow into the power conversion circuit and at least one variable current circuit whose current direction is to flow out of the power conversion circuit; The first switch device corresponding to the variable current circuit whose current direction is flowing into the power conversion circuit is interlocked with the first switch device corresponding to the variable current circuit whose current direction is flowing out of the power conversion circuit.

7. The power converter according to claim 1, characterized in that: The current directions of the plurality of variable current circuits are the same or different.

8. The power converter according to any one of claims 1 to 7, characterized in that: The variable current circuit includes a variable current unit and the first switch device connected in series, and the variable current unit is used to adjust the charging current or the discharging current of the power conversion circuit.

9. The power converter according to claim 8, characterized in that: The variable current unit includes at least one of a resistive device, a capacitive device, a unidirectional conductive device, and a bidirectional conductive device.

10. The power converter according to claim 9, characterized in that: The variable current unit includes a target transistor, and the first switch device and the target transistor are connected in series.

11. The power converter according to claim 8, characterized in that: The variable current circuit further includes an impedance unit connected to the variable current unit, the variable current unit and the impedance unit form a mirror current circuit, and the first switch device is used to control the variable current unit to provide a mirror current of the impedance unit.

12. A power supply device, characterized in that: include: A power converter as claimed in any one of claims 1 to 11.

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