Driving circuit of power device and electronic equipment

Abstract

The embodiment of the invention belongs to the driving technology of power devices, and provides a driving circuit of a power device and electronic equipment, and the driving circuit comprises a current input device and a current output device. The output end of the current input device is connected with the input end of the current output device; the output end of the current output device is connected with the control end of the power device; the current input device is configured to output a driving current, and the driving current can change the current magnitude under the control of the current input device; and the current output device is configured to output a driving signal of the power device according to the driving current. According to the invention, the problem of how to reduce the negative influence of the change of the driving current on the operation of the power device when the demand of the power device for the driving current is changed can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to a driving technology of a power device, and more particularly to a driving circuit and an electronic device of a power device. Background Art

[0002] Power devices such as power metal oxide semiconductor field effect transistors, insulated gate bipolar transistors, gallium nitride transistors and silicon carbide transistors are generally driven by a driving circuit. Specifically, the driving circuit provides a driving current to the control terminal (gate) of the power device.

[0003] In actual use, power devices generally have a stable drive current output from the drive circuit to the power device. When the power device's demand for drive current changes, it is necessary to disconnect the power device from the drive circuit before changing the drive current. This has the disadvantages of low drive efficiency of the power device, voltage or current mutations that occur when the power device is switched on and off, and thus affecting operation.

[0004] Therefore, when the demand of the power device for the driving current changes, how to reduce the negative impact of the change of the driving current on the operation of the power device still needs to be considered. Summary of the invention

[0005] The embodiments of the present application provide a driving circuit and electronic device for a power device, which can solve the problem of how to reduce the negative impact of the change in driving current on the operation of the power device when the demand for driving current of the power device changes.

[0006] In a first aspect, an embodiment of the present application provides a driving circuit of a power device, comprising: a current input device and a current output device;

[0007] The output end of the current input device is connected to the input end of the current output device;

[0008] The output end of the current output device is connected to the control end of the power device;

[0009] The current input device is configured to output a driving current, and the driving current can change the current magnitude under the control of the current input device;

[0010] The current output device is configured to output a driving signal of the power device according to the driving current.

[0011] The driving circuit provided in this embodiment includes a current input device and a current output device. The current input device is configured to output a driving current, and the driving current can change the current size under the control of the current input device. The current output device is configured to output the driving signal of the power device according to the driving current. When the driving demand of the power device for the control end changes, the current size of the driving current can be directly changed through the current input device, and the change of the current size of the driving current will affect the change of the driving signal, thereby meeting the driving demand of the power device for the control end. In other words, when the driving demand of the power device for the control end changes, it is not necessary to disconnect the connection between the driving circuit and the power device, which improves the driving efficiency of the power device and avoids the problem that the voltage or current mutation occurs at the instant of the power device switch and affects the operation. Therefore, the driving circuit provided in this embodiment can reduce the negative impact of the change of the driving current on the operation of the power device.

[0012] In addition, the current output device is used as a control-level circuit of the driving signal of the power device, and is arranged together with the current input device, so that the device size of the driving circuit can be greatly reduced.

[0013] In some embodiments of the present application, the current output device includes: a current pull-up unit and a current pull-down unit;

[0014] The first end of the current pull-up unit is connected to the output end of the current input device, the second end receives a first control signal, and the third end outputs a first driving signal;

[0015] The first end of the current pull-down unit is connected to the output end of the current input device, the second end receives the second control signal, and the third end outputs the second driving signal;

[0016] The current pull-up unit is configured to turn on the power device based on the first drive signal when the first control signal controls the third terminal of the current pull-up unit to output the first drive signal;

[0017] The current pull-down unit is configured to turn off the power device based on the second drive signal when the second control signal controls the third terminal of the current pull-down unit to output the second drive signal.

[0018] In the driving circuit provided in this embodiment, the current output device includes a current pull-up unit and a current pull-down unit. The current pull-up unit is configured to turn on the power device based on the first drive signal when the first control signal controls the third end of the current pull-up unit to output the first drive signal. The current pull-down unit is configured to turn off the power device based on the second drive signal when the second control signal controls the third end of the current pull-down unit to output the second drive signal. The power device can be turned on by the current pull-up unit, and the power device can be turned off by the current pull-down unit. By alternately outputting the first drive signal and the second drive signal by the current pull-up unit and the current pull-down unit, the function of controlling the power device to turn on and off can be achieved. In addition, the control of the first drive signal by the current pull-up unit and the control of the second drive signal by the current pull-down unit are both implemented under the control of the control signal, which has the advantages of being simple and fast, and can improve the driving efficiency of the power device.

[0019] In addition, the current pull-up unit and the current pull-down unit are arranged together with the current input device as control-level circuits of the driving signal of the power device, which can greatly reduce the device size of the driving circuit.

[0020] In some embodiments of the present application, the current pull-up unit includes: a first circuit and a second circuit;

[0021] The first end of the first circuit is connected to the output end of the current input device, the second end receives the first control signal, and the third end outputs the first drive signal;

[0022] The first end of the second circuit receives the first control signal, the second end and the third end are both connected to the first circuit, and the third end is also connected to the first power supply end;

[0023] The second circuit is configured to control the first circuit to be turned off when being turned on under the control of the first control signal.

[0024] In the driving circuit provided in this embodiment, the current pull-up unit includes a first circuit and a second circuit. When the first circuit is turned on, it is used to output a first driving signal to drive the power device to turn on. When the second circuit is turned on, it is used to control the first circuit to turn off, and at this time, the first circuit no longer outputs the first driving signal. Through the first circuit and the second circuit, the conduction of the power device can be controlled to meet different usage requirements of the power device and improve the use effect of the power device.

[0025] In some embodiments of the present application, the current pull-down unit includes: a third circuit and a fourth circuit;

[0026] The first end of the third circuit is connected to the output end of the current input device, the second end receives the second control signal, and the third end outputs the second drive signal;

[0027] The first end of the fourth circuit receives the second control signal, the second end and the third end are both connected to the third circuit, and the third end is also connected to the second power supply end;

[0028] The fourth circuit is configured to control the third circuit to be turned off when being turned on under the control of the second control signal;

[0029] Wherein, the voltage of the second power supply terminal is lower than the voltage of the first power supply terminal.

[0030] In the driving circuit provided in this embodiment, the current pull-down unit includes a third circuit and a fourth circuit. When the third circuit is turned on, it is used to output a third driving signal to drive the power device to turn off. When the fourth circuit is turned on, it is used to control the third circuit to turn off, and the third circuit no longer outputs the third driving signal. Through the third circuit and the fourth circuit, the power device can be turned off to cope with different usage requirements of the power device and improve the use effect of the power device.

[0031] In some embodiments of the present application, the first circuit includes a first control unit and a first amplification unit;

[0032] The first end of the first control unit is connected to the output end of the current input device, the second end receives the first control signal, and the third end is connected to the input end of the first amplification unit;

[0033] The output end of the first amplifying unit outputs the first driving signal;

[0034] The first control unit is configured to be turned off when the second circuit is turned on, and to be turned on when the second circuit is turned off.

[0035] In the driving circuit provided in this embodiment, the first circuit includes a first control unit and a first amplifying unit. The driving current can be received by the first control unit, and the current output by the first control unit can be amplified by the first amplifying unit and then output as the first driving signal. In this way, the driving current output by the current input device can be further amplified by the first amplifying unit, so that the driving signal can meet the driving requirements of the power device, and the driving ability of the driving circuit for the power device can be further improved.

[0036] In some embodiments of the present application, the first control unit includes a first signal processing unit and a first switch;

[0037] The input end of the first signal processing unit is used to receive the first control signal, and the output end is connected to the first end of the first switch;

[0038] The second end of the first switch is connected to the input end of the first amplifying unit;

[0039] The first signal processing unit is configured to output a first switch signal to the first switch after inverting the first control signal;

[0040] The first switch is configured to be turned on or off under the control of the first switch signal.

[0041] In the drive circuit provided in the present embodiment, the first control unit includes a first signal processing unit and a first switch. The first control signal can be inverted by the first signal processing unit, and the first switch signal obtained after the inversion processing is a signal inverted with the first control signal. The first control signal can control the conduction or shutoff of the second circuit, and the first switch signal can control the conduction or shutoff of the first switch. When the first switch is turned on, the first drive signal is output by the first amplifier circuit. The first control unit and the second circuit provided in the present embodiment share a control port (port A as shown in the figure), and the first signal processing unit is added to the first control unit, so that after the first control signal is input into the control port, the first circuit and the second circuit can be turned on at different times, which is simple and efficient. In addition, the first circuit and the second circuit share a control port, which reduces the size of the current pull-up unit, thereby reducing the size of the drive circuit.

[0042] In some embodiments of the present application, the third circuit includes a second control unit and a second amplification unit;

[0043] The first end of the second control unit is connected to the output end of the current input device, the second end receives the second control signal, and the third end is connected to the input end of the second amplification unit;

[0044] The output terminal of the second amplifying unit outputs the second driving signal.

[0045] In the driving circuit provided in this embodiment, the third circuit includes a second control unit and a second amplifying unit. The driving current can be received by the second control unit, and the current output by the second control unit can be amplified by the second amplifying unit and then output as the second driving signal. In this way, the driving current output by the current input device can be further amplified by the second amplifying unit, so that the driving signal can meet the driving requirements of the power device, and the driving ability of the driving circuit for the power device can be further improved.

[0046] In some embodiments of the present application, the second control unit includes a second signal processing unit and a second switch;

[0047] The input end of the second signal processing unit is used to receive the second control signal, and the output end is connected to the first end of the second switch;

[0048] The second end of the second switch is connected to the input end of the second amplifying unit;

[0049] The second signal processing unit is configured to output a second switch signal to the second switch after inverting the second control signal;

[0050] The second switch is configured to be turned on or off under the control of the second switch signal.

[0051] In the driving circuit provided in the present embodiment, the second control unit includes a second signal processing unit and a second switch. The second control signal can be inverted by the second signal processing unit, and the second switch signal obtained after the inversion processing is a signal inverted with the second control signal, and the second control signal can control the conduction or shutoff of the second circuit, and the second switch signal can control the conduction or shutoff of the second switch. When the second switch is turned on, the first drive signal is output by the second amplifier circuit. The second control unit and the second circuit provided in the present embodiment share a control port (port A as shown in the figure), and the second signal processing unit is added to the second control unit, so that after the second control signal is input into the control port, the first circuit and the second circuit can be turned on at different times, which is simple and efficient. In addition, the first circuit and the second circuit share a control port, which reduces the size of the current pull-up unit, thereby reducing the size of the driving circuit.

[0052] In some embodiments of the present application, the current input device includes: a current providing unit and a current processing unit;

[0053] The output end of the current providing unit is connected to the input end of the current output unit;

[0054] The output end of the current processing unit is connected to the input end of the current output device;

[0055] The current providing unit is configured to output a reference current, and the reference current can be controlled to change the current size;

[0056] The current processing unit is configured to output the driving current after amplifying the reference current.

[0057] In the driving circuit provided by the present embodiment, the current input device includes a current providing unit and a current processing unit. The current providing unit is configured to output a reference current, and the reference current can be controlled to change the current size. The current processing unit is configured to output the driving current after amplifying the reference current. By changing the size of the reference current output by the circuit providing unit, the size of the driving current output by the current processing unit can be changed, so as to cope with different driving requirements of the power device. And when the driving demand of the power device for the control end changes, the current size of the driving current can be directly changed by the current providing unit, and the change of the current size of the driving current will affect the change of the driving signal, so as to meet the driving demand of the power device for the control end. That is to say, when the driving demand of the power device for the control end changes, it is not necessary to disconnect the connection between the driving circuit and the power device, which improves the driving efficiency of the power device and avoids the problem that the voltage or current mutation occurs at the instant of the power device switch and affects the operation. Therefore, the driving circuit provided by the present embodiment can reduce the negative impact of the change of the driving current on the operation of the power device.

[0058] In some embodiments of the present application, the current processing unit includes a first amplifying circuit, a second amplifying circuit and a third amplifying circuit;

[0059] The input end of the first amplifier circuit is connected to the current providing unit, the output end is connected to the input end of the second amplifier circuit, and the output end is also connected to the input end of the third amplifier circuit;

[0060] The output end of the second amplifier circuit is connected to the input end of the current pull-up unit;

[0061] The output end of the third amplifier circuit is connected to the input end of the current pull-down unit.

[0062] In the driving circuit provided in this embodiment, the current processing unit includes a first amplifier circuit, a second amplifier circuit and a third amplifier circuit. The reference current output by the current providing unit is amplified by the first amplifier circuit and the second amplifier circuit, and then the driving current is output to the current pull-up unit. The reference current output by the current providing unit is amplified by the first amplifier circuit and the third amplifier circuit, and then the driving current is output to the current pull-down unit. Compared with the large-volume components required to set up a layer of amplifier circuits for current amplification, by setting up multiple layers of amplifier circuits for current amplification, the area of ​​the current amplification circuit structure can be reduced, the layout is convenient, and the size of the driving circuit is smaller.

[0063] In a second aspect, an embodiment of the present application provides an electronic device, comprising a driving circuit of a power device as described in the first aspect, and further comprising a power device, wherein the driving circuit is connected to a control terminal of the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0065] Figure 1 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0066] Figure 2 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0067] Figure 3 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0068] Figure 4 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0069] Figure 5 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0070] Figure 6 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0071] Figure 7 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application;

[0072] Figure 8 A schematic diagram of the structure of a driving circuit of a power device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0073] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0074] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0075] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0076] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] The terms "first" and "second" are only configured for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0078] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0080] See also Figure 1An embodiment of the present application provides a driving circuit 10 for a power device. The driving circuit 10 includes: a current input device 11 and a current output device 12.

[0081] The output end of the current input device 11 is connected to the input end of the current output device 12 .

[0082] The output end of the current output device 12 is connected to the control end of the power device 20. Optionally, the control end of the power device 20 is the gate of the power device 20.

[0083] The current input device 11 is configured to output a driving current, and the driving current can change the current size under the control of the current input device 11 .

[0084] The current output device 12 is configured to output a driving signal of the power device 20 according to the driving current.

[0085] The driving signal may be a driving current or a driving voltage.

[0086] Optionally, when the driving demand of the power device 20 for the control terminal changes, the driving signal can be changed by changing the current magnitude of the driving current. For example, when the driving voltage required by the power device 20 decreases, the driving current can be reduced. For example, when the driving voltage required by the power device 20 increases, the driving current can be increased.

[0087] Optionally, the current input device 11 outputs the driving current based on a reference current, and the reference current is a variable current, that is, by changing the reference current, the magnitude of the driving current output by the current input device 11 can be adjusted. When the driving requirement of the power device 20 for the control end changes, the driving requirement of the power device 20 for the control end can be met by directly changing the reference current. Optionally, the current input device 11 may include a programmable current source, which is used to output the reference current.

[0088] Optionally, a circuit with a changeable resistance value, such as a circuit including a variable resistor, may be provided in the current input device 11. By controlling the circuit with a changeable resistance value, the current magnitude of the driving current may be changed.

[0089] Optionally, other circuits may be provided in the current input device 11 as long as they can be used to change the current magnitude of the driving current.

[0090] Optionally, the current output device 12 may also process the driving current, such as amplifying or filtering the driving current, which is not limited in this embodiment.

[0091] The drive circuit 10 provided in this embodiment includes a current input device 11 and a current output device 12. The current input device 11 is configured to output a drive current, and the drive current can change the current size under the control of the current input device 11. The current output device 12 is configured to output the drive signal of the power device 20 according to the drive current. When the drive demand of the power device 20 for the control end changes, the current size of the drive current can be directly changed through the current input device 11, and the change of the current size of the drive current will affect the change of the drive signal, thereby meeting the drive demand of the power device 20 for the control end. In other words, when the drive demand of the power device 20 for the control end changes, it is not necessary to disconnect the connection between the drive circuit 10 and the power device 20, which improves the drive efficiency of the power device 20 and avoids the problem that the voltage or current mutation occurs at the moment of the power device 20 switch and affects the operation. Therefore, the drive circuit 10 provided in this embodiment can reduce the negative impact of the change of the drive current on the operation of the power device 20.

[0092] In addition, the current output device 12 is used as a control-level circuit of the driving signal of the power device 20 , and is arranged together with the current input device 11 , so that the device size of the driving circuit 10 can be greatly reduced.

[0093] See also Figure 2 In some embodiments, the current output device 12 includes: a current pull-up unit 13 and a current pull-down unit 14 .

[0094] The first end of the current pull-up unit 13 is connected to the output end of the current input device 11, the second end receives the first control signal, and the third end outputs the first drive signal. The current pull-up unit 13 receives the drive current output by the current input device 11. The current pull-up unit 13 generates the first drive signal based on the drive current and outputs it.

[0095] The current pull-up unit 13 is configured to turn on the power device 20 based on the first drive signal when the first control signal controls the third end of the current pull-up unit 13 to output the first drive signal. In other words, the first drive signal is used to turn on the power device 20. The first drive signal can be a high voltage signal. The first control signal is used to control whether the current pull-up unit 13 outputs the first drive signal. When the first control signal controls the current pull-up unit 13 not to output the first drive signal, the power device 20 is not turned on.

[0096] The first end of the current pull-down unit 14 is connected to the output end of the current input device 11, the second end receives the second control signal, and the third end outputs the second drive signal. The current pull-down unit 14 receives the drive current output by the current input device 11. The current pull-down unit 14 generates and outputs the second drive signal based on the drive current.

[0097] The current pull-down unit 14 is configured to shut down the power device 20 based on the second drive signal when the second control signal controls the third end of the current pull-down unit 14 to output the second drive signal. In other words, the second drive signal is used to shut down the power device 20. The second drive signal may be a low voltage signal. The second control signal is used to control whether the current pull-up unit 13 outputs the second drive signal. When the second control signal controls the current pull-up unit 13 not to output the second drive signal, the power device 20 maintains the current state, which may be conductive or non-conductive.

[0098] Optionally, the current pull-up unit 13 may include a transistor, a capacitor, a resistor, etc. One end of the transistor is connected to the high voltage power supply end, and the other end receives the driving current to achieve a pull-up effect on the driving current. The capacitor and the resistor can be used to filter out interference current. At this time, the current pull-down unit 14 is connected to the low voltage power supply end to achieve a pull-down effect on the driving current.

[0099] Optionally, the current pull-down unit 14 may include a transistor, a capacitor, a resistor, etc. One end of the transistor is connected to the low-voltage power supply end, and the other end receives the driving current to achieve a pull-down effect on the driving current. The capacitor and the resistor can be used to filter out interference current. At this time, the current pull-up unit 13 is connected to the high-voltage power supply end to achieve a pull-up effect on the driving current.

[0100] In the driving circuit 10 provided in this embodiment, the current output device 12 includes a current pull-up unit 13 and a current pull-down unit 14. The current pull-up unit 13 is configured to turn on the power device 20 based on the first drive signal when the first control signal controls the third end of the current pull-up unit 13 to output the first drive signal. The current pull-down unit 14 is configured to turn off the power device 20 based on the second drive signal when the second control signal controls the third end of the current pull-down unit 14 to output the second drive signal. The power device 20 can be turned on by the current pull-up unit 13, and the power device 20 can be turned off by the current pull-down unit 14. By alternately outputting the first drive signal and the second drive signal by the current pull-up unit 13 and the current pull-down unit 14, the function of controlling the power device 20 to be turned on and off can be achieved. In addition, the control of the first driving signal by the current pull-up unit 13 and the control of the second driving signal by the current pull-down unit 14 are both implemented under the control of the control signal, which has the advantages of being simple and fast and can improve the driving efficiency of the power device 20.

[0101] In addition, the current pull-up unit 13 and the current pull-down unit 14 are used as control-level circuits of the driving signal of the power device 20 , and are arranged together with the current input device 11 , so that the device size of the driving circuit 10 can be greatly reduced.

[0102] See also Figure 3 In some embodiments, the current pull-up unit 13 includes: a first circuit 130 and a second circuit 131 .

[0103] The first end of the first circuit 130 is connected to the output end of the current input device 11, the second end receives the first control signal, and the third end outputs the first drive signal. The first end of the first circuit 130 receives the drive current output by the current input device 11. The first drive signal acts on the control end of the power device 20 to drive the power device 20 to conduct.

[0104] The first end of the second circuit 131 receives the first control signal, the second end is connected to the first circuit 130, and the third end is connected to the first circuit 130. The third end is also connected to the first power supply end, which may be a high voltage power supply end.

[0105] The second circuit 131 is configured to control the first circuit 130 to be turned off when it is turned on under the control of the first control signal.

[0106] The second circuit 131 can be understood as a control circuit of the first circuit 130, which is used to control the first circuit 130 to be turned on or off. When the second circuit 131 is turned on, the first circuit 130 is turned off, and at this time, the first circuit 130 does not output the first drive signal. When the second circuit 131 is turned off, the first circuit 130 is turned on, and at this time, the first circuit 130 outputs the first drive signal.

[0107] The second circuit 131 is used to be turned on or off under the control of the first control signal.

[0108] Optionally, when the first control signal is a high voltage signal, the second circuit 131 is turned off, and correspondingly, the first circuit 130 is turned on, and at this time, the third terminal of the first circuit 130 outputs the first drive signal. The first drive signal is used to drive the power device 20 to turn on.

[0109] Optionally, when the first control signal is a low voltage signal, the second circuit 131 is turned on, and correspondingly, the first circuit 130 is turned off. At this time, the first circuit 130 does not output the first driving signal.

[0110] Optionally, the first circuit 130 may further process the driving current and then output the first driving signal. The processing may include amplification processing, filtering processing, etc., which is not limited in this embodiment.

[0111] Optionally, both the first circuit 130 and the second circuit 131 may include transistors.

[0112] In the driving circuit 10 provided in this embodiment, the current pull-up unit 13 includes a first circuit 130 and a second circuit 131. When the first circuit 130 is turned on, it is used to output a first driving signal to drive the power device 20 to turn on. When the second circuit 131 is turned on, it is used to control the first circuit 130 to turn off, and at this time, the first circuit 130 no longer outputs the first driving signal. Through the first circuit 130 and the second circuit 131, the conduction of the power device 20 can be controlled to meet different usage requirements of the power device 20 and improve the use effect of the power device 20.

[0113] See also Figure 3 In some embodiments, the current pull-down unit 14 includes: a third circuit 140 and a fourth circuit 141 .

[0114] The first end of the third circuit 140 is connected to the output end of the current input device 11, the second end receives the second control signal, and the third end outputs the second drive signal. The first end of the third circuit 140 receives the drive current output by the current input device 11. The second drive signal acts on the control end of the power device 20 to drive the power device 20 to turn off.

[0115] The first end of the fourth circuit 141 receives the second control signal, the second end is connected to the third circuit 140, and the third end is connected to the third circuit 140. The third end is also connected to a second power supply end, wherein the voltage of the second power supply end is lower than the voltage of the first power supply end, and the second power supply end may be a low voltage power supply end (e.g., a ground end).

[0116] The fourth circuit 141 is configured to control the third circuit 140 to be turned off when it is turned on under the control of the second control signal.

[0117] The fourth circuit 141 can be understood as a control circuit of the third circuit 140, which is used to control the third circuit 140 to be turned on or off. When the fourth circuit 141 is turned on, the third circuit 140 is turned off, and the third circuit 140 does not output the third drive signal. When the fourth circuit 141 is turned off, the third circuit 140 is turned on, and the third circuit 140 outputs the third drive signal.

[0118] The fourth circuit 141 is used to be turned on or off under the control of the third control signal.

[0119] Optionally, when the third control signal is a low voltage signal, the fourth circuit 141 is turned off, and correspondingly, the third circuit 140 is turned on, and at this time, the third end of the third circuit 140 outputs the third drive signal. The third drive signal is used to drive the power device 20 to turn on.

[0120] Optionally, when the third control signal is a high voltage signal, the fourth circuit 141 is turned on, and correspondingly, the third circuit 140 is turned off. At this time, the third circuit 140 does not output the third driving signal.

[0121] Optionally, the third circuit 140 may further process the driving current and then output the third driving signal. The processing may include amplification processing, filtering processing, etc., which is not limited in this embodiment.

[0122] Optionally, the third circuit 140 and the fourth circuit 141 may both include transistors.

[0123] In the driving circuit 10 provided in this embodiment, the current pull-down unit 14 includes a third circuit 140 and a fourth circuit 141. When the third circuit 140 is turned on, it is used to output a third driving signal to drive the power device 20 to turn off. When the fourth circuit 141 is turned on, it is used to control the third circuit 140 to turn off, and at this time, the third circuit 140 no longer outputs the third driving signal. Through the third circuit 140 and the fourth circuit 141, the power device 20 can be turned off to cope with different usage requirements of the power device 20 and improve the use effect of the power device 20.

[0124] See also Figure 4 In some embodiments, the first circuit 130 includes a first control unit 1301 and a first amplifying unit 1302 .

[0125] The first control unit 1301 has a first terminal connected to the output terminal of the current input device 11 , a second terminal receiving the first control signal, and a third terminal connected to the input terminal of the first amplifying unit 1302 .

[0126] The output terminal of the first amplifying unit 1302 outputs the first driving signal.

[0127] The first control unit 1301 can be understood as a switch, which is used to control whether the first amplifying unit 1302 outputs the first driving signal. When the first control unit 1301 is turned on, the first amplifying unit 1302 can output the first driving signal.

[0128] The first control unit 1301 is turned on or off under the control of the second circuit 131 as described above. That is, the first control unit 1301 is configured to be turned off when the second circuit 131 is turned on, and is also configured to be turned on when the second circuit 131 is turned off.

[0129] The first amplifying unit 1302 is used to amplify the current output by the first control unit 1301 and then output the first driving signal. The amplification factor during the amplification process can be selected according to actual needs and is not limited in this embodiment. The current input by the first control unit 1301 is the driving current, and the magnitude of the output current is equal to the magnitude of the driving current.

[0130] Optionally, the first control unit 1301 may include a transistor, and the first amplification unit 1302 may include a current mirror. The current mirror may be composed of two transistors.

[0131] In the driving circuit 10 provided in this embodiment, the first circuit 130 includes a first control unit 1301 and a first amplifying unit 1302. The driving current can be received by the first control unit 1301, and the current output by the first control unit 1301 can be amplified by the first amplifying unit 1302 to output the first driving signal. In this way, the driving current output by the current input device 11 can be further amplified by the first amplifying unit 1302, so that the driving signal can meet the driving requirements of the power device 20, and the driving capability of the driving circuit 10 for the power device 20 can be further improved.

[0132] See also Figure 4In some embodiments, the third circuit 140 includes a second control unit 1401 and a second amplifying unit 1402 .

[0133] The first end of the second control unit 1401 is connected to the output end of the current input device 11 , the second end receives the second control signal, and the third end is connected to the input end of the second amplifying unit 1402 .

[0134] The output terminal of the second amplifying unit 1402 outputs the second driving signal.

[0135] The second control unit 1401 can be understood as a switch, which is used to control whether the second amplifying unit 1402 outputs the second driving signal. When the second control unit 1401 is turned on, the second amplifying unit 1402 can output the second driving signal.

[0136] The second control unit 1401 is turned on or off under the control of the fourth circuit 141 as described above. That is, the second control unit 1401 is configured to be turned off when the fourth circuit 141 is turned on, and is also configured to be turned on when the fourth circuit 141 is turned off.

[0137] The second amplifying unit 1402 is used to amplify the current output by the second control unit 1401 and then output the second driving signal. The amplification factor during the amplification process can be selected according to actual needs and is not limited in this embodiment. The current input by the second control unit 1401 is the driving current, and the magnitude of the output current is equal to the magnitude of the driving current.

[0138] Optionally, the second control unit 1401 may include a transistor, and the second amplification unit 1402 may include a current mirror. The current mirror may be composed of two transistors.

[0139] In the driving circuit 10 provided in this embodiment, the third circuit 140 includes a second control unit 1401 and a second amplifying unit 1402. The driving current can be received by the second control unit 1401, and the current output by the second control unit 1401 can be amplified by the second amplifying unit 1402 and then output as the second driving signal. In this way, the driving current output by the current input device 11 can be further amplified by the second amplifying unit 1402, so that the driving signal can meet the driving requirements of the power device 20, and the driving capability of the driving circuit 10 for the power device 20 can be further improved.

[0140] See also Figure 5 In some embodiments, the first control unit 1301 includes a first signal processing unit 1303 and a first switch 1304 .

[0141] The input end of the first signal processing unit 1303 is used to receive the first control signal, and the output end is connected to the first end of the first switch 1304. The second end of the first switch 1304 is connected to the input end of the first amplifying unit 1302.

[0142] The first signal processing unit 1303 is configured to invert the first control signal and then output the first switch signal to the first switch 1304. The first switch 1304 is configured to be turned on or off under the control of the first switch signal.

[0143] After the first control signal is inverted by the first signal processing unit 1303 , the output first switch signal and the first control signal are mutually inverted signals.

[0144] The second circuit 131 receives the first control signal, and the first switch 1304 receives the first switch signal. Since the first control signal and the first switch signal are in antiphase, the first switch 1304 is turned off when the second circuit 131 is turned on, and the first switch 1304 is turned on when the second circuit 131 is turned off. When the first switch 1304 is turned on, the first amplifier circuit 112 outputs the first drive signal. When the first switch 1304 is turned off, no current flows through the first amplifier circuit 112.

[0145] Optionally, the first control signal may be a square wave signal, and the first switch signal is a square wave signal that is inverted with respect to the first control signal. When the first control signal is at a high level, the first switch signal is at a low level. Similarly, when the first control signal is at a low level, the first switch signal is at a high level.

[0146] Optionally, the first signal processing unit 1303 may be an inverter as shown in the figure. The first signal processing unit 1303 may also be other devices capable of performing signal inversion processing, which is not limited in this embodiment.

[0147] Optionally, the first switch 1304 may be a transistor Q3 as shown in the figure. The first switch 1304 may also be other switches that can be turned on and off under the control of the first switch signal, which is not limited in this embodiment.

[0148] Optionally, the first amplifier circuit 112 may include a transistor Q4 and a transistor Q2 as shown in the figure, and the transistor Q4 and the transistor Q2 form a current mirror, which is used to amplify the current output by the first switch 1304 and then output the first drive signal. The first amplifier circuit 112 may also include other circuit structures capable of amplifying the current, which is not limited in this embodiment.

[0149] Optionally, the second circuit 131 may be a transistor Q1 as shown in the figure. The second circuit 131 may also include other circuit structures, which are not limited in this embodiment.

[0150] In the driving circuit 10 provided in this embodiment, the first control unit 1301 includes a first signal processing unit 1303 and a first switch 1304. The first signal processing unit 1303 can perform inversion processing on the first control signal, and the first switch signal obtained after the inversion processing is a signal inverted with the first control signal. The first control signal can control the conduction or disconnection of the second circuit 131, and the first switch signal can control the conduction or disconnection of the first switch 1304. When the first switch 1304 is turned on, the first amplifier circuit 112 outputs the first drive signal. The first control unit 1301 and the second circuit 131 provided in this embodiment share a control port (port A as shown in the figure). By adding the first signal processing unit 1303 to the first control unit 1301, after the first control signal is input to the control port, the first circuit 130 and the second circuit 131 can be turned on at different times, which is simple and efficient. In addition, the first circuit 130 and the second circuit 131 share a control port, which reduces the size of the current pull-up unit 13 and further reduces the size of the driving circuit 10 .

[0151] See also Figure 5 In some embodiments, the second control unit 1401 includes a second signal processing unit 1403 and a second switch 1404 .

[0152] The input end of the second signal processing unit 1403 is used to receive the second control signal, and the output end is connected to the first end of the second switch 1404. The second end of the second switch 1404 is connected to the input end of the second amplifying unit 1402.

[0153] The second signal processing unit 1403 is configured to invert the second control signal and then output a second switch signal to the second switch 1404. The second switch 1404 is configured to be turned on or off under the control of the second switch signal.

[0154] After the second control signal is inverted by the second signal processing unit 1403 , the output second switch signal and the second control signal are signals that are inverted from each other.

[0155] The second circuit 131 receives the second control signal, and the second switch 1404 receives the second switch signal. Since the second control signal and the second switch signal are in antiphase, the second switch 1404 is turned off when the second circuit 131 is turned on, and the second switch 1404 is turned on when the second circuit 131 is turned off. When the second switch 1404 is turned on, the second amplifier circuit 113 outputs the first drive signal. When the second switch 1404 is turned off, no current flows through the second amplifier circuit 113.

[0156] Optionally, the second control signal may be a square wave signal, and the second switch signal is a square wave signal that is inverted with respect to the second control signal. When the second control signal is at a high level, the second switch signal is at a low level. Similarly, when the second control signal is at a low level, the second switch signal is at a high level.

[0157] Optionally, the second signal processing unit 1403 may be an inverter as shown in the figure. The second signal processing unit 1403 may also be other devices capable of performing signal inversion processing, which is not limited in this embodiment.

[0158] Optionally, the second switch 1404 may be a transistor Q7 as shown in the figure. The second switch 1404 may also be other switches that can be turned on and off under the control of the second switch signal, which is not limited in this embodiment.

[0159] Optionally, the second amplifier circuit 113 may include a transistor Q5 and a transistor Q8 as shown in the figure, and the transistor Q5 and the transistor Q8 form a current mirror, which is used to amplify the current output by the second switch 1404 and then output the first drive signal. The second amplifier circuit 113 may also include other circuit structures capable of amplifying the current, which is not limited in this embodiment.

[0160] Optionally, the second circuit 131 may be a transistor Q6 as shown in the figure. The second circuit 131 may also include other circuit structures, which are not limited in this embodiment.

[0161] In the driving circuit 10 provided in this embodiment, the second control unit 1401 includes a second signal processing unit 1403 and a second switch 1404. The second control signal can be inverted by the second signal processing unit 1403, and the second switch signal obtained after the inversion processing is a signal inverted with the second control signal. The second control signal can control the conduction or disconnection of the second circuit 131, and the second switch signal can control the conduction or disconnection of the second switch 1404. When the second switch 1404 is turned on, the first drive signal is output by the second amplifier circuit 113. The second control unit 1401 and the second circuit 131 provided in this embodiment share a control port (port A as shown in the figure). By adding the second signal processing unit 1403 to the second control unit 1401, after the second control signal is input to the control port, the first circuit 130 and the second circuit 131 can be turned on at different times, which is simple and efficient. In addition, the first circuit 130 and the second circuit 131 share a control port, which reduces the size of the current pull-up unit 13 and further reduces the size of the driving circuit 10 .

[0162] See also Figure 6 In some embodiments, the current input device 11 includes a current providing unit 110 and a current processing unit 111 .

[0163] The output end of the current providing unit 110 is connected to the input end of the current output unit. The current providing unit 110 is configured to output a reference current, and the reference current can be controlled to change the current size.

[0164] Optionally, the current providing unit 110 may be a programmable current source, which outputs a reference current, and the reference current can be controlled to change the current size according to actual needs.

[0165] Optionally, the current providing unit 110 may include a current source and a variable resistor, one end of the variable resistor is connected to the current source, and the other end is connected to the input end of the current processing unit 111. The current source outputs an original current, and the original current becomes the reference current after passing through the variable resistor. By changing the resistance value of the variable resistor, the current size of the reference current can be controlled.

[0166] Optionally, the current providing unit 110 may further include other circuit structures, which are not limited in this embodiment.

[0167] The output end of the current processing unit 111 is connected to the input end of the current output device 12. The current processing unit 111 is configured to amplify the reference current and then output the driving current.

[0168] Optionally, a current mirror may be provided in the current processing unit 111 to amplify the reference current through the current mirror.

[0169] Optionally, an amplifier may be provided in the current processing unit 111 to amplify the reference current.

[0170] Optionally, a multi-layer circuit structure may be provided in the current processing unit 111, each layer of the circuit structure is used to perform amplification processing on the reference current, and the current processing unit 111 may perform multi-layer amplification processing on the reference current. The multi-layer circuit structure may include multi-layer amplifier circuits of different types, or may include multi-layer amplifier circuits of the same type, for example, the multi-layer circuit structure includes multiple current mirrors, and the multiple current mirrors are connected in series.

[0171] Optionally, when the current output device 12 includes the current pull-up unit 13 and the current pull-down unit 14 , the current processing unit 111 includes two output ends, one output end is connected to the input end of the current pull-up unit 13 , and the other output end is connected to the input end of the current pull-down unit 14 .

[0172] In the driving circuit 10 provided in this embodiment, the current input device 11 includes a current providing unit 110 and a current processing unit 111. Among them, the current providing unit 110 is configured to output a reference current, and the reference current can be controlled to change the current size. The current processing unit 111 is configured to output the driving current after amplifying the reference current. By changing the size of the reference current output by the circuit providing unit, the size of the driving current output by the current processing unit 111 can be changed, so as to cope with different driving requirements of the power device 20. And when the driving requirement of the power device 20 for the control end changes, the current size of the driving current can be directly changed by the current providing unit 110, and the change of the current size of the driving current will affect the change of the driving signal, thereby meeting the driving requirement of the power device 20 for the control end. In other words, when the driving requirement of the power device 20 for the control end changes, it is not necessary to disconnect the connection between the driving circuit 10 and the power device 20, which improves the driving efficiency of the power device 20 and avoids the problem that the voltage or current mutation has been generated at the moment of the power device 20 switch and affects the operation. Therefore, the driving circuit 10 provided in this embodiment can reduce the negative impact of the change of the driving current on the operation of the power device 20.

[0173] See also Figure 7 and Figure 8 In some embodiments, the current processing unit 111 includes a first amplifier circuit 112 , a second amplifier circuit 113 , and a third amplifier circuit 114 .

[0174] The input end of the first amplifier circuit 112 is connected to the current providing unit 110, the output end is connected to the input end of the second amplifier circuit 113, and the output end is also connected to the input end of the third amplifier circuit 114. The first amplifier circuit 112 may include a current mirror, for example, Figure 7 The transistor Q9 and the transistor Q10 shown, wherein the transistor Q9 and the transistor Q10 form a current mirror, can amplify the reference current.

[0175] The output end of the second amplifier circuit 113 is connected to the input end of the current pull-up unit 13. The second amplifier circuit 113 may include: Figure 7 The transistor Q11 shown, or comprising Figure 8 The current mirror shown.

[0176] The output end of the third amplifier circuit 114 is connected to the input end of the current pull-down unit 14. The third amplifier circuit 114 may include: Figure 7 The current mirror shown, or including Figure 8 Transistor Q11 is shown.

[0177] Optionally, the current processing unit 111 may further include other amplifying circuits, and may further include other functional circuits such as a filtering circuit, a voltage stabilizing circuit, etc., which are not limited in this embodiment.

[0178] like Figure 7 or Figure 8 As shown, the reference current is amplified multiple times and then output as a driving signal.

[0179] like Figure 7 As shown, specifically, when the reference current passes through the current pull-up circuit, the reference current passes through the current mirror composed of transistor Q9 and transistor Q10 and the transistor Q11, and the reference current is amplified in a ratio of 1:a:b to form the driving current. When the first switch 1304 (transistor Q3 as shown in the figure) is turned on, the driving current passes through the first switch 1304 and is amplified by the first amplifier circuit 112 (current mirror composed of transistor Q4 and transistor Q2 as shown in the figure) in a ratio of 1:d, and is output as the first driving signal.

[0180] Specifically, when the reference current passes through the current pull-down circuit, the reference current passes through a current mirror composed of transistors Q9 and Q10 and another current mirror (the third amplifier circuit 114), and the reference current is amplified to form the drive current. When the second switch 1404 (transistor Q7 as shown in the figure) is turned on, the drive current passes through the second switch 1404 and is amplified by the second amplifier circuit 113 (current mirror composed of transistors Q5 and Q8 as shown in the figure) at a ratio of 1:e, and is output as the second drive signal.

[0181] In the driving circuit 10 provided in this embodiment, the current processing unit 111 includes a first amplifier circuit 112, a second amplifier circuit 113 and a third amplifier circuit 114. The reference current output by the current providing unit 110 is amplified by the first amplifier circuit 112 and the second amplifier circuit 113, and then the driving current is output to the current pull-up unit 13. The reference current output by the current providing unit 110 is amplified by the first amplifier circuit 112 and the third amplifier circuit 114, and then the driving current is output to the current pull-down unit 14. Compared with the need to use large-volume components to set up a layer of amplifier circuits for current amplification, by setting up multiple layers of amplifier circuits for current amplification, the area of ​​the current amplification circuit structure can be reduced, the layout is convenient, and the size of the driving circuit 10 is smaller.

[0182] An embodiment of the present application further provides an electronic device, which includes a driving circuit 10 of a power device as provided in any of the above embodiments, and also includes a power device 20. The driving circuit 10 is connected to a control terminal of the power device 20.

[0183] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0184] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A driving circuit for a power device, characterized in that: include: a current input device and a current output device; The output end of the current input device is connected to the input end of the current output device; The output end of the current output device is connected to the control end of the power device; The current input device is configured to output a driving current, and the driving current can change the current magnitude under the control of the current input device; The current output device is configured to output a driving signal of the power device according to the driving current.

2. The driving circuit according to claim 1, characterized in that: The current output device comprises: a current pull-up unit and a current pull-down unit; The first end of the current pull-up unit is connected to the output end of the current input device, the second end receives a first control signal, and the third end outputs a first driving signal; The first end of the current pull-down unit is connected to the output end of the current input device, the second end receives the second control signal, and the third end outputs the second driving signal; The current pull-up unit is configured to turn on the power device based on the first drive signal when the first control signal controls the third terminal of the current pull-up unit to output the first drive signal; The current pull-down unit is configured to turn off the power device based on the second drive signal when the second control signal controls the third terminal of the current pull-down unit to output the second drive signal.

3. The driving circuit according to claim 2, characterized in that: The current pull-up unit comprises: a first circuit and a second circuit; The first end of the first circuit is connected to the output end of the current input device, the second end receives the first control signal, and the third end outputs the first drive signal; The first end of the second circuit receives the first control signal, the second end and the third end are both connected to the first circuit, and the third end is also connected to the first power supply end; The second circuit is configured to control the first circuit to be turned off when being turned on under the control of the first control signal.

4. The driving circuit according to claim 3, characterized in that: The current pull-down unit comprises: a third circuit and a fourth circuit; The first end of the third circuit is connected to the output end of the current input device, the second end receives the second control signal, and the third end outputs the second drive signal; The first end of the fourth circuit receives the second control signal, the second end and the third end are both connected to the third circuit, and the third end is also connected to the second power supply end; The fourth circuit is configured to control the third circuit to be turned off when being turned on under the control of the second control signal; Wherein, the voltage of the second power supply terminal is lower than the voltage of the first power supply terminal.

5. The driving circuit according to claim 4, characterized in that: The first circuit includes a first control unit and a first amplification unit; The first end of the first control unit is connected to the output end of the current input device, the second end receives the first control signal, and the third end is connected to the input end of the first amplification unit; The output end of the first amplifying unit outputs the first driving signal; The first control unit is configured to be turned off when the second circuit is turned on, and to be turned on when the second circuit is turned off.

6. The driving circuit according to claim 5, characterized in that: The first control unit includes a first signal processing unit and a first switch; The input end of the first signal processing unit is used to receive the first control signal, and the output end is connected to the first end of the first switch; The second end of the first switch is connected to the input end of the first amplifying unit; The first signal processing unit is configured to output a first switch signal to the first switch after inverting the first control signal; The first switch is configured to be turned on or off under the control of the first switch signal.

7. The driving circuit according to claim 5, characterized in that: The third circuit includes a second control unit and a second amplification unit; The first end of the second control unit is connected to the output end of the current input device, the second end receives the second control signal, and the third end is connected to the input end of the second amplification unit; The output terminal of the second amplifying unit outputs the second driving signal The second control unit is configured to be turned off when the fourth circuit is turned on, and to be turned on when the fourth circuit is turned off.

8. The driving circuit according to claim 7, characterized in that: The second control unit includes a second signal processing unit and a second switch; The input end of the second signal processing unit is used to receive the second control signal, and the output end is connected to the first end of the second switch; The second end of the second switch is connected to the input end of the second amplifying unit; The second signal processing unit is configured to output a second switch signal to the second switch after inverting the second control signal; The second switch is configured to be turned on or off under the control of the second switch signal.

9. The driving circuit according to any one of claims 2 to 8, characterized in that: The current input device comprises: a current providing unit and a current processing unit; The output end of the current providing unit is connected to the input end of the current output unit; The output end of the current processing unit is connected to the input end of the current output device; The current providing unit is configured to output a reference current, and the reference current can be controlled to change the current size; The current processing unit is configured to output the driving current after amplifying the reference current.

10. The driving circuit according to claim 9, characterized in that: The current processing unit includes a first amplifying circuit, a second amplifying circuit and a third amplifying circuit; The input end of the first amplifier circuit is connected to the current providing unit, the output end is connected to the input end of the second amplifier circuit, and the output end is also connected to the input end of the third amplifier circuit; The output end of the second amplifier circuit is connected to the input end of the current pull-up unit; The output end of the third amplifier circuit is connected to the input end of the current pull-down unit.

11. An electronic device, characterized in that: A driving circuit comprising a power device as claimed in any one of claims 1 to 10, further comprising a power device; The driving circuit is connected to the control terminal of the power device.

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