Power conversion device

Abstract

The embodiment of the invention provides a power conversion device, the power conversion device comprises a power switch tube and a driving circuit group corresponding to the power switch tube, and the driving circuit group comprises a first driving circuit and a second driving circuit; the first driving circuit is used for outputting a first driving voltage to the power switch tube and the second driving circuit based on the driving control signal; the second driving circuit comprises a first switching circuit and a second switching circuit which are connected in series, and the first switching circuit is used for being switched on or switched off based on the first driving circuit; the second switching circuit is used for being switched on or switched off based on the first mode control signal; and the second driving circuit outputs a second driving voltage to the power switch tube when the first switch circuit and the second switch circuit are both switched on. By implementing the embodiment of the invention, the working synchronization rate among the sub-driving circuits when the driving circuit switches different driving modes can be improved, so that the driving performance of the driving circuit is improved.

Description

A power conversion device Technical Field

[0001] This application relates to the field of electronic technology, and more particularly to a power conversion device. Background Technology

[0002] Power conversion devices (such as DC-DC converters and inverters) are the core of modern energy systems, their core task being the efficient and reliable conversion and control of electrical energy. In these devices, the drive circuit controls the switching on and off of power devices (such as metal-oxide-semiconductor field-effect transistors and insulated-gate bipolar transistors). Its driving capability directly determines the switching speed of the power devices, thus affecting the overall performance of the device. Faster switching speeds result in lower switching losses during the switching process, contributing to improved energy conversion efficiency. Conversely, slower switching speeds lead to lower rates of change (dv / dt, di / dt) of voltage and current during switching, reducing electromagnetic interference and ensuring stable operation of the system and surrounding electronic equipment. Therefore, one of the core requirements of drive circuit design is to rationally select the switching scheme (i.e., adjust the drive speed) of the power devices based on their different operating conditions (e.g., prioritizing electromagnetic interference under light loads and efficiency under heavy loads) to achieve a balance between switching losses and electromagnetic interference. Summary of the Invention

[0003] This application provides a power conversion device with multiple drive circuits. By selectively activating different drive circuits, the drive mode can be dynamically adjusted. Furthermore, the power conversion device provided in this application can ensure the synchronization rate between the drive circuits when switching between different drive modes, thus guaranteeing the drive performance of the drive circuits.

[0004] In a first aspect, embodiments of this application provide a power conversion device, which includes: a power switch transistor and a driving circuit group corresponding to the power switch transistor. The driving circuit group includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the control electrode of the power switch transistor and the second driving circuit, and is used to receive a driving control signal and output a first driving voltage to the power switch transistor and the second driving circuit. The second driving circuit includes a first switching circuit and a second switching circuit connected in series. The first switching circuit is connected to the first driving circuit and is used to turn on or off based on the first driving voltage. The second switching circuit is connected to receive a first mode control signal and is used to turn on or off. The second driving circuit is connected to the control electrode of the power switch transistor, and when both the first and second switching circuits are on, the second driving circuit outputs a second driving voltage to the control electrode of the power switch transistor. Both the first driving voltage and the second driving voltage are used to turn the power switch transistor on or off.

[0005] In this application, the power conversion device has multiple driving modes to adapt to the working requirements under different operating conditions. Specifically, the power conversion device includes a first driving circuit and a second driving circuit. When the power conversion device needs to reduce the driving speed (such as when the power conversion device is under light load), the second driving circuit can be turned off, and only the first driving circuit provides the driving voltage (i.e., the first driving voltage) to the power switch. This can be understood as a slow driving mode. When the power conversion device needs to increase the driving speed (such as when the power conversion device is under heavy load), the second driving circuit can be turned on, so that the first driving circuit and the second driving circuit simultaneously output driving voltage to the power switch to improve the turn-on / turn-off speed of the power switch. This can be understood as a fast driving mode. Furthermore, to prevent time delays in the arrival of control signals (such as pulse width modulation signals) at the two drive circuits, which could lead to poor driving effects, this embodiment of the application includes a first switching circuit and a second switching circuit in the second drive circuit. The first switching circuit is turned on or off based on the first driving voltage output by the first drive circuit, while the second switching circuit is turned on or off based on the first mode control signal. The second driving voltage is only output to the power switch when both the first and second switching circuits are on. It can be seen that when the second switching circuit is on, the first switching circuit can be turned on or off based on the first driving voltage, ensuring that the second driving voltage output by the second drive circuit and the first driving voltage output by the first drive circuit to the power switch are synchronously output at high and / or low levels. This improves the working synchronization rate between the various sub-drive circuits when switching between different drive modes, thereby improving the driving performance of the drive circuit.

[0006] In conjunction with the first aspect, in one possible implementation, when the power conversion device is in a first driving mode, a first mode control signal controls the second switching circuit to turn off, and the power switch is turned on or off based on the first driving voltage; when the power conversion device is in a second driving mode, the first mode control signal controls the second switching circuit to turn on, and the power switch is turned on or off based on the first driving voltage and the second driving voltage; wherein, the first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs a second driving voltage to the power switch when the first driving voltage is at the first level, and the second driving voltage is at the first level. In this application, when the power conversion device is in the first driving mode (or slow driving mode), the first mode control signal can control the second switching circuit to turn off. At this time, only the first driving circuit provides the driving voltage (i.e., the first driving voltage) to the power switching transistor. When the power conversion device is in the second driving mode (or fast driving mode), the first mode control signal can control the second switching circuit to turn on. At this time, whether the second driving circuit is on or off depends only on whether the first switching circuit is on or off. It can be understood that when the first driving voltage controls the first switching circuit to turn on, the second driving circuit outputs the second driving voltage to the power switching transistor. Thus, the first driving circuit and the second driving circuit can simultaneously output driving voltages (i.e., the first driving voltage and the second driving voltage) to the power switching transistor to improve the turn-on / turn-off speed of the power switching transistor. It can be considered that the power conversion device in the embodiments of this application, while having multiple driving modes, can also ensure that each sub-driving circuit can maintain synchronous output of high and / or low levels when switching between driving modes, thus ensuring driving performance.

[0007] In conjunction with the first aspect, in one possible implementation, the drive circuit group further includes a third drive circuit, which includes a third switching circuit and a fourth switching circuit. The third switching circuit is connected to the first drive circuit and is used to turn on or off based on a first drive voltage output by the first drive circuit. The fourth switching circuit is used to turn on or off upon receiving a second mode control signal. When both the third and fourth switching circuits are on, the third drive circuit outputs a third drive voltage to the control electrode of the power switch to turn the power switch on or off. The third drive voltage has the same polarity as the second drive voltage. In this application, the drive circuit group of the power conversion device may also include a third drive circuit, similar to the second drive circuit, which includes a third switching transistor and a fourth switching transistor. The third switching circuit turns on or off based on the first drive voltage output by the first drive circuit, and the fourth switching circuit turns on or off based on the second mode control signal. For example, when the power conversion device needs to reduce the drive speed, the second and third drive circuits can be turned off, and only the first drive circuit provides the drive voltage (i.e., the first drive voltage) to the power switch. This can be understood as a slow drive mode. When the power conversion device needs to increase the drive speed, the second (or third) drive circuit can be turned on, so that the first and second (or first and third) drive circuits simultaneously output drive voltages to the power switch, thereby increasing the turn-on / turn-off speed of the power switch. This can be understood as a fast drive mode. When the power conversion device needs to further increase the drive speed, the second and third drive circuits can be turned on, so that the first, second, and third drive circuits simultaneously output drive voltages to the power switch, thereby increasing the turn-on / turn-off speed of the power switch. This can be understood as an ultra-fast drive mode. It can be seen that the power conversion device provided in this application embodiment can provide multiple levels of fast drive modes to meet the working requirements of different operating conditions.

[0008] In conjunction with the first aspect, in one possible implementation, when the power conversion device is in the first driving mode, the first mode control signal controls the second switching circuit to turn off, and the second mode control signal controls the fourth switching circuit to turn off. The power switching transistor is turned on or off based on the first driving voltage. In this application, when the power conversion device is in the first driving mode (or "slow driving mode" or "slow turn-on and slow turn-off mode"), the first mode control signal controls the second switching circuit to turn off, and the second mode control signal controls the fourth switching circuit to turn off. The power switching transistor is driven only by the first driving voltage output by the first driving circuit. At this time, the power conversion device (or driving circuit) is in the slow driving mode (or "slow turn-on and slow turn-off mode") to meet the operating requirement of the power conversion circuit to "reduce the driving speed".

[0009] In conjunction with the first aspect, in one possible implementation, when the power conversion device is in the second driving mode, a first mode control signal controls the second switching circuit to turn on, and a second control signal controls the fourth switching circuit to turn off. The power switch is turned on or off based on a first driving voltage and a second driving voltage. The first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs a second driving voltage to the power switch when the first driving voltage is at a first level, with the second driving voltage being at the first level. Alternatively, when the power conversion device is in the second driving mode, a first mode control signal controls the second switching circuit to turn off, and a second control signal controls the fourth switching circuit to turn on. The power switch is turned on or off based on a first driving voltage and a third driving voltage. The third switching circuit is turned on when the first driving voltage is at a first level, and the third driving circuit outputs a third driving voltage to the power switch when the first driving voltage is at a first level, with the third driving voltage being at the first level. In this application, when the power conversion device is in the second driving mode (or referred to as "first-level fast driving mode", "slow turn-on fast turn-off mode" or "fast turn-on slow turn-off mode"), the first mode control signal controls the second switching circuit to turn on, and the second mode control signal controls the fourth switching circuit to turn off. The power switching transistor is driven by the first driving voltage output by the first driving circuit and the second driving voltage output by the second driving circuit. At this time, the power conversion device (or the driving circuit) is in the fast driving mode (or referred to as "slow turn-on fast turn-off mode" or "fast turn-on slow turn-off mode") to meet the working requirement of "needing to increase the driving speed" of the power conversion device. Alternatively, when the power conversion device is in the second drive mode (or referred to as "first-level fast drive mode", "slow turn-on fast turn-off mode", or "fast turn-on slow turn-off mode"), the first mode control signal controls the second switching circuit to turn off, and the second mode control signal controls the fourth switching circuit to turn on. The power switching transistor is driven by the first drive voltage output from the first drive circuit and the third drive voltage output from the third drive circuit. At this time, the power conversion device (or drive circuit) is in a fast drive mode (or referred to as "slow turn-on fast turn-off mode" or "fast turn-on slow turn-off mode") to meet the operating requirement of "increasing drive speed" of the power conversion device. It is possible that when the second drive circuit fails to operate normally, the power conversion device can meet the operating requirement of "increasing drive speed" by activating the third drive circuit (understandably, the third drive circuit can also serve as a backup circuit for the second drive circuit).

[0010] In conjunction with the first aspect, in one possible implementation, when the power conversion device is in the third driving mode, the first mode control signal controls the second switching circuit to turn on, and the second control signal controls the fourth switching circuit to turn on. The power switching transistor is turned on or off based on the first driving voltage, the second driving voltage, and the third driving voltage. Specifically, the first switching circuit is turned on when the first driving voltage is at a first level, the second driving circuit outputs a second driving voltage to the power switching transistor when the first driving voltage is at a first level, and the second driving voltage is at the first level; the third switching circuit is turned on when the first driving voltage is at a first level, and the third driving circuit outputs a third driving voltage to the power switching transistor when the first driving voltage is at a first level, and the third driving voltage is at the first level. In this application, when the power conversion device is in the third driving mode (or referred to as "second-level fast driving mode", "slow-on ultra-fast-off mode" or "ultra-fast-on slow-off mode"), the first mode control signal controls the second switching circuit to turn on, and the second mode control signal controls the fourth switching circuit to turn on. The power switching transistor is driven by the first driving voltage output from the first driving circuit, the second driving voltage output from the second driving circuit, and the third driving voltage output from the third driving circuit. At this time, the power conversion device (or driving circuit) is in the ultra-fast driving mode (or referred to as "slow-on ultra-fast-off mode" or "ultra-fast-on slow-off mode") to meet the working requirement of the power conversion device to "significantly increase (or further increase) the driving speed".

[0011] In conjunction with the first aspect, in one possible implementation, the second driving circuit further includes an inverting circuit, a fifth switching circuit, and a sixth switching circuit. The inverting circuit is connected to the sixth switching circuit and receives and outputs the first mode control signal, after level inversion processing, to the sixth switching circuit to control its on / off state. The fifth switching circuit is connected to the first driving circuit and is used to turn on or off based on the first driving voltage output by the first driving circuit. The second driving circuit is also used to output a fourth driving voltage to the control electrode of the power switch transistor when both the fifth and sixth switching circuits are on, to turn the power switch transistor on or off. The fourth driving voltage has a different polarity than the second driving voltage. When the power conversion device is in the fourth driving mode, the first mode control signal controls the second switching circuit to turn on, and after level inversion processing, the first mode... The control signal controls the sixth switching circuit to turn off, and the power switching transistor is turned on or off based on the first driving voltage and the second driving voltage; wherein, the first switching circuit is turned on when the first driving voltage is at the first level, and the second driving circuit outputs the second driving voltage to the power switching transistor when the first driving voltage is at the first level, and the second driving voltage is at the first level; or, when the power conversion device is in the fourth driving mode, the first mode control signal controls the second switching circuit to turn off, and after level inversion processing, the first mode control signal controls the sixth switching circuit to turn on, and the power switching transistor is turned on or off based on the first driving voltage and the fourth driving voltage; wherein, the fifth switching circuit is turned on when the first driving voltage is at the second level, and the second driving circuit outputs the fourth driving voltage to the power switching transistor when the first driving voltage is at the second level, and the fourth driving voltage is at the second level. In this application, the second drive circuit of the power conversion device has two branches that can output drive voltages of different polarities. When the power conversion device is in the fourth drive mode, the first mode control signal controls the second switch circuit to turn on (the fourth switch circuit is also turned on at this time due to the presence of the inverter). If the second drive voltage is used to control the power switch to turn off, the fourth drive voltage can be used to control the power switch to turn on, thereby enabling the power switch to be turned off or turned on quickly.

[0012] In conjunction with the first aspect, in one possible implementation, the power conversion device includes multiple power switching transistors and drive circuit groups corresponding to each power switching transistor; wherein, the second drive circuits in each drive circuit group all receive the same first mode control signal. In this application, when multiple power switching transistors are configured in the power conversion device, the second drive circuits in the drive circuit groups corresponding to each power switching transistor all receive the same first mode control signal, or in other words, all the second drive circuits are connected to the second controller of the control unit, which helps to simplify the internal wiring structure of the power conversion device while ensuring drive performance and reducing the manufacturing cost of the power conversion device.

[0013] In conjunction with the first aspect, in one possible implementation, the power conversion device further includes a first controller; the first drive circuit includes a first driver and a first drive resistor; the first driver is connected to the first controller and the second drive circuit, and is used to receive the drive control signal output by the first controller and output a first drive voltage to the first drive resistor and the second drive circuit; one end of the first drive resistor is not connected to the first driver as the output terminal of the first drive circuit, and the output terminal of the first drive circuit is connected to the control electrode of the power switch transistor, and is used to output the first drive voltage to the power switch transistor. In this application, the first drive circuit outputs the first drive voltage to the second drive circuit through the first driver, which helps the first drive circuit (or the first driver) to control the second drive circuit and the first drive circuit to output high or low levels simultaneously in the fast drive mode, improves the working synchronization rate between the various drive circuits when the drive circuit switches from the "slow drive mode" to the "fast drive mode", and thus improves the drive performance of the drive circuit.

[0014] In conjunction with the first aspect, in one possible implementation, the power conversion device further includes a power supply circuit and a second controller; the power supply circuit, the second switching circuit, the first switching circuit, and the control electrode of the power switching transistor are connected in sequence; the first switching circuit includes a first switching transistor, the control electrode of which is connected to a first driving circuit for receiving a first driving voltage output by the first driving circuit and turning the first switching transistor on or off based on the first driving voltage; the second switching circuit includes a second switching transistor, the control electrode of which is connected to the second controller for receiving a first mode control signal sent by the second controller and turning the second switching transistor on or off; the second switching transistor is connected in series with the first switching transistor; when both the first and second switching transistors are on, the second driving circuit outputs a second driving voltage to the control electrode of the power switching transistor, the second driving voltage being provided by the power supply circuit. In this application, a power supply circuit, a second switching circuit, a first switching circuit, and the control electrode of a power switch are connected in sequence. The first driving circuit controls the first switch in the first switching circuit to turn on or off by outputting a first driving voltage. The second controller controls the second switch in the second switching circuit to turn on or off by outputting a first mode control signal. Furthermore, when both the first and second switches are on, the second driving circuit can output a second driving voltage provided by the power supply circuit and having the same polarity as the first driving voltage to the control electrode of the power switch, thereby achieving rapid on or rapid off of the power switch together with the first driving voltage.

[0015] In conjunction with the first aspect, in one possible implementation, the power conversion device further includes a power supply circuit and a third controller; the power supply circuit, the fourth switching circuit, the third switching circuit, and the control electrode of the power switching transistor are connected in sequence; the third switching circuit includes a third switching transistor, the control electrode of which is connected to the first driving circuit for receiving a first driving voltage output by the first driving circuit, and turning the third switching transistor on or off based on the first driving voltage; the fourth switching circuit includes a fourth switching transistor, the control electrode of which is connected to the third controller for receiving a second mode control signal sent by the third controller for turning the fourth switching transistor on or off; the fourth switching transistor is connected in series with the third switching transistor; when both the third and fourth switching transistors are on, the third driving circuit outputs a third driving voltage to the control electrode of the power switching transistor, the third driving voltage being provided by the power supply circuit. In this application, the power supply circuit, the fourth switch circuit, the third switch circuit, and the control electrode of the power switch are connected in sequence. The first drive circuit controls the third switch in the first switch circuit to turn on or off by outputting a first drive voltage. The third controller controls the second switch in the second switch circuit to turn on or off by outputting a second mode control signal. Furthermore, when both the third and fourth switch are on, the third drive circuit can output a third drive voltage provided by the power supply circuit and having the same polarity as the first drive voltage to the control electrode of the power switch, thereby achieving rapid on or rapid off of the power switch together with the first drive voltage.

[0016] In conjunction with the first aspect, in one possible implementation, the power conversion device further includes a power supply circuit and a second controller; the power supply circuit, the sixth switching circuit, the fifth switching circuit, and the control electrode of the power switching transistor are connected in sequence; an inverting circuit is connected to the second controller and the sixth switching circuit, used to receive a first mode control signal output by the second controller, and output the first mode control signal to the sixth switching circuit after level inversion processing; the fifth switching circuit includes a fifth switching transistor, the control electrode of the fifth switching transistor is connected to the first driving circuit, used to receive a first driving voltage output by the first driving circuit, and turn the fifth switching transistor on or off based on the first driving voltage; the sixth switching circuit includes a sixth switching transistor, the control electrode of the sixth switching transistor is connected to the inverting circuit, used to receive the first mode control signal output by the inverting circuit after level inversion processing, and turn the sixth switching transistor on or off based on the first mode control signal after level inversion processing; the sixth switching transistor is connected in series with the fifth switching transistor; when both the fifth and sixth switching transistors are on, the second driving circuit outputs a fourth driving voltage to the control electrode of the power switching transistor, the fourth driving voltage being provided by the power supply circuit. In this application, the power supply circuit, the sixth switch circuit, the fifth switch circuit, and the control electrode of the power switch are connected in sequence. The first drive circuit controls the fifth switch in the first switch circuit to turn on or off by outputting a first drive voltage. The first mode control signal output by the second controller is inverted by an inverter and output to the sixth switch in the sixth switch circuit to control the sixth switch to turn on or off. Furthermore, when the first switch, the second switch, the fifth switch, and the sixth switch are all on, the second drive circuit can output a second drive voltage (such as a second positive voltage and a second negative voltage) provided by the power supply circuit and having the same polarity as the first drive voltage to the control electrode of the power switch, thereby achieving rapid turn-on and rapid turn-off of the power switch together with the first drive voltage.

[0017] In conjunction with the first aspect, in one possible implementation, the first switching transistor and the second switching transistor have the same bias polarity; the second driving circuit further includes a second driving resistor, with the first terminal of the first switching transistor connected to the second driving resistor, and the second terminal of the first switching transistor connected to the first terminal of the second switching transistor; the second terminal of the second switching transistor is connected to the power supply circuit for receiving the first power supply voltage provided by the power supply circuit; the end of the second driving resistor not connected to the first switching transistor serves as the first output terminal of the second driving circuit, and the first output terminal is connected to the control terminal of the power switching transistor for outputting the first power supply voltage to the control terminal of the power switching transistor when both the first and second switching transistors are turned on.

[0018] In conjunction with the first aspect, in one possible implementation, the second driving circuit further includes a second driver. One end of the second driver is connected to the control electrode of the second switching transistor, and the other end is connected to a second controller. The second driver receives and amplifies the first mode control signal output by the second controller, and outputs the amplified first mode control signal to the second switching transistor to turn it on or off. In this application, the second driving circuit may also include a second driver, which can be used to amplify the first mode control signal, thereby improving the driving capability of the second driving circuit. Furthermore, it can achieve electrical isolation between the first mode control signal and the second driving circuit, thus ensuring the safe operation of the power conversion device 100 and improving the overall anti-interference capability of the device.

[0019] In conjunction with the first aspect, in one possible implementation, the third and fourth switching transistors have the same bias polarity, and the same bias polarity as the first switching transistor. The third driving circuit further includes a third driving resistor, with the first terminal of the third switching transistor connected to the third driving resistor; the second terminal of the third switching transistor is connected to the first terminal of the fourth switching transistor; the second terminal of the fourth switching transistor is connected to a power supply circuit to receive a second power supply voltage provided by the power supply circuit, the second power supply voltage having the same polarity as the first power supply voltage; the end of the third driving resistor not connected to the fourth switching transistor serves as the output terminal of the third driving circuit, and the output terminal of the third driving circuit is connected to the control terminal of the power switching transistor, used to output the second power supply voltage to the control terminal of the power switching transistor when both the third and fourth switching transistors are turned on. In this application, by configuring the third and fourth switching transistors as switching transistors with the same bias polarity as the first switching transistor, multi-stage fast driving of the power switching transistors can be achieved in conjunction with the second driving circuit. For example, assuming the power switch is in a high-level conduction state, when the first and third switches are in a low-level conduction state, the second switch is in conduction based on a first-mode control signal, and the fourth switch is in conduction based on a second-mode control signal, only the second driving circuit and the first driving circuit simultaneously output a low level to the control electrode of the power switch, thereby achieving the effect of quickly turning off the power switch. When the first and third switches are in a low-level conduction state, the second switch is in conduction based on a first-mode control signal, and the fourth switch is in conduction based on a second-mode control signal, the second driving circuit and the third driving circuit can simultaneously output a low level to the control electrode of the power switch with the first driving circuit, thereby achieving the effect of ultra-fast power switch turn-off. Compared to the scenario where "only the first and second driving circuits output a low level to the power switch," this scenario has a more powerful driving capability.

[0020] In conjunction with the first aspect, in one possible implementation, the fifth and sixth switching transistors have the same bias polarity, but a different bias polarity than the first switching transistor. The second driving circuit further includes a fourth driving resistor, with the first terminal of the fifth switching transistor connected to the fourth driving resistor and the second terminal of the fifth switching transistor connected to the first terminal of the sixth switching transistor. The second terminal of the sixth switching transistor is connected to the power supply circuit to receive a third power supply voltage provided by the power supply circuit, the third power supply voltage having a different polarity than the first power supply voltage. The end of the fourth driving resistor not connected to the fifth switching transistor serves as the second output terminal of the second driving circuit, and the second output terminal is connected to the control terminal of the power switching transistor to output the third power supply voltage to the control terminal of the power switching transistor when both the fifth and sixth switching transistors are turned on. In this application, by configuring the fifth and sixth switching transistors as switching transistors with a bias polarity different from that of the first switching transistor, it is possible to control the second and sixth switching transistors to turn on or off using the same first mode control signal, reducing the complexity of the internal wiring of the power conversion device and reducing the manufacturing cost of the power conversion device. Furthermore, by configuring a fifth and a sixth switch in the second driving circuit, the second driving circuit can synchronously output high and low levels with the first driving circuit, thereby enabling rapid turn-on and rapid turn-off of the power switch. Understandably, if the second driving circuit only contains the first and second switches, it can only achieve rapid turn-on or rapid turn-off of the power switch in conjunction with the first driving circuit. However, if an inverter, a fifth switch, and a sixth switch are added to the second driving circuit based on the first and second switches, the second driving circuit can then combine with the first driving circuit to achieve rapid turn-on and rapid turn-off of the power switch, possessing a more comprehensive rapid driving capability.

[0021] In conjunction with the first aspect, in one possible implementation, the end of the first driver connected to the first driving resistor is connected to at least one of the control terminals of the first switching transistor, the third switching transistor, and the fifth switching transistor. In this application, the first driver, by outputting a first driving voltage to the first driving resistor, facilitates the output of a first driving voltage to the power switching transistor through the first driving resistor, thereby controlling the power switching transistor to turn on or off. Furthermore, by outputting the first driving voltage to at least one of the control terminals of the first, third, and fifth switching transistors, the first driver facilitates the control of the first, third, or fifth switching transistor to turn on or off, thereby facilitating subsequent control of the second driving circuit and the first driving circuit to simultaneously output a high or low level, achieving a fast driving effect. For example, assuming the power switch is in a high-level conduction state, when the first switch is in a low-level conduction state and the second switch is in conduction state based on the first mode control signal, the second driving circuit can simultaneously output a low level to the control electrode of the power switch with the first driving circuit, thereby successfully achieving the effect of quickly turning off the power switch; when the first switch is in a high-level conduction state and the second switch is in conduction state based on the first mode control signal, the second driving circuit can simultaneously output a high level to the control electrode of the power switch with the first driving circuit, thereby successfully achieving the effect of quickly turning on the power switch.

[0022] In conjunction with the first aspect, in one possible implementation, the first driving circuit further includes a push-pull circuit connected to the first driver and the first driving resistor. This push-pull circuit amplifies the first driving voltage output by the first driver and outputs the amplified first driving voltage to the first driving resistor. The push-pull circuit may include a seventh switch and an eighth switch, with the seventh and eighth switches having different bias polarities. The control terminal of the seventh switch is connected to the control terminal of the eighth switch and then to the first driver to receive the first driving voltage output by the first driver. The first terminal of the seventh switch is connected to the first terminal of the eighth switch and then to the first driving resistor to output the amplified first driving voltage to the first driving resistor. In this application, the first driving circuit includes a "push-pull amplifier circuit composed of a seventh switch and an eighth switch with different bias polarities," which amplifies the first driving voltage output by the first driver, improves the driving capability of the first driving circuit, and outputs the amplified first driving voltage to the control terminal of the power switch via the first driving resistor to control the power switch to turn on or off.

[0023] In conjunction with the first aspect, in one possible implementation, the power switch is turned off based on a low level; a first switching circuit is turned on based on a first driving voltage being low, and a second switching circuit is turned on upon receiving a first mode control signal being low; the second driving circuit outputs a low level to the power switch when both the first and second switching circuits are on. In this application, if the power switch is an N-channel metal-oxide-semiconductor (MOS) transistor, and the power switch is turned off based on a low level, then the first level is low. In this case, a switching transistor such as a PNP transistor that is turned on based on a low level can be used to construct the first and second switching circuits, so that when both the first and second switching circuits are on, the second driving circuit can output a low level to the power switch, thereby improving the turn-off speed of the power switch.

[0024] In conjunction with the first aspect, in one possible implementation, the power switch is turned on based on a high level; a first switching circuit is turned on based on a first driving voltage being high, and a second switching circuit is turned on based on a first mode control signal being high; the second driving circuit outputs a high level to the power switch when both the first and second switching circuits are turned on. In this application, if the power switch is an N-channel metal-oxide-semiconductor, and the power switch is turned on based on a high level, then the first level is high; in this case, a switching transistor such as an NPN transistor that is turned on based on a high level can be used to construct the first and second switching circuits, so that when both the first and second switching circuits are turned on, the second driving circuit can output a high level to the power switch, thereby improving the turn-on speed of the power switch.

[0025] Secondly, this application provides a switching circuit comprising a target switch, a first driving circuit, and a second driving circuit. The first driving circuit is connected to the target switch and the second driving circuit, and is used to receive a driving control signal and output a first driving voltage to the target switch and the second driving circuit. The second driving circuit includes a first switching circuit and a second switching circuit connected in series. The first switching circuit is connected to the first driving circuit and is used to turn on or off based on the first driving voltage. The second switching circuit is connected to a control unit and is used to receive a first mode control signal and turn on or off. The second driving circuit is connected to the control electrode of a power switch transistor, and when both the first and second switching circuits are on, the second driving circuit outputs a second driving voltage to the control electrode of the target switch. Both the first driving voltage and the second driving voltage are used to turn the target switch on or off. The beneficial effects achieved by the switching circuit shown in the second aspect can be found in the description of the corresponding beneficial effects of the driving circuit in the first aspect, and will not be repeated here. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the architecture of a power conversion device provided in an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the architecture of a power conversion device with configurable turn-off speed provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of another power conversion device provided in an embodiment of this application;

[0029] Figure 4 is a schematic diagram of the composition of a driving circuit provided in an embodiment of this application;

[0030] Figure 5 is a schematic diagram of another driving circuit provided in an embodiment of this application;

[0031] Figure 6 is a schematic diagram of another driving circuit provided in an embodiment of this application;

[0032] Figure 7 is a schematic diagram of another driving circuit provided in an embodiment of this application;

[0033] Figure 8 is a schematic diagram of another driving circuit provided in an embodiment of this application;

[0034] Figure 9 is a schematic diagram of another driving circuit provided in an embodiment of this application;

[0035] Figure 10 is a coupling schematic diagram of a multi-channel drive circuit group provided in an embodiment of this application. Detailed Implementation

[0036] Please refer to Figure 1, which is a schematic diagram of the architecture of a power conversion device provided in an embodiment of this application. The power conversion device 100 may include a power supply circuit 101, a control unit 102, a drive circuit 103, and a power conversion circuit 104. The power conversion circuit 104 is the core physical channel for power conversion in the power conversion device 100, and its key components are power switching devices (such as metal-oxide-semiconductor field-effect transistors, insulated-gate bipolar transistors, etc.). The power conversion circuit 104 (which may include multiple power switching devices) connects to an external power supply, the drive circuit 103, and the load. It is used to repeatedly turn the power switching devices on and off at extremely high frequencies based on the drive circuit 103, thereby rectifying, inverting, chopping, AC voltage regulating, or frequency converting the power supplied by the external power supply, and then providing the processed power to the load to meet the load's operating requirements. For example, when the power supplied by the external power source is DC, the power conversion circuit 104 can convert the DC power from the external power source into AC power; when the power supplied by the external power source is AC, the power conversion circuit 104 can convert the AC power from the external power source into DC power.

[0037] Specifically, in the power conversion device, the power supply circuit 101 can perform transformation and rectification operations on the electrical energy from the external power source, thereby providing stable and isolated low-voltage DC power to the control unit 102 and the drive circuit 103. For example, the input terminal of the power supply circuit 101 can be connected to a high-voltage DC bus (or a low-voltage DC bus, AC bus, etc.; this application does not limit the voltage and power transmission form of the external power source), converting the DC power (e.g., 1500 volts) on the high-voltage DC bus into low-voltage DC power (e.g., 15 volts), and outputting the processed electrical energy to the control unit 102 and the drive circuit 103 to meet the operational requirements of the control unit 102 and the drive circuit 103.

[0038] The control unit 102 can continuously sample the system status (such as input / output voltage and current), generate corresponding control signals (such as pulse width modulation signals, state switching signals, etc.) according to the internal algorithm, and send the control signals to the drive circuit 103 to achieve precise voltage regulation, constant current or frequency conversion control.

[0039] The drive circuit 103 is connected to the power conversion circuit 104 and is used to amplify the control signal sent by the control unit 102 to a level sufficient to drive the power switching devices in the power conversion circuit 104 quickly and reliably, so as to realize the control of the power conversion circuit 104 to perform rectification, inversion, chopping, AC voltage regulation or frequency conversion on the power supplied by the external power source.

[0040] Through the coordinated operation of the aforementioned units or circuits, the power conversion device 100 can achieve precise control of parameters such as voltage, current, frequency, and phase of electrical energy, meeting the usage requirements of different loads or power grids. It should be noted that the power conversion devices provided in this application embodiment include, but are not limited to, inverters, rectifiers, bidirectional DC-DC converters, grid-connected / off-grid converters, industrial frequency converters, electronic device chargers, etc. It should be understood that any device capable of performing power conversion operations on external power supplies can be considered as the power conversion device described in this application embodiment.

[0041] In practical applications such as charging and discharging of new energy vehicles, charging and discharging of energy storage systems, and industrial motor drives, power conversion devices often need to cope with diverse operating conditions. For example, when fast charging of new energy vehicles or high-power grid connection of energy storage systems, power conversion devices need to operate under high-power output conditions. In this case, it is necessary to prioritize reducing the switching losses of power switching devices to improve power conversion efficiency. However, in scenarios such as idling charging of new energy vehicles, low-power maintenance of energy storage systems, and power supply of precision equipment sensitive to electromagnetic interference, power conversion devices need to operate under low-power conditions. In this case, it is necessary to prioritize reducing the electromagnetic interference generated by power switching devices during the switching process to ensure the stable operation of the system and surrounding equipment. To adapt to different operating conditions, this application provides a drive circuit architecture capable of flexibly switching drive speeds. Please refer to Figures 1 and 2. Figure 2 is a schematic diagram of the architecture of a power conversion device with configurable turn-off speed provided in this application. As shown in Figure 2, the first power conversion device 200 includes a second power supply circuit 201, a second control unit 202, a fourth drive circuit 203, and a second power switch 204. The second control unit 202 includes a fourth controller 2021 and a fifth controller 2022. The fourth drive circuit 203 includes drive circuits A and B connected in parallel. For ease of description, this application will use the example of "the second power switch 204 being an N-type metal-oxide-semiconductor (NMOS transistor)" for description.

[0042] As shown in Figure 2, the drive circuit A is connected to the gate of the fourth controller 2021, the second power supply circuit 201, and the second power switch 204. It receives the pulse width modulation (PWM) signal sent by the fourth controller 2021 and outputs a fifth drive voltage U5 to the gate of the second power switch 204 based on the PWM signal. This controls the second power switch 204 to turn on or off, enabling it to perform power conversion processing such as inversion on the power supplied by the external power source. The fifth drive voltage U5 can be either the second positive voltage VCC2 or the second negative voltage VEE2 output by the second power supply circuit 201. Specifically, the drive circuit A may include a first optocoupler 205 connected in series, a first push-pull circuit (composed of a first transistor T1 and a second transistor T2), and a first resistor R. a The first optocoupler 205 is connected to the second power supply circuit 201 and is used to receive the second positive voltage VCC2 and the second negative voltage VEE2 provided by the second power supply circuit 201. The first optocoupler 205 is also connected to the fourth controller 2021 and is used to receive the PWM signal sent by the fourth controller 2021 and output the second positive voltage or the second negative voltage to the first push-pull circuit to control the first push-pull circuit to output the second positive voltage or the second negative voltage to the second resistor R. bThe fifth driving voltage U5 is output. For example, when the PWM signal is high, the first optocoupler 205 outputs a second positive voltage to the first push-pull circuit; when the PWM signal is low, the first optocoupler 205 outputs a second negative voltage to the first push-pull circuit.

[0043] The first push-pull circuit is connected to the first resistor R. a It is used to receive the second positive voltage or the second negative voltage output from the first optocoupler 205, amplify the second positive voltage or the second negative voltage, and output it to the first resistor R. a In the first push-pull circuit, the base of the first transistor T1 is connected to the base of the second transistor T2, serving as the input terminal of the first push-pull circuit to receive the second positive or second negative voltage output by the first optocoupler 205. The emitter of the first transistor T1 is connected to the emitter of the second transistor T2, serving as the output terminal of the first push-pull circuit to output the fifth driving voltage U5 to the first driving resistor. Further, the collector of the first transistor T1 is connected to the second power supply circuit 201 to receive the second positive voltage output by the second power supply circuit 201; the collector of the second transistor T2 is connected to the second power supply circuit 201 to receive the second negative voltage output by the second power supply circuit 201. For example, if the first optocoupler 205 outputs the second positive voltage to the first push-pull circuit, the first transistor T1 is turned on, and the first transistor T1 outputs the second positive voltage to the first resistor R. a The output is a second positive voltage (or, at this time, the fifth driving voltage U5 is the second positive voltage); if the first optocoupler 205 outputs a second negative voltage to the first push-pull circuit, the second transistor T2 is turned on, and the second transistor T2 outputs a voltage to the first resistor R. a Output the second negative voltage (or, at this time, the fifth driving voltage U5 is the second negative voltage).

[0044] Correspondingly, the drive circuit B is connected to the gate of the fourth controller 2021, the fifth controller 2022, the second power supply circuit 201, and the second power switch 204. It receives the PWM signal from the fourth controller 2021 and the level control (CTL) signal from the fifth controller 2022, and outputs a sixth drive voltage U6 (which can be a second positive voltage or a second negative voltage output from the second power supply circuit 201) to the gate of the second power switch 204. This controls the second power switch 204 to turn on or off, enabling it to perform power conversion processing, such as inversion, on the power supplied by the external power source. The CTL signal can be used to control the operation of the drive circuit B. For example, when the CTL signal is high, the drive circuit B does not operate; when the CTL signal is low, the drive circuit B outputs the sixth drive voltage U6 based on the PWM signal. Specifically, the drive circuit B includes a buffer 207 (such as a digital buffer or a switching element). For example, the buffer 207 is turned on when the CTL signal is low, thereby allowing the PWM signal to be input to the drive circuit B; the buffer 207 is turned off when the CTL signal is high, thereby blocking the input of the PWM signal.

[0045] Specifically, the driving circuit B may include a buffer 207 connected in series, a second optocoupler 208, a second push-pull circuit (composed of a third transistor T3 and a fourth transistor T4), and a second resistor R. b and diode D b The buffer 207 is also connected to the fourth controller 2021 and the fifth controller 2022. It receives the CTL signal sent by the fifth controller 2022 and turns on or off accordingly. When on based on the CTL signal, it transmits the PWM signal sent by the fourth controller 2021 to the second optocoupler 208. For example, if the fifth controller 2022 outputs a high level to the buffer 207, the buffer 207 is turned off. In this case, the PWM signal output by the fourth controller cannot be transmitted to the second optocoupler 208, which can be understood as the drive current B being turned off. If the fifth controller 2022 outputs a low level to the buffer 207, the buffer 207 is turned on. In this case, the PWM signal output by the fourth controller is transmitted to the second optocoupler 208, which can be understood as the drive current B being able to output the sixth drive voltage U6 to the second power switch 204 based on the PWM signal.

[0046] The second optocoupler 208 is connected to the second power supply circuit 201 and is used to receive the second positive voltage and the second negative voltage provided by the second power supply circuit 201. The second optocoupler 208 can also output a second positive voltage or a second negative voltage to the second push-pull circuit based on the PWM signal transmitted from the buffer 207, thereby controlling the second push-pull circuit to supply power to the second resistor R. bThe sixth driving voltage U6 is output. For example, when the PWM signal is high, the second optocoupler 208 outputs a second positive voltage to the second push-pull circuit; when the PWM signal is low, the second optocoupler 208 outputs a second negative voltage to the second push-pull circuit.

[0047] The second push-pull circuit is connected to the second resistor R. b It is used to receive the second positive voltage or the second negative voltage output from the second optocoupler 208, amplify the second positive voltage or the second negative voltage, and output it to the second resistor R. b In the second push-pull circuit, the base of the third transistor T3 is connected to the base of the fourth transistor T4, serving as the input terminal of the second push-pull circuit to receive the second positive or second negative voltage output by the second optocoupler 208. The emitter of the third transistor T3 is connected to the emitter of the fourth transistor T4, serving as the output terminal of the second push-pull circuit to output the sixth driving voltage U6 to the first driving resistor. Further, the collector of the third transistor T3 is connected to the second power supply circuit 201 to receive the second positive voltage output by the second power supply circuit 201; the collector of the fourth transistor T4 is connected to the second power supply circuit 201 to receive the second negative voltage output by the second power supply circuit 201. For example, if the second optocoupler 208 outputs the second positive voltage to the second push-pull circuit, the third transistor T3 is turned on, and the third transistor T3 outputs the second negative voltage to the second resistor R. b The output is a second positive voltage (or, at this time, the sixth driving voltage U6 is the second positive voltage); if the second optocoupler 208 outputs a second negative voltage to the second push-pull circuit, the fourth transistor T4 is turned on, and the fourth transistor T4 outputs a voltage to the second resistor R. b Output the second negative voltage (or, at this time, the sixth driving voltage U6 is the second negative voltage).

[0048] Second resistor R b Connect diode D b The negative terminal of diode D b The positive terminal is connected to the gate of the second power switch 204, and is used to transmit the sixth driving voltage U6 to the gate of the second power switch 204 (or, to transmit the second negative voltage to the gate of the second power switch 204).

[0049] The aforementioned driving structure enables the first power conversion device 200 to have two driving modes: slow turn-on and slow turn-off, and slow turn-on and fast turn-off, to meet the operating requirements of the second power switch 204 under different operating conditions. For example, when the first power conversion device 200 is in the "slow turn-on and slow turn-off" driving mode, the fifth controller 2022 outputs a high-level CTL signal to the driving circuit B to control the driving circuit B to stop working. At this time, the second power switch 204 is driven only by the fifth driving voltage U5 output by the driving circuit A. When the first power conversion device 200 is in the "slow turn-on and fast turn-off" driving mode, the fifth controller 2022 outputs a low-level CTL signal to the driving circuit B to control the driving circuit B to work based on the PWM signal output by the fourth controller 2021. At this time, the second power switch 204 is driven only by the fifth driving voltage U5 (including the second positive voltage and the second negative voltage) output by the driving circuit A and the sixth driving voltage U6 (including the second negative voltage) output by the driving circuit B. Among them, the resistance value of the driving resistor corresponding to the "slow conduction and fast turn-off" driving mode is the first resistor R. a With the second resistor R b The parallel resistance value, compared to the corresponding drive resistor (i.e., the first resistor R) in the "slow turn-on, slow turn-off" drive mode. a The resistance is smaller, so the "slow turn-on, fast turn-off" drive mode has a faster turn-off speed.

[0050] As can be seen, the first power conversion device 200 shown in Figure 2 achieves flexible control over the turn-off speed of the power switching transistors through the selective operation of the second drive circuit. This allows the first power conversion device 200 to reasonably adjust the drive speed according to different operating conditions, achieving a balance between the switching losses and electromagnetic interference of the power switching devices. However, it should be noted that the parallel structure of the drive circuits shown in Figure 2 has an inherent defect: since the paths of the control signal (which can be understood as a PWM signal) to the two parallel drive circuits cannot be completely identical, there will be a difference in transmission delay. This results in drive circuits A and B not being able to achieve precise synchronous conduction when switching from "slow turn-on slow turn-off mode" to "slow turn-on fast turn-off mode," but instead conducting sequentially one after the other. This asynchronous conduction process not only slows down the overall driving capability enhancement process of the drive circuit and reduces the switching efficiency, but may also cause the switching transistors in the power conversion circuit to generate non-ideal switching waveforms at the moment of switching, greatly reducing the expected "fast turn-off" effect and failing to fully utilize the performance advantages of the parallel structure. Therefore, how to improve the switching performance of the drive circuit and achieve fast, smooth, and synchronous switching of the drive mode is a problem that urgently needs to be solved by those skilled in the art.

[0051] To address this, this application provides a power conversion device, which includes a power switch transistor and a corresponding drive circuit group for the power switch transistor. The drive circuit group may include a first drive circuit and a second drive circuit. The second drive circuit switches between on and off states under the joint control of the control unit and the first drive circuit. Exemplarily, the second drive circuit includes a first switch circuit and a second switch circuit. The first switch circuit is connected to the first drive circuit and is used to turn on or off based on a first drive voltage output by the first drive circuit; the second switch circuit is connected to the control unit and is used to turn on or off based on a first mode control signal. When the driving circuit is in a "slow driving mode" (e.g., slow turn-on and slow turn-off mode), the first mode control signal can control the second switching circuit to turn off (then the second driving circuit is in the off state), and the power switch is driven by the first driving voltage output by the first driving circuit. When the driving circuit is in a "fast driving mode" (e.g., slow turn-on and fast turn-off mode, slow turn-off and fast turn-on mode, fast turn-on and fast turn-off mode), the first mode control signal can control the second switching circuit to turn on. The first switching circuit turns on or off based on the first driving voltage output by the first driving circuit, so that the power switch is driven by the first driving voltage output by the first driving circuit and the second driving voltage output by the second driving circuit, thereby achieving a fast driving effect. For example, when the driving circuit of this embodiment is in a "slow turn-on and fast turn-off mode", if the first driving voltage is high, the first switching circuit is off; if the first driving voltage is low, the first switching circuit is on. At this time, the second driving circuit can output a low level to the power switch, thereby increasing the turn-off speed of the power switch and achieving the effect of slow turn-on and fast turn-off. It can be seen that when the driving circuit of this application embodiment is in "fast driving mode", the second driving voltage output by the second driving circuit can be synchronously output with the first driving voltage output by the first driving circuit at a high level and / or a low level, thereby improving the working synchronization rate between the driving circuits (or power conversion device) when switching different driving modes, and thus improving the driving performance of the driving circuit.

[0052] Next, this application will describe the specific structure of the power conversion device with reference to Figures 1 and 3-10. Please refer to Figure 3, which is a schematic diagram of another power conversion device provided by an embodiment of this application based on the power conversion device shown in Figure 1. As shown in Figure 3, the power conversion device 100 may include a power supply circuit 101, a control unit 102, a drive circuit group, and a power conversion circuit 104. The drive circuit group includes a first drive circuit 1031 and a second drive circuit 1032. The power conversion circuit 104 may include at least one power switch 106. It should be noted that the embodiments of this application do not limit the specific location and function of the power switch 106 in the power conversion circuit 104. It can be understood that all power switches configured in the power conversion circuit 104 can be driven by the drive circuit 103.

[0053] As shown in Figure 3, the control unit 102 includes a first controller C1 and a second controller C2. The first controller C1 is connected to the first drive circuit 1031 and can provide a drive control signal to the first drive circuit 1031 to control the first drive circuit 1031 to output a first drive voltage. The second controller C2 is connected to the second drive circuit 1032 and can output a first mode control signal to the second drive circuit 1032 to control whether the second drive circuit 1032 synchronously outputs a drive voltage of the same polarity as the first drive circuit 1031. For example, the drive control signal can be a PWM signal, and the first mode control signal can be a CTL signal.

[0054] The first drive circuit 1031 is connected to the power supply circuit 101, the second drive circuit 1032, and the control electrode of the power switch 106. It receives the drive control signal sent by the first controller C1 and outputs a first drive voltage to the control electrode of the second drive circuit 1032 or the power switch 106. Specifically, the first drive circuit 1031 includes a first driver D1 and a first drive resistor R1 connected in series. The first driver D1 is connected to the first controller C1 and the power supply circuit 101. It receives the first positive voltage VCC and the first negative voltage VEE output by the power supply circuit 101, receives the drive control voltage output by the first controller C1, and outputs the first positive voltage or the first negative voltage provided by the power supply circuit 101 to the first drive resistor R1 and the second drive circuit 1032 based on the drive control voltage. For example, when the drive control signal is at a first level (e.g., low level), the first driver D1 outputs a first negative voltage to the first drive resistor R1; when the drive control signal is at a second level (e.g., high level), the first driver D1 outputs a first positive voltage to the first drive resistor R1. The first driving resistor R1 can transmit the first positive voltage or the first negative voltage output by the first driver D1 to the power switch 106. Understandably, the first driving voltage at this time is the first positive voltage or the first negative voltage output by the first driver D1.

[0055] The second drive circuit 1032 is connected to the power supply circuit 101 and the control electrode of the power switch 106. It outputs a second drive voltage to the power switch 106 based on the first mode control signal output by the second controller C2 and the first drive voltage output by the first drive circuit 1031 (or first driver D1). The second drive voltage is provided by the power supply circuit 101. Specifically, the second drive circuit 1032 includes a first switch circuit 301 and a second switch circuit 302. The first switch circuit 301 is connected to the connection point between the first driver D1 and the first drive resistor R1 (or, the output terminal of the first drive voltage output by the first driver D1), and is used to receive the first drive voltage and turn on or off. The second switch circuit 302 is connected to the second controller C2 and is used to receive the first mode control signal and turn on or off. The power supply circuit 101, the second switch circuit 302, and the first switch circuit 301 are connected sequentially, so that the second drive circuit 1032 can output the second drive voltage to the control electrode of the power switch 106 when both the first switch circuit 301 and the second switch circuit 302 are on.

[0056] For example, as shown in FIG3, the first switching circuit 301 can be constructed by a first switching transistor Q1, and the second switching circuit 302 can be constructed by a second switching transistor Q2, wherein the first switching transistor Q1 and the second switching transistor Q2 have the same bias polarity. The control terminal of the first switching transistor Q1 is connected to the first driving circuit, and is used to receive the first driving voltage output by the first driving circuit 1031 (or the first driver D1) to turn the first switching transistor Q1 on or off; the control terminal of the second switching transistor Q2 is connected to the second controller C2, and is used to receive the first mode control signal sent by the second controller C2 to turn the second switching transistor Q2 on or off.

[0057] As shown in Figure 3, the second driving circuit 1032 may further include a second driving resistor R2. The first terminal of the first switching transistor Q1 is connected to the second driving resistor R2, and the second terminal of the first switching transistor Q1 is connected to the first terminal of the second switching transistor Q2. The second terminal of the second switching transistor Q2 is connected to the power supply circuit 101 to receive the first power supply voltage provided by the power supply circuit 101. The end of the second driving resistor R2 that is not connected to the first switching transistor Q1 serves as the first output terminal of the second driving circuit 1032. The first output terminal is connected to the control terminal of the power switching transistor 106 to output the first power supply voltage to the control terminal of the power switching transistor 106 when both the first switching transistor Q1 and the second switching transistor Q2 are turned on.

[0058] For example, if the power switch 106 is turned off based on a low-level drive voltage at its input control electrode, in order to improve the turn-off speed of the power switch 106, the first switch Q1 and the second switch Q2 can be configured as switches that are turned on when the drive voltage at their input control electrode is low (at this time, low level is the first level). Furthermore, the power supply circuit 101 provides a low-level first supply voltage to the second electrode of the second switch Q2. This ensures that when both the first switch Q1 and the second switch Q2 are turned on, the second drive circuit 1032 can synchronously output a low-level drive voltage to the power switch 106 with the first drive circuit 1031, thereby accelerating the turn-off of the power switch 106. Correspondingly, if the power switch 106 is turned on based on the high level of the drive voltage of the input control electrode, in order to improve the turn-on speed of the power switch 106, the first switch Q1 and the second switch Q2 can be set as switches that are turned on based on the high level of the drive voltage of the input control electrode (at this time, the high level is the first level). The power supply circuit 101 provides a first power supply voltage of high level to the second electrode of the second switch Q2, so that when both the first switch Q1 and the second switch Q2 are turned on, the second drive circuit 1032 can output a high level drive voltage to the power switch 106 synchronously with the first drive circuit 1031, thereby speeding up the turn-on of the power switch 106. For example, referring to Figures 3-5, if the power switch 106 is an NMOS transistor, and the power conversion device 100 is to be able to quickly turn off the power switch 106 in fast drive mode, the drive circuit structure shown in Figure 4 can be used; if the power conversion device 100 is to be able to quickly turn on the power switch 106 in fast drive mode, the drive circuit structure shown in Figure 5 can be used.

[0059] Figure 4 is a schematic diagram of a driving circuit provided in an embodiment of this application. As shown in Figure 4, the second terminal of the second switch Q2 is connected to the power supply circuit 101 and is used to receive the first negative voltage provided by the power supply circuit 101. This allows the second driving circuit 1032 to output the first negative voltage to the control terminal of the power switch 106 when both the first switch Q1 and the second switch Q2 are turned on, thereby controlling the power switch 106 to turn off quickly in combination with the first driving voltage. Furthermore, in order to ensure that the first negative voltage output by the power supply circuit 101 can be smoothly transmitted to the power switch 106, the first switch Q1 and the second switch Q2 can be configured as PNP transistors. For example, if the second controller C2 outputs a low-level first mode control signal to the second switch Q2, the second switch Q2 is turned on; if the first drive voltage output by the first driver D1 is low, the first switch Q1 is turned on. Then the second drive circuit 1032 can output the first negative voltage output by the power supply circuit 101 to the control electrode of the power switch 106. At this time, the control electrode of the power switch 106 simultaneously receives the "low-level first mode control signal" and the "first negative voltage", thereby enabling the power switch 106 to be turned off quickly.

[0060] Correspondingly, Figure 5 is a schematic diagram of another driving circuit provided in the embodiment of this application. As shown in Figure 5, the second terminal of the second switch Q2 is connected to the power supply circuit 101 and is used to receive the first positive voltage provided by the power supply circuit 101. This allows the second driving circuit 1032 to output the first positive voltage to the control terminal of the power switch 106 when both the first switch Q1 and the second switch Q2 are turned on, thereby combining the first driving voltage to control the power switch 106 to turn on quickly. Furthermore, in order to ensure that the first positive voltage output by the power supply circuit 101 can be smoothly transmitted to the power switch 106, the first switch Q1 and the second switch Q2 can be configured as NPN transistors. For example, if the second controller C2 outputs a high-level first mode control signal to the second switch Q2, the second switch Q2 will be turned on; if the first drive voltage output by the first driver D1 is high-level, the first switch Q1 will be turned on. Then the second drive circuit 1032 can output the first positive voltage output by the power supply circuit 101 to the control electrode of the power switch 106. At this time, the control electrode of the power switch 106 simultaneously receives the "high-level first mode control signal" and the "first positive voltage", thereby enabling the power switch 106 to be turned on quickly.

[0061] It should be noted that the above examples of the first switch Q1 / second switch Q2 being PNP or NPN transistors are merely possible implementations of the "fast turn-off" / "fast turn-on" mode in the scenario where "power switch 106 is an NMOS transistor," and should not be construed as limiting this application. For example, the first switch Q1 / second switch Q2 can also be a PMOS or NMOS transistor. It is understood that those skilled in the art can reasonably configure the specific types of the first switch Q1 and second switch Q2 based on the specific transistor type of power switch 106 and the fast drive requirements (such as fast turn-off of power switch 106 or fast turn-on of power switch 106). This application does not limit the specific form of the first switch Q1 / second switch Q2.

[0062] Optionally, if the first driving voltage output by the first driver D1 cannot drive the power switch 106 normally (or, the driving capability of the first driver D1 is weak and cannot meet the driving requirements of the power switch 106), or in order to further improve the driving capability of the driving circuit, a push-pull circuit can be set in the first driving circuit 1031 to amplify the first driving voltage output by the first driver D1, thereby enhancing the driving capability of the first driving circuit 1031. Specifically, please refer to Figures 3 and 6. Figure 6 is a schematic diagram of another driving circuit provided in an embodiment of this application. As shown in Figure 6, in addition to the first driver D1 and the first driving resistor R1, the first driving circuit 1031 is also equipped with a push-pull circuit 600 composed of a seventh switch Q7 and an eighth switch Q8. The control terminal of the seventh switch Q7 is connected to the control terminal of the eighth switch Q8 and connected to the first driver D1 to receive the first driving voltage output by the first driver D1. The first terminal of the seventh switch Q7 is connected to the first terminal of the eighth switch Q8 and connected to the first driving resistor R1 to output the amplified first driving voltage to the first driving resistor R1, thereby improving the driving capability of the driving circuit. The specific structure of the first switch Q1 and the second switch Q2 in Figure 6 and their connection relationship can be referred to the specific structure of the first switch Q1 and the second switch Q2 and their connection method shown in Figures 4 or 5, which will not be described in detail here.

[0063] Optionally, to ensure the safe operation of the power conversion device 100 and improve the overall anti-interference capability of the device, a second driver D2 can be provided in the second drive circuit 1032 to achieve electrical isolation between the first mode control signal and the second drive circuit. Specifically, please refer to Figures 3 and 7. Figure 7 is a schematic diagram of another drive circuit provided in the embodiment of this application. As shown in Figure 7, the second drive circuit 1032 includes a second driver D2, a first switch Q1, a second switch Q2, and a second drive resistor R2. One end of the second driver D2 is connected to the control electrode of the second switch Q2, and the other end of the second driver D2 is connected to the second controller C2. The second driver D2 is used to receive and amplify the first mode control signal output by the second controller C2, and output the amplified first mode control signal to the second switch Q2 to turn on or off the second switch Q2. Specifically, the second driver D2 is also connected to the power supply circuit 101 to receive the first positive voltage and the first negative voltage provided by the power supply circuit. For example, when the first mode control signal is at a first level (e.g., low level), the second driver D2 outputs the first negative voltage to the second switch Q2; when the first mode control signal is at a second level (e.g., high level), the second driver D2 outputs the first positive voltage to the control electrode of the second switch Q2, thereby controlling the second switch Q2 to turn on or off. The specific structures of the first switch Q1 and the second switch Q2 in Figure 7 and their connection relationships can be referred to the specific structures of the first switch Q1 and the second switch Q2 and their connection methods shown in Figures 4 or 5, which will not be elaborated upon here.

[0064] To further optimize the driving performance of the power conversion device 100, the drive circuit group can be further configured with at least one third drive circuit based on the structure shown in Figures 3-7, enabling the drive circuit to perform more refined drive control and thereby achieve multi-level adjustment of the drive speed. For example, please refer to Figure 8, which is a schematic diagram of another drive circuit provided in an embodiment of this application. As shown in Figure 8, the drive circuit group can be further configured with at least one third drive circuit 1033 based on the structure shown in Figures 3-7. The third drive circuit 1033 is connected to the power supply circuit 101 and the control electrode of the power switch 106, and is used to output a third drive voltage to the power switch 106 based on the second mode control signal output by the third controller C3 in the control unit 102 and the first drive voltage output by the first drive circuit 1031 (or first driver D1). The third drive voltage is provided by the power supply circuit 101.

[0065] Specifically, the third driving circuit 1033 includes a third switching circuit 801 and a fourth switching circuit 802. The third switching circuit 801 is connected to the first driving circuit 1031 and is used to turn on or off based on the first driving voltage output by the first driving circuit 1031. The fourth switching circuit 802 is used to turn on or off upon receiving a second mode control signal. The power supply circuit 101, the fourth switching circuit 802, the third switching circuit 801, and the control electrode of the power switch 106 are connected sequentially, such that when both the third switching circuit 801 and the fourth switching circuit 802 are on, the third driving circuit 1033 outputs a third driving voltage to the control electrode of the power switch 106. This third driving voltage is provided by the power supply circuit 101 to turn the power switch 106 on or off. The third driving voltage has the same polarity as the second driving voltage.

[0066] For example, when the power conversion device 100 needs to adopt a "slow drive" strategy (for example, when the power conversion device 100 is in a light load state, the "slow drive" strategy can be adopted to reduce electromagnetic interference, and at this time the power conversion device 100 can enter the first drive mode), the first mode control signal can control the second switch circuit 302 to turn off, the second mode control signal can control the fourth switch circuit 802 to turn off, and the power switch 106 is only driven by the first drive voltage output by the first drive circuit 1031. At this time, the power conversion device 100 (or, the drive circuit group) is in a slow drive mode (or "slow turn-on and slow turn-off mode").

[0067] Optionally, when the power conversion device 100 needs to adopt the "first-level fast drive" strategy (for example, when the power conversion device 100 is under heavy load, the "first-level drive" strategy can be adopted to improve the power conversion efficiency, and at this time the power conversion device 100 can enter the second drive mode), the first mode control signal controls the second switching circuit 302 to turn off, the second mode control signal controls the fourth switching circuit to turn off, and the power switch 106 is turned on or off based on the first drive voltage and the second drive voltage; wherein, if the first switching circuit 301 is turned on based on the first drive voltage being at the first level, and the second drive circuit 1032 outputs the second drive voltage to the power switch 106 based on the first drive voltage being at the first level, and the second drive voltage is at the first level, then the power switch 106 is driven by the first drive voltage output by the first drive circuit 1031 and the second drive voltage output by the second drive circuit 1032. Alternatively, when the power conversion device 100 needs to adopt the "first-level fast drive" strategy, the first mode control signal controls the second switching circuit 302 to turn off, and the second mode control signal controls the fourth switching circuit 802. The power switch 106 is turned on or off based on the first driving voltage and the third driving voltage. Specifically, if the third switching circuit 801 is turned on based on the first driving voltage being at the first level, the third driving circuit 1033 outputs a third driving voltage to the power switch 106 based on the first driving voltage being at the first level, and the third driving voltage is at the first level. At this time, the power switch 106 is driven by the first driving voltage output by the first driving circuit 1031 and the second driving voltage output by the second driving circuit 1032 (or by the first driving voltage output by the first driving circuit 1031 and the third driving voltage output by the third driving circuit 1033). At this time, the power conversion device 100 (or the drive circuit group) is in the first-level fast drive mode (or "slow turn-on fast turn-off mode" or "fast turn-on slow turn-off mode").

[0068] Optionally, when the power conversion device 100 needs to adopt a "second-level fast drive" strategy (for example, when the power conversion device 100 is under heavy load, it can adopt a "second-level drive" strategy to further improve the power conversion efficiency, at which time the power conversion device 100 can enter the third drive mode), the first mode control signal controls the second switching circuit 302 to turn off, the second mode control signal controls the fourth switching circuit 802 to turn on, and the power switch 106 is turned on or off based on the first drive voltage, the second drive voltage, and the third drive voltage; wherein, if the first switching circuit is turned on based on the first drive voltage being at the first level, the second drive circuit outputs a second drive voltage to the power switch based on the first drive voltage being at the first level, and the second drive voltage is at the first level; if the third switching circuit is turned on based on the first drive voltage being at the first level, the third drive circuit outputs a third drive voltage to the power switch based on the first drive voltage being at the first level, and the third drive voltage is at the first level. At this time, the power switch is driven by the first driving voltage output by the first driving circuit, the second driving voltage output by the second driving circuit, and the third driving voltage output by the third driving circuit. At this time, the power conversion device 100 (or driving circuit group) is in the second level fast driving mode (or "slow turn-on ultra-fast turn-off mode" or "ultra-fast turn-on slow turn-off mode").

[0069] Please refer to Figure 8. The third switching circuit 801 can be constructed using the third switching transistor Q3, and the fourth switching circuit 802 can be constructed using the fourth switching transistor Q4. The third switching transistor Q3 and the fourth switching transistor Q4 have the same bias polarity, which is different from the bias polarity of the first switching transistor Q1. The control terminal of the third switching transistor Q3 is connected to the first driving circuit 1031 (or the port where the first driver D1 outputs the first driving voltage), and is used to receive the first driving voltage output by the first driving circuit 1031 (or the first driver D1), and to turn the third switching transistor Q3 on or off based on the first driving voltage. The control terminal of the fourth switching transistor Q4 is connected to the third controller C3, and is used to receive the second mode control signal sent by the third controller C3 to turn the fourth switching transistor Q4 on or off.

[0070] As shown in Figure 8, the third driving circuit 1033 may further include a third driving resistor R3. The first terminal of the third switching transistor Q3 is connected to the third driving resistor R3; the second terminal of the third switching transistor Q3 is connected to the first terminal of the fourth switching transistor Q4; the second terminal of the fourth switching transistor Q4 is connected to the power supply circuit 101 to receive the second power supply voltage provided by the power supply circuit 101, the second power supply voltage having the same polarity as the first power supply voltage; the end of the third driving resistor R3 not connected to the fourth switching transistor Q4 serves as the output terminal of the third driving circuit 1033, and the output terminal of the third driving circuit 1033 is connected to the control terminal of the power switching transistor 106 to output the second power supply voltage to the control terminal of the power switching transistor when both the third switching transistor Q3 and the fourth switching transistor Q4 are turned on. The specific structures of the first switching transistor Q1 and the second switching transistor Q2, and the third switching transistor Q3 and the fourth switching transistor Q4 in Figure 8, and their connection relationships, can be referred to the specific structures of the first switching transistor Q1 and the second switching transistor Q2 and their connection methods shown in Figures 4 or 5, and will not be elaborated upon here.

[0071] For example, if the power switch 106 is turned off based on the low level of the drive voltage of the input control electrode, in order to further improve the turn-off speed of the power switch 106 compared with the power conversion device shown in the corresponding embodiment of FIG3, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 can be set as switches that are "turned on based on the low level of the drive voltage of the input control electrode (at this time, the low level is the first level)", and the power supply circuit 101 provides a first power supply voltage with a low level to the second electrode of the second switch Q2 and a second power supply voltage with a low level to the second electrode of the fourth switch Q4. In this configuration, if the first mode control signal is low and the second mode control signal is low, then the second switch Q2 and the fourth switch Q4 are turned on. When the first drive voltage is low, the first switch Q1 and the third switch Q3 are turned on. The second drive circuit 1032 and the third drive circuit 1033 can output a first negative voltage to the control electrode of the power switch 106. At this time, the power switch 106 can be driven by the low-level first drive voltage and the first negative voltage output by the second drive circuit 1032 and the third drive circuit 1033, thereby achieving the second-level fast turn-off.

[0072] Correspondingly, if the power switch 106 is turned on based on the high level of the drive voltage of the input control electrode, in order to further improve the turn-on speed of the power switch 106 compared with the power conversion device shown in the corresponding embodiment of FIG3, the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 can be set as switches that are turned on based on the high level of the drive voltage of the input control electrode (at this time, the high level is the first level), and the power supply circuit 101 provides a first power supply voltage with a high level to the second electrode of the second switch Q2 and a second power supply voltage with a high level to the second electrode of the fourth switch Q4. In this configuration, if the first mode control signal is high and the second mode control signal is high, then the second switch Q2 and the fourth switch Q4 are turned on. When the first drive voltage is high, the first switch Q1 and the third switch Q3 are turned on. The second drive circuit 1032 and the third drive circuit 1033 can output a first positive voltage to the control electrode of the power switch 106. At this time, the power switch 106 can be driven by the high-level first drive voltage and the first positive voltage output by the second drive circuit 1032 and the third drive circuit 1033, thus achieving the second-level fast turn-on.

[0073] It is possible that when the second drive circuit 1032 fails to work properly, the power conversion device 100 can meet the working requirements when the power conversion device 100 needs to adopt a fast drive strategy by enabling the third drive circuit 1033 (understandably, the third drive circuit 1033 can also serve as a backup circuit for the second drive circuit 1032).

[0074] In one possible implementation, the conduction conditions of the third switching circuit (and the fourth switching circuit) can be set to be different from those of the first switching circuit (and the second switching circuit) (e.g., the third switching circuit is turned on based on the first driving voltage being at the second level, and the fourth switching circuit is turned on based on the second mode control signal being at the second level), such that the polarities of the third driving voltage and the second driving voltage are different (e.g., the second driving voltage is at the first level, and the third driving voltage is at the second level), thereby controlling the power switch 106 to quickly turn off and on based on the first driving circuit, the second driving circuit, and the third driving circuit. For example, if the power switch 106 is turned off when the drive voltage of the input control electrode is low and turned on when the drive voltage of the input control electrode is high, the first switch Q1 and the second switch Q2 can be set as switches that are turned on when the drive voltage of the input control electrode is low (at this time, low level is the first level), and the third switch Q3 and the fourth switch Q4 can be set as switches that are turned on when the drive voltage of the input control electrode is high (at this time, high level is the second level). The power supply circuit 101 provides a first supply voltage of low level to the second terminal of the second switch Q2 and a second supply voltage of high level to the second terminal of the fourth switch Q4. Wherein, if the first mode control signal is low and the second mode control signal is high, then the second switch Q2 and the fourth switch Q4 are turned on. Furthermore, when the first driving voltage is low, the first switch Q1 is turned on and the third switch Q3 is turned off. The second driving circuit 1032 can output a first negative voltage to the control electrode of the power switch 106. At this time, the power switch 106 can be driven by the low-level first driving voltage and the first negative voltage output by the second driving circuit 1032, realizing the rapid turn-off of the power switch 106. When the first driving voltage is high, the first switch Q1 is turned off and the third switch Q3 is turned on. The third driving circuit 1033 can output a first positive voltage to the control electrode of the power switch 106. At this time, the power switch 106 can be driven by the high-level first driving voltage and the first positive voltage output by the third driving circuit 1033, realizing the rapid turn-on of the power switch 106.

[0075] For example, if the first switch Q1 and the second switch Q2 in the second drive circuit 1032 are set as PNP transistors (and obtain the first negative voltage from the power supply circuit 101), and the third switch Q3 and the fourth switch Q4 in the third drive circuit 1033 are set as NPN transistors (and obtain the first positive voltage from the power supply circuit 101), when the second controller C2 controls the second switch Q2 to turn on and the third controller C3 controls the fourth switch Q4 to turn on, the second drive circuit 1032 can be turned on based on the first drive voltage being low. At this time, the power switch 106 can be driven by the low-level first drive voltage and the first negative voltage to achieve rapid turn-off; the third drive circuit 1033 can be turned on based on the first drive voltage being high. At this time, the power switch 106 can be driven by the high-level first drive voltage and the first positive voltage to achieve rapid turn-on.

[0076] In another possible implementation, to enable the power switch 106 to turn off and turn on quickly while reducing the complexity of the internal wiring structure of the power conversion device 100, a drive circuit structure as shown in Figure 9 can be adopted. Please refer to Figure 9, which is a schematic diagram of another drive circuit provided in this application embodiment. As shown in Figure 9, the second drive circuit 1032, based on the one shown in Figure 3, may further include an inverting circuit 901, a fifth switching circuit 902, and a sixth switching circuit 903. The inverting circuit 901 connects the connection point between the second switching circuit 302 and the second controller C2, and is used to receive and flip the level of the first mode control signal. This helps to achieve the effect of "using the same first mode control signal to control two switching circuits (or switches) with different bias polarities," reducing the complexity of the internal wiring structure of the power conversion device 100. Furthermore, the inverter circuit 901 is also connected to the sixth switch circuit 903, which is used to output the first mode control signal to the sixth switch circuit 903 after level inversion processing, so as to control the conduction and turn-off of the sixth switch circuit 903; the fifth switch circuit 902 is connected to the first drive circuit 1031, and is used to turn on or off based on the first drive voltage output by the first drive circuit 1031. The power supply circuit 101, the sixth switch circuit 903, the fifth switch circuit 902, and the control electrode of the power switch 106 are connected in sequence, so that the second drive circuit 1032 is also used to output a fourth drive voltage to the control electrode of the power switch when both the fifth switch circuit 902 and the sixth switch circuit 903 are on, so as to turn on or off the power switch. The polarity of the fourth drive voltage is different from that of the second drive voltage.

[0077] In the fourth driving mode (or "fast turn-on and fast turn-off mode"), the first mode control signal controls the second switching circuit to turn on, and after level inversion, the first mode control signal controls the sixth switching circuit to turn off. The power switch is turned on or off based on the first driving voltage and the second driving voltage. The first switching circuit turns on when the first driving voltage is at a first level, and the second driving circuit outputs a second driving voltage to the power switch when the first driving voltage is at a first level; the second driving voltage is at the first level. Alternatively, in the fourth driving mode, the first mode control signal controls the second switching circuit to turn off, and after level inversion, the first mode control signal controls the sixth switching circuit to turn on. The power switch is turned on or off based on the first driving voltage and the fourth driving voltage. The fifth switching circuit turns on when the first driving voltage is at a second level, and the second driving circuit outputs a fourth driving voltage to the power switch when the first driving voltage is at a second level; the fourth driving voltage is at the second level.

[0078] For example, as shown in Figure 9, the inverter circuit 901 can be constructed using an inverter, the fifth switch circuit 902 can be constructed using a fifth switch transistor Q5, and the sixth switch circuit 903 can be constructed using a sixth switch transistor Q6. The bias polarities of the fifth switch transistor Q5 and the sixth switch transistor Q6 are the same, but different from the bias polarity of the first switch transistor Q1. The control terminal of the fifth switch transistor Q5 is connected to the first drive circuit 1031 to receive the first drive voltage output by the first drive circuit 1031, and to turn the fifth switch transistor Q5 on or off based on the first drive voltage. The control terminal of the sixth switch transistor Q6 is connected to the output terminal of the inverter to receive the first mode control signal output by the inverter after level inversion processing, and to turn the sixth switch transistor Q6 on or off based on the first mode control signal after level inversion processing.

[0079] As shown in Figure 9, the second driving circuit 1032 may further include a fourth driving resistor R4. The first terminal of the fifth switch Q5 is connected to the fourth driving resistor R4, and the second terminal of the fifth switch Q5 is connected to the first terminal of the sixth switch Q6. The second terminal of the sixth switch Q6 is connected to the power supply circuit 101 to receive a third power supply voltage provided by the power supply circuit 101. The third power supply voltage has a different polarity than the first power supply voltage. The end of the fourth driving resistor R4 not connected to the fifth switch Q5 serves as the second output terminal of the second driving circuit 1032. The second output terminal is connected to the control terminal of the power switch 106 to output the third power supply voltage to the control terminal of the power switch when both the fifth switch Q5 and the sixth switch Q6 are turned on. The specific structures of the first switch Q1 and the second switch Q2, and the fifth switch Q5 and the sixth switch Q6 in Figure 9, and their connections, can be referred to the specific structures of the first switch Q1 and the second switch Q2 and their connections shown in Figures 4 or 5. These details are not elaborated upon here.

[0080] For example, if the power switch 106 is turned off when the drive voltage of the input control electrode is low and turned on when the drive voltage of the input control electrode is high, in order to improve the turn-off and turn-on speed of the power switch 106, the first switch Q1 and the second switch Q2 can be set as switches that are turned on when the drive voltage of the input control electrode is low (at this time, the low level is the first level), and the fifth switch Q5 and the sixth switch Q6 can be set as switches that are turned on when the drive voltage of the input control electrode is high (at this time, the high level is the second level). The power supply circuit 101 provides a first power supply voltage with a low level to the second terminal of the second switch Q2 and a second power supply voltage with a high level to the second terminal of the sixth switch Q6. In this configuration, if the first mode control signal is low, then the second switch Q2 is turned on, and the sixth switch Q6 is turned on by receiving the first mode control signal after level inversion from the inverter (which can be understood as the mode control signal received by the sixth switch being high). When the first drive voltage is low, the first switch Q1 is turned on and the fifth switch Q5 is turned off. The second drive circuit 1032 can then output a first negative voltage to the control electrode of the power switch 106 through its first output terminal. At this time, the power switch 106 can be driven by the low-level first drive voltage and the first negative voltage to achieve rapid turn-off. When the first drive voltage is high, the first switch Q1 is turned off and the fifth switch Q5 is turned on. The second drive circuit 1032 can then output a first positive voltage to the control electrode of the power switch 106 through its second output terminal. At this time, the power switch 106 can be driven by the high-level first drive voltage and the first positive voltage to achieve rapid turn-off.

[0081] In another possible implementation, when multiple power switching transistors 106 are configured in the power conversion circuit 104, each power switching transistor 106 is connected to a group of drive circuits. The second drive circuits 1032 in each drive circuit group receive the same first mode control signal. Alternatively, all second drive circuits 1032 are coupled to the connection point of the second controller C2. This helps to simplify the wiring structure inside the power conversion device 100 while ensuring drive performance, thus reducing the manufacturing cost of the power conversion device. Please refer to Figures 3 and 10. Figure 10 is a schematic diagram of the coupling of a multi-path drive circuit group provided in an embodiment of this application. As shown in Figure 10, the power conversion circuit 104 includes m power switching transistors 106, corresponding to m first drive circuits 1031 and m second drive circuits 1032, where m is a positive integer. The controllers connected to the m first drive circuits 1031 can be the same or different, and they are used to receive drive control signals. The m second drive circuits 1032 all receive the first mode control signal output by the second controller C2. For example, the control electrodes of the second switching transistors Q2 in each of the second driving circuits 1032 can be connected. This simplifies the wiring structure inside the power conversion device 100 and reduces the manufacturing cost of the power conversion device, while ensuring that each of the second driving circuits 1032 can receive the first mode control signal. The specific structures of the first switching transistor Q1 and the second switching transistor Q2 in Figure 10 and their connection relationships can be referred to the specific structures of the first switching transistor Q1 and the second switching transistor Q2 and their connection methods shown in Figures 4 or 5, and will not be elaborated upon here.

[0082] It should be noted that if the switching transistors mentioned in the embodiments of this application (such as the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the fifth switching transistor Q5, the sixth switching transistor Q6, the seventh switching transistor Q7, and the eighth switching transistor Q8) are NMOS transistors, their first terminal can refer to the drain of the NMOS transistor, their second terminal can refer to the source of the NMOS transistor, and their control terminal can refer to the gate of the NMOS transistor; if the switching transistors mentioned in the embodiments of this application are P-type metal-oxide-semiconductor (P-Metal-Oxide-Semiconductor) transistors... A PMOS transistor (or PMOS tube) has a first terminal that can be the source, a second terminal that can be the drain, and a control terminal that can be the gate. If the switching transistor mentioned in this embodiment is an NPN transistor, its first terminal can be the collector, its second terminal can be the emitter, and its control terminal can be the base. If the switching transistor mentioned in this embodiment is a PNP transistor, its first terminal can be the emitter, its second terminal can be the collector, and its control terminal can be the base.

[0083] It should be noted that the first drive circuit described in Figures 8-10 can be configured as a push-pull circuit as in Figure 6, and the second drive circuit described in Figures 8-10 can be configured as a second driver as in Figure 7. For the specific connection methods between the push-pull circuit and the second driver and other components in the drive circuit, please refer to Figure 6 or Figure 7, which will not be elaborated here.

[0084] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0085] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM or random access memory (RAM), magnetic disks, or optical disks.

[0086] In summary, the above description is merely an embodiment of the technical solution of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made based on the disclosure of this application should be included within the scope of protection of this application.

Claims

1. A power conversion device, characterized in that, The power conversion device includes: a power switch transistor and a drive circuit group corresponding to the power switch transistor. The drive circuit group includes a first drive circuit and a second drive circuit. The first drive circuit is connected to the control electrode of the power switch transistor and the second drive circuit, and is used to receive a drive control signal and output a first drive voltage to the power switch transistor and the second drive circuit. The second drive circuit includes a first switch circuit and a second switch circuit connected in series. The first switch circuit is connected to the first drive circuit and is used to turn on or off based on the first drive voltage. The second switch circuit is connected to receive a first mode control signal and is used to turn on or off. The second drive circuit is connected to the control electrode of the power switch transistor, and when both the first switch circuit and the second switch circuit are on, the second drive circuit outputs a second drive voltage to the control electrode of the power switch transistor. Both the first drive voltage and the second drive voltage are used to turn the power switch transistor on or off.

2. The power conversion device according to claim 1, characterized in that, When the power conversion device is in the first driving mode, the first mode control signal controls the second switching circuit to turn off, and the power switching transistor is turned on or off based on the first driving voltage; when the power conversion device is in the second driving mode, the first mode control signal controls the second switching circuit to turn on, and the power switching transistor is turned on or off based on the first driving voltage and the second driving voltage; wherein, the first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs the second driving voltage to the power switching transistor when the first driving voltage is at a first level, and the second driving voltage is at the first level.

3. The power conversion device according to claim 1 or 2, characterized in that, The drive circuit group further includes a third drive circuit, which includes a third switch circuit and a fourth switch circuit. The third switch circuit is connected to the first drive circuit and is used to turn on or off based on a first drive voltage output by the first drive circuit. The fourth switch circuit is used to turn on or off upon receiving a second mode control signal. When both the third switch circuit and the fourth switch circuit are on, the third drive circuit outputs a third drive voltage to the control electrode of the power switch to turn the power switch on or off. The third drive voltage has the same polarity as the second drive voltage.

4. The power conversion device according to claim 3, characterized in that, When the power conversion device is in the first driving mode, the first mode control signal controls the second switching circuit to turn off, the second mode control signal controls the fourth switching circuit to turn off, and the power switching transistor is turned on or off based on the first driving voltage.

5. The power conversion device according to claim 3 or 4, characterized in that, When the power conversion device is in the second driving mode, the first mode control signal controls the second switching circuit to turn on, and the second control signal controls the fourth switching circuit to turn off. The power switch is turned on or off based on the first driving voltage and the second driving voltage. Specifically, the first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs the second driving voltage to the power switch when the first driving voltage is at a first level, where the second driving voltage is at the first level. Alternatively, when the power conversion device is in the second driving mode, the first mode control signal controls the second switching circuit to turn off, and the second control signal controls the fourth switching circuit to turn on. The power switch is turned on or off based on the first driving voltage and the third driving voltage. Specifically, the third switching circuit is turned on when the first driving voltage is at a first level, and the third driving circuit outputs the third driving voltage to the power switch when the first driving voltage is at a first level, where the third driving voltage is at the first level.

6. The power conversion device according to any one of claims 3-5, characterized in that, When the power conversion device is in the third driving mode, the first mode control signal controls the second switching circuit to turn on, and the second control signal controls the fourth switching circuit to turn on. The power switch is turned on or off based on the first driving voltage, the second driving voltage, and the third driving voltage. Specifically, the first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs the second driving voltage to the power switch when the first driving voltage is at a first level, wherein the second driving voltage is at a first level. The third switching circuit is turned on when the first driving voltage is at a first level, and the third driving circuit outputs the third driving voltage to the power switch when the first driving voltage is at a first level, wherein the third driving voltage is at a first level.

7. The power conversion device according to claim 1, characterized in that, The second driving circuit further includes an inverting circuit, a fifth switching circuit, and a sixth switching circuit. The inverting circuit is connected to the sixth switching circuit and receives and outputs a first mode control signal after level inversion to the sixth switching circuit to control its on / off state. The fifth switching circuit is connected to the first driving circuit and is turned on or off based on a first driving voltage output by the first driving circuit. The second driving circuit is also used to output a fourth driving voltage to the control electrode of the power switch when both the fifth and sixth switching circuits are on, to turn the power switch on or off. The fourth driving voltage has a different polarity than the second driving voltage. When the power conversion device is in the fourth driving mode, the first mode control signal controls the second switching circuit to turn on, and after level inversion, the first mode control signal controls the sixth switching circuit to turn off. The power switch is turned on or off based on the first driving voltage and the second driving voltage; wherein, the first switching circuit is turned on when the first driving voltage is at a first level, and the second driving circuit outputs the second driving voltage to the power switch when the first driving voltage is at a first level, and the second driving voltage is at a first level; or, when the power conversion device is in the fourth driving mode, the first mode control signal controls the second switching circuit to turn off, and after level inversion processing, the first mode control signal controls the sixth switching circuit to turn on, and the power switch is turned on or off based on the first driving voltage and the fourth driving voltage; wherein, the fifth switching circuit is turned on when the first driving voltage is at a second level, and the second driving circuit outputs the fourth driving voltage to the power switch when the first driving voltage is at a second level, and the fourth driving voltage is at a second level.

8. The power conversion device according to any one of claims 1-7, characterized in that, The power conversion device includes multiple power switches and drive circuit groups corresponding to each power switch; wherein, the second drive circuit in each drive circuit group receives the same first mode control signal.

9. The power conversion device according to any one of claims 1-8, characterized in that, The power conversion device further includes a first controller; the first drive circuit includes a first driver and a first drive resistor; the first driver is connected to the first controller and the second drive circuit, and is used to receive the drive control signal output by the first controller and output the first drive voltage to the first drive resistor and the second drive circuit; The first driving resistor is not connected to one end of the first driver as the output terminal of the first driving circuit. The output terminal of the first driving circuit is connected to the control electrode of the power switch transistor to output the first driving voltage to the power switch transistor.

10. The power conversion device according to claim 9, characterized in that, The power conversion device further includes a power supply circuit and a second controller; the power supply circuit, the second switching circuit, the first switching circuit, and the control electrode of the power switching transistor are connected in sequence; the first switching circuit includes a first switching transistor, the control electrode of the first switching transistor is connected to the first driving circuit, and is used to receive a first driving voltage output by the first driving circuit, and to turn the first switching transistor on or off based on the first driving voltage. The second switching circuit includes a second switching transistor, the control electrode of which is connected to the second controller, for receiving the first mode control signal sent by the second controller to turn the second switching transistor on or off; the second switching transistor is connected in series with the first switching transistor; when both the first and second switching transistors are on, the second driving circuit outputs the second driving voltage to the control electrode of the power switching transistor, and the second driving voltage is provided by the power supply circuit.

11. The power conversion device according to claim 3 or 10, characterized in that, The power conversion device further includes a power supply circuit and a third controller; the power supply circuit, the fourth switching circuit, the third switching circuit and the control electrode of the power switching transistor are connected in sequence; the third switching circuit includes a third switching transistor, the control electrode of the third switching transistor is connected to the first driving circuit, and is used to receive the first driving voltage output by the first driving circuit, and to turn on or off the third switching transistor based on the first driving voltage. The fourth switching circuit includes a fourth switching transistor, the control electrode of which is connected to the third controller and is used to receive a second mode control signal sent by the third controller to turn the fourth switching transistor on or off; the fourth switching transistor is connected in series with the third switching transistor; when both the third and fourth switching transistors are turned on, the third driving circuit outputs a third driving voltage to the control electrode of the power switching transistor, and the third driving voltage is provided by the power supply circuit.

12. The power conversion device according to claim 7 or 10, characterized in that, The power conversion device further includes a power supply circuit and a second controller; the power supply circuit, the sixth switch circuit, the fifth switch circuit, and the control electrode of the power switch are connected in sequence; the inverting circuit is connected to the second controller and the sixth switch circuit, and is used to receive the first mode control signal output by the second controller, and output the first mode control signal to the sixth switch circuit after level flipping; The fifth switching circuit includes a fifth switching transistor. The control electrode of the fifth switching transistor is connected to the first driving circuit and is used to receive the first driving voltage output by the first driving circuit, and to turn the fifth switching transistor on or off based on the first driving voltage. The sixth switching circuit includes a sixth switching transistor, the control electrode of which is connected to an inverting circuit to receive a first mode control signal output by the inverting circuit after level inversion processing, and to turn the sixth switching transistor on or off based on the first mode control signal after level inversion processing; the sixth switching transistor is connected in series with the fifth switching transistor; when both the fifth and sixth switching transistors are turned on, the second driving circuit outputs a fourth driving voltage to the control electrode of the power switching transistor, the fourth driving voltage being provided by the power supply circuit.

13. The power conversion device according to any one of claims 10-12, characterized in that, The first switching transistor and the second switching transistor have the same bias polarity; the second driving circuit further includes a second driving resistor, the first terminal of the first switching transistor is connected to the second driving resistor, and the second terminal of the first switching transistor is connected to the first terminal of the second switching transistor; the second terminal of the second switching transistor is connected to the power supply circuit for receiving the first power supply voltage provided by the power supply circuit; The end of the second driving resistor that is not connected to the first switching transistor serves as the first output terminal of the second driving circuit. The first output terminal is connected to the control electrode of the power switching transistor and is used to output the first supply voltage to the control electrode of the power switching transistor when both the first and second switching transistors are turned on.

14. The power conversion device according to claim 13, characterized in that, The second driving circuit further includes a second driver, one end of which is connected to the control electrode of the second switching transistor, and the other end of which is connected to the second controller. The second driver is used to receive and amplify the first mode control signal output by the second controller, and output the amplified first mode control signal to the second switching transistor to turn the second switching transistor on or off.

15. The power conversion device according to claim 11, 13 or 14, characterized in that, The third and fourth switching transistors have the same bias polarity, and the same bias polarity as the first switching transistor; the third driving circuit also includes a third driving resistor, the first terminal of the third switching transistor is connected to the third driving resistor; the second terminal of the third switching transistor is connected to the first terminal of the fourth switching transistor; the second terminal of the fourth switching transistor is connected to the power supply circuit, and is used to receive a second power supply voltage provided by the power supply circuit, the second power supply voltage having the same polarity as the first power supply voltage; The end of the third driving resistor that is not connected to the fourth switching transistor serves as the output terminal of the third driving circuit. The output terminal of the third driving circuit is connected to the control electrode of the power switching transistor and is used to output the second supply voltage to the control electrode of the power switching transistor when both the third and fourth switching transistors are turned on.

16. The power conversion device according to any one of claims 12-14, characterized in that, The fifth and sixth switching transistors have the same bias polarity, but a different bias polarity than the first switching transistor. The second driving circuit also includes a fourth driving resistor. The first terminal of the fifth switching transistor is connected to the fourth driving resistor, and the second terminal of the fifth switching transistor is connected to the first terminal of the sixth switching transistor. The second terminal of the sixth switching transistor is connected to the power supply circuit to receive a third power supply voltage provided by the power supply circuit. The third power supply voltage has a different polarity than the first power supply voltage. The end of the fourth driving resistor that is not connected to the fifth switching transistor serves as the second output terminal of the second driving circuit. The second output terminal is connected to the control electrode of the power switching transistor and is used to output the third supply voltage to the control electrode of the power switching transistor when both the fifth and sixth switching transistors are turned on.

17. The power conversion device according to any one of claims 9-16, characterized in that, The end of the first driver connected to the first driving resistor is connected to at least one of the control terminals of the first switching transistor, the third switching transistor, and the fifth switching transistor.

18. The power conversion device according to any one of claims 9-17, characterized in that, The first driving circuit further includes a push-pull circuit, which is connected to the first driver and the first driving resistor. The push-pull circuit is used to amplify the first driving voltage output by the first driver and output the amplified first driving voltage to the first driving resistor.

19. The power conversion device according to claim 18, characterized in that, The push-pull circuit includes a seventh switch and an eighth switch, the seventh switch and the eighth switch having different bias polarities; wherein, the control terminal of the seventh switch is connected to the control terminal of the eighth switch and connected to the first driver, for receiving the first driving voltage output by the first driver; the first terminal of the seventh switch is connected to the first terminal of the eighth switch and connected to the first driving resistor, for outputting the amplified first driving voltage to the first driving resistor.

20. The power conversion device according to any one of claims 1-19, characterized in that, The power switch is turned off based on a low level, where the first level is low; the first switching circuit is turned on based on the first driving voltage being low, and the second switching circuit is turned on when the first mode control signal is low; the second driving circuit outputs a low level to the power switch when both the first and second switching circuits are on.

21. The power conversion device according to any one of claims 1-19, characterized in that, The power switch is turned on based on a high level, where the first level is high; the first switching circuit is turned on based on the first driving voltage being high, and the second switching circuit is turned on when the first mode control signal is high; the second driving circuit outputs a high level to the power switch when both the first and second switching circuits are turned on.

22. A switching circuit, characterized in that, The switching circuit includes a target switch, a first driving circuit, and a second driving circuit. The first driving circuit connects the target switch and the second driving circuit, and receives a driving control signal to output a first driving voltage to the target switch and the second driving circuit. The second driving circuit includes a first switching circuit and a second switching circuit connected in series. The first switching circuit is connected to the first driving circuit and is used to turn on or off based on the first driving voltage. The second switching circuit is connected to the control unit and receives a first mode control signal to turn on or off. The second driving circuit is connected to the control electrode of the power switch, and outputs a second driving voltage to the control electrode of the target switch when both the first and second switching circuits are on. Both the first driving voltage and the second driving voltage are used to turn the target switch on or off.

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