CN-121441264-B - Power tube driving circuit and driver

CN121441264BCN 121441264 BCN121441264 BCN 121441264BCN-121441264-B

Abstract

The application provides a power tube driving circuit and a driver. The driving circuit comprises a transmission gate driving module, a transmission gate module, a bootstrap module and a power tube, wherein a first end of the bootstrap module is used for being connected with a first power supply, a second end of the bootstrap module is connected with a control end of the power tube, the bootstrap module is used for driving the power tube, the first end of the transmission gate driving module is used for receiving pulse signals, the second end of the transmission gate driving module is connected with the control end of the transmission gate module, the transmission gate driving module is used for driving the transmission gate module to be in a conducting state or a switching-off state according to the pulse signals, an input end of the power tube is used for being connected with a second power supply, an output end of the power tube is connected with an input end of the transmission gate module, and an output end of the transmission gate module is used for being connected with a device to be driven. The application can reduce the device faults caused by signals and improve the stability of signal transmission.

Inventors

SHI XIANG
ZHAO BOJIE
ZHANG HAO
QU HANBIN
TAN XIAOYAN
SHI YAPAN
LI ZHANLONG
CUI BAOFENG
REN XIAOWEI

Assignees

河北新华北集成电路有限公司

Dates

Publication Date: 20260508
Application Date: 20251022

Claims (8)

1. The power tube driving circuit is characterized by comprising a transmission gate driving module, a transmission gate module, a bootstrap module and a power tube; The first end of the bootstrap module is used for being connected with a first power supply, the second end of the bootstrap module is connected with the control end of the power tube, and the bootstrap module is used for driving the power tube; the first end of the transmission gate driving module is used for receiving a pulse signal, the second end of the transmission gate driving module is connected with the control end of the transmission gate module, and the transmission gate driving module is used for driving the transmission gate module to be in a conducting state or a switching-off state according to the pulse signal; The input end of the power tube is used for being connected with a second power supply, the output end of the power tube is connected with the input end of the transmission gate module, and the output end of the transmission gate module is used for being connected with a device to be driven; the bootstrap module comprises a bootstrap diode and a bootstrap capacitor; The anode of the bootstrap diode is used for connecting with the first power supply; the cathode of the bootstrap diode is connected with the control end of the power tube and the anode of the bootstrap capacitor; The positive electrode of the bootstrap capacitor is also connected with the positive electrode of the power supply of the transmission gate driving module; the negative electrode of the bootstrap capacitor is connected with the output end of the transmission gate module and the negative electrode of the power supply of the transmission gate driving module; The driving circuit further comprises a discharge tube driving module and a discharge tube; The first end of the discharge tube driving module is used for receiving the pulse signal, and the second end of the discharge tube driving module is connected with the control end of the discharge tube; the input end of the discharge tube is connected with the output end of the transmission gate module; the output end of the discharge tube is used for grounding.
2. The power tube driving circuit as claimed in claim 1, wherein the bootstrap module further comprises a current limiting resistor; and the cathode of the bootstrap diode is connected with the control end of the power tube and the anode of the bootstrap capacitor through the current limiting resistor.
3. The power tube driving circuit according to claim 1, wherein the transmission gate module comprises a first switching tube and a second switching tube; the input end of the first switching tube is connected with the input end of the second switching tube and is used as the input end of the transmission gate module; The output end of the first switching tube is connected with the output end of the second switching tube and is used as the output end of the transmission gate module; and the output end of the transmission gate driving module is connected with the control end of the first switching tube and the control end of the second switching tube.
4. The power tube driving circuit as claimed in claim 3, wherein the first switching tube is an N-type switching tube and the second switching tube is a P-type switching tube; or the first switching tube is a P-type switching tube, and the second switching tube is an N-type switching tube.
5. The power tube driving circuit as claimed in claim 1, wherein the power tube driving circuit further comprises a level shift module; the input end of the level shifting module is used for receiving the pulse signal; And the output end of the level shifting module is connected with the first end of the transmission gate driving module.
6. The power tube driving circuit as claimed in claim 5, wherein a voltage of the second power supply is higher than a voltage of the first power supply; The positive electrode of the power supply of the level transfer module is used for connecting the first power supply; The high-voltage power supply anode of the level shifting module is used for connecting with the anode of the bootstrap capacitor; And the power supply cathode of the level shifting module is used for connecting with the cathode of the bootstrap capacitor.
7. The power tube driving circuit according to any one of claims 1 to 4, further comprising an input stage module and a level shift module; The input end of the input stage module is used for receiving the pulse signal; the output end of the input stage module is connected with the first end of the transmission gate driving module through the level transfer module.
8. A driver comprising a power tube driving circuit as claimed in any one of claims 1 to 7.

Description

Power tube driving circuit and driver Technical Field The present disclosure relates to electronic circuits, and particularly to a power tube driving circuit and a driver. Background The power tube driving circuit is a core unit for realizing load control and is widely applied to the scenes such as control and modulation of a switching power supply. The power tube driving circuit controls the switch and the on time of a switch tube in the switch power supply through the output signal, and the output voltage of the switch power supply is adjusted. Along with the development of the switching power supply, the power tube driving circuit is required to respond quickly, the frequency of an output signal is improved, and the requirement of the development of the switching power supply in the high-frequency direction is met. However, in the traditional mode of driving the power tube by using the power tube driving circuit, the rated power of the power tube is larger, and the grid capacitance is often larger, so that a longer Miller platform is caused by the grid capacitance, the response speed of the power tube and the switching power supply is seriously influenced, and the development of the switching power supply in the high-frequency direction is restricted. Disclosure of Invention The embodiment of the application provides a power tube driving circuit and a driver, which are used for solving the problem of slower response speed of the power tube driving circuit and improving the frequency of an output signal of the driving circuit. In a first aspect, an embodiment of the present application provides a power tube driving circuit, including a transmission gate driving module, a transmission gate module, a bootstrap module, and a power tube; The first end of the bootstrap module is used for being connected with a first power supply, the second end of the bootstrap module is connected with the control end of the power tube, and the bootstrap module is used for driving the power tube; the first end of the transmission gate driving module is used for receiving a pulse signal, the second end of the transmission gate driving module is connected with the control end of the transmission gate module, and the transmission gate driving module is used for driving the transmission gate module to be in a conducting state or a switching-off state according to the pulse signal; The input end of the power tube is used for being connected with a second power supply, the output end of the power tube is connected with the input end of the transmission gate module, and the output end of the transmission gate module is used for being connected with a device to be driven. In one possible implementation, the bootstrap module includes a bootstrap diode and a bootstrap capacitor; The anode of the bootstrap diode is used for connecting with the first power supply; the cathode of the bootstrap diode is connected with the control end of the power tube and the anode of the bootstrap capacitor; The positive electrode of the bootstrap capacitor is also connected with the positive electrode of the power supply of the transmission gate driving module; and the negative electrode of the bootstrap capacitor is connected with the output end of the transmission gate module and the negative electrode of the power supply of the transmission gate driving module. In one possible implementation, the bootstrap module further includes a current limiting resistor; and the cathode of the bootstrap diode is connected with the control end of the power tube and the anode of the bootstrap capacitor through the current limiting resistor. In one possible implementation, the transmission gate module includes a first switching tube and a second switching tube; the input end of the first switching tube is connected with the input end of the second switching tube and is used as the input end of the transmission gate module; The output end of the first switching tube is connected with the output end of the second switching tube and is used as the output end of the transmission gate module; and the output end of the transmission gate driving module is connected with the control end of the first switching tube and the control end of the second switching tube. In one possible implementation manner, the first switching tube is an N-type switching tube, and the second switching tube is a P-type switching tube; or the first switching tube is a P-type switching tube, and the second switching tube is an N-type switching tube. In one possible implementation, the driving circuit further includes a discharge tube driving module and a discharge tube; The first end of the discharge tube driving module is used for receiving the pulse signal, and the second end of the discharge tube driving module is connected with the control end of the discharge tube; the input end of the discharge tube is connected with the output end of the transmission gate module; the output end of the discharge