CN-122026699-A - Power tube driving circuit, power management chip and electronic equipment

CN122026699ACN 122026699 ACN122026699 ACN 122026699ACN-122026699-A

Abstract

The application provides a power tube driving circuit, a power management chip and electronic equipment, wherein the power tube driving circuit comprises a first driving circuit, a second driving circuit and a miller platform detection module which are respectively connected with a grid electrode of a target power tube, the first driving circuit conducts the grid electrode with a power end in the starting process of the target power tube, the miller platform detection module detects that the target power tube has the miller platform phenomenon, a first control signal is output to control the second driving circuit to conduct the grid electrode with the power end, the first driving circuit conducts the grid electrode with a grounding end in the switching-off process of the target power tube, and the miller platform detection module detects that the target power tube has the miller platform phenomenon and outputs a second control signal to control the second driving circuit to conduct the grid electrode with the grounding end. The method can realize the sectional driving of the power tube, so that the power tube quickly skips the transition area caused by the Miller platform, shortens the time of the whole transition process, and reduces the switching loss of the power tube.

Inventors

LIANG YIMIN
HUANG ZIXUAN
XU MIN
QIU ZHENG

Assignees

浙江地芯引力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (10)

1. The power tube driving circuit is characterized by being applied to a power management chip and comprising a first driving circuit, a second driving circuit and a Miller platform detection module which are respectively connected with a grid electrode of a target power tube; in the starting process of the target power tube, the first driving circuit conducts the grid electrode with a power end, the miller platform detection module detects that the target power tube has a miller platform phenomenon, and outputs a first control signal to control the second driving circuit to conduct the grid electrode with the power end; In the process of turning off the target power tube, the first driving circuit conducts the grid electrode and the grounding end, the miller platform detection module detects that the target power tube has the miller platform phenomenon, and outputs a second control signal to control the second driving circuit to conduct the grid electrode and the grounding end.
2. The power tube driving circuit as claimed in claim 1, wherein the first driving circuit comprises a first switch and a second switch connected in series, the first switch being connected to the power supply terminal, the second switch being connected to the ground terminal, the gate being connected between the first switch and the second switch.
3. The power tube driving circuit as claimed in claim 2, further comprising a first logic control module, wherein the first logic control module controls the first switch to be closed and controls the second switch to be opened when a high level is input, and controls the second switch to be closed and controls the first switch to be opened when a low level is input.
4. The power tube driving circuit as claimed in claim 3, wherein the first logic control module comprises a first logic circuit and a second logic circuit; Under the condition of inputting high level, the first logic circuit outputs a high-voltage signal to enable the first switch to be closed, and the second logic circuit outputs a low-voltage signal to enable the second switch to be opened; When a low level is input, the first logic circuit outputs a low-voltage signal to close the first switch, and the second logic circuit outputs a high-voltage signal to close the second switch.
5. The power tube driving circuit as claimed in any one of claims 1 to 4, wherein the second driving circuit comprises a third switch and a fourth switch connected in series, the third switch being connected to the power supply terminal, the fourth switch being connected to the ground terminal, and the gate being connected between the third switch and the fourth switch.
6. The power tube driving circuit as claimed in claim 5, wherein the miller stage detection module comprises a miller stage pre-detection circuit and a second logic control module; In the starting process of the target power tube, the Miller platform pre-detection circuit detects the Miller platform phenomenon of the target power tube and outputs a first logic input signal; In the process of disconnecting the target power tube, the Miller platform pre-detection circuit detects the Miller platform phenomenon of the target power tube and outputs a second logic input signal; the second logic control module controls the fourth switch to be closed based on the second logic input signal.
7. The power tube driving circuit as claimed in claim 6, wherein the miller stage pre-detection circuit comprises a first MOS tube and a second MOS tube connected in series, wherein the gates of the first MOS tube and the second MOS tube are both connected with the gate of the target power tube, the first MOS tube is connected with the power supply terminal, the second MOS tube is connected with the ground terminal, and the second MOS tube and the target power tube are transistors with the same specification; the input end of the second logic control module is connected between the first MOS tube and the second MOS tube.
8. The power tube driving circuit as claimed in claim 7, wherein the second logic control module includes a third logic circuit and a fourth logic circuit, the third logic circuit controlling the third switch to be closed based on the first logic input signal; The fourth logic circuit controls the fourth switch to be closed based on the second logic input signal.
9. A power management chip having integrated thereon the power tube driving circuit of any one of claims 1-8.
10. An electronic device comprising the power management chip of claim 9.

Description

Power tube driving circuit, power management chip and electronic equipment Technical Field The application belongs to the technical field of power management chips, and particularly relates to a power tube driving circuit, a power management chip and electronic equipment. Background With the wider application of chips, especially power supply chips, the requirements on the chips, such as power supply management chips, are higher, and the requirements on the working efficiency of the chips are higher, so that in order to improve the working efficiency of the chips, the loss needs to be reduced as much as possible in the chip design. Common losses for power transistors in a power management chip include switching losses, conduction losses, and drive losses. The reason why the switching loss is formed is that the switching on and off of the power tube is not instantaneously completed, and an overlapping area exists between the current and the voltage due to the existence of a transient process, thereby causing the loss. The conduction loss is mainly related to the on-resistance (Rdson) when the power tube is turned on, and the smaller the Rdson is, the smaller the conduction loss is. The drive loss is mainly related to the amount of charge (Qg) charged by the gate of the power transistor, and the smaller Qg is, the smaller the drive loss is. Currently, in order to reduce the loss of the power tube, common practice is to reduce the conduction loss mainly by increasing the area of the power tube to reduce Rdson, or to reduce the Qg of the power tube by adopting a more advanced process to reduce the driving loss. However, both the above methods of reducing the loss significantly increase the manufacturing cost of the chip due to the increased chip area and the advanced process. Therefore, how to reduce the switching loss of the power tube without increasing the area and the process cost becomes an important point of research by those skilled in the art. It should be noted that the foregoing statements are merely to provide background information related to the present disclosure and may not necessarily constitute prior art. Disclosure of Invention The application provides a power tube driving circuit, a power management chip and electronic equipment, which can realize the sectional driving of a power tube, so that the power tube can quickly skip a transition region caused by a Miller platform, the time of the whole transition process is shortened, and the switching loss of the power tube is reduced. The embodiment of the first aspect of the application provides a power tube driving circuit which is applied to a power management chip and comprises a first driving circuit, a second driving circuit and a Miller platform detection module, wherein the first driving circuit, the second driving circuit and the Miller platform detection module are respectively connected with a grid electrode of a target power tube; in the starting process of the target power tube, the first driving circuit conducts the grid electrode with a power end, the miller platform detection module detects that the target power tube has a miller platform phenomenon, and outputs a first control signal to control the second driving circuit to conduct the grid electrode with the power end; In the process of turning off the target power tube, the first driving circuit conducts the grid electrode and the grounding end, the miller platform detection module detects that the target power tube has the miller platform phenomenon, and outputs a second control signal to control the second driving circuit to conduct the grid electrode and the grounding end. In some alternative embodiments, the first driving circuit includes a first switch and a second switch connected in series, the first switch being connected to the power supply terminal, the second switch being connected to the ground terminal, and the gate being connected between the first switch and the second switch. In some alternative embodiments, the control device further comprises a first logic control module, wherein the first logic control module controls the first switch to be closed and controls the second switch to be opened when a high level is input, and controls the second switch to be closed and controls the first switch to be opened when a low level is input. In some alternative embodiments, the first logic control module includes a first logic circuit and a second logic circuit; Under the condition of inputting high level, the first logic circuit outputs a high-voltage signal to enable the first switch to be closed, and the second logic circuit outputs a low-voltage signal to enable the second switch to be opened; When a low level is input, the first logic circuit outputs a low-voltage signal to close the first switch, and the second logic circuit outputs a high-voltage signal to close the second switch. In some alternative embodiments, the second driving circuit includes a third switch an