Self-adaptive drive circuit for environment-friendly switching mode power supply chip

A switching power supply chip, driving circuit technology, applied in electronic switches, electrical components, pulse technology and other directions, can solve problems such as system delay differences, achieve high conversion efficiency, achieve conversion efficiency, and reduce system delay errors.

Active Publication Date: 2015-01-21
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the traditional current mode drive circuit, the drive current is designed to be a fixed value, so when driving different types of switch tubes, the system delay will often vary greatly due to the influence of load differences

Method used

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  • Self-adaptive drive circuit for environment-friendly switching mode power supply chip
  • Self-adaptive drive circuit for environment-friendly switching mode power supply chip

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Embodiment Construction

[0025] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0026] The present invention aims at the problem that in the current mode driving circuit of the prior art, when the driving current is a fixed value, different types of switching tubes are affected by load differences, and the system delay is greatly different, and provides a green switching power supply chip self-adaptive The driving circuit detects the size of the driving load through the delayer circuit and automatically adjusts the bias voltage of the driving current circuit, thereby controlling the output current of the driving current circuit to reduce the system delay caused by different switching tubes The purpose of error, thus achieving high conversion efficiency.

[0027] like figure 1 , figure 2 As shown, the embodiment of the present inv...

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Abstract

The invention provides a self-adaptive drive circuit for an environment-friendly switching mode power supply chip and relates to the technical field of electronic circuits. The self-adaptive drive circuit comprises a delayer circuit, a drive biasing circuit, a detecting circuit, a clamping circuit and a drive current circuit. The output end of the detecting circuit is connected with the input end of the delayer circuit. The delayer circuit detects drive loads by detecting the time when a signal of the output end of the detecting circuit is at a high level. A bias voltage circuit is connected with the output end of the delayer circuit and used for providing different bias voltages for the drive current circuit according to the drive loads. The clamping circuit is connected with the drive current circuit and used for limiting the maximum of the voltage of the output end of the drive current circuit. The drive current circuit is used for adjusting currents of the output end of the drive current circuit according to the different bias voltages. The circuit adjusts the drive currents according to the drive loads, difference of drive delay under the various loads is reduced, and the high conversion efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an adaptive drive circuit for a green switching power supply chip. Background technique [0002] For MOS tubes (metal-oxide-semiconductor field effect transistors) and BJT tubes (bipolar junction transistors), due to different working principles, MOS tubes are voltage-controlled, and BJT tubes are current-controlled. Therefore, in general, in a switching power supply circuit, the driving mode of the control chip is designed differently for the type of power switching tube (MOS tube or BJT tube). However, the driving method of the current mode can drive two kinds of switching tubes compatible, so it has great advantages. Since there are many types of MOS switch tubes, the size of their gate capacitances also varies greatly. For the traditional current mode driving circuit, the driving current is designed to be a fixed value, so when driving different types of switchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/567H03K17/28
Inventor 吴强朱樟明刘帘曦杨银堂高红
Owner XIDIAN UNIV
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