Transient response enhancement control circuit used for switch power source

A switching power supply, transient response technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve problems such as poor transient response of switching power supply, achieve fast load response, improve transient response characteristics, and good transient response Effects of Features

Inactive Publication Date: 2013-12-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a transient response enhancement control circuit for switching power supplies to solve the problem of poor transient response of existing switching power supplies

Method used

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  • Transient response enhancement control circuit used for switch power source
  • Transient response enhancement control circuit used for switch power source
  • Transient response enhancement control circuit used for switch power source

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Aiming at the problem of poor transient response of the output voltage when the switching power supply jumps from heavy load to light load, the present invention proposes a transient response enhancement control circuit suitable for switching power supply. The specific circuit structure is as follows figure 2 , image 3 , Figure 4 , Figure 5 shown.

[0027] The structure of the present invention is as figure 2 As shown, it includes a frequency divider module FD, a memory module FS, and a comparator module COMP. The specific connection relationship is as follows: the first end of the frequency divider module FD is connected to the drive signal HS of the high-end power transistor, the second end is connected to the reset signal RST, and the third end is connected to the first end of the memory module FS. The frequency divider modu...

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Abstract

The invention relates to a switch power source technology, and discloses a transient response enhancement control circuit used for a switch power source. According to the technical scheme, the transient response enhancement control circuit used for the switch power source comprises a frequency divider module, a storage module and a comparator module. The frequency divider module is connected with driving signals of a high-end power tube of the switch power source and used for generating control signals according to the driving signals to control the storage module. The storage module is connected with a feedback current, and collects and stores the maximum value of the feedback current of the previous period under the control of the control signals. The comparator module is connected with the storage module and compares an instantaneous value of feedback voltage with the maximum value, when the instantaneous value of the feedback voltage is larger than the maximum value, the output signals of the comparator module turn over, and the high-end power tube of the switch power source is turned off. The transient response enhancement control circuit used for the switch power source effectively overcomes the defect that when the switch power source jumps into a light-load state from a heavy-load state, transient response is poor.

Description

technical field [0001] The invention relates to switching power supply technology, in particular to a transient response enhancement control circuit suitable for switching power supply. Background technique [0002] DC-DC (direct current-direct current) switching converters are widely used in portable electronic devices due to their advantages of high efficiency and energy saving. As a branch of ripple-based control, the control mode has been widely used in recent years because of its simple control loop structure and fast system response. At the same time, in order to ensure a constant switching frequency and optimize EMI noise, some improved ACOT (adaptive on-time) control modes have been proposed. It typically sets the constant on-time either inversely proportional to the input voltage, or proportional to the output voltage. But when the load current jumps from heavy load to light load, the output voltage will rise instantaneously because the conduction time controlled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
Inventor 周泽坤刘德尚朱世鸿许天辉段茂平黄建刚石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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