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Switching power supply soft start circuit for bipolar error amplifier

A technology of error amplifier and soft start circuit, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of limited applicability, poor stability, simple structure, etc., and achieve improved stability and reliability, smooth transition, universal The effect of applicability

Inactive Publication Date: 2014-09-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a soft start circuit for fast response system aiming at the problems of simple structure, poor stability and limited applicability of the above existing soft start circuit

Method used

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  • Switching power supply soft start circuit for bipolar error amplifier
  • Switching power supply soft start circuit for bipolar error amplifier
  • Switching power supply soft start circuit for bipolar error amplifier

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Embodiment Construction

[0012] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0013] Existing conventional soft-start circuits utilize comparator and switching principles such as figure 1 As shown, when the chip is first powered on, C SS1 Terminal potential V SS1 =0, at the same time the DC current source I B11 start to C SS1 charge so that V SS1 voltage gradually increases, at this time V REF1 >V SS1 , the comparator COM2 outputs a high level, the switch tube MN1 is turned on, the comparator COM1 outputs a low level, the switch tube MN2 is turned off, and the error amplifier turns V SS1 The voltage of the switching power supply is used as the reference voltage, and the duty cycle of the switching tube drive waveform is adjusted by using the loop feedback principle, so that the output voltage of the switching power supply gradually increases. When C SS1 terminal voltage V SS1 raised to V REF1 , the comparator COM2 is triggered, ...

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PUM

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Abstract

The invention relates to the technical field of analogue integrated circuits, in particular to design of a switching power supply soft start circuit for a bipolar error amplifier. The switching power supply soft start circuit for the bipolar error amplifier comprises a reference voltage switching circuit and an error amplifier biasing circuit, and stable switching from beginning to end of a soft start process is achieved according to a clamping feedback principle. The switching power supply soft start circuit for the bipolar error amplifier has the advantages that generalizability is achieved, the input requirements of the bipolar error amplifier and the input requirements of an MOS type error amplifier can be met at the same time, glitch voltages cannot be generated in a power-on process in the switching power supply soft start circuit for the bipolar error amplifier, smooth transition can be achieved, and therefore the stability and the reliability of a system can be improved.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits, in particular to the design of a switching power supply soft start circuit suitable for bipolar error amplifiers. Background technique [0002] The soft start circuit is a commonly used integrated circuit module in analog integrated circuit design. It is mainly used in switching power supply chips. When the chip is powered on, the switch tube will be turned on for a long time or have a relatively large spike voltage due to the large difference between the output sampling voltage and the reference voltage, which will damage the switch tube and cause Cause irreversible damage to the system. The function of the soft-start circuit is to limit the duty cycle of the power tube drive voltage when it is powered on, so that the output voltage rises smoothly, so as to ensure that the chip can work normally during the power-on process and improve the stability of the chip. and reliabilit...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 周泽坤董渊赵倬毅柯普仁石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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