A Soft Start Circuit for Switching Power Supply Used in 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 simple structure, limited applicability, poor stability, etc., achieve smooth transition, improve stability and reliability, and be universal The effect of applicability

Inactive Publication Date: 2016-08-31
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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  • A Soft Start Circuit for Switching Power Supply Used in Bipolar Error Amplifier
  • A Soft Start Circuit for Switching Power Supply Used in Bipolar Error Amplifier
  • A Soft Start Circuit for Switching Power Supply Used in Bipolar Error Amplifier

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Embodiment Construction

[0012] The specific embodiments of the present invention will be described below in conjunction with the drawings

[0013] The existing traditional soft-start circuit uses a comparator and switch switching principles, such as figure 1 As shown, when the chip is just powered on, C SS1 Terminal potential V SS1 =0, at the same time DC current source I B11 Start to C SS1 Charge so that V SS1 The voltage gradually increases, at this time V REF1 > V SS1 , The comparator COM2 outputs high level, the switch tube MN1 is turned on, the comparator COM1 outputs low level, the switch tube MN2 is turned off, and the error amplifier turns V SS1 As the reference voltage, the duty cycle of the switching tube driving waveform is adjusted by the principle of loop feedback, so that the output voltage of the switching power supply gradually rises, when C SS1 Terminal voltage V SS1 Rise to V REF1 When the comparator COM2 is triggered, the output is turned from high to low, the switch MN1 is tu...

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Abstract

The invention relates to the technical field of analog integrated circuits, in particular to the design of a switching power supply soft-start circuit for a bipolar error amplifier. The invention includes a reference voltage switching circuit and an error amplifier bias circuit, and uses the principle of clamp feedback to realize smooth switching from the beginning to the end of the soft start process. The beneficial effect of the present invention is that it has universal applicability, can meet the input requirements of bipolar error amplifier and MOS error amplifier at the same time, and the circuit will not appear glitch voltage in the power-on process, and can realize smooth transition, thereby improving System stability and reliability. The invention is especially suitable for soft start circuits of switching power supplies.

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 a bipolar error amplifier. 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 switching tube will be turned on for a long time or a relatively large spike voltage due to the large difference between the output sampling voltage and the reference voltage, which will damage the switching tube and thus Causes irreversible damage to the system. The function of the soft-start circuit is to limit the duty cycle of the power tube driving 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 reliability....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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