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Switch power supply system with zero filling circuit

A technology of switching power supply and switching power supply chip, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., which can solve problems affecting control stability and achieve fast response and strong anti-interference ability

Inactive Publication Date: 2012-10-24
WUXI POWERSILICON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application of switching power supply chips, the load feedback resistance will vary greatly according to the needs of the application, which will affect the stability of the above control

Method used

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  • Switch power supply system with zero filling circuit
  • Switch power supply system with zero filling circuit

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Embodiment Construction

[0013] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] see figure 2 , the switching power supply system with zero padding circuit includes a switching power supply chip (shown in the dotted line box) and external circuits. The switching power supply chip includes an operational amplifier OpAmp, a comparator Comp and a gate drive Gate Drive connected in sequence, and an input terminal and an output terminal of the operational amplifier OpAmp are connected to a compensation impedance. The external circuit includes load feedback divider resistor R1, resistor R2, field effect transistor connected in series with Gate Drive, power supply for the entire switching power supply system, isolation capacitors, inductors, etc. One end of the load feedback divider resistor R1 is connected to one end of the resistor R2, the other end is connected to the output terminal of the switching power supply sys...

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Abstract

The invention discloses a switch power supply system with a zero filling circuit, which comprises a compensating resistor and a compensating capacitor, wherein the compensating resistor is connected between a voltage dividing point and the first input end of an amplifier; the compensating capacitor is connected between the output end of a switch power supply chip and the first input end of the amplifier; and a ratio of a first resistance to the resistance of the compensating resistor is at least two magnitudes smaller than a ratio of the first resistance to a second resistance. The switch power supply system has the advantages that: the obtained zero-point frequency is hardly influenced by a feedback voltage dividing resistance of the switch power supply, so that the system is stable in wider voltage range, current range and frequency range without external compensating elements, and has high response speed and high antijamming capability.

Description

technical field [0001] The invention relates to a switching power supply system, in particular to a switching power supply system capable of reducing system parameters. Background technique [0002] The current power integrated chip generally adopts the external compensation method to make the switching power supply system stable. However, external compensation needs to increase additional components and costs, and the external compensation method used by the switching power supply chip of the prior art will also be affected by changes in system parameters (such as voltage, current and switching frequency, etc.), so practical applications are subject to quite a restriction. [0003] In order to make the switching power supply system stable in a relatively wide application range, a prior art method is to use the parasitic resistance of the load capacitor to generate a zero point, but since the parasitic resistance value of the capacitor and the capacitance value itself will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/06H02M3/155
Inventor 陈俊
Owner WUXI POWERSILICON TECH