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Feedback compensation circuit based on variable zero and switching power supply applying same

A feedback compensation and compensation voltage technology, applied in the field of switching power supply, can solve the problem of unable to adjust the phase margin adaptively, and achieve the effect of improving the phase margin and ensuring the stability

Active Publication Date: 2015-06-03
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a feedback compensation circuit based on a variable zero point and a switching power supply using it, so as to solve the technical problem that the phase margin cannot be adaptively adjusted in the prior art

Method used

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  • Feedback compensation circuit based on variable zero and switching power supply applying same
  • Feedback compensation circuit based on variable zero and switching power supply applying same
  • Feedback compensation circuit based on variable zero and switching power supply applying same

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Embodiment Construction

[0015] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0016] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, without which the description of these details can be fully understood by those skilled in the art.

[0017] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present inv...

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Abstract

The invention discloses a feedback compensation circuit based on variable zero and a switching power supply applying the feedback compensation circuit. The feedback compensation circuit comprises a first error amplifier, a second error amplifier, a compensation capacitor and a compensation resistor, wherein the first polar end of the first error amplifier and the first polar end of the second error amplifier are respectively used for receiving a first signal; the second polar end of the first error amplifier and the second polar end of the second error amplifier are respectively used for receiving a second signal; the compensation capacitor is serially connected between the output end of the first error amplifier and the output end of the second error amplifier; a compensation voltage is formed at the output end of the first error amplifier; one end of the compensation resistor is connected with the output end of the second error amplifier, and the other end of the compensation resistor is in ground connection; the first error amplifier is provided with a variable bias current source, and a direct proportion relationship is formed between the transconductance of the first error amplifier and the size of the variable bias current source. The feedback compensation circuit can adaptively adjust the zero, so that the phase margin is improved, and the stability of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a feedback compensation circuit based on a variable zero point and a switching power supply using the same. Background technique [0002] Phase margin is an important index in circuit design, mainly used to measure the stability of negative feedback system, and can be used to predict the overshoot of the step response of the closed-loop system. The phase margin can be regarded as the phase change that can be increased before the system enters an unstable state. Generally, the larger the phase margin, the more stable the system. Therefore, a more appropriate phase margin is required, and the phase margin generally needs to be greater than 45 °. [0003] In a power converter, it is often necessary to sample the output voltage and compare it with a reference signal (generally through an error amplifier) ​​to generate a feedback compensation signal. Under full-load condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
Inventor 徐孝如游步东
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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