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AC-DC (Alternating Current-Direct Current) power converter and loop compensating circuit thereof

A technology for power converters and loop compensation, which is applied to output power conversion devices, electrical components, and AC power input to DC power output. It can solve problems affecting the accuracy of output voltage, improve stability, and reduce DC power. The effect of voltage influence

Inactive Publication Date: 2012-05-09
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the noise is sensitive to higher gain, in order to keep the noise as small as possible, it is necessary to limit the compensation circuit to not generate a large gain, thus affecting the accuracy of the output voltage

Method used

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  • AC-DC (Alternating Current-Direct Current) power converter and loop compensating circuit thereof
  • AC-DC (Alternating Current-Direct Current) power converter and loop compensating circuit thereof
  • AC-DC (Alternating Current-Direct Current) power converter and loop compensating circuit thereof

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Embodiment Construction

[0057] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] refer to figure 2 , which shows a schematic structural diagram of a loop compensation circuit of an AC-DC power converter according to the present invention, including:

[0059] The feedback filter unit 201 is configured to filter the feedback voltage Vfb to obtain a feedback filter voltage Vfbi; wherein, the feedback voltage Vfb is obtained by periodic sampling through the auxiliary stage voltage division signal Vf of the AC-DC power converter;

[0060] An error amplification unit 202, configured to amplify the difference between the feedback filter voltage Vfbi and the reference voltage Vref to obtain an error voltage Veao;

[0061] a voltage-current conversion unit 203, configured to convert the error voltage Veao into...

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Abstract

The invention provides an AC-DC (Alternating Current-Direct Current) power converter and a loop compensating circuit thereof; the loop compensating circuit comprises a feedback filtering unit, an error amplifying unit, a voltage current conversion unit and a pulse width modulation unit, wherein the feedback filtering unit is used for filtering a feedback voltage to obtain a filtered feedback voltage, and the feedback voltage is obtained through the periodical sampling of auxiliary partial pressure signals of the AC-DC power converter; the error amplifying unit is used for amplifying a difference value between the filtered feedback voltage and a reference voltage to obtain an error voltage; the voltage current conversion unit is used for converting the error voltage into an injection current; and the pulse width modulation unit is used for receiving the injection current and comparing the filtered feedback voltage and a sawtooth signal to obtain a pulse width modulation signal. By adopting the AC-DC power converter, the noise interference can be reduced as much as possible, and simultaneously the higher loop gain is obtained.

Description

technical field [0001] The invention relates to the technical field of circuit control, in particular to an AC-DC power converter and a loop compensation circuit of the AC-DC power converter. Background technique [0002] The AC-DC power converter is used to transform AC power into DC power through a transformer, and the transformer includes a primary side coil and a secondary side coil, wherein the AC power is input to the primary side, and the secondary side outputs DC power. The AC-DC conversion circuit includes a power switch, and the power switch controls the turn-on and turn-off of the primary side at a certain switching frequency. Further, the voltage division signal of the auxiliary stage is proportional to the DC voltage output by the secondary side, and the voltage division signal is obtained by the sampling circuit to obtain a feedback signal and input to the loop compensation circuit of the primary side, and the loop compensation circuit outputs a voltage with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/44
Inventor 王钊
Owner VIMICRO CORP
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