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Switch power supply and feedforward compensation circuit

A switching power supply, feed-forward compensation technology, applied in electrical components, regulating electrical variables, output power conversion devices, etc., can solve problems such as large compensation amount, and achieve the effect of ensuring current

Active Publication Date: 2018-07-10
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, in order to ensure that the switching power supply can output a constant current, the current compensation method is used to control the power switch tube, but the current compensation method can only meet the compensation under full load conditions, and the compensation amount is too large for light load and no load

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  • Switch power supply and feedforward compensation circuit
  • Switch power supply and feedforward compensation circuit
  • Switch power supply and feedforward compensation circuit

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] A feedforward compensation circuit for a switching power supply according to an embodiment of the present invention and a switching power supply having the circuit are described below with reference to the accompanying drawings.

[0026] figure 1 is a circuit diagram of a switching power supply according to an embodiment of the present invention. like figure 1 As shown, the switching power supply may include a rectification and filtering circuit, a constant current circuit and a control chip IC.

[0027] Specifically, t...

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PUM

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Abstract

The invention discloses a switch power supply and a feedforward compensation circuit. The feedforward compensation circuit comprises a negative voltage identification module, a current mirror image module and a current superposition module, wherein the negative voltage identification module is used for carrying out negative voltage identification on the voltage of the feedback base pin of the switch power supply according to the secondary degaussing time of the switch power supply so as to obtain a feedback current corresponding to the primary input line voltage of the switch power supply; thecurrent mirror image module is used for generating a compensation current through a current mirror image according to the feedback current, and limiting the compensation current according to the conduction time of a power switch tube in the switch power supply so as to acquire the limited compensation current; and the current superposition module is used for superposing the limited compensation current to the over-current detection base pin of the switch power supply so as to carry out feedforward compensation on the current of the power switch tube. Regardless of whether the switch power supply is in a light load state or a heavy load state, an appropriate current compensation amount can be acquired, and the switch power supply is guaranteed to output a constant current.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a feedforward compensation circuit of a switching power supply and a switching power supply with the circuit. Background technique [0002] Switching power supply is a power supply that uses modern power electronics technology to maintain a stable output by controlling the on-off time ratio of the power switch tube. Switching power supply can realize constant current and constant voltage function. [0003] Usually, in order to ensure that the switching power supply can output a constant current, the current compensation method is used to control the power switch tube, but the current compensation method can only meet the compensation under full load conditions, and the compensation amount is too large for light load and no load . Contents of the invention [0004] The present invention aims to solve one of the technical problems in the related art at least to a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33507H02M1/0016
Inventor 吴克柔王文情
Owner BYD SEMICON CO LTD