Output voltage sampling method and system for flyback converter based on primary feedback

A flyback converter and output voltage technology, applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the problems of poor sampling accuracy and complex implementation, and achieve low sampling cost effect

Inactive Publication Date: 2014-10-08
SOUTHEAST UNIV
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Problems solved by technology

This sampling method requires a sample-and-hold circuit, which is more complicated to implement, and the sampled voltage is not exactly equal to the output voltage, and there is an error between the sampled voltage and the output voltage, and this error varies with the load conditions and other parameters of the system. while changing, the sampling accuracy is poor

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  • Output voltage sampling method and system for flyback converter based on primary feedback
  • Output voltage sampling method and system for flyback converter based on primary feedback
  • Output voltage sampling method and system for flyback converter based on primary feedback

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Embodiment Construction

[0032] In order to specifically describe the present invention, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as image 3, the present invention is based on the sampling system of the output voltage sampling method design of the flyback converter of the primary side feedback, including a voltage sampling module, a digital PI module and a digital PWM module, and the voltage sampling module samples the voltage information V on the auxiliary winding of this switching cycle AUX After that, the output voltage feedback digital quantity V of this switching cycle is obtained FB Output to the digital PI unit, the digital PI unit generates a duty ratio signal d according to the output voltage feedback, and outputs it to the digital PWM unit, and the digital PWM generates a switch tube control signal V according to the duty ratio signal d G Output to the gate of the switching tube Q1 in the fl...

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Abstract

The invention discloses an output voltage sampling method and system for a flyback converter based on primary feedback. Through voltage information of an auxiliary winding, the output voltage feedback quantity of the current period is adjusted according to the output voltage feedback quantity of a previous switching period of the flyback converter and the voltage information of the auxiliary winding of the current switching period, and thus the output voltage can be accurately sampled. The sampled output voltage feedback quantity is used for generating a switching signal for controlling a switching tube to work, and thus constant-voltage output of the flyback converter can be achieved. An additional sampling hold circuit is not needed, modularization and integration are easy to achieve, and sampling cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of isolated power converters, in particular to an output voltage sampling method of a flyback converter based on primary side feedback and a system thereof. Background technique [0002] With the rapid development of portable electronic equipment, isolated power converters have been developed rapidly. Among them, due to the advantages of high efficiency, simple structure, and low cost, the flyback converter occupies a major position in the power adapter and charger market. [0003] The traditional isolated power converter directly samples the output voltage of the secondary winding, and its structural block diagram is shown in figure 1 shown. Although this sampling scheme can directly obtain the output voltage, in order to isolate the input and output, an optocoupler element is required, and the optocoupler element is generally large in size, and its accuracy is greatly affected by external environmental f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 孙伟锋袁冬冬张晓明王冲徐申陆生礼时龙兴
Owner SOUTHEAST UNIV
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