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Power converter controller

A technology of power converter and controller, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, control/regulation system, etc., which can solve power consumption, occupy printed circuit boards, and increase space for power converters manufacturing cost etc.

Active Publication Date: 2006-05-24
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current detection circuit at the output will cause power consumption, especially when the output current is higher
In addition, the control circuit at the output terminal will occupy the space of the printed circuit board (Print Circuit Board, PCB) and increase the manufacturing cost of the power converter.

Method used

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Embodiment approach

[0086] In order to enable your examiner to have a further understanding and understanding of the structural features and the achieved effects of the present invention, I would like to provide a diagram of a better embodiment and a detailed description, as follows:

[0087] see figure 1 , is a circuit diagram of a resonant power converter according to an embodiment of the present invention. The resonant power converter of the present invention comprises a transformer 10 provided with an auxiliary winding N A , one primary side winding N P And a secondary side winding N S ; A controller 70, which generates a switching signal V PWM And a power transistor 20 is used to switch the transformer 10 to adjust the output voltage V of the power converter O with output current I O . Please also refer to figure 2 , is a waveform diagram of the resonant power converter of the embodiment of the present invention. When switching signal V PWM When it is at a high level, it will drive...

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Abstract

Detecting and controlling the switching current of the power converter, the controller controls output current. The controller includes a first circuit, a second circuit, a third circuit and a switching circuit. Based on switching current of the power converter, the first power converter generates a first signal. The second circuit detects discharge time of transformer. Based on integral carried out by discharge time on the first signal, the third circuit generates a third signal. Time constant of the third circuit is changeable, and related to the switching period of the switching signal. Thus, the third signal is proportioned to the output current. Receiving the third signal and based on a reference voltage, the switching circuit controls the pulse wave width of the switching signal so as to adjust output current of the power converter.

Description

Technical field: [0001] The present invention relates to a power converter, in particular to a controller of a resonant power converter, which controls the output current of the resonant power converter. Background technique: [0002] According to the present, various power converters are widely used to provide regulated voltage and current. In order to control the output current accurately, the current power converter is equipped with a current detection circuit and a control circuit at the output end. However, the current detection circuit at the output will cause power consumption, especially when the output current is higher. In addition, the control circuit at the output terminal will occupy space on a printed circuit board (Print Circuit Board, PCB) and increase the manufacturing cost of the power converter. [0003] Therefore, based on the above problems, the present invention provides a control circuit, which is combined with a switching circuit of a power converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335
Inventor 杨大勇
Owner SYST GEN