Circuit and control method

A circuit and conversion circuit technology, applied in the control/regulation system, electrical components, regulating electrical variables, etc., can solve the problems of complex peripheral circuits of the isolation conversion circuit, and achieve the effect of reducing costs

Active Publication Date: 2014-07-16
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this isolation conversion circuit 50 needs an auxiliary winding to feed back the output voltage, which makes the peripheral circuit of the isolation conversion circuit still complicated

Method used

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  • Circuit and control method
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Embodiment Construction

[0048] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are for illustration only, and are not intended to limit the present invention. Based on the specification description and the consideration of easy reading, the terms appearing in the patent application documents of the present invention are defined one by one as follows: The isolated conversion circuit in the present invention includes a DC-DC flyback converter, an AC-DC flyback converter or other types the converter. It should be noted that the above terms are only used to refer to one of the names they mean, so any names that mean the same or similar names should be regarded as their equivalents.

[0049] Such as image 3 , is the isolation conversion circuit 100 according to the present invention. This embodiment is used in AC-DC conversion circuit. However, those skilled in the art should realize that the isolation conversion ...

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Abstract

The invention discloses a circuit and a control method, which are used for isolation conversion of primary side control. The isolation conversion circuit of the present invention does not need an auxiliary winding to provide a feedback signal, and its feedback circuit is coupled to the primary winding of the transformer; its control circuit provides a switching signal based on the feedback signal and the current signal flowing through the main switch to control the main switch. On and off, and then control the output of the isolation conversion circuit. The isolated conversion circuit and method thereof based on the present invention do not need an auxiliary winding, and the control of the output terminal is realized through the feedback of the primary side, thereby simplifying the peripheral circuit.

Description

technical field [0001] The present invention relates to an isolation conversion circuit, more specifically, the present invention relates to a primary-side controlled isolation conversion circuit. Background technique [0002] With the development of electronic technology and the improvement of environmental protection requirements, efficiency and stability have become crucial design factors for voltage converters. [0003] The isolated voltage converter can be used in adapters and chargers with high safety requirements. It includes primary side circuits and secondary side circuits, which are isolated by transformers. In the application, the working process includes a constant current charging control process and a constant voltage control process, the relationship between output voltage and output current see figure 1 . In section B, the load is charged, when the output voltage V O less than the output voltage threshold V th When , the converter keeps the output current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/156
Inventor 李恩张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST
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