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Active Clamp Flyback Power Converter with Switchable Mode of Operation

A flyback power supply and converter technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve the problems of power loss, troublesome electromagnetic interference, etc.

Active Publication Date: 2021-09-07
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under light load conditions, ACF power converters often have high power loss due to the circulating current in the main winding.
[0003] Moreover, conventional ACF power converters often suffer from electromagnetic interference (EMI) and / or audible noise in system design.

Method used

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  • Active Clamp Flyback Power Converter with Switchable Mode of Operation
  • Active Clamp Flyback Power Converter with Switchable Mode of Operation
  • Active Clamp Flyback Power Converter with Switchable Mode of Operation

Examples

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Embodiment Construction

[0013] In this specification, there are some same symbols, which represent components with the same or similar structure, function, and principle, and can be deduced by those skilled in the art based on the teaching of this specification. For the sake of brevity in the description, components with the same symbols will not be repeated.

[0014] figure 1 An ACF power converter 10 implemented according to the present invention. The bridge rectifier BD converts the AC mains V AC Rectification, providing input power line IN and input ground power line GNDI. Input voltage V IN on the input power line IN. The transformer TF includes a main winding LP, a secondary winding LS and an auxiliary winding LA, which are inductively coupled to each other. The main winding LP, the lower arm switch LSS, and the current detection resistor RCS are connected in series between the input power line IN and the input ground power line GNDI. The lower arm switch LSS and the current detection res...

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Abstract

The active clamp flyback power converter includes a lower arm switch, an upper arm switch, and a control circuit. The lower arm switch connects the main winding of the transformer to the first power line. The upper arm switch is connected in series with the capacitor to form an active clamping circuit, which is connected in parallel with the main winding. The control circuit structure provides an upper arm signal and a lower arm signal according to the compensation signal and the current detection signal, and respectively controls the upper arm switch and the lower arm switch to adjust the output voltage of the active clamp flyback power converter. The control circuit is selectively operable in one of several operating modes. The operation modes include a complementary mode, so that the upper arm signal and the lower arm signal are substantially complementary. The current detection signal can represent the inductor current flowing through the main winding. When operating in the complementary mode, the control circuit exits the complementary mode and enters a non-complementary mode according to the current detection signal.

Description

technical field [0001] The present invention generally relates to an active-clamp flyback power converter and a related control method, and especially relates to the related technology of operating mode switching of the active-clamp flyback power converter. Background technique [0002] Flyback power converters have been widely used in power supplies of many electronic products, such as home appliances, computers, battery chargers, etc., for example. In order to improve the power conversion efficiency, an active-clamp circuit is used to improve the energy loss problem of the snubber of the general flyback power converter. Generally, a flyback power converter with an active clamp circuit is called an active clamp flyback (ACF) power converter. Under heavy load conditions, ACF power converters tend to excel in power conversion performance. However, under light load conditions, the ACF power converter often has high power loss due to the circulating current in the main windin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/44H02M1/08
CPCH02M1/08H02M1/44H02M3/33523
Inventor 陈耀宗张智琦蔡孟仁
Owner LEADTREND TECH