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Primary only control quasi resonant convertor

一种变换器、谐振电容器的技术，应用在仅初级受控的准谐振变换器领域，能够解决增加电源100生产成本等问题

Active Publication Date: 2010-09-22
FLEXTRONICS AP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optocoupler 108 and voltage reference and error amplifier 109 add to the production cost of power supply 100

Method used

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  • Primary only control quasi resonant convertor
  • Primary only control quasi resonant convertor
  • Primary only control quasi resonant convertor

Examples

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Embodiment Construction

[0020] In the following description, numerous details and alternatives are given for purposes of explanation. However, it will be understood by those of ordinary skill in the art that the present invention may be practiced without the use of these specific details. In other instances, well-known structures and devices are shown in block diagrams in order not to obscure the description of the present invention with unnecessary detail.

[0021] go to figure 2 , shows a functional block diagram of the power supply device 20 according to the present invention. Device 20 generally includes a power converter 22 coupled to a transformer 24 coupled to an output rectifier 26 . Output rectifier 26 is coupled with output capacitor 32 . Power converter 22 and transformer 24 include resonant circuit 27 coupled therebetween. A virtual feedback loop 23 is coupled between power converter 22 and output capacitor 32 .

[0022] Power converter 22 is configured to receive an unregulated DC ...

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PUM

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Abstract

A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and secondary each include a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. A current feedback circuit is coupled between the primary and the controller. A virtual output current feedback loop uses the reflection voltage signal to adjust the output current.

Description

[0001] related application [0002] This patent application claims priority under 35 U.S.C. 119(e) to co-pending U.S. Provisional Patent Application No. 60 / 921,220, filed March 29, 2007, and entitled "PRIMARY ONLY CONSTANT VOLTAGE / CONSTANTCURRENT (CVCC) CONTROL IN QUASI RESONANT CONVERTOR", which is hereby incorporated by reference. technical field [0003] The invention relates to the field of power supplies. More specifically, the present invention relates to quasi-resonant converters in which only the primary is controlled. Background technique [0004] In many applications, a voltage regulator is required to provide a voltage within a predetermined range. Some circuits will exhibit indeterminate and undesired operation and even irreparable damage if the input power is outside a specified range. [0005] A functional block diagram of a prior art power supply device 10 is shown in FIG. 1 . The device 10 generally includes a power converter 12 coupled to a transformer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/44
CPCH02M3/33569Y02B70/1433H02M3/33523Y02B70/10H02M3/33571H02M3/33573H02M3/01
Inventor M·特勒福斯F·B·罗奥帕瓦尔
Owner FLEXTRONICS AP LLC