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Switching controller for resonant power converter

A technology for power converters and controllers, which is used in high-efficiency power electronic conversion, control/regulation systems, output power conversion devices, etc., can solve the problems of low audio disturbance attenuation rate, intermittent switching noise, etc.

Active Publication Date: 2008-06-25
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Power resonators also have the disadvantages of low audio disturbance attenuation rate and intermittent switching noise

Method used

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  • Switching controller for resonant power converter
  • Switching controller for resonant power converter
  • Switching controller for resonant power converter

Examples

Experimental program
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Embodiment Construction

[0103] FIG. 1 is a schematic diagram of a resonant power converter according to an embodiment of the present invention. The resonant power converter includes a switching controller 100 for controlling power switches 10 and 20 . The power switch 10 is coupled to the input voltage VIN of the aforementioned power converter. The power switch 20 is grounded. The power switches 10 and 20 form a half-bridge circuit to control the primary winding N of the transformer 50 via a series resonant circuit. P on and off. The resonant circuit includes an inductor 30 and a capacitor 40 . The maximum power will be at the frequency f of the resonant circuit at the switching frequency of the power switches 10 and 20 0 , is transmitted to the secondary winding N of the transformer 50 S1 with N S2 on, among them,

[0104] f 0 = 1 2 n L 30 ...

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Abstract

The present invention provides a switching controller for a resonant power converter, which includes: a feedback circuit coupled to a feedback terminal, which is used to receive a feedback signal and generate an adjustment signal according to the feedback signal; a feedback circuit coupled to the minimum frequency setting terminal. a minimum frequency setting circuit, which is used to generate a first current signal to determine the minimum switching frequency of the power converter; a maximum frequency setting circuit coupled to the maximum frequency setting terminal, which is used to generate a second current signal according to the aforementioned adjustment signal, so as to Determining the maximum switching frequency of the power converter; and an oscillation circuit configured to generate an oscillation signal according to the first current signal and the second current signal, wherein the oscillation signal can determine the switching frequency of the power converter.

Description

technical field [0001] The invention relates to a resonant power converter, in particular to a control circuit of the resonant power converter. Background technique [0002] Power converters are often used to convert irregular power to regular power. A power converter typically includes a transformer having primary and secondary windings that are insulated from each other. A switching device is coupled to the primary winding for controlling the transfer of electrical energy from the primary winding to the secondary winding. The power converter operates in a high frequency environment, and its size and weight can be reduced. However, power converters suffer from switching losses, component stress, and electromagnetic interference (EMI). In recent years, some power converters for converting high-frequency power with reduced switching loss have been developed. Among them, US Patent 4,535,399 "Regulated switched power circuit with resonant load" proposed by Tamas S. Szepesi ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5383H02M3/338H02M7/00
CPCH02M3/3376Y02B70/1433H02M3/33523Y02B70/10
Inventor 杨大勇林乾元石光志王伟庭
Owner SYST GEN