Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1994-06-13
1995-10-10
Stephan, Steven L.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 89, H02M 7217
Patent
active
054576245
ABSTRACT:
A method and apparatus are disclosed for sustaining efficiency of switched mode power converters over wide load ranges. The method and apparatus can be used with any switched mode power converter having at least one synchronous rectifier (Q.sub.2) capable of being enabled or disabled and coupled, either by direct connection or otherwise, to an inductor (L.sub.1) and a diode rectifier (D.sub.1), to provide a current path for the inductor current when the synchronous rectifier (Q.sub.2) is disabled. The power converter is initialized by enabling the synchronous rectifier (Q.sub.2). Occasionally, the synchronous rectifier (Q.sub.2) is disabled, and the energy stored in the inductor (L.sub.1) is detected by sensing a voltage representative of the energy stored in the inductor (L.sub.1). A power level signal is then generated indicating whether the power converter is operating above a selected threshold. The power converter is configured in response to the power level signal by enabling the synchronous rectifier (Q.sub.2) if the power level is above the threshold or by disabling the synchronous rectifier (Q.sub.2) otherwise. The steps of disabling, detecting, generating, and configuring are repeated.
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Brady III W. James
Courtney Mark E.
Donaldson Richard L.
Nguyen Matthew V.
Stephan Steven L.
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