Synchronous rectifier circuit

Details Synchronous rectifier circuit Synchronous rectifier circuit

1998-12-31

2000-11-21

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

323282, 363127, H02M 700, G05F 140

Patent

active

061512338

ABSTRACT:
In a switching power circuit adopting the synchronous rectifying system, when a first switch is cut-off, current I.sub.L of an inducing element is maintained by a commutating diode, and the inducing element releases an energy which was stored in a conduction period of the first switch. A second switch connected in parallel to the commutating diode is conducted so as not to be overlapped with the conduction period of the first switch. In the conduction period of the second switch, the current I.sub.L does not flow through the commutating diode, and it is possible to prevent lowering of efficiency caused by forward voltage drop. An inducing element current detecting circuit monitors the current I.sub.L and, when the current I.sub.L is reversing its direction, instructs a control circuit to cut-off the second switch. As a result, no reverse current flows through the inducing element even when the load is small, thus realizing a switching power circuit always having high efficiency.

REFERENCES:
patent: 5072171 (1991-12-01), Eng
patent: 5341085 (1994-08-01), Ettes

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