Switching power supply

Details Switching power supply Switching power supply

1994-11-14

1996-11-12

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323224, 363127, G05F 110, G05F 1652, G05F 1613, H02M 7217

Patent

active

055743579

ABSTRACT:
A switching power supply with a high power-conversion-efficiency is obtained by further reducing a loss occurring in a transistor rectifying element. A driving transistor Q3 is arranged between a base of a transistor Q2 as the rectifying element and the ground. A driving signal is inputted from a connection point of the transistor Q2 and a choke coil L1 generating a flyback voltage to the base of the driving transistor Q3, and an ON ad OFF operation of the transistor Q2 is caused to synchronize with an ON ad OFF operation of the switching transistor Q1, thereby preventing a leakage of the current in direction of the base from the collector of the transistor Q2 when it turns off, reducing the loss of the transistor rectifying element and then, improving the power conversion efficiency of the switching power supply.

REFERENCES:
patent: 4449174 (1984-05-01), Ziesse
patent: 4546304 (1985-10-01), Schwarz
patent: 4736151 (1988-04-01), Dishner
patent: 4801859 (1989-01-01), Dishner
patent: 5461302 (1995-10-01), Garcia et al.

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