Electrical circuit for reducing switching losses in a...

Details Electrical circuit for reducing switching losses in a... Electrical circuit for reducing switching losses in a...

2006-12-12

2006-12-12

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S282000

Reexamination Certificate

active

07148662

ABSTRACT:
A switching power supply circuit which is capable of reducing switching losses which occur when a switching element goes into the on state from the off state or goes into the off state from the on state. Switching elements are alternately actuated to on and off with dead times during which period both the switching elements are off. When one of the switching elements goes into the on state from the off state, a diode that is coupled in parallel with the switching element goes into the on state due to the energy released from a choking coil. Consequently, the switching element is switched on at a voltage of 0V (zero volts). Thus, switching losses can be reduced. Besides, when the switching element goes into the off state from the on state, the voltage rises moderately across the switching element as compared to the current passing through the switching element because of a capacitor that is coupled in parallel with the switching element. Thus, switching losses can be reduced. The same is true in the case of the other switching element.

REFERENCES:
patent: 4999568 (1991-03-01), Gulczynski
patent: 5844399 (1998-12-01), Stuart
patent: 6198260 (2001-03-01), Wittenbreder
patent: 6-311738 (1994-11-01), None
patent: 2001-197740 (2001-07-01), None
patent: 2002-112544 (2002-04-01), None
patent: 2002-153048 (2002-05-01), None
patent: 2002-262570 (2002-09-01), None

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