Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2007-04-24

2007-04-24

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S019000

Reexamination Certificate

active

11526966

ABSTRACT:
A switching power supply circuit includes a switching element, a converter transformer, a secondary-side rectifying and smoothing circuit, a switching element control unit, a choke coil, a primary-side series resonant circuit, a primary-side parallel resonant circuit, and a series circuit. The switching element implements switching for a direct-current (DC) voltage to convert the voltage into an alternating-current (AC) voltage. The choke coil is supplied with the voltage and is connected to one winding end of the primary winding and one terminal of the switching element. The primary-side series resonant circuit connects a primary-side series resonant capacitor, having a resonant frequency dominated by a leakage inductance. The primary-side parallel resonant circuit connects a primary-side parallel resonant capacitor in parallel to the switching element, having a resonant frequency. The series circuit is formed of a clamp capacitor and an auxiliary switch element which conducts in a non-conducting period of the switching element.

REFERENCES:
patent: 5805432 (1998-09-01), Zaitsu et al.
patent: 6061252 (2000-05-01), Hosotani
patent: 7054167 (2006-05-01), Yasumura
patent: 7095629 (2006-08-01), Yasumura
patent: 7145785 (2006-12-01), Yasumura
patent: 2000-134925 (2000-05-01), None

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