Switching power source apparatus

Details Switching power source apparatus Switching power source apparatus

2007-11-06

2007-11-06

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021030

Reexamination Certificate

active

11549850

ABSTRACT:
A switching power source apparatus has a switching element being connected with a DC power source through a primary winding of a transformer in which parasitic capacitance exists between terminals of the switching element. A voltage V4of free oscillation appears at a gate of the switching element after a flyback period due to the parasitic capacitance. Based on the free oscillation voltage, the switching power source apparatus detects timing synchronized with a period of the free oscillation, outputs a trigger signal V10based on the detected timing, uses the trigger signal to estimate bottom timing when the free oscillation reaches a bottom level the second time, outputs an ON start signal V9synchronized with the bottom timing, uses the ON start signal to output an ON control signal to turn on the switching element, and drives the switching element in response to the ON control signal.

REFERENCES:
patent: 4616300 (1986-10-01), Santelmann, Jr.
patent: 5497311 (1996-03-01), Hanawaka
patent: 6166926 (2000-12-01), Nath et al.
patent: 6366476 (2002-04-01), Yasumura
patent: 6788556 (2004-09-01), Hosotani et al.
patent: 7035119 (2006-04-01), Koike
patent: 7212415 (2007-05-01), Osaka
patent: 8-289543 (1996-11-01), None
U.S. Appl. No. 11/528,542, filed Sep. 28, 2006, Nakamura.

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