Switching power source circuit capable of turning off an...

Details Switching power source circuit capable of turning off an... Switching power source circuit capable of turning off an...

2006-03-14

2006-03-14

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07012412

ABSTRACT:
A pulse width control circuit provided in a drive circuit instructs an OFF drive circuit to operate for a period shorter than an inactive period of a drive control signal. Thus, when the drive control signal is inactive, the OFF drive circuit begins operating, and draws a current from a base of a switching element, thereby turning OFF the switching element. Further, the OFF drive circuit stops operating before the drive control signal becomes active.

REFERENCES:
patent: 4309650 (1982-01-01), Boros et al.
patent: 5617016 (1997-04-01), Borghi et al.
patent: 7-288974 (1995-10-01), None
patent: 8-214541 (1996-08-01), None

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