Switching control circuit and self-excited DC-DC converter

Details Switching control circuit and self-excited DC-DC converter Switching control circuit and self-excited DC-DC converter

2006-06-23

2008-05-27

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C323S287000

Reexamination Certificate

active

07379284

ABSTRACT:
A self-excited DC-DC converter comprises a switching element that chops a direct-current input voltage; a smoothing circuit that smoothes the chopped voltage to generate a DC output voltage; a switching control signal generation circuit that generates a switching control signal for the on/off control of the switching element by comparing a feedback voltage of the output voltage and a comparison voltage; an output correction circuit that adjusts the comparison voltage according to an error between the feedback voltage and the reference voltage and, when the output current is in the overcurrent state, reduces the level of the comparison voltage; an overcurrent protection signal generation circuit that, when the output current is in an overcurrent state, generates an overcurrent protection signal for turning off the switching element regardless of the switching control signal; and a delay circuit that delays the overcurrent protection signal. Also, a switching control circuit is provided therein.

REFERENCES:
patent: 5966003 (1999-10-01), Takimoto et al.
patent: 5994885 (1999-11-01), Wilcox et al.
patent: 6147478 (2000-11-01), Skelton et al.
patent: 2005/0116695 (2005-06-01), Morioka
patent: 07-245874 (1995-09-01), None
patent: 2005-110369 (2005-04-01), None

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