Overcurrent protection circuit for switching power supply

Details Overcurrent protection circuit for switching power supply Overcurrent protection circuit for switching power supply

2007-01-09

2007-01-09

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093100, C361S093500, C361S100000

Reexamination Certificate

active

10819983

ABSTRACT:
In an overcurrent protection circuit for a switching power supply having multiple voltage supply sections, an overcurrent in a low voltage supply section is detected to make it possible to take a countermeasure against overload in a transformer winding, using a simple and low cost circuit design. The circuit comprises: a current detection resistor33to detect a current in secondary side of the transformer; transistors53and52to be turned on by the current detection; a photocoupler50to be turned on and off by the transistors; and a switching power supply controller7to control on-duty of a power MOSFET6for removing the overcurrent. The current detection resistor33is provided in the line of a secondary winding30so as to be able to individually limit a current flowing through the secondary winding30.

REFERENCES:
patent: 5297014 (1994-03-01), Saito et al.
patent: 63-217973 (1988-09-01), None
patent: 5-50995 (1993-07-01), None
patent: 05-211715 (1993-08-01), None
patent: 2000-156972 (2000-06-01), None
patent: 2000-322133 (2000-11-01), None
patent: 2001-268909 (2001-09-01), None

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