Isolated switching power source

Details Isolated switching power source Isolated switching power source

1995-02-28

1996-05-07

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 323902, H02M 3335

Patent

active

055152635

ABSTRACT:
An object of the present invention is to reduce a cost and a power consumption, eliminating a voltage source for generating a reference voltage in an isolated switching power source achieving a feedback from an output side of the power source to a control circuit in an input side of the power source through a photo-coupler. A voltage V.sub.1 obtained by dividing an output voltage V.sub.0 by a voltage dividing resistors 8, 9 is applied to a base of a transistor 11-1 for an error amplifier, and a photo-coupler light emitting element 10-1 is connected between an emitter of the transistor 11-1 and a negative side of an power source output. A forward dropping voltage of the photo-coupler light emitting element becomes approximately constant (approximately 1.1 v) over a variation range of a current flowing to the photo-coupler light emitting element at actually using time. Utilizing such a characteristic, it is possible to cause the photo-coupler 10-1 to have a function generating the reference voltage to be compared with the output voltage V.sub.0 as well as a function achieving a feedback to the control circuit 5 in the input side of the power source.

REFERENCES:
patent: 4378585 (1983-03-01), Bete
patent: 4761724 (1988-08-01), Brown et al.
patent: 5408402 (1995-04-01), Nonnemacher
patent: 5420498 (1995-05-01), Kramer

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