Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-11-28
1999-01-19
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, H02M 3335, H02M 7122
Patent
active
058620443
ABSTRACT:
A switching power supply apparatus wherein a main converter turns "on" and "off" a DC current applied to a primary winding of a main transformer using a main switching element and outputs a main output voltage to the secondary side after rectifying and smoothing current induced in a secondary winding; an error amplifier generates an error voltage between the main output voltage and a first reference voltage; a PWM control circuit outputs an on-off control signal for the main switching element so that the error voltage is minimized; a photo coupler receives the error voltage and provides an output to the PWM control circuit; an over-voltage protection circuit generates an over-voltage protection signal when the main output voltage exceeds a second reference voltage; an on-off circuit outputs either a high level potential or a common level potential depending on whether the power is to be turned "on" or "off"; a shut down latch circuit outputs a shut down signal when the over-voltage protection signal represents an over-voltage state; and a shut down implementation circuit holds the input voltage to the photo-coupler at a value which suppresses input to the photo-coupler when a signal from the on-off circuit specifies power off or when the shut down signal from the shut down latch circuit is effective; whereby only a single isolator is required in the apparatus.
REFERENCES:
patent: 4228493 (1980-10-01), De Sartre et al.
patent: 4849869 (1989-07-01), Tanuma et al.
patent: 5414611 (1995-05-01), Muto et al.
patent: 5581451 (1996-12-01), Ochiai
patent: 5675485 (1997-10-01), Seong
Matsumura Hideaki
Ooe Takumi
Shioya Masaki
Kojima Moonray
Nguyen Matthew
Yokogawa Electric Corporation
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