Power supply

Details Power supply Power supply

1989-08-02

1990-06-12

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 50, 323902, H02M 3335

Patent

active

049338250

ABSTRACT:
To reduce the cost of insulation in a high-voltage power supply capable of constant current or constant power operation, the power supply includes an optical self-powered feedback circuit from its high-voltage section to the low-voltage section to control the output of the power supply. The feedback circuit includes within the high-voltage section of the power supply: (1) a sensing circuit for obtaining an amplitude modulated signal related to current flowing through at least certain output terminals; (2) a voltage-to-frequency converter for converting the amplitude modulated signal to a frequency modulated signal; (3) a pulse shaper for generating pulses having a duration of less than 3 microseconds to reduce power consumption; and (4) a light emitting diode. Light from the diode is transmitted to a low-voltage section where it is utilized in the feedback network. The high-voltage feedback circuitry utilizes less than 75 microamps.

REFERENCES:
patent: 4264950 (1981-04-01), Bockhorst et al.
patent: 4428017 (1984-01-01), Vaerewyck et al.
patent: 4631655 (1986-12-01), van Husen
patent: 4673864 (1987-06-01), Dessen et al.
patent: 4688161 (1987-08-01), Covington

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