Switching power supply

Details Switching power supply Switching power supply

1979-09-12

1980-11-11

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

323 17, 323DIG1, 363 20, 363 49, G05F 158

Patent

active

042335574

ABSTRACT:
A switching power supply includes a two input NAND gate one input of which is coupled to a differentiated fixed frequency signal. The output of the NAND gate is coupled to an output switching device which drives a transformer. The output voltage appearing across the secondary winding of the transformer is compared with a reference voltage in a comparator which drives a light emitting diode. The light emitting diode is optically coupled to a pulse width modulator circuit for varying the width of pulses applied to the first input of the NAND gate. The circuit also includes soft start and over-current protection features.

REFERENCES:
patent: 4025843 (1977-05-01), Parker
patent: 4028596 (1977-06-01), Weber
patent: 4180852 (1979-12-01), Kolzumi et al.

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