DC Power supply circuit

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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Details

363 21, 363 97, H02M 3335

Patent

active

043274048

ABSTRACT:
A DC power supply circuit includes a blocking oscillator circuit of the transistor saturation type, an error detection circuit for detecting difference between an output voltage level and a preselected reference level, and a control circuit. At the start of the circuit operation, the blocking oscillator circuit is controlled in the self oscillation mode, and thereafter, controlled in the separate excitation mode. The control circuit responds to an output signal of the error detection circuit and functions to lengthen an ON period of a switching transistor included in the blocking oscillator circuit when the output voltage level is lower than the preselected reference level. Contrarily, when the output voltage level is higher than the preselected reference level, the ON period of the switching transistor is shortened.

REFERENCES:
patent: 3134940 (1964-05-01), Massey et al.
patent: 3523235 (1970-04-01), Schaefer
patent: 4208705 (1980-06-01), Hosoya

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