Modulation circuit for DC-DC converter with R-C oscillator

Details Modulation circuit for DC-DC converter with R-C oscillator Modulation circuit for DC-DC converter with R-C oscillator

1984-11-14

1986-12-09

Salce, Patrick R.

Electric power conversion systems

Current conversion

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

323288, H02M 3335

Patent

active

046284281

ABSTRACT:
A switched mode power supply in which the power switch (TR1) is modulated by a resistance-capacitance oscillator (COM, R1-R5, CT). During each on-period of the switch (TR1) a secondary winding (WS) of a sense transformer (TX2) develops a unipolar sense voltage which is applied to a capacitor (CT) in the oscillator while it is charging, so as to vary the charging time and hence the on-period, the off-period of the switch (TR1) being constant.

REFERENCES:
patent: 4124884 (1978-11-01), Episcopo
patent: 4135233 (1979-01-01), Seiersen
patent: 4504776 (1985-03-01), Haville

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