Electric power conversion systems – Current conversion – With starting arrangement
Patent
1992-06-02
1993-11-23
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
With starting arrangement
363 98, 363132, H02M 7517
Patent
active
052650014
ABSTRACT:
A power supply circuit securing a stabilized output DC voltage despite increases in the input DC voltage, uses an economical electromagnetic relay, in which a control current Ic' is supplied from a switching amplifier 1 to a control winding Nc' of a saturable ferrite transformer (CDT'). A class A amplifier formed of resistors R.sub.1 to R.sub.3 and a transistor Q.sub.8 of the switching amplifier 1 amplifies a DC input voltage E1 and controls the switching frequency ranging from 100 to 200 KHz according to input DC voltage ranging from 10 to 32V. Resistors R.sub.4 and R.sub.5 and a transistor Q.sub.7 for the switching amplifier 1 form a switching circuit of the control current Ic', while resistors R.sub.6 and R.sub.7 and a transistor Q.sub.8 form a switching circuit for the starting currents of switching transistors Q.sub.1 and Q.sub.3 of a first and a third half-bridge resonant converter.
REFERENCES:
patent: 4047089 (1977-09-01), Suzuki et al.
patent: 4533836 (1985-08-01), Carpenter et al.
patent: 4887199 (1989-12-01), Whittle
patent: 4937728 (1990-06-01), Leonardi
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
Sterrett Jeffrey
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