Electricity: power supply or regulation systems – Remote sensing
Patent
1974-02-08
1976-01-06
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
178DIG11, 321 14, 323 17, 323DIG1, G05F 158
Patent
active
039315673
ABSTRACT:
In a DC power supply, a switching transistor and an inductor are connected in series between an unregulated DC supply and a DC output terminal. The output DC voltage is a function of the on to off ratio of the switching transistor. The switching period of the switching transistor is controlled by a load feedback circuit which compares the output voltage, as sensed by the voltage drop of the current through the switching transistor, with a sawtooth voltage from a synchronized oscillator. An overload detection circuit includes a diode and integrator coupled to a junction between the inductor and the switching transistor. When the switching transistor is turned off, the load current which was flowing through the switching transistor is diverted to the diode. The current through the diode is thus directly proportional to the load current. The load current is detected and causes disabling of the load feedback circuit when the load current rises above a predetermined level.
REFERENCES:
patent: 3473049 (1969-10-01), Alexander
patent: 3739274 (1973-06-01), DePuy
patent: 3745444 (1973-07-01), Calkin et al.
patent: 3781653 (1973-12-01), Marini
patent: 3818306 (1974-06-01), Marini
patent: 3818318 (1974-06-01), Schott et al.
patent: 3819986 (1974-06-01), Fukuoka
Pellinen A. D.
Warwick Electronics Inc.
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