Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1993-06-14
1994-11-15
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
H02M 710
Patent
active
053654200
ABSTRACT:
A dynamically self-calibrating, intrinsically safe DC--DC power supply generates a controlled output voltage during normal operation and limits the output voltage and current during fault conditions, such as applied overvoltages or short circuits within the supply. The supply has a voltage regulator for generating a controlled output voltage in response to a feedback voltage applied to a control terminal. The supply also has a voltage-clamping Zener barrier, which includes (i) a power Zener diode connected between the output and control terminals of the regulator for supplying the feedback voltage thereto, which is reverse-biased during normal operation of the supply, and (ii) a non-linear, low impedance path between the control terminal and ground in parallel with a resistor. The feedback voltage causes substantially constant current to flow through the diode during normal operation, thereby dynamically compensating for any variation in breakdown voltage of that Zener diode. By operating normally with minimal current through the diode, the supply's output power can be optimized without compromising the intrinsically safe operation of the supply.
REFERENCES:
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patent: 4423369 (1983-12-01), Alaspa et al.
patent: 4708022 (1987-11-01), Johnson
patent: 4992723 (1991-02-01), Zylstra et al.
patent: 5136630 (1992-08-01), Breneman
patent: 5144517 (1992-09-01), Wieth
Nguyen Matthew
Scully Signal Company
Stephan Steven L.
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