Intrinsically safe regulated power supply

Details Intrinsically safe regulated power supply Intrinsically safe regulated power supply

1978-06-22

1981-04-28

Shoop, William M.

Electric power conversion systems

Current conversion

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

363 56, 363 97, H02M 3335, H02M 118

Patent

active

042649501

ABSTRACT:
An intrinsically safe regulated power supply has an input connected to a source of power and an output connected to a voltage-limited diode. The output current is limited by having a current sensor placed in series between the output terminal of the regulator and the diode. The current sensor generates an output which is applied to a differential amplifier. The differential amplifier develops an output voltage which is proportional to the current passing through the current-sensing means. This voltage is converted to a corresponding frequency which forms pulses having a repetition rate proportional to the frequency from the voltage-to-frequency converter but having a constant width. Pulses are applied to output transistors which control the current through the primary of a transformer. An excessive output current will convert the pulses to a low repetition rate, drastically cutting the voltage which will prevent excessive current through the load. Internal failures will electrically discontinue power transmission to the secondary of the transformer.

REFERENCES:
patent: 3197691 (1965-07-01), Gilbert
patent: 3372327 (1968-03-01), Morgan
patent: 3378751 (1968-04-01), Walker
patent: 3701937 (1972-10-01), Combs
patent: 3916283 (1975-10-01), Burrows

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