Intrinsically safe power supply unit

Details Intrinsically safe power supply unit Intrinsically safe power supply unit

1990-03-02

1991-09-17

Stephan, Steven L.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 52, 363125, 361 18, 361 91, 361111, H02M 706

Patent

active

050500600

ABSTRACT:
An intrinsically safe power supply unit, more particularly for face supports in mining, comprising an ac transformer connected to a rectifier and power resistors for limiting the current and connected to the dc voltage output, wherein the ac voltage transformer is a resonance transformer which stabilizes the secondary voltage, and the dc voltage occurring behind the power resistors is kept constant by three voltage limiters connected in parallel.

REFERENCES:
patent: 3978388 (1976-08-01), de Vries
patent: 4321524 (1982-03-01), Petrovic

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