Method and apparatus for detecting a shorted SCR

Details Method and apparatus for detecting a shorted SCR Method and apparatus for detecting a shorted SCR

1985-09-27

1987-04-21

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 57Q, 324 59, 324158SC, G01R 3102

Patent

active

046599835

ABSTRACT:
The inductors in an induction heating apparatus are arranged in parallel branches with an SCR in series with each inductor and an RC snubber circuit in parallel with each inductor. If an SCR becomes shorted the faulty SCR is detected by a method and apparatus for coupling a capacitor across the inductors one at a time, exciting the capacitor-inductor circuit with a frequency suitable to induce a resonant condition provided the inductor is in series with a normal SCR and whereby resonance will not occur if the inductor is in series with a shorted SCR, and sensing circuit resonance thereby detecting whether the SCR in series with the selected inductor is shorted.

REFERENCES:
patent: 4112286 (1978-09-01), Alderman et al.
patent: 4114010 (1978-09-01), Lewis
patent: 4384248 (1983-05-01), Matsuda et al.
Blackwell et al., "Measuring Small Inductances", Wireless World, Feb. 1944, pp. 37-40.

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