Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1977-09-15
1979-07-10
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
307252M, 323 22SC, 361100, 363 54, 363124, 363138, H02H 328
Patent
active
041610105
ABSTRACT:
A commutation sensor circuit for a DC-to-DC silicon controlled rectifier (SCR) chopper circuit to protect against commutation failure by determining the commutation capability of the chopper. This determination is made by testing two conditions, first, the applied voltage is measured and used to predict the commutation voltage available after a main SCR has been gated on and a commutating capacitor charged, and second, the available commutation voltage is measured after the main SCR has been gated on and the commutating capacitor charged. The first test allows the chopper to turn on if the predicted voltage when compared to the current flowing is sufficient to commutate the chopper. The second test initiates a commutation if the current flowing in the chopper reaches the maximum commutating ability of the chopper.
REFERENCES:
patent: 3555399 (1971-01-01), Buchanan et al.
patent: 3629615 (1971-12-01), Gurwicz
patent: 3659119 (1972-04-01), Kasama et al.
patent: 3821630 (1974-06-01), Kornrumpf et al.
Mann Stanley L.
Rettig Charles E.
Ellingsberg Donald J.
Litton Industrial Products Inc.
Salce Patrick R.
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