Method and apparatus for protecting against semiconductor power

Details Method and apparatus for protecting against semiconductor power Method and apparatus for protecting against semiconductor power

1986-04-16

1990-01-16

Shoop, Jr., William M.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 33, H02H 709

Patent

active

048947458

ABSTRACT:
A protection circuit for preventing an over-current condition if the semiconductor power controller in an electric train power control circuit is defective. The power controller is connected in series through first and second switches to a D.C. power source. A capacitor is also connected to the power source through the two switches and through a charging resistor connected in parallel with the second switch. When the first switch is closed, the capacitor is charged through the first switch and the resistor. After the capacitor voltage reaches a set reference voltage during a predetermined time interval, the second switch is closed to permit the power control equipment subsequently to apply power to the driving motor of the train. If the capacitor voltage does not reach the reference voltage during the predetermined time interval, then the second switch remains open and the first switch is re-opened to completely disconnect the power control equipment from the D.C. power source.

REFERENCES:
patent: 3450947 (1969-06-01), Rogers, Sr.
patent: 3708719 (1973-01-01), Ishikawa
patent: 3796918 (1974-03-01), DeForest et al.
patent: 3823342 (1974-07-01), Burr et al.
patent: 3958164 (1976-05-01), Hess
patent: 4042966 (1977-08-01), Newell et al.
patent: 4196462 (1980-04-01), Pohl
patent: 4412162 (1983-10-01), Kitamura

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