Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1987-05-12
1989-03-28
Envall, Jr., Roy N.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
323239, 323324, H02M 7537
Patent
active
048169609
ABSTRACT:
A circuit arrangement for providing in a fail-safe manner an alternating output signal to a load, e.g. in a railway signalling system. The load is connected across a first winding of a transformer, to opposite ends of a second winding of which transformer is connected a bi-directional current switching circuit. First and second modulated signal sources are connected to the bi-directional switching circuit. Each of the signal sources modulates a carrier signal with a modulation signal, the outputs of the signal sources being out of phase with respect to each other. The bi-directional switching circuit is operative to switch current through the second winding alternately in opposite directions at the frequency of the modulation signal. The circuit arrangement is such that if any of its components fails to operate correctly, the output appearing across the first winding is no greater than a threshold level.
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Corrie John D.
Littler Vincent H.
Envall Jr. Roy N.
Gaffin Jeffery A.
Westinghouse Brake & Signal Co. Ltd.
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