H - Electricity – 03 – K
Patent
H - Electricity
03
K
321/23, 346/26
H03K 19/007 (2006.01) B61L 1/20 (2006.01) H03K 17/66 (2006.01)
Patent
CA 1241371
Abstract of the Disclosure A circuit arrangement is disclosed for providing in a fail-safe manner an alternating output signal to a load, e.g. in a railway signaling 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, to outputs of the signal sources being in anti-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.
494520
Corrie John D.
Littler Vincent H.
Apv Systems Limited (u.k.)
Ranco Controls Limited
Riches Mckenzie & Herbert Llp
Westinghouse Brake And Signal Company Limited
Westinghouse Brake And Signal Company Limited (u.k.)
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