Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and appartus for carrying out the method
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United States of America Patent
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May 27, 1986
Grant Date -
N/A
app pub date -
Sep 30, 1983
filing date -
Feb 5, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method and an apparatus for secure interruption of the supply of electric power from e.g. a low-frequency source (1) to a signal lamp (2) which when alight announces permission for a train to pass. The output voltage (a) of the source (1) is chopped by a chopper device (4) to a high-frequency alternating voltage (e,f) in response to a high-frequency input signal (b) to the chopper device (4) and is transferred from the primary to the secondary side of a transformer (5,6) as well as being rectified and filtered to form a voltage (k) applied to the signal lamp (2), said voltage (k) having a wave form corresponding to the wave form of the output voltage (a) of the source (1) and which is securely interrupted by interrupting the input signal (b) to the chopper device (4).
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