Electronic code generating circuit for use in railroad signaling systems
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United States of America Patent
Stats
-
Jul 15, 2003
Grant Date -
Oct 24, 2002
app pub date -
Feb 28, 2001
filing date -
Feb 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electronic code transmitter is disclosed for driving a number of code following relays of a railroad signaling system. The electronic code transmitter comprises a timing circuit and a driving circuit. The timing circuit generates, at a predetermined code rate, square wave pulses with an approximate 50/50 duty cycle. The driving circuit receives the square wave pulses and conducts, at the predetermined code rate, a power source to the code following relays. Where the timing circuit is a timer IC operating in an astable oscillator mode, the timer IC receives an isolated DC power from a DC-DC converter. A resistor is coupled in parallel with the code following relays if the code following relays present a sufficiently high impedance load to the electronic code transmitter. Thereby, the electronic code transmitter is capable to drive code following relays of any load impedance.
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