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US 5,331,288 AGranted
Railroad rail signal receiver having frequency conversion and a resonant tuned transformer secondary
AssigneeUnion Switch & Signal Inc.
InventorJohn O. G. Darrow
Life of this patent
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Abstract
A receiver for use in receipt of signals on railroad rails which converts the rail signal to a higher frequency and feeds the higher frequency signal into an input transformer. The secondary of the input transformer is in a tuned circuit which is resonate at the higher frequency and which contains a winding of an output transformer. The tuned circuit can be tuned to the higher frequency by series components such as a resistor and capacitor.
Claims25
A receiver for reception of signals transmitted on railroad rails comprising:
- frequency converter means for converting the frequency of said signal into a higher frequency signal;
- an input transformer having a primary winding electrically connected to said frequency converter means to conduct said higher frequency signal in said primary winding;
- the secondary winding of said input transformer connected as an active circuit element of a resonant circuit having a resonant frequency generally equal to the frequency of said higher frequency signal;
- and
- an output transformer having a first winding and a second winding, said first winding being an active circuit element in said resonant circuit and said second winding mechanically coupled to said first winding to provide an output signal corresponding to said higher frequency signal.
2 more elements
A receiver for reception of signals transmitted on railroad rails comprising:
- frequency converter means for converting the frequency of said signal into a higher frequency signal;
- an input transformer having a primary winding electrically connected to said frequency converter means to conduct said higher frequency signal in said primary winding;
- the secondary winding of said input transformer connected as an active circuit element on a resonant circuit having a resonant frequency generally equal to the frequency of said higher frequency signal;
- an output transformer having a first winding and a second winding, said first winding being an active circuit element in said resonant circuit and said second winding magnetically coupled to said first winding to provide an output signal corresponding to said higher frequency signal;
- said frequency converter means includes solid state switching means for switching said signal at said higher frequency;
- said solid state switching means alternates the polarity of said signal at said higher frequency;
- and
- said solid state switching means includes two pairs of field effect transistors connected in a chopper circuit, each pair having one of said transistors having a gate controlled by a switching signal and the other of said transistors having a gate controlled by said switching signal through an inverter.
5 more elements
Dependencies are inferred from the claim text.