Signal-powered receiver

• US 4,314,306 A
• Filed: 07/14/1980
• Issued: 02/02/1982
• Est. Priority Date: 07/14/1980
• Status: Expired due to Term

• Current Assignee: Union Switch & Signal, Inc. (Hitachi, Ltd.)
• Original Assignee: American Standard Companies Incorporated (Ideal Standard International Topco SCA)
• Inventors: Darrow, John O. G.
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Schroeder, L. C.
• Application Number:
  US06/168,861
• Time in Patent Office: 568 Days
• Field of Search: 361/182, 361/184, 361/171, 361/172, 361/203, 246/34 C, 455/343
• US Class Current: 361/182
• CPC Class Codes: B61L 23/168 using coded current

Abstract

A self-powered receiver including a series resonant circuit tuned to the carrier frequency of a modulated carrier signal. A demodulator for detecting the envelope which switches a switching transistor ON during the mark portions of the modulator carrier signals and switches the switching transistor OFF during the space portions. A parallel resonant circuit is driven by the switching transistor to produce a.c. modulations to be coupled to a full-wave rectifier. The rectified voltage of the rectifier is used to energize an electromagnetic relay.

Claims

1. A signal-powered receiver comprising, an input filter for receiving a modulated carrier signal, a demodulator coupled to said input filter for detecting the modulating signal, a switching device connected to said demodulator and being turned ON and OFF by the detected modulating signal, a modulation filter connected to said switching device which is free to swing to the opposite polarity of the modulation cycle during the OFF period, and a rectifier coupled to said modulation filter for producing a d.c. output voltage for energizing a load.

2. The signal-powered receiver as defined in claim 1, wherein said input filter is a series resonant circuit.

3. The signal-powered receiver as defined in claim 1, wherein said demodulator includes a pair of diodes.

4. The signal-powered receiver as defined in claim 1, wherein said switching device is a semiconductive element.

5. The signal-powered receiver as defined in claim 1, wherein said modulation filter is a parallel circuit.

6. The signal-powered receiver as defined in claim 1, wherein said rectifier is a full-wave bridge rectifying network.

7. The signal-powered receiver as defined in claim 1, wherein said load is a vital electromagnetic relay.

8. The signal-powered receiver as defined in claim 1, wherein said input filter is transformer coupled to said demodulator.

9. The signal-powered receiver as defined in claim 1, wherein said modulation filter is transformer coupled to said rectifier.

10. The signal-powered receiver as defined in claim 1, wherein said input filter is an L-C tuned circuit and said modulation filter is an L-C tuned circuit.