US4314306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal-powered receiver
Assignee: Hitachi Rail STS USA Inc
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Filing: 1980-07-14
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Granted: 1982-02-02
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Expires: 2000-07-14
Abstract
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.
Inventors
- 👤 John O. G. Darrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:48
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
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.
Claim 2
Dependent Claim
86 words
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.
Claim 3
Dependent Claim
17 words
The signal-powered receiver as defined in claim 1, wherein said input filter is a series resonant circuit.
Claim 4
Dependent Claim
16 words
The signal-powered receiver as defined in claim 1, wherein said demodulator includes a pair of diodes.
Claim 5
Dependent Claim
16 words
The signal-powered receiver as defined in claim 1, wherein said switching device is a semiconductive element.
Claim 6
Dependent Claim
16 words
The signal-powered receiver as defined in claim 1, wherein said modulation filter is a parallel circuit.
Claim 7
Dependent Claim
17 words
The signal-powered receiver as defined in claim 1, wherein said rectifier is a full-wave bridge rectifying network.
Claim 8
Dependent Claim
16 words
The signal-powered receiver as defined in claim 1, wherein said load is a vital electromagnetic relay.
Claim 9
Dependent Claim
18 words
The signal-powered receiver as defined in claim 1, wherein said input filter is transformer coupled to said demodulator.
Claim 10
Dependent Claim
18 words
The signal-powered receiver as defined in claim 1, wherein said modulation filter is transformer coupled to said rectifier.
Claim 11
Dependent Claim
26 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |