US3725679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe signal shaping circuit
Assignee: Trane US Inc
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Filing: 1971-09-15
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Granted: 1973-04-03
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Expires: 1991-09-15
Abstract
Abstract This disclosure relates to a fail-safe signal shaping circuit which removes the harmonic producing portions from a square-wave input signal. The signal shaping circuit includes an electronic switching circuit and a series resonant L-C circuit for transforming the leading edge of the square-wave input signal into one half cycle of a cosine wave and for transforming the trailing edge of the square-wave input signal into another half cycle of a cosine wave.
Inventors
- 👤 J Darrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:37
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A fail-safe signal shaping circuit for removing sharp harmonic producing portions from an input signal comprising, a source of input signals, an electronic switching circuit connected to said source of input signals, said switching circuit including a first and a second driving transistor and a first and a second driven transistor, said first driving transistor controlling the conductive condition of said first driven transistor and said second driving transistor controlling the conductive condition of said second driven transistor so that said first and said second driven transistors are alternately rendered conductive, and a series L-C circuit connected to said first and said second driven transistors wherein the conduction of said first driven transistor causes the leading edge of said input signals to be transformed into one half cycle of a raised cosine wave form and the conduction of said second driven transistor causes the trailing edge of said input signals to be transformed into another half cycle of a raised cosine wave form.
Claim 2
Dependent Claim
163 words
A fail-safe signal shaping circuit for removing sharp harmonic producing portions from an input signal comprising, a source of input signals, an electronic switching circuit connected to said source of input signals, said switching circuit including a first and a second driving transistor and a first and a second driven transistor, said first driving transistor controlling the conductive condition of said first driven transistor and said second driving transistor controlling the conductive condition of said second driven transistor so that said first and said second driven transistors are alternately rendered conductive, and a series L-C circuit connected to said first and said second driven transistors wherein the conduction of said first driven transistor causes the leading edge of said input signals to be transformed into one half cycle of a raised cosine wave form and the conduction of said second driven transistor causes the trailing edge of said input signals to be transformed into another half cycle of a raised cosine wave form.
Claim 3
Dependent Claim
42 words
A fail-safe signal shaping circuit as defined in claim 1, wherein a first isolating diode is connected between said L-C circuit and said first driven transistor and a second isolating diode is connected between said L-C circuit and said second driven transistor.
Claim 4
Dependent Claim
29 words
A fail-safe signal shaping circuit as defined in claim 2, wherein said first and said second isolating diodes are connected in series and are poled in the same direction.
Claim 5
Dependent Claim
23 words
A fail-safe signal shaping circuit as defined in claim 1, wherein said L-C circuit includes a pair of capacitors forming a capacitance divider.
Claim 6
Dependent Claim
25 words
A fail-safe signal shaping circuit as defined in claim 1, wherein said first and said second transistors are a pair of series connected complementary transistors.
Claim 7
Dependent Claim
24 words
A fail-safe signal shaping circuit as defined in claim 1, wherein said first and said second driving transistors are a pair of cascaded transistors.
Claim 8
Dependent Claim
32 words
A fail-safe signal shaping circuit as defined in claim 2, wherein the inductor of said L-C circuit is connected to the junction point of said series connected first and second isolating diodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |