US4078216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for the parallel coupling of audio frequency central-control transmitting stations in a wave band filter construction
Assignee: Siemens Building Technologies AG
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Filing: 1975-10-24
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Granted: 1978-03-07
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Expires: 1995-10-24
Abstract
Abstract A circuit for the parallel coupling of audio frequency transmitting stations in a wave band filter construction is described, in which the wave band filter consists of two resonant circuits tuned to an audio frequency essentially free of the line harmonics, coupled magnetically to each other, and electrically separated, and in which the line-side circuit has been designed as a series resonant circuit, and the capacitor of the generator-side resonant circuit has been connected in parallel to the audio generator and to the coupling inductance of an ironless coupling transformer.
Inventors
- 👤 Paul Kamber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/56; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5425; H04B2203/5429; H04B2203/545; H04B2203/5462; H04B2203/5483; H04B2203/5491; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A circuit for electromagnetically coupling the output of an audio frequency generator operating at an audio frequency to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; and a second capacitor connected in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; said generator-side resonant circuit and said system-side resonant circuit each being tuned to the output frequency of the audio frequency generator.
Claim 2
Dependent Claim
136 words
A circuit for electromagnetically coupling the output of an audio frequency generator operating at an audio frequency to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; and a second capacitor connected in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; said generator-side resonant circuit and said system-side resonant circuit each being tuned to the output frequency of the audio frequency generator.
Claim 3
Dependent Claim
26 words
A circuit according to claim 1, wherein a third capacitor has been connected in series between said generator-side parallel resonant circuit and the audio frequency generator.
Claim 4
Dependent Claim
54 words
A circuit according to claim 1, wherein a generator-side series resonant circuit, comprising a third inductance coil in series with a third capacitor, is connected in series between said generator-side parallel resonant circuit and the audio frequency generator, said generator-side series resonant circuit being tuned to the output frequency of the audio frequency generator.
Claim 5
Dependent Claim
169 words
A circuit for electromagnetically coupling the output of the audio frequency generator operating at an audio frequency to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; and a second capacitor connector in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; said system-side resonant circuit being tuned to the output frequency of the audio frequency generator, and said generator-side parallel resonant circuit being tuned to a frequency different from said system frequency and its harmonics so that the impedance of said generator-side resonant circuit is capacitive at the output frequency of the audio frequency generator.
Claim 6
Dependent Claim
169 words
A circuit for electromagnetically coupling the output of the audio frequency generator operating at an audio frequency to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; and a second capacitor connector in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; said system-side resonant circuit being tuned to the output frequency of the audio frequency generator, and said generator-side parallel resonant circuit being tuned to a frequency different from said system frequency and its harmonics so that the impedance of said generator-side resonant circuit is capacitive at the output frequency of the audio frequency generator.
Claim 7
Dependent Claim
214 words
A circuit for electromagnetically coupling the output of an audio frequency generator of the on-load static inverter type operating an audio frequency, to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; a second capacitor connected in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; and a generator-side series resonant circuit, comprising a third inductance coil in series with a third capacitor, connected in series between said generator-side parallel resonant circuit and the audio frequency generator; said system-side resonant circuit being tuned to the output frequency of the audio frequency generator, and said generator-side parallel resonant circuit and said generator-side series resonant circuit each being tuned to a frequency different from said system frequency and its harmonics so that the impedance of each of said two generator-side resonant circuits is capacitive at the output frequency of the audio frequency generator.
Claim 8
Dependent Claim
214 words
A circuit for electromagnetically coupling the output of an audio frequency generator of the on-load static inverter type operating an audio frequency, to an electrical mains system operating at a system frequency, said audio frequency being different from said system frequency and its harmonics, comprising: an ironless transformer having a first inductance coil coupled magnetically to a parallel second inductance coil, said first and second inductance coils being electrically separated; a first capacitor connected in parallel with said first inductance coil to form a generator-side parallel resonant circuit for connection to the audio frequency generator; a second capacitor connected in series to said second inductance coil to form a system-side resonant circuit for connection to the electrical mains system; and a generator-side series resonant circuit, comprising a third inductance coil in series with a third capacitor, connected in series between said generator-side parallel resonant circuit and the audio frequency generator; said system-side resonant circuit being tuned to the output frequency of the audio frequency generator, and said generator-side parallel resonant circuit and said generator-side series resonant circuit each being tuned to a frequency different from said system frequency and its harmonics so that the impedance of each of said two generator-side resonant circuits is capacitive at the output frequency of the audio frequency generator.
Claim 9
Dependent Claim
43 words
A circuit according to claim 5, wherein the ratio of the impedance of said generator-side series resonant circuit to the impedance of said generator-side parallel resonant circuit at the output frequency of the audio frequency generator is in the range 0.3 to 1.0.
Claim 10
Dependent Claim
57 words
A circuit according to claim 6, wherein the ratio of the total impedance of the generator-side series resonant circuit to the impedance of its component third inductance coil, to the impedance of its third capacitor at the output frequency of the audio frequency generator is between 1 : 2 : 3 and 1 : 3 : 4.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |