US3568074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-sensitive circuit
Assignee: General Electric Co
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Filing: 1968-08-01
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Granted: 1971-03-02
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Expires: 1988-08-01
Abstract
Abstract An AC input signal is divided between two branch circuits, one comprising an LC series resonance circuit in series connection with a first unidirectional current device, and the other comprising a resistor in series connection with a second unidirectional current device poled opposite to the first unidirectional current device. The two branch circuits are connected in parallel to a common output terminal. A nonpolarized capacitor is connected between the output terminal and an electrical reference or ground to bypass to ground the AC voltage component that otherwise would exist at the output terminal, and to provide a smooth DC signal having one polarity when the frequency of the AC input signal is within a predetermined frequency range and an opposite polarity when the frequency is outside the predetermined frequency range.
Inventors
- 👤 James W Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:16
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
279 words
A frequency sensitive circuit for providing a unidirectional current of one polarity to a load when the alternating voltage sensed is within a prescribed frequency range (predominately in the opposite direction) and a unidirectional current of the opposite polarity when the alternating voltage is outside said frequency range comprising: a first branch circuit including a frequency selective resonant circuit and unidirectional current conducting means coupled between a source of alternating voltage of varying frequency and a load to supply current of one polarity of said load when said alternating voltage is applied thereto; a second branch circuit including resistive means and unidirectional conducting means also coupled between a source of alternating voltage of varying frequency and said load means adapted to supply current of the opposite polarity to said load when said alternating voltage is applied thereto; the impedance of the frequency selective resonant circuit and resistive means being at a selected upper and lower frequency of said alternating voltage to define said frequency range such that the impedance of the frequency selective resonant circuit is less than that of the resistive means within said prescribed frequency range and the magnitude of the current flow in said first branch circuit exceeds that in said second branch circuit and is greater than that of the resistive means outside of said frequency range and the magnitude of the current flow is less than the current flow in said second branch whereby a unidirectional current of one polarity is supplied to the load when the alternating voltage is within the prescribed frequency range, and a unidirectional current of the opposite polarity is supplied when the alternating voltage is outside said frequency range.
Claim 2
Dependent Claim
279 words
A frequency sensitive circuit for providing a unidirectional current of one polarity to a load when the alternating voltage sensed is within a prescribed frequency range (predominately in the opposite direction) and a unidirectional current of the opposite polarity when the alternating voltage is outside said frequency range comprising: a first branch circuit including a frequency selective resonant circuit and unidirectional current conducting means coupled between a source of alternating voltage of varying frequency and a load to supply current of one polarity of said load when said alternating voltage is applied thereto; a second branch circuit including resistive means and unidirectional conducting means also coupled between a source of alternating voltage of varying frequency and said load means adapted to supply current of the opposite polarity to said load when said alternating voltage is applied thereto; the impedance of the frequency selective resonant circuit and resistive means being at a selected upper and lower frequency of said alternating voltage to define said frequency range such that the impedance of the frequency selective resonant circuit is less than that of the resistive means within said prescribed frequency range and the magnitude of the current flow in said first branch circuit exceeds that in said second branch circuit and is greater than that of the resistive means outside of said frequency range and the magnitude of the current flow is less than the current flow in said second branch whereby a unidirectional current of one polarity is supplied to the load when the alternating voltage is within the prescribed frequency range, and a unidirectional current of the opposite polarity is supplied when the alternating voltage is outside said frequency range.
Claim 3
Dependent Claim
43 words
A frequency sensitive circuit as defined in claim 1 wherein the frequency selective resonant circuit is a series resonant circuit and the unidirectional current conducting means of said second branch are poled opposite to the unidirectional current conducting means of said first branch.
Claim 4
Dependent Claim
52 words
A frequency sensitive circuit as recited in claim 2 further including first and second input terminals and first and second output terminals, said first and second branches interconnecting the first input terminal to the first output terminal, and said second input and output terminals being interconnected to form a common current path.
Claim 5
Dependent Claim
23 words
A frequency sensitive circuit as recited in claim 2 wherein said series resonant circuits comprises an inductor and a capacitor in series connection.
Claim 6
Dependent Claim
35 words
A frequency sensitive circuit as recited in claim 4 wherein the unidirectional current conducting means of said first and second branches each comprises a pair of rectifiers oriented to conduct current in the same direction.
Claim 7
Dependent Claim
52 words
A frequency sensitive circuit as recited in claim 5 wherein said series resonant circuit is connected to the pair of rectifiers for the first branch at the point of rectifier interconnection and the resistive means is connected to the pair of rectifiers for the second branch at the point of rectifier interconnection.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |