Patent US3764818A successfully refreshed from Google Patents.
US3764818A
Expired / Lapsed
US
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Switching circuit
Assignee: Denki Onkyo Co Ltd
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Filing: 1971-11-09
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Granted: 1973-10-09
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Expires: 1991-11-09
Abstract
Abstract A switching circuit compensating the bias potential of a switching element by automatically varying the value of the current supplied by a current control means to a matrix, comprising a bias resistor circuit formed by series connecting a semiconductor device having a resistance effect and a fixed resistor, a impedance matrix formed by connecting in parallel said bias resistor circuit to a power supply, a control means interpositioned between the impedance matrix and the power supply, and a switching element provided in each bias resistor circuit of said impedance matrix wherein a control electrode is connected between said semiconductor device and fixed resistor.
Inventors
- 👤 N Masuda
- 👤 M Kuroyanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/90; H03K17/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A temperature compensated switching circuit comprising, a. an impedance matrix circuit including a plural number of bias resistance circuits, each containing series-connected semiconductor devices having a resistive effect and a fixed resistor wherein said bias resistance circuits are parallelconnEcted; b. current control means connected between a power supply and said impedance matrix circuit, wherein said current control means controls the current through said impedance matrix circuit; c. switching means having a control electrode connected to each bias resistance circuit such that the voltage across both ends of the matrix circuit is divided by semiconductor devices and fixed resistors, and applied to said control electrode, and d. at least one actuating means, which selects at least one semiconductor device of said matrix circuit when actuated, for varying the resistance value of the selected semiconductor device, wherein the switching circuit is related to the matrix circuit so that said current control means decreases the current flowing therein when the impedance of said matrix circuit increases and increases the current flowing therein when the impedance of the matrix circuit decreases.
Claim 2
Dependent Claim
177 words
A temperature compensated switching circuit comprising, a. an impedance matrix circuit including a plural number of bias resistance circuits, each containing series-connected semiconductor devices having a resistive effect and a fixed resistor wherein said bias resistance circuits are parallelconnEcted; b. current control means connected between a power supply and said impedance matrix circuit, wherein said current control means controls the current through said impedance matrix circuit; c. switching means having a control electrode connected to each bias resistance circuit such that the voltage across both ends of the matrix circuit is divided by semiconductor devices and fixed resistors, and applied to said control electrode, and d. at least one actuating means, which selects at least one semiconductor device of said matrix circuit when actuated, for varying the resistance value of the selected semiconductor device, wherein the switching circuit is related to the matrix circuit so that said current control means decreases the current flowing therein when the impedance of said matrix circuit increases and increases the current flowing therein when the impedance of the matrix circuit decreases.
Claim 3
Dependent Claim
47 words
A switching circuit according to claim 1, wherein a fixed resistor is included as the current control means and wherein said matrix circuit includes semiconductor devices having negative temperature characteristics, connected such that the semiconductor devices are positioned on the same side as the current control means.
Claim 4
Dependent Claim
47 words
A switching circuit according to claim 1, wherein a fixed resistor is employed as the current control means and wherein said matrix circuit includes semiconductor devices having positive temperature characteristics connected such that the fixed resistors are positioned on the same side as the current control means.
Claim 5
Dependent Claim
51 words
A switching circuit according to claim 1, wherein transistors are included as the current control means and the output terminal of said transistor is connected to said matrix circuit with the base of the transistor connected to a bias resistor so that it may be impedance controlled by the matrix circuit.
Claim 6
Dependent Claim
44 words
A switching circuit according to claim 4, wherein the matrix circuit includes semiconductor devices having positive temperature characteristics, connected to the transistor included as the current control means such that the semiconductor devices are positioned on the output side of the current control transistor.
Claim 7
Dependent Claim
45 words
A switching circuit according to claim 4, wherein a matrix circuit including semiconductor devices having negative temperature characteristics is connected to the transistor included as the current control means such that the fixed resistors are positioned on the output side of the current control transistor.
Claim 8
Dependent Claim
68 words
A switching circuit according to claim 1, wherein a power supply circuit, which varies the current value to be supplied to the current control means to assist the control function of the means, is connected to said current control means and the power supply circuit includes the transistor which is actuated by the bias potential controlled in accordance with the variation in the impedance of the matrix circuit.
Claim 9
Dependent Claim
24 words
A switching circuit according to claim 7, wherein a regulated diode is employed for bias resistance of the transistor of the power supply circuit.
Claim 10
Dependent Claim
35 words
A switching circuit according to claim 1, wherein a stabilized resistor circuit is connected across both ends of the impedance matrix circuit so that the stabilized resistor circuit is parallel-connected to the bias resistance circuits.
References Cited (Backward Citations)
US3329869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |