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Patent US3586991A successfully refreshed from Google Patents.
US3586991A
Expired / Lapsed
US
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Overload protection circuit for amplifier
Assignee: Individual
•
Filing: 1968-09-16
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Granted: 1971-06-22
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Expires: 1988-09-16
Abstract
Abstract An overload protection circuit for an amplifier wherein the operational potential of elements comprising the amplifier are limited to a value less than their destruction potential. The protection circuit employs zener diodes or elements having similar characteristics connected to the amplifier to preclude the application of potentials thereto that are capable of destroying elements comprising the amplifier.
Inventors
- 👤 Robert E Vosteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/002; H03F; H03F1/00; H03F1/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
An overload protection circuit for use with a voltage follower having input and output circuits, to protect the input circuit of the voltage follower while having a negligible loading effect thereon comprising: a first element having zener diode characteristics, connected between the input and output circuits of the voltage follower, a second element having zener diode characteristics connected between the output circuit of the voltage follower and a circuit common line of the voltage follower, a DC potential bias source connected to reverse bias the first and second elements, the first and second elements having zener breakdown voltages selected such that conduction of the first and second elements is effected in response to the polarity of the overload at the input circuit of the voltage follower, to limit the potentials at the voltage follower input and output circuits to values less than the destruction potentials of the voltage follower.
Claim 2
Dependent Claim
149 words
An overload protection circuit for use with a voltage follower having input and output circuits, to protect the input circuit of the voltage follower while having a negligible loading effect thereon comprising: a first element having zener diode characteristics, connected between the input and output circuits of the voltage follower, a second element having zener diode characteristics connected between the output circuit of the voltage follower and a circuit common line of the voltage follower, a DC potential bias source connected to reverse bias the first and second elements, the first and second elements having zener breakdown voltages selected such that conduction of the first and second elements is effected in response to the polarity of the overload at the input circuit of the voltage follower, to limit the potentials at the voltage follower input and output circuits to values less than the destruction potentials of the voltage follower.
Claim 3
Dependent Claim
19 words
The voltage follower overload protection circuit recited in claim 1 wherein the first and second elements comprise zener diodes.
Claim 4
Dependent Claim
32 words
The voltage follower overload protection circuit recited in claim 1 wherein the first element comprises a transistor connected to function as a zener diode and the second element comprises a zener diode.
Claim 5
Dependent Claim
19 words
The overload protection circuit recited in claim 1 wherein the voltage follower further comprises an FET active input stage.
Claim 6
Dependent Claim
42 words
The overload protection circuit recited in claim 1 further comprising: decoupling means operatively connected to the input of the voltage follower to block the DC potential bias of the voltage follower from devices connected to the input circuit of the voltage follower.
Claim 7
Dependent Claim
32 words
The overload protection circuit recited in claim 1 further comprising impedance means connected to the input circuit of the voltage follower to limit the magnitude of signals applied to the input circuit.
Claim 8
Dependent Claim
42 words
The overload protection circuit recited in claim 6 further comprising: decoupling means operatively connected to the input of the voltage follower to block the DC potential bias of the voltage follower from devices connected to the input circuit of the voltage follower.
Claim 9
Dependent Claim
25 words
The overload protection circuit recited in claim 1 wherein corresponding electrodes of the first and second elements are connected to the voltage follower output circuit.
Claim 10
Dependent Claim
26 words
The overload protection circuit recited in claim 2 wherein corresponding electrodes of the first and second zener diodes are connected to the voltage follower output circuit.
Claim 11
Dependent Claim
26 words
The overload protection circuit recited in claim 9 wherein the cathodes of the first and second zener diodes are connected to the voltage follower output circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |