US3825846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal isolator having feedback control
Assignee: Eaton Corp
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Filing: 1973-04-23
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Granted: 1974-07-23
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Expires: 1993-04-23
Abstract
Abstract A control circuit is provided for electrically isolating an input circuit from an output circuit which is responsive to an input signal in the input circuit. A feedback signal indicative of the response of the output circuit is also provided to the input circuit to improve the controllability of the output circuit by the input circuit. This novel control circuit provides the signal indicative of output circuit response from a duplicating circuit which substantially duplicates the response of the output circuit to the input circuit signal. The output from the duplicating circuit is connected by a feedback loop to the input circuit to establish a control signal in the input circuit. This control signal assures an accurate response of the output circuit and the duplicating circuit to the input signal in the input circuit. The duplicating circuit is electrically isolated from the output circuit to maintain the electrical isolation between the input and output circuits.
Inventors
- 👤 J Grygera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
A control circuit for controlling the output of an output circuit which is responsive to and electrically isolated from an input circuit providing an input signal comprising: a transformer having a center-tapped primary winding and a pair of secondary windings; an input signal amplifier having an input connected to the input signal and an output connected to said center-tapped primary winding to provide an amplified input signal to said primary winding; a chopper circuit connected across said primary winding to alternately conduct the amplified input signal between the center-tap and the ends of said primary winding to induce an output in said pair of secondary windings; one of said pair of secondary windings being electrically connected to said input of said input signal amplifier to provide a feedback signal to said amplifier indicative of the output in said second of said pair of secondary windings; and said second of said pair of secondary windings being electrically isolated from said primary winding and said first of said pair of secondary windings to provide an electrically isolated output signal.
Claim 2
Dependent Claim
177 words
A control circuit for controlling the output of an output circuit which is responsive to and electrically isolated from an input circuit providing an input signal comprising: a transformer having a center-tapped primary winding and a pair of secondary windings; an input signal amplifier having an input connected to the input signal and an output connected to said center-tapped primary winding to provide an amplified input signal to said primary winding; a chopper circuit connected across said primary winding to alternately conduct the amplified input signal between the center-tap and the ends of said primary winding to induce an output in said pair of secondary windings; one of said pair of secondary windings being electrically connected to said input of said input signal amplifier to provide a feedback signal to said amplifier indicative of the output in said second of said pair of secondary windings; and said second of said pair of secondary windings being electrically isolated from said primary winding and said first of said pair of secondary windings to provide an electrically isolated output signal.
Claim 3
Dependent Claim
48 words
A control circuit as set forth in claim 1 including a first rectifier bridge connected across said first of said secondary windings and a second rectifier bridge connected across said second of said secondary windings to provide a rectified output signal from said first and second secondary windings.
Claim 4
Dependent Claim
73 words
A control circuit as set forth in claim 2 including a load matching resistor connected across the output of said first rectifying bridge substantially equivalent to the resistance of an output circuit connected across the output of said second rectifying bridge, said load matching resistor being series connected to said input of said input signal amplifier to establish a rectified signal to said amplifier indicative of the rectified output to said output circuit.
Claim 5
Dependent Claim
70 words
A control circuit as set forth in claim 1 wherein said chopper circuit includes a first transistor connected to one end of said primary winding and a second transistor connected to the other end of said primary winding, said first and second transistors being connected to a multivibrator circuit for alternately firing said first and second transistors to alternately conduct said amplified input signal through said first and second transistors.
References Cited (Backward Citations)
US2832848A
Cited
US3214703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |