Patent US3766402A successfully refreshed from Google Patents.
US3766402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital-to-analog converter parallel-current voltage regulating circuit
Assignee: AT&T Inc
•
Filing: 1971-03-09
•
Granted: 1973-10-16
•
Expires: 1991-03-09
Abstract
Abstract A parallel-current voltage regulating circuit supplies a compensating current to a load resistor primarily energized from an unregulated source so that the voltage across the load resistor is maintained equal to a reference voltage. Dual regulating circuits are used when the polarity of the voltage across the load is reversible.
Inventors
- 👤 J Raamot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:57
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/59; H; H03; H03M; H03M1/00; H03M1/66; H03M1/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
317 words
A circuit for regulating the voltage across a load, the load being connected by a resistive circuit to a source of reversiblepolarity energizing voltage, which comprises: circuitry supplying a positive reference voltage; a first operational amplifier having a first input connected to ground potential, a second input and an output; a first resistor connecting said positive reference circuitry to said second input of said first amplifier; a second resistor substantially equal in magnitude to said first resistor, connecting said load to said second input of said first amplifier; a first feedback circuit connecting said output of said first amplifier to said load to supply a first compensating current to said load when said load voltage is negative to maintain said load voltage substantially equal in magnitude to said positive reference voltage, regardless of variations in the magnitude of said energizing voltage; a first diode connected between said output and said second input of said first amplifier, and poled to conduct when said load voltage is positive to disable said first amplifier; circuitry supplying a negative reference voltage; a second operational amplifier having a first input connected to ground potential, a second input and an output; a third resistor connecting said negative reference circuitry to said second input of said second amplifier; a fourth resistor, substantially equal in magnitude to said third resistor, connecting said load to said second input of said second amplifier; a second feedback circuit connecting said output of said second amplifier to said load to supply a second compensating current to said load when said load voltage is positive, to maintain said load voltage substantially equal in magnitude to said negative reference voltage, regardless of variations in the magnitude of said energizing voltage; and a second diode, connected between said output and said second input of said second amplifier, and poled to conduct when said load voltage is positive to disable said second amplifier.
Claim 2
Dependent Claim
317 words
A circuit for regulating the voltage across a load, the load being connected by a resistive circuit to a source of reversiblepolarity energizing voltage, which comprises: circuitry supplying a positive reference voltage; a first operational amplifier having a first input connected to ground potential, a second input and an output; a first resistor connecting said positive reference circuitry to said second input of said first amplifier; a second resistor substantially equal in magnitude to said first resistor, connecting said load to said second input of said first amplifier; a first feedback circuit connecting said output of said first amplifier to said load to supply a first compensating current to said load when said load voltage is negative to maintain said load voltage substantially equal in magnitude to said positive reference voltage, regardless of variations in the magnitude of said energizing voltage; a first diode connected between said output and said second input of said first amplifier, and poled to conduct when said load voltage is positive to disable said first amplifier; circuitry supplying a negative reference voltage; a second operational amplifier having a first input connected to ground potential, a second input and an output; a third resistor connecting said negative reference circuitry to said second input of said second amplifier; a fourth resistor, substantially equal in magnitude to said third resistor, connecting said load to said second input of said second amplifier; a second feedback circuit connecting said output of said second amplifier to said load to supply a second compensating current to said load when said load voltage is positive, to maintain said load voltage substantially equal in magnitude to said negative reference voltage, regardless of variations in the magnitude of said energizing voltage; and a second diode, connected between said output and said second input of said second amplifier, and poled to conduct when said load voltage is positive to disable said second amplifier.
Claim 3
Dependent Claim
204 words
A circuit for regulating the voltage across a load, the load being connected by a resistive circuit to a source of reversible-polarity energizing voltage, which comprises: circuitry supplying a positive reference voltage; means for comparing the voltage across said load with said positive reference voltage to obtain a first signal related to the difference between said load voltage and said positive reference voltage; means for supplying a first compensating current to said load according to said first signal so that the effect of said first compensating current on said load tends to decrease said first signal; means for disabling said first current supplying means when said load voltage is a second polarity, opposite to said first polarity; circuitry supplying a negative reference voltage; means for comparing the voltage across said load with said negative reference voltage to obtain a second signal related to the difference between said load voltage and said negative reference voltage; means for supplying a second compensating current to said load according to said second signal so that the effect of said second compensating current on said load tends to decrease said second signal; and means for disabling said second current supplying means when said load voltage is said first polarity.
Claim 4
Dependent Claim
204 words
A circuit for regulating the voltage across a load, the load being connected by a resistive circuit to a source of reversible-polarity energizing voltage, which comprises: circuitry supplying a positive reference voltage; means for comparing the voltage across said load with said positive reference voltage to obtain a first signal related to the difference between said load voltage and said positive reference voltage; means for supplying a first compensating current to said load according to said first signal so that the effect of said first compensating current on said load tends to decrease said first signal; means for disabling said first current supplying means when said load voltage is a second polarity, opposite to said first polarity; circuitry supplying a negative reference voltage; means for comparing the voltage across said load with said negative reference voltage to obtain a second signal related to the difference between said load voltage and said negative reference voltage; means for supplying a second compensating current to said load according to said second signal so that the effect of said second compensating current on said load tends to decrease said second signal; and means for disabling said second current supplying means when said load voltage is said first polarity.
References Cited (Backward Citations)
US2881266A
Cited
US3209277A
Cited
US3239733A
Cited
US3343073A
Cited
US3374424A
Cited
US3564444A
Cited
US3531598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |