US3818319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulator turn-on overshoot elimination
Assignee: Mobil Oil AS
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Filing: 1973-03-14
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Granted: 1974-06-18
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Expires: 1993-03-14
Abstract
Abstract A variable current generator supplies charging current to the feedback filter capacitance during the startup of the regulated voltage generator. The variable current generator is controlled by an auxiliary charging circuit which acts to rapidly charge the capacitance in the feedback filter. This prevents overshoot in the output of the voltage generator upon startup due to a time lag between the voltage at the output of the alternator and the voltage at the input of the feedback amplifier. This time lag is otherwise caused by the time required to charge the capacitance in the feedback filter. However, the auxiliary charging circuit and variable current generator of this invention charge the capacitance thereby eliminating the time lag and preventing overshoot. A circuit turns off the current generator when the output of the alternator reaches its regulated value.
Inventors
- 👤 J Harrell
- 👤 B Patton
- 👤 J Sexton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:27
CPC Classifications
G; G05; G05B; G05B5/00; G05B5/01; H; H02; H02P; H02P9/00; H02P9/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
In a voltage regulator of the type including: a primary generator, a comparator amplifier for comparing a reference voltage to the output of said generator, the output of said comparator amplifier being applied to regulate said generator, and a feedback loop including a capacitor connected between the output of said voltage generator and the input of said comparator amplifier, the improvement of a circuit for preventing overshoot in the output of said generator upon startup due to a time lag between the voltage at the output of said generator and the voltage at the input of said comparator amplifier caused by the time required to initially charge said capacitor comprising: means for supplying charging current to said capacitor to effectively reduce the time constant of said feedback loop during startup and to disable the normal function of said feedback loop, and a circuit for turning off said current supply means following startup to return normal function to said feedback loop to control said primary generator in reaching its regulated value.
Claim 2
Dependent Claim
170 words
In a voltage regulator of the type including: a primary generator, a comparator amplifier for comparing a reference voltage to the output of said generator, the output of said comparator amplifier being applied to regulate said generator, and a feedback loop including a capacitor connected between the output of said voltage generator and the input of said comparator amplifier, the improvement of a circuit for preventing overshoot in the output of said generator upon startup due to a time lag between the voltage at the output of said generator and the voltage at the input of said comparator amplifier caused by the time required to initially charge said capacitor comprising: means for supplying charging current to said capacitor to effectively reduce the time constant of said feedback loop during startup and to disable the normal function of said feedback loop, and a circuit for turning off said current supply means following startup to return normal function to said feedback loop to control said primary generator in reaching its regulated value.
Claim 3
Dependent Claim
44 words
The Regulator recited in claim 1 wherein said means for supplying charging current includes a transistor having its emitter and collector connected between a source of charging current and the feedback loop capacitor, the base of said transistor being connected to said turn-off circuit.
Claim 4
Dependent Claim
49 words
The regulator recited in claim 2 wherein said circuit for turning said means for supplying charging current off includes a resistor connected between the output of said primary generator and the base of said transistor to turn off said transistor when said primary generator voltage reaches a predetermined value.
Claim 5
Dependent Claim
23 words
The regulator recited in claim 3 wherein said turn-off circuit includes a capacitor connected between the base of said transistor and a reference.
Claim 6
Dependent Claim
38 words
The regulator recited in claim 4 wherein said turn-off circuit further includes a Zener diode connected across said capacitor to prevent the voltage on said capacitor from exceeding a predetermined level thereby protecting said transistor from voltage damage.
References Cited (Backward Citations)
US3243689A
Cited
US3525924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |