US4385270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature limited voltage regulator circuit
Assignee: Motorola Solutions Inc
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Filing: 1982-05-12
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Granted: 1983-05-24
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Expires: 2002-05-12
Abstract
Abstract Field coil current of an alternator is controlled in response to temperature as well as to battery voltage, thus allowing maximum safe output power at any ambient temperature. A monostable circuit is utilized for reducing the maximum duty cycle of the field excitation driver in response to a sensed temperature without increasing power dissipation in the regulator.
Inventors
- 👤 Isadore Balan
- 👤 Kirk A. Sievers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/2434; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A temperature limited voltage regulator circuit for an alternator/battery combination and comprising: coil means for providing a magnetic field in the alternator; driver means coupled to the coil means for supplying current thereto; a voltage sensing circuit for sensing an output voltage of the alternator and for providing a first control pulse signal to the driver means in response to the sensed voltage; and a temperature sensing circuit for sensing a temperature related to the alternator and for providing a second control pulse signal to the driver means in response to the sensed temperature, and wherein the current supplied by the driver means to the coil means is a function of the widths of the pulses in the first and second control pulse signals.
Claim 2
Dependent Claim
124 words
A temperature limited voltage regulator circuit for an alternator/battery combination and comprising: coil means for providing a magnetic field in the alternator; driver means coupled to the coil means for supplying current thereto; a voltage sensing circuit for sensing an output voltage of the alternator and for providing a first control pulse signal to the driver means in response to the sensed voltage; and a temperature sensing circuit for sensing a temperature related to the alternator and for providing a second control pulse signal to the driver means in response to the sensed temperature, and wherein the current supplied by the driver means to the coil means is a function of the widths of the pulses in the first and second control pulse signals.
Claim 3
Dependent Claim
64 words
A temperature limited voltage regulator circuit for an alternator/battery combination in accordance with claim 1, and wherein the driver means includes a pair of transistors coupled as a Darlington pair and a third transistor coupled to control the transistor pair, and wherein the temperature sensing circuit includes a transistor for supplying the second control pulse to control the transistor pair in the driver means.
Claim 4
Dependent Claim
33 words
A temperature limited voltage regulator circuit for an alternator/battery combination in accordance with claim 1, and wherein the temperature sensing circuit includes a temperature sensing device positioned adjacent a portion of the alternator.
Claim 5
Dependent Claim
52 words
A temperature limited voltage regulator circuit for an alternator/battery combination in accordance with claim 3, and wherein the temperature sensing circuit includes a monostable multivibrator and a resistor/capacitor combination coupled to control the width of the output pulses of the multivibrator, and the resistor of the combination is the temperature sensing device.
Claim 6
Dependent Claim
25 words
A temperature limited voltage regulator circuit for an alternator/battery combination in accordance with claim 4, and wherein the resistor of the combination is a thermistor.
Claim 7
Dependent Claim
52 words
A temperature limited voltage regulator circuit for an alternator/battery combination in accordance with claim 4, and wherein the voltage sensing circuit includes a wave generator for providing a triangle wave output signal and a square wave output signal and the square wave signal is a trigger input signal for the monostable multivibrator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |