US5027250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic circuit with a protection device against fluctuations in the supply battery voltage
Assignee: STMicroelectronics SRL
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Filing: 1989-06-23
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Granted: 1991-06-25
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Expires: 2009-06-23
Abstract
Abstract An electronic circuit with a protection device against fluctuations in the supply battery voltage, being of a type which comprises a MOS power transistor connected between one pole of the battery and an electric load for driving said load to ground, further comprises a pair of Zener diodes connected to each other in a push-pull configuration, between said pole and the gate electrode of the power transistor.
Inventors
- 👤 Carlo Cini
- 👤 Bruno Murari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:35
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/045; H02H9/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
An electronic circuit with a protection device against fluctuations in the supply battery voltage, comprising: (a) a first MOS power transistor connected in series with an electric load between one pole of said battery and ground for driving said load, (b) a first pair of Zener diodes connected back-to-back to each other between said pole and the gate electrode of said first transistor, (c) a second MOS transistor connected between said pole and the first transistor and incorporating a protection device formed of a second pair of Zener diodes connected back-to-back to each other between the gate and the drain of said second transistor.
Claim 2
Dependent Claim
104 words
An electronic circuit with a protection device against fluctuations in the supply battery voltage, comprising: (a) a first MOS power transistor connected in series with an electric load between one pole of said battery and ground for driving said load, (b) a first pair of Zener diodes connected back-to-back to each other between said pole and the gate electrode of said first transistor, (c) a second MOS transistor connected between said pole and the first transistor and incorporating a protection device formed of a second pair of Zener diodes connected back-to-back to each other between the gate and the drain of said second transistor.
Claim 3
Dependent Claim
14 words
A circuit according to claim 1, wherein said second transistor is a power transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |