US3585453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for protecting electrical load of automotive vehicles
Assignee: Denso Corp
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Filing: 1969-05-21
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Granted: 1971-06-15
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Expires: 1989-05-21
Abstract
Abstract A device for protecting an electrical load of an automotive vehicle comprising a Zener diode connected to the output terminal of a power source circuit of the automotive vehicle, a switching circuit including a semiconductor element connected to said Zener diode so that said semiconductor element operates in response to flow of current across said Zener diode, and a control circuit for the electrical load such as a lamp, said control circuit having its input terminal connected to the output terminal of said switching circuit. In the device, an unusually high voltage generated in the power source circuit is instantaneously detected by the Zener diode and the switching circuit is thereby operated to forcedly cut off the control circuit for the electrical load so as to prevent any damage to the electrical load.
Inventors
- 👤 Hisashi Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:50
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/20; H02H3/202
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A device for protecting an electrical load of an automotive vehicle from unusually high voltages, said device comprising: a Zener diode electrically connected to an output terminal of a power source circuit of the vehicle and adapted to conduct upon receiving an unusually high voltage from said power source, a switching circuit including a semiconductor element connected to said Zener diode so that said semiconductor element operates in response to the conduction of said Zener diode, and a control circuit for said electrical load said control circuit having output terminals electrically connected between one end of said load and said power circuit and an input terminal electrically connected to an output terminal of said switching circuit for electrically isolating said load from said power circuit upon detecting an unusually high voltage.
Claim 2
Independent Claim
131 words
A device for protecting an electrical load of an automotive vehicle from unusually high voltages, said device comprising: a Zener diode electrically connected to an output terminal of a power source circuit of the vehicle and adapted to conduct upon receiving an unusually high voltage from said power source, a switching circuit including a semiconductor element connected to said Zener diode so that said semiconductor element operates in response to the conduction of said Zener diode, and a control circuit for said electrical load said control circuit having output terminals electrically connected between one end of said load and said power circuit and an input terminal electrically connected to an output terminal of said switching circuit for electrically isolating said load from said power circuit upon detecting an unusually high voltage.
Claim 3
Dependent Claim
20 words
A device for protecting an electrical load as in claim 1, wherein said electrical load comprises at least one lamp.
Claim 4
Dependent Claim
73 words
A device for protecting an electrical load as in claim 1 wherein said load comprises a plurality of separate loads and including at least one of said control circuits for each of said separate loads and wherein the input terminal for each of the control circuits is connected to the output of said switching circuit through a diode for maintaining the isolation of said separate loads by preventing the flow of reverse current.
Claim 5
Dependent Claim
53 words
A device for protecting an electrical load as in claim 1, wherein said semiconductor element is connected to the output terminal of said power source circuit through said Zener diode and a first resistor, and wherein the junction point of said Zener diode and said first resistor is grounded through a second resistor.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |