Patent US4390794A successfully refreshed from Google Patents.
US4390794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for controlling the switch-on of supply voltage
Assignee: US Philips Corp
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Filing: 1982-01-25
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Granted: 1983-06-28
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Expires: 2002-01-25
Abstract
Abstract Circuit for the delayed switch-on of a supply voltage in an electric apparatus which has at least a first and a second supply terminal, the series arrangement of the emitter-base path of a first transistor and the collector-emitter path of a second transistor being arranged between the first and the second supply terminals, the base of the second transistor being connected to a voltage divider provided between the collector of the first transistor and the second supply terminal.
Inventors
- 👤 Wilhelmus G. Kuiper
- 👤 Anne Klaassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:11
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1607; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; H04B1/02; H04B1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A circuit arrangement for controlling the switch-on of a supply voltage in an electrical apparatus which has first and second supply terminals, the series arrangement of the emitter-base path of a first transistor and the collector-emitter path of a second transistor being arranged between the first and second supply terminals, the base of the second transistor being connected to a voltage divider provided between the collector of the first transistor and the second supply terminal, characterized in that a second series arrangement of a resistor, a photodiode, a Zener diode and a switching element is arranged between the first and second supply terminals, the collector of the first transistor being connected to a point on the second series arrangement via at least a diode.
Claim 2
Dependent Claim
124 words
A circuit arrangement for controlling the switch-on of a supply voltage in an electrical apparatus which has first and second supply terminals, the series arrangement of the emitter-base path of a first transistor and the collector-emitter path of a second transistor being arranged between the first and second supply terminals, the base of the second transistor being connected to a voltage divider provided between the collector of the first transistor and the second supply terminal, characterized in that a second series arrangement of a resistor, a photodiode, a Zener diode and a switching element is arranged between the first and second supply terminals, the collector of the first transistor being connected to a point on the second series arrangement via at least a diode.
Claim 3
Dependent Claim
42 words
A circuit arrangement as claimed in claim 1, characterized in that last-mentioned diode is a stabistor, the cathode of which is connected to the cathode of the Zener diode, the forward voltage of the stabistor exceeding the forward voltage of the photodiode.
Claim 4
Dependent Claim
50 words
A circuit arrangement as claimed in claim 1, characterized in that the collector of the first transistor is connected via the series arrangement of a diode and a second Zener diode to that end of the resistor in the second series arrangement which is remote from the first supply terminal.
References Cited (Backward Citations)
US4113419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |