Patent US3813666A successfully refreshed from Google Patents.
US3813666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply mode indicator lamp circuit
Assignee: Forbro Design Corp
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Filing: 1973-03-02
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Granted: 1974-05-28
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Expires: 1993-03-02
Abstract
Abstract Voltage and current mode indicator lamps are connected in series across the bias voltage supply of an operational amplifier. The junction between the two lamps is connected to the output terminal of the amplifier. One input is connected to a source of reference voltage and the other to the output of the error voltage amplifier. As long as the voltage amplifier is controlling the power supply output, the voltage mode lamp is on. When the control switches to current mode, the error voltage amplifier output changes and switches the voltage mode lamp off and the current mode lamp on.
Inventors
- 👤 J Gately
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:50
CPC Classifications
H; H02; H02M; H02M3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
In a mode indicator for cross-over power supplies, the combination of; an operational amplifier utilizing a source of positive bias and a source of negative bias and including an inverting input terminal, a non-inverting input terminal, and an output terminal; a source of positive bias for said amplifier; a source of negative bias for said amplifier; two indicator lamps connected in series and bridged across said positive and negative bias sources; a connection between said output terminal and the junction between said lamps; a source of signal characterized by a significant change in response to the change of mOde to be indicated connected to one of said input terminals; and a source of refernce voltage connected to the other of said input terminals.
Claim 2
Dependent Claim
123 words
In a mode indicator for cross-over power supplies, the combination of; an operational amplifier utilizing a source of positive bias and a source of negative bias and including an inverting input terminal, a non-inverting input terminal, and an output terminal; a source of positive bias for said amplifier; a source of negative bias for said amplifier; two indicator lamps connected in series and bridged across said positive and negative bias sources; a connection between said output terminal and the junction between said lamps; a source of signal characterized by a significant change in response to the change of mOde to be indicated connected to one of said input terminals; and a source of refernce voltage connected to the other of said input terminals.
Claim 3
Dependent Claim
25 words
A mode indicator as set forth in claim 1, and including; positive feedback means connected between the output of said amplifier and said non-inverting terminal.
Claim 4
Dependent Claim
20 words
A mode indicator as set forth in claim 1, and including; a zener diode connected across both of said lamps.
Claim 5
Dependent Claim
25 words
A mode indicator as set forth in claim 1; wherein said source of signal is one of the control amplifiers in the cross-over power supply.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |