US4137557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic cut-out device
Assignee: ITALIANA VETRO S V SpA Soc
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Filing: 1978-02-13
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Granted: 1979-01-30
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Expires: 1998-02-13
Abstract
Abstract A device for cutting out non-essential loads in a generator and battery-fed electric plant includes a voltage detecting unit connected across the terminals of the battery. The detecting unit may be a relay. Whenever the voltage at the terminals falls below a predetermined level, the detecting unit effects the disconnection of the non-essential load or loads from the terminals of the battery and generator, while allowing the essential load or loads. The detecting unit preferably includes a differential amplifier having one of its inputs connected to a voltage divider connected in parallel with the battery and its second input coupled to a source of reference potential.
Inventors
- 👤 Giorgio Ciarniello
- 👤 Oscar De Lena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:58
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/002; H02H; H02H3/00; H02H3/02; H02H3/033; H02J3/00; H02J3/12; H02J3/14; H02J7/00; H02J7/14; H02J7/1438; H02J2105/00; H02J2105/50; H02J2105/52; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A device to cut out non-essential loads in a generator and battery fed electric plant including, in addition to a circuit of essential loads, also a circuit of at least one non-essential load, said device comprising a voltage responsive means connected across terminals of said battery for opening said circuit of at least one non-essential load whenever voltage at said terminals falls below a pre-set level, said voltage responsive means including an integrated unit having means for developing a constant reference voltage and a differential amplifier; a power transistor, said differential amplifier having its output controllably connected to said power transistor; and a normally closed contact relay coupled to said power transistor to be activated thereby whenever the output of said differential amplifier exceeds a pre-adjustable critical level, said output being proportional to the difference between the battery voltage and said constant reference voltage.
Claim 2
Independent Claim
144 words
A device to cut out non-essential loads in a generator and battery fed electric plant including, in addition to a circuit of essential loads, also a circuit of at least one non-essential load, said device comprising a voltage responsive means connected across terminals of said battery for opening said circuit of at least one non-essential load whenever voltage at said terminals falls below a pre-set level, said voltage responsive means including an integrated unit having means for developing a constant reference voltage and a differential amplifier; a power transistor, said differential amplifier having its output controllably connected to said power transistor; and a normally closed contact relay coupled to said power transistor to be activated thereby whenever the output of said differential amplifier exceeds a pre-adjustable critical level, said output being proportional to the difference between the battery voltage and said constant reference voltage.
Claim 3
Dependent Claim
29 words
A device according to claim 1, wherein said differential amplifier has its first input connected to a tap on a voltage divider connected across said terminals of said battery.
Claim 4
Dependent Claim
11 words
A device according to claim 2, wherein said tap is adjustable.
Claim 5
Dependent Claim
23 words
A device according to claim 3, wherein said differential amplifier has its second input coupled to a source of said constant reference voltage.
Claim 6
Dependent Claim
39 words
A device according to claim 4, including a further voltage divider, said further voltage divider being connected across said source of said constant reference voltage and said second input is connected to a tap on said further voltage divider.
Claim 7
Dependent Claim
16 words
A device according to claim 5, wherein said tap on said further voltage divider is fixed.
Claim 8
Dependent Claim
27 words
A device according to claim 1, wherein said voltage responsive means is directly, conductively connected across said terminals of said battery free of series connected semiconductive members.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |