Claims
- 1. 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.
- 2. 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.
- 3. A device according to claim 2, wherein said tap is adjustable.
- 4. A device according to claim 3, wherein said differential amplifier has its second input coupled to a source of said constant reference voltage.
- 5. 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.
- 6. A device according to claim 5, wherein said tap on said further voltage divider is fixed.
- 7. 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.
Priority Claims (2)
Number |
Date |
Country |
Kind |
51009 A/74 |
May 1974 |
ITX |
|
48126 A/75 |
Feb 1975 |
ITX |
|
REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 577,563 of Ciarniello et al. filed May 14, 1975 and entitled An Automatic Cut-Out Device, the entirety of which is incorporated herein by reference; the application has matured as U.S. Pat. No. 4,088,940 on May 9, 1978.
US Referenced Citations (5)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
577563 |
May 1975 |
|