Voltage checking means for an electric circuit employing two power sources
First Claim
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1. A voltage checking means comprising:
- a first power-source battery for an electric circuit, a second power-source battery for said electric circuit connected in series to said first power-source battery, a first pair of resistors connected in series with one another and connected across the terminals of said first power-source battery, a second pair of resistors connected in series with one another and connected across the terminals of said second power-source battery, a first transistor having a base electrode connected to the connecting point of said first pair of resistors, a second transistor having a base electrode connected to the connecting point of said second pair of resistors, and an indicating element connected between the collector electrodes of said first and second transistors for providing an indication in response to the voltage level of either or both of said batteries falling below a predetermined level.
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Abstract
A voltage checking means capable of properly checking powersource voltages in an electric circuit employing two power sources connected in series, said voltage checking means comprising two pairs of resistors respectively connected in series to the respective power sources, transistors respectively connected to connecting points of respective pairs of the resistors, and an indicating element connected between the collectors of said respective transistors.
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Citations
2 Claims
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1. A voltage checking means comprising:
- a first power-source battery for an electric circuit, a second power-source battery for said electric circuit connected in series to said first power-source battery, a first pair of resistors connected in series with one another and connected across the terminals of said first power-source battery, a second pair of resistors connected in series with one another and connected across the terminals of said second power-source battery, a first transistor having a base electrode connected to the connecting point of said first pair of resistors, a second transistor having a base electrode connected to the connecting point of said second pair of resistors, and an indicating element connected between the collector electrodes of said first and second transistors for providing an indication in response to the voltage level of either or both of said batteries falling below a predetermined level.
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2. A voltage checking means according to claim 1 in which said indicating element is a light-emitting diode.
Specification
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Current AssigneeYoshihiro Satake
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Original AssigneeYoshihiro Satake
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InventorsSatake, Yoshihiro
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Primary Examiner(s)Strecker, Gerard R.
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Application NumberUS05/489,713Time in Patent Office509 DaysField of Search324/51,133,140,29.5 340/248A,248B,248C,249,221 307/235US Class Current340/636.15CPC Class CodesG01R 15/04 Voltage dividersG01R 19/16542 for batteries charge condit...G01R 31/388 involving voltage measurements
