Temperature compensated battery charging system with testing for battery back-up system
First Claim
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1. A temperature compensated circuit for charging and testing a back-up battery of an external system, comprising:
- input terminals adapted for connection to a source of unregulated voltage;
output terminals adapted for connection to a load, said output terminals connected to said input terminals;
means for regulating the source voltage, said means connected across said input terminals, said means producing a regulated voltage;
a test load;
first switching means for conducting a charging current, said first switching means said test load and the battery being series connected across said input terminals;
a temperature variable resistance, said resistance cooperating with said regulated voltage to produce a control current regulating the conduction of said first switching means;
second switching means for electrically grounding said charging current in response to a signal generated by the external system, said second switching means electrically connected in parallel with the series combination of said battery and said test load such that when said charging current is grounded said test load is electrically connected across said battery; and
means for reading the battery voltage, said battery connected to said output terminals such that said battery voltage is available at said output terminals in the event said source voltage fails.
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Abstract
A battery charging circuit for continuously charging a back-up battery is disclosed. A switch conducts a charging current to the battery in response to a temperature variable resistor. The charging current is a function of both the temperature and the battery voltage such that the charging current is matched to the charging characteristics of the battery. Additional features include the establishment of a minimum charging current and the capability of testing the battery under load conditions.
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Citations
14 Claims
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1. A temperature compensated circuit for charging and testing a back-up battery of an external system, comprising:
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input terminals adapted for connection to a source of unregulated voltage; output terminals adapted for connection to a load, said output terminals connected to said input terminals; means for regulating the source voltage, said means connected across said input terminals, said means producing a regulated voltage; a test load; first switching means for conducting a charging current, said first switching means said test load and the battery being series connected across said input terminals; a temperature variable resistance, said resistance cooperating with said regulated voltage to produce a control current regulating the conduction of said first switching means; second switching means for electrically grounding said charging current in response to a signal generated by the external system, said second switching means electrically connected in parallel with the series combination of said battery and said test load such that when said charging current is grounded said test load is electrically connected across said battery; and means for reading the battery voltage, said battery connected to said output terminals such that said battery voltage is available at said output terminals in the event said source voltage fails. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification