Test circuit for back-up battery
First Claim
1. A test circuit for a battery which backs-up and has lower rated voltage than a main power source, said circuit comprising:
- an input port for connection to the main power source;
an output port for connection to a load;
a main switch connected between the input and output ports;
a battery connection port coupled to said output port; and
means for turning off said main switch at a start of a battery test interval, supplying said load from said battery beginning at the start of and continuing during said battery test interval and determining if said battery supplies said load with at least a predetermined threshold voltage for the duration of said battery test interval, in which case said battery passes a test.
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Accused Products
Abstract
A test circuit for a back-up battery includes a main switch which connects a main power source to a load, and a diode which is interposed between a back-up battery and the load. The diode is reversed biased when the main power source supplies rated power to the load. To test the battery, the main switch is turned off such that the back-up battery supplies operating current to the load via the diode. During a test interval, the output voltage is monitored to determine if the battery is able to supply its rated voltage under load. After the test or if the battery fails to supply requisite voltage, the main switch is turned-on again.
33 Citations
18 Claims
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1. A test circuit for a battery which backs-up and has lower rated voltage than a main power source, said circuit comprising:
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an input port for connection to the main power source; an output port for connection to a load; a main switch connected between the input and output ports; a battery connection port coupled to said output port; and means for turning off said main switch at a start of a battery test interval, supplying said load from said battery beginning at the start of and continuing during said battery test interval and determining if said battery supplies said load with at least a predetermined threshold voltage for the duration of said battery test interval, in which case said battery passes a test. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for testing a battery which backs-up and has lower rated voltage than a main power source, said method comprising the steps of:
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closing a switch and supplying drive current from the main power source to a load via the closed switch during normal operation; and opening said main switch at a start of a battery test interval, supplying drive current from the battery to said load beginning at the start of and continuing during said battery test interval and determining if said battery supplies said load with at least a predetermined threshold voltage for the duration of said battery test interval, in which case said battery passes a capacity test. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification