Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1994-06-24
1995-08-01
Regan, Maura K.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
320 48, 324433, G01N 27416, H02J 704
Patent
active
054382700
ABSTRACT:
A test circuit (200) furnishes a low battery level signal on the basis of a comparison between a first ratio of the battery potential when the battery (206) is unloaded and a second ratio of the loaded battery potential. The battery test circuit includes a potential divider (210), a comparator (250) and a potential sampler including a storage element (240), a controller (260), a control line (266) and a switch (268). The potential divider is coupled to the battery and includes a first tap (226) and a second tap (224). The potential sampler, which includes a storage element (240), is coupled to the first tap through a switch (268) so that a first ratiometric portion of the unloaded battery voltage is stored on the storage element. The comparator has a first input that is coupled to the storage element and a second input that is coupled to the second tap. The comparator compares the first ratiometric portion of the unloaded battery voltage to a second ratiometric portion of the loaded battery voltage and generates an output (234), which designates a battery test result, on the basis of the comparison.
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Harper Jonathan P.
Utz Hubert
Koestner Ken J.
National Semiconductor Corporation
Nelson H. Donald
Regan Maura K.
Roddy Richard J.
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