Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1994-08-17
1997-02-04
Wieder, Kenneth A.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
320 48, 340636, G01N 27416
Patent
active
056002475
ABSTRACT:
A battery detect circuit (32) is provided that is operable to dispose a sense resistor (50) in series with the battery to determine whether the charge is being provided to the battery or being extracted from the battery. The voltage across the sensor resistor (50) is sensed by a voltage/frequency converter (52). The voltage/frequency converter (52) is a differential structure comprised of two integrator structures (102) and (104) that are operable to utilize a switched capacitor configuration to drive comparators on the output thereof. Each of the integrator structures (102) and (104) has associated therewith passive elements and active elements. The integrators (102) and (104) have associated therewith integration capacitors (147) and (149). Additionally, there are two operational amplifiers (143) and (145) that provide the active components of each of the integrators (102) and (104). The various switched capacitor circuits (161) and (163) associated with the amplifiers (143) and (145) are provided to provide the integration operation. Both the amplifiers (143) and (145) and their associated switched capacitor circuits (161) and (163) are dynamically balanced such that they are switched between integrator (102) and integrator (104) on a periodic basis. This therefore allows the errors between the active and passive elements to be switched between the two integrators (102) and (104) such that no accumulative error occurs.
REFERENCES:
patent: 4820966 (1989-04-01), Fridman
patent: 5179340 (1993-01-01), Rogers
patent: 5254952 (1993-10-01), Salley et al.
patent: 5284719 (1994-02-01), Landau et al.
patent: 5357203 (1994-10-01), Landau et al.
patent: 5454710 (1995-10-01), Landau et al.
Benchmarq Microelectronics
Brown Glenn W.
Howison Gregory M.
Wieder Kenneth A.
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