Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-12-18
1988-04-12
Salce, Patrick R.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 5, 320 21, 320 23, 320 33, 320 36, H02J 704
Patent
active
047377020
ABSTRACT:
In a preferred embodiment, a closed loop control system of a hand held data processing device varies the duty cycle of a battery charging source to match a desired charge rate. Such desired charge rate may be selected according to ambient temperature, for example. A variable duty cycle voltage waveform may energize an inductance such that battery current builds up and decays in each operating cycle. The resulting periodically fluctuating battery current may be sampled at successive sampling points in respective widely separated operating cycles and the samples summed to obtain a measure of actual battery charging current. With each new sample, a revised average may be obtained and used to correct the duty cycle of the energizing voltage as needed to maintain the desired charge rate. The current sampling means may also be used to obtain a measure of battery discharge current during a deep discharge conditioning of the battery and during portable operation so that the hand held device may compute and display remaining battery capacity whenever desired during use.
REFERENCES:
patent: 3775659 (1973-11-01), Carlsen, II
patent: 4472672 (1984-09-01), Pacholok
Ault Anita M.
Norand Corporation
Salce Patrick R.
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