Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1990-11-30
1992-05-05
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 20, H02J 700
Patent
active
051111314
ABSTRACT:
A low noise battery charger includes a rectifier to convert AC line voltage to a rectified sinusoidal voltage that is applied to a primary winding of a transformer. Another rectifier coupled to a first secondary winding applies a charging current to a battery. A switch coupled in series with the primary winding controls current therein. A rectifier coupled to another secondary winding produces a battery condition voltage. An incrementing signal synchronized with the rectified sinusoidal voltage increments a ratchet DAC until its output voltage exceeds the battery condition voltage. A low charging mode signal is produced when the battery condition voltage falls a certain amount below the DAC output voltage. Flow of current through the primary winding is controlled by operating the switch at a relatively high frequency and by producing constant turn off times for the switch and also by modulating turn on times for the switch in response to the signal indicative of primary winding current. Maximum power transfer across the transformer is thereby achieved without flyback voltage of the transformer exceeding breakdown voltage of the switch, and zero current switching is achieved.
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"Fast-Charging Systems for Ni-Cd Batteries", by David A. Zinder, Design Ideas, 1970, pp. 65-67.
Burr-Brown Corporation
Dougherty Thomas M.
Stephan Steven L.
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