Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1991-04-29
1993-11-30
Peckman, Kristine L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
363 18, H02J 700
Patent
active
052668819
ABSTRACT:
A high current battery charger of the driven blocking oscillator type includes a three-winding transformer. The primary winding is connected in series with the collector-emitter path of a switching power transistor. The secondary winding is connected in series with the collector-emitter path of a sense transistor which responds to the current flowing through the switching power transistor. The tertiary winding is connected in series with the battery, series-connected batteries or series-connected battery packs sought to be recharged, via a diode, which may be connected in parallel with a capacitor. The battery or batteries are charged by current pulses and discharge through the tertiary winding to repolarize the diode (and capacitor if present). The secondary winding is poled, with respect to the tertiary winding so that the blocking oscillator is driven by energy from the battery or batteries. The battery charger can operate over a wide range of input voltages with high efficiency, making it useful worldwide. The high current charger is effective to charge batteries over a wide range of battery voltages. The high current charger will only function if at least one rechargeable battery is in circuit for charging.
REFERENCES:
patent: 3958168 (1976-05-01), Grundberg
patent: 4376263 (1983-03-01), Pittroff et al.
patent: 4591777 (1986-05-01), McCarty et al.
patent: 4680687 (1987-07-01), Stasch et al.
patent: 4706009 (1987-11-01), Schwarz
patent: 4710695 (1987-12-01), Yamada et al.
patent: 4777424 (1988-10-01), Sakamura et al.
Frey Douglas
Hoffman Philip K.
Bloom Leonard
Peckman Kristine L.
Solid State Chargers Research and Development Limited
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