Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-04-21
1987-09-08
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 21, 320 51, 331181, 323347, H02J 700
Patent
active
046926810
ABSTRACT:
A battery charger comprises a self-oscillating inverter with saturable transformer means in its positive feedback circuit. The saturation flux density of the magnetic material used in this saturable transformer means determines the frequency of inverter oscillation. A permanent magnet is rotatably mounted adjacent the saturable transformer means and is used by way of cross-magnetization to adjustably affect the saturation flux density of the magnetic material, thereby correspondingly to adjust the frequency of oscillation: the more cross-magnetizing flux provided to the magnetic material from the permanent magnet, the smaller the saturation flux density and the higher the frequency of oscillation.
The battery charging current is attained from the inverter's squarewave voltage output by way of a series-excited parallel-loaded tuned L-C circuit, thereby providing for a battery charging current of magnitude dependent upon the frequency of inverter oscillation. Thus, by adjusting the position of the permanent magnet, the magnitude of the battery charging current can be adjusted over a wide range. In fact, in one of its extreme positions, the permanent magnet is operative to disable the inverter's self-oscillation, thereby entirely cutting off the charging current.
REFERENCES:
patent: 2029628 (1936-02-01), Lord
patent: 3803475 (1974-04-01), Anichini
patent: 4217541 (1980-08-01), Weintraub et al.
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