Battery charging apparatus capable of completely charging second

Details Battery charging apparatus capable of completely charging second Battery charging apparatus capable of completely charging second

1993-10-20

1995-03-07

Peckman, Kristine L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H02J 710

Patent

active

053961641

ABSTRACT:
Battery charging apparatus is provided between a power source and a secondary cell which charges the secondary cell by direct current (DC) power. The apparatus includes a power generation circuit for generating the DC power, a pulse generation circuit for generating a pulse voltage having a predetermined cycle, a first voltage level and a second voltage level, each continuing for a predetermined period after the start of the supply of the DC power. A switch selectably connects the DC power such that the DC power is supplied to the secondary cell while the pulse voltage is at the first voltage level, and interrupts the supply of the DC power to the secondary cell while the pulse voltage is at the second voltage level. A detection circuit detects the voltage of the secondary cell to check the remaining capacity of the secondary cell while the supply of the DC power to the secondary cell is interrupted. A control element which is controlling the charging operation, stops the charging of the secondary cell by setting the pulse voltage to the second voltage level when charging is determined to be sufficient, on the basis of the detected voltage of the secondary cell.

REFERENCES:
patent: 3781631 (1973-12-01), Nelson et al.
patent: 4321523 (1982-03-01), Hammel
patent: 4354148 (1982-10-01), Tada et al.
patent: 5214369 (1993-05-01), McCrea

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