Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1975-11-06
1977-04-05
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 21, 320 35, 320 39, H02J 700
Patent
active
040164730
ABSTRACT:
A battery charger receives electrical power from an external source of direct current electrical power. The power is received through a first inductor which supplies it to a second node. First switching means receives the power from the second node and supplies it to a third node. A second inductor receives the power from the third node and supplies it to the battery to be charged through output connector means. Second switching means are connected to the second node and to a capacitor which is connected to the third node so that the second switching means can switch the capacitor between series circuit and parallel circuit configurations with respect to the first and second inductors. A safety circuit is connected to temperature sensing means positioned to sense the temperature of the battery to be charged, to the first node and to the first switching means. The safety circuit causes the first switching means to become nonconductive upon detection of unsafe conditions which may occur when charging. A control circuit is connected to the first node, to the second switching means, and to the output of the battery to be charged. The control circuit is also connected to the temperature sensing means and supplies control signals to the second switching means to repetitiously cause the capacitor to be first charged in parallel circuit through the first switching means and discharged in series circuit with said first and second inductors to pulse charge the battery to be charged and thereafter cause a brief pulse discharge of the battery to be charged with the repetition rate and magnitude of the pulses varying based on the state of charge of the battery to be charged.
REFERENCES:
patent: 3614581 (1971-10-01), Frost
patent: 3629681 (1971-12-01), Gurwicz
patent: 3775659 (1973-11-01), Carlsen
Hickey Robert J.
Utah Research & Development Co., Inc.
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