Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1987-07-02
1988-03-22
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
307108, 307109, H03K 706, H02M 700, H03G 300
Patent
active
047331534
ABSTRACT:
First and second switches such as transistors are connected to a charge storage member such as a capacitance. The capacitance is charged through the first transistor from a positive supply when the transistor becomes conductive. The capacitances is discharged through the second transistor to a reference potential such as ground when the second transistor becomes conductive. The conductivities of the first and second transistors are controlled by pulses from a pulse source such as a transformer. The transformer primary produces a pulse of one polarity upon the occurrence of the leading edge of an input signal and a pulse of an opposite polarity upon the occurrence of the trailing edge of the input signal. Two secondary windings are respectively connected in opposite polarities to the bases of the first and second transistors to provide for the conductivity of only one of the transistors at any one time. The transformers saturate the conductive transistor to prolong on a limited basis the time during which the transistor remains conductive. The other one of the transistors is made instantaneously non-conductive by providing for an instantaneous discharge of the stored base charge between the base and emitter of the transistor. A constant current source is electrically in parallel with the first transistor to sustain the capacitance charge at a high level after the limited period of time in which the first transistor remains conducitive. A low frequency transistor is connected in parallel with the second transistor to sustain the discharge of the capacitance after the limited period of time in which the second transistor remains conductive.
REFERENCES:
patent: 4455526 (1984-06-01), Miller
patent: 4546268 (1985-10-01), Caldwell et al.
patent: 4553082 (1985-11-01), Nesler
patent: 4555655 (1985-11-01), Tanaka
patent: 4577166 (1986-03-01), Milberger et al.
patent: 4586118 (1986-04-01), Mihalka
patent: 4665476 (1987-05-01), Masuda
Brooktree Corporation
Hickey R. J.
Roston Ellsworth R.
Schwartz Charles H.
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