Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-06-21
1996-01-23
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 10, 320 5, H02K 718, H02P 300
Patent
active
054867495
ABSTRACT:
A battery charging system is disclosed that includes an efficient switch mode power supply, multiple linear current limiters, and feedback means to allow the switch mode power supply to operate at the minimum voltage necessary to operate a power load and charge batteries. Furthermore, the switch mode power supply is capable of producing the maximum power required by the system, such as when the battery charger is used in conjunction with operation of a electronic device with peak load demands such as when a hard disk is accessed in a portable computer. Two control mechanisms are found in the battery charging system. The first mechanism is an input used to control the switch mode power supply output voltage from an external source. In one embodiment, this is done by referencing a first voltage to that internal to the switch mode power supply. The second mechanism is to limit the current within the switch mode power supply not controlled by an external source. This current limiting feature is linear and is set at an absolute limit point. Each limiter supplies charge current to a battery, which charge current is monitored and compared to a reference voltage with the resulting error voltage used to control the output of a series pass controller, such as a transistor.
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AST Research Inc.
Ponomarenko Nicholas
Stephan Steven L.
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