Constant power dissipation control of a linear pass element used

Details Constant power dissipation control of a linear pass element used Constant power dissipation control of a linear pass element used

1995-04-20

1996-11-19

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 32, 320 53, H02J 710

Patent

active

055766099

ABSTRACT:
A battery charger including a control system for controlling a linear pass element to maintain relatively constant power dissipation of the linear pass element. In one embodiment, the charge current and the voltage across the linear pass element are provided to a constant dissipation amplifier, which increases the charge current as the voltage of the linear pass element decreases due to charging of the battery. The charge current is increased in such a manner to maintain the power dissipation of the linear pass element to a relatively constant level. In another embodiment, the battery voltage is provided to the amplifier, which increases charge current in response to rising battery voltage to maintain constant power dissipation of the linear pass element. The latter embodiment is in recognition that the voltage across the linear pass element is inversely proportional to the voltage across the linear pass element. Furthermore, the power dissipation may be decreased towards the end of the charge cycle if a particular maximum charging current is desired, such as, for example, to maintain a trickle charge.

REFERENCES:
patent: 4472672 (1984-09-01), Pacholok
patent: 4504951 (1985-03-01), McMahan et al.
patent: 4644247 (1987-02-01), Burmenko

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