Battery charger with low heat dissipation

Details Battery charger with low heat dissipation Battery charger with low heat dissipation

1999-08-27

2000-12-12

Nguyen, Matthew

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

320 21, G05F 156, H01M 1044

Patent

active

061603899

ABSTRACT:
A battery charger (14) with low heat generation for charging exothermic batteries (12) such as NiMH batteries, as well as endothermic batteries. Energy from a power source is chopped and filtered to provide a controlled charging current. The circuit (14) includes a series switch (34), bootstrap network (56), energy storage circuit (61), and an output inductor (40) having an auxiliary winding (38). The energy storage circuit (61) supplies power to the series switch (34). The bootstrap network (56) provides a path for energy from the power source to the energy storage circuit (61). Power dissipation in the bootstrap network (56) is minimized by supplementing local energy storage with energy coupled from the auxiliary winding (38) of the inductor (40). Both variable frequency or fixed frequency modulation techniques can be employed to drive the series switch (34). Hysteretic charge current control combined with energy coupled from the output inductor (40) is one method to minimize circuit power dissipation and subsequent heat generation.

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