Charging voltage control and current limit for battery chargers

Details Charging voltage control and current limit for battery chargers Charging voltage control and current limit for battery chargers

1991-09-23

1993-03-09

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H02J 104

Patent

active

051929058

ABSTRACT:
Charging voltage and current control circuits for battery chargers provide for a constant output voltage above a predetermined value of charging current and a step-wise increased output voltage below the predetermined value of charging current. The charger makes use of a pulse-width modulated control circuit utilizing a variable duty cycle to control charging current and couples a trim command signal responsive to a primary side signal representative of charging current to the pulse-width modulator for values below the predetermined value of charging current. A current limit control circuit provides a foldback current limit function by driving the pulse-width modulator to a reduced output current during overload conditions.

REFERENCES:
patent: 3816806 (1974-06-01), Mas
patent: 3864617 (1975-02-01), Smith et al.
patent: 3900784 (1975-08-01), Seike
patent: 4209736 (1980-06-01), Reidenbach
patent: 4233553 (1980-11-01), Prince, Jr. et al.
patent: 4243929 (1981-01-01), Lenart

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