Current integrating battery charger
First Claim
1. In a battery charging circuit, current integrating means, battery charging current sense means supplying the sensed current flow through a battery being charged to said current integrating means, a current switch, control circuit means controlling said current switch in series with said battery and controlling periodic starting and resetting of said integrating means, and wherein charging current flows through the battery, the current switch and the current sense means when the voltage of the charging current exceeds the battery voltage after the start of each period, comparator means for comparing the output of the integrating means with a predetermined charging current level, said comparator means being connected to said control circuit means which open circuits said current switch and resets the integrating means when the output of the integrating means attains said predetermined charging current level.
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Abstract
The battery charger employs integrator means and current switch means in combination with a control circuit whereby the control circuit receives a synchronizing signal at the start of each cycle as determined by a cyclical supply or pulse generator as well as information about the state of the integrator means which is compared with the predetermined average current such information determining the required control signals for the integrator means and current switch means so as to maintain the value of the average charging current substantially constant throughout the charging time. Current sense means being provided to sense the current flow through battery and supply the integrator means with said sensed current.
22 Citations
8 Claims
- 1. In a battery charging circuit, current integrating means, battery charging current sense means supplying the sensed current flow through a battery being charged to said current integrating means, a current switch, control circuit means controlling said current switch in series with said battery and controlling periodic starting and resetting of said integrating means, and wherein charging current flows through the battery, the current switch and the current sense means when the voltage of the charging current exceeds the battery voltage after the start of each period, comparator means for comparing the output of the integrating means with a predetermined charging current level, said comparator means being connected to said control circuit means which open circuits said current switch and resets the integrating means when the output of the integrating means attains said predetermined charging current level.
Specification