Patent ID: 6433510
Filing Date: 2002-08-13
Classification: H02J

Abstract:
A control circuit for controlling a charge current of batteries, comprising an input/output circuit disposed between a pole of a battery charger and a pole of a battery, the I/O circuit comprising a transconductance operational amplifier having a first input coupled to the pole of the battery and a second input coupled to the pole of the battery charger, a driver circuit, and an output stage comprising a first transistor having a first electrode connected to the pole of the battery and having a second electrode connected to a second electrode of a second transistor, the second transistor also having a first electrode connected to the pole of the battery charger, wherein the second transistor is controlled by the driver circuit and the first transistor is controlled by the transconductance operational amplifier so to increase a value of a total resistance of the output stage as a function of a voltage difference between the pole of the battery charger and the pole of the battery.