Patent ID: 6806686
Filing Date: 2004-10-19
Classification: H02J

Abstract:
A charge balancing circuit for providing charge balancing for at least two charge storage devices connected in series, the at least two charge storage devices capable of being charged by a supply voltage, the charge balancing circuit comprising:a voltage divider for equally dividing the supply voltage across the at least two charge storage devices; an operational amplifier having inputs and an output, the operational amplifier being connected at its output between each at least two charge storage devices and the operational amplifier being connected to the voltage divider such that the voltage divider provides a voltage to an input of the operational amplifier; a negative, feedback resistor for providing feedback regarding a stored voltage in each of the at least two charge storage devices to an input of the operational amplifier; wherein the operational amplifier is configured to produce an output current when the stored voltage of a first of the at least two charge storage devices is higher than the stored voltage of a second of the at least two charge storage devices, the output current causing energy stored in the first charge storage device to be transferred to the second charge storage device until the at least two charge storage devices are balanced.