CHARGE BALANCING CIRCUIT FOR DOUBLE-LAYER CAPACITORS

A charge balancing circuit is configured to provide charge balancing for a bank of series connected charge storage devices. One embodiment of the charge balancing circuit comprises a voltage divider, an amplifier, and a negative feedback resistor connected between every two capacitors. The circuit i...

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Bibliographische Detailangaben
Hauptverfasser:	THRAP, GUY, C, GALLAY, ROLAND, SCHLUNKE, DANIEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	A charge balancing circuit is configured to provide charge balancing for a bank of series connected charge storage devices. One embodiment of the charge balancing circuit comprises a voltage divider, an amplifier, and a negative feedback resistor connected between every two capacitors. The circuit is configured to monitor the voltage in each of the capacitors and, if the voltage in one of the capacitors is higher than the other, the circuit transfers energy from the higher charged capacitor to the lower charged capacitor until the capacitors are balanced. A current limiting resistor can be included for limiting the output current of the amplifier to a safe value and for providing feedback information regarding the health of the capacitor. An additional gain stage can also be included for increasing the output current of the amplifier for banks of large charge storage devices. The circuit can be used in bi-polar applications.