Charge equalization apparatus
First Claim
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1. A charge equalization apparatus, comprising:
- N transformers connected in parallel to N respective series-connected batteries, and configured to store energy discharged from overcharged batteries among the N batteries and to charge batteries other than the overcharged batteries with the stored energy;
N charge control switches each connected between both ends of each of the N transformers;
a redistribution switch connected between a common node of a primary winding of an Nth of the transformers and an Nth of the charge control switches and a ground;
N first semiconductor switching elements connected in series to respective secondary windings of the N transformers; and
a voltage detection and drive signal generation unit configured to detect respective voltages of the N series-connected batteries, and to generate a first drive signal and a second drive signal for driving the charge control switches and the redistribution switch based on the detected voltages.
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Abstract
The present invention relates to a charge equalization apparatus, which allows the primary and secondary windings of a transformer to be easily fabricated, can control the flow of charge to batteries depending on the charged states of series-connected batteries, and can prevent overcurrent from flowing into a battery currently being charged.
26 Citations
10 Claims
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1. A charge equalization apparatus, comprising:
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N transformers connected in parallel to N respective series-connected batteries, and configured to store energy discharged from overcharged batteries among the N batteries and to charge batteries other than the overcharged batteries with the stored energy; N charge control switches each connected between both ends of each of the N transformers; a redistribution switch connected between a common node of a primary winding of an Nth of the transformers and an Nth of the charge control switches and a ground; N first semiconductor switching elements connected in series to respective secondary windings of the N transformers; and a voltage detection and drive signal generation unit configured to detect respective voltages of the N series-connected batteries, and to generate a first drive signal and a second drive signal for driving the charge control switches and the redistribution switch based on the detected voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification