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The special circuit architecture is bi-lateral converter and AVR(auto voltage regulation), The bi-directional have the features of charger and DC / AC, this charger is similar to the quick-charge device which can reduce charging time from 7 to 8 hours to 2 ~ 4 hours, so the efficiency is higher than general charger. In the AVR , a transformer with Boost and Buck features, when the microprocessor detects the voltage is low, AVR will automatically switch to boosting coil using of relay, otherwise, achieve a stable output voltage through this way.