The device for battery charge or discharge based on the technology of bidirectional converter can be used in charging or discharging battery, and realize sine wave of ac and unity power factor.
The charging technique with L-C constant-current converter is adopted, and the repeated charging and discharging process of the device is controlled by voltage feedback.
The invention supplies a chargingdevice 5y which makes the photoreceptor electrified by the voltage lower than the past and reduces discharging unevenness.