UPS - J power supply belongs to uninterrupted power supply that has high efficiency, small volume, nice appearance, advanced and reliable performance specially designed for microcomputer system and precise electronic instrument. When the commercial power is normal, it outputs voltage stabilized AC power supply; When the power fails or the voltage is too low or too high, the inverter powered by battery outputs AC to load in 10 ms. During battery supplying power, if the commercial power resumes, the inverter in the machine will stop inverting immediately and the commercial power restore into use; The battery is charging at the same time.