Ups uninterrupted power supply

UPS power supply is uninterrupted power supply. When the normal AC power supply is interrupted, it converts the DC output from the battery into a power supply device with continuous AC power supply. It is mainly used to provide uninterrupted power supply to a single computer, computer network system or other power electronic equipment. When the mains input is normal, UPS? After the mains voltage is stabilized, it is supplied to the load. At this time, UPS is the AC mains voltage regulator, and it also charges the battery in the machine. When the power supply is interrupted (emergency power failure), UPS? Immediately, the electric energy of the battery in the machine will continue to provide 220V alternating current to the load through inverter conversion, so as to keep the load working normally and protect the hardware and software of the load from being damaged. UPS？ Equipment usually provides overvoltage and undervoltage protection.

UPS power system consists of five parts: main circuit, bypass, battery and other power input circuits, rectifier (rec) for AC /DC conversion, inverter (inv) for DC/ AC conversion, inverter and bypass output switching circuit and energy storage battery. The voltage stabilizing function of the system is usually completed by rectifier. The rectifier device adopts silicon controlled rectifier or high frequency switching rectifier, which has the function of controlling the output amplitude according to the change of external power supply, so that when the external power supply changes (the change should meet the requirements of the system), the rectified voltage with basically constant amplitude is output.

The purification function is completed by the energy storage battery. Because the rectifier can't eliminate the interference of instantaneous pulse, there are still interference pulses in the rectified voltage. In addition to the function of storing DC direct energy, the energy storage battery is like connecting a large-capacity capacitor to the rectifier, and its equivalent capacitance is proportional to the capacity of the energy storage battery. Because the voltage at both ends of the capacitor can't change suddenly, the smoothing characteristics of the capacitor are used to eliminate pulse interference and play a purification role, which is also called shielding interference. Frequency stabilization is completed by the frequency converter, which depends on the stability of the oscillation frequency of the frequency converter. In order to facilitate the daily operation and maintenance of UPS power supply system, the switching control of system working switch, automatic bypass switch after self-check failure of main engine and overhaul bypass switch are designed.