Uninterruptible Power Supply Technical Indicators

Most of the inverters in the new Uninterruptible Power Supply(UPS) adopt PWM technology, and quartz crystal oscillation is used to control the frequency of the inverter, and the voltage negative feedback circuit is used to ensure the stability of the output voltage. It has a series of advantages of switching power supply. By accurately adjusting the pulse width, it ensures stable power output. At the same time, the application of switching power supply technology also greatly reduces its own loss. The main technical indicators are as follows:
(1) Rated output power and maximum output power;
(2) Switching time;
(3) Output voltage stability, reference value ±0.5%~±2%;
(4) Output frequency stability, reference value ±0.01%~±0.5%;
(5) Pure output waveform (sine wave output), voltage distortion is less than 1%, and there is no problem of latent wave distortion;
(6) High efficiency and low loss. The reference index is higher than 90%;
(7) Trouble-free working time. Due to the adoption of high technologies such as microprocessor monitoring technology and advanced IGBT-driven SPWM, the current UPS has reached an extremely high level of reliability. For large UPS power supplies, the average annual trouble-free working time (MTBF) of a single machine has exceeded 200,000 hours. If a multi-machine "redundant" UPS power supply system with dual bus output is used, its MTBF can even reach the order of 10 million hours.