I. Main Features of Standby UPS Power Supplies
Power range: 300～2000VA
Operating characteristics: The mains power is directly supplied to the load after simple step-up/step-down and filtering. Battery power is only supplied when the input power does not meet the requirements. Most of the time, the load is powered by mains power or by a power source that has undergone simple processing.
Advantages: Low cost, fewer components, small size, high efficiency. Disadvantages: AC/battery power conversion time: 4-10ms.
Low output accuracy, poor output waveform, and the output waveform is a square wave.
Main application: Power outage protection for single computer systems
Working principle diagram of a standby UPS power supply when the mains power is abnormal and the battery is working.
II. Main Features of Double Conversion Online UPS
Power range: 1~800KVA
Operating characteristics: The mains power is rectified and converted into DC, and then modulated into a stable sine wave by the inverter.
Advantages: The load end and the mains input end are in a state of excellent "electrical isolation", the output waveform is good, the output voltage quality is high, and it exhibits excellent load-carrying characteristics regardless of whether the load changes suddenly or is stable.
Disadvantages: Low efficiency and high cost. Main applications: computer and network systems, precision instruments and meters, power failure protection for industrial systems. This product is currently widely used.
Working principle diagram of a double-conversion online UPS power supply when the mains power is abnormal and the battery is working.
