UPS uninterruptible power supply is an important external device that can provide continuous, stable and uninterrupted power supply. It is also a power electronic device that integrates digital and analog circuits, automatic control inverters and maintenance-free energy storage devices. UPS can provide high-quality power with high voltage stabilization accuracy, frequency stabilization, and small waveform distortion to the load. Generally, the current provided by the mains is a sine wave output, but today's consumer electronic products do not need such a high-quality power supply to drive, so the analog sine wave provided by the UPS power supply has become the most common and economical choice.
The analog sine wave technology is usually carried in the entry-level UPS models, and discharges through the internal battery. Although UPS power supply manufacturers provide different forms of analog sine waves (Modified, Quasi, Stepped, PWM, etc.), the basic principles of output current are the same.
For some equipment that requires high-quality power supply, a UPS with sine wave output is required. These high-end UPSs are mainly designed for use in electronic equipment with built-in APFC power supply or small AC motors to ensure that these sophisticated electronic equipment can operate normally.