The UV variable frequency power supply transforms the alternating current in the mains from AC→DC→AC, and the output is a pure sine wave. The output frequency and voltage are adjustable within a certain range. It is different from the frequency conversion speed controller used for motor speed control, and it is also different from the ordinary AC stabilized power supply. The ideal AC power supply is characterized by stable frequency, stable voltage, zero internal resistance, and a pure sine wave (no distortion) in the voltage waveform. The variable frequency power supply is very close to the ideal AC power supply. Therefore, in advanced developed countries, the variable frequency power supply is increasingly used as the standard power supply in order to provide the best power supply environment for the electrical appliances and facilitate the objective assessment of the technical performance of the electrical appliances. There are two main types of variable frequency power supplies: linear amplifier type and SPWM switch type.
Uninterruptible power supply is a system equipment that connects storage batteries (mostly lead-acid maintenance-free storage batteries) to the host, and converts DC power into mains power through a module circuit such as the host inverter. It is mainly used to provide a stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as solenoid valves, pressure transmitters, etc. When the mains input is normal, the UPS will stabilize the mains and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery inside the machine; when the mains is interrupted (accidental power failure) Immediately, the UPS will continue to supply 220V AC power to the load through the inverter zero-switching conversion method from the battery's DC power, so that the load can maintain normal operation and protect the load's software and hardware from damage. UPS equipment usually provides protection against over-voltage or under-voltage.
