Tianjin Inverter Power Supply Quotation, Tianjin Inverter Power Supply Factory Phone, Tianjin Inverter Power Supply Wholesale. An inverter power supply transforms AC to DC and then back to AC, outputting a pure sine wave with adjustable frequency and voltage within a certain range. It differs from variable frequency speed controllers used for motor speed control and from standard AC voltage regulators. An ideal AC power supply is characterized by stable frequency and voltage, zero internal resistance, and a pure sine wave voltage waveform (no distortion). Inverter power supplies are very close to ideal AC power supplies, which is why more and more advanced and developed countries are using them as standard power supplies to provide excellent power supply conditions for electrical appliances and facilitate objective assessment of their technical performance. There are mainly two types of inverter power supplies: linear amplifying type and SPWM switching type.