All protection functions can be realized at lower voltages. Because there is a power frequency transformer between the inverter power supply and the load, the inverter runs stably and reliably, has strong overload capacity and impact resistance, and can suppress high-order harmonic components in the waveform. However, power frequency transformers also have the problems of being bulky and expensive, and their efficiency is relatively low. The rated load efficiency of the small power frequency inverter manufactured according to the current level generally does not exceed 90%. At the same time, the iron loss of the power frequency transformer is basically unchanged when the power frequency transformer operates under full load and light load, so it can be operated under light load. The no-load loss is larger and the efficiency is lower.

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