Step-up transformer means to start the voltage instantaneously, and the step-up transformer instantaneously starts the step-up ability and the step-up effect is better. The difference is that the non-excitation voltage regulating switch does not have the ability to switch gears with load, because this kind of tap switch has a short-term disconnection process during the shifting of the gears, and disconnecting the load current will cause arcing between the contacts. The tap switch is broken or short-circuited, so the transformer must be powered off when adjusting gears. Therefore, it is generally used for transformers that do not require very strict voltage requirements and do not need to be adjusted frequently. Transformer is a common electrical equipment that can be used to transform a certain value of alternating voltage into another value of alternating voltage with the same frequency. A step-up transformer is a transformer used to transform a low-value alternating voltage into another higher-value alternating voltage with the same frequency. It is widely used in high-frequency fields, such as inverter power supplies.