Frequency converter

The utility model provides a frequency converter, which comprises a driving circuit and a main control circuit. A connection terminal, an IGBT rectifier module, a switching power supply protection module, a transformer module, an optocoupler driving module, an IGBT driving module and a Hall current detection module are electrically connected in sequence to form the driving circuit. The main control circuit comprises a current detection loop module, a signal conversion module, a signal control module, a multifunctional terminal control module and a secondary wiring control module which are electrically connected in sequence. A display control module is connected with a chip control module, the chip control module is connected with the current detection loop module, and an output end of the Hall current detection module of the driving circuit is connected with an input end of the current detection loop module of the main control circuit. The frequency converter provided by the utility model strengthens the curr