Frequency converter

The invention relates to the technical field of frequency converters, particularly provides a frequency converter, and aims to solve the problems of low voltage response speed and poor stability of an existing frequency converter. In order to achieve the purpose, the frequency converter comprises a rectifying circuit, a capacitor module and an inverter circuit, the capacitor module is arranged on a direct-current bus in parallel, the capacitor module comprises a first branch and a second branch which are arranged in parallel, and the first branch is provided with at least one first capacitor; the second branch is provided with a plurality of second capacitors which are connected in series and in parallel, and the second capacitors at least comprise super capacitors. The super capacitor has a large capacitance value, is resistant to high voltage and good in voltage stabilization effect, and facilitates the improvement of the voltage response speed of the frequency converter. And meanwhile, the second branch ci