Z-source inverter circuit, circuit board, controller and air conditioner

The invention discloses a Z-source inverter circuit, a circuit board, a controller and an air conditioner, the Z-source inverter circuit comprises an X-type impedance network, an IPM module and a buffer module, the X-type impedance network comprises a first inductor, a second inductor, a first capacitor and a second capacitor, the IPM module comprises a plurality of bridge arms connected in parallel, the buffer module comprises a third capacitor and a fourth capacitor which are connected through a plurality of diodes, and the third capacitor and the fourth capacitor are used for forming an energy absorption loop connected with the two ends of the bridge arm and are connected with the first capacitor and the second capacitor through corresponding buffer resistors to form an energy discharge loop; a third capacitor and a fourth capacitor in the buffer module can absorb energy of an IPM bridge arm switch tube and are connected with a first capacitor and a second capacitor in the X-type impedance network through a buffer resistor to release energy after the bridge arm switch tube is in a steady state, so that the peak voltage is reduced, and the working stability and the overall energy efficiency of the Z-source network system are improved.