ABSTRACT
Impedance source inverter (ZSI) is a new approach to DC/AC conversion technology. The ZSI circuit consists of an x-shaped impedance network formed by two capacitors and two inductors, and it provides unique buck–boost characteristics. Switches used in ZSI can be a combination of switching devices and diodes. The advantages of the ZSI are ZSI is a new inverter different from traditional voltage source inverter and current source inverter devices. ZSI has an anti-noise function. The shoot-through problem by electromagnetic interference noise misgating on will not damage the device or the converter’s reliability. The inverter bridge is equivalent to a short circuit when the inverter bridge is in the shoot-through zero state. All the traditional pulse width modulation schemes can be used to control the Z-source inverter, and their theoretical input–output relationships hold. The Z-source network makes the shoot-through zero state possible. This shoot-through zero state provides the unique buck–boost feature to the inverter.
