Voltage Source Inverter ( VSI ) – Current Source Inverter ( CSI )
- The output voltage remains constant for a given type of load in the VSI whereas the input current remains constant in the CSI.
- A large capacitor is connected at the input side of the VSI whereas a large inductor is connected at the input side of the CSI.
- The input voltage source should be short circuited due to misfiring of the switching semiconductor device in the VSI whereas there is not any effect in the CSI.
- The maximum current in the switching semiconductor device depends upon circuit condition in the VSI whereas the maximum current is limited in the CSI due to constant current.
- The SCR commutation circuit in the CSI is much simpler than that of the VSI.
- There is necessary of freewheeling diode in the VSI for the inductive type load whereas it is not necessary in the CSI due to constant input current.
- There is not necessary any converter in the VSI in order to control input voltage whereas a converter is necessary to control input current in the CSI.
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