In this topic, you study the Difference Between Voltage Source Inverter (VSI) and Current Source Inverter (CSI).
| Current Source Inverter (CSI) | Voltage Source Inverter (VSI) |
| CSI is more reliable. | VSI is less reliable. |
| Less rise in current when conduction of two devices in the same lag due to commutation failures. | Leads to sharp rise in the current. |
| Consists of inherent protection against short circuit across motor terminals. | No inherent protection is available. |
| High cost due to large inductance and inverter capacitors. | Less cost. |
| Large weight and volume due to inductor and capacitors. | Less in weight and volume. |
| Used for lower speed ranges. | Used for higher speed ranges. |
| Does not suitable for multimotor drives. | Used for multimotor drives. |
| Multiple CSI are used to feed a number of motor systems | A single VSI can feed a multiple number of motors connected in parallel |
Above comparison shows that
- CSI is more reliable than VSI.
- CSI drive requires large inductance in DC link and large inverter capacitors.
- Multimotor drives are supported by VSI converters.