Current-Source Input (CSI) Inverters

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The current-source input (CSI) inverter produces a voltage waveform that looks more like an ac sine wave and current waveform that looks similar to the original on/off square wave of the earliest inverters that cycled SCRs on and off in sequence. This type of inverter uses transistors to control the output voltage and current. The on-time and off-time of the transistor are adjusted to create a change in frequency for the inverter. The amplitude of each wave can also be adjusted to change the amount of voltage at the output. This means that the CSI inverter like the previous inverters can adjust voltage and frequency usable in variable-frequency motor drive applications or other applications that require variable voltage and frequency. Fig. 1 shows the voltage and current waveform for the CSI inverter.

Voltage & current waveform for the current-source input (CSI) inverter.
Above: Fig. 1: Voltage and current waveform for the current-source input (CSI) inverter.

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