As shown in the illustration, what is the purpose of the DC link within the frequency converter? See illustration EL-0030.
It merely provides a conducting path between the bridge rectifier output to the controlled inverter input with no other purpose.
It is an inductor coil that smooths out the DC current flow outputting from the bridge rectifier on the way to the controlled inverter input.
It converts the bridge rectifier AC output to the DC required for input to the controlled inverter.
It controls the gate trigger pulses to the controlled inverter, thus controlling the output frequency.
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