Basics of Frequency Converters

Basics of Frequency Converters

  • Description
  • Additional information


This laboratory practical utilises training panels in panel frames. The power is supplied to the frequency converter directly from the mains (mains voltage, 230 V).


  • Protective measures and electrical safety
  • Components of a frequency converter with variable voltage link
  • Setting parameters for frequency converters
  • Gaining skill in measurement techniques

This equipment set offers an insight into the circuitry of frequency converters with variable voltage link. Measurements are made on the components of a frequency converter especially designed for educational purposes. The experiments use a static electronic load, which facilitates the evaluation of current and voltage curves. A rotating field with variable frequency is also investigated. The following components can be accessed:

  • Input bridge rectifier with link capacitor
  • Brake chopper
  • Power inverter

Students work in the power engineering lab with mains voltage. Experiments procedures are contained in a printed manual.

The experiments are designed for intermediate and advanced levels.


  • Rotating field and space vectors
  • Feeding a sinusoidal signal from the normal three-phase mains network
  • Representation of space vectors
  • Generation of a rotating field from a DC voltage
  • Putting a converter into operation
  • Fault-free activation of the mains voltage
  • Activation of the input rectifier
  • Switching off the converter
  • Discharging the buffer capacitor
  • Investigation of input rectifier
  • Response with zero-delay angle setting, Cl = 00
  • Control characteristic
  • Loading
  • Control via external control voltage
  • Investigation of output inverter
  • Control of individual power transistors
  • Generation of rotating field
  • Loading with resistive load

Additional information

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