Vacon Oyj

Vacon Oy

Kimmo Rauma

Stefan Strandberg

Magnus Hortans

Hannu Sarén

Toni Itkonen

Jorma Vesti

Juha-Pekka Ström

Mika Ikonen

The shape of the rising and falling edges of AC output voltage pulses of a PWM frequency converter is controlled by reducing a speed of change, and a height, of the AC output voltage pulse. The PWM frequency converter rectifies the alternating voltage of a supply network into a DC voltage which is filtered. A load bridge having power semiconductor phase switches forms an AC output voltage from the DC voltage for controlling the load. An average speed of voltage change of AC output voltage pulses is set using a phase switch to control at least one power component to be conductive and non-conductive in turn for a period of at least about one microsecond to change a pulse edge of the AC output voltage pulses into at least one micropulse, the width of which is controlled to increase towards a final state of the phase switch.

Frequency converter voltage pulse shaping device and method

A method and a parallel connection arrangement for equalizing the output powers of power converter units (INU, INU), in which power converter units is a semiconductor switch bridge controlled with pulse width modulation, and in which is a control unit arrangement (CU, CU) for forming control pulses, with which the semiconductor switches are controlled. The control unit arrangement delays the falling edge of the control pulses of at least one semiconductor switch of at least one power converter unit.

Power level balance of frequency converters connected in parallel

Growing community of inventors

Vaasa, Finland

Kimmo Rauma