Bidirectional IGBT switches enable the matrix

Dynex Semiconductor has released a pair of bidirectional IGBT modules for use in matrix convertor power stages.

Dynex Semiconductor has released a pair of bidirectional IGBT modules for use in matrix convertor power stages.

A matrix convertor is a fully controllable array of switches that allows a variable frequency multiphase supply to be created from a fixed frequency multiphase input.

The mode of operation is similar to the well established cyclo convertor but a much higher quality output waveform can be achieved because of the fully controllable switches implemented by IGBTs.

By using high-frequency PWM it is possible to achieve variable frequency sinusoidal output waveforms.

The attraction of the matrix convertor stems from the absence of any DC link rectifier diodes or decoupling capacitors.

The latter are bulky, unreliable and relatively expensive.

The only downside is slightly increased conduction losses due to the series connection of IGBT and diodes in each bidirectional switch.

Peak performance from a matrix convertor depends on optimum PWM strategy and appropriate sizing of the switch elements.

Dynex Semiconductor is working closely with researchers at Nottingham University, UK.

Through this collaboration and in response to commercial requirements, Dynex has created the DIM400PBM17-A000 for use in a 60Hz to 400Hz fixed-frequency convertor and the GP200MBS12 for use in a high-efficiency brushless DC motor drive.

The DIM400PBM17-A000 module is a 400A 1700V bidirectional switch mounted on a 140 x 73mm metal matrix baseplate.

Long-term reliability and enhanced thermal performance are achieved through the use of aluminium nitride substrates mounted on a metal matrix compound baseplate.

The package has a 6kV isolation rating.

The DIM200MBS12-A000 module is a 200A 1200V bidirectional switch mounted on a 106 x 62mm copper baseplate.

The package has a 4 kV isolation rating.

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