The Sparse Matrix Converter is a new kind of AC/AC converter with a reduced number of components and a modulation scheme of low complexity and realization effort. Sparse Matrix Converters avoid the multi-step commutation procedure of the conventional matrix converter which could impair the system's reliability and therefore its suitability for operation in an industrial environment. Compared to the Direct Matrix Converter, this topology provides identical functionality, but with a reduced number of power switches and the option of employing an improved zero DC link current commutation scheme, which provides lower control complexity and higher safety and reliability. The commutation scheme can be studied in this applet.

• Current iA is flowing in the DC link, the DC link voltage is equal to u_ac. Now click 'Next Step' to switch-on the upper transistor of B. The current iB is commutated accordingly.
• 'Next Step': Switch on the upper transistor of phase C. Now there is no current in the DC link, the DC link voltage is still u_ac.
• 'Next Step': With no current at the input side, you can switch on the lower transistors of phase b and switch off the lower transistors of phase c. This changes the DC link voltage to u_ab.
• 'Next Step': Switch on the lower switch of phase C. DC link current is now equal to -iC, and current flows in the input stage.
• 'Next Step': Switch on the lower switch of phase B. DC link current is equal to iA again, but the DC link voltage was changed from u_ac to u_ab. During the commutation there was no current flow in the input stage.
• Click 'Reset' any time to start the sequence again.