The Questions of Circuitry Design when Forming the Switching Functions of the Control System of the Matrix Frequency Converter

The switching function generator of the matrix frequency converter control system is described. This device can be used in the control systems of frequency-controlled AC drives and special consumers. The output voltage of the matrix frequency converter is generated by this device on the principle of amplitude modulation of the reference sinusoid by steps that are formed from the twelve-phase input voltage sections. The described device enables to generate the output voltage in the range from extremely low frequencies up to the frequency of 150 Hz. At the same time in the low frequency region up to 15 Hz the total harmonic distortion of output voltage complies with the value specified in GOST 13109-97. The frequency range above 15 Hz requires the use of pulse-width modulation to shift the higher harmonics to the high frequency region. The device design consisting of individual identical blocks allows simplifying the manufacturing process, and applying modular technology in the manufacture and maintenance of the device itself and the entire control system in general.