Unit cascaded type frequency converter based on DSP (digital signal processor) and FPGA (field programmable gate array)

Abstract

The invention discloses a unit cascaded type frequency converter based on a DSP (digital signal processor) and an FPGA (field programmable gate array). The unit cascaded type frequency converter based on the DSP and the FPGA comprises a main circuit, the DSP and the FPGA, wherein the DSP is used to receive input frequency from a keyboard and calculate a modulation degree, and furthermore sends modulated wave frequency and a voltage modulation degree to the FPGA through a special SPI (serial peripheral interface), the FPGA is used to generate an SPWM (sinusoidal pulse width modulation) signal according to the modulated wave frequency and the voltage modulation degree, which are input, so as to control connection and disconnection of a power pipe in the main circuit, the main circuit comprises a phase shifting transformer and n power modules which are cascaded, and n is an integer, and larger than or equal to 3. The unit cascaded type frequency converter based on the DSP and the FPGA can flexibly adjust carrier frequency, the modulating wave frequency and the modulation degree, is rapid in respond, and can effectively guarantee speed regulation performance of the unit cascaded type frequency converter based on the DSP and the FPGA.

Description

technical field [0001] The invention relates to a unit cascade frequency converter based on DSP and FPGA. Background technique [0002] With the strengthening of people's awareness of energy saving and environmental protection, the application of frequency converters is becoming more and more popular, but the energy utilization rate of motor drive systems in my country is very low, especially in the field of high-voltage motors, which is basically 30% lower than the average level abroad. The frequency conversion speed regulation of the motor has gradually gained the attention of the country. The power module cascaded high-voltage inverter has been widely used in the field of high-voltage frequency conversion due to its high reliability and perfect output waveform. [0003] The existing frequency conversion speed regulation of the motor generally uses DSP to control the work of the inverter. The DSP not only completes the relevant calculations, but also needs to form pulses, ...

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Problems solved by technology

[0003] The existing frequency conversion speed regulation of the motor generally uses DSP to control the work of the inverter. The DSP not only completes the relevant calculations, but also needs to form pulses, which cannot guarantee the real-time performance of the control, and the control effect is not ideal. Therefore, it is necessary to design a A new kind of unit cascaded frequency converter based on DSP and FPGA

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