Signal generator based on SPMW (sinusoidal pulse width modulation)

Abstract

The invention relates to a signal generator based on SPMW. The signal generator comprises a singlechip, an FPGA (field programmable gate array), two direct digital frequency synthesizers, two SPMW generator circuits, two dead zone control circuits and three isolators, wherein the two SPMW generator circuits are connected with one direct digital frequency synthesizer respectively; the singkechip is connected with the FPGA; both the two direct digital frequency synthesizers are controlled by the singlechip; two outputs of the singlechip are connected with a driver respectively and then connected with a second isolator; the two SPWM generator circuits are both connected to the outputs of the singlechip; the two SPWM generator circuits are connected to the singlechip through the direct digital frequency synthesizers; the two dead zone control circuits are respectively connected behind the two SPWM generators; a first isolator and a third isolator are respectively connected behind the two dead zone control circuits; and driver output voltage fundamental waves are mounted on the two direct digital frequency synthesizers respectively.

Description

technical field [0001] The present invention relates to a kind of signal generator, especially relate to a kind of on the basis of combining the advanced technology of chip such as DDS, FPGA, MCU, adopt the hardware modulation method to use the desired waveform as the modulating signal, take the modulated signal as the carrier, through Modulation of the carrier yields the desired SPWM waveform based on the SPMW signal generator. Background technique [0002] PWM (Pulse Width Modulation) pulse width modulation is a very effective technology that uses the digital output of a microprocessor to control analog circuits, and is widely used in many fields from measurement, communication to power control and conversion. [0003] SPWM (Sinusoidal Pulse Width Modulation) sinusoidal pulse width modulation is to change the modulation pulse mode on the basis of PWM. The pulse width time duty cycle of SPWM is arranged according to the sine rule, so that the output waveform can be output ...

AI Technical Summary

Problems solved by technology

[0019] The traditional SPWM driver chip is slow and not flexible enough, and has disadvantages such as complex circuit design, large volume, poor anti-interference ability, and long design cycle. It is difficult to meet the actual requirements for many occasions with special requirements.

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