PWM waveform generation method and device based on FPGA

Abstract

The invention discloses a PWM waveform generation method and device based on an FPGA. The method comprises the following steps: S1, enabling a programmable logic device to generate a synchronous clock signal with the same control period as a servo control system; and S2, if the type of the fundamental wave needing to be output is a sawtooth wave, configuring a comparator of the programmable logic device to be in a continuous increasing counting mode; enabling the programmable logic device to set an output signal to be 1 at the starting moment of the synchronous clock signal, and resetting the output signal when a count value exceeds a comparison value corresponding to a duty ratio; if the type of the fundamental wave needing to be output is a triangular wave, configuring the comparator of the programmable logic device to be in a continuous increase / decrease counting mode; and resetting the output signal by the programmable logic device at the starting moment of the synchronous clock signal, and setting the output signal to be 1 when the count value exceeds the comparison value corresponding to the duty ratio. Compared with the prior art, data processing chips such as a DSP6713 chip and the like can directly output PWM waveforms.

Description

Technical field [0001] The present invention relates to the field of processor control, and more particularly to an FPGA-based PWM waveform generating method and apparatus. Background technique [0002] Traditional servo control systems use DSP28XX or STM32 series chips as master chips, DSP28XX or STM32 series chips have a rich peripheral resource, especially the EPWM peripheral interface of complementary PWM signals, dedicated to motor control applications. The DSP28XX or STM32 series chip is small, and the floating-point data processing power is far less than a data processing chip such as DSP6713, so it can only select DSP6713 data processing chip in some applications that require complex data or algorithm processing. However, the DSP6713's data processing chip has little resources, and there is no motor control EPWM peripheral interface, so the PWM waveform cannot be output. Inventive content [0003] To solve the background technology, the external DSP6713 has very small ex...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the peripheral resources of the existing DSP6713 and other data processing chips in the background technology are very few, and there is no motor control ePWM peripheral interface, so the problem that the PWM waveform cannot be directly output, the present invention provides a PWM waveform generation method based on FPGA

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