Abstract: This paper introduces a design method for generating high-frequency modulated square waves using the Intel 80c196MC chip, based on the electromagnetic characteristics of an asynchronous motor and the principle of flux linkage tracking. Qualitative and quantitative analyses are presented. A specific algorithm and the voltage output waveform after implementation are given. Experimental results demonstrate the effectiveness of the proposed method. Keywords : frequency converter; asynchronous motor; square wave; voltage space vector pulse width modulation 0 Introduction The 80c196MC is a 16-bit microcontroller designed by Intel specifically for motor control. It contains a 3-phase PWM waveform generator (WFG) that can generate SPWM waves with minimal CPU intervention. In practical applications, due to the influence of switching devices, the carrier frequency cannot be too high. At high frequencies, because the number of wavefronts per phase is relatively much smaller, the lack of appropriate synchronization measures will lead to asymmetry in the 3-phase waveforms, which will seriously affect the output waveform and motor operation. When generating SPWM waves, the WFG operates in mode 0. When using a 16MHz crystal oscillator, the resolution of the WFG's reload register WG_RELOAD is 0.25 seconds. Around 600Hz, a change of 1 in the value of WG_RELOAD corresponds to a frequency change of approximately 0.7Hz. This resolution is insufficient in some situations. At high frequencies, a square wave with the same period and effective voltage value is typically used to approximate a sine wave. Square waves contain a large number of harmonic components. At high frequencies, because the fundamental voltage frequency increases, the frequencies of the 5th, 7th, 11th, and 13th harmonics also increase. The resulting harmonic effects no longer pose a significant threat to motor operation, making this feasible. [b][align=center]For more details, please click: A Design Method for High-Frequency Operation of VVVF Inverters[/align][/b]