Abstract : This paper introduces a variable frequency power supply based on the space vector PwM algorithm. The system uses the 68HC908MR16 motor control chip from Motorola. It converts DC power into a frequency-adjustable three-phase sinusoidal AC power through P1 regulation. At the same time, serial communication is used to realize the system status display and parameter modification. Keywords : Space vector; Pulse width modulation; Inverter; Dedicated chip MR16 0 Introduction With the continuous development of drive technology and the continuous updating of high-power power electronic devices, the application of AC asynchronous motor/factory control PWM inverter power supply in industry is becoming increasingly widespread. The traditional SPWM inverter speed regulation technology is theoretically mature, simple in principle, and easy to implement, but its inverter output line voltage amplitude is only 0.866, and the DC side voltage utilization rate is low. However, the space vector PWM (SVPWM) algorithm can increase the inverter output line voltage amplitude by 15% compared with the SPWM modulation method. Moreover, under the same carrier frequency, the inverter using the SVPWM control method has fewer switching times, reducing switching losses. Therefore, this paper uses the SVPWM algorithm, considers the inverter and motor as a whole, and integrates the three-phase voltage. Through real-time calculation, the constant flux inverter speed regulation control of the motor is realized using the MR16 microcontroller. 1 Basic Working Principle of Space Vector PWM Figure 1 shows the working principle diagram of a three-phase voltage-type inverter, which consists of 6 switching devices. The space voltage vector output by the inverter is:
[b][align=center]For details, please click: Space Vector Control Frequency Converter Based on 68HC908MR16 Microcontroller[/align][/b]
