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以TMS320F2812作为控制电路芯片,采用二相六桥臂式电路作为逆变主电路,利用DSP生成三对六路SPWM控制信号对逆变主电路中的功率器件通断进行控制,在输出端得到了两相正交的正弦交流电。在此基础上,使用PI控制技术对输出电压幅值进行调节,实现了对电流频率和有效值的解耦控制。为了验证该逆变电源控制系统的动态响应性能,在Simulink支持下,构建了逆变电源控制系统的仿真电路,对电源控制系统在1 Hz、500 A和3 Hz、800 A工况下的动态响应性能进行仿真。结果表明,所设计的电磁搅拌器逆变电源控制系统可以输出频率与有效值在对应范围内可解耦控制的两相正交正弦电流,能够满足铸造生产中电磁搅拌器的实际使用需要。
TMS320F2812 as a control circuit chip, the use of two-phase six-leg inverter circuit as the main circuit, the use of DSP to generate three pairs of six SPWM control signal on the inverter main circuit power device on-off control, the output has been two Phase orthogonal sinusoidal alternating current. On this basis, the output voltage amplitude is adjusted by using PI control technology to realize the decoupling control of the current frequency and effective value. In order to verify the dynamic response performance of the inverter power control system, the simulation circuit of the inverter power control system is constructed with the support of Simulink. The dynamic response of the power control system at 1 Hz, 500 A and 3 Hz, 800 A Response performance simulation. The results show that the designed inverter control system of electromagnetic stirrer can output the two-phase orthogonal sinusoidal current whose frequency and effective value can be decoupled and controlled in the corresponding range, which can meet the practical needs of electromagnetic stirrer in casting production.