基于C8051F020的双路频率可设定PWM信号实现

Realization of Dual-Channel Set PWM Signal Frequency Based on C8051F020

针对全桥电源变换控制电路,编程设定自适应PWM信号难度大、灵活性差,提出一种基于C8051F020的双路频率可设定PWM信号实现方法。利用C8051F020单片机的多通道12位ADC转换器对各通道输入信号进行转换和比较,把ADC0各个通道转换的结果一次性成批次地送给可编程计数器阵列PCA0,利用PCA0的PWM辅助功能完成信号处理。实验验证了所设计的双路频率可设定受控PWM信号参数可设定。实验结果表明,该设计能够满足特定频率范围内PWM的自适应调节。

Full bridge power conversion control circuit programmed adaptive PWM signal is difficult, inflexible, based on C8051F020 dual frequency, proposed a method that set PWM signal can be realized. Use C8051F020 SCM multi-channel 12-bit ADC converter for each channel input signal conversion and comparison, the results for each channel ADC0 converse into a batch to give a one-time programmable counter array PCA0. Circuit uses PWM auxiliary function for PCA0 complete signal processing. Experiments designed a dual frequency PWM signal can be controlled by setting the parameter can be set. Experimental results show that the design can meet adaptive PWM within a specific frequency range.