| 摘要: |
| 对脉宽调制(PWM)的一种非对称规则采样原理进行研究，给出了宜于在线运算的简便算法，并在此基础上提 出了一种基于FPGA(现场可编程门阵列)的锁相同步型PWM调制器的数字化实现方法。该方法以FPGA及ROM 作为可编程定时器，高开关频率基本固定，调制比与相位、频率可以分别独立控制，特别适用于PWM可逆整流器。 由于整个系统是由一片FPGA来控制,节省了大量的模拟器件,简化了电路板的设计，提高了系统的灵活性、精确性 和可靠性，而且利用FPGA的在线系统编程功能，使系统的升级换代十分方便。实验结果表明,该方法具有响应速 度快、实时性强、可靠性高等特点。 |
| 关键词: 非对称规则采样；脉宽调制；现场可编程门阵列(FPGA) 占空比 |
| DOI： |
| 分类号: |
| 基金项目:山东省自然科学基金项目(Y2003P02)；山东省科技攻关计划项目(2006GG2304001) |
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| A FPGA-based modulating scheme of digital storage combined PWM |
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ZHANG Jia-sheng, LIU Hai-bo, CHEN Wen-ya
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(College of Information and Control Engineering in China University of Petroleum, Dongying 257061，Shandong Province, China)
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| Abstract: |
| By analyzing the asymmetric regular sampling principle of pulse width modulation(PWM) , a simple method appropriate for online algorithm was provided and a FPGA-based digital method of phase-locked synchronous PWM modulator was presented. Both FPGA and ROM are used as programmable timer in the method. The switch frequency is high and fundamentally stable. The modulation ratio, phase and frequency can be controlled independentally，which is specially applicable to PWM reversible rectifier. The whole system is controlled through a piece of FPGA, thus massive analog devices are saved and the circuit board design is simplified. With such a method, the flexibility, accuracy and reliability are improved. In addition, the online programming function of FPGA facilitates the upgrading of the system. The experimental results show that the method is characterized by high response speed, strong real-timeliness and good reliability. |
| Key words: asymmetric regular sampling pulse width modulation(PWM) field programmable gate array (FPGA) duty ratio |
