【摘要】 通过研究数字"抖动"的基本原理,以ALTERA公司CycloneⅡ系列FPGA为载体,在基于计数方式的数字PWM上使用数字"抖动"来提高DPWM的精度,精度达到500ps。介绍了基于FPGA的数字"抖动"的实现过程,分析了数字"抖动"对输出纹波的影响以及对控制带宽的限制。并在以12V输入、1V输出Sync-Buck为主电路的样机上得以验证。更多还原

【Abstract】 By analyzing the basic principle of digital dither,this context accomplishes digital dither to improve the resolution of digital PWM based on counter on the CycloneⅡ FPGA from ALTERA.The time resolution is up to 500ps.The implementation of digital dither is described.The digital dither affecting the output voltage ripple and control bandwidth is also analyzed.The experimental result of digital dither is verified on the prototype Sync-Buck 12V input 1V output VR.更多还原