《机床与液压》 Hydromechatronics Engineering

文章详情

稿件标题: Reasearch on A/D Conversion with Strong Anti-jamming Ability using PWM
稿件作者: TANG Luxin,LI Jie, LIN Junbin
关键字词: A/D conversion, pulse-width modulation(PWM), strong anti-jamming;precision of transformation
文章摘要: System that has somewhat the characteristics of interference and feedback from low frequency signal is always controlled of three factors: flow, pressure and temperature,so that A/D conversion is difficult to achieve the requirements of anti-interference. This paper adopts a new pulse-width modulation (PWM) circuit to realize the conversion, by which the measured analog signal is amplified, rectified and filtered, and then is compared with the triangle wave modulation signal. So the PWM signal’s duty cycle is proportional to the level of measured signal which is obtained. Just by using the timer to measure the duty cycle, the microprocessor can calculate the input analog signal. Ratio of processor clock cycle and triangular wave cycle is the accuracy of A/D conversion. The frequency of PWM is lower, the accuracy is higher. This analog-to-digital conversion circuit is simple, has a strong anti-jamming capability, and is suitable for the analog-to-digital especially conversion of lo
收录刊物: 2012.24
稿件基金: National Natural Science Foundation of China(10475020)
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