Application of inequality proportion PWM impulse in top magnetic shaker

WANG Yong， ZHENG Bo-wen， WANG Wei
（College of Information Engineering， Zhejiang University of Technology， Hangzhou 310032， China）

Abstract： In order to solve the problems of the accuracy of pulse in top magnetic shaker，the inequality proportion PWM impulse was investigated. After the analysis of inequality proportion PWM impulse，the relationship between duty cycle and waveform was established.A method was presented to the fundament and implementation method of the non-uniform pulse width modulation impulse.The universal 8-bit microcontroller and FET switching device were evaluated on the basis of the block diagram of digital DC-DC switched circuit，the inequality proportion PWM impulse technique were tested.The experimental results show that the theory is correct.Lastly， to practical application， the different exterior composite factor is analyzed， and the ways to select the new technique with appropriately are supplied.
Key words： teady-state error； non-uniform pulse width modulation（PWM） impulse； accuracy