【摘要】 通过对脉宽调制（PWM）原理及其与比例电磁铁输入电流关系的分析，充分结合VMOS开关管的特点，提出一种比例放大器的设计方案，并用实验证明了它的优越性。更多还原

【Abstract】 Through analyzing (Pulse-width modulation) PWM principle and the relation between PWM and proportional electromagnet input current, a design plan of proportional amplifier is put forward with combination of the feature of VMOS switching tube, and its advantage is verified by experiment更多还原