| 1. | Pwm pulse width modulated
调谐脉冲宽度 |
| 2. | 2 use pulse width modulate ( pwm ) technology controls intensity of ultrasonic sound output . regulation is convenient
2 、用脉宽调制技术控制超声输出强度，输出强度调节方便。 |
| 3. | This paper presents a new capacitive accelerator readout circuit used pulse width modulated ( pwm ) in single chip
本文的目的就是研究与设计单片微硅电容加速度传感器读出电路中频变脉冲宽度调制模块。 |
| 4. | The sine wave pulse width modulation ( spwm ) is used to reduce the wastage and the noise of the motor more effectively , as comparing to the equal pulse width modulated pwm
相对于等宽脉宽调制pwm ，正弦波脉宽调制spwm可以有效地降低电动机的损耗和噪声。 |
| 5. | In this paper , a phase shifting pulse width modulated ( pwm ) soft switching high voltage invert power supply has been developed with the use of the principle of advanced invert technique and the new type of power semi - conductor device - insulated gate bipolar transistor ( igbt )
本文采用最新的逆变思想与新型的开关器件?绝缘栅型双极晶体管( igbt ) ，研制出了移相式pwm软开关高压逆变电源。逆变技术发展至今，已经逐渐向大功率方向发展。 |
| 6. | Step power is the key for step magnetic potential , the pulse width modulate technology that selects the triangle wave as the carrier and ladder sine wave as the modulate wave is researched , furthermore the design of the actuator drive adopts dsp as the digital controller is introduced
步进电源是产生步进磁势的关键，文章研究了三角波为载波，阶梯正弦波为调制波的脉宽调制技术，进而介绍了采用dsp组成全数字控制器，完成步进电源触发的执行器驱动器的设计。 |
| 7. | There are five parts are as follows : in part one , the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration , then the low frequency oscillation of the system is simulated according to the model . next , from the view point of energy conversion of the inverter - induction system , a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not
首先引入开关函数概念，建立了正弦脉宽调制( spwm )逆变器供电异步电动机，考虑主磁路饱和时的变频调速系统整体数学模型，模拟系统的低频振荡；其次从逆变器-异步电动机系统能量转换角度出发，提出通过检测逆变器输入电流中负电流的间隔时间是否大于1 / f _ c ( f _ c为逆变器载波频率)来判定系统是否出现低频振荡；最后的实验结果验证了系统低频振荡建模和判据的实用性和正确性。 |
| 8. | The techniques with two different methods are classified as : the mode of pulse width modulated , and the difference of control signal . the advantages and disadvantages of each method is analyzed and compared , and where each method is more adapted to is pointed out . a type of switching power supply management ic based on current mode control method is designed which is a pwm boost converter
本文全面分析、描述了dc - dc开关电源变换器的控制方法,并依据脉宽调制的方法何采用控制信号的选取对控制方法进行了分类,详细阐述了各种控制方法的基本原理,分析比较了他们各自的优缺点,指出了每种控制方法所使用的场合。 |
