A new pwm circuit is presented in this paper , which is kept the pulse width constant but the pulse cycle adjusted with the modulated signal , so that the duty cycle is changed with the modulated signal 脉冲宽度调制是利用脉冲的周期不变,改变脉冲的宽度从而使脉冲的占空比发生变化达到调制的目的。脉冲宽度调制在工业控制、开关电源等领域中有广泛的应用。
In the study of oled performance under ac - voltage driving , we also found the performance of oled is largely impacted by driving frequency and duty ratio , the frequency around 50hz and duty ratio around 50 % is most fit for oled 交流驱动的频率和占空比对oled器件各方面的性能都有很大的影响,当频率为50hz左右,占空比为50 %左右时, oled器件的性能为最佳。
Control arithmetic of position loop and velocity loop has been realize in the digital controller , whose output is pwm signal with adjustable occupy rate which is put in the driving circuit to realize motor ’ s position and velocity control 在数字控制器中实现位置回路和速度回路的控制算法,其输出为可调占空比的pwm信号经驱动电路实现电机的位置和速度控制。
The basic design index was : maximum output power 9w , no load consumption < 50 mw , switching frequency 132khz , maximum duty cycle 65 % , thermal shutdown temperature 135 . simulation is very important to analog ic design 该变换器电路的主要设计指标为:最大输出功率9w ,空载时芯片的功耗低于50mw ,开关频率为132khz ,最大占空比为65 % ,热保护温度135 。
The plots showing the effect of length , duty - cycle and sensor performance are given . some useful conclusions are deduced , which give us another new practical way to fabricate working - well optical voltage sensor 文章讨论了ppln不同长度、不同占空比对该电压传感性能的影响，并给出了图示，得到了一些很好的结论，为制作光学电压传感器提供了另一种可行的新途径。
In chapter 3 , by using theoretic analysis the focusing properties of an ideal annular beam is demonstrated . the intensity distribution near the focal point is given explicitly to show the influence of the ratio of inner to outer radius 第三章，从理想的环形光束出发，先在理论上分析了环形聚焦光束在焦点附近的光强分布情况和光束内外径之比(占空比)对聚焦性质的影响。
One is that the operation duty cycle can not be larger than 50 % because of the requirement for the transformer resetting . as a result , the voltage stress of the secondary diode is high , which limits the usage of dfc in high output voltage application 但由于变压器磁芯复位的需要，其工作占空比必须小于50 ，从而造成占空比利用率不高，变压器副边电压高，副边高频整流二极管的电压应力大。
The pwm control of duty cycles acts as an electric transformer which regulates the amplitudes of equivalent input voltage and equivalent output voltage , so that both positive and negative amplitudes of equivalent input voltage are equal to those of equivalent output voltage 对器件占空比的pwm调节，相当于在电路中加入一个电子变压器，使得输入方波电源和输出方波电源的正负电压幅值分别匹配。
The functions of system controller are mainly finished by dsp and cpld . the functions , such as the realization of closed - loop and calculation of the modulation duties online , are finished in dsp . the responsibility of cpld mainly is switch control signals transition 其中,系统的控制器功能主要由dsp和cpld完成, dsp实现系统闭环并实时计算调制占空比等功能, cpld负责开关控制信号的译码转换等工作。
A variable reactance can be realized by duty ratio control . then the fcl can attain to the goal of controllable limiting fault current and controllable series compensation . first , the topology of pwm - fcl is proposed based on the analysis of others " s research 它是由一个以pwm原理控制的电感模块和一个补偿电容并联后，再与一个限流电感串联而成，改变脉冲的占空比可以得到变化的阻抗，实现限流和串联补偿。
