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pwm
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  脉宽调制
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  “pwm”译为未确定词的双语例句
    Novel Resonant Transition Soft-Switching Three-Phase PWM Inverters
    新型谐振过渡软开关三相PWM逆变器
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  pwm
Furthermore, it is clear that when carrier signal h(t)=0, closed-loop pulse-width modulation (PWM) DC-DC converters are not well posed, and when some condition is satisfied, the closed-loop PWM DC-DC converters with a P controller are well posed.
      
Finally, it is verified that the proposed SVPWM is actually a pulse-width modulation (PWM) technology based on line voltages.
      
A novel PWM scheme to eliminate the diode freewheeling in the inactive phase in BLDC motor
      
However, a ripple current occurs in the inactive phase due to the diode freewheeling during the non-commutation period in the traditional pulse width modulation (PWM) methods, which aggravates the torque ripples.
      
A new PWM method is proposed in this paper to eliminate the diode freewheeling during the non-commutation period in the inactive phase.
      
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In this paper some important topics concerning pulse width modulated (PWM)DC motor speed control systems are discussed and the conclusions confirmed by test.An engineering method for designing such systems is proposed and it can be used also as a design reference for similar systems'.

本文讨论脉宽调制式(PWM式)直流调速系统运行中的几个重要问题,并在此基础上提出了系统设计的工程处理方法.所得结论均经过实验验证,可供设计同类系统时参考.

In the resonant transformerless switching-mode power supplies (TLSMPS), the method of switchoff in the duration of zero current is applied. Consequently, as compared with chopper (PWM) type TLSMPS, it is possible to avoid the second breakdown, reduce the switching dissipation and radio frequency interference in the resonant TLSMPS.The operation of the power circuit of resonant TLSMPS is analyzed mathematically and the features of control are discussed in this paper. For solving the problem of stabilization...

In the resonant transformerless switching-mode power supplies (TLSMPS), the method of switchoff in the duration of zero current is applied. Consequently, as compared with chopper (PWM) type TLSMPS, it is possible to avoid the second breakdown, reduce the switching dissipation and radio frequency interference in the resonant TLSMPS.The operation of the power circuit of resonant TLSMPS is analyzed mathematically and the features of control are discussed in this paper. For solving the problem of stabilization in the control system of resonant TLSMPS, the technique of "forward" ripple feedback is proposed. Also, the existence of minor carrier storage effect in switching transistor of resonant loop is illustrated, and the impact of this effect is reduced.

本文完整地分析了谐振式开关电源主回路工作的各个电性过程,阐明了它们的控制特点,指出采用纹波“提前”反馈技术可以解决控制的稳定性问题,揭示了开关管少数载流子存储效应在谐振回路中的表现形式及解决办法。实验线路获得了良好的技术指标。和同功率串联稳压电源相比,效率大为提高,体积重量大为减小。

To improve the quality of steelingot a technology which uses the two phase SCR inverter as a electromagnetic stirring power supply has been developed for continuous casting.The principle of voltage source circuit used for stirring and the DC-side commutation method to turn off the main thyristors of inverter are described.In addition to these, the control scheme using PWM and the experimental results under inductive load are also presented.Finally some comments concerned with how to build up a large power...

To improve the quality of steelingot a technology which uses the two phase SCR inverter as a electromagnetic stirring power supply has been developed for continuous casting.The principle of voltage source circuit used for stirring and the DC-side commutation method to turn off the main thyristors of inverter are described.In addition to these, the control scheme using PWM and the experimental results under inductive load are also presented.Finally some comments concerned with how to build up a large power two phase inverter are pointed in this paper.

作者研究了用电压源线路实现供连铸搅钢用的二相逆变器装置,并采用在直流侧提供换相电流使逆变桥晶闸管换相. 本文除介绍新方案原理及其控制逻辑(控制技术利用PWM的脉宽调制)要求外并提供电感性负载下的试验结果.最后指出应用本文的线路原理试制大容量二相逆变器时的有关注意问题.

 
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