提出一种改进的基于采样-保持策略的电流三态调制开关功放。
An improved current-controlled tristate switching power amplifier based on sample-hold strategy is proposed in this paper.
该文首次将粒子群算法用于三电平正弦脉冲宽度调制开关时刻的优化。
Particle swarm optimization is firstly applied to optimize a three level voltage pulse width modulation inverter in this paper.
高频脉冲宽度调制电力控制系统，可以实现用半导体开关。
High frequency pulse width modulation power control systems can be realized using semiconductor switches.
传感模块由传感器电路、调制电路和模拟信号开关组成。
Sensor module is composed of sensor circuit, modulation circuit and analog signal switch.
定性地分析了各优化方法调制波的谐波特性，从本质上分析了它们降低开关损耗的基本思想。
The harmonic peculiarity of carrier waves of each optimized method and expresses elementary ideas in methods of decreasing switching dissipation above-mentioned essentially.
本文介绍一种以VMOSFET为高压开关的新型脉冲调制器，叙述其特点、工作原理及电路设计。
This paper introduces a new pulse modulator which USES VMOSFET as high voltage switch, describes its characteristics, operating principle and circuit design.
用继电器即可；但如果需要调速，可以使用三极管，场效应管等开关元件实现PWM（脉冲宽度调制）调速。
With the relay can be; but if you need to speed, you can use the transistor, FET and other switching elements to achieve PWM (pulse width modulation) speed.
该方法将实际输出电压和期望输出电压的比较偏差作为负反馈加到下一个采样周期的开关调制函数矩阵中。
The discrepancy between the actual output voltage and expected output voltage of the matrix converter is calculated and added to the switch modulation matrix in the next sampling period as feedback.
其次，采用系统参数开关调制策略，研究了两个超混沌电路的控制问题。
In the second place, controlling using strategy of system parameter switching modulation in two hyperchaotic circuits is studied.
提出了一种基于小开关损耗的随机空间矢量调制技术。
A novel random space vector modulation technique based on small switch losses was proposed.
在这里，离散的开或关的状态调制本身可以被用来控制开关，从而控制得或电流负载。
Here the discrete on or OFF state of the modulation itself can be used to control the switches thereby controlling the voltage or current across the load.
提出了一种基于最小开关损耗的随机脉宽调制技术。
A novel random pulse width modulation technique based on small switch losses is proposed.
研究了不同调制速率下的增益开关半导体激光器的最佳工作状态。
The optimal operating condition of gain switched semiconductor laser with different modulation rate is studied in this paper.
空间矢量脉宽调制和双向开关多步换流方式是矩阵式变换器的基本控制策略。
Space vector pulse width modulation(SVPWM) and multi-step commutation method of bi-directional switches are the basic control strategies of the matrix converter.
利用电压空间矢量脉宽调制(SVPWM)信号变换控制功率变换器各开关器件的导通占空比，实现异步电动机的速度调节。
Using space vector pulse-width modulation (SVPWM) signal transformation method, speed regulation of induction motor is implemented by controlling the duty ratio of every converter switch.
这种脉冲发生器适用于相干光瞬态研究，晶体调制和晶体开关等实验。
This pulser is adapted to coherent optical transient study, crystal modulator and crystal switch experiments etc.
本文介绍了以电流控制型脉宽调制芯片uc 3842构成的开关电源的原理，分析了其保护电路的缺陷，并提出了一种改进的思路。
The paper introduces the principle of switch power which is composed by current control type PMW UC3842 and analyzes the shortage of protective circuit and proposes an improving idea.
系统采用空间电压矢量脉宽调制技术得到逆变器的开关控制信号。
The control scheme gets the switch control signal of inverter with the space voltage vector modulation technology.
通过对其换流过程的分析，提出了采用谐振开关控制，箝位开关控制的电流滞环控制的调制方式的策略。
By analyzing the process of the inversion, the control strategy of resonant switch and clamped switch modulation with current hysteresis control is discussed.
以空间矢量调制方法来获得逆变器的开关信号，实现了小的转矩脉动和恒定的开关频率。
The control signals of invertor are produced by space vector modulation to achieve a small torque ripple and constant switch frequency.
当调制系数较低时，会造成开关器件利用率不均匀，导致部分器件提前损坏。
As a result, some switching devices would be worn out earlier because of the unbalanced utilization at low modulation indices.
将随机调制模式中的随机部分用混沌信号替代，得到了多种混沌开关调制模式。
Replaced the random signals with chaotic signals, all kinds chaotic switching modulation mode can be obtained.
介绍了电压驱动型脉宽调制器件TL494的脉宽调制特性，并对其在半桥变换开关电源中的应用情况做了分析。
The pulse width modulation character of voltage drive -type pulse width modulator TL494 is introduced. The applicable situation of TL494 in semi -bridge alternate switch power is also analyzed.
介绍了三相开关磁阻电动机脉宽调制（PWM）控制系统及开关磁阻电动机（SRM）的基本结构与工作原理。
This paper mainly discusses a PWM control system for switched resistant motor (SRM) driving system and the base structure and working principle of SRM are introduced.
调制工作类似于板手开关。
设计了大功率固态调制器的新型固态脉冲开关模块。
Solid state pulse switch modules are developed for high power modulator.
仿真结果表明：四种混沌源调制生成的混沌开关调制信号，均能够降低电源的输入电流及输出电压的频谱峰值。
Simulation results demonstrate: the chaotic modulation signals generated from the four kinds of chaotic sources can all reduce the peak level of the input current and the output voltage spectrums.
仿真结果表明：四种混沌源调制生成的混沌开关调制信号，均能够降低电源的输入电流及输出电压的频谱峰值。
Simulation results demonstrate: the chaotic modulation signals generated from the four kinds of chaotic sources can all reduce the peak level of the input current and the output voltage spectrums.
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