pulse width modulation

简明释义

脉冲宽度调制

英英释义

例句

1.The use of pulse width modulation (脉宽调制) in power supplies helps to regulate output voltage levels.

在电源中使用脉宽调制 (脉宽调制)有助于调节输出电压水平。

2.Audio amplifiers often utilize pulse width modulation (脉宽调制) to efficiently drive speakers with minimal distortion.

音频放大器通常利用脉宽调制 (脉宽调制)有效驱动扬声器，减少失真。

3.Robotic arms often rely on pulse width modulation (脉宽调制) for precise movement control.

机器人手臂通常依靠脉宽调制 (脉宽调制)进行精确的运动控制。

4.The motor speed can be controlled using pulse width modulation (脉宽调制) to adjust the power delivered to the motor.

通过使用脉宽调制 (脉宽调制)，可以调整电机的功率，从而控制电机的速度。

5.In LED lighting, pulse width modulation (脉宽调制) is used to dim the lights without changing their color temperature.

在LED照明中，使用脉宽调制 (脉宽调制)来调暗灯光，而不会改变其色温。

作文

Pulse width modulation, commonly abbreviated as PWM, is a technique used to control the amount of power delivered to electrical devices by varying the width of the pulses in a pulse train. This method is widely utilized in various applications, especially in motor control, lighting, and heating systems. Understanding pulse width modulation (脉宽调制) is crucial for engineers and hobbyists alike, as it provides an efficient means of managing power without the need for bulky components or excessive heat generation.The basic principle behind PWM involves switching a signal between high and low states at a rapid pace. By adjusting the duration that the signal remains in the high state versus the low state, one can effectively control the average voltage and current supplied to the load. For instance, if the high state lasts longer than the low state within a given period, the average power delivered to the device increases. Conversely, if the low state is longer, the average power decreases.One of the key advantages of pulse width modulation (脉宽调制) is its efficiency. Traditional methods of power control, such as resistors or linear regulators, dissipate excess energy as heat, which can lead to overheating and energy loss. In contrast, PWM allows for precise control without significant energy waste. This efficiency makes PWM ideal for applications like controlling the brightness of LED lights or regulating the speed of electric motors.In motor control applications, pulse width modulation (脉宽调制) is particularly valuable. By varying the duty cycle of the PWM signal, one can control the speed of a DC motor. A higher duty cycle results in a faster motor speed, while a lower duty cycle slows it down. This method not only improves performance but also enhances the lifespan of the motor by reducing heat generation.Another area where PWM is extensively applied is in audio systems. In digital audio amplifiers, pulse width modulation (脉宽调制) is used to convert audio signals into a format suitable for amplification. By modulating the width of the pulses according to the audio signal, the amplifier can efficiently drive speakers with minimal distortion.Moreover, pulse width modulation (脉宽调制) is also found in power supply circuits. Switching power supplies use PWM to regulate output voltage and current, allowing for compact designs and high efficiency. This technology has become increasingly important in modern electronics, where size and power consumption are critical factors.Despite its numerous benefits, there are challenges associated with pulse width modulation (脉宽调制). One of the main issues is electromagnetic interference (EMI), which can be generated by the rapid switching of the PWM signal. Proper circuit design and filtering techniques are necessary to mitigate these effects and ensure stable operation.In conclusion, pulse width modulation (脉宽调制) is a versatile and efficient technique that plays a vital role in modern electronic systems. Its ability to control power delivery with minimal energy loss makes it indispensable in various applications, from motor control to audio amplification. As technology continues to advance, understanding and implementing PWM will remain essential for engineers and enthusiasts aiming to create innovative and efficient electronic solutions.

脉宽调制（pulse width modulation）是一种通过改变脉冲宽度来控制电力传递给电气设备的技术。这种方法广泛应用于各种领域，特别是在电机控制、照明和加热系统中。理解脉宽调制对于工程师和爱好者来说至关重要，因为它提供了一种高效的管理电源的方法，而不需要笨重的组件或过多的热量产生。PWM的基本原理是快速切换信号在高状态和低状态之间。通过调整信号在高状态和低状态下保持的时间，可以有效控制施加到负载上的平均电压和电流。例如，如果高状态在给定周期内持续时间长于低状态，则提供给设备的平均功率增加。相反，如果低状态更长，则平均功率减少。脉宽调制的一个关键优点是其效率。传统的功率控制方法，如电阻器或线性稳压器，会将多余的能量以热量的形式散失，这可能导致过热和能量损失。相比之下，PWM允许精确控制而不会显著浪费能量。这种效率使得PWM非常适合用于控制LED灯的亮度或调节电动机的速度等应用。在电机控制应用中，脉宽调制尤其有价值。通过改变PWM信号的占空比，可以控制直流电动机的速度。较高的占空比导致电动机速度更快，而较低的占空比则使其减速。这种方法不仅提高了性能，还通过减少热量产生来延长电动机的使用寿命。另一种广泛应用PWM的领域是音频系统。在数字音频放大器中，脉宽调制用于将音频信号转换为适合放大的格式。通过根据音频信号调制脉冲的宽度，放大器可以高效驱动扬声器，且失真最小。此外，脉宽调制还出现在电源电路中。开关电源使用PWM来调节输出电压和电流，从而实现紧凑设计和高效率。这项技术在现代电子产品中变得越来越重要，因为尺寸和功耗是关键因素。尽管有许多优点，脉宽调制也面临一些挑战。其中一个主要问题是电磁干扰（EMI），这可能由PWM信号的快速切换产生。需要适当的电路设计和滤波技术来减轻这些影响，确保稳定运行。总之，脉宽调制是一种多功能且高效的技术，在现代电子系统中发挥着至关重要的作用。其以最小的能量损失控制电力传递的能力，使其在从电机控制到音频放大等各种应用中不可或缺。随着技术的不断进步，理解和实施PWM将继续对工程师和爱好者创造创新和高效的电子解决方案至关重要。