在电子电路设计中,PFM(Pulse Frequency Modulation,脉冲频率调制)是一种调制技术,其主要特点是在负载变化时调整脉冲的频率,而保持脉冲的宽度(时间长度)相对恒定。与PWM(Pulse Width Modulation,脉冲宽度调制)相比,PFM在某些应用中具有独特的优势和应用场景。
In electrical design, PFM (Pulse Frequency Modulation) is a technique used to regulate the output of power electronic devices by varying the frequency of the pulses while keeping the pulse width relatively constant.
PFM 是一种脉冲频率随输入信号幅度变化的调制方式。它常用于电源管理电路。
PFM is a type of modulation where the frequency of the pulses varies according to the amplitude of the input signal. It is commonly used in power management circuits.
PFM的工作原理
PFM通过改变开关脉冲的频率来调节输出。通常在轻载或待机模式下使用PFM,因为它在低功耗状态下比PWM更有效率。具体来说,当负载减少时,PFM会降低脉冲频率,以减少开关损耗和静态功耗;而在负载增加时,脉冲频率会增加,以满足更高的功率需求。
How PFM Works
* Frequency Variation: In PFM, the frequency of the switching pulses changes based on the load demand. When the load is light, the frequency of