Python实现SPWM、PLL与PID算法详解

SPWM、PLL、PID算法的Python实现与仿真

SPWM（正弦脉宽调制）实现

SPWM通过比较正弦波与三角波生成PWM信号。以下代码使用Python实现SPWM：

import numpy as np
import matplotlib.pyplot as plt

def generate_spwm(freq=50, amplitude=1, carrier_freq=1000, duration=0.02):
    t = np.linspace(0, duration, 10000)
    sine_wave = amplitude * np.sin(2 * np.pi * freq * t)
    triangle_wave = 2 * amplitude * np.abs(2 * (t * carrier_freq) - np.floor(2 * (t * carrier_freq) + 0.5)) - amplitude
    spwm = np.where(sine_wave > triangle_wave, 1, 0)
    return t, sine_wave, triangle_wave, spwm

t, sine, triangle, spwm = generate_spwm()
plt.figure(figsize=(12, 6))
plt.plot(t, sine, label='Sine Wave')
plt.plot(t, triangle, label='Triangle Wave')
plt.plot(t, spwm, label='SPWM Output')
plt.legend()
plt.title('SPWM Generation')
plt.xlabel('Time (s)')
plt.ylabel('Amplitude')
plt.grid()
plt.show()

PLL（锁相环）实现

数字PLL可以通过相位检测和闭环控制实现：