| 摘要 |
Disclosed is a pulse width modulation method and apparatus capable of expressing as many values as possible in a pulse width modulation (PWM) period, while maintaining the center of pulse energy substantially equal to the center of the PWM period. For this end, prepared is the PWM pattern generator 20 including 2 kinds of PWM pulse generator 21 and 22 for generating pulses having the pulse width of 0~N times of the reference clock period in 1 PWM period corresponding to a predetermined number N of the reference clock period. The PWM pulse generators 21 and 22 are properly switched by the switching circuit 30 under control of the control circuit 40 for performing time averaging process so that the centers of energy of the output pulses is substantially equal to the center of the PWM period.
|
