Random Slope PWM for Harmonic Dispersion

The patent applies dynamics by transitioning from fixed frequency to random variable frequency pulse width modulation. The switching frequency is made dynamic through randomization, where the carrier wave frequency varies randomly within a specified range rather than remaining constant. This dynamic approach disperses the harmonic energy that would otherwise concentrate at specific peak frequencies, thereby reducing noise and mechanical vibration while maintaining control simplicity through the use of standardized random modulation techniques.

The patent converts the harmful concentrated harmonic peaks into beneficial dispersed spectral distribution. By using random variable frequency modulation, the harmonic energy that would normally appear as intense peaks at specific frequencies is transformed into a more uniformly distributed spectral pattern. This conversion eliminates the need for additional filtering equipment while achieving the same or better electromagnetic interference suppression and vibration reduction effects.

The patent applies preliminary action by addressing the harmonic problem at its source through frequency randomization rather than attempting to filter it afterward. By pre-modulating the carrier wave frequency randomly before the harmonic generation occurs, the harmful harmonic peaks are prevented from forming in the first place. This proactive approach achieves both harmonic suppression and maintains fast dynamic response capability, as no additional filtering stage is required that would introduce delay.

The patent applies self-service by enabling the pulse width modulation system to suppress its own harmful harmonics and noise through internal frequency randomization. The random variable frequency modulation is implemented within the existing control architecture, allowing the system to self-regulate its spectral distribution without requiring external filtering equipment or vibration damping components. This eliminates the need for additional weight-bearing structures while achieving effective noise reduction.