When it comes to modulating methods for variable-frequency power supply output waveforms, PWM, PAM, and SPWM are commonly used. Below, the 400Hz Power Supply editor will briefly introduce them to you:
PWM Modulation Method
The modulation is for the Pulse Width Modulation (PWM) of waveforms. It utilizes the switching characteristics of inverters to chop and modulate the DC power source, achieving a constant U/t control as needed. Compared to Pulse Amplitude Modulation (PAM), PWM modulation has higher power efficiency, but both produce an average voltage output in the form of a square wave.
II. PAM Modulation Method
PAM modulation involves modulating the pulse amplitude of the output waveform. While its applications are fewer compared to PWM, PAM modulation offers noiseless driving with less noise, but it has a low power factor and complex circuitry.
Three: SPWM Modulation Technique
Due to the fact that the output waveforms of PWM and PAM modulation are both square waves, in order to achieve better waveforms, a sine wave output is achieved. Therefore, the Sine Wave Pulse Width Modulation (SPWM) method was developed. It utilizes high-frequency pulse width modulation, which makes it easy to filter out higher-order harmonics. SPWM modulation is a rational modulation method and is commonly used in variable frequency power supply modulation.
Regarding the three modulation methods of variable frequency power supply output waveforms, we share these with you. For more information, please contact Aoying Electric, a professional manufacturer of 400HZ variable frequency power supplies.
