With the popularization of inverter technology, more and more home appliances, industrial equipment are considering the use of inverters to achieve energy-saving transformation, then understand the basics of inverters, will help us to better use inverters, the following are often asked, but also the network retrieval of more questions, the following, Everest Electric Editor for everyone to do a little popularization.

PWM: Pulse Width Modulation (pulse width modulation), according to a certain rule to change the pulse width of the pulse train, in order to adjust the output volume and waveform of a modulation.

A modulation method.

PAM: Pulse Amplitude Modulation (PAM) is a modulation method that changes the pulse amplitude of a pulse train according to a certain rule to adjust the output value and waveform.

PAM: Pulse Amplitude Modulation is a modulation method to adjust the output volume and waveform by changing the pulse amplitude of the pulse train according to a certain rule.

Next, what are the advantages and disadvantages of PWM and PAM

    Pulse Width Modulation (PWM) inverter is an AC to AC inverter. It is the frequency AC through the diode rectifier into DC, and then DC through the inverter into the frequency and voltage can be controlled by the AC power. Pulse width modulated inverter is very widely used, and its main advantages are as follows.

In the main circuit rectifier and inverter two converter unit, only the inverter unit is controllable, using fully controlled power switching devices (such as IGBT, GTO, IGCT, IEGT, etc.), through the drive voltage pulse for control, can adjust the inverter output voltage and frequency at the same time, simple structure, high efficiency.

Although the output voltage is pulse voltage, the proportion of sinusoidal fundamental wave is larger through PWM control technology, thus the motor torque pulsation is small, the steady-state performance is good, and the speed range is wide.

The inverter realizes both voltage and frequency regulation, and the dynamic response of the system is not affected by the parameters of the intermediate DC link filter, so the dynamic performance is good.

With uncontrollable diode rectifier, the power factor of the power side is higher than that of the controllable rectifier, and it is not affected by the output voltage level of the inverter.

    Pulse amplitude modulation (PAM) inverter advantages and disadvantages: This is a control method that controls the amplitude of the output voltage (current) in the rectifier circuit part and the output frequency in the inverter circuit part. Because the switching frequency of the inverter circuit converter in the PAM-controlled inverter is the output frequency of the inverter, it is a synchronous speed control method. Due to the low switching frequency of the inverter converter (hereinafter referred to as carrier frequency), the PAM-controlled inverter is characterized by low motor running noise and high efficiency when it is used for speed control. However, since this control method must control the rectifier circuit and the inverter circuit at the same time, the control circuit is more complicated. In addition, this control method also has the disadvantage of large fluctuations when the motor is running at low speed.

So, how to choose the right inverter for your motor? The quickest way is to find the Everest editor to help you recommend.