【EVAL-M3-TS6-665PN】2. PFC working principle

ddllxxrr

【EVAL-M3-TS6-665PN】2. PFC working principle [Copy link]

 

Just like programming, some English abbreviations come into view. I hate these abbreviations. Some people even enjoy them. I was reading an article and suddenly encountered an abbreviation. Sometimes I couldn't guess it and it was very annoying.

The following comes from the Internet:

The full name of PFC is "Power Factor Correction " , which means "power factor correction". Power factor refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power to total power consumption (apparent power). Basically, power factor can measure the degree to which electricity is effectively used. The larger the power factor value, the higher the power utilization rate. Power factor is a parameter used to measure the power efficiency of electrical equipment. A low power factor means low power efficiency. The technology to improve the power factor of electrical equipment is called power factor correction.

So what is the difference between it and a switching power supply? ? ? ?

In the PFC switching power supply, the switching regulated power supply is a very important component. The function of the switching regulated power supply in the PFC is not much different from that of the ordinary switching regulated power supply, but there is a difference in power supply. The ordinary switching regulated power supply requires 220V rectifier power supply, while the PFC regulated switching power supply is powered by B+PFC.

This means that PFC can completely replace the switching power supply.

Infineon's solution can save a power supply.

Below is the schematic diagram. I have marked the components that are not complete.

The principle is to control the IGBT to adjust the power factor through the control board, and then generate the next level of voltage, and the next level of voltage generates the corresponding voltage through the power block to generate the voltage required by the IGBT of the motor. There is IRS2890DS protection in between.

And all this is controlled on the control panel. Alas, I just don’t have a control panel!!!

It can be seen that PFC can completely replace the switching power supply, which means that the cost of a switching power supply can be saved, but I think this is only based on experiments.

The 15V and 3.3V power supply principles are as follows:

This content is originally created by EEWORLD forum user ddllxxrr . If you want to reprint or use it for commercial purposes, you must obtain the author’s consent and indicate the source.

qwqwqw2088

The PFC circuit is understood to be mainly for improving the power factor.

Abbreviations are generally only used within the industry, and abbreviations outside the industry are just annoying.

qwqwqw2088

I am familiar with Infineon's solution of using IGBT to adjust the power factor.

伟林电源

If you don’t have a control board, you can contact Infineon to reapply. Although the cycle is long, there is still a chance to get it.

伟林电源

PFC is mainly used to adjust the power factor. Of course, the output is a stable DC, which is helpful for the subsequent conversion design.

不亦心

So how does PFC work?

Is this considered an evaluation?

ddllxxrr

Bu Yixin posted on 2019-8-13 00:15 So how does PFC work? Is this also considered an evaluation?

The working principle of PFC is a switching power supply, but the voltages of the two are different. This is not called a principle. As for the evaluation, the screen alone cannot work.

generalcircuits

The working principle of PFC is equivalent to that of switching power supply, but the voltages used by the two are different.

Learned

不亦心

ddllxxrr posted on 2019-8-13 08:10 The working principle of PFC is just a switching power supply, but the voltages of the two are different. This is not called a principle. As for the evaluation, the screen alone is not enough...

This explanation scared me so much, I give you full marks

90houyidai

What is the function of the diode in PFC?

ddllxxrr

90houyidai posted on 2019-9-21 13:32 What is the function of the diode in PFC?

Do not allow current to flow back