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Which frequency does the inverter's high frequency and low frequency refer to?

Column:Industry News Time:2021-06-28
First of all, let's first understand what is the frequency of the inverter and what does it represent?

Which frequency does the inverter's high frequency and low frequency refer to?

First of all, let's first understand what is the frequency of the inverter and what does it represent?

The frequency of the inverter is an important parameter of alternating current, which is the number of positive and negative changes in current per second. Also known as Zhou Bo. The number of positive and negative half-week changes in the exchange per second

The national power standard is 50 Hz. Under normal circumstances, the period is 20MS, F 1/T 50HZ.


The frequency of the electricity we use daily is 50Hz, if we want to change its frequency, we have to change it through a frequency converter. The working principle of the frequency converter is to first change the alternating current with frequency into direct current without frequency, and then control the electronic circuit so that it can adjust its frequency arbitrarily. The inverter is similar to the second half of the frequency converter, which converts direct current into alternating current.

inverter

So what is the general frequency of the inverter's high frequency?

Generally, at a frequency of 30-50HZ, which is too high, the power switch tube may work abnormally, including severe heat generation and too small magnification. Therefore, when the frequency of the inverter is greater than 50HZ, it can become a high-frequency inverter.


The working frequency of the high-frequency transformer inside the inverter is generally around 30K. To be stable, it is best not to exceed 40kHZ. The switching tube heats up too much at high frequency and it is difficult to find the tube. Switching loss. It is obvious above 100k Hz, and some hundreds of K to several megabytes are all resonant.


But for switching power supply inverters, there is no fixed range for this frequency. It is mainly determined by the PWM chip. Some chips can adjust the frequency. There are tens of k, hundreds of k, and a few M, depending on your own design requirements. It has a large relationship with the parameters of the switch tube and the transformer. The use frequency is determined by the used device and the external circuit, which is not a definite value. To look at your actual power supply, different power supply frequencies are different.


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