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TechnicalPosition:Home Page -> Technical

How to test the life of high voltage ceramic capac

Published:2018-06-15 16:24:35Click to rate:

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High voltage generators use many high voltage ceramic capacitors. Prior to this, guests generally used high-voltage film capacitors. As the advantages of ceramic capacitors continue to manifest, in the future, film capacitors will appear less and less in high-voltage generators.
Before the old He has published a paper analyzing the advantages and disadvantages of high-voltage film capacitors and high-voltage ceramic capacitors, mainly the following:
1. The voltage is higher. The capacitance of the film capacitor is relatively low, and the operating voltage is not as high as that of the ceramic capacitor;
2. Small capacity. The capacity of ceramic capacitors is relatively small, but the latest products of Meishi capacitors have been introduced, and high-capacity high-voltage ceramic capacitors such as 30KV20000PF, 40KV15000PF, and 50KV 10000PF have been successfully developed.
3. Longer life. The life of a film capacitor is three or two years, and a good product will not exceed five years. High-voltage ceramic capacitors are different. For example, Meishi capacitors are openly promised: for 20 years, at least 10 years.
4. The internal resistance is smaller. This is determined by the respective structural characteristics. The internal resistance of the high-voltage ceramic capacitor is small, and the film capacitor is wound by the winding method, which causes the internal resistance to be large. Another negative effect of this large internal resistance is that the internal resistance of the capacitor will continue to increase during repeated charge and discharge, and the capacitor will be disabled in the circuit at a certain time.
The cowhide can't be blown, and the facts are more convincing. How long is the service life of the inverted high voltage ceramic capacitor? Let's take a look at the test session:
Take the high-voltage capacitor 35KV6000PF as an example. Philips uses this product from our company for use on X-ray machines. Medical, military, are used. For example, lidars, tanks, and submarines are all used. In order to ensure the life of the product for more than 10 years, Philips' test condition is that it works under the rated voltage of 150KV, does not stop for three consecutive months, and then repeatedly charges and discharges between the pulse voltages of 120KV~240KV. The last recorded data is More than 8000 times.
Do not underestimate the life of the 8000 charge and discharge, which is recorded under the premise that it is tested for three months after continuous operation. So, how long is the life of high-voltage ceramic capacitors from Meishi capacitors? How many times does charging and discharging? Please ask the engineers in the industry to tell me?

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