many high-voltage ceramic capacitor products of the same voltage and capacity have two different shape characteristics: lead type and screw type. then, how to determine which kind of high-voltage capacitor should be used in the application process? we use 5000pf30kv ceramic capacitor for the example to give you analysis.
for example, a customer wants to design a voltage doubler circuit. it is mainly composed of three components: one is a high voltage capacitor, one is a rectifier, and the other is a transformer. the design principle is to adjust the input voltage through the transformer's transformer. to the required output voltage, the output terminal is connected to the capacitor. the capacitor part is connected in series by a plurality of high voltage ceramic capacitors and rectified by a rectifier tube. the combination of the capacitor and the rectifier tube reaches the total voltage of the circuit to a certain height. actual requirements.
assuming a 200kv high-voltage source, using a 30kv5000pf capacitor requires about 10 series. from the installation point of view, it is more convenient to use a screw-type capacitor. if a lead-type capacitor is used, a special pcb is required to fix it. which one to use, not easy to use, but to see the actual parameters.
generally, the current of the high-voltage generator is not large. the high-voltage generator of many test instruments has a current of about 10ma. some x-ray equipment, ct machine, and current are only about 1600ma. so overall, the current is relatively small.
most of the products of the high voltage generator are used in the medium frequency environment, that is, the frequency is 10khz-60khz. some may require 100khz or 200kc, which has certain requirements on the material of the capacitor. in the high pressure ceramic medium, it is economical. and practical is the y5t dielectric ceramic, the capacitor of this material can work in the pulse circuit within 200khz.
according to the above, we can recommend the use of y5t material 30kv5000pf capacitors. due to the small current, the lead type can meet the requirements. if the product has high current requirements, the current exceeds 2a, it is recommended to use a screw type high voltage capacitor. the significance of the correct choice is: not only to meet the needs of the design space, but also to reduce the cost appropriately. of course, screw-type high-voltage capacitors are much more expensive than lead-type products.
there are not many requirements for common high-voltage generators. the above suggestions can meet the requirements. of course, if the situation is special, it is recommended according to the actual situation.