Views: 18 Author: Site Editor Publish Time: 2022-01-26 Origin: Site
Do you know what a capacitor is? I believe that many people know and have seen that capacitors have brought us great convenience and can store electrical energy, such as charging treasures. There are also many kinds of capacitors. Let's talk about what pulse capacitors are, and hope to help you.
Introduction to Capacitors
Two conductors that are close to each other with a non-conductive insulating medium sandwiched between them constitute a capacitor. A capacitor stores charge when a voltage is applied between its two plates. The capacitance of a capacitor is numerically equal to the ratio of the amount of charge on one conducting plate to the voltage between the two plates. The basic unit of capacitance of a capacitor is the farad (F). Capacitive elements are usually represented by the letter C in circuit diagrams.
Capacitors play an important role in tuning, bypassing, coupling, filtering and other circuits. It is used in the tuning circuit of transistor radios, as well as in the coupling circuits and bypass circuits of color TVs.
With the rapid development of electronic information technology, the replacement speed of digital electronic products is getting faster and faster, and the production and sales of consumer electronic products such as flat-panel TVs (LCD and PDP), notebook computers, digital cameras and other products have continued to grow, driving the Capacitor industry growth.
How are high voltage pulse capacitors different from ordinary capacitors?
There are two kinds of materials for high-voltage pulse capacitors: one is film type and the other is ceramic type.
Compared with thin films, ceramics have higher voltage characteristics. The advantage of film capacitors is that their capacitance is higher than that of ceramic capacitors.
Commonly used pulse ceramic capacitors are PC ceramics. This ceramic capacitor with a dielectric constant of 400 can operate from -55 degrees to +125 degrees. The temperature change rate is less than 5%. It has super voltage characteristics and pulse characteristics. The current optoelectronic military equipment and electromagnetic pulse military equipment mostly use PC material. Its pulse life is as high as more than 1 million times.
Of course, there are also experimental grade pulse capacitors. Many scientific research institutes choose N4700 ceramic materials as pulse capacitors. This material can also meet the needs of users to a certain extent, but if a large number of equipment is used, the lifespan will be insufficient. This product in the capacitor industry is about 3,000 to 50,000 pulse life.
The dielectric constant of N4700 medium is between 1800 and 2000. The temperature range is between -25 degrees and +85 degrees, and the temperature change rate is about 20%.
Therefore, in the field of ceramic capacitors, PC pulse medium is the real pulse capacitor.
Three advantages of PC pulse capacitors
1. Pulse voltage: PC pulse capacitors have extremely high voltage bearing capacity, especially pulse high voltage bearing capacity, which is unmatched by other capacitors. Generally, a 50KV pulse capacitor can withstand a maximum pulse voltage of 80KV. This is also rare in the field of high voltage ceramic capacitors;
2. High and low temperature characteristics: PC capacitors can be used in relatively cold environments, such as minus 50 degrees, or in high temperature environments, such as high temperatures of 125 degrees;
3. Pulse life: PC capacitors have high reliability and can work for a long time within the rated voltage. Its pulse life is more than 1 million times.
Pulse capacitor function
Due to the high reliability of PC pulse capacitors, this pulse capacitor can be used in most high-tech military equipment. For example, laser (photoelectric) weapons, electromagnetic guns, electromagnetic wave weapons, electronic interference, radar equipment, communication launch, etc. It also has good applications in some high-end civilian markets, such as laser cutting and other mechanical fields.
The above is the knowledge about pulse capacitors. I believe that my friends will understand it very well after reading it. It has its advantages and functions. My friends will definitely use it in the future. Finally, I wish you to buy a good pulse capacitor.
