Many electrical appliances will generate heat after working for a long time, such as televisions, electric fans, refrigerators, etc. These electrical appliances work continuously for several hours, and the outer shell of the body starts to heat up. Capacitors are no exception.
A capacitor is an energy storage element that can accommodate charges, store electrical energy, and provide electrical energy to electrical appliances. It is composed of two parallel insulated conductors and an insulating dielectric between the conductors. When the capacitor is working, the charge in the capacitor is constantly moving, generating current. For people, the ideal capacitor consumes no energy and has no losses. But in fact, when the capacitor is working, it will consume energy and lose energy due to the heat generated when the current is working.
Due to its safety characteristics, safety capacitors dissipate quickly after the power is turned off, and people will not get an electric shock when they touch it. Therefore, it is used in switching power supplies and electronic circuits to ensure the safety of users and maintenance personnel.
When the safety capacitor is powered on, a current is generated, and heat is generated when the current flows, so it is normal for the safety capacitor to generate heat, as long as the heating temperature is within the normal range of the safety capacitor, the working temperature of the safety capacitor is generally between -40°C and 110°C.
Excessive temperature and overheating are very harmful to safety capacitors. If the temperature is too high, the performance and stability of the capacitor will decrease, and it will also affect the working time and breakdown of the capacitor. The serious reasons for the heating of the safety capacitor are:
1. The voltage is too high and exceeds the voltage range of the safety capacitor, resulting in excessive current and greater heat generated, and the safety capacitor is easy to burst due to overheating.
2. There are harmonics in the circuit. It will cause the working voltage of the safety capacitor to increase, the current will increase, and the temperature will become high and overheat.
3. The external temperature is too high, the internal space is small, and the heat cannot be dissipated in time, causing the safety capacitor to overheat and burst.
4. The quality of the safety capacitor is poor, the working performance is unstable, and it is easy to overheat and cause the electrical appliances to fail to work normally.
When using safety capacitors, in addition to choosing branded safety capacitors, you must also pay attention to the use environment and temperature, so as to ensure the normal use of safety capacitors and ensure the normal operation of electrical appliances.
Select a reliable manufacturer when purchasing electronic components can avoid a lot of unnecessary trouble. JYH HSU(JEC) (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories are ISO 9000 and ISO 14000 certified.
Post time: Dec-23-2022