Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Why hot hot aluminum electrolytic capacitor?

by:Shenmao     2020-10-31
Upright electrolytic capacitor itself is not hot, but after the access to the circuit board are basically get hot hot, actually cause capacitive heating hot main reason can be divided into three kinds: 1 ripple current is too large. 2 capacitance pressure is too high. 3 outside temperature is too high. Generally can be divided into the three reasons, in the scope of heat-resistant - a capacitor 40℃- So if ripple current is too large, between 105 ℃ can be multiple capacitors in parallel to share the ripple circuit. For your specific points to each point below what is the reason? Ripple is one of the cause of spontaneous thermal capacitance, capacitance charge library role, when the voltage increases, they are charging. To load voltage reduction, they discharge, They essentially to play the role of a smooth signal. When there is the dc voltage ripple voltage of capacitor, the capacitor will experience changes in voltage, and according to the applying of the power supply, may also have a change of current, as well as the continuous and intermittent pulse power. Why regardless of the input form, the change of capacitance electric field experience will lead to the dipole oscillation in the dielectric material, so as to generate heat. This is known as spontaneous thermal reaction behavior, dielectric properties is become one of the important indicators of the main causes of, because any parasitic resistance ( ESR) Or inductance ( ESL) Will increase energy consumption. In addition, before we consider the ripple we must pay attention to the heat produced by applied dc bias. Capacitance is not ideal device, a parasitic phenomenon is jumper dielectric material parallel resistance ( RLi) , the resistance would lead to the occurrence of leakage current. This small DC current can cause fever, but I don't like other typical application state of ripple, the fever is usually negligible. When the work voltage exceeds maximum withstand voltage, reverse polarity capacitance, capacitance capacitor dielectric insulating performance degradation, and so on and so forth, capacitance fever is mainly caused by leakage current at this time. To sum up the main factor causing aluminum electrolytic capacitor fever is superimposed on the dc ripple. Popular point is not enough pressure or internal leakage. But there are ways to address, such as the ripple current is too large, we can more than shunt capacitance to share the ripple circuit, if the pressure value is not enough can share the total voltage series multiple capacitor. The above is the reason why the capacitance fever burning, if you have a good introduction to welcome in the article the following message.
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