电路中电容的种类有很多种，其中最主要的就是起到电源滤波的作用，电容通电后一般都会有一点发热的现象，但如果温度很高的话就要立马检查电容或者电路板周边的电路了。

　　There are many kinds of capacitors in the circuit, the most important of which is to play the role of power filter. After the capacitor is electrified, there will be a little heat phenomenon, but if the temperature is very high, you should immediately check the capacitor or circuit board around the circuit.

　　大部分功放在放送音乐时动态大，导致电流大小变化相差很大，电源变压器的电流输出能力不强，就导致电容器在大动态的时候要不断地进行充放电，而当电容器的体积较小或者内阻较大时，就会因为充放电速度跟不上，然后电容器上的铝电解就长时间处在工作负载状态，就很容易使电容器的温度上升了。

　　Most power amplifiers have large dynamic when playing music, which leads to great difference in current size. The current output capacity of power transformer is not strong, which leads to continuous charging and discharging of capacitor in large dynamic state. When the volume of capacitor is small or internal resistance is large, the charging and discharging speed will not keep up with it, and then the aluminum electrolysis on the capacitor will be in negative working condition for a long time Load state, it is easy to make the capacitor temperature rise.

　　在功放通电后电容发热情况比较严重的话，首先应排除是否因电容品质存在问题，耐压是否足够等等，如果是原电路中使用的电容出现了问题，电解电容厂家告诉您可以通过下面这些方法进行排除。

　　If the capacitor heating is serious after the power amplifier is powered on, first of all, you should exclude whether there is a problem with the quality of the capacitor and whether the withstand voltage is sufficient. If there is a problem with the capacitor used in the original circuit, the electrolytic capacitor manufacturer tells you that you can remove it by the following methods.

　　第一种情况电容是否长时间工作在高温环境，造成内部压力过大，电解液干枯，已经接近失效状态，这种情况可以将电容拆下后进行容量测试。

　　In the first case, whether the capacitor has been working in a high temperature environment for a long time, resulting in excessive internal pressure and electrolyte drying up, which is close to the failure state. In this case, the capacitance can be removed for capacity test.

　　第二种情况考虑是否是整流电路中的二极管存在问题，造成整流后的波动出现畸变，建议使用示波器观察输出波形是否正常。

　　In the second case, it is considered whether the diode in the rectifier circuit has a problem, resulting in the wave distortion after rectification. It is recommended to use an oscilloscope to observe whether the output waveform is normal.

　　第三种情况要考虑负载部分电路是否存在问题，负载功耗增大或者存在类似短路状态，会引起电容温度升高。

　　In the third case, we should consider whether there are problems in the load circuit. The increase of load power consumption or the existence of similar short circuit state will cause the temperature rise of capacitor.

　　其中开关电源对输出端滤波电容器要求特别高，使用的都是低内阻的高速电解电容器，这也就说明我们再平时使用电容器的时候，为保证电路板能正常运作都购买那种低内阻的高速电解，另外呢要挑选相同容量的电解电容器体积稍大的。

　　Among them, the switching power supply requires high-speed electrolytic capacitors with low internal resistance at the output end, which means that when we use capacitors at ordinary times, in order to ensure the normal operation of the circuit board, we buy the high-speed electrolysis with low internal resistance. In addition, we should choose the electrolytic capacitor with the same capacity with a slightly larger volume.