First of all, we have to confirm whether the electrolytic capacitor
to be activated is damaged. We can measure the electrolytic capacitor to be activated with a multimeter. When the forward resistance is zero or very small, it means that the electrolytic capacitor has been broken down and scrapped. All other electrolytic capacitors can be activated. It can be activated after confirming that the electrolytic capacitor can still be used. Take a 450V electrolytic capacitor as an example. After the electrolytic capacitor is welded, we first add half voltage and activate it for 24 hours before disconnecting the AC power supply. Use a 5W300Ω resistor to connect to both ends of the electrolytic capacitor to discharge. Finish. Then we use the capacitance meter to measure the recovery of the capacity. Generally, it can recover about 60%. For the capacity that has not recovered at all, it can be basically judged that the electrolytic capacitor has been broken and damaged. We can also adjust the voltage to 220V. At this time, the DC voltage across the electrolytic capacitor is about 220Vx1.4u003d300V. Continue to activate for 24 hours. At this time, the capacity can be restored to 90% to 100%. After the above activation treatment, the electrolytic capacitor can generally be restored to the nominal capacity, and the drain electrode is small.
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