The reasons why the inverter capacitor explodes can be attributed to the following main factors:
Excessive ambient temperature : Any capacitor has requirements for the temperature of its operating environment. If it exceeds its allowable limit, the capacitor may explode. This is because high temperature will cause the performance of the insulating material inside the capacitor to deteriorate, and eventually cause the capacitor to fail or explode.
Unstable voltage : The capacitor may be damaged due to overvoltage if the voltage fluctuates violently or operates beyond the rated voltage range for a long time, especially when the voltage change rate exceeds ±15% of the rated voltage. In addition, unstable voltage may also cause current fluctuations inside the capacitor, which in turn causes abnormal response of the capacitor, and eventually causes explosion. The presence of harmonic current : Harmonic sources in the power grid (such as medium frequency furnaces) will cause waveform distortion of circuit voltage and current. The presence of harmonic current will cause abnormal noise in the capacitor, and in severe cases, it will cause the capacitor to swell or even explode. Harmonic current will be superimposed on the fundamental current, increase the total current of the capacitor, and even cause parallel resonance, so that the current flowing into the capacitor will increase exponentially, resulting in overload and explosion.
Damage to electrolytic capacitors: During the assembly process, if the electrolytic capacitor is damaged, it is easy to cause a short circuit and explode during use. In addition, the long-term phase-loss operation of the inverter will also cause the electrolytic capacitor to explode; setting phase-loss protection can effectively prevent this situation.
Poor quality of components: If the electrolytic capacitor itself is of poor quality, such as large leakage current, large loss, insufficient voltage resistance, impurities, etc., it will also cause capacitor damage. In addition, if the rectifier bridge before filtering is damaged, the AC power will directly enter the capacitor, which will also cause capacitor damage.
Poor heat dissipation environment: If the heat dissipation environment of the capacitor is not good, the temperature rise is too high, and the capacitor will be damaged under long-term operation. A good heat dissipation environment is crucial for the long-term stable operation of the capacitor.
In order to prevent the inverter capacitor from bursting, the following measures can be taken:
..The temperature of the inverter and its surrounding environment is within the allowable range.
Stabilize the voltage to avoid excessive voltage fluctuations.
Monitor the harmonic content in the power grid and take filtering measures when necessary.
Improve the assembly quality of the electrolytic capacitor to avoid damage.
Use high-quality electrolytic capacitors and rectifier bridge components.
..Good heat dissipation environment to prevent over-temperature.
The above measures can effectively prevent the problem of inverter capacitor explosion and ensure the normal operation and performance of the equipment.