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Factors Affecting the Life of Electrolytic Capacitors (3)
Author：本站Release time：2018-12-17 10:52:39Browsing：
In addition, direct contact between extended cathode aluminum foil and capacitor aluminum shell is also a good way to reduce thermal resistance. At the same time, it should be noted that the aluminum shell will be negatively charged and can not be used as a negative connection.
Capacitance must be installed correctly in order to achieve its designed working life. For example, RIFAPEH169 and PEH200 series should be installed vertically or horizontally. At the same time, ensure that the safety valve is up, so that the hot electrolyte and steam can be discharged smoothly from the safety valve when the capacitor fails.
When capacitance arrangement is very compact, the distance between adjacent capacitors should be at least 5 mm to ensure proper air flow. When installing bolts, the control of nut torque is very important. If the screw is too loose, the capacitor and the radiator can not be in close contact; if the screw is too tight, the thread may be damaged. At the same time, it should be noted that capacitors should not be installed upside down, otherwise bolts may be broken.
When installing capacitors, they should be as far away from heating elements as possible. Otherwise, too high temperature will shorten the service life of capacitors, thus making capacitors the shortest part of the whole circuit. In the case of high ambient temperature, forced air cooling should be adopted as far as possible, and the capacitance should be installed at the air intake.
3. The influence of frequency
If the current is composed of fundamental frequency and multiple harmonics, the power loss caused by each harmonic must be calculated, and the total loss value can be obtained by adding the calculated results.
In high frequency applications, the capacitor leads should be as short as possible to reduce the equivalent inductance.
The resonant frequency (fR) of capacitors varies with the type of capacitors. The resonant frequencies of welded and bolted aluminium electrolytic capacitors ranged from 1.5 kHz to 150 kHz. If the capacitor is used at a higher resonant frequency, it is inductive to the external characteristics.
4 Conclusion
In conclusion, the life of electrolytic capacitors can be guaranteed by choosing the right application conditions and environment to avoid abnormal failure.
Capacitance must be installed correctly in order to achieve its designed working life. For example, RIFAPEH169 and PEH200 series should be installed vertically or horizontally. At the same time, ensure that the safety valve is up, so that the hot electrolyte and steam can be discharged smoothly from the safety valve when the capacitor fails.
When capacitance arrangement is very compact, the distance between adjacent capacitors should be at least 5 mm to ensure proper air flow. When installing bolts, the control of nut torque is very important. If the screw is too loose, the capacitor and the radiator can not be in close contact; if the screw is too tight, the thread may be damaged. At the same time, it should be noted that capacitors should not be installed upside down, otherwise bolts may be broken.
When installing capacitors, they should be as far away from heating elements as possible. Otherwise, too high temperature will shorten the service life of capacitors, thus making capacitors the shortest part of the whole circuit. In the case of high ambient temperature, forced air cooling should be adopted as far as possible, and the capacitance should be installed at the air intake.
3. The influence of frequency
If the current is composed of fundamental frequency and multiple harmonics, the power loss caused by each harmonic must be calculated, and the total loss value can be obtained by adding the calculated results.
In high frequency applications, the capacitor leads should be as short as possible to reduce the equivalent inductance.
The resonant frequency (fR) of capacitors varies with the type of capacitors. The resonant frequencies of welded and bolted aluminium electrolytic capacitors ranged from 1.5 kHz to 150 kHz. If the capacitor is used at a higher resonant frequency, it is inductive to the external characteristics.
4 Conclusion
In conclusion, the life of electrolytic capacitors can be guaranteed by choosing the right application conditions and environment to avoid abnormal failure.