The service life of aluminum electrolytic capacitor
is used deadline.
So, what's the value?
First of all, we have to understand the failure mode of aluminum electrolytic capacitor.
Basic concepts: failure: refers to the parts lose the function of the original design regulation failure mechanism: physics, chemistry or other cause of failure and process.
Such as overloading, corrosion failure modes, such as: the failure forms, such as open circuit, short circuit, leakage, etc.
Look from the failure mechanism and conditions of use for the service life of aluminum electrolytic capacitor has a great influence.
Environmental conditions such as temperature, humidity, air pressure, vibration, the effects of temperature on life is the biggest of all.
1, surrounding temperature and ambient temperature's influence on the life of life is embodied in capacitance decrease, increase of loss tangent, these phenomena cause the electrolyte from the sealing parts gradually spread to outside.
Performance of time change and the relationship between the ambient temperature can obtain the following formula.
tx / 10 lo:在最高使用温度下,额定施加电压和额定纹波电流重叠时保证寿生命(
To: the products of the highest use temperature (
Tx: temperature (around the actual use of
If we in the capacitance of electric condition good circumstances, can be directly used to estimation of temperature on the capacitor life.
The applied voltage and patch type of life for the vast majority of the machine (
And substrate free-standing (
急- - - - - -
Capacitor, conditions of use at the highest temperature and the rated voltage value of the following situations, the impact of the voltage applied to the acceleration of the acceleration of ambient temperature and ripple current are negligible compared the effect.
Used for high power electronic equipment of screw terminal type (
More than 350 VDC capacitor in high voltage product accounted for the mainstream, because as a conductive oxide film (aluminum electrolytic capacitors
Ripple current to produce hot and can make the temperature rise, so has a great influence for the product life.
So, need to advance to set maximum permissible ripple current value according to different products.
Plus the ripple current of heat can be obtained from the formulas below.
w = ir2 esr + v * * ilw:内部消耗电力ir:纹波电流esr:内部电阻(
The equivalent series resistance)
V: applied voltage IL: leakage current under the highest temperature, the leakage current increases to 20 ℃ for 5 ~ 10 times, but still the Ir acuity, IL is W = Ir2 ESR.
要求出现内部发热和散热达不到平衡的条件,则ir2·r =β* a *狄拉克δtβ:散热常数a:外壳表面积(
D + 4 l)
D: the diameter of the shell (
L: the length of the shell (
Δ T: rising temperatures by ripple current,
A, patch type and part of the guide lines and life estimation of the DC power supply: B, ripple current load: C, screw terminal type D)
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