Life estimation method (Life Expectancy) : aluminum electrolytic capacitor under the highest working temperature, sustainable work time.
Lx = Lo * 2 (the To - Ta) / 10
Lx = actual working life
Lo = life cycle
To = highest working temperature (85 ℃ or 105 ℃)
Ta = capacitor working surrounding temperature
Example: the standard value of 105 ℃ / 105 hours
55 ℃ life estimate: Lx = 1000 * 2 (105-55) / 10
The actual working life: 32000 hours
High temperature Load (Load Life electrolytic capacitor Life under the highest working temperature, plus the rated working voltage, the time after the completion of the continuous regulation shall comply with the following changes:
Δ electrolytic capacitance rate: the value of less than 20% before test
Tan delta: the early features specification values below 200%
LC leakage current: the early features below the specification values (typically for testing) in a minute
High temperature place Life (Shelf Life) : electrolytic capacitor under the highest working temperature, the time after the completion of the continuous regulation shall comply with the following changes:
Δ electrolytic rate: the value of less than 20% before test
Tan delta: the early features specification values below 200%
LC leakage current: the early features below the specification values
Hot charging and discharging Test (Charge/Discharge Test) will be under the highest working temperature, electrolytic capacitor with rated voltage, the Charge for 30 seconds after Discharge 330 seconds for a cycle, so after 1000 cycles, shall comply with the following changes:
Δ electrolytic capacitors: the value of less than 10% before test
Tan delta: the early features specification values below 175%
LC: the early features below specification values
Ripple load test (Ripple Life) will electrolytic capacitor under the highest working temperature, and maximum Ripple current and dc voltage (dc voltage + = rated the most big wave voltage peak voltage), the time after the completion of the continuous regulation shall comply with the following changes:
Δ cap: the value of less than 20% before test
Tan delta: the early features specification values below 200%
LC: the early features below specification values
Commonly used electrolytic formula
Capacitive reactance XC = 1 / (2 PI fC) [Ω]
Impedance: XL = 2 PI fL Ω 】 【
ESR2 impedance: Z =) + (XL - XC) 2 [Ω]
Ripple current: IR =) (beta A delta T/ESR) [mArms]
Power: P = I2ESR [W]
Resonance frequency: fo = 1 / (LC) 2 PI) [Hz]
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