About surge voltage ratings for aluminum electrolytic capacitors
Surge voltage refers to an abnormal voltage exceeding the rated voltage that occurs transiently due to external factors.
Aluminum electrolytic capacitors are designed to withstand surge voltage up to a certain level but voltage exceeding standards or the long-term application of a surge voltage can cause failure. As a general rule, make sure that the applied voltage does not exceed the rated voltage.
Aluminum electrolytic capacitors are designed to withstand surge voltage up to a certain level but voltage exceeding standards or the long-term application of a surge voltage can cause failure. As a general rule, make sure that the applied voltage does not exceed the rated voltage.
The test parameters for surge voltage performance outlined in Japanese Industrial Standards (JIS) are as follows.
| Test temperature | 15 to 35℃ |
|---|---|
| No. of cycles (1 cycle of charge and discharge) |
1000 times |
| Charge (Surge voltage) | 30sec. |
| Open | 5min. and 30sec. |
| Protective resistor | as required for RC=0.1±0.05sec. |
Surge test circuit drawing
Surge voltage waveform
Surge voltage is generally set as 1.1 to 1.15 times the rate voltage. Definitions are as follows.
| Voltage range | Surge voltage | Remarks |
|---|---|---|
| ≦315V | Rated voltage×1.15 | |
| >315V | Rated voltage×1.1 | +50V at rated voltages above 500V |
※With some series, definitions may differ depending on when the product was developed.
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