Discussion on the Testing Method of Chip Fuses
We know that there are many series of fuses in the electronic component market, including patch fuses. This series of fuses is commonly used in factories, with few being used by individual users. But what should we pay attention to when testing patch fuses? Today, editor Dai Liang, let's take a look together. Firstly, The detection method for patch fuses is recommended to be based on the following aspects: normal current, fusing current, open circuit voltage, short circuit current, impulse current, and ambient temperature.
1. Normal current: Firstly, we must know the normal current flowing through the fuse in the circuit used. Usually, we need to pre-set a derating amount and choose according to the following principle: the normal current must be less than the product of the rated current and the derating coefficient.
2. Fusing current: According to UL specifications, the fuse should quickly fuse at twice the rated current. But in most cases, to ensure reliable fusing, we recommend that the fusing current should be greater than 2.5 times the rated current. In addition, if the fuse time is important, it must also refer to the fuse characteristic diagram provided by the manufacturer to make a judgment.
3. Open circuit voltage: The open circuit voltage should generally be selected to be less than the rated voltage. For example, when using a fuse with a rated voltage of DC24V in an AC100V circuit, it may ignite the fuse or cause it to rupture.
4. Short circuit current: We refer to the maximum current that flows when a circuit is short-circuited as the short circuit current. For various fuses, the rated breaking capacity is specified, and we must be careful not to eXCeed the rated breaking capacity when testing Chip Fuses. If a fuse with a small breaking capacity is selected, it may cause the fuse to rupture or cause a fire.
5. Impulse current: Observe the waveform of the impulse current and calculate its energy using the I²t value. The impact on the fuse varies depending on the size and frequency of the impulse current. The ratio of the I²t value of impulse current to the I²t value of single pulse fusing determines the number of times a fuse can withstand impulse current. (Recommended reading: Can a self-restoring fuse replace a disposable fuse tube?
Fig.1
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