Electric detection method of self recovery fuse
In the near future, many engineers have found me asking questions about the electrical testing of the self recovery fuse. So how is the electrical property of the self recovery fuse detected? Today Shenzhen tage electronic technology small I am here to explain the self recovery fuse electrical detection of the problem!
The electric detection process of the self recovery fuse is as follows:
I hold maintenance current
I hold, the largest non action current (maintain current), that is, at the specified ambient temperature (25 degrees, priority), PPTC always maintains the maximum current of its low resistance state.
I hold: maintain current;
V max.: the maximum voltage that can be borne;
T trip: the maximum action time under the specified current;
R: zero power resistance measured at a certain temperature.
I trip: action current;
I max.: the maximum current that can be borne;
P D: steady state power in high resistance state;
R 1max.: the maximum resistance measured at room temperature after action or back welding for one hour.
We look at the internal structure of the device, as shown in Figure 4, the test box will be placed in the test sample and the specified temperature conditions, the PPTC are connected to the constant current source and voltage source, and the current value preset to the specified I hold, and the voltage limited to V Max 90%, PPTC measurement the specified time in the specification after the end of the voltage and record, PPTC should not enter the action state. We are to determine the general specification, the power in the I hold 1H 1h to maintain, cooling, retest zero power resistance R, R should be met: Rmin = R = R1max.
Well, today‘s self recovery fuse‘s electrical detection is finished. As an engineer, do you know the problem of electrical detection of self recovery fuse? If you have any questions, can consult online Shenzhen electronic information technology website from the manager! Of course, other questions can be consulted. I wish you a happy life and no trouble!