System and method for testing fuse response time

Abstract

A fuse operate time test system comprises a control circuit, a feedback circuit, a microprocessor and a seven-segment display, wherein, the control circuit is used to obtain the test voltage of to-be-tested fuse; when the test voltage is higher than a preset voltage, the feedback circuit is used to generate external interrupt signal and outputs the external interrupt signal to the microprocessor through the port P12; the microprocessor is used to output high electric frequency and low electric frequency through the port P3 to switch on and switch off the control circuit, and receives the external interrupt signal generated by the feedback circuit; meanwhile, the microprocessor, which generates clock pulse and counts each clock pulse, converts the count value into a time value and outputs the time value through the port P0, the portP1 and the port P2; the seven-segment display, which is used to receive the time value output from the microprocessor, displays the operate time of the to-be-tested fuse according to the time value. The invention also provides a fuse operate time test method. With the invention, a user only needs to switch on the control circuit and completes precise test of the operate time of the to-be-tested.

Description

technical field [0001] The invention relates to a fuse testing system and method, in particular to a fuse operating time testing system and method. Background technique [0002] Fuses have a positive temperature coefficient effect and can be widely used in protective circuits for computer peripherals, rechargeable batteries, power supplies, automotive electronics, and telecommunication equipment. Etc. The fuse is a nonlinear component, and its operating protection characteristics are usually given in the form of empirical curves. Users usually use the look-up table method to select the application range. It is necessary to test whether the operating time (time totrip) of the applied product is within the allowable range, so that It is inconvenient to use and has large errors. [0003] The application range of various types of fuses is different, and the action time of their design is also different, and the key to avoiding short-circuit faults for various products is to li...

AI Technical Summary

Problems solved by technology

However, it is extremely inconvenient to use an oscilloscope to operate, and it needs to be operated by personnel familiar with oscilloscope operation, and it is not suitable for long-term testing. When the oscilloscope head touches and disconnects the product under test, there is generally an error in the test action time

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