| 摘要 |
The proposed device for testing the service life of a group of switching units contains three current transducers, comparators, switching elements, an OR logic element, pulse counters, monostable multivibrators, a functional converter, a digital switching unit, a differentiator, a digital comparator, AND logic elements, and a NOT logic element. The outputs of the current transducers are accordingly connected to the inputs of the of the first, second, and third comparators and the inputs of the first, second, and third switching elements. The outputs of the first, second, and third switching elements are connected to the inputs of the fourth and fifth comparators. The second input of the first pulse counter is connected to the output of the OR logic element. The output of the OR logic element is connected to the input of the differentiator. The output of the differentiator is connected to the first inputs of the 10th, 11th, and 12th AND logic elements. The second inputs of the said logic elements are accordingly connected to the outputs of the first, second, and third monostable multivibrators, and the outputs are accordingly connected to the inputs of the 5th, 6th, and 7th counters. The second input of the digital comparator is connected to the output of the digital switching unit. The first input of the digital switching unit is connected to the output of the functional converter. The second input of the digital switching unit and the input of the functional converter are connected to the output of the first pulse counter. The output of the NOT logic element is connected to the input of the fourth monostable multivibrator. The output of the fourth monostable multivibrator is connected to the control input of the digital switching unit.
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