Design of intelligent tantalum capacitor separator

In order to improve the reliability of tantalum capacitor use, extend the service life, in the factory before aging treatment, often passes in front of the tantalum capacitor into aging furnace, part of leakage current has been overweight may be removed, can reduce the tantalum capacitor insurance tube wastage during the process of aging, improve the speed of aging furnace heating, pressure, in order to achieve the above requirements, the original use of MSI digital integrated circuit design of tantalum capacitor leakage current, on the basis of automatic sorter using single-chip computer AT89C51 is designed intelligent tantalum capacitor sorter, and eliminates automatically increases the tantalum capacitor, percent of pass statistics, printing, etc.

1. Structure of the separator

The structure of the separator consists of 50 tantalum capacitor leakage current acquisition circuit, common amplifier, voltage comparator, digital potentiometer and other parts of the data acquisition circuit, which can be used to complete the batch detection of 50 tantalum capacitor leakage current. The data processing circuit is composed of in-place detection switch, clamping motor, shear stepping motor, keyboard, printer, display and other parts, and the testing, clamping measurement, automatic elimination, statistics, display and printing functions of 50 tantalum capacitors placed on a fixed cardboard strip in sequence are completed under the control of AT89C51.

2. Working principle of the separator

Sorter power-on reset and run after initialization program, LED display shows P, enter a state of monitor, the keyboard input the nominal value of the tantalum capacitor under test, after the calculation of AT89C51, provide data to digital potentiometer, and change the digital potentiometer of partial pressure ratio, make the output voltage of the threshold voltage of the comparator need, at this point, the sorter has reached the awaited test status, when placed on the test mould in position switch detected with cardboard has been in place of the signal of tantalum capacitor, AT89C51 send clamping machine instructions, Make it drive the actuator to attach the pins of 50 tantalum capacitors placed on the cardboard in sequence to the test mold, connect the charging circuit composed of each tantalum capacitor to be tested and the corresponding sampling resistance, and start charging the tantalum capacitors. After a period of time after charging time, AT89C51 send 50 selected 1 multi-channel analog switch address scanning signal, quickly complete for 50 tantalum capacitor charging voltage of time-sharing acquisition, amplification and comparison operation, if the tantalum capacitor leakage current exceeds bid, the sampling voltage and reference voltage is provided by the digital potentiometer, voltage comparator output low level, on the other hand, the output high level. After collecting the leakage current signal of 50 tantalum capacitors, the single-chip microcomputer AT89C51 processes the collected data and sends instructions to the stepping motor to drive the shearing manipulator to eliminate the tantalum capacitors with excessive leakage current. When the elimination process is completed, AT89C51 sends instructions to the clamping motor to loosen the cardboard strip, clamping motor and stepping motor reset, so that the sorting process is completed.