Amplifier tube screening instrument

Abstract

The invention discloses a power tube screening instrument. The screen instrument comprises a power source, a functional keyboard, a display panel, a singlechip 13, a singlechip 15 and a main control panel, wherein the main control panel comprises a withstand voltage testing circuit. The connection mode is as follows: the singlechip 13 inputs signals to a relay driving circuit in the withstand voltage testing circuit; pole c of a dynatron Q21 is connected with one end of each of a relay coil respectively; the other ends of the relay coils are earthed; poles G, D and S corresponding to the interface of the power tube are connected with one end of each of relays K4, K5 and K6 respectively; a voltage comparator U5A outputs signals to the singlechip 13; an amplifier U3B magnifies Vbrprt signals to make FET Q1 conduct; K19 is actuated through the relay driving circuit; a high voltage power supply outputs voltage to charge a capacitor through a resistor R50; and a voltage follower U3A outputs signals to the singlechip 15. The power tube screening instrument has the advantages of high efficiency of testing, high precision, good stability, strong anti-interference capability, and is suitable to be used in a workshop.

Description

technical field [0001] The invention relates to a testing device in the electronic field, in particular to a screening instrument for testing the parameter performance of a power tube. Background technique [0002] Due to its excellent performance, power MOS tubes have been widely used in electronic ballasts, energy-saving lamps and various circuits. However, the testing, screening, and matching of power MOS tubes have always been difficult; and from the circuit board The disassembled power MOS tube also needs to be tested for the performance of various parameters. If the turn-on voltage, withstand voltage value, transconductance, channel resistance, and input capacitance are all within the specified range, it can be used again, thereby saving costs. Now In the existing technology, digital multimeters are often used to measure the performance of various parameters of power MOS tubes. The parameters measured by digital multimeters are inaccurate, and the efficiency is low, an...

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Problems solved by technology

[0002] Due to its excellent performance, power MOS tubes have been widely used in electronic ballasts, energy-saving lamps and various circuits. However, the testing, screening, and matching of power MOS tubes have always been difficult; and from the circuit board The disassembled power MOS tube also needs to be tested for the performance of various parameters. If the turn-on voltage, withstand voltage value, transconductance, channel resistance, and input capacitance are all within the specified range, it can be used again, thereby saving costs. Now In the existing technology, digital multimeters are often used to measure the performance of various parameters of power MOS tubes. The parameters measured by digital multimeters are inaccurate, and the efficiency is low, and the power MOS tubes cannot be reused, which will increase the cost of the product virtually; due to the lack of Corresponding inspection methods, many companies cannot effectively monitor quality, which seriously affects the consistency and reliability of products

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