CN2793738Y - Transistor measuring equipment - Google Patents

Transistor measuring equipment Download PDF

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Publication number
CN2793738Y
CN2793738Y CN 200520020835 CN200520020835U CN2793738Y CN 2793738 Y CN2793738 Y CN 2793738Y CN 200520020835 CN200520020835 CN 200520020835 CN 200520020835 U CN200520020835 U CN 200520020835U CN 2793738 Y CN2793738 Y CN 2793738Y
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China
Prior art keywords
resistance
connects
pin
diode
singlechip chip
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Expired - Fee Related
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CN 200520020835
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Chinese (zh)
Inventor
石广范
闫广明
李季刚
王冠然
成责果
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Heilongjiang University
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Heilongjiang University
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Priority to CN 200520020835 priority Critical patent/CN2793738Y/en
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Abstract

The utility model relates to a transistor measuring apparatus, the utility model discloses an apparatus which can recognize the polarity of each base pin of a transistor and general parameters. The utility model overcomes the defects of complicated structure, big volume and high cost of the exiting transistor measuring apparatus. The utility model is composed of a host computer 1, a control unit 2, a measuring interface circuit 3 and a direct current power supply 4 with adjustable voltage, wherein a communication port of the host computer 1 is connected with a communication port of the control unit 2 through a USB bus, one output end of the control unit 2 is connected with a controlled end of the direct current power supply 4, the other output end of the control unit 2 is connected with an input end of the measuring interface circuit 3, an output end of the measuring interface circuit 3 is connected with an input end of the control unit 2 and an output end of the direct current power supply 4 is connected with a power source end of the measuring interface circuit 3. The control unit 2 respectively acts high-low electrical level on different base pins of the transistor through the measuring interface circuit 3, the attribute of the base pins of the transistor can be distinguished by that a PN section is conducted or is not conducted, when the parameters are measured, the direct current power supply 4 is used. The host computer 1 can adopt a popular type personal computer, therefore the cost of the utility model is reduced, the control unit 2 can adopt an SCM chip with low cost and small volume, the USB bus is used between the host computer 1 and the control unit 2 and the generality of the utility model is enhanced.

Description

Transistor measuring instrument
Technical field:
The utility model relates to a kind of instrument of discerning each pin polarity of transistor and measuring the transistor parameters.
Background technology:
The surveying instrument of conventional transistor parameters generally adopts the complicated hardware circuit to realize, cause finished product price height, function singleness, bulky, usable range and precision are limited.Though also occurred intelligentized transistor measuring instrument device at present, these instruments are many to be core with the special purpose computer and to dispose corresponding special software and the hardware integrated circuit board, because this kind scheme hardware radix is bigger, so volume is still huge, costs an arm and a leg.
The utility model content:
The purpose of this utility model provides a kind of transistor measuring instrument, to overcome the big and defect of high cost of existing transistor measuring instrument device complex structure, volume.The present invention includes host computer 1, control module 2, measure interface circuit 3 and tunable voltage dc power supply 4, the communication port of host computer 1 is connected by the communication port of usb bus with control module 2, an output terminal of control module 2 connects the controlled end of tunable voltage dc power supply 4, another output terminal of control module 2 connects an input end measuring interface circuit 3, the output terminal of measuring interface circuit 3 connects the input end of control module 2, and the output terminal of tunable voltage dc power supply 4 connects the power end of measuring interface circuit 3.When measuring instrument of the present invention is worked, another input end of measuring interface circuit 3 connects tested transistor, according to transistorized PN junction characteristic, be that P knot adds positive voltage and N knot when adding negative voltage, electric current meeting conducting, when N knot add positive voltage, when the P knot adds negative voltage, electric current can conducting, control module 2 applies high-low level at transistorized different pins respectively through measuring interface circuit 3, save P, the N attribute whether conducting just can be differentiated each pin of transistor according to PN, thereby realize differentiating the function of transistor pin polarity.When measuring parameters such as transistorized amplification coefficient, breakdown reverse voltage, reverse leakage current when needs, according to the transistor polarity of having measured, tunable voltage dc power supply 4 is received transistorized respective pin, when changing the output voltage of tunable voltage dc power supply 4 transistorized relevant parameter is changed Input Control Element 2 and just can draw transistorized parameters value.The utility model can also be used to measuring resistance and the voltage stabilizing value of zener diode, the resistance of thermistor etc. of resistance commonly used.Host computer 1 of the present utility model adopts universal personal computer to get final product, therefore reduced the cost of this tester, control module 2 selects for use the singlechip chip that cost is low, volume is little to get final product, and use usb bus between host computer 1 and the control module 2, improved versatility of the present utility model, the utlity model has volume small and exquisite, be easy to carry, easy to install and cheap advantage.
Description of drawings:
Fig. 1 is a structural representation of the present utility model, and Fig. 2 is an electrical block diagram of the present utility model.
Embodiment:
Embodiment one: specify present embodiment below in conjunction with Fig. 1.Present embodiment is made up of host computer 1, control module 2, measurement interface circuit 3 and tunable voltage dc power supply 4, the communication port of host computer 1 is connected by the communication port of usb bus with control module 2, an output terminal of control module 2 connects the controlled end of tunable voltage dc power supply 4, another output terminal of control module 2 connects an input end measuring interface circuit 3, the output terminal of measuring interface circuit 3 connects the input end of control module 2, and the output terminal of tunable voltage dc power supply 4 connects the power end of measuring interface circuit 3.
Embodiment two: specify present embodiment below in conjunction with Fig. 2.The difference of present embodiment and embodiment one is: control module 2 is selected singlechip chip U1 for use, the model of singlechip chip U1 is PIC16C765, the pin 23 of singlechip chip U1 is connected host computer 1 with pin 24 by usb bus, measure interface circuit 3 by the 23 resistance R 23, the 24 resistance R 24, the 25 resistance R 25, a relay J 1, No. two relay J 2, No. three relay J 3, the second diode N2, the 3rd diode N3, the 4th diode N4 and slot J6 form, one end of the 23 resistance R 23 connects the pin 19 of singlechip chip U1, the other end of the 23 resistance R 23 connects the pin 2 of singlechip chip U1 and the normally closed contact of a relay J 1, the end of the solenoid K1 of a relay J 1 connects the negative electrode of the power supply VCC and the second diode N2, the other end of solenoid K1 connects the anode of the second diode N2 and the pin 8 of singlechip chip U1, one end of the 24 resistance R 24 connects the pin 20 of singlechip chip U1, the other end of the 24 resistance R 24 connects the pin 3 of singlechip chip U1 and the normally closed contact of No. two relay J 2, the end of the solenoid K2 of No. two relay J 2 connects the negative electrode of power supply VCC and the 3rd diode N3, the other end of solenoid K2 connects the anode of the 3rd diode N3 and the pin 9 of singlechip chip U1, one end of the 25 resistance R 25 connects the pin 21 of singlechip chip U1, the other end of the 25 resistance R 25 connects the pin 4 of singlechip chip U1 and the normally closed contact of No. three relay J 3, the end of the solenoid K3 of No. three relay J 3 connects the negative electrode of power supply VCC and the 4th diode N4, the other end of solenoid K3 connects the static contact of 10, numbers relay J 1 of pin of the anode of the 4th diode N4 and singlechip chip U1, the static contact of the static contact of No. two relay J 2 and No. three relay J 3 is connected on three pins of slot J6;
Tunable voltage dc power supply 4 is by transformer T1, rectification circuit U2, triode Q1, first capacitor C 1, second capacitor C 2, the 5th diode N5, the 30 resistance R 30, the 29 resistance R 29, the 28 resistance R 28, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6 are formed, one end on the former limit of transformer T1 connects the negative electrode of power supply VCC and the 5th diode N5, the anode of the 5th diode N5 connects an end of the 30 resistance R 30 and the collector of triode Q1, the other end of the 30 resistance R 30 connects the other end on the former limit of transformer T1, the base stage of triode Q1 connects an end of the 29 resistance R 29 and an end of the 28 resistance R 28, the other end of the 29 resistance R 29 connects emitter and the ground connection of triode Q1, the other end of the 28 resistance R 28 connects the pin 17 of singlechip chip U1, the two ends of transformer T1 secondary connect two input ends of rectification circuit U2 respectively, the cathode output end of rectification circuit U2 connects the positive pole of first capacitor C 1, one end of the positive pole of second capacitor C 2 and the 4th resistance R 4, the cathode output end of rectification circuit U2 connects the negative pole of first capacitor C 1, the negative pole of second capacitor C 2 and ground connection, the other end of the 4th resistance R 4 connects the normally opened contact of a relay J 1, the normally opened contact of No. two relay J 2, one end of the normally opened contact of No. three relay J 3 and the 5th resistance R 5, the other end of the 5th resistance R 5 connects the pin 5 of singlechip chip U1 and an end of the 6th resistance R 6, the other end ground connection of resistance R 6.
If in slot J6, insert a crystal diode, realize by control module 2 and the measurement interface circuit transistorized both positive and negative polarity of 3 identifications following steps by way of example with the software in the host computer 1: the pin 8 of (1) singlechip chip U1, pin 9 and pin 10 are general I/O pin, when identification, all be changed to high level (logical one), the pin 19 of singlechip chip U1, pin 20 and pin 21 are general I/O pin, is the pin 2 of singlechip chip U1, pin 3 and pin 4 usefulness software setting A/D conversion input pin, and reference voltage is+5V.(2) allow pin 19 output+5V, pin 20 output 0V, the pin 21 of U1 be changed to input (this pin is a high-impedance state at input state), the A/D transformation result that at this moment reads on the pin 3 is 0V; (3) allow pin 20 output+5V, pin 19 output 0V, the pin 21 of U1 be changed to input (this pin is a high-impedance state at input state) then, at this moment the A/D transformation result of the pin 2 of U1 is 0V, and hence one can see that, between 1,2 pins of slot J6 for opening circuit; (4) allow pin 20 output+5V, pin 21 output 0V, the pin 19 of U1 be changed to input (this pin is a high-impedance state at input state), at this moment the A/D transformation result of pin 4 is 0V; (5) allow pin 21 output+5V, pin 20 output 0V, the pin 19 of singlechip chip U1 be changed to input (this pin is a high-impedance state at input state) then, at this moment the A/D transformation result of pin 3 is not 0V, and hence one can see that, is path between 2,3 pins of slot J6, and unidirectional conducting, be PN junction; (6) allow the pin 21 output+5V of singlechip chip U1, pin 19 export 0V, pin 20 high resistants, at this moment the A/D transformation result of pin 2 is 0V, allows pin 19 output+5V, pin 21 export 0V, pin 20 high resistants then, and at this moment pin 4A/D transformation result is 0V, hence one can see that, between 1,3 pins of slot J6 for opening circuit; So in fact judged the positive and negative electrode of diode.So just the different PN junction characteristic that has separately according to them just can be judged different electron devices.Can also be according to the parameter of the outcome measurement different components of judging, as: the resistance of resistance commonly used, the voltage stabilizing value of zener diode etc.And the triode pin is differentiated identical with diode pin discrimination principles, and triode can be regarded 2 diodes that link together as.The measurement of voltage breakdown is to carry out on the basis that pin is differentiated, and after the collector of triode, emitter, base stage had been determined, the principle that reverse pressurization has snowslide phenomenon according to P, N knot was measured voltage breakdown.Now illustrate: on J6, insert a transistor, the emitter of triode, base stage and collector be pin 19, pin 20 and the pin 21 of corresponding singlechip chip U1 respectively, collector---the base break down voltage when the measurement emitter current is zero: the pin 19 of (1) singlechip chip U1 is changed to input (this pin is a high-impedance state at input state), pin 20 is changed to input (this pin is a high-impedance state at input state), pin 21 output 0V, pin 9 output 0V (relay J 2 of pin 20 correspondences switches to high-pressure side).(2) imported the primary voltage value in 0.1 second and in single-chip microcomputer, carry out an A/D conversion by pin 5 every intervals of singlechip chip U1, obtaining the A/D transforming numerical subtracts each other with numerical value last time, up to subtracting each other the result is 0, promptly reaches the snowslide flex point, and this voltage is this P, N junction breakdown voltage.---principle of base break down voltage Vcbo is identical for the collector---principle of emitter voltage breakdown and test set electrode---when base break down voltage is zero with base current for emitter when the measurement collector current is zero.The measurement of reverse leakage current also is to carry out on the basis that pin is differentiated, after knowing the collector, emitter, base stage of triode, reverse pressurization has the principle of snowslide phenomenon according to P, N knot, can measure voltage breakdown, and a period of time before snowslide, P, N economize on electricity stream should be stable, and Nei current value is called as reverse leakage current during this period of time.Just can obtain reverse leakage current with the breakdown reverse voltage that records divided by sample resistance.
Embodiment three: specify present embodiment below in conjunction with Fig. 2.The difference of present embodiment and embodiment two is: it also comprises warning circuit 6, warning circuit 6 is made up of the 3rd resistance R 3, field effect transistor M11 and light emitting diode N1, one end of the 3rd resistance R 3 connects an end of the 5th resistance R 5, the other end of the 3rd resistance R 3 connects the drain electrode of field effect transistor M11, the source ground of field effect transistor M11, the negative electrode of the grid sending and receiving optical diode N1 of field effect transistor M11, the pin 29 of the anode order sheet machine chip U1 of light emitting diode N1.Other composition is identical with embodiment two with annexation.When parameters such as the amplification coefficient of test transistor, breakdown reverse voltage, reverse leakage current, the tunable voltage dc power supply 4 of this testing tool is switched on work, and high voltage direct current is dangerous to the people, so provide warning function by light emitting diode N1 to the people.

Claims (5)

1, transistor measuring instrument, it is characterized in that it comprises host computer (1), control module (2), measuring interface circuit (3) and tunable voltage dc power supply (4) forms, the communication port of host computer (1) is connected by the communication port of usb bus with control module (2), an output terminal of control module (2) connects the controlled end of tunable voltage dc power supply (4), another output terminal of control module (2) connects an input end measuring interface circuit (3), the output terminal of measuring interface circuit (3) connects the input end of control module (2), and the output terminal of tunable voltage dc power supply (4) connects the power end of measuring interface circuit (3).
2, transistor measuring instrument according to claim 1 is characterized in that control module (2) selects singlechip chip (U1) for use, and the pin 23 of singlechip chip (U1) is connected host computer (1) with pin 24 by usb bus.
3, transistor measuring instrument according to claim 2, it is characterized in that measuring interface circuit (3) by the 23 resistance (R23), the 24 resistance (R24), the 25 resistance (R25), a relay (J1), No. two relays (J2), No. three relays (J3), second diode (N2), the 3rd diode (N3), the 4th diode (N4) and slot (J6) are formed, one end of the 23 resistance (R23) connects the pin 19 of singlechip chip (U1), the other end of the 23 resistance (R23) connects the pin 2 of singlechip chip (U1) and the normally closed contact of a relay (J1), one end of the solenoid (K1) of a relay (J1) connects the negative electrode of power supply (VCC) and second diode (N2), the other end of solenoid (K1) connects the anode of second diode (N2) and the pin 8 of singlechip chip (U1), one end of the 24 resistance (R24) connects the pin 20 of singlechip chip (U1), the other end of the 24 resistance (R24) connects the pin 3 of singlechip chip (U1) and the normally closed contact of No. two relays (J2), one end of the solenoid (K2) of No. two relays (J2) connects the negative electrode of power supply (VCC) and the 3rd diode (N3), the other end of solenoid (K2) connects the anode of the 3rd diode (N3) and the pin 9 of singlechip chip (U1), one end of the 25 resistance (R25) connects the pin 21 of singlechip chip (U1), the other end of the 25 resistance (R25) connects the pin 4 of singlechip chip (U1) and the normally closed contact of No. three relays (J3), one end of the solenoid (K3) of No. three relays (J3) connects the negative electrode of power supply (VCC) and the 4th diode (N4), the other end of solenoid (K3) connects the static contact of 10, numbers relays of pin (J1) of the anode of the 4th diode (N4) and singlechip chip (U1), the static contact of the static contact of No. two relays (J2) and No. three relays (J3) is connected on three pins of slot (J6).
4, transistor measuring instrument according to claim 3, it is characterized in that tunable voltage dc power supply (4) is by transformer (T1), rectification circuit (U2), triode (Q1), first electric capacity (C1), second electric capacity (C2), the 5th diode (N5), the 30 resistance (R30), the 29 resistance (R29), the 28 resistance (R28), the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6) are formed, one end on the former limit of transformer (T1) connects the negative electrode of power supply (VCC) and the 5th diode (N5), the anode of the 5th diode (N5) connects an end of the 30 resistance (R30) and the collector of triode (Q1), the other end of the 30 resistance (R30) connects the other end on the former limit of transformer (T1), the base stage of triode (Q1) connects an end of the 29 resistance (R29) and an end of the 28 resistance (R28), the other end of the 29 resistance (R29) connects the emitter and the ground connection of triode (Q1), the other end of the 28 resistance (R28) connects the pin 17 of singlechip chip (U1), the two ends of transformer (T1) secondary connect two input ends of rectification circuit (U2) respectively, the cathode output end of rectification circuit (U2) connects the positive pole of first electric capacity (C1), one end of the positive pole of second electric capacity (C2) and the 4th resistance (R4), the cathode output end of rectification circuit (U2) connects the negative pole of first electric capacity (C1), the negative pole and the ground connection of second electric capacity (C2), the other end of the 4th resistance (R4) connects the normally opened contact of a relay (J1), the normally opened contact of No. two relays (J2), one end of the normally opened contact of No. three relays (J3) and the 5th resistance (R5), the other end of the 5th resistance (R5) connects the pin 5 of singlechip chip (U1) and an end of the 6th resistance (R6), the other end ground connection of the 6th resistance (R6).
5, transistor measuring instrument according to claim 4, it is characterized in that it also comprises warning circuit (6), warning circuit (6) is made up of the 3rd resistance (R3), field effect transistor (M11) and light emitting diode (N1), one end of the 3rd resistance (R3) connects an end of the 5th resistance (R5), the other end of the 3rd resistance (R3) connects the drain electrode of field effect transistor (M11), the source ground of field effect transistor (M11), the negative electrode of the grid sending and receiving optical diode (N1) of field effect transistor (M11), the pin 29 of the anode order sheet machine chip (U1) of light emitting diode (N1).
CN 200520020835 2005-05-18 2005-05-18 Transistor measuring equipment Expired - Fee Related CN2793738Y (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100370268C (en) * 2005-05-18 2008-02-20 黑龙江大学 Transistor measuring instrument
CN101986167A (en) * 2010-10-25 2011-03-16 北京佳讯飞鸿电气股份有限公司 Method for quickly identifying and classifying triodes
CN102854448A (en) * 2012-10-09 2013-01-02 浙江工贸职业技术学院 Device for automatically distinguishing polarity, pin arrangement and hfe of audion
CN103487736A (en) * 2013-09-18 2014-01-01 大唐移动通信设备有限公司 Method and device for detecting TVS pipe
CN113805030A (en) * 2021-09-24 2021-12-17 桂林航天工业学院 Transistor parameter intelligent detection system based on singlechip

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100370268C (en) * 2005-05-18 2008-02-20 黑龙江大学 Transistor measuring instrument
CN101986167A (en) * 2010-10-25 2011-03-16 北京佳讯飞鸿电气股份有限公司 Method for quickly identifying and classifying triodes
CN101986167B (en) * 2010-10-25 2014-04-23 北京佳讯飞鸿电气股份有限公司 Method for quickly identifying and classifying triodes
CN102854448A (en) * 2012-10-09 2013-01-02 浙江工贸职业技术学院 Device for automatically distinguishing polarity, pin arrangement and hfe of audion
CN102854448B (en) * 2012-10-09 2014-08-27 浙江工贸职业技术学院 Device for automatically distinguishing polarity, pin arrangement and hfe of audion
CN103487736A (en) * 2013-09-18 2014-01-01 大唐移动通信设备有限公司 Method and device for detecting TVS pipe
CN103487736B (en) * 2013-09-18 2015-10-14 大唐移动通信设备有限公司 A kind of method and device detecting TVS pipe
CN113805030A (en) * 2021-09-24 2021-12-17 桂林航天工业学院 Transistor parameter intelligent detection system based on singlechip
CN113805030B (en) * 2021-09-24 2023-09-05 桂林航天工业学院 Transistor parameter intelligent detection system based on singlechip

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