CN104297656A - Automatic judgment circuit for pins of low-power triode - Google Patents
Automatic judgment circuit for pins of low-power triode Download PDFInfo
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- CN104297656A CN104297656A CN201410430901.4A CN201410430901A CN104297656A CN 104297656 A CN104297656 A CN 104297656A CN 201410430901 A CN201410430901 A CN 201410430901A CN 104297656 A CN104297656 A CN 104297656A
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Abstract
The invention discloses an automatic judgment circuit for pins of a low-power triode. The automatic judgment circuit for the pins of the low-power triode comprises a reverse circuit, a single-chip microcomputer control circuit, a current direction detection circuit, a detection signal amplification circuit and a display circuit, wherein the output end of the reverse circuit is connected with the single-chip microcomputer control circuit, the output end of the single-chip microcomputer control circuit is connected with the display circuit and the current direction detection circuit, the output end of the current direction detection circuit is connected with the detected triode and the detection signal amplification circuit, and the output end of the detection signal amplification circuit is connected with the reverse circuit. The automatic judgment circuit for the pins of the low-power triode can rapidly and accurately judge the pins and the type of the low-power triode, displays the judgment result through a corresponding indication circuit, and is more convenient and rapid to use than a multimeter when used for measurement.
Description
Technical field
The present invention relates to a kind of low-power transistor pin automatic decision circuit.
Background technology
At present, in electronic technology, triode uses extremely general a kind of components and parts, and the parameter of triode and the measurement scheme of many electric parameters, measurement result have very close relationship.Therefore, in Electronic Design, the pin of triode, the judgement of type and measure extremely important.The method measuring triode pin has multiple, what wherein laboratory was commonly used is utilize the feature of multimeter and each pin of triode to measure, but due to the voltage between each pin of triode, current relationship complexity, and the small volume of triode own, very big inconvenience is brought to measurement, and in the market also not to the device of triode pin, type automatic discrimination.Therefore, design a can automatic discrimination triode pin, type circuit seem particularly important.
Summary of the invention
The defect that the present invention seeks to exist for prior art provides a kind of low-power transistor pin automatic decision circuit.
The present invention for achieving the above object, adopts following technical scheme: a kind of low-power transistor pin automatic decision circuit, comprises negater circuit, single chip machine controlling circuit, current direction detection circuit, detection signal amplifying circuit and display circuit; The output terminal of described negater circuit is connected with single chip machine controlling circuit; The output terminal of described single chip machine controlling circuit is connected with display circuit and current direction detection circuit respectively; The output terminal of described current direction detection circuit is connected with detected triode and described detection signal amplifying circuit respectively, and the output terminal of described detection signal amplifying circuit is connected with described negater circuit.
Further, described current direction detection circuit comprises magnetic core coil, voltage compare amplifier and controller; Described magnetic core coil output terminal connects the input end of voltage compare amplifier, the input end of the output terminal connection control device of described voltage compare amplifier.
Further, described detection signal amplifying circuit comprises: inverting amplifier circuit, inverting amplifier circuit comprises the first operational amplifier, and the input end of inverting amplifier circuit receives input signal, and the output terminal of inverting amplifier circuit exports the output signal through amplifying; Forward high-frequency filter circuit, forward high-frequency filter circuit comprises the second operational amplifier, forward high-frequency filter circuit has cutoff frequency, forward high-frequency filter circuit is connected between the output terminal of inverting amplifier circuit and input end, and forward high-frequency filter circuit feeds back the component of described output signal medium frequency higher than cutoff frequency to the input end of inverting amplifier circuit.
Further, described inverting amplifier circuit comprises: the first operational amplifier, and negative input end receives input signal, positive input terminal ground connection, and output terminal exports the output signal through amplifying; First resistance R1 and the second resistance R2, the first resistance R1 is connected between the negative input end of the first operational amplifier and forward high-frequency filter circuit, and the second resistance R2 is connected between the first operational amplifier negative input end and output terminal.
Further, the enlargement factor of described inverting amplifier circuit is-R2/R1.
Further, described forward high-frequency filter circuit comprises: the second operational amplifier; 3rd resistance R3 and electric capacity C1, the 3rd resistance R3 and electric capacity C1 is connected between the output terminal of inverting amplifier circuit and the positive input terminal of the second operational amplifier; 4th resistance R4, between the negative input end being connected to the second operational amplifier and output terminal; 5th resistance R5, between the output terminal being connected to the second operational amplifier and inverting amplifier circuit.
Further, the cutoff frequency of described forward high-frequency filter circuit is fc=1/ (2* π * R3*C1).
Further, the resistance of described first resistance R1 is equal with the resistance of the 5th resistance R5; Second resistance R2 is equal with the value of the ratio R4/R3 of the resistance of the 3rd resistance R3 with the 4th resistance R4 with the value of the ratio R2/R1 of the resistance of the first resistance R1.
Beneficial effect of the present invention: triode pin automatic identification circuit of the present invention can judge pin and the type of low-power transistor rapidly and accurately, and demonstrates judged result by corresponding indicating circuit, than measuring a lot convenient and swift with multimeter.
Accompanying drawing explanation
Fig. 1 integrated circuit functional block diagram of the present invention.
Current direction detection circuit theory diagrams in Fig. 2 the present invention.
Fig. 3 signal detection amplifying circuit schematic diagram of the present invention.
embodiment
Shown in Fig. 1, relate to a kind of low-power transistor pin automatic decision circuit, comprise negater circuit, single chip machine controlling circuit, current direction detection circuit, detection signal amplifying circuit and display circuit; The output terminal of described negater circuit is connected with single chip machine controlling circuit; The output terminal of described single chip machine controlling circuit is connected with display circuit and current direction detection circuit respectively; The output terminal of described current direction detection circuit is connected with detected triode and described detection signal amplifying circuit respectively, and the output terminal of described detection signal amplifying circuit is connected with described negater circuit.
Shown in Fig. 2, be the structural representation of current direction detection circuit, it comprises magnetic core coil 11, voltage compare amplifier 12 and controller 13; Described magnetic core coil 11 output terminal connects the input end of voltage compare amplifier 12, the input end of the output terminal connection control device 13 of described voltage compare amplifier 12.
During use, first send triad code (level that height is different) by P3.0 ~ P3.2 mouth of single-chip microcomputer, deliver to 1,2, No. 3 pin of triode respectively.For different triodes, when different codings sent by single-chip microcomputer, direction of current 1, on 2, No. 3 pins is different, there is inflow and flow out two kinds of situations, detecting on which direction with two photoelectrical coupler reverse parallel connections has electric current to pass through, and now triad code becomes six binary codes.The electric signal from photoelectrical coupler detected is amplified, due to the signal that now exports and off-gauge low and high level, can not directly by single-chip microcomputer identification, phase place is also undesirable, therefore add one-level phase inverter CD4069 and carry out anti-phase, six binary codes of the standard then exported by phase inverter deliver to P1.0 ~ P1.5 mouth of single-chip microcomputer.The data that single-chip microcomputer writes in advance according to the data read from P1 mouth and single-chip microcomputer inside compare, and when meeting corresponding condition from P3.3 ~ P3.7 mouth output detections result, finally show corresponding triode-type with light emitting diode.
In side circuit test, because common signal detection amplifying circuit exists the measuring error that various high-frequency interferencing signal causes, also exist that efficiency is low, the shortcoming of low precision.Therefore higher to the requirement of signal detection amplifying circuit, need to eliminate this type of error as far as possible.
Shown in Fig. 3, have employed a kind of detection signal amplifying circuit with stronger antijamming capability, it comprises: inverting amplifier circuit, inverting amplifier circuit comprises the first operational amplifier, the input end of inverting amplifier circuit receives input signal, and the output terminal of inverting amplifier circuit exports the output signal through amplifying; Forward high-frequency filter circuit, forward high-frequency filter circuit comprises the second operational amplifier, forward high-frequency filter circuit has cutoff frequency, forward high-frequency filter circuit is connected between the output terminal of inverting amplifier circuit and input end, and forward high-frequency filter circuit feeds back the component of described output signal medium frequency higher than cutoff frequency to the input end of inverting amplifier circuit.
In the particular embodiment, inverting amplifier circuit comprises: the first operational amplifier, and negative input end receives input signal, positive input terminal ground connection, and output terminal exports the output signal through amplifying; First resistance R1 and the second resistance R2, the first resistance R1 is connected between the negative input end of the first operational amplifier and forward high-frequency filter circuit, and the second resistance R2 is connected between the first operational amplifier negative input end and output terminal.The enlargement factor of inverting amplifier circuit is-R2/R1.
Forward high-frequency filter circuit comprises: the second operational amplifier; 3rd resistance R3 and electric capacity C1, the 3rd resistance R3 and electric capacity C1 is connected between the output terminal of inverting amplifier circuit and the positive input terminal of the second operational amplifier; 4th resistance R4, between the negative input end being connected to the second operational amplifier and output terminal; 5th resistance R5, between the output terminal being connected to the second operational amplifier and inverting amplifier circuit.The cutoff frequency of forward high-frequency filter circuit is fc=1/ (2* π * R3*C1).
In an embodiment, the resistance of the first resistance R1 is equal with the resistance of the 5th resistance R5; Second resistance R2 is equal with the value of the ratio R4/R3 of the resistance of the 3rd resistance R3 with the 4th resistance R4 with the value of the ratio R2/R1 of the resistance of the first resistance R1.
In Fig. 3, this signal detection amplifying circuit comprises the first operational amplifier A 1, second operational amplifier A 2, five resistance R1, R2, R3, R4, R5, capacitor C1.First operational amplifier A 1 constitutes inverting amplifier circuit with resistance R1, R2.Input signal is In, and enlargement factor is-R2/R1, output signal Out.Second operational amplifier A 2 and resistance R3, R4, R5, capacitor C1 constitutes forward high-frequency filter circuit.High frequency filter cutoff frequency is fc=1/ (2* π * R3*C1), and the component higher than cutoff frequency fc in output signal Out will feed back to the first operational amplifier A 1 input end again by the second operational amplifier A 2.Be In_H higher than the component of cutoff frequency fc in setting signal In, the component lower than cutoff frequency fc is In_L.
The transport function formula 1 of the first operational amplifier A 1 is expressed as follows:
Out=(In_H+In_L) × (-R2/R1)+Vo2 × (-R2/R5) (formula 1)
The delivery function formula 2 of the second operational amplifier A 2 is expressed as follows:
Vo2=(Out) × R4/R3 (formula 2)
Vo2 is the output of the second operational amplifier A 2, and owing to being wave filter, cutoff frequency is fc, and signal Out only has high-frequency components, namely through the HFS In_H of amplified signal In.
Out=(In_H+In_L) × (-R2/R1)+In_H × (-R2/R1) × R4/R3 × (-R2/R5) is obtained by formula 1 and formula 2.
If R1=R5, R2/R1=R3/R4, then obtain:
Out＝(In_H+In_L)×(-R2/R1)+In_H(R2/R1)
Out＝(+In_L)×(-R2/R1)
Completely eliminate various high frequency interference error, and improve precision further.
In an embodiment, the first operational amplifier A 1 and the second operational amplifier A 2 are all LM062, input resistance R1=R5=10K Ω, R2=100K Ω, R3=10K Ω, and R4=1K Ω, C1=1.59n cutoff frequency is fc=10KHz.
In addition, owing to adopting single-chip microcomputer as centralized control unit in circuit, therefore extensibility is strong.Such as can increase the circuit measuring triode β value on the basis of design, available numeral method goes out β value.In addition, the design can only measure the triode of common middle low power now, if add driving circuit, current-limiting circuit, amendment part source program also can measure large power triode.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a low-power transistor pin automatic decision circuit, is characterized in that, comprises negater circuit, single chip machine controlling circuit, current direction detection circuit, detection signal amplifying circuit and display circuit; The output terminal of described negater circuit is connected with single chip machine controlling circuit; The output terminal of described single chip machine controlling circuit is connected with display circuit and current direction detection circuit respectively; The output terminal of described current direction detection circuit is connected with detected triode and described detection signal amplifying circuit respectively, and the output terminal of described detection signal amplifying circuit is connected with described negater circuit.
2. low-power transistor pin automatic decision circuit as claimed in claim 1, it is characterized in that, described current direction detection circuit comprises magnetic core coil, voltage compare amplifier and controller; Described magnetic core coil output terminal connects the input end of voltage compare amplifier, the input end of the output terminal connection control device of described voltage compare amplifier.
3. low-power transistor pin automatic decision circuit as claimed in claim 2, it is characterized in that, described detection signal amplifying circuit comprises: inverting amplifier circuit, described inverting amplifier circuit comprises the first operational amplifier, the input end of inverting amplifier circuit receives input signal, and the output terminal of inverting amplifier circuit exports the output signal through amplifying;
Forward high-frequency filter circuit, forward high-frequency filter circuit comprises the second operational amplifier, forward high-frequency filter circuit has cutoff frequency, forward high-frequency filter circuit is connected between the output terminal of inverting amplifier circuit and input end, and forward high-frequency filter circuit feeds back the component of described output signal medium frequency higher than cutoff frequency to the input end of inverting amplifier circuit.
4. low-power transistor pin automatic decision circuit as claimed in claim 3, it is characterized in that, described inverting amplifier circuit comprises: the first operational amplifier, and negative input end receives input signal, positive input terminal ground connection, output terminal exports the output signal through amplifying; First resistance R1 and the second resistance R2, the first resistance R1 is connected between the negative input end of the first operational amplifier and forward high-frequency filter circuit, and the second resistance R2 is connected between the first operational amplifier negative input end and output terminal.
5. low-power transistor pin automatic decision circuit as claimed in claim 4, it is characterized in that, the enlargement factor of described inverting amplifier circuit is-R2/R1.
6. low-power transistor pin automatic decision circuit as claimed in claim 5, it is characterized in that, described forward high-frequency filter circuit comprises: the second operational amplifier; 3rd resistance R3 and electric capacity C1, the 3rd resistance R3 and electric capacity C1 is connected between the output terminal of inverting amplifier circuit and the positive input terminal of the second operational amplifier; 4th resistance R4, between the negative input end being connected to the second operational amplifier and output terminal; 5th resistance R5, between the output terminal being connected to the second operational amplifier and inverting amplifier circuit.
7. low-power transistor pin automatic decision circuit as claimed in claim 6, it is characterized in that, the cutoff frequency of described forward high-frequency filter circuit is fc=1/ (2* π * R3*C1).
8. low-power transistor pin automatic decision circuit as claimed in claim 6, it is characterized in that, the resistance of described first resistance R1 is equal with the resistance of the 5th resistance R5; Second resistance R2 is equal with the value of the ratio R4/R3 of the resistance of the 3rd resistance R3 with the 4th resistance R4 with the value of the ratio R2/R1 of the resistance of the first resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410430901.4A CN104297656A (en) | 2014-08-23 | 2014-08-23 | Automatic judgment circuit for pins of low-power triode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410430901.4A CN104297656A (en) | 2014-08-23 | 2014-08-23 | Automatic judgment circuit for pins of low-power triode |
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| CN104297656A true CN104297656A (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410430901.4A Pending CN104297656A (en) | 2014-08-23 | 2014-08-23 | Automatic judgment circuit for pins of low-power triode |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203069744U (en) * | 2013-03-04 | 2013-07-17 | 滁州学院 | Semiconductor triode parameter tester |
| CN103558540A (en) * | 2013-11-07 | 2014-02-05 | 周芸 | General tester for characteristics of diode and audion |
| CN204065341U (en) * | 2014-08-06 | 2014-12-31 | 安徽旭特电子科技有限公司 | A kind of low-power transistor pin automatic decision circuit |
-
2014
- 2014-08-23 CN CN201410430901.4A patent/CN104297656A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203069744U (en) * | 2013-03-04 | 2013-07-17 | 滁州学院 | Semiconductor triode parameter tester |
| CN103558540A (en) * | 2013-11-07 | 2014-02-05 | 周芸 | General tester for characteristics of diode and audion |
| CN204065341U (en) * | 2014-08-06 | 2014-12-31 | 安徽旭特电子科技有限公司 | A kind of low-power transistor pin automatic decision circuit |
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Application publication date: 20150121 |