CN204461754U - A kind of high precision test instrument - Google Patents
A kind of high precision test instrument Download PDFInfo
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- CN204461754U CN204461754U CN201420702008.8U CN201420702008U CN204461754U CN 204461754 U CN204461754 U CN 204461754U CN 201420702008 U CN201420702008 U CN 201420702008U CN 204461754 U CN204461754 U CN 204461754U
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Abstract
The utility model discloses a kind of high precision test instrument, primarily of probe M1, probe M2, the transformer rectifier circuit be connected with the M2 that pops one's head in probe M1, the protection circuit be connected with transformer rectifier circuit, and the driving circuit to be connected with protection circuit forms, and it is characterized in that: be also provided with two-stage low-pass filtering amplifying circuit at driving circuit output terminal; Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT3, triode VT4, positive pole is connected with driving circuit, the electric capacity C7 of minus earth, the resistance R9 that one end is connected with the normal phase input end of amplifier P1, the other end is connected with driving circuit.The utility model adopts two-stage low-pass filtering amplifying circuit, and the Weak fault signal detected by amplification that it can be stable, enables maintenance personal judge vehicle failure from amplified fault-signal accurately, convenient for maintaining.
Description
Technical field
The utility model relates to a kind of detector, specifically refers to a kind of high precision test instrument.
Background technology
Along with the widespread use of electronic technology on automobile, automobile has great improvement in dynamic property, economy, blowdown control and security and comfortableness etc.But due to the electronization that automobile controls, bring increasing difficulty also to the diagnosis and maintenance of vehicle failure, the requirement of people to auto repair technician is also more and more higher.In this case, the application of automotive test equipment brings Gospel for driver and maintenance personal undoubtedly, and it makes the fault diagnosis of automobile more simple and quick with maintenance.
But traditional automotive test equipment is when detecting faint fault-signal, its testing result is inaccurate, thus brings very large difficulty to auto repair work.
Utility model content
The purpose of this utility model is that overcoming current automotive test equipment is detecting when detecting faint fault-signal, and the defect that its testing result is inaccurate, provides the high precision test instrument that a kind of accuracy is high.
The purpose of this utility model is achieved through the following technical solutions: a kind of high precision test instrument, primarily of probe M1, probe M2, the transformer rectifier circuit be connected with the M2 that pops one's head in probe M1, the protection circuit be connected with transformer rectifier circuit, and the driving circuit to be connected with protection circuit forms, and is also provided with two-stage low-pass filtering amplifying circuit at driving circuit output terminal, described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT3, triode VT4, positive pole is connected with driving circuit, the electric capacity C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R9 that the other end is connected with driving circuit, positive pole is connected with amplifier P1 inverting input after resistance R10, the electric capacity C8 that negative pole is connected with the negative pole of electric capacity C7, be serially connected in the electric capacity C9 between the output terminal of amplifier P1 and inverting input, negative pole is connected with the output terminal of amplifier P1, the electric capacity C10 that positive pole is connected with the base stage of triode VT3, one end is connected with the collector of triode VT3, the resistance R11 that the other end is connected with the emitter of triode VT4, positive pole is connected with the base stage of triode VT4 after resistance R12, the electric capacity C11 of ground connection while negative pole is connected with the negative pole of electric capacity C9, one end is connected with the positive pole of electric capacity C11, the resistance R13 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R13, be serially connected in the electric capacity C12 between the output terminal of amplifier P2 and inverting input, and the resistance R15 be serially connected between the normal phase input end of amplifier P2 and output terminal forms, the emitter of described triode VT3 is connected with electric capacity C9 negative pole, and the collector of triode VT4 is connected with the normal phase input end of amplifier P2.
Further, described transformer rectifier circuit is primarily of transformer T1, diode bridge rectifier K, be arranged on the telefault L1 on the former limit of transformer T1, be arranged on the telefault L2 of transformer T1 secondary, positive pole is connected with probe M1, the electric capacity C1 that negative pole is connected with probe M2, one end is connected with the positive pole of electric capacity C1, the other end is in turn through resistance R2, telefault L1 and the fuse FU be connected with the negative pole of electric capacity C1 after resistance R1, and the diode D1 be serially connected between the non-same polarity of telefault L2 and an input end of diode bridge rectifier K forms, the Same Name of Ends of telefault L2 is connected with another input end of diode bridge rectifier K, two output terminals of diode bridge rectifier K are then connected with protection circuit respectively.
Described protection circuit is by the electric capacity C2 be serially connected between diode bridge rectifier K two output terminals, N pole after resistance R3 respectively with the positive pole of electric capacity C2 and driving circuit is connected, P pole is then connected with negative pole and the driving circuit of electric capacity C2 respectively thyristor D2, and the positive pole electric capacity C3 that driving circuit is connected with the N pole of thyristor D2 after resistance R4 with respectively, negative pole is connected with the P pole of thyristor D2 forms; The positive pole of described electric capacity C3 is also connected with driving circuit.
Described driving circuit comprises driving chip U, triode VT1, triode VT2, inductance L 3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R5, resistance R6, resistance R7, resistance R8, and triode D3, one end of inductance L 3 is connected with resistance R3, the other end is connected with the collector of triode VT1, the positive pole of electric capacity C4 is connected with the T pin of driving chip U, negative pole is connected with the negative pole of electric capacity C3, the positive pole of electric capacity C5 is connected with the COMP pin of driving chip U after resistance R5, negative pole is connected with the negative pole of electric capacity C3, the base stage of triode VT1 is connected with the DRV pin of driving chip U, collector is connected with the collector of triode VT2, emitter is connected with the negative pole of electric capacity C5 after resistance R6, the positive pole of electric capacity C6 is connected with the collector of triode VT1, negative pole is connected with the FB pin of driving chip U, the collector of triode VT2 is connected with resistance R9, base stage is connected with the negative pole of electric capacity C6, emitter is connected with the negative pole of electric capacity C5 after resistance R7, the N pole of diode D3 is connected with the collector of triode VT2 after resistance R8, P pole is connected with the negative pole of electric capacity C5 with the positive pole of electric capacity C7 simultaneously, the VDD pin of described driving chip U is connected with the N pole of thyristor D2, EN pin is connected with the positive pole of electric capacity C3, and CS pin is connected with the emitter of triode VT1.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) the utility model adopts two-stage low-pass filtering amplifying circuit, and the Weak fault signal detected by amplification that it can be stable, enables maintenance personal judge vehicle failure from amplified fault-signal accurately, convenient for maintaining.
(2) detector of the present utility model is more energy-conservation.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1; high precision test instrument of the present utility model, primarily of probe M1, probe M2, the transformer rectifier circuit be connected with the M2 that pops one's head in probe M1; the protection circuit be connected with transformer rectifier circuit, and the driving circuit be connected with protection circuit forms.In order to realize the purpose of this utility model, be also provided with two-stage low-pass filtering amplifying circuit at driving circuit output terminal.
Wherein, two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT3, triode VT4, positive pole is connected with driving circuit, the electric capacity C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R9 that the other end is connected with driving circuit, positive pole is connected with amplifier P1 inverting input after resistance R10, the electric capacity C8 that negative pole is connected with the negative pole of electric capacity C7, be serially connected in the electric capacity C9 between the output terminal of amplifier P1 and inverting input, negative pole is connected with the output terminal of amplifier P1, the electric capacity C10 that positive pole is connected with the base stage of triode VT3, one end is connected with the collector of triode VT3, the resistance R11 that the other end is connected with the emitter of triode VT4, positive pole is connected with the base stage of triode VT4 after resistance R12, the electric capacity C11 of ground connection while negative pole is connected with the negative pole of electric capacity C9, one end is connected with the positive pole of electric capacity C11, the resistance R13 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R13, be serially connected in the electric capacity C12 between the output terminal of amplifier P2 and inverting input, and the resistance R15 be serially connected between the normal phase input end of amplifier P2 and output terminal forms, the emitter of described triode VT3 is connected with electric capacity C9 negative pole, and the collector of triode VT4 is connected with the normal phase input end of amplifier P2.This two-stage low-pass filtering amplifying circuit can be stable the Weak fault signal detected by amplification, make its testing result more accurate.
Described transformer rectifier circuit is used for rectification and the transformation of input current, it is by transformer T1, diode bridge rectifier K, be arranged on the telefault L1 on the former limit of transformer T1, be arranged on the telefault L2 of transformer T1 secondary, positive pole is connected with probe M1, the electric capacity C1 that negative pole is connected with probe M2, one end is connected with the positive pole of electric capacity C1, the other end is in turn through resistance R2, telefault L1 and the fuse FU be connected with the negative pole of electric capacity C1 after resistance R1, and the diode D1 be serially connected between the non-same polarity of telefault L2 and an input end of diode bridge rectifier K forms, the Same Name of Ends of telefault L2 is connected with another input end of diode bridge rectifier K, two output terminals of diode bridge rectifier K are then connected with protection circuit respectively.
Described protection circuit is by the electric capacity C2 be serially connected between diode bridge rectifier K two output terminals, N pole after resistance R3 respectively with the positive pole of electric capacity C2 and driving circuit is connected, P pole is then connected with negative pole and the driving circuit of electric capacity C2 respectively thyristor D2, and the positive pole electric capacity C3 that driving circuit is connected with the N pole of thyristor D2 after resistance R4 with respectively, negative pole is connected with the P pole of thyristor D2 forms; The positive pole of described electric capacity C3 is also connected with driving circuit.
Driving circuit comprises driving chip U, triode VT1, triode VT2, inductance L 3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R5, resistance R6, resistance R7, resistance R8, and triode D3, one end of inductance L 3 is connected with resistance R3, the other end is connected with the collector of triode VT1, the positive pole of electric capacity C4 is connected with the T pin of driving chip U, negative pole is connected with the negative pole of electric capacity C3, the positive pole of electric capacity C5 is connected with the COMP pin of driving chip U after resistance R5, negative pole is connected with the negative pole of electric capacity C3, the base stage of triode VT1 is connected with the DRV pin of driving chip U, collector is connected with the collector of triode VT2, emitter is connected with the negative pole of electric capacity C5 after resistance R6, the positive pole of electric capacity C6 is connected with the collector of triode VT1, negative pole is connected with the FB pin of driving chip U, the collector of triode VT2 is connected with resistance R9, base stage is connected with the negative pole of electric capacity C6, emitter is connected with the negative pole of electric capacity C5 after resistance R7, the N pole of diode D3 is connected with the collector of triode VT2 after resistance R8, P pole is connected with the negative pole of electric capacity C5 with the positive pole of electric capacity C7 simultaneously, the VDD pin of described driving chip U is connected with the N pole of thyristor D2, EN pin is connected with the positive pole of electric capacity C3, and CS pin is connected with the emitter of triode VT1.
During operation, probe M1 and probe M2 is for accessing the two ends needing to carry out the auto parts machinery detected, transformer rectifier circuit will detect current value and the magnitude of voltage at its two ends automatically, and carry out rectification through diode bridge rectifier K again after this magnitude of voltage being carried out boosting process, form stable half-wave voltage.The half-wave voltage exported from diode bridge rectifier K output terminal carries out making its magnitude of voltage be input to driving circuit be between 15 ~ 30V after step-down process through protection circuit; finally by two-stage low-pass filtering amplifying circuit amplification detection stable for fault-signal, thus make the testing result of detector more accurate.
As mentioned above, just the utility model can well be realized.
Claims (4)
1. a high precision test instrument, primarily of probe M1, probe M2, the transformer rectifier circuit be connected with the M2 that pops one's head in probe M1, the protection circuit be connected with transformer rectifier circuit, and the driving circuit to be connected with protection circuit forms, and it is characterized in that: be also provided with two-stage low-pass filtering amplifying circuit at driving circuit output terminal, described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT3, triode VT4, positive pole is connected with driving circuit, the electric capacity C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R9 that the other end is connected with driving circuit, positive pole is connected with amplifier P1 inverting input after resistance R10, the electric capacity C8 that negative pole is connected with the negative pole of electric capacity C7, be serially connected in the electric capacity C9 between the output terminal of amplifier P1 and inverting input, negative pole is connected with the output terminal of amplifier P1, the electric capacity C10 that positive pole is connected with the base stage of triode VT3, one end is connected with the collector of triode VT3, the resistance R11 that the other end is connected with the emitter of triode VT4, positive pole is connected with the base stage of triode VT4 after resistance R12, the electric capacity C11 of ground connection while negative pole is connected with the negative pole of electric capacity C9, one end is connected with the positive pole of electric capacity C11, the resistance R13 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R13, be serially connected in the electric capacity C12 between the output terminal of amplifier P2 and inverting input, and the resistance R15 be serially connected between the normal phase input end of amplifier P2 and output terminal forms, the emitter of described triode VT3 is connected with electric capacity C9 negative pole, and the collector of triode VT4 is connected with the normal phase input end of amplifier P2.
2. a kind of high precision test instrument according to claim 1, it is characterized in that: described transformer rectifier circuit is primarily of transformer T1, diode bridge rectifier K, be arranged on the telefault L1 on the former limit of transformer T1, be arranged on the telefault L2 of transformer T1 secondary, positive pole is connected with probe M1, the electric capacity C1 that negative pole is connected with probe M2, one end is connected with the positive pole of electric capacity C1, the other end is in turn through resistance R2, telefault L1 and the fuse FU be connected with the negative pole of electric capacity C1 after resistance R1, and the diode D1 be serially connected between the non-same polarity of telefault L2 and an input end of diode bridge rectifier K forms, the Same Name of Ends of telefault L2 is connected with another input end of diode bridge rectifier K, two output terminals of diode bridge rectifier K are then connected with protection circuit respectively.
3. a kind of high precision test instrument according to claim 2, it is characterized in that: described protection circuit is by the electric capacity C2 be serially connected between diode bridge rectifier K two output terminals, N pole after resistance R3 respectively with the positive pole of electric capacity C2 and driving circuit is connected, P pole is then connected with negative pole and the driving circuit of electric capacity C2 respectively thyristor D2, and the positive pole electric capacity C3 that driving circuit is connected with the N pole of thyristor D2 after resistance R4 with respectively, negative pole is connected with the P pole of thyristor D2 forms; The positive pole of described electric capacity C3 is also connected with driving circuit.
4. a kind of high precision test instrument according to claim 3, is characterized in that: described driving circuit comprises driving chip U, triode VT1, triode VT2, inductance L 3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R5, resistance R6, resistance R7, resistance R8, and triode D3, one end of inductance L 3 is connected with resistance R3, the other end is connected with the collector of triode VT1, the positive pole of electric capacity C4 is connected with the T pin of driving chip U, negative pole is connected with the negative pole of electric capacity C3, the positive pole of electric capacity C5 is connected with the COMP pin of driving chip U after resistance R5, negative pole is connected with the negative pole of electric capacity C3, the base stage of triode VT1 is connected with the DRV pin of driving chip U, collector is connected with the collector of triode VT2, emitter is connected with the negative pole of electric capacity C5 after resistance R6, the positive pole of electric capacity C6 is connected with the collector of triode VT1, negative pole is connected with the FB pin of driving chip U, the collector of triode VT2 is connected with resistance R9, base stage is connected with the negative pole of electric capacity C6, emitter is connected with the negative pole of electric capacity C5 after resistance R7, the N pole of diode D3 is connected with the collector of triode VT2 after resistance R8, P pole is connected with the negative pole of electric capacity C5 with the positive pole of electric capacity C7 simultaneously, the VDD pin of described driving chip U is connected with the N pole of thyristor D2, EN pin is connected with the positive pole of electric capacity C3, and CS pin is connected with the emitter of triode VT1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702008.8U CN204461754U (en) | 2014-11-19 | 2014-11-19 | A kind of high precision test instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702008.8U CN204461754U (en) | 2014-11-19 | 2014-11-19 | A kind of high precision test instrument |
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| Publication Number | Publication Date |
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| CN204461754U true CN204461754U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420702008.8U Expired - Fee Related CN204461754U (en) | 2014-11-19 | 2014-11-19 | A kind of high precision test instrument |
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| CN (1) | CN204461754U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901654A (en) * | 2014-11-19 | 2015-09-09 | 成都冠深科技有限公司 | High-precision energy-saving detector based on pulse amplification trigger circuit |
-
2014
- 2014-11-19 CN CN201420702008.8U patent/CN204461754U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901654A (en) * | 2014-11-19 | 2015-09-09 | 成都冠深科技有限公司 | High-precision energy-saving detector based on pulse amplification trigger circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20161119 |
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| CF01 | Termination of patent right due to non-payment of annual fee |