CN205898884U - Self -correcting zero signal machine current test circuit - Google Patents
Self -correcting zero signal machine current test circuit Download PDFInfo
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- CN205898884U CN205898884U CN201620913034.4U CN201620913034U CN205898884U CN 205898884 U CN205898884 U CN 205898884U CN 201620913034 U CN201620913034 U CN 201620913034U CN 205898884 U CN205898884 U CN 205898884U
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Abstract
The utility model relates to a self -correcting zero signal machine current test circuit contains single -chip control circuit, subtraction circuit, sensor follower circuit, PWM modulate circuit, and single -chip control circuit is used for controlling entire system work, and subtraction circuit is used for calibrating the output error of sensor, and sensor follower circuit is used for to the sample voltage of subtraction circuit output sensor, and the PWM modulate circuit is used for the PWM ripples of plastic single -chip control circuit output to export subtraction circuit. The utility model discloses test circuit adopts the isolation mode to gather, does not influence equipment normal use, can automatic school zero, can monitor the operating condition of on -the -spot semaphore and the record.
Description
Technical field
This utility model is related to technical field of rail traffic and in particular to a kind of self-correcting zero-signal machine current testing circuit.
Background technology
Semaphore is one of signal of interest equipment of rail traffic vehicles section, and semaphore constitutes letter with track switch, track circuit
Number outdoor three-major-items, its reliability is directly connected to operational efficiency and traffic safety, and equally, semaphore is as important interlocking bar
One of part, for ensureing safety.In signalling arrangement fault, signal trouble accounts for sizable proportion, common fault bag
Include: signal serial number dodges, semaphore head dodges, semaphore ash is aobvious etc., can be by outdoor letter be tentatively judged to the monitoring of electric current
The performance of number machine and state, are not yet monitored to semaphore electric current at present.
Content of the invention
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provides a kind of semaphore electric current to survey
Examination circuit, can automatic zero adjustment, the working condition of on-site signal machine can be monitored and record.
For solving above technical problem, a kind of technical scheme that this utility model is taken is:
A kind of self-correcting zero-signal machine current testing circuit, including
Single chip machine controlling circuit, controls whole system work；
Subtraction circuit, is connected with single chip machine controlling circuit, and result is simultaneously exported by the output error for calibration sensor
To single chip machine controlling circuit；
Pwm modulate circuit, is connected with single chip machine controlling circuit and subtraction circuit, defeated for shaping single chip machine controlling circuit
The pwm ripple that goes out simultaneously exports subtraction circuit；
Sensor follow circuit, is connected with subtraction circuit, for the sampled voltage to subtraction circuit output transducer.
Preferably, the sensor that sensor follow circuit includes being sequentially connected, sensor output resistance and first follow electricity
Road.
It is further preferred that subtraction circuit includes inverting input resistance and in-phase input end resistance, inverting input electricity
Resistance is connected with the outfan of pwm modulate circuit, and in-phase input end resistance is connected with the first follow circuit.
It is further preferred that pwm modulate circuit includes low-pass filter circuit and the second follow circuit, low-pass filter circuit by
One resistance and an electric capacity composition, the second follow circuit of rear class is connected with the inverting input resistance of subtraction circuit.
Due to the employing of above technical scheme, this utility model compared with prior art has the advantage that
This utility model semaphore current testing circuit is acquired using isolation method, and the equipment that do not affect normally uses,
Can automatic zero adjustment, the working condition of on-site signal machine can be monitored and record.
Brief description
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is circuit diagram of the present utility model.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, this utility model is described in further details.
As shown in Figure 1, a kind of self-correcting of this utility model zero-signal machine current testing circuit, including
Single chip machine controlling circuit, controls whole system work；
Subtraction circuit, is connected with single chip machine controlling circuit, and result is simultaneously exported by the output error for calibration sensor
To single chip machine controlling circuit；
Pwm modulate circuit, is connected with single chip machine controlling circuit and subtraction circuit, defeated for shaping single chip machine controlling circuit
The pwm ripple that goes out simultaneously exports subtraction circuit；
Sensor follow circuit, is connected with subtraction circuit, for the sampled voltage to subtraction circuit output transducer.
In the present embodiment, sensor follow circuit includes sensor, the sensor output resistance and first being sequentially connected
Follow circuit, subtraction circuit includes inverting input resistance and in-phase input end resistance, inverting input resistance and pwm conditioning electricity
The outfan on road is connected, and in-phase input end resistance is connected with the first follow circuit, and pwm modulate circuit includes low-pass filtering electricity
Road and the second follow circuit, low-pass filter circuit is made up of a resistance and an electric capacity, the second follow circuit of rear class with subtract
The inverting input resistance of method circuit is connected
It is circuit diagram of the present utility model as shown in Figure 2, wherein u5 is the core monolithic of single chip machine controlling circuit
Machine, type selecting is stc12c5a60s2, and its peripheral circuit includes reset circuit and clock circuit, and reset circuit includes electric capacity c3 and electricity
Resistance r6, clock circuit then comprises y1 and c1, c2.Subtraction circuit is mainly made up of amplifier u1, and type selecting is op07, and its effect is to use
Pwm modulate circuit output voltage and sensor follow circuit voltage subtract each other, and reach the purpose of automatic zero adjustment, the electricity obtaining after subtracting each other
Pressure, through amplifying output to single-chip microcomputer sampling, so increases the fluctuating margin of sensor output signal, facilitates single-chip microcomputer ad to sample,
The inverting input resistance r4 of u1 is connected with pwm modulate circuit outfan, and electricity followed by in-phase input end resistance r3 and sensor
Road is connected, and the amplification of circuit is determined by the value of r4/r3, is approximately 3 times, before and after the u3 follow circuit of rear class is used for mating
The input and output impedance of level.Sensor follow circuit comprises the output resistance r5 of sensor u4, sensor, and defeated with sensor
Go out the follow circuit u6 that resistance r5 is connected, Choice of Sensors is hbc06lsp, and sensor is based on hall principle, using semaphore
Wire is sampled by perforation means, and the output voltage obtained by r5 is upper carries out impedance matching through the follow circuit u6 of rear class
Deliver to afterwards on the homophase input resistance r3 of subtraction circuit.Pwm modulate circuit comprises low-pass filter circuit and follow circuit, low pass
Filter circuit is used for for square wave being shaped to unidirectional current, is made up of a resistance r7 and an electric capacity c4, the follow circuit u2 of rear class
Then it is used for being connected with the anti-phase input resistance r4 of subtraction circuit.Before each sampling, in order to reduce interference and the circuit at scene
On error, single-chip microcomputer all export a pwm ripple go offset single-chip microcomputer 1 foot on voltage because the output to subtraction circuit for 1 foot
End carries out ad sampling, and when sampled result is more than 0, single-chip microcomputer then constantly changes pwm dutycycle, to reduce the electricity of the 1 foot upper deviation
Pressure value, until sampled result is 0, stops school zero, to increase the precision of sampling with this, improves resolution and the correctness of sampling.
Above this utility model is described in detail, the explanation of embodiment is only intended to help and understands this utility model
Method and its core concept, its object is to allow the personage being familiar with this art will appreciate that content of the present utility model simultaneously
Implement according to this, protection domain of the present utility model can not be limited with this.All according to this utility model spirit made etc.
Effect change or modification, all should cover within protection domain of the present utility model.
Claims (4)
1. a kind of self-correcting zero-signal machine current testing circuit it is characterised in that: include
Single chip machine controlling circuit, controls whole system work；
Subtraction circuit, is connected with described single chip machine controlling circuit, and result is simultaneously exported by the output error for calibration sensor
To described single chip machine controlling circuit；
Pwm modulate circuit, is connected with described single chip machine controlling circuit and described subtraction circuit, for single-chip microcomputer control described in shaping
The pwm ripple of circuit output processed simultaneously exports described subtraction circuit；
Sensor follow circuit, is connected with described subtraction circuit, for the sampling electricity to described subtraction circuit output transducer
Pressure.
2. self-correcting zero-signal machine current testing circuit according to claim 1 it is characterised in that: electricity followed by described sensor
Road includes sensor, sensor output resistance and the first follow circuit being sequentially connected.
3. self-correcting zero-signal machine current testing circuit according to claim 2 it is characterised in that: described subtraction circuit includes
Inverting input resistance and in-phase input end resistance, the outfan phase of described inverting input resistance and described pwm modulate circuit
Connect, described in-phase input end resistance is connected with described first follow circuit.
4. self-correcting zero-signal machine current testing circuit according to claim 3 it is characterised in that: described pwm modulate circuit
Including low-pass filter circuit and the second follow circuit, described low-pass filter circuit is made up of a resistance and an electric capacity, rear class
Described second follow circuit be connected with the inverting input resistance of described subtraction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913034.4U CN205898884U (en) | 2016-08-19 | 2016-08-19 | Self -correcting zero signal machine current test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913034.4U CN205898884U (en) | 2016-08-19 | 2016-08-19 | Self -correcting zero signal machine current test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205898884U true CN205898884U (en) | 2017-01-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620913034.4U Expired - Fee Related CN205898884U (en) | 2016-08-19 | 2016-08-19 | Self -correcting zero signal machine current test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205898884U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110085046A (en) * | 2019-05-22 | 2019-08-02 | 无锡安邦电气股份有限公司 | The signal lamp failure detection circuit and detection method that signal lamp is combined with signal controlling machine |
-
2016
- 2016-08-19 CN CN201620913034.4U patent/CN205898884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110085046A (en) * | 2019-05-22 | 2019-08-02 | 无锡安邦电气股份有限公司 | The signal lamp failure detection circuit and detection method that signal lamp is combined with signal controlling machine |
| CN110085046B (en) * | 2019-05-22 | 2023-12-26 | 无锡安邦电气股份有限公司 | Signal lamp fault detection circuit and method combining signal lamp and signal controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170118 Termination date: 20170819 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |