CN106124793B - Contactless train photoelectric speed sensing device - Google Patents
Contactless train photoelectric speed sensing device Download PDFInfo
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- CN106124793B CN106124793B CN201610421256.9A CN201610421256A CN106124793B CN 106124793 B CN106124793 B CN 106124793B CN 201610421256 A CN201610421256 A CN 201610421256A CN 106124793 B CN106124793 B CN 106124793B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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Abstract
A kind of contactless train photoelectric speed sensing device, including photoimpact generation circuit, positive charge-discharge circuit, reversed charge-discharge circuit, data selector, its working principle is that by output pulse by being used as output pulse all the way in the positive charge-discharge circuit of data selector control gating, reversed charge-discharge circuit, can negative narrow pulse interference during the positive burst pulse and positive broad pulse during the negative broad pulse of automatic fitration, can especially filter continuous key or switch contact shake narrow pulse interference signal；The positive burst pulse maximum width for needing to filter can be adjusted by the outflow driving current size of change forward current driver or the size of positive anti-interference capacitor；The negative burst pulse maximum width for needing to filter can be adjusted by the outflow driving current size of change reverse current driver or the size of reversed anti-interference capacitor.Described device can apply the occasion in train speed detection.
Description
Technical field
The present invention relates to a kind of sensing detection device of rail transit vehicle, especially a kind of contactless train photoelectricity speed
Spend sensing device.
Background technique
In train speed measurement, magnetoelectric speed sensor, magneto velocity sensor are due to its reliability, accuracy etc.
Reason less use, it is currently used there are four types of the light electricity velocity sensor that can be interchanged, it is state-of-the art there are two types of, i.e. TQG9
Type and TQG15 type light electricity velocity sensor.
The generally existing light source of photoelectric sensor is seriously polluted and the big problem of the output waveform distortion factor.Photoelectric sensor
It is to be passed through to become intermittent light with the grating disc that wheel shaft rotates with a light source, due to being universal coupling, this transmission mechanism is direct
With axletree box cavity connection, whole sealing status cannot achieve in structure, the pollution of grating disc can be such that optical signal is distorted, mutually
Pollution generates disturbing pulse.Photoelectric conversion circuit system is by the photodiode on-off operation in light breaker, through circuit
After amplifying shaping, the squared pulse trains proportional to revolving speed are exported.Since train operation generates shake and grating disc, shaft
Machining accuracy cause square-wave pulse to be distorted, after amplifying shaping, the edge of pulse generates shaking interference pulse.
Summary of the invention
In order to solve the problems, such as that existing less photoelectric train speed sensor exists, the present invention provides a kind of contactless trains
Photoelectric speed sensing device, including photoimpact generation circuit, positive charge-discharge circuit, reversed charge-discharge circuit, data selection
Device.
The photoimpact generation circuit output photoelectric pulse.
The input signal of the forward direction charge-discharge circuit and reversed charge-discharge circuit is photoimpact.
The data selector is alternative data selector；Two data input pins of the data selector connect respectively
It is connected to the output end of positive charge-discharge circuit, reversed charge-discharge circuit.
The data output end of the data selector is output pulse ends；The data selector is counted by output pulse
It is controlled according to selection.
The forward direction charge-discharge circuit includes forward current driver, positive anti-interference capacitor, positive anti-interference Schmidt
Circuit；The input terminal of the forward current driver is positive charge-discharge circuit input terminal, and output is connected to positive anti-interference apply
Close spy's circuit input end；One end of the forward direction anti-interference capacitor is connected to positive anti-interference Schmidt circuit input terminal, in addition
One end is connected to the confession of the publicly either positive anti-interference Schmidt circuit of contactless train photoelectric speed sensing device
Power supply.
The reversed charge-discharge circuit includes reverse current driver, reversed anti-interference capacitor, reversed anti-interference Schmidt
Circuit；The input terminal of the reverse current driver is the input terminal of reversed charge-discharge circuit, and output is connected to reversed anti-interference
Schmidt circuit input terminal；One end of the reversed anti-interference capacitor is connected to reversed anti-interference Schmidt circuit input terminal, separately
Outer one end is connected to the publicly either reversed anti-interference Schmidt circuit of contactless train photoelectric speed sensing device
Power supply.
The anti-interference Schmidt circuit output end of forward direction is positive charge-discharge circuit output end, reversed anti-interference Schmidt
Circuit output end is reversed charge-discharge circuit output end.
When the forward current driver input is high level, output end is that electric current drives and flows out driving current；It is described
When the input of forward current driver is low level, output end is that voltage drives and exports low level；The reverse current driver
When input is low level, output end is that electric current drives and flows out driving current；The reverse current driver input is high level
When, output end is that voltage drives and exports low level.
When the forward current driver input is high level, output end is that electric current drives and flows out constant current driving current；
When the reverse current driver input is low level, output end is that electric current drives and flows out constant current driving current.
When being same phase relation between the data selector output signal and positive anti-interference Schmidt circuit input signal,
It is inverted relationship between data selector output signal and reversed anti-interference Schmidt circuit input signal；The data selector
When being inverted relationship between output signal and positive anti-interference Schmidt circuit input signal, data selector output signal and anti-
To being same phase relation between anti-interference Schmidt circuit input signal.
The data selector is by the specific method that output pulse carries out data selection control, when data selector exports
It is same phase relation, data selector output signal and reversed anti-dry between signal and positive anti-interference Schmidt circuit input signal
When disturbing between Schmidt circuit input signal as inverted relationship, the low level control data selector selection for exporting pulse is positive anti-
The output signal of interference Schmidt circuit is sent to the output end of data selector, and it is reversed anti-that high level controls data selector selection
The output signal of interference Schmidt circuit is sent to the output end of data selector；When data selector output signal and forward direction are anti-dry
It disturbs defeated for inverted relationship, data selector output signal and reversed anti-interference Schmidt circuit between Schmidt circuit input signal
Enter between signal when being same phase relation, the low level control data selector for exporting pulse selects reversed anti-interference Schmidt circuit
Output signal be sent to the output end of data selector, high level controls the positive anti-interference Schmidt circuit of data selector selection
Output signal be sent to the output end of data selector.
The positive narrow pulse width that the contactless train photoelectric speed sensing device can filter is filled by changing forward direction
The electric time is controlled；The negative narrow pulse width that the contactless train photoelectric speed sensing device can filter is by changing
Become the reverse charging time to be controlled.
The positive charge time is anti-dry by the outflow driving current size or forward direction that change forward current driver
The size of capacitor is disturbed to be controlled；The reverse charging time is big by the outflow driving current for changing reverse current driver
The size of small or reversed anti-interference capacitor is controlled.
The anti-interference Schmidt circuit of forward direction and reversed anti-interference Schmidt circuit all have high input impedance charcteristic.
The beneficial effects of the present invention are: the contactless train photoelectric speed sensing device allows width to be greater than specified value
Positive pulse and undersuing pass through；Can positive burst pulse during the negative broad pulse of automatic fitration, especially can be quickly extensive
The multiple continuous positive narrow pulse interference signal of filter capacity filtering, eliminates the rising edge shake of photoimpact；The contactless column
Vehicle photoelectric speed sensing device can negative burst pulse during the positive broad pulse of automatic fitration, especially can fast quick-recovery filter energy
Power filters continuous negative narrow pulse interference signal, eliminates the failing edge shake of photoimpact；The positive burst pulse for needing to filter is maximum
Width can be by changing the outflow driving current size of forward current driver or the size progress of positive anti-interference capacitor
Adjustment；The negative burst pulse maximum width for needing to filter can by change reverse current driver outflow driving current size or
The size of the reversed anti-interference capacitor of person is adjusted.
Detailed description of the invention
Fig. 1 is contactless train photoelectric speed sensing device example structure block diagram；
Fig. 2 is pulse filter circuit embodiments；
Fig. 3 is the waveform of pulse filter circuit embodiments；
Fig. 4 is positive current driver and 1 circuit of reverse current driver embodiment；
Fig. 5 is positive current driver and 2 circuit of reverse current driver embodiment；
Fig. 6 is positive current driver and 3 circuit of reverse current driver embodiment.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
It is as shown in Figure 1 contactless train photoelectric speed sensing device example structure block diagram, including photoimpact produces
Raw circuit and pulse filter circuit.The photoimpact P1 that photoimpact generation circuit light electricity velocity sensor generates, photoimpact
P1, which is sent to pulse filter circuit, to carry out pulse and disappears and tremble, and obtains output pulse P2.
Pulse filter circuit includes positive charge-discharge circuit, reversed charge-discharge circuit, data selector.
It is illustrated in figure 2 pulse filter circuit embodiments.In embodiment, forward current driver, positive anti-interference capacitor,
Positive anti-interference Schmidt circuit is respectively current driver U11, capacitor C11, Schmidt circuit F11, constitutes positive charge and discharge
Circuit；Reverse current driver, reversed anti-interference capacitor, reversed anti-interference Schmidt circuit be respectively current driver U21,
Capacitor C21, Schmidt circuit F21, constitute reversed charge-discharge circuit.The input of a termination Schmidt circuit F11 of capacitor C11
End, other end are connected to publicly；The input terminal of a termination Schmidt circuit F21 of capacitor C21, other end are connected to public affairs
Altogether.P1 is photoimpact end, and P2 is output pulse ends.
In embodiment, data selector T11 is alternative data selector, two data input signals and output signal it
Between be all same phase relation, Schmidt circuit F11, Schmidt circuit F21 are then respectively with phase Schmidt circuit and reverse phase Schmidt
Therefore circuit is same phase relation, data selector between data selector T11 output and Schmidt circuit F11 input signal
It is inverted relationship between T11 output and Schmidt circuit F21 input signal.The function of data selector T11 are as follows: when selection controls
When holding A=0, Y=D1 is exported；When selecting control terminal A=1, Y=D2 is exported.Output end Y (the i.e. pulse of data selector T11
Output end P2) it is connected directly to the selection control terminal A of data selector T11, when output pulse P2 is low level, control data choosing
The output signal A3 for selecting device T11 selection Schmidt circuit F11 is sent to the output end Y of data selector；Exporting pulse P2 is high electricity
Usually, the output signal A4 of control data selector T11 selection Schmidt circuit F21 is sent to the output end Y of data selector.
Fig. 3 is the waveform of pulse filter circuit embodiments, including photoimpact P1 and Schmidt circuit F11 exports A3, applies
Close spy circuit F21 output A4, the waveform for exporting pulse P2.In Fig. 2, when photoimpact P1 is maintained low level for a long time, A1
Point is low level, and the output A3 of Schmidt circuit F11 is low level；When photoimpact P1 is maintained high level for a long time, A1
Point is high level, and A3 is high level.When photoimpact P1 becomes low level from high level, the output A1 of current driver U11
It is immediately turned into low level current potential, A3 becomes low level from high level immediately.When photoimpact P1 becomes high level from low level,
A1 current potential rises due to driving current that current driver U11 is exported charges to capacitor C11, when charging between reach T1, A1 is electric
When position rising meets and exceeds the upper limit threshold voltage of Schmidt circuit F11, A3 becomes high level from low level；When the positive arteries and veins of P1
Width is rushed less than T1, the charging time is less than T1, and P1 becomes when A1 current potential is not up to the upper limit threshold voltage of Schmidt circuit F11
Low level, A1 current potential are immediately turned into low level current potential, and A3 maintains low level state.In Fig. 3, the original state of P1 and A3 are low electricity
It is flat.Positive burst pulse 11, positive burst pulse 12, positive burst pulse 13 width be respectively less than T1, A1 current potential can not be charged to or be more than
The upper limit threshold voltage of Schmidt circuit F11, does not influence A3 state；The width of the positive pulse 14 of P1 is greater than T1, therefore,
After the rising edge of the positive pulse 14 of P1 crosses time T1, A3 becomes high level from low level.The failing edge of the positive pulse 14 of P1 makes A3
Become low level from high level, the width of the positive pulse 15 of P1 is greater than T1, and after 15 rising edge of positive pulse crosses time T1, A3 is from low
Level becomes high level.The failing edge of P1 positive pulse 15 makes A3 become low level, positive pulse 16, the positive pulse of P1 from high level
17, the width of positive pulse 18 is respectively less than T1, and therefore, positive pulse 16, positive pulse 17, positive pulse 18 do not influence A3, and A3 is maintained
Low level state.The width of the positive pulse 19 of P1 is greater than T1, and after 19 rising edge of positive pulse crosses time T1, A3 becomes from low level
High level.
In Fig. 2, when photoimpact P1 is maintained low level for a long time, A2 point is high level, and Schmidt circuit F21's is defeated
A4 is low level out；When photoimpact P1 is maintained high level for a long time, A2 point is low level, and A4 is high level.Work as photoelectricity
When pulse P1 becomes high level from low level, the output A2 of current driver U21 is immediately turned into low level current potential, and A4 is immediately from low
Level becomes high level.When photoimpact P1 becomes low level from high level, drive that A2 current potential is exported by current driver U21
Streaming current charges to capacitor C21 and rises, when charging between reach T2, the rising of A2 current potential reaches the upper limit of Schmidt circuit F21
When threshold voltage, A4 becomes low level from high level；When the negative pulse width of P1 is less than T2, the charging time is less than T2, A2 current potential
When not rising the upper limit threshold voltage for reaching Schmidt circuit F21, P1 becomes high level, and A2 is immediately turned into low level current potential,
A4 maintains high level state.In Fig. 3, the original state of P1 and A4 are low level.The rising edge of the positive pulse 11 of P1 makes A4 from low
Level becomes high level, and the width of the negative pulse 20 of P1 is greater than T2, and after 20 failing edge of negative pulse crosses time T2, A4 is from high level
Become low level.The rising edge of the positive pulse 12 of P1 makes A4 become high level from low level, the negative pulse 20 of P1, negative pulse 21
Width is respectively less than T2, and therefore, negative pulse 20, negative pulse 21 do not influence A4, and A4 maintains low level state.Negative pulse 23 is born
Pulse 24, negative pulse 25, negative pulse 26 width be respectively less than T2, A2 current potential can not be charged to or be higher than Schmidt circuit
The upper limit threshold voltage of F21, does not influence A4 state；The width of the negative pulse 27 of P1 is greater than T2, therefore, in the negative pulse of P1
After 27 failing edge crosses time T2, A4 becomes low level from high level.In the rising edge of the negative pulse 27 of P1, A4 becomes from low level
For high level.
The output A3 of Schmidt circuit F11 photoimpact P1 be low level when keep low level, photoimpact P1 by
Time T1 excessively just becomes high level after low level becomes high level.The output A4 of Schmidt circuit F21 is height in photoimpact P1
High level is kept when level, time T2 is crossed after photoimpact P1 becomes low level from high level just becomes low level.In other words,
When A3 is high level, A4 must be high level；When A4 is low level, A3 must be low level.
In Fig. 3, the original state of A3, A4 are low level, and the output Y of data selector T11 is low level, data selection
Device T11 selects A3 as output Y and maintains in A3 for low level period.When A3 becomes high level from low level at edge 30
When, output Y becomes high level, and data selector T11 selects A4 as output Y, and A4 must be high level at this time, maintain output Y
High level state.When A4 is when edge 31 becomes low level from high level, output Y becomes low level, data selector T11 choosing
A3 is selected as output Y, A3 must be low level at this time, maintain the low level state of output Y.When A3 becomes at edge 32 from low level
When for high level, output Y becomes high level, and data selector T11 select A4 as output Y, and A4 must be high level at this time, tie up
Hold the high level state of output Y.
Pulse filter circuit by P1 signal burst pulse 11, burst pulse 12, burst pulse 13, burst pulse 23, burst pulse 24,
Burst pulse 25, burst pulse 26 all filter out, and positive broad pulse 14 (including positive pulse 14, positive pulse 15, positive pulse 16, positive pulse
17 and positive pulse 18, negative pulse 23, negative pulse 24, negative pulse 25, negative pulse 26 are disturbing pulse), negative broad pulse 27 can lead to
It crosses, makes occur corresponding positive broad pulse 28 and negative broad pulse 29 in P2 signal.The same phase of pulse P2 and photoimpact P1 is exported, and it is defeated
Positive broad pulse 14 rising edge lag time T1, failing edge lag time T2 of 28 rising edge of broad pulse out than input.
Positive pulse 11, positive pulse 12, positive pulse 13 are positive burst pulse, and wherein positive pulse 11 is disturbing pulse, positive pulse 12,
Positive pulse 13 is continuous rising edge Vibrating pulse.Time T1 is that the positive burst pulse of maximum that pulse filter circuit can filter is wide
Degree.T1 is the positive charge time.T1 be current driven the outflow driving current size of device U11, current driver U11 it is low
Level potential, capacitor C11 size, Schmidt circuit F11 upper limit threshold voltage joint effect.Under normal conditions, adjust T1's
Value can be carried out by changing outflow driving current size and the capacitor C11 size of current driver U11.
Negative pulse 23, negative pulse 24, negative pulse 25, negative pulse 26, wherein negative pulse 23 be disturbing pulse, negative pulse 24,
Negative pulse 25, negative pulse 26 are continuous failing edge Vibrating pulse.Time T2 is that the maximum that pulse filter circuit can filter is negative
Narrow pulse width.T2 is the reverse charging time.T2 is current driven the outflow driving current size of device U21, electric current driving
The low level current potential of device U21, capacitor C21 size, Schmidt circuit F21 upper limit threshold voltage joint effect.Under normal conditions,
The value for adjusting T2 can be carried out by changing outflow driving current size and the capacitor C21 size of current driver U21.
In Fig. 2, capacitor C11 connects one end publicly can be with reconfiguration in Schmidt circuit F11, Schmidt circuit F21
Power supply end；Similarly, capacitor C21 connect one end publicly can also individually or together with capacitor C11 reconfiguration apply it is close
The power supply end of special circuit F11, Schmidt circuit F21.
In Fig. 2, Schmidt circuit F11, Schmidt circuit F21 can also simultaneously or separately select reverse phase Schmidt electric
Road can also simultaneously or separately be inverted relationship between input D1, D2 and output Y of data selector T11.When Schmidt's electricity
Road F11, Schmidt circuit F21 simultaneously or separately select reverse phase Schmidt circuit, input D1, D2 of data selector T11 with
When being simultaneously or separately inverted relationship between output Y, need to meet following condition, it may be assumed that when data selector T11 exports Y
When being same phase relation between Schmidt circuit F11 forward direction charge-discharge circuit input signal, data selector T11 exports Y and applies
It is inverted relationship between close spy's circuit F21 input signal；The output of the low level control selection Schmidt circuit F11 of Y is sent at this time
Output to the output end of data selector T11, the high level control selections Schmidt circuit F21 of Y is sent to data selector T11
Output end.When it is inverted relationship that data selector T11, which is exported between Y and Schmidt circuit F11 input signal, data selection
It is same phase relation that device T11, which is exported between Y and Schmidt circuit F21 input signal,；Low level control selection Schmidt's electricity of Y at this time
The output of road F21 is sent to the output end of data selector T11, and the output of the high level control selections Schmidt circuit F11 of Y is sent to
The output end of data selector T11.
Fig. 4 is positive current driver and 1 circuit of reverse current driver embodiment.Open-drain output driven in phase device F12,
Resistance R11 forms forward current driver.When P1 is low level, it is low level that driven in phase device F12, which exports A1,；P1 is high level
When, driven in phase device F12 is open-drain output, and power supply+VCC flows out driving current through resistance R11.
Open-drain output rp-drive F22, resistance R21 form reverse current driver.When P1 is high level, reverse phase driving
It is low level that device F22, which exports A2,；When P1 is low level, rp-drive F22 is open-drain output, and power supply+VCC is flowed through resistance R21
Driving current out.
Driven in phase device F12, rp-drive F22 can choose the integrated circuit of various open collectors, open-drain.
Fig. 5 is positive current driver and 2 circuit of reverse current driver embodiment.Triode V21, resistance R22, resistance
R23 forms reverse current driver, and when P1 is high level, triode V21 saturation conduction, it is low that reverse current driver, which exports A2,
Level；When P1 is low level, triode V21 cut-off, power supply+VCC flows out driving current through resistance R22.
Triode V11, triode V12, resistance R12, resistance R13, resistance R14 form forward current driver, and P1 is low
When level, triode V12 cut-off, triode V11 saturation conduction, it is low level that forward current driver, which exports A1,；P1 is high electricity
Usually, triode V12 saturation conduction, triode V11 cut-off, power supply+VCC flow out driving current through resistance R12.Three in Fig. 5
The inverter cricuit of pole pipe V12, resistance R14 composition can also be substituted with other phase inverters.
In Fig. 5, the outflow driving current that forward current driver and reverse current driver provide not is constant size
Driving current.
Fig. 6 is positive current driver and 3 circuit of reverse current driver embodiment.It is triode V25, triode V26, steady
Pressure pipe D25, resistance R25, resistance R26 form reverse current driver, wherein triode V26, voltage-stabiliser tube D25, resistance R25 group
At reversed constant-current circuit.When P1 is high level, triode V25 saturation conduction, it is low level that reverse current driver, which exports A2,；P1
When for low level, triode V25 cut-off, power supply+VCC flows out constant current driving current through triode V26.
Triode V15, triode V16, triode V17, voltage-stabiliser tube D15, resistance R15, resistance R16, resistance R17 composition are just
To current driver, wherein triode V16, voltage-stabiliser tube D15, resistance R15 form positive constant-current circuit.When P1 is low level, three
Pole pipe V17 cut-off, triode V15 saturation conduction, it is low level that forward current driver, which exports A1,；When P1 is high level, three poles
Pipe V17 saturation conduction, triode V15 cut-off, power supply+VCC flow out constant current driving current through triode V16.Triode in Fig. 6
The inverter cricuit of V17, resistance R17 composition can also be substituted with other phase inverters.
The anti-interference Schmidt circuit of the forward direction, reversed anti-interference Schmidt circuit are Schmidt circuit, input signal
For the voltage on capacitor, it is therefore desirable to which Schmidt circuit has high input impedance charcteristic.Schmidt circuit, which can choose, has height
Cmos schmitt phase inverter CD40106,74HC14 of input impedance characteristic, or selection have high input impedance charcteristic
The devices such as cmos schmitt NAND gate CD4093,74HC24.Cmos schmitt phase inverter or cmos schmitt NAND gate it is upper
Limit threshold voltage is fixed value relevant to device.It is constituted with schmitt inverter or Schmidt's NAND gate with phase Schmidt's electricity
Road needs to increase level-one phase inverter behind schmitt inverter or Schmidt's NAND gate.
Schmidt circuit is also an option that using operational amplifier and constitutes, and Schmidt's electricity is constituted using operational amplifier
Road can neatly change upper limit threshold voltage, lower limit threshold voltage.Similarly, Schmidt's electricity is constituted using operational amplifier
Lu Shi is needed using structure and circuit with high input impedance charcteristic.
Data selector can choose the devices such as 74HC151,74HC152,74HC153, CD4512, CD4539 and constitute two choosings
One data selector can also constitute alternative data selector with gate circuit.
The photoimpact high level and low-level load ability of pulse filter circuit requirement photoimpact generation circuit output
Consistent perhaps close and sink current carrying load ability is consistent or close with sourcing current carrying load ability.If photoimpact
Carrying load ability cannot be met the requirements, and be sent again after photoimpact being driven by a driving gate to pulse filter circuit,
Driving gate can choose CMOS gate circuit high-speed cmos gate circuit or selection is constituted with operational amplifier circuit.
Claims (7)
1. a kind of contactless train photoelectric speed sensing device, it is characterised in that:
Including photoimpact generation circuit, positive charge-discharge circuit, reversed charge-discharge circuit, data selector；
The photoimpact generation circuit output photoelectric pulse；
The input signal of the forward direction charge-discharge circuit and reversed charge-discharge circuit is photoimpact；
The data selector is alternative data selector；Two data input pins of the data selector are respectively connected to
The output end of positive charge-discharge circuit, reversed charge-discharge circuit；
The data output end of the data selector is output pulse ends；The data selector carries out data choosing by output pulse
Select control；
The forward direction charge-discharge circuit includes forward current driver, positive anti-interference capacitor, positive anti-interference Schmidt circuit；
The input terminal of the forward current driver is positive charge-discharge circuit input terminal, and output is connected to positive anti-interference Schmidt's electricity
Road input terminal；One end of the forward direction anti-interference capacitor is connected to positive anti-interference Schmidt circuit input terminal, and other end connects
It is connected to the power supply of the publicly either positive anti-interference Schmidt circuit of contactless train photoelectric speed sensing device；
The reversed charge-discharge circuit includes reverse current driver, reversed anti-interference capacitor, reversed anti-interference Schmidt circuit；
The input terminal of the reverse current driver is the input terminal of reversed charge-discharge circuit, and output is connected to reversed anti-interference Schmidt
Circuit input end；One end of the reversed anti-interference capacitor is connected to reversed anti-interference Schmidt circuit input terminal, other end
It is connected to the power supply electricity of the publicly either reversed anti-interference Schmidt circuit of contactless train photoelectric speed sensing device
Source；
The anti-interference Schmidt circuit output end of forward direction is positive charge-discharge circuit output end, reversed anti-interference Schmidt circuit
Output end is reversed charge-discharge circuit output end；
When the forward current driver input is high level, output end is that electric current drives and flows out driving current；The forward direction
When current driver input is low level, output end is that voltage drives and exports low level；The reverse current driver input
When for low level, output end is that electric current drives and flows out driving current；It is defeated when the reverse current driver input is high level
Outlet is that voltage drives and exports low level.
2. contactless train photoelectric speed sensing device according to claim 1, it is characterised in that: the forward current
When driver input is high level, output end is that electric current drives and flows out constant current driving current；The reverse current driver is defeated
When entering for low level, output end is that electric current drives and flows out constant current driving current.
3. contactless train photoelectric speed sensing device according to claim 1, it is characterised in that: the data selection
When being same phase relation between device output signal and positive anti-interference Schmidt circuit input signal, data selector output signal with
It is inverted relationship between reversed anti-interference Schmidt circuit input signal；The data selector output signal and forward direction are anti-interference
When being inverted relationship between Schmidt circuit input signal, data selector output signal and reversed anti-interference Schmidt circuit are defeated
Entering between signal is same phase relation.
4. contactless train photoelectric speed sensing device according to claim 3, it is characterised in that: the data selection
Device by output pulse carry out data selection control specific method be, when data selector output signal with forward direction it is anti-interference apply it is close
It is same phase relation, data selector output signal and reversed anti-interference Schmidt circuit input signal between special circuit input signal
Between when being inverted relationship, export the output of the positive anti-interference Schmidt circuit of low level control data selector selection of pulse
Signal is sent to the output end of data selector, and high level controls the output that data selector selects reversed anti-interference Schmidt circuit
Signal is sent to the output end of data selector；When data selector output signal and positive anti-interference Schmidt circuit input signal
Between be between inverted relationship, data selector output signal and reversed anti-interference Schmidt circuit input signal be same phase relation
When, the low level control data selector for exporting pulse selects the output signal of reversed anti-interference Schmidt circuit to be sent to data choosing
The output end of device is selected, the output signal of the positive anti-interference Schmidt circuit of high level control data selector selection is sent to data choosing
Select the output end of device.
5. contactless train photoelectric speed sensing device described in any one of -4 according to claim 1, it is characterised in that:
The positive narrow pulse width that can be filtered is controlled by changing the positive charge time, and the negative narrow pulse width that can be filtered is logical
The change reverse charging time is spent to be controlled.
6. contactless train photoelectric speed sensing device according to claim 5, it is characterised in that: the positive charge
Time is controlled by the outflow driving current size or the size of forward direction anti-interference capacitor that change forward current driver
System；Outflow driving current size or reversed anti-interference capacitor of the reverse charging time by change reverse current driver
Size controlled.
7. contactless train photoelectric speed sensing device according to claim 5, it is characterised in that: described positive anti-dry
It disturbs Schmidt circuit and reversed anti-interference Schmidt circuit all has high input impedance charcteristic.
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| WO2012135776A1 (en) * | 2011-03-30 | 2012-10-04 | Qualcomm Incorporated | Narrow pulse filter |
| CN102854399A (en) * | 2012-09-07 | 2013-01-02 | 江苏物联网研究发展中心 | Detecting circuit of capacitance type MEMS (micro-electromechanical system) sensor |
| CN104639122A (en) * | 2015-01-28 | 2015-05-20 | 中国兵器工业集团第二一四研究所苏州研发中心 | Zero cross detection circuit for eliminating high frequency burrs |
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| JPH0362613A (en) * | 1989-07-31 | 1991-03-18 | Toshiba Corp | Fault discrimination device for gate control circuit |
| WO2012135776A1 (en) * | 2011-03-30 | 2012-10-04 | Qualcomm Incorporated | Narrow pulse filter |
| CN102854399A (en) * | 2012-09-07 | 2013-01-02 | 江苏物联网研究发展中心 | Detecting circuit of capacitance type MEMS (micro-electromechanical system) sensor |
| CN104639122A (en) * | 2015-01-28 | 2015-05-20 | 中国兵器工业集团第二一四研究所苏州研发中心 | Zero cross detection circuit for eliminating high frequency burrs |
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Effective date of registration: 20191029 Address after: 221300 Jiangsu, Xuzhou, Pizhou high tech Industrial Development Zone West of Taihu Avenue, north of Fu Mei Road. Patentee after: Jiangsu crystal semiconductor Co., Ltd. Address before: 412007 School of industry, research and production, Hunan University of Technology, 88 West Taishan Road, Zhuzhou, Hunan Patentee before: Hunan University of Technology |