CN105869386A - Locomotive speed sensor signal filtering device - Google Patents
Locomotive speed sensor signal filtering device Download PDFInfo
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- CN105869386A CN105869386A CN201610421277.0A CN201610421277A CN105869386A CN 105869386 A CN105869386 A CN 105869386A CN 201610421277 A CN201610421277 A CN 201610421277A CN 105869386 A CN105869386 A CN 105869386A
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- G—PHYSICS
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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Abstract
A locomotive speed sensor signal filtering device comprises an input pulse generating circuit, a quick discharging circuit, a quick charging circuit, a capacitor and a Schmidt circuit. The quick discharging circuit and quick charging circuit are controlled by output pulses of the locomotive speed sensor signal filtering device through an analog switch or a multi-channel analog switch, one way of output pulses is selected to discharge or charge the capacitor, and signals on the capacitor are converted into output pulses through the Schmidt circuit. The locomotive speed sensor signal filtering device can automatically filter positive narrow pulses in a negative narrow pulse period and negative narrow pulse interferences in a positive wide pulse period, especially can filter continuous narrow pulse interference signals, and the maximum widths of the positive narrow pulses and negative narrow pulses needed to be filtered can be respectively adjusted by changing a charging time constant and a discharging time constant. The locomotive speed sensor signal filtering device can be applied to the occasion of locomotive speed detection or traction motor rotation speed detection.
Description
Technical field
The present invention relates to the sensing detection device of a kind of rail transit vehicle, especially a kind of locomotive speed sensor signal filters dress
Put.
Background technology
The conventional method of locomotive traction motor Rotating speed measring is installation measure speed gears on the little gear of traction electric machine, measure speed gears with
Having gap between velocity sensor, when vehicle wheel rotation, photoelectricity, magnetoelectricity, magneto, Hall-type uniform velocity sensor are just producing
Frequency signal than the alternation in wheel velocity.Traction electric machine axle is connected with wheel with gear wheel by little gear, and wheel often rotates
One week, sensor just exported a number of pulse, so the frequency of the alternating signal induced becomes with locomotive traction motor rotating speed
Direct ratio.Due to the impact of the factors such as line conditions, vibration, electromagnetic interference, sensor stationary state, rate signal often presss from both sides
More miscellaneous high-frequency signals, these high-frequency oscillation signals easily make control device the tachometer value of mistake be detected.
Summary of the invention
In order to solve the problem existing for existing locomotive speed sensor signal, the invention provides a kind of locomotive speed sensor letter
Number defecator, including quick discharging circuit, quick-charging circuit, discharge and recharge resistance, electric capacity, Schmidt circuit.
The input of described quick discharging circuit is input pulse, and outfan is connected to Schmidt circuit input；Described quick charge
The input of circuit is input pulse, and outfan is connected to Schmidt circuit input；One end of described electric capacity is connected to Schmidt's electricity
Road input, other end be connected to described device publicly or power supply；The outfan of described Schmidt circuit is
Output pulse ends.
Described quick discharging circuit includes repid discharge diode, repid discharge switch；Described repid discharge diode with quickly put
Electric switch is connected；Described quick-charging circuit includes quick charge diode, fast charge switch；Described quick charge diode
Connect with fast charge switch；One end of described discharge and recharge resistance is input pulse, and other end is connected to Schmidt circuit input
End.
Unidirectional current on described repid discharge diode flows to as to flow to input from quick discharging circuit outfan；Described quickly
Unidirectional current on charging diode flows to as to flow to outfan from quick charge diode input.
Described repid discharge switch, fast charge switch are by exporting Pulse Width Control, and concrete grammar is, when Schmidt circuit is homophase
During Schmidt circuit, the output low level control repid discharge switch connection of pulse, fast charge switch turn off, output pulse
High level controls repid discharge switch OFF, fast charge switch is connected；When Schmidt circuit is anti-phase Schmidt circuit, defeated
The high level going out pulse controls repid discharge switch connection, fast charge switch turns off, and the low level control of output pulse is quickly put
Electric switch turns off, fast charge switch is connected.
Described repid discharge switch and fast charge switch are numerically controlled multiway analog switch.
The positive narrow pulse width that described locomotive speed sensor device signal filtering equipment can filter by change discharge and recharge time constant or
The upper limit threshold voltage of person's Schmidt circuit is controlled, it is possible to the negative narrow pulse width of filtration is normal by changing the discharge and recharge time
The lower limit threshold voltage of number or Schmidt circuit is controlled.Described discharge and recharge time constant is discharge and recharge resistance and electric capacity
Product.
Described Schmidt circuit has high input impedance charcteristic.
The invention has the beneficial effects as follows: described locomotive speed sensor device signal filtering equipment allows the width positive pulse more than setting
Pass through with undersuing, it is possible to the positive burst pulse during broad pulse is born in automatic fitration, particularly can quick-recovery filter capacity soon
Filter continuous print positive narrow pulse interference signal, eliminate the rising edge shake of input pulse；Can be during the positive broad pulse of automatic fitration
Negative burst pulse, particularly can bear narrow pulse interference signal by quick-recovery filter capacity filtration continuous print soon, eliminate under input pulse
Fall is along shake；Need the positive burst pulse Breadth Maximum filtered can be adjusted by changing charge constant；Need filtration
Negative burst pulse Breadth Maximum can be adjusted by changing discharge time constant；Described locomotive speed sensor device signal filtering equipment
Can apply in locomotive speed detection or the occasion of traction electric machine Rotating speed measring.
Accompanying drawing explanation
Fig. 1 is locomotive speed sensor device signal filtering equipment embodiment 1；
Fig. 2 is input pulse and the output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 1；
Fig. 3 is locomotive speed sensor device signal filtering equipment embodiment 2；
Fig. 4 is locomotive speed sensor device signal filtering equipment embodiment 3；
Fig. 5 is input pulse and the output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 3；
Fig. 6 is locomotive speed sensor device signal filtering equipment embodiment 4；
Fig. 7 is locomotive speed sensor device signal filtering equipment embodiment 5；
Fig. 8 is locomotive speed sensor device signal filtering equipment embodiment 6.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
The composition of locomotive speed sensor device signal filtering equipment includes quick discharging circuit, quick-charging circuit, electric capacity, Schmidt
Circuit.
It is illustrated in figure 1 locomotive speed sensor device signal filtering equipment embodiment 1.In embodiment 1, repid discharge diode,
Charging resistor, repid discharge switch are respectively diode D11, resistance R11, switch T11, constitute quick discharging circuit；
Quick charge diode, discharge resistance, fast charge switch are respectively diode D12, resistance R12, switch T12, composition
Quick-charging circuit；Electric capacity is electric capacity C11.Schmidt circuit F11 is homophase Schmidt circuit, exports arteries and veins in embodiment 1
Rush P2 and input pulse P1 homophase.The input of the one termination Schmidt circuit of electric capacity C11, i.e. the input A2 of F11,
Other end is connected to publicly.The anode of diode D11 is connected to the input A2 of F11, and negative electrode is connected with switch T11
After be connected to input pulse end P1, when switching T11 conducting, the unidirectional current of diode D11 flows to as from the input of F11
End A2 flows to input pulse end P1.The negative electrode of diode D12 is connected to the input A2 of F11, anode and switch T12 string
Being connected to input pulse end P1 after connection, when switching T12 conducting, the unidirectional current of diode D12 flows to as from input pulse
End P1 flows to the input A2 of F11.
Repid discharge switch, fast charge switch are the bilateral analog switch of Automatic level control.In embodiment 1, switch T11, open
Closing switch connection when T12 all selects control signal to be high level, when control signal is low level, the bidirectional analog of switch OFF is opened
Closing, model can select CD4066, or CD4016.In embodiment 1, Schmidt circuit F11 is homophase Schmidt electricity
Road, output pulse P2 (A3 point in Fig. 1) be connected directly to switch T12 Automatic level control end, output pulse P2 height,
Low level controls to switch T12 respectively and connects, turns off；Pulse P2 is after phase inverter F12 (in Fig. 1 in outputPoint) even
Being connected to switch the Automatic level control end of T11, the high and low level of output pulse P2 controls to switch T11 respectively and turns off, connects.It is subject to
To output pulse P2 control, switch T11 with switch T12 in always one in an ON state, another one is off
State.
Fig. 2 is input pulse and the output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 1.In Fig. 2, P1
For input pulse, P2 is output pulse, when P1 low level is normal negative broad pulse, A2 point current potential and A1 in Fig. 1
Point low level current potential is consistent, and P2 is low level, and switch T11 connects, T12 turns off.The high level of positive burst pulse 11 is by filling
Electric capacity C11 is charged by electricity resistance R11, makes A2 point current potential increase；Owing to the width of burst pulse 11 is less than time T1, A2
Point current potential is still below the upper limit threshold voltage of Schmidt circuit F11 at the end of burst pulse 11, and therefore, P2 is maintained low electricity
Flat, switch T11 maintains and connects；At the end of burst pulse 11, A1 point becomes low level and again by repid discharge diode
D11 makes electric capacity C11 repid discharge, makes A2 point current potential consistent with A1 point low level current potential, before recovering to arrive to burst pulse 11
State, its capacity of resisting disturbance is recovered rapidly, when followed by when having continuous print positive narrow pulse interference signal, equally can
Filter out.Positive burst pulse 12, the width of positive burst pulse 13 are respectively less than time T1, therefore, when burst pulse 12, burst pulse 13
In each at the end of, P2 is maintained low level, and A1 point is again become low level and made by repid discharge diode D11
Electric capacity C11 repid discharge, makes A2 point current potential consistent with A1 point low level current potential.
Pulse 14 is normal positive broad pulse, when P1 maintains high level time to reach T1 after rising edge 20, the height of P1
Electric capacity C11 is charged by level by charging resistor R11, makes A2 point current potential rise the upper limit threshold reaching Schmidt circuit F11
Voltage, Schmidt circuit F11 output P2 becomes high level from low level at rising edge 25, makes switch T11 shutoff, T12
Connect；The high level of A1 point makes electric capacity C11 quick charge by quick charge diode D12, makes A2 point current potential and A1
Point high level current potential is consistent, and P2 is maintained high level.
Electric capacity C11 is discharged by the low level of negative burst pulse 15 by discharge resistance R12, makes A2 point current potential decline；Due to narrow
The width of pulse 15 remains above the lower limit door of Schmidt circuit F11 less than time T2, A2 point current potential at the end of burst pulse 15
Sill voltage, therefore, P2 is maintained high level, and switch T12 maintains and connects；At the end of burst pulse 15, A1 point becomes again
High level and make electric capacity C11 quick charge by quick charge diode D12, makes A2 point current potential and A1 point high level current potential
Unanimously, recovering the state before arriving to burst pulse 15, its capacity of resisting disturbance is recovered rapidly, when followed by there being continuous print
During negative narrow pulse interference signal, can filter out equally.Negative burst pulse 16, negative burst pulse 17, negative burst pulse 18 width equal
Less than time T2, therefore, at the end of each in burst pulse 16, burst pulse 17, burst pulse 18, P2 is maintained high
Level, A1 point again becomes high level and makes electric capacity C11 quick charge by quick charge diode D12, makes A2 point electricity
Position is consistent with A1 point high level current potential.
When P1 maintains low level time to reach T2 after trailing edge 21, represent that P1 has a broad pulse the most negative, P1
Low level by discharge resistance R12, electric capacity C11 is discharged, make the decline of A2 point current potential reach the lower limit of Schmidt circuit F11
Threshold voltage, Schmidt circuit F11 output P2 becomes low level from high level at trailing edge 26, makes switch T11 connect
Logical, T12 turns off；The low level of A1 point makes electric capacity C11 repid discharge by repid discharge diode D11, makes A2 point electricity
Position is consistent with A1 point low level current potential, and P2 is maintained low level.Negative broad pulse 19 width of P1 is more than T2, at negative wide arteries and veins
When maintaining high level time to reach T1 after the rising edge 22 of punching 19, P2 becomes high electricity from low level at rising edge 27
Flat.
Locomotive speed sensor device signal filtering equipment is by the burst pulse 11 in input pulse signal P1, burst pulse 12, burst pulse
13, burst pulse 15, burst pulse 16, burst pulse 17, burst pulse 18 all filter out, and positive broad pulse 14, negative broad pulse 19
Can pass through, make that P2 signal occurs corresponding positive broad pulse 23 and negative broad pulse 24.Output pulse P2 and input pulse
P1 homophase, and broad pulse 23 rising edge exported is than broad pulse 14 rising edge T1 lag time of input, when trailing edge is delayed
Between T2.
Burst pulse 11, burst pulse 12, burst pulse 13 are positive burst pulse, and wherein burst pulse 11 is disturbing pulse, burst pulse
12, burst pulse 13 is continuous print rising edge Vibrating pulse.Time T1 is that locomotive speed sensor device signal filtering equipment can filter
Maximum positive narrow pulse width.T1 is by charge constant, the high level current potential of input pulse P1, input pulse P1
The upper limit threshold voltage joint effect of low level current potential and Schmidt circuit F11.Under normal circumstances, the high electricity of input pulse P1
Ordinary telegram position and low level current potential are definite value, and therefore, the value adjusting T1 can be by changing charge constant or Schmidt's electricity
The upper limit threshold voltage on road is carried out.In Fig. 1, charge constant is the product of charging resistor R11 and electric capacity C11.
Burst pulse 15, burst pulse 16, burst pulse 17, burst pulse 18 are negative burst pulse, and wherein burst pulse 15 is interference arteries and veins
Punching, burst pulse 16, burst pulse 17, burst pulse 18 are continuous print trailing edge Vibrating pulse.Time T2 is locomotive speed sensing
The maximum that device device signal filtering equipment can filter bears narrow pulse width.T2 is by discharge time constant, the high electricity of input pulse P1
The lower limit threshold voltage joint effect of ordinary telegram position, the low level current potential of input pulse P1 and Schmidt circuit F11.Normal conditions
Under, the high level current potential of input pulse P1 and low level current potential are definite value, and therefore, the value adjusting T2 can be put by change
The lower limit threshold voltage of electrical time constant or Schmidt circuit is carried out.In Fig. 1, discharge time constant is discharge resistance R12
Product with electric capacity C11.
In Fig. 1, diode D11 connects with switch T11 with after resistance R11 parallel connection again, and input pulse P1 is from the first warp of A1 point
The parallel circuit arrival A2 point cross and switch T11, being then passed through diode D11 and resistance R11, flows to close according to pulse signal
System, repid discharge switch is connected in series in before the parallel circuit of repid discharge diode and charging resistor；Diode D12
Connecting with switch T12 with after resistance R12 parallel connection again, flow to relation according to pulse signal, fast charge switch is connected in series in
Before the parallel circuit of quick charge diode and discharge resistance.The series position of repid discharge switch can also be placed on quickly to be put
After the parallel circuit of electric diode and charging resistor, similarly, the series position of fast charge switch can also be placed on quickly
After the parallel circuit of charging diode and discharge resistance.Can also exist by reconfiguration it addition, electric capacity C11 connects one end publicly
The power supply end of locomotive speed sensor device signal filtering equipment.
In Fig. 1, Schmidt circuit F11 can also select anti-phase Schmidt circuit, now output pulse P2 and input pulse P1
Anti-phase, output pulse P2 and inversion signal thereof control switch T11, the connected mode of switch T12 needs according to output pulse P2
High and low level respectively control switch T12 turn off, connect, output pulse P2 high and low level respectively control switch T11
Connect, shutoff is carried out.
Fig. 3 show locomotive speed sensor device signal filtering equipment embodiment 2, repid discharge diode, charging resistor, quickly
Discharge switch is respectively diode D21, resistance R21, switch T21, quick charge diode, discharge resistance, quick charge
Switch is respectively diode D22, resistance R22, switch T22, and electric capacity is electric capacity C21.Schmidt circuit F21 is that homophase is executed
Close special circuit, output pulse P2 (B3 point in Fig. 3) is connected directly to switch the Automatic level control end of T22；Output pulse P2
After phase inverter F22 (in Fig. 3Point) it is connected to switch the Automatic level control end of T21.Shown in embodiment 2 and Fig. 1
Embodiment 1 structure is similar to, and difference one is the input of a termination Schmidt circuit of electric capacity C21, and other end connects
To the power supply+VCC of locomotive speed sensor device signal filtering equipment, difference two is to flow to relation according to pulse signal,
The series position of repid discharge switch is after the parallel circuit of repid discharge diode and charging resistor, i.e. switch T21 connects
After diode D21 with resistance R21 parallel circuit.The operation principle of embodiment 2 is same as in Example 1.
Being illustrated in figure 4 locomotive speed sensor device signal filtering equipment embodiment 3, repid discharge diode, charging resistor are respectively
For diode D31, resistance R31, quick charge diode, discharge resistance are respectively diode D32, resistance R32, quickly
Discharge switch and fast charge switch are numerically controlled multiway analog switch T31, and the normal open switch of T31 is that repid discharge is opened
Closing, normally closed switch is fast charge switch；Diode D31, resistance R31 and the normal open switch of multiway analog switch T31
(C1 in Fig. 4) forms the normally closed switch of quick discharging circuit, diode D32, resistance R32 and multiway analog switch T31
(C0 in Fig. 4) forms quick-charging circuit；Electric capacity is electric capacity C31, the input of a termination Schmidt circuit of electric capacity C31
End, i.e. the input C2 of F31, other end is connected to publicly.Schmidt circuit F31 is anti-phase Schmidt circuit,
The high level seeking output pulse P2 controls repid discharge switch connection, fast charge switch turns off, low level control repid discharge
Switch OFF, fast charge switch are connected；In Fig. 4, output pulse P2 (C3 point in Fig. 4) is connected directly to multi-channel analog
The digital control end of switch T31, the high level of output pulse P2 controls the normal open switch of multiway analog switch T31 and connects, often
Closing switch OFF, i.e. the high level of output pulse P2 controls repid discharge switch connection, fast charge switch turns off；Output arteries and veins
The normal open switch of the low level control multiway analog switch T31 rushing P2 turns off, normally closed switch is connected, i.e. output pulse P2's
Low level control repid discharge switch OFF, fast charge switch are connected.
Numerically controlled multiway analog switch can select the device of the different models such as CD4051, CD4052, CD4053.Real
Executing in example 3, T31 selects numerically controlled 2 tunnels analogy switch CD4053.
Fig. 5 is input pulse and the output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 3.In Fig. 5, P1
For input pulse, P2 is output pulse, when P1 low level is normal negative broad pulse, C2 point current potential and pulse in Fig. 4
Input C4 point low level current potential is consistent, and P2 is high level, and T31 normal open switch is connected, normally closed switch turns off.Positive burst pulse
Electric capacity C31 is charged by the high level of 31 by charging resistor R31, makes C2 point current potential increase；Width due to burst pulse 31
At the end of burst pulse 31, the upper limit threshold voltage of Schmidt circuit F31 it is still below less than time T1, C2 point current potential, because of
This, P2 is maintained high level, and T31 state maintains；Burst pulse 31 terminates, and C4 point becomes low level and again by quickly putting
Electric diode D31 makes electric capacity C31 repid discharge, makes C2 point current potential consistent with C4 point low level current potential, recovers to burst pulse
State before 31 arrivings, its capacity of resisting disturbance is recovered rapidly, when followed by there being continuous print positive narrow pulse interference signal
Time, can filter out equally.Positive burst pulse 32, the width of positive burst pulse 33 are respectively less than time T1, therefore, work as burst pulse
32, at the end of each in burst pulse 33, P2 is maintained high level, and C4 point becomes low level and again by quickly putting
Electric diode D31 makes electric capacity C31 repid discharge, makes C2 point current potential consistent with C4 point low level current potential.
Pulse 34 is normal positive broad pulse, when P1 maintains high level time to reach T1 after rising edge 40, the height of P1
Electric capacity C31 is charged by level by charging resistor R31, makes C2 point current potential rise the upper limit threshold reaching Schmidt circuit F31
Voltage, Schmidt circuit F31 output P2 becomes low level from high level at trailing edge 45, makes T31 normal open switch close
Disconnected, normally closed switch is connected；The high level of C4 point makes electric capacity C31 quick charge by quick charge diode D32, makes C2
Point current potential is consistent with C4 point high level current potential, and P2 is maintained low level.
Electric capacity C31 is discharged by the low level of negative burst pulse 35 by discharge resistance R32, makes C2 point current potential decline；Due to narrow
The width of pulse 35 remains above the lower limit door of Schmidt circuit F31 less than time T2, C2 point current potential at the end of burst pulse 35
Sill voltage, therefore, P2 is maintained low level, and T31 state maintains；Burst pulse 35 terminates, C4 point again become high level and
Make electric capacity C31 quick charge by quick charge diode D32, make C2 point current potential consistent with C4 point high level current potential, extensive
Multiple state to burst pulse 31 arriving, its capacity of resisting disturbance is recovered rapidly, when followed by there being continuous print to bear burst pulse
During interference signal, can filter out equally.Negative burst pulse 36, negative burst pulse 37, the width of negative burst pulse 38 are respectively less than the time
T2, therefore, at the end of each in burst pulse 36, burst pulse 37, burst pulse 38, P2 is maintained low level, C4
Point again becomes high level and makes electric capacity C31 quick charge by quick charge diode D32, makes C2 point current potential and C4 point
High level current potential is consistent.
When P1 maintains low level time to reach T2 after trailing edge 41, represent that P1 has a broad pulse the most negative, P1
Low level by discharge resistance R32, electric capacity C31 is discharged, make the decline of C2 point current potential reach the lower limit of Schmidt circuit F31
Threshold voltage, Schmidt circuit F31 output P2 becomes high level from low level at rising edge 46, makes T31 normal open switch
Connect, normally closed switch turns off；The low level of C4 point makes electric capacity C31 repid discharge by repid discharge diode D31, makes
C2 point current potential is consistent with C4 point low level current potential, and P2 is maintained high level.Negative broad pulse 39 width of P1 is more than T2,
When maintaining high level time to reach T1 after the rising edge 42 of negative broad pulse 39, P2 becomes from high level at trailing edge 47
Low level.
Locomotive speed sensor device signal filtering equipment is by the burst pulse 31 in P1 signal, burst pulse 32, burst pulse 33, narrow arteries and veins
Punching 35, burst pulse 36, burst pulse 37, burst pulse 38 all filter out, and positive broad pulse 34, negative broad pulse 39 can be led to
Cross, make that P2 signal occurs the corresponding and negative broad pulse 43 anti-phase with P1 and positive broad pulse 44.Burst pulse 31, narrow arteries and veins
Punching 32, burst pulse 33 are positive burst pulse, and wherein burst pulse 31 is disturbing pulse, and burst pulse 32, burst pulse 33 are continuous print
Edge trembling pulse.Burst pulse 35, burst pulse 36, burst pulse 37, burst pulse 38 are negative burst pulse, wherein burst pulse 35
For disturbing pulse, burst pulse 36, burst pulse 37, burst pulse 38 are continuous print edge trembling pulse.
In Fig. 5, time T1 is the maximum positive burst pulse width of the input that locomotive speed sensor device signal filtering equipment can filter
Degree, the value adjusting T1 can be carried out by changing the upper limit threshold voltage of charge constant or Schmidt circuit.Fig. 4
In, charge constant is the product of charging resistor R31 and electric capacity C31.Time T2 is that locomotive speed sensor signal filters
The maximum of the input that device can filter bears narrow pulse width.The value adjusting T2 by changing discharge time constant or can be executed
The lower limit threshold voltage of close special circuit is carried out.In Fig. 4, discharge time constant is taking advantage of of discharge resistance R32 and electric capacity C31
Long-pending.
In Fig. 4, multiway analog switch T31 uses allotter connection, digital signal C3 control input pulse P1 and divide
It is assigned to quick discharging circuit or quick-charging circuit；Multiway analog switch T31 can also use selector connection, i.e. inputs
Pulse P1 delivers to quick discharging circuit and quick-charging circuit simultaneously, by Digital Signals select quick discharging circuit or
The signal of quick-charging circuit is connected to Schmidt circuit.
In Fig. 4, electric capacity C31 connect one end publicly can also reconfiguration in the power supply of locomotive speed sensor device signal filtering equipment
Power end.
In Fig. 4, Schmidt circuit F31 can also select homophase Schmidt circuit.
Fig. 6 show locomotive speed sensor device signal filtering equipment embodiment 4, and repid discharge diode, charging resistor are respectively
Diode D41, resistance R41, quick charge diode, discharge resistance are respectively diode D42, resistance R42, quickly put
Electric switch and fast charge switch are numerically controlled multiway analog switch T41；Electric capacity is electric capacity C41, one end of electric capacity C41
Meeting the input D2 of the input of Schmidt circuit, i.e. F41, other end is connected to publicly.Embodiment 4 and embodiment
The structure of 3 is similar to, and difference is that one is that multiway analog switch T41 have employed selector connection, selector connection and distribution
It is different what device connection do not has from operation principle；Two be Schmidt circuit F41 be homophase Schmidt circuit, export pulse P2
With input pulse P1 homophase, output pulse P2 (D3 point in Fig. 6) is connected directly to the numeral control of multiway analog switch T41
End processed, so the normally closed switch of T41 is repid discharge switch, normal open switch is fast charge switch；Diode D41, resistance
Normally closed switch (D0 in Fig. 6) the composition quick discharging circuit of R41 and multiway analog switch T41, diode D42, resistance
Normal open switch (D1 in Fig. 6) the composition quick-charging circuit of R42 and multiway analog switch T41.
Fig. 7 show locomotive speed sensor device signal filtering equipment embodiment 5.In embodiment 5, repid discharge diode, fast
Speed discharge switch is respectively diode D51, switch T51, constitutes quick discharging circuit；Quick charge diode, quickly fill
Electric switch is respectively diode D52, switch T52, constitutes quick-charging circuit；Electric capacity is electric capacity C51；Schmidt circuit
F51 is anti-phase Schmidt circuit, therefore, exports pulse P2 anti-phase with input pulse P1, export pulse P2 in embodiment 5
(E3 point in Fig. 7) is connected directly to switch the Automatic level control end of T51；Output pulse P2 (Fig. 7 after phase inverter F52
InPoint) it is connected to switch the Automatic level control end of T52.
In embodiment 5, taken with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance respectively
Disappear, replaced by the discharge and recharge resistance R51 being connected in parallel on input pulse end E1 and Schmidt circuit input E2.This circuit is
The special case that charging resistor is identical with discharge resistance, can simplify circuit structure.
Fig. 8 show locomotive speed sensor device signal filtering equipment embodiment 6.In embodiment 6, repid discharge diode is two
Pole pipe D61, quick charge diode is diode D62, and repid discharge switch and fast charge switch are numerically controlled multichannel
Analog switch T61；Electric capacity is electric capacity C61, the input of a termination Schmidt circuit of electric capacity C61, i.e. the input of F61
F2, other end is connected to publicly；Multiway analog switch T61 uses allotter connection.Schmidt circuit F61 is homophase
Schmidt circuit, output pulse P2 and input pulse P1 homophase, output pulse P2 (F3 point in Fig. 8) is directly connected at most
The digital control end of path analoging switch T61, so the normally closed switch of T61 is repid discharge switch, normal open switch is for quickly to fill
Electric switch；Normally closed switch (F0 in Fig. 8) the composition quick discharging circuit of diode D61 and multiway analog switch T41, two
Normal open switch (F1 in Fig. 8) the composition quick-charging circuit of pole pipe D62 and multiway analog switch T61.
In embodiment 6, taken with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance respectively
Disappear, replaced by the discharge and recharge resistance R61 being connected in parallel on input pulse end F4 and Schmidt circuit input F2.This circuit is also
For the special case that charging resistor is identical with discharge resistance, circuit structure can be simplified.
The input signal of described Schmidt circuit is the voltage on electric capacity, it is therefore desirable to Schmidt circuit has high input impedance spy
Property.Schmidt circuit can select cmos schmitt phase inverter CD40106, the 74HC14 with high input impedance charcteristic,
Or select that there is the devices such as cmos schmitt NAND gate CD4093 of high input impedance charcteristic, 74HC24.CMOS
The upper limit threshold voltage of schmitt inverter or cmos schmitt NAND gate, lower limit threshold voltage are relevant to device
Fixed value, therefore, adjusts the positive narrow pulse width of the input that can filter, negative narrow pulse width needs by changing the charging interval
Constant, discharge time constant are carried out.Constitute homophase Schmidt circuit by schmitt inverter or Schmidt's NAND gate, need
One-level phase inverter is increased after schmitt inverter or Schmidt's NAND gate.
Schmidt circuit can also select to use operational amplifier to constitute, and uses operational amplifier to constitute Schmidt circuit permissible
Change upper limit threshold voltage, lower limit threshold voltage neatly.Similarly, when using operational amplifier to constitute Schmidt circuit,
Need to use structure and the circuit with high input impedance charcteristic.
Claims (7)
1. a locomotive speed sensor device signal filtering equipment, it is characterised in that:
Including quick discharging circuit, quick-charging circuit, discharge and recharge resistance, electric capacity, Schmidt circuit；
The input of described quick discharging circuit is input pulse, and outfan is connected to Schmidt circuit input；
The input of described quick-charging circuit is input pulse, and outfan is connected to Schmidt circuit input；
One end of described electric capacity is connected to Schmidt circuit input, other end be connected to described device publicly or power supply electricity
Source；
The outfan of described Schmidt circuit is output pulse ends.
Locomotive speed sensor device signal filtering equipment the most according to claim 1, it is characterised in that: described quick discharging circuit
Including repid discharge diode, repid discharge switch；Described repid discharge diode is connected with repid discharge switch；Described quickly
Charging circuit includes quick charge diode, fast charge switch；Described quick charge diode is connected with fast charge switch；
The unidirectional current of described repid discharge diode flows to as to flow to input from quick discharging circuit outfan；Described quick charge two
The unidirectional current of pole pipe flows to as to flow to outfan from quick charge diode input；
One end of described discharge and recharge resistance is input pulse, and other end is connected to Schmidt circuit input；
Described repid discharge switch, fast charge switch are by exporting Pulse Width Control.
Locomotive speed sensor device signal filtering equipment the most according to claim 2, it is characterised in that: described repid discharge is opened
Close, fast charge switch by exporting pulse controlled concrete grammar is, when Schmidt circuit is homophase Schmidt circuit, and output
The low level control repid discharge switch connection of pulse, fast charge switch turn off, and the high level of output pulse controls repid discharge
Switch OFF, fast charge switch are connected；When Schmidt circuit is anti-phase Schmidt circuit, the high level of output pulse controls
Repid discharge switch connection, fast charge switch turn off, and export the low level control repid discharge switch OFF of pulse, quickly fill
Electric switch is connected.
Locomotive speed sensor device signal filtering equipment the most according to claim 2, it is characterised in that: described repid discharge switchs
It is numerically controlled multiway analog switch with fast charge switch.
5. according to the locomotive speed sensor device signal filtering equipment according to any one of claim 2-4, it is characterised in that: can mistake
The positive narrow pulse width of filter is controlled by changing the upper limit threshold voltage of discharge and recharge time constant or Schmidt circuit, energy
Enough negative narrow pulse widths filtered are controlled by changing the lower limit threshold voltage of discharge and recharge time constant or Schmidt circuit
System.
Locomotive speed sensor device signal filtering equipment the most according to claim 5, it is characterised in that: the described discharge and recharge time is normal
Number is the product of discharge and recharge resistance with electric capacity.
Locomotive speed sensor device signal filtering equipment the most according to claim 5, it is characterised in that: described Schmidt circuit has
There is high input impedance charcteristic.
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| CN201610421277.0A CN105869386B (en) | 2016-06-15 | 2016-06-15 | Locomotive speed sensor device signal filtering equipment |
| CN201910178705.5A CN109727447B (en) | 2016-06-15 | 2016-06-15 | Locomotive speed detection signal filtering method |
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| CN201610421277.0A CN105869386B (en) | 2016-06-15 | 2016-06-15 | Locomotive speed sensor device signal filtering equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109727447B (en) | 2021-09-07 |
| CN109727447A (en) | 2019-05-07 |
| CN105869386B (en) | 2019-05-24 |
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