CN105869386B - Locomotive speed sensor device signal filtering equipment - Google Patents
Locomotive speed sensor device signal filtering equipment Download PDFInfo
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- CN105869386B CN105869386B CN201610421277.0A CN201610421277A CN105869386B CN 105869386 B CN105869386 B CN 105869386B CN 201610421277 A CN201610421277 A CN 201610421277A CN 105869386 B CN105869386 B CN 105869386B
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
Abstract
A kind of locomotive speed sensor device signal filtering equipment, including input pulse generation circuit, quick discharging circuit, quick-charging circuit, capacitor, Schmidt circuit.The output pulse of locomotive speed sensor device signal filtering equipment controls quick discharging circuit and quick-charging circuit by analog switch or multiway analog switch, wherein a routing input pulse is discharged or is charged to capacitor for selection, and the signal on capacitor obtains output pulse through Schmidt circuit.The locomotive speed sensor device signal filtering equipment 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 narrow pulse interference signal；The maximum width of the positive burst pulse and negative burst pulse that need to filter can be adjusted by changing charge constant and discharge time constant respectively.Described device can apply the occasion in locomotive speed detection or traction electric machine Rotating speed measring.
Description
Technical field
The present invention relates to a kind of sensing detection device of rail transit vehicle, especially a kind of locomotive speed sensor signal
Filter device.
Background technique
The common method of locomotive traction motor Rotating speed measring is to install measure speed gears in traction electric machine pinion gear, is tested the speed
There is gap between gear and velocity sensor, when vehicle wheel rotation, photoelectricity, magnetoelectricity, magneto, Hall-type uniform velocity sensor are produced
The frequency signal of the raw alternation for being proportional to wheel velocity.Traction electric machine axis is connected by pinion gear and gear wheel with wheel, wheel
It often rotates a circle, sensor just exports a certain number of pulses, so the frequency of the alternating signal induced and locomotive traction electricity
Machine revolving speed is directly proportional.Due to the influence of the factors such as line conditions, vibration, electromagnetic interference, sensor stationary state, in speed signal
Often it is mingled with some high-frequency signals, these high-frequency oscillation signals are easy the tachometer value for making control device detect mistake.
Summary of the invention
In order to solve the problems of existing locomotive speed sensor signal, the present invention provides a kind of locomotive speed biographies
Sensor signal filter device, including quick discharging circuit, quick-charging circuit, charge and discharge resistance, capacitor, Schmidt circuit.
The input of the quick discharging circuit is input pulse, and output end is connected to Schmidt circuit input terminal；It is described fast
The input of fast charging circuit is input pulse, and output end is connected to Schmidt circuit input terminal；One end of the capacitor is connected to
Schmidt circuit input terminal, other end be connected to described device publicly either power supply；The Schmidt circuit
Output end be output pulse ends.
The quick discharging circuit includes repid discharge diode, repid discharge switch；The repid discharge diode with
Repid discharge switch series connection；The quick-charging circuit includes quick charge diode, fast charge switch；The quick charge
Diode is connected with fast charge switch；One end of the charge and discharge resistance is input pulse, and other end is connected to Schmidt
Circuit input end.
Unidirectional current flow direction on the repid discharge diode is to flow to input terminal from quick discharging circuit output end；Institute
The unidirectional current flow direction on quick charge diode is stated to flow to output end from quick charge diode input terminal.
The repid discharge switch, fast charge switch are by output pulse control, and specific method is, when Schmidt circuit is
When with phase Schmidt circuit, low level control repid discharge switch connection, the fast charge switch shutdown of pulse are exported, arteries and veins is exported
High level control repid discharge switch OFF, the fast charge switch of punching are connected；When Schmidt circuit is reverse phase Schmidt circuit
When, high level control repid discharge switch connection, the fast charge switch shutdown of pulse are exported, the low level control of pulse is exported
Repid discharge switch OFF, fast charge switch are connected.
The repid discharge switch and fast charge switch are numerically controlled multiway analog switch.
When the positive narrow pulse width that the locomotive speed sensor device signal filtering equipment can filter is by changing charge and discharge
Between the upper limit threshold voltage of constant or Schmidt circuit controlled, the negative narrow pulse width that can filter is filled by changing
The lower limit threshold voltage of discharge time constant or Schmidt circuit is controlled.The charge and discharge electrical time constant is charge and discharge
The product of resistance and capacitor.
The Schmidt circuit has high input impedance charcteristic.
The beneficial effects of the present invention are: the locomotive speed sensor device signal filtering equipment 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 being capable of fast quick-recovery
The continuous positive narrow pulse interference signal of filter capacity filtering, eliminates the rising edge shake of input pulse；Can automatic fitration it is just wide
Negative burst pulse during pulse especially quick-recovery filter capacity can filter continuous negative narrow pulse interference signal fastly, eliminate
The failing edge of input pulse is shaken；The positive burst pulse maximum width for needing to filter can be adjusted by changing charge constant
It is whole；The negative burst pulse maximum width for needing to filter can be adjusted by changing discharge time constant；The locomotive speed passes
Sensor signal filter device can apply the occasion in locomotive speed detection or traction electric machine Rotating speed measring.
Detailed description of the invention
Fig. 1 is locomotive speed sensor device signal filtering equipment embodiment 1；
Fig. 2 is the input pulse and 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 the input pulse and 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.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
The composition of locomotive speed sensor device signal filtering equipment includes quick discharging circuit, quick-charging circuit, capacitor, applies
Close spy's circuit.
It is as shown in Figure 1 locomotive speed sensor device signal filtering equipment embodiment 1.In embodiment 1, two pole of repid discharge
Pipe, charging resistor, repid discharge switch are respectively diode D11, resistance R11, switch T11, constitute quick discharging circuit；Fastly
Fast charging diode, discharge resistance, fast charge switch are respectively diode D12, resistance R12, switch T12, are constituted quickly
Charging circuit；Capacitor is capacitor C11.Schmidt circuit F11 be with phase Schmidt circuit, in embodiment 1 output pulse P2 with it is defeated
Enter the same phase of pulse P1.The input terminal of a termination Schmidt circuit of capacitor C11, i.e. the input terminal A2 of F11, other end are connected to
Publicly.The anode of diode D11 is connected to the input terminal A2 of F11, and cathode is connected to input pulse end after connecting with switch T11
P1, when switch T11 conducting, the unidirectional current flow direction of diode D11 is to flow to input pulse end P1 from the input terminal A2 of F11.
The cathode of diode D12 is connected to the input terminal A2 of F11, and anode is connected to input pulse end P1 after connecting with switch T12, when opening
When closing T12 conducting, the unidirectional current flow direction of diode D12 is the input terminal A2 that F11 is flowed to from input pulse end P1.
Repid discharge switch, the bilateral analog switch that fast charge switch is level control.In embodiment 1, switch T11,
Switch T12 selects control signal switch connection when being high level, the bidirectional analog of switch OFF when controlling signal as low level
Switch, model can choose CD4066 or CD4016.In embodiment 1 Schmidt circuit F11 be with phase Schmidt circuit,
Output pulse P2 (A3 point in Fig. 1) is connected directly to the level control terminal of switch T12, the high and low level difference of output pulse P2
Control switch T12 is connected, is turned off；Output pulse P2 is after phase inverter F12 (in Fig. 1Point) it is connected to the level of switch T11
Control terminal, the high and low level difference control switch T11 shutdown of output pulse P2 are connected.By the control of output pulse P2, open
Close in T11 and switch T12 always one in an ON state, another is in an off state.
Fig. 2 is the input pulse and output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 1.In Fig. 2,
P1 is input pulse, and P2 is output pulse, and when P1 low level is normal negative broad pulse, A2 point current potential is low with A1 point in Fig. 1
Level potential is consistent, and P2 is low level, and switch T11 is connected, T12 is turned off.The high level of positive burst pulse 11 passes through charging resistor R11
It charges to capacitor C11, increase A2 point current potential；Since the width of burst pulse 11 is less than time T1, A2 point current potential is in burst pulse 11
At the end of be still below the upper limit threshold voltage of Schmidt circuit F11, therefore, P2 is maintained low level, and switch T11 maintains to connect；
At the end of burst pulse 11, A1 point becomes low level again and makes capacitor C11 repid discharge by repid discharge diode D11, makes
A2 point current potential is consistent with A1 point low level current potential, restores to burst pulse 11 state before arriving, and anti-interference ability obtains rapidly
Restore, when followed by there is continuous positive narrow pulse interference signal, can equally filter out.Positive burst pulse 12, positive burst pulse
13 width is respectively less than time T1, and therefore, at the end of each of burst pulse 12, burst pulse 13, P2 is maintained low level,
A1 point becomes low level again and makes capacitor C11 repid discharge by repid discharge diode D11, keeps A2 point current potential low with A1 point
Level potential is consistent.
Pulse 14 is normal positive broad pulse, and P1 after rising edge 20 when maintaining high level time to reach T1, the height of P1
Level charges to capacitor C11 by charging resistor R11, and A2 point current potential is made to rise the upper limit threshold electricity for reaching Schmidt circuit F11
Pressure, Schmidt circuit F11 output P2 become high level from low level at rising edge 25, connect switch T11 shutdown, T12；A1
The high level of point makes capacitor C11 quick charge by quick charge diode D12, makes A2 point current potential and A1 point high level current potential one
It causes, P2 is maintained high level.
The low level of negative burst pulse 15 discharges to capacitor C11 by discharge resistance R12, declines A2 point current potential；Due to narrow
The width of pulse 15 is less than time T2, and A2 point current potential is still higher than the lower limit threshold of Schmidt circuit F11 at the end of burst pulse 15
Voltage, therefore, P2 are maintained high level, and switch T12 maintains to connect；At the end of burst pulse 15, A1 point become again high level and
Make capacitor C11 quick charge by quick charge diode D12, keep A2 point current potential consistent with A1 point high level current potential, restores extremely
Burst pulse 15 arrive before state, anti-interference ability restored rapidly, when followed by there is continuous negative narrow pulse interference
When signal, can equally it filter out.Negative burst pulse 16, negative burst pulse 17, negative burst pulse 18 width be respectively less than time T2, because
This, at the end of each of burst pulse 16, burst pulse 17, burst pulse 18, P2 is maintained high level, and A1 point becomes high again
Level and capacitor C11 quick charge is made by quick charge diode D12, keeps A2 point current potential consistent with A1 point high level current potential.
P1 indicates that P1 has a normal negative broad pulse, P1 when maintaining low level time to reach T2 after failing edge 21
Low level discharged by discharge resistance R12 capacitor C11, so that the decline of A2 point current potential is reached the lower limit door of Schmidt circuit F11
Sill voltage, Schmidt circuit F11 output P2 become low level from high level at failing edge 26, connect switch T11, T12 is closed
It is disconnected；The low level of A1 point makes capacitor C11 repid discharge by repid discharge diode D11, makes A2 point current potential and A1 point low level
Current potential is consistent, and P2 is maintained low level.19 width of negative broad pulse of P1 is greater than T2, ties up after the rising edge 22 of negative broad pulse 19
When holding high level time and reaching T1, P2 becomes high level from low level at rising edge 27.
Locomotive speed sensor device signal filtering equipment is by the burst pulse 11 in input pulse signal P1, burst pulse 12, narrow arteries and veins
Punching 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, makes occur corresponding positive broad pulse 23 and negative broad pulse 24 in P2 signal.The same phase of pulse P2 and input pulse P1 is exported, and
Broad pulse 14 rising edge lag time T1, failing edge lag time T2 of 23 rising edge of broad pulse of output than input.
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 rising edge Vibrating pulse.Time T1 is that locomotive speed sensor device signal filtering equipment can filter most
Big positive narrow pulse width.T1 is electric by the low level of charge constant, the high level current potential of input pulse P1, input pulse P1
The upper limit threshold voltage joint effect of position and Schmidt circuit F11.Under normal conditions, the high level current potential of input pulse P1 and low
Level potential is definite value, and therefore, the value for adjusting T1 can be by change charge constant or the upper limit door of Schmidt circuit
Sill voltage carries out.In Fig. 1, charge constant is the product of charging resistor R11 and capacitor C11.
Burst pulse 15, burst pulse 16, burst pulse 17, burst pulse 18 are negative burst pulse, and wherein burst pulse 15 is disturbing pulse,
Burst pulse 16, burst pulse 17, burst pulse 18 are continuous failing edge Vibrating pulse.Time T2 is locomotive speed sensor signal mistake
The negative narrow pulse width of maximum that filter device can filter.T2 is by discharge time constant, the high level current potential, defeated of input pulse P1
Enter the low level current potential of pulse P1 and the lower limit threshold voltage joint effect of Schmidt circuit F11.Under normal conditions, input pulse
The high level current potential and low level current potential of P1 be definite value, therefore, adjust T2 value can by change discharge time constant or
The lower limit threshold voltage of Schmidt circuit carries out.In Fig. 1, discharge time constant is multiplying for discharge resistance R12 and capacitor C11
Product.
In Fig. 1, connect again with switch T11 after diode D11 is in parallel with resistance R11, input pulse P1 is first passed through from A1 point
Switch T11, the parallel circuit for then passing through diode D11 and resistance R11 reach A2 point, flow to relationship according to pulse signal, fastly
Fast discharge switch is connected in series in front of repid discharge diode and the parallel circuit of charging resistor；Diode D12 and resistance
It connects again with switch T12 after R12 is in parallel, flows to relationship according to pulse signal, fast charge switch is connected in series in quick charge
Before the parallel circuit of diode and discharge resistance.The series position of repid discharge switch can also be placed on two pole of repid discharge
Pipe is with behind the parallel circuit of charging resistor, and similarly, the series position of fast charge switch can also be placed on quick charge
Behind the parallel circuit of diode and discharge resistance.In addition, capacitor C11 connect one end publicly can also with reconfiguration locomotive speed
Spend the power supply end of sensing device signal filtering equipment.
In Fig. 1, Schmidt circuit F11 also can choose reverse phase Schmidt circuit, export pulse P2 and input pulse at this time
P1 reverse phase exports pulse P2 and its inversion signal control switch T11, the connection type of switch T12 is needed according to output pulse P2
High and low level difference control switch T12 shutdown, connect, output pulse P2 high and low level difference control switch T11 connect,
It turns off to carry out.
Fig. 3 show locomotive speed sensor device signal filtering equipment embodiment 2, repid discharge diode, charging resistor, fast
Fast discharge switch is respectively diode D21, resistance R21, switch T21, and quick charge diode, discharge resistance, quick charge are opened
Closing is respectively diode D22, resistance R22, switch T22, and capacitor is capacitor C21.Schmidt circuit F21 is with phase Schmidt's electricity
Road, output pulse P2 (B3 point in Fig. 3) are connected directly to the level control terminal of switch T22；It exports pulse P2 and passes through phase inverter F22
Afterwards (in Fig. 3Point) it is connected to the level control terminal of switch T21.Embodiment 2 is similar with 1 structure of embodiment shown in FIG. 1, no
With place first is that the input terminal of a termination Schmidt circuit of capacitor C21, other end are connected to locomotive speed sensor signal
Power supply+the VCC of filter device, difference is second is that flow to relationship, the series connection position of repid discharge switch according to pulse signal
It sets behind repid discharge diode and the parallel circuit of charging resistor, i.e., switch T21 is connected on diode D21 and resistance
Behind R21 parallel circuit.The working principle of embodiment 2 is same as Example 1.
It is illustrated in figure 4 locomotive speed sensor device signal filtering equipment embodiment 3, repid discharge diode, charging resistor
Respectively diode D31, resistance R31, quick charge diode, discharge resistance are respectively diode D32, resistance R32, are quickly put
Electric switch and fast charge switch are numerically controlled multiway analog switch T31, and the normal open switch of T31 is repid discharge switch,
Normally closed switch is fast charge switch；The normal open switch (C1 in Fig. 4) of diode D31, resistance R31 and multiway analog switch T31
Quick discharging circuit is formed, diode D32, resistance R32 and normally closed switch (C0 in Fig. 4) composition of multiway analog switch T31 are fast
Fast charging circuit；Capacitor be capacitor C31, capacitor C31 one termination Schmidt circuit input terminal, i.e. the input terminal C2 of F31, separately
Outer one end is connected to publicly.Schmidt circuit F31 is reverse phase Schmidt circuit, it is desirable that the high level control of output pulse P2 is fast
Fast discharge switch is connected, fast charge switch turns off, and 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 the digital control end of multiway analog switch T31, output pulse P2's
The normal open switch that high level controls multiway analog switch T31 is connected, normally closed switch turns off, i.e. the high level control of output pulse P2
Repid discharge switch connection, fast charge switch shutdown；Export the normally opened of the low level control multiway analog switch T31 of pulse P2
Switch OFF, normally closed switch are connected, i.e. low level control repid discharge switch OFF, the fast charge switch of output pulse P2 connects
It is logical.
Numerically controlled multiway analog switch can choose the device of the different models such as CD4051, CD4052, CD4053.It is real
It applies in example 3, T31 selects numerically controlled 2 channel analogy switch CD4053.
Fig. 5 is the input pulse and output pulse waveform of locomotive speed sensor device signal filtering equipment embodiment 3.In Fig. 5,
P1 is input pulse, and P2 is output pulse, and when P1 low level is normal negative broad pulse, C2 point current potential and pulse are defeated in Fig. 4
Enter to hold C4 point low level current potential consistent, P2 is high level, and T31 normal open switch is connected, normally closed switch turns off.The height of positive burst pulse 31
Level charges to capacitor C31 by charging resistor R31, increase C2 point current potential；Since the width of burst pulse 31 is less than time T1,
C2 point current potential is still below the upper limit threshold voltage of Schmidt circuit F31 at the end of burst pulse 31, and therefore, P2 is maintained high electricity
Flat, T31 state maintains；Burst pulse 31 terminates, and C4 point becomes low level again and makes capacitor by repid discharge diode D31
C31 repid discharge keeps C2 point current potential consistent with C4 point low level current potential, restores to burst pulse 31 state before arriving, and resists dry
It disturbs ability to be restored rapidly, when followed by there is continuous positive narrow pulse interference signal, can equally filter out.Just narrow arteries and veins
The width for rushing 32, positive burst pulse 33 is respectively less than time T1, therefore, at the end of each of burst pulse 32, burst pulse 33, P2
It is maintained high level, C4 point becomes low level again and makes capacitor C31 repid discharge by repid discharge diode D31, makes C2
Point current potential is consistent with C4 point low level current potential.
Pulse 34 is normal positive broad pulse, and P1 after rising edge 40 when maintaining high level time to reach T1, the height of P1
Level charges to capacitor C31 by charging resistor R31, and C2 point current potential is made to rise the upper limit threshold electricity for reaching Schmidt circuit F31
Pressure, Schmidt circuit F31 output P2 become low level from high level at failing edge 45, make the shutdown of T31 normal open switch, normally closed open
It closes and connects；The high level of C4 point makes capacitor C31 quick charge by quick charge diode D32, keeps C2 point current potential and C4 point high
Level potential is consistent, and P2 is maintained low level.
The low level of negative burst pulse 35 discharges to capacitor C31 by discharge resistance R32, declines C2 point current potential；Due to narrow
The width of pulse 35 is less than time T2, and C2 point current potential is still higher than the lower limit threshold of Schmidt circuit F31 at the end of burst pulse 35
Voltage, therefore, P2 are maintained low level, and T31 state maintains；Burst pulse 35 terminates, and C4 point becomes high level and again by fast
Fast charging diode D32 makes capacitor C31 quick charge, keeps C2 point current potential consistent with C4 point high level current potential, restores to burst pulse
State before 31 arrivings, anti-interference ability are restored rapidly, when followed by there is continuous negative narrow pulse interference signal,
It can equally filter out.Negative burst pulse 36, negative burst pulse 37, negative burst pulse 38 width be respectively less than time T2, therefore, when narrow arteries and veins
At the end of each of punching 36, burst pulse 37, burst pulse 38, P2 is maintained low level, and C4 point becomes high level again and leads to
Crossing quick charging diode D32 makes capacitor C31 quick charge, keeps C2 point current potential consistent with C4 point high level current potential.
P1 indicates that P1 has a normal negative broad pulse, P1 when maintaining low level time to reach T2 after failing edge 41
Low level discharged by discharge resistance R32 capacitor C31, so that the decline of C2 point current potential is reached the lower limit door of Schmidt circuit F31
Sill voltage, Schmidt circuit F31 output P2 become high level from low level at rising edge 46, connect T31 normal open switch, often
Close switch OFF；The low level of C4 point makes capacitor C31 repid discharge by repid discharge diode D31, makes C2 point current potential and C4
Point low level current potential is consistent, and P2 is maintained high level.39 width of negative broad pulse of P1 is greater than T2, in the rising edge of negative broad pulse 39
When maintaining high level time to reach T1 after 42, P2 becomes low level from high level at failing edge 47.
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 pass through, and make P2
Occur in signal it is corresponding and with the negative broad pulse 43 of P1 reverse phase and positive broad pulse 44.Burst pulse 31, burst pulse 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 edge trembling pulse.It is narrow
Pulse 35, burst pulse 36, burst pulse 37, burst pulse 38 are negative burst pulse, and wherein burst pulse 35 is disturbing pulse, burst pulse 36,
Burst pulse 37, burst pulse 38 are continuous edge trembling pulse.
In Fig. 5, time T1 is the positive burst pulse of maximum for the input that locomotive speed sensor device signal filtering equipment can filter
Width, the value for 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 capacitor C31.Time T2 is locomotive speed sensor signal filtering dress
Set the negative narrow pulse width of maximum for the input that can be filtered.The value for adjusting T2 can be by changing discharge time constant or applying close
The lower limit threshold voltage of special circuit carries out.In Fig. 4, discharge time constant is the product of discharge resistance R32 and capacitor C31.
In Fig. 4, multiway analog switch T31 is using distributor connection, by input pulse P1 points of digital signal C3 control
It is assigned to quick discharging circuit either quick-charging circuit；Multiway analog switch T31 can also use selector connection, that is, input
Pulse P1 is sent to quick discharging circuit and quick-charging circuit simultaneously, either by Digital Signals selection quick discharging circuit
The signal of quick-charging circuit is connected to Schmidt circuit.
In Fig. 4, capacitor C31 connect one end publicly can also with reconfiguration locomotive speed sensor device signal filtering equipment confession
Electric power end.
In Fig. 4, Schmidt circuit F31 also can choose same phase Schmidt circuit.
Fig. 6 show locomotive speed sensor device signal filtering equipment embodiment 4, repid discharge diode, charging resistor point
Not Wei diode D41, resistance R41, quick charge diode, discharge resistance are respectively diode D42, resistance R42, repid discharge
Switch is numerically controlled multiway analog switch T41 with fast charge switch；Capacitor is capacitor C41, and a termination of capacitor C41 is applied
The input terminal of close spy's circuit, i.e. the input terminal D2 of F41, other end are connected to publicly.The structure of embodiment 4 and embodiment 3
It is similar, the difference is that first is that multiway analog switch T41 uses selector connection, selector connection and distributor connection from
There is no any difference in working principle；Second is that Schmidt circuit F41 is to export pulse P2 and input pulse with phase Schmidt circuit
The same phase of P1, output pulse P2 (D3 point in Fig. 6) is connected directly to the digital control end of multiway analog switch T41, so T41's is normal
It is that repid discharge switchs that make and break, which is closed, and normal open switch is fast charge switch；Diode D41, resistance R41 and multiway analog switch
The normally closed switch (D0 in Fig. 6) of T41 forms quick discharging circuit, and diode D42, resistance R42 are normal with multiway analog switch T41's
It switchs (D1 in Fig. 6) and forms quick-charging circuit.
Fig. 7 show locomotive speed sensor device signal filtering equipment embodiment 5.In embodiment 5, repid discharge diode,
Repid discharge switch is respectively diode D51, switch T51, constitutes quick discharging circuit；Quick charge diode quickly fills
Electric switch is respectively diode D52, switch T52, constitutes quick-charging circuit；Capacitor is capacitor C51；Schmidt circuit F51
For reverse phase Schmidt circuit, therefore, pulse P2 and input pulse P1 reverse phase are exported in embodiment 5, output pulse P2 (E3 in Fig. 7
Point) it is connected directly to the level control terminal of switch T51；Output pulse P2 is after phase inverter F52 (in Fig. 7Point) it is connected to
The level control terminal of switch T52.
In embodiment 5, respectively with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance
It is cancelled, is replaced by the charge and discharge resistance R51 for being connected in parallel on input pulse end E1 and Schmidt circuit input terminal E2.This circuit is
Charging resistor special case 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
Diode D61, quick charge diode are diode D62, and repid discharge switch and fast charge switch are numerically controlled more
Path analoging switch T61；Capacitor is capacitor C61, the input terminal of a termination Schmidt circuit of capacitor C61, the i.e. input terminal of F61
F2, other end are connected to publicly；Multiway analog switch T61 uses distributor connection.Schmidt circuit F61 is with phase Shi Mi
Special circuit, exports the same phase of pulse P2 and input pulse P1, and output pulse P2 (F3 point in Fig. 8) is connected directly to multiway analog switch
The digital control end of T61, so the normally closed switch of T61 is repid discharge switch, normal open switch is fast charge switch；Diode
The normally closed switch (F0 in Fig. 8) of D61 and multiway analog switch T41 forms quick discharging circuit, and diode D62 is opened with multi-channel analog
The normal open switch (F1 in Fig. 8) for closing T61 forms quick-charging circuit.
In embodiment 6, respectively with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance
It is cancelled, is replaced by the charge and discharge resistance R61 for being connected in parallel on input pulse end F4 and Schmidt circuit input terminal F2.This circuit
For charging resistor special case identical with discharge resistance, circuit structure can simplify.
The input signal of the Schmidt circuit is the voltage on capacitor, it is therefore desirable to which Schmidt circuit has high input
Impedance operator.Schmidt circuit can choose cmos schmitt phase inverter CD40106 with high input impedance charcteristic,
74HC14, or selection have the devices such as cmos schmitt NAND gate CD4093,74HC24 of high input impedance charcteristic.CMOS
Schmitt inverter or the upper limit threshold voltage of cmos schmitt NAND gate, lower limit threshold voltage are relevant to device solid
Definite value, therefore, positive narrow pulse width, the negative narrow pulse width needs for adjusting the input that can be filtered are normal by changing the charging time
Number, discharge time constant carry out.It is constituted with schmitt inverter or Schmidt's NAND gate with phase Schmidt circuit, is needed
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.
Claims (5)
1. a kind of locomotive speed sensor device signal filtering equipment, it is characterised in that:
Including quick discharging circuit, quick-charging circuit, charge and discharge resistance, capacitor, Schmidt circuit；
The input of the quick discharging circuit is input pulse, and output end is connected to Schmidt circuit input terminal；
The input of the quick-charging circuit is input pulse, and output end is connected to Schmidt circuit input terminal；
One end of the capacitor is connected to Schmidt circuit input terminal, other end be connected to described device publicly either
Power supply；
The output end of the Schmidt circuit is output pulse ends；
The quick discharging circuit includes repid discharge diode, repid discharge switch；The repid discharge diode and quickly
Discharge switch series connection；The quick-charging circuit includes quick charge diode, fast charge switch；Two pole of quick charge
Pipe is connected with fast charge switch；
The unidirectional current flow direction of the repid discharge diode is to flow to input terminal from quick discharging circuit output end；It is described quick
The unidirectional current flow direction of charging diode is to flow to output end from quick charge diode input terminal；
One end of the charge and discharge resistance is input pulse, and other end is connected to Schmidt circuit input terminal；
The repid discharge switch, fast charge switch are by output pulse control；
The repid discharge switch, fast charge switch are by exporting pulse controlled specific method, when Schmidt circuit is same
When phase Schmidt circuit, low level control repid discharge switch connection, the fast charge switch shutdown of pulse are exported, pulse is exported
High level control repid discharge switch OFF, fast charge switch connect；When Schmidt circuit is reverse phase Schmidt circuit,
High level control repid discharge switch connection, the fast charge switch shutdown of pulse are exported, the low level control for exporting pulse is fast
Fast discharge switch shutdown, fast charge switch are connected.
2. locomotive speed sensor device signal filtering equipment according to claim 1, it is characterised in that: the repid discharge is opened
It closes and fast charge switch is numerically controlled multiway analog switch.
3. locomotive speed sensor device signal filtering equipment described in any one of -2 according to claim 1, it is characterised in that: energy
The positive narrow pulse width enough filtered is carried out by changing the upper limit threshold voltage of charge and discharge electrical time constant or Schmidt circuit
Control, the negative narrow pulse width that can be filtered pass through change charge and discharge electrical time constant or the lower limit threshold voltage of Schmidt circuit
To be controlled.
4. locomotive speed sensor device signal filtering equipment according to claim 3, it is characterised in that: the charge and discharge time
Constant is the product of charge and discharge resistance and capacitor.
5. locomotive speed sensor device signal filtering equipment according to claim 3, it is characterised in that: the Schmidt circuit
With 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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Also Published As
| Publication number | Publication date |
|---|---|
| CN109727447B (en) | 2021-09-07 |
| CN109727447A (en) | 2019-05-07 |
| CN105869386A (en) | 2016-08-17 |
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