CN103401532B - A kind of track signal filter circuit - Google Patents
A kind of track signal filter circuit Download PDFInfo
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- CN103401532B CN103401532B CN201310268367.7A CN201310268367A CN103401532B CN 103401532 B CN103401532 B CN 103401532B CN 201310268367 A CN201310268367 A CN 201310268367A CN 103401532 B CN103401532 B CN 103401532B
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Abstract
The invention discloses a kind of track signal filter circuit, including low-pass filter unit and high pass filter unit, carry out the voltage signal of self-induction coil and export after the bandwidth-limited circuit that is made up of low-pass filter unit and high pass filter unit carries out bandpass filtering and trap processes to processor and carry out signal decoding process.The maximum of low-pass filter unit is 3125Hz by frequency, and stopband attenuation is more than 40dB.The minimum of high pass filter unit is 400Hz by frequency, and stopband attenuation is more than 40dB.The bandwidth-limited circuit being made up of low-pass filter unit and high pass filter unit has trap inhibitory action to 50Hz signal and 150Hz signal, and wherein the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.Track signal filter circuit construction of the present invention is simple, can not only filter the signal outside bandwidth, moreover it is possible to significantly inhibit the interference of power supply network simple signal.
Description
Technical field
The present invention relates to a kind of filter circuit, especially relate to a kind of track signal bandwidth-limited circuit being applied to rail traffic signal system.
Background technology
Track circuit detects for train occupation and provides continuous print to run License Info, and various orbit informations transmit with the form of track signal.Train is by induction coil sensing rail current and is converted to voltage signal, obtains the colour-light signals needed for train operation, speed class signal etc. after processing this signal, and auxiliary train control system controls the operation of train.Track signal is a kind of FSK(Frequency Shift Keying, frequency shift keying) modulation waveform, it is exported according to certain frequency switching resynthesis by the sine wave of two kinds of different frequencies.Different FSK modulation frequencies, the i.e. switching frequency of two kinds of carrier frequency represent different information.The most domestic track cab signal mainly has two kinds of standards: the signal of ZPW2000 standard and the signal of shift frequency standard.The frequency range of domestic shift frequency standard signal is 450Hz～950Hz, and the frequency range of ZPW2000 standard signal is 1650Hz～2650Hz.Therefore the lower limit of band filter be should be less than by frequency or equal to 450Hz, and the upper limit be should be greater than by frequency or equal to 2650Hz.
For the signal of ZPW2000 standard, carrier frequency is 1700Hz, 2000Hz, 2300Hz, 2600Hz.Modulating frequency is 10.3Hz, 11.4Hz, 12.5Hz, 13.6Hz, 14.7 Hz, 15.8Hz, 16.9 Hz, 18 Hz, 19.1 Hz, 20.2Hz, 21.3 Hz, 22.4 Hz, 23.5Hz, 24.6 Hz, 25.7Hz, 26.8Hz, 27.9 Hz, 29Hz.
For the signal of shift frequency standard, carrier frequency is 550Hz, 650Hz, 750Hz, 850Hz.Modulating frequency is 7 Hz, 8 Hz, 8.5 Hz, 9 Hz, 9.5 Hz, 11 Hz, 12.5 Hz, 13.5 Hz, 15 Hz, 16.5Hz, 17.5 Hz, 18.5Hz, 20 Hz, 21.5 Hz, 22.5Hz, 23.5Hz, 24.5Hz, 26Hz.
In existing rail traffic signal system, track signal, in the frequency range of 450Hz-2650Hz, should carry out anti-aliasing bandpass filtering, with the impact on signal processing of the rejection band external signal before Digital Signal Processing.Simultaneously as power supply network uses 50Hz to power, the interference strength of its fundamental component 50Hz signal and third-harmonic component 150Hz signal is bigger, it is necessary to the interference to the two Frequency point carries out trap suppression, thus reduces the power supply network interference to track circuit.
In prior art related to the present invention, generally using integrated filtering chip to realize the bandpass filtering to track signal, its theory diagram is as shown in Figure 1.This circuit is by can be to realize the filter circuit of the forms such as Butterworth, chebyshev, Bessel to the configuration of chip.But the filter circuit stopband attenuation that the shortcoming of the method is designed is not more than 20dB, and does not possess the trap function to 50Hz and 150Hz two frequency bins, it is impossible to the suppression power supply network simple signal impact on track signal.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of track signal filter circuit, track signal is by, after track signal filter circuit of the present invention, filtering the signal outside bandwidth, moreover it is possible to significantly inhibit the interference of power supply network simple signal.
In order to realize foregoing invention purpose, the present invention specifically provides the technic relization scheme of a kind of track signal filter circuit, a kind of track signal filter circuit, including: low-pass filter unit and high pass filter unit.Carry out the voltage signal of self-induction coil to export after the bandwidth-limited circuit being made up of described low-pass filter unit and high pass filter unit carries out bandpass filtering and trap processes to processor and carry out signal decoding process.The maximum of described low-pass filter unit is 3125Hz by frequency, and stopband attenuation is more than 40dB.The minimum of described high pass filter unit is 400Hz by frequency, and stopband attenuation is more than 40dB.The described bandwidth-limited circuit being made up of low-pass filter unit and high pass filter unit has trap inhibitory action to 50Hz signal and 150Hz signal, and wherein the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.Described low-pass filter unit uses eight rank ellipse switched capacitor active low-pass filter circuits, and described high pass filter unit realizes 4 rank Chebyshev II type high-pass filtering circuits by operational amplifier cascade formation.Described high pass filter unit is formed by 6 operational amplification circuit cascades including operational amplifier, resistance and electric capacity.The cut-off frequency of described high pass filter unit is 400Hz, is 1 to signal filtering gain in passband, and the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.
Preferably, described come self-induction coil voltage signal first pass through described low-pass filter unit and carry out low-pass filtering treatment, enter back into after described high pass filter unit carries out high-pass filtering process, then output be to described processor.
Preferably, described come self-induction coil voltage signal first pass through described high pass filter unit and carry out high-pass filtering process, enter back into after described low-pass filter unit carries out low-pass filtering treatment, then output be to described processor.
Preferably, described low-pass filter unit uses MAX293 filtering chip.
Preferably, the input clock frequency of described low-pass filter unit uses 5M crystal oscillator by 2 four frequency dividing chips or to use enumerator to obtain input clock frequency frequency dividing.
Preferably, resistance between described low-pass filter unit IN end and earth terminal is 10K, resistance between described low-pass filter unit OUT terminal and OP_IN end is 10K, described low-pass filter unit OP_IN end is 10K with the resistance of OP_OUT end, and described low-pass filter unit OP_IN end is 1000PF with the electric capacity of OP_OUT end.
Preferably, described high pass filter unit includes the first operation amplifier unit and the second operation amplifier unit, described first operation amplifier unit and the second operation amplifier unit use identical circuit structure, described first operation amplifier unit and the second operation amplifier unit to be formed by 3 operational amplification circuit cascades.
Described first operation amplifier unit includes the first operational amplifier, the second operational amplifier and the 3rd operational amplifier.It is provided with resistance between signal input part Vin and the first operational amplifier negative input end, between described first operational amplifier negative input end and outfan, is provided with the parallel circuit of resistance and electric capacity.It is provided with resistance between described first operational amplifier output terminal and the second operational amplifier negative input end, it is provided with resistance between described signal input part Vin and the second operational amplifier negative input end, between described second operational amplifier negative input end and outfan, is provided with resistance.It is provided with resistance between described second operational amplifier output terminal and described 3rd operational amplifier negative input end, it is provided with resistance between described signal input part Vin and described 3rd operational amplifier negative input end, it is provided with electric capacity between described 3rd operational amplifier negative input end and outfan, being provided with resistance between described 3rd operational amplifier output terminal and described first operational amplifier negative input end, the output end signal of described second operational amplifier is as the signal input part Vin2 of described second operation amplifier unit.
Described second operation amplifier unit includes four-operational amplifier, the 5th operational amplifier and the 6th operational amplifier.It is provided with resistance between signal input part Vin2 and four-operational amplifier negative input end, between described four-operational amplifier negative input end and outfan, is provided with the parallel circuit of resistance and electric capacity.It is provided with resistance between described four-operational amplifier outfan and the 5th operational amplifier negative input end, it is provided with resistance between described signal input part Vin2 and the 5th operational amplifier negative input end, between described 5th operational amplifier negative input end and outfan, is provided with resistance.It is provided with resistance between described 5th operational amplifier output terminal and described 6th operational amplifier negative input end, it is provided with resistance between described signal input part Vin2 and described 6th operational amplifier negative input end, it is provided with electric capacity between described 6th operational amplifier negative input end and outfan, being provided with resistance between outfan and the described four-operational amplifier negative input end of described 6th operational amplifier, the output end signal of described 5th operational amplifier is as the signal output part Vout of high pass filter unit.
Preferably, the resistance between described signal input part Vin and the first operational amplifier input-end is 5.6K, and the resistance that described first operational amplifier inputs-holds between outfan is 5.6K, and electric capacity is 47nF.Resistance between described first operational amplifier output terminal and the second operational amplifier input-end is 10K, resistance between described signal input part Vin and the second operational amplifier input-end is 10K, and the resistance that described second operational amplifier inputs-holds between outfan is 10K.Resistance between described second operational amplifier output terminal and described 3rd operational amplifier input-end is 10K, resistance between described signal input part Vin and the 3rd operational amplifier input-end is 300K, the electric capacity that described 3rd operational amplifier inputs-holds between outfan is 47nF, and the resistance between described 3rd operational amplifier output terminal and described first operational amplifier input-end is 10K.
Resistance between described signal input part Vin2 and four-operational amplifier input-end is 15K, and it is 15K that described four-operational amplifier inputs-hold the resistance between outfan, and electric capacity is 47nF.Resistance between described four-operational amplifier outfan and the 5th operational amplifier input-end is 10K, resistance between described signal input part Vin2 and the 5th operational amplifier input-end is 10K, and the resistance that described 5th operational amplifier inputs-holds between outfan is 10K.Resistance between described 5th operational amplifier output terminal and described 6th operational amplifier input-end is 10K, resistance between described signal input part Vin2 and the 6th operational amplifier input-end is 56K, the electric capacity that described 6th operational amplifier inputs-holds between outfan is 47nF, and the resistance between described 6th operational amplifier output terminal and described four-operational amplifier input-end is 10K.
Preferably, the maximum of described low-pass filter unit is 3120Hz by frequency.
Preferably, the minimum of described high pass filter unit is 450Hz by frequency.
Preferably, the maximum of described low-pass filter unit is 2700Hz by frequency.
Preferably, the maximum of described low-pass filter unit is 2600Hz by frequency.
By implementing the technical scheme of a kind of track signal filter circuit that the invention described above provides, have the following technical effect that
(1) circuit structure of track signal filter circuit of the present invention is simple, can realize based on general filter chip, operational amplifier and common resistance capacitance；
(2) track signal filter circuit of the present invention is 1 to the gain of logical inband signaling, does not affect the transmission of useful signal；
(3) track signal filter circuit of the present invention is on the premise of the signal filtered outside bandwidth, suppresses substantially to the mono-tone interference of power supply network, when 50Hz and 150Hz interference signal is more than useful signal 100 times, decodes by not interfering with signal after this filter circuit.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural principle block diagram using integrating filtering chip to realize carrying out signal bandpass filtering in prior art.
Fig. 2 is the structural principle block diagram of a kind of detailed description of the invention of track signal filter circuit of the present invention.
Fig. 3 is the circuit theory diagrams of low-pass filter unit in a kind of detailed description of the invention of track signal filter circuit of the present invention.
Fig. 4 is the circuit theory diagrams of high pass filter unit in a kind of detailed description of the invention of track signal filter circuit of the present invention.
Fig. 5 is the spectral response schematic diagram of track signal filter circuit of the present invention a kind of detailed description of the invention high pass filter unit.
Fig. 6 is the actual measurement spectral response schematic diagram of track signal filter circuit of the present invention a kind of ribbon pass filter.
Fig. 7 is the structural principle block diagram of track signal filter circuit another kind detailed description of the invention of the present invention.
In figure: 1-low-pass filter unit, 2-high pass filter unit, 3-induction coil, 4-processor, A11-the first operational amplifier, A12-the second operational amplifier, A13-the 3rd operational amplifier, A14-four-operational amplifier, A15-the 5th operational amplifier, A16-the 6th operational amplifier, R11, R12, R13, R14, R15, R16, R17, R18, R21, R22, R23, R24, R25, R26, R27, R28-resistance, C11, C12, C13, C14-electric capacity.
Detailed description of the invention
For the sake of quoting and understanding, by the technical term being used below, write a Chinese character in simplified form or abridge and be described below:
FSK:Frequency Shift Keying, frequency shift keyed abbreviation, utilize the frequency change of carrier wave to transmit digital information, be to utilize the discrete characteristics taking value of baseband digital signal to go keyed carrier frequency to transmit a kind of digital modulation technique of information；
Butterworth wave filter: Butterworth filter, is the one of electronic filter, and the feature of Butterworth filter is that the frequency response curve in passband is the most smooth, does not rise and fall, and being then gradually reduced at suppressed frequency band is zero.On the Bode diagram of the logarithm diagonal frequencies of amplitude, from the beginning of a certain rim angle frequency, amplitude gradually reduces along with the increase of angular frequency, tends to minus infinity；
Chebyshev wave filter: Chebyshev filter, is the one of electronic filter, is the wave filter at ripples such as passband or stopband upper frequency response amplitudes；
Bessel wave filter: Bessel filter, is the one of electronic filter, and in electronics and signal processing, Bessel filter is the linear filter of the group delay (linear phase response) with maximally-flat.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
As shown in accompanying drawing 2 to accompanying drawing 7, giving the present invention specific embodiment of a kind of track signal filter circuit, the invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
The detailed description of the invention of a kind of track signal filter circuit as shown in Figure 2, including: low-pass filter unit 1 and high pass filter unit 2.Carry out the voltage signal of self-induction coil 3 to export after the bandwidth-limited circuit being made up of low-pass filter unit 1 and high pass filter unit 2 carries out bandpass filtering and trap processes to processor 4 and carry out signal decoding process.The maximum of low-pass filter unit 1 is 3125Hz by frequency, is set to 3120Hz as the case may be as in one of the present invention preferably embodiment, and stopband attenuation is more than 40dB.The minimum of high pass filter unit 2 more than 400Hz, is set to 450Hz by frequency in one of the present invention preferably embodiment as the case may be, and stopband attenuation is more than 40dB.The bandwidth-limited circuit being made up of low-pass filter unit 1 and high pass filter unit 2 has trap inhibitory action to 50Hz signal and 150Hz signal, and wherein the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.Therefore, after the bandwidth-limited circuit that the track signal of reception is described by the specific embodiment of the invention, the signal outside bandwidth can not only be filtered, moreover it is possible to significantly inhibit the interference of power supply network simple signal.As one of the present invention preferably embodiment, the maximum of low-pass filter unit 1 is 2700Hz or 2600Hz by frequency.
A kind of detailed description of the invention as shown in Figure 2, carrys out the voltage signal of self-induction coil 3 and first passes through low-pass filter unit 1 and carry out low-pass filtering treatment, enters back into after high pass filter unit 2 carries out high-pass filtering process, then exports to processor 4.
Another kind of detailed description of the invention as shown in Figure 7, carry out the voltage signal of self-induction coil 3 to first pass through high pass filter unit 2 and carry out high-pass filtering process, enter back into after low-pass filter unit 1 carries out low-pass filtering treatment, exporting to processor 4, this embodiment is equally reached the effect of aforementioned embodiments again.
As shown in Figure 3, low-pass filter unit 1 uses eight rank ellipse switched capacitor active low-pass filter circuits.As one of the present invention preferred embodiment, low-pass filter unit 1 uses MAX293 filtering chip further.MAX293 is eight rank ellipse switched capacitor active low-pass filter circuits, and its 3dB cut-off frequency can need a clock to carry out drive circuit works 0.1～25kHz, and this clock frequency is 100 times of 3dB cut-off frequency.As one of the present invention preferred embodiment, the input clock frequency B_CLK1 of low-pass filter unit 1 uses 5M crystal oscillator by 2 four frequency dividing chips or to use enumerator to obtain input clock frequency frequency dividing further.Now, be output as 312.5KHz(and be similar to 312KHz) square-wave signal, so the 3dB cut-off frequency of MAX293 is 3.12kHz, and required passband just falls in this low-pass filter circuit free transmission range.Schematic diagram is as it is shown on figure 3, B_CLK1 is the square-wave signal of 312kHz, to should the cut-off frequency of low-pass filter circuit be 3120Hz.Track signal is inputted by IN end, and S end exports.
As shown in Figure 4, high pass filter unit 2 realizes 4 rank Chebyshev II type high-pass filtering circuits by operational amplifier cascade formation.High pass filter unit 2 is formed by 6 operational amplification circuit cascades including operational amplifier, resistance and electric capacity.The cut-off frequency of high pass filter unit 2 is 400Hz, for filtering the low frequency signal of below 400Hz, and can also be the interference filtering from work net by this high pass filter unit 2.This circuit is 1 to signal filtering gain in passband, and the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.Spectral response after emulating the circuit of this high pass filter unit 2 is as shown in Figure 5.From in accompanying drawing 5, this filter circuit is more than 5dB more than 40dB, the decay to 50Hz simple signal more than 60dB, the decay to 10Hz simple signal to the decay of low frequency signal.
Resistance between IN end and the earth terminal of low-pass filter unit 1 is 10K, resistance between OUT terminal and the OP_IN end of low-pass filter unit 1 is 10K, the OP_IN end of low-pass filter unit 1 and the resistance of OP_OUT end are 10K, and the OP_IN end of low-pass filter unit 1 and the electric capacity of OP_OUT end are 1000PF.
High pass filter unit 2 includes the first operation amplifier unit and the second operation amplifier unit, first operation amplifier unit and the second operation amplifier unit use identical circuit structure, the first operation amplifier unit and the second operation amplifier unit to be formed by 3 operational amplification circuit cascades.First operation amplifier unit includes the first operational amplifier A the 11, second operational amplifier A 12 and the 3rd operational amplifier A 13.Each operational amplifier all includes inputting-holding, input+hold and outfan, the input of each operational amplifier+hold equal ground connection.
Resistance between signal input part Vin and the first operational amplifier A 11 input-hold is 5.6K, and it is 5.6K that the first operational amplifier A 11 inputs-hold the resistance between outfan, and electric capacity is 47nF.Resistance between first operational amplifier A 11 outfan and the second operational amplifier A 12 input-hold is 10K, resistance between signal input part Vin and the second operational amplifier A 12 input-hold is 10K, and it is 10K that the second operational amplifier A 12 inputs-hold the resistance between outfan.Resistance between second operational amplifier A 12 outfan and the 3rd operational amplifier A 13 input-hold is 10K, and the resistance between signal input part Vin and the 3rd operational amplifier A 13 input-hold is 300K.It is 47nF that 3rd operational amplifier A 13 inputs-hold the electric capacity between outfan, resistance between 3rd operational amplifier A 13 outfan and the first operational amplifier A 11 input-hold is 10K, and the output end signal of the second operational amplifier A 12 is as the signal input part Vin2 of the second operation amplifier unit.
Second operation amplifier unit includes four-operational amplifier A14, the 5th operational amplifier A 15 and the 6th operational amplifier A 16, and each operational amplifier all includes inputting-holding, input+hold and outfan, the input of each operational amplifier+hold equal ground connection.Resistance between signal input part Vin2 and four-operational amplifier A14 input-end is 15K, and it is 15K that four-operational amplifier A14 inputs-hold the resistance between outfan, and electric capacity is 47nF.Resistance between four-operational amplifier A14 outfan and the 5th operational amplifier A 15 input-hold is 10K, resistance between signal input part Vin2 and the 5th operational amplifier A 15 input-hold is 10K, and it is 10K that the 5th operational amplifier A 15 inputs-hold the resistance between outfan.Resistance between 5th operational amplifier A 15 outfan and the 6th operational amplifier A 16 input-hold is 10K, and the resistance between signal input part Vin2 and the 6th operational amplifier A 16 input-hold is 56K.It is 47nF that 6th operational amplifier A 16 inputs-hold the electric capacity between outfan, resistance between 6th operational amplifier A 16 outfan and four-operational amplifier A14 input-end is 10K, and the output end signal of the 5th operational amplifier A 15 is as the signal output part Vout of high pass filter unit 2.
The actual test result of bandwidth-limited circuit that the specific embodiment of the invention describes is as shown in Figure 6.It can be seen that stopband attenuation is more than 60dB, and more than attenuation desired in emulation, the decay to 50Hz and 150Hz signal simultaneously is more than 100dB, and the filter effect of actual measurement meets design requirement.
The track signal filter circuit that the specific embodiment of the invention describes is by a MAX293 filtering chip and 6 operational amplifier composition bandwidth-limited circuits, a kind of track signal filter circuit is designed for the interference in track circuit, out of band signal is filtered and suppresses power supply network mono-tone interference, to ensure the reliability and stability that track signal processes by the filter circuit utilizing low-pass filter and operational amplifier to constitute.
The technical scheme that the specific embodiment of the invention describes utilizes MAX293 to build the low-pass filter circuit being suitable for track circuit.Obtain the filtering reference clock 312kHz needed for MAX293 chip by simple frequency dividing, sets low-pass cut-off frequencies as 3.12kHz, meet the requirement of the low-pass filtering to track-circuit signalling and filtering gain is 1, i.e. the signal in passband is not the most amplified and the most do not decay.Operational amplifier is utilized to build the high-pass filtering circuit being suitable for track circuit.By operational amplifier and have canonical parameter and the resistance capacitance being widely used, the High Pass Filter Cutoff Frequency of design considers to be designed as 400Hz, meets high-pass filtering requirement, and filtering gain is 1, i.e. the most do not amplify the signal in passband and the most do not decay.By capacitance-resistance parameter determined by debugging, the wave filter that associative operation amplifier is formed can have significantly suppression to 50Hz and 150Hz mono-tone interference signal, and detailed resistance capacitance parameter value is as shown in the high-pass filtering circuit schematic diagram of accompanying drawing 4.
The circuit structure of the track signal filter circuit that the specific embodiment of the invention describes is simple, can realize based on general filter chip, operational amplifier and common resistance capacitance.Track signal filter circuit is 1 to the gain of logical inband signaling, does not affect the transmission of useful signal.The mono-tone interference of power supply network can be suppressed substantially on the premise of the signal filtered outside bandwidth by track signal filter circuit, when 50Hz and 150Hz interference signal is more than useful signal 100 times, decodes by not interfering with signal after this filter circuit.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and between each embodiment, identical similar portion sees mutually.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction.Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.Any those of ordinary skill in the art, in the case of without departing from the spirit of the present invention and technical scheme, technical solution of the present invention is made many possible variations and modification by the method and the technology contents that all may utilize the disclosure above, or is revised as the Equivalent embodiments of equivalent variations.Therefore, every content without departing from technical solution of the present invention, to any simple modification made for any of the above embodiments, equivalent, equivalence change and modify according to the technical spirit of the present invention, all still fall within the range of technical solution of the present invention protection.
Claims (12)
1. a track signal filter circuit, it is characterized in that, including low-pass filter unit (1) and high pass filter unit (2), carry out the voltage signal of self-induction coil (3) and export after the bandwidth-limited circuit that is made up of described low-pass filter unit (1) and high pass filter unit (2) carries out bandpass filtering and trap processes to processor (4) and carry out signal decoding process；The maximum of described low-pass filter unit (1) is 3125Hz by frequency, and stopband attenuation is more than 40dB；The minimum of described high pass filter unit (2) is 400Hz by frequency, and stopband attenuation is more than 40dB；The described bandwidth-limited circuit being made up of low-pass filter unit (1) and high pass filter unit (2) has trap inhibitory action to 50Hz signal and 150Hz signal, and wherein the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal；Described low-pass filter unit (1) uses eight rank ellipse switched capacitor active low-pass filter circuits, and described high pass filter unit (2) realizes 4 rank Chebyshev II type high-pass filtering circuits by operational amplifier cascade formation；Described high pass filter unit (2) is formed by 6 operational amplification circuit cascades including operational amplifier, resistance and electric capacity；The cut-off frequency of described high pass filter unit (2) is 400Hz, is 1 to signal filtering gain in passband, and the decay to 50Hz signal is more than 60dB more than 80dB, the decay to 150Hz signal.
A kind of track signal filter circuit the most according to claim 1, it is characterized in that: described come self-induction coil (3) voltage signal first pass through described low-pass filter unit (1) and carry out low-pass filtering treatment, enter back into after described high pass filter unit (2) carries out high-pass filtering process, then output is to described processor (4).
A kind of track signal filter circuit the most according to claim 1, it is characterized in that: described come self-induction coil (3) voltage signal first pass through described high pass filter unit (2) and carry out high-pass filtering process, enter back into after described low-pass filter unit (1) carries out low-pass filtering treatment, then output is to described processor (4).
4. according to a kind of track signal filter circuit according to any one of claim 1,2 or 3, it is characterised in that: described low-pass filter unit (1) uses MAX293 filtering chip.
A kind of track signal filter circuit the most according to claim 4, it is characterised in that: the input clock frequency of described low-pass filter unit (1) uses 5M crystal oscillator by 2 four frequency dividing chips or to use enumerator frequency dividing to obtain.
A kind of track signal filter circuit the most according to claim 5, it is characterized in that: the resistance between described low-pass filter unit (1) IN end and earth terminal is 10K, resistance between described low-pass filter unit (1) OUT terminal and OP_IN end is 10K, described low-pass filter unit (1) OP_IN end is 10K with the resistance of OP_OUT end, and described low-pass filter unit (1) OP_IN end is 1000PF with the electric capacity of OP_OUT end.
7. according to a kind of track signal filter circuit according to any one of claim 1,2,3,5 or 6, it is characterised in that:
Described high pass filter unit (2) includes the first operation amplifier unit and the second operation amplifier unit, described first operation amplifier unit and the second operation amplifier unit use identical circuit structure, described first operation amplifier unit and the second operation amplifier unit to be formed by 3 operational amplification circuit cascades；
Described first operation amplifier unit includes the first operational amplifier (A11), the second operational amplifier (A12) and the 3rd operational amplifier (A13)；Being provided with resistance between signal input part Vin and the first operational amplifier (A11) negative input end, described first operational amplifier (A11) is provided with the parallel circuit of resistance and electric capacity between negative input end and outfan；It is provided with resistance between described first operational amplifier (A11) outfan and the second operational amplifier (A12) negative input end, being provided with resistance between described signal input part Vin and the second operational amplifier (A12) negative input end, described second operational amplifier (A12) is provided with resistance between negative input end and outfan；It is provided with resistance between described second operational amplifier (A12) outfan and described 3rd operational amplifier (A13) negative input end, it is provided with resistance between described signal input part Vin and described 3rd operational amplifier (A13) negative input end, described 3rd operational amplifier (A13) is provided with electric capacity between negative input end and outfan, it is provided with resistance between described 3rd operational amplifier (A13) outfan and described first operational amplifier (A11) negative input end, the output end signal of described second operational amplifier (A12) is as the signal input part Vin2 of described second operation amplifier unit；
Described second operation amplifier unit includes four-operational amplifier (A14), the 5th operational amplifier (A15) and the 6th operational amplifier (A16)；Being provided with resistance between signal input part Vin2 and four-operational amplifier (A14) negative input end, described four-operational amplifier (A14) is provided with the parallel circuit of resistance and electric capacity between negative input end and outfan；It is provided with resistance between described four-operational amplifier (A14) outfan and the 5th operational amplifier (A15) negative input end, being provided with resistance between described signal input part Vin2 and the 5th operational amplifier (A15) negative input end, described 5th operational amplifier (A15) is provided with resistance between negative input end and outfan；It is provided with resistance between described 5th operational amplifier (A15) outfan and described 6th operational amplifier (A16) negative input end, it is provided with resistance between described signal input part Vin2 and described 6th operational amplifier (A16) negative input end, described 6th operational amplifier (A16) is provided with electric capacity between negative input end and outfan, it is provided with resistance between outfan and described four-operational amplifier (A14) negative input end of described 6th operational amplifier (A16), the output end signal of described 5th operational amplifier (A15) is as the signal output part Vout of high pass filter unit (2).
A kind of track signal filter circuit the most according to claim 7, it is characterised in that:
Resistance between described signal input part Vin and the first operational amplifier (A11) negative input end is 5.6K, and described first operational amplifier (A11) resistance between negative input end and outfan is 5.6K, and electric capacity is 47nF；Resistance between described first operational amplifier (A11) outfan and the second operational amplifier (A12) negative input end is 10K, resistance between described signal input part Vin and the second operational amplifier (A12) negative input end is 10K, and described second operational amplifier (A12) resistance between negative input end and outfan is 10K；Resistance between described second operational amplifier (A12) outfan and described 3rd operational amplifier (A13) negative input end is 10K, resistance between described signal input part Vin and the 3rd operational amplifier (A13) negative input end is 300K, described 3rd operational amplifier (A13) electric capacity between negative input end and outfan is 47nF, and the resistance between described 3rd operational amplifier (A13) outfan and described first operational amplifier (A11) negative input end is 10K；
Resistance between described signal input part Vin2 and four-operational amplifier (A14) negative input end is 15K, and the described four-operational amplifier (A14) resistance between negative input end and outfan is 15K, and electric capacity is 47nF；Resistance between described four-operational amplifier (A14) outfan and the 5th operational amplifier (A15) negative input end is 10K, resistance between described signal input part Vin2 and the 5th operational amplifier (A15) negative input end is 10K, and described 5th operational amplifier (A15) resistance between negative input end and outfan is 10K；Resistance between described 5th operational amplifier (A15) outfan and described 6th operational amplifier (A16) negative input end is 10K, resistance between described signal input part Vin2 and the 6th operational amplifier (A16) negative input end is 56K, described 6th operational amplifier (A16) electric capacity between negative input end and outfan is 47nF, and the resistance between described 6th operational amplifier (A16) outfan and described four-operational amplifier (A14) negative input end is 10K.
9. according to a kind of track signal filter circuit according to any one of claim 1,2,3,5,6 or 8, it is characterised in that: the maximum of described low-pass filter unit (1) is 3120Hz by frequency.
A kind of track signal filter circuit the most according to claim 9, it is characterised in that: the minimum of described high pass filter unit (2) is 450Hz by frequency.
11. according to a kind of track signal filter circuit according to any one of claim 1,2,3,5,6,8 or 10, it is characterised in that: the maximum of described low-pass filter unit (1) is 2700Hz by frequency.
12. according to a kind of track signal filter circuit according to any one of claim 1,2,3,5,6,8 or 10, it is characterised in that: the maximum of described low-pass filter unit (1) is 2600Hz by frequency.
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| CN107732387A (en) * | 2017-09-29 | 2018-02-23 | 德清利维通讯科技股份有限公司 | Wave filter |
| CN109450402B (en) * | 2018-11-08 | 2022-06-10 | 哈尔滨工业大学 | Fourteen-order switched capacitor band-pass filter |
| CN113114165B (en) * | 2021-03-25 | 2022-07-05 | 中国电子科技集团公司第三十研究所 | Cascade multi-notch ultra-wideband filter circuit based on band-pass phase cancellation |
| CN115277592B (en) * | 2022-07-20 | 2023-04-11 | 哈尔滨市科佳通用机电股份有限公司 | Decoding method of locomotive signal equipment during signal switching |
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