CN103401532A - Track signal filtering circuit - Google Patents
Track signal filtering circuit Download PDFInfo
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- CN103401532A CN103401532A CN2013102683677A CN201310268367A CN103401532A CN 103401532 A CN103401532 A CN 103401532A CN 2013102683677 A CN2013102683677 A CN 2013102683677A CN 201310268367 A CN201310268367 A CN 201310268367A CN 103401532 A CN103401532 A CN 103401532A
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Abstract
The invention discloses a track signal filtering circuit which comprises a low-pass filtering unit and a high-pass filtering unit. Band-pass filtering and trapped wave processing are carried out by a band-pass filtering circuit formed by the low-pass filtering unit and the high-pass filtering unit on voltage signals from an induction coil, and the processed voltage signals are outputted to a processor to receive signal decoding processing. The maximum passing frequency of the low-pass filtering unit is 3125Hz, and the stop-band attenuation is greater than 40dB. The minimum passing frequency of the high-pass filtering unit is 400Hz, and the stop-band attenuation is greater than 40dB. The band-pass filtering circuit formed by the low-pass filtering unit and the high-pass filtering unit has a trapped wave suppressing effect on 50Hz signals and 150Hz signals, wherein the attenuation for the 50Hz signals is greater than 80dB, and the attenuation for the 150Hz signals is greater than 60dB. The track signal filtering circuit disclosed by the invention is simple in structure, not only can filter signals outside the bandwidth, but also can suppress interferences of power supply network single-frequency signals substantially.
Description
Technical field
The present invention relates to a kind of filter circuit, especially relate to a kind of track signal bandwidth-limited circuit that is applied to rail traffic signal system.
Background technology
Track circuit is used for train occupation and detects and continuous operation License Info is provided, and various orbit informations transmit with the form of track signal.Train is responded to rail current and is converted to voltage signal by induction coil, and this signal is processed the required colour-light signals of rear acquisition train operation, speed class signal etc., and auxiliary train control system is controlled the operation of train.Track signal is a kind of FSK(Frequency Shift Keying, frequency shift keying) modulation waveform, it synthesizes output by the sine wave of two kinds of different frequencies again according to the certain frequency switching.Different FSK modulating frequencies, namely the switching frequency of two kinds of carrier frequency represents different information.Domestic rail locomotive signal mainly contains two kinds of standards at present: the signal of the signal of ZPW2000 standard and 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 pass filter should be less than or equal to 450Hz by frequency, and the upper limit should be more than or equal to 2650Hz by frequency.
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, 26 Hz.
In existing rail traffic signal system, track signal in the frequency range of 450Hz-2650Hz, should carry out anti-aliasing bandpass filtering before Digital Signal Processing, with the impact of rejection band external signal on the signal processing.Simultaneously, because power supply network adopts the 50Hz power supply, the interference strength of its fundamental component 50Hz signal and third-harmonic component 150Hz signal is larger, must carry out trap to the interference of these two Frequency points and suppress, thereby reduce the interference of power supply network to track circuit.
In prior art scheme related to the present invention, usually adopt the bandpass filtering of integrated filtering chip realization to track signal, its theory diagram is as shown in Figure 1.This circuit can be realized the filter circuit of the forms such as Butterworth, chebyshev, Bessel by the configuration to chip.Can be greater than 20dB but the shortcoming of the method is designed filter circuit stopband attenuation, and do not possess trap function to 50Hz and two frequencies of 150Hz, can't suppress the impact of power supply network simple signal on track signal.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of track signal filter circuit, track signal by track signal filter circuit of the present invention after, can not only the filtering bandwidth outer signal, can also significantly suppress the interference of power supply network simple signal.
In order to realize the foregoing invention purpose, the present invention specifically provides a kind of technic relization scheme of track signal filter circuit, and a kind of track signal filter circuit comprises: low-pass filter unit and high pass filter unit.The voltage signal that carrys out self-induction coil carries out after bandpass filtering and trap are processed exporting to processor through the bandwidth-limited circuit that is comprised of described low-pass filter unit and high pass filter unit and carries out signal decoding and process.The maximum of described low-pass filter unit is 3125Hz by frequency, and stopband attenuation is greater than 40dB.The minimum of described high pass filter unit is 400Hz by frequency, and stopband attenuation is greater than 40dB.The described bandwidth-limited circuit that is comprised of low-pass filter unit and high pass filter unit has the trap inhibitory action to 50Hz signal and 150Hz signal, wherein to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.
Preferably, describedly come the voltage signal of self-induction coil first through described low-pass filter unit, to carry out low-pass filtering treatment, then enter after described high pass filter unit carries out high-pass filtering and process, then export described processor to.
Preferably, the described voltage signal that carrys out self-induction coil first carries out high-pass filtering through described high pass filter unit to be processed, then after entering described low-pass filter unit and carrying out low-pass filtering treatment, then export described processor to.
Preferably, described low-pass filter unit adopts eight rank ellipse switched capacitor active low-pass filter circuits.
Preferably, described high pass filter unit forms and realizes 4 rank Chebyshev II type high-pass filtering circuits by the operational amplifier cascade.
Preferably, described low-pass filter unit adopts the MAX293 filtering chip.
Preferably, the input clock frequency of described low-pass filter unit adopts the 5M crystal oscillator by 2 four frequency division chips or adopts counter to obtain the input clock frequency frequency division.
Preferably, described high pass filter unit is formed by 6 operational amplification circuit cascades that comprise operational amplifier, resistance and electric capacity.The cut-off frequency of described high pass filter unit is 400Hz, to signal filtering gain in passband, is 1, to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.
Preferably, resistance between described low-pass filter unit IN end and earth terminal is 10K, resistance between described low-pass filter unit OUT end 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 comprises the first operation amplifier unit and the second operation amplifier unit, described the first operation amplifier unit adopts identical circuit structure with the second operation amplifier unit, and described the first operation amplifier unit and the second operation amplifier unit form by 3 operational amplification circuit cascades.Described the first operation amplifier unit comprises the first operational amplifier, the second operational amplifier and the 3rd operational amplifier.
Resistance between signal input part Vin and the first operational amplifier input-end is 5.6K, and the resistance between described first operational amplifier input-end and output is 5.6K, and electric capacity is 47nF.Resistance between described the 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 between described second operational amplifier input-end and output is 10K.Resistance between described the second operational amplifier output terminal and described the 3rd operational amplifier input-end is 10K, resistance between described signal input part Vin and the 3rd operational amplifier input-end is 300K, electric capacity between described the 3rd operational amplifier input-end and output is 47nF, resistance between described the 3rd operational amplifier output terminal and described first operational amplifier input-end is 10K, and the output end signal of described the second operational amplifier is as the signal input part Vin2 of described the second operation amplifier unit.
Described the second operation amplifier unit comprises four-operational amplifier, the 5th operational amplifier and the 6th operational amplifier, resistance between described signal input part Vin2 and four-operational amplifier input-end is 15K, resistance between described four-operational amplifier input-end and output is 15K, and electric capacity is 47nF.Resistance between described four-operational amplifier output 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 between described the 5th operational amplifier input-end and output is 10K.Resistance between described the 5th operational amplifier output terminal and described the 6th operational amplifier input-end is 10K, resistance between described signal input part Vin2 and the 6th operational amplifier input-end is 56K, electric capacity between described the 6th operational amplifier input-end and output is 47nF, resistance between described the 6th operational amplifier output terminal and described four-operational amplifier input-end is 10K, and the output end signal of described the 5th operational amplifier is as the signal output part Vout of high pass filter unit.
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 following technique effect:
(1) circuit structure of track signal filter circuit of the present invention is simple, based on general filter chip, operational amplifier and common resistance capacitance, can realize;
(2) track signal filter circuit of the present invention is 1 to the gain of signal in passband, does not affect the transmission of useful signal;
(3) under the prerequisite of the signal of track signal filter circuit of the present invention outside the filtering bandwidth, the single-frequency of power supply network is disturbed and suppressed obviously, when 50Hz and 150Hz interference signal during greater than 100 times of useful signals, by not affecting signal decoding after this filter circuit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural principle block diagram that available technology adopting integrating filtering chip realizes signal is carried out bandpass filtering.
Fig. 2 is the structural principle block diagram of a kind of embodiment 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 embodiment 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 embodiment of track signal filter circuit of the present invention.
Fig. 5 is the spectral response schematic diagram of a kind of embodiment high pass filter unit of track signal filter circuit of the present invention.
Fig. 6 is the actual measurement spectral response schematic diagram of a kind of embodiment bandpass filtering of track signal filter circuit of the present invention.
Fig. 7 is the structural principle block diagram of the another kind of embodiment of track signal filter circuit of the present invention.
In figure: the 1-low-pass filter unit, the 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.
Embodiment
For quote and know for the purpose of, with the technical term that hereinafter uses, 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 carry out transmitting digital information, is to utilize the discrete value characteristics of baseband digital signal to remove a kind of digital modulation technique of keyed carrier frequency with transmission of information;
The Butterworth filter: Butterworth filter is a kind of of electronic filter, and the characteristics of Butterworth filter are that the frequency response curve in passband is smooth to greatest extent, do not rise and fall, and at suppressed frequency band, drop to gradually zero.On the Bode diagram of the logarithm diagonal frequencies of amplitude, from a certain rim angle frequency, amplitude the increase of angular frequency and is gradually reduced, the trend minus infinity;
The Chebyshev filter: Chebyshev filter is a kind of of electronic filter, is the filter at ripples such as passband or stopband upper frequency response amplitudes;
The Bessel filter: Bessel filter is a kind of of electronic filter, and in electronics and signal were processed, Bessel filter was the linear filter of group delay (linear phase response) with maximally-flat.
For the purpose, technical scheme and the advantage that make the embodiment of the present invention 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 embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
, to as shown in accompanying drawing 7, provided the specific embodiment of a kind of track signal filter circuit of the present invention as accompanying drawing 2, the invention will be further described below in conjunction with the drawings and specific embodiments.
The embodiment of a kind of track signal filter circuit as shown in Figure 2 comprises: low-pass filter unit 1 and high pass filter unit 2.The voltage signal that carrys out self-induction coil 3 carries out after bandpass filtering and trap are processed exporting to processor 4 through the bandwidth-limited circuit that is comprised of low-pass filter unit 1 and high pass filter unit 2 and carries out signal decoding and process.The maximum of low-pass filter unit 1 is 3125Hz by frequency, and as being made as the case may be 3120Hz in a kind of better execution mode of the present invention, stopband attenuation is greater than 40dB.The minimum of high pass filter unit 2, greater than 400Hz, is made as 450Hz by frequency as the case may be in a kind of better execution mode of the present invention, stopband attenuation is greater than 40dB.The bandwidth-limited circuit that is comprised of low-pass filter unit 1 and high pass filter unit 2 has the trap inhibitory action to 50Hz signal and 150Hz signal, wherein to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.Therefore, after the bandwidth-limited circuit that the track signal of reception is described by the specific embodiment of the invention, can not only the outer signal of filtering bandwidth, can also significantly suppress the interference of power supply network simple signal.As a kind of better execution mode of the present invention, the maximum of low-pass filter unit 1 is 2700Hz or 2600Hz by frequency.
A kind of embodiment as shown in Figure 2, the voltage signal that carrys out self-induction coil 3 first carries out low-pass filtering treatment through low-pass filter unit 1, then enters after high pass filter unit 2 carries out high-pass filtering and process, then exports processor 4 to.
Another kind of embodiment as shown in Figure 7, come the voltage signal of self-induction coil 3 first through high pass filter unit 2, to carry out the high-pass filtering processing, after entering again low-pass filter unit 1 and carrying out low-pass filtering treatment, export processor 4 to, this execution mode can reach the effect of aforementioned embodiments equally again.
As shown in Figure 3, low-pass filter unit 1 adopts eight rank ellipse switched capacitor active low-pass filter circuits.Preferred embodiment a kind of as the present invention, low-pass filter unit 1 further adopts the MAX293 filtering chip.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 at 0.1～25kHz, and this clock frequency is 100 times of 3dB cut-off frequency.Preferred embodiment a kind of as the present invention, the input clock frequency B_CLK1 of low-pass filter unit 1 further adopts the 5M crystal oscillator by 2 four frequency division chips or adopts counter to obtain the input clock frequency frequency division.At this moment, 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 needed passband just in time drops in this low-pass filter circuit free transmission range.As shown in Figure 3, B_CLK1 is the square-wave signal of 312kHz to schematic diagram, to cut-off frequency that should low-pass filter circuit, is 3120Hz.Track signal is held input by IN, and S holds output.
As shown in Figure 4, high pass filter unit 2 forms and realizes 4 rank Chebyshev II type high-pass filtering circuits by the operational amplifier cascade.High pass filter unit 2 is formed by 6 operational amplification circuit cascades that comprise operational amplifier, resistance and electric capacity.The cut-off frequency of high pass filter unit 2 is 400Hz, is used for the following low frequency signal of filtering 400Hz, also can be the interference filtering from the work net by this high pass filter unit 2.This circuit is 1 to signal filtering gain in passband, to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.To the circuit of this high pass filter unit 2 carry out after emulation spectral response as shown in Figure 5.By in accompanying drawing 5 as seen, this filter circuit to the decay of low frequency signal greater than 40dB, to the decay of 50Hz simple signal greater than 60dB, to the decay of 10Hz simple signal greater than 5dB.
The IN end of low-pass filter unit 1 and the resistance between earth terminal are 10K, the OUT end of low-pass filter unit 1 and the resistance between the OP_IN end are 10K, the OP_IN end of low-pass filter unit 1 is 10K with the resistance of OP_OUT end, and the OP_IN end of low-pass filter unit 1 is 1000PF with the electric capacity of OP_OUT end.
High pass filter unit 2 comprises the first operation amplifier unit and the second operation amplifier unit, the first operation amplifier unit adopts identical circuit structure with the second operation amplifier unit, and the first operation amplifier unit and the second operation amplifier unit form by 3 operational amplification circuit cascades.The first operation amplifier unit comprises the first operational amplifier A 11, the second operational amplifier A 12 and the 3rd operational amplifier A 13.Each operational amplifier includes input-end, input+end and output, the equal ground connection of the input of each operational amplifier+hold.
Resistance between signal input part Vin and first operational amplifier A 11 inputs-end is 5.6K, and the resistance between first operational amplifier A 11 inputs-end and output is 5.6K, and electric capacity is 47nF.Resistance between the first operational amplifier A 11 outputs and second operational amplifier A 12 inputs-end is 10K, resistance between signal input part Vin and second operational amplifier A 12 inputs-end is 10K, and the resistance between second operational amplifier A 12 inputs-end and output is 10K.Resistance between the second operational amplifier A 12 outputs and the 3rd operational amplifier A 13 inputs-end is 10K, and the resistance between signal input part Vin and the 3rd operational amplifier A 13 inputs-end is 300K.Electric capacity between the 3rd operational amplifier A 13 inputs-end and output is 47nF, resistance between the 3rd operational amplifier A 13 outputs and first operational amplifier A 11 inputs-end 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.
The second operation amplifier unit comprises four-operational amplifier A14, the 5th operational amplifier A 15 and the 6th operational amplifier A 16, and each operational amplifier includes input-end, input+end and output, the equal ground connection of the input of each operational amplifier+hold.Resistance between signal input part Vin2 and four-operational amplifier A14 input-end is 15K, and the resistance between four-operational amplifier A14 input-end and output is 15K, and electric capacity is 47nF.Resistance between four-operational amplifier A14 output and the 5th operational amplifier A 15 inputs-end is 10K, resistance between signal input part Vin2 and the 5th operational amplifier A 15 inputs-end is 10K, and the resistance between the 5th operational amplifier A 15 inputs-end and output is 10K.Resistance between the 5th operational amplifier A 15 outputs and the 6th operational amplifier A 16 inputs-end is 10K, and the resistance between signal input part Vin2 and the 6th operational amplifier A 16 inputs-end is 56K.Electric capacity between the 6th operational amplifier A 16 inputs-end and output is 47nF, resistance between the 6th operational amplifier A 16 outputs 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 is described as shown in Figure 6.As can be seen from the figure, stopband attenuation is greater than 60dB, and greater than desired attenuation in emulation, simultaneously to the decay of 50Hz and 150Hz signal greater than 100dB, the filter effect of actual measurement meets design requirement.
The track signal filter circuit that the specific embodiment of the invention is described forms bandwidth-limited circuit by a MAX293 filtering chip and 6 operational amplifiers, design a kind of track signal filter circuit for the interference in track circuit, utilize the filter circuit that low-pass filter and operational amplifier form out of band signal is carried out filtering and the power supply network single-frequency is disturbed and suppressed, with the reliability and stability that guarantee that track signal is processed.
The technical scheme that the specific embodiment of the invention is described utilizes MAX293 to build the low-pass filter circuit that is fit to track circuit.Obtain the required filtering reference clock 312kHz of MAX293 chip by simple frequency division, the setting low-pass cut-off frequencies is 3.12kHz, the low-pass filtering requirement and the filter gain that meet track-circuit signalling are 1, namely the signal in passband have not both been amplified not decay yet.Utilize operational amplifier to build the high-pass filtering circuit that is fit to track circuit.By operational amplifier and the resistance capacitance that has canonical parameter and be widely used, the High Pass Filter Cutoff Frequency of design considers to be designed to 400Hz, meet the high-pass filtering requirement, and filter gain is 1, namely the signal in passband both do not amplified not decay yet.By debugging determined capacitance-resistance parameter, the filter that the associative operation amplifier forms can have obvious inhibition to 50Hz and 150Hz single-frequency 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 is described is simple, based on general filter chip, operational amplifier and common resistance capacitance, can realize.The track signal filter circuit is 1 to the gain of signal in passband, does not affect the transmission of useful signal.Under the prerequisite of signal that the track signal filter circuit can be outside the filtering bandwidth, the single-frequency of power supply network is disturbed and suppressed obviously, when 50Hz and 150Hz interference signal during greater than 100 times of useful signals, by not affecting signal decoding after this filter circuit.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
The above, be only preferred embodiment of the present invention, not the present invention done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, in the situation that do not break away from Spirit Essence of the present invention and technical scheme, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (14)
1. track signal filter circuit, it is characterized in that, comprise: low-pass filter unit (1) and high pass filter unit (2), the voltage signal that carrys out self-induction coil (3) carries out after bandpass filtering and trap are processed exporting to processor (4) through the bandwidth-limited circuit that is comprised of described low-pass filter unit (1) and high pass filter unit (2) and carries out signal decoding and process; The maximum of described low-pass filter unit (1) is 3125Hz by frequency, and stopband attenuation is greater than 40dB; The minimum of described high pass filter unit (2) is 400Hz by frequency, and stopband attenuation is greater than 40dB; The described bandwidth-limited circuit that is comprised of low-pass filter unit (1) and high pass filter unit (2) has the trap inhibitory action to 50Hz signal and 150Hz signal, wherein to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.
2. a kind of track signal filter circuit according to claim 1, it is characterized in that: the described voltage signal that carrys out self-induction coil (3) first passes through described low-pass filter unit (1) and carries out low-pass filtering treatment, enter again after described high pass filter unit (2) carries out high-pass filtering and process, then export described processor (4) to.
3. a kind of track signal filter circuit according to claim 1, it is characterized in that: the described voltage signal that carrys out self-induction coil (3) first passes through described high pass filter unit (2) to carry out high-pass filtering and processes, after entering again described low-pass filter unit (1) and carrying out low-pass filtering treatment, then export described processor (4) to.
4. according to claim 2 or 3 described a kind of track signal filter circuits, is characterized in that: described low-pass filter unit (1) employing eight rank ellipse switched capacitor active low-pass filter circuits.
5. a kind of track signal filter circuit according to claim 4 is characterized in that: described high pass filter unit (2) forms and realizes 4 rank Chebyshev II type high-pass filtering circuits by the operational amplifier cascade.
6. according to claim 1, the described a kind of track signal filter circuit of arbitrary claim in 2,3,5, it is characterized in that: described low-pass filter unit (1) adopts the MAX293 filtering chip.
7. a kind of track signal filter circuit according to claim 6 is characterized in that: the input clock frequency of described low-pass filter unit (1) adopts the 5M crystal oscillator by 2 four frequency division chips or adopts counter to obtain the input clock frequency frequency division.
8. according to claim 1, the described a kind of track signal filter circuit of arbitrary claim in 2,3,5,7, it is characterized in that: described high pass filter unit (2) is formed by 6 operational amplification circuit cascades that comprise operational amplifier, resistance and electric capacity; The cut-off frequency of described high pass filter unit (2) is 400Hz, to signal filtering gain in passband, is 1, to the decay of 50Hz signal greater than 80dB, to the decay of 150Hz signal greater than 60dB.
9. a kind of track signal filter circuit according to claim 8, 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 end 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.
10. a kind of track signal filter circuit according to claim 9, it is characterized in that: described high pass filter unit (2) comprises the first operation amplifier unit and the second operation amplifier unit, described the first operation amplifier unit adopts identical circuit structure with the second operation amplifier unit, and described the first operation amplifier unit and the second operation amplifier unit form by 3 operational amplification circuit cascades; Described the first operation amplifier unit comprises the first operational amplifier (A11), the second operational amplifier (A12) and the 3rd operational amplifier (A13);
resistance between signal input part Vin and the first operational amplifier (A11) input-end is 5.6K, and the resistance between described the first operational amplifier (A11) input-end and output is 5.6K, and electric capacity is 47nF, resistance between described the first operational amplifier (A11) output and the second operational amplifier (A12) input-end is 10K, resistance between described signal input part Vin and the second operational amplifier (A12) input-end is 10K, and the resistance between described the second operational amplifier (A12) input-end and output is 10K, resistance between described the second operational amplifier (A12) output and described the 3rd operational amplifier (A13) input-end is 10K, resistance between described signal input part Vin and the 3rd operational amplifier (A13) input-end is 300K, electric capacity between described the 3rd operational amplifier (A13) input-end and output is 47nF, resistance between described the 3rd operational amplifier (A13) output and described the first operational amplifier (A11) input-end is 10K, the output end signal of described the second operational amplifier (A12) is as the signal input part Vin2 of described the second operation amplifier unit,
described the second operation amplifier unit comprises four-operational amplifier (A14), the 5th operational amplifier (A15) and the 6th operational amplifier (A16), resistance between described signal input part Vin2 and four-operational amplifier (A14) input-end is 15K, resistance between described four-operational amplifier (A14) input-end and output is 15K, and electric capacity is 47nF, resistance between described four-operational amplifier (A14) output and the 5th operational amplifier (A15) input-end is 10K, resistance between described signal input part Vin2 and the 5th operational amplifier (A15) input-end is 10K, and the resistance between described the 5th operational amplifier (A15) input-end and output is 10K, resistance between described the 5th operational amplifier (A15) output and described the 6th operational amplifier (A16) input-end is 10K, resistance between described signal input part Vin2 and the 6th operational amplifier (A16) input-end is 56K, electric capacity between described the 6th operational amplifier (A16) input-end and output is 47nF, resistance between described the 6th operational amplifier (A16) output and described four-operational amplifier (A14) input-end is 10K, the output end signal of described the 5th operational amplifier (A15) is as the signal output part Vout of high pass filter unit (2).
11. according to claim 1, the described a kind of track signal filter circuit of arbitrary claim in 2,3,5,7,9,10, it is characterized in that: the maximum of described low-pass filter unit (1) is 3120Hz by frequency.
12. a kind of track signal filter circuit according to claim 11 is characterized in that: the minimum of described high pass filter unit (2) is 450Hz by frequency.
13. according to claim 1 or 12 described a kind of track signal filter circuits, it is characterized in that: the maximum of described low-pass filter unit (1) is 2700Hz by frequency.
14. according to claim 1 or 12 described a kind of track signal filter circuits, it is characterized in that: the maximum of described low-pass filter unit (1) is 2600Hz by frequency.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732387A (en) * | 2017-09-29 | 2018-02-23 | 德清利维通讯科技股份有限公司 | Wave filter |
| CN109428615A (en) * | 2017-08-23 | 2019-03-05 | 硅谷实验室公司 | Using the receiver architecture of the digital isolator of the notch filter for common mode transient state immunity to interference |
| CN109450402A (en) * | 2018-11-08 | 2019-03-08 | 哈尔滨工业大学 | Ten quadravalence switched capacitor bandpass filters |
| CN113114165A (en) * | 2021-03-25 | 2021-07-13 | 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 |
| CN115277592A (en) * | 2022-07-20 | 2022-11-01 | 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109428615A (en) * | 2017-08-23 | 2019-03-05 | 硅谷实验室公司 | Using the receiver architecture of the digital isolator of the notch filter for common mode transient state immunity to interference |
| CN109428615B (en) * | 2017-08-23 | 2021-12-17 | 天工方案公司 | Receiver architecture for digital isolator employing notch filter for common mode transient immunity |
| CN107732387A (en) * | 2017-09-29 | 2018-02-23 | 德清利维通讯科技股份有限公司 | Wave filter |
| CN109450402A (en) * | 2018-11-08 | 2019-03-08 | 哈尔滨工业大学 | Ten quadravalence switched capacitor bandpass filters |
| CN109450402B (en) * | 2018-11-08 | 2022-06-10 | 哈尔滨工业大学 | Fourteen-order switched capacitor band-pass filter |
| CN113114165A (en) * | 2021-03-25 | 2021-07-13 | 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 |
| 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 |
| CN115277592A (en) * | 2022-07-20 | 2022-11-01 | 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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| CN103401532B (en) | 2016-08-10 |
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