CN203101851U - Input circuit of pulse interval measuring system - Google Patents
Input circuit of pulse interval measuring system Download PDFInfo
- Publication number
- CN203101851U CN203101851U CN 201320047276 CN201320047276U CN203101851U CN 203101851 U CN203101851 U CN 203101851U CN 201320047276 CN201320047276 CN 201320047276 CN 201320047276 U CN201320047276 U CN 201320047276U CN 203101851 U CN203101851 U CN 203101851U
- Authority
- CN
- China
- Prior art keywords
- pulse
- input
- links
- resistance
- measuring system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model provides an input circuit of a pulse interval measuring system. The input circuit of the pulse interval measuring system comprises a pulse positive input end PULSE+, a pulse negative input end PULSE- and a pulse output end PULSE 1, wherein the pulse positive input end PULSE+ is connected with the pulse output end PULSE 1 through a hysteresis comparison circuit, and the pulse negative input end PULSE- is connected with a zero potential reference end. The hysteresis comparison circuit comprises an input resistor R1, an input resistor R2, a feedback resistor R3 and a comparator LM1191, after the input resistor R1 is connected with the input resistor R2 in series, one end of the input resistor R1 and the input resistor R2 in series is connected with the pulse positive input end PULSE+, and the other end of the input resistor R1 and the input resistor R2 in series is connected with a positive input end of the comparator LM1191. One end of the feedback resistor R3 is connected with the positive input end of the comparator LM1191, and the other end of the feedback resistor R3 is connected with the pulse output end PULSE 1. The input circuit of the pulse interval measuring system has the advantages that measuring of pulse interval is accurate and efficient through hysteresis comparison, multistage anti-interference measures are set, thus kinds of interference is effectively removed, signals are stable and accurate, the circuit structure is reasonable, cost is low and the effect of improving measuring accuracy is obvious.
Description
Technical field
The utility model relates to the pulse interval field of measuring technique, is specifically related to a kind of input circuit of recurrent interval measuring system.
Background technology
The pulse interval measurement is widely used in fields such as communication, radar, electronic warfare, satellite and navigator fix.For example, the raising of radar ranging accuracy depends on the raising of transponder pulse and echo-pulse time interval measurement precision; The extracted with high accuracy of radar PRI itself is exactly a time interval measurement problem; The critical limitation factor that the multistation passive positioning accuracy improves is the time difference measurement precision; And time difference measurement itself also belongs to the category of time interval measurement.Therefore the high precision time interval measurement method has crucial meaning, owing in actual application environment, there is a large amount of unknown disturbances source, when signal source to be checked through longer cable introduce or shielding measure improper, pulse signal can be polluted, cause the porch erroneous judgement, this has a strong impact on the measuring accuracy of pulse interval.Some time interval measurement methods of current widespread use normally weaken or ignore the existence of interference noise, limit the range of application of these methods, though some method adopts conventional software and hardware filtering technique to suppress the influence of disturbing, there is the contradiction of filter bandwidht and pulse detection system dynamic characteristic again in this class filtering system.
Summary of the invention
At the problems referred to above that prior art exists, the utility model provides a kind of input circuit of recurrent interval measuring system, can well realize the judgement of pulse edge under strong noise environment, and it is more accurate to make the recurrent interval measure.
For achieving the above object, the utility model institute is by the following technical solutions:
The input circuit of recurrent interval measuring system, comprise pulse positive input terminal PULSE+, pulse negative input end PULSE-and pulse output end PULSE1, pulse positive input terminal PULSE+ links to each other with pulse output end PULSE1 by hysteresis comparator circuit, and pulse negative input end PULSE-links to each other with the zero potential reference edge.
Further, described hysteresis comparator circuit comprises input resistance R1, input resistance R2, feedback resistance R3 and comparer LM1191, input resistance R1 links to each other with pulse positive input terminal PULSE+ with input resistance R2 series connection back one end, the other end links to each other with comparer LM1191 positive input terminal, feedback resistance R3 one end links to each other with comparer LM1191 positive input terminal, and the other end links to each other with pulse output end PULSE1.
Further, the end that described input resistance R1 links to each other with input resistance R2 also is connected with filter capacitor C1, and the other end of filter capacitor C1 links to each other with pulse negative input end PULSE-, and input resistance R1 and filter capacitor C1 form low-pass filter circuit.
Further, described input resistance R1 resistance is chosen 1k, and filter capacitor C1 capacitance is chosen 0.001 mF.
Further, also comprise the mu balanced circuit that is used to provide the 2.7V reference voltage, mu balanced circuit comprises voltage stabilizing diode D4 and resistance R 5, voltage stabilizing diode D4 anode links to each other with the zero potential reference edge, voltage stabilizing diode D4 negative electrode links to each other with comparer LM1191 negative input end and links to each other with resistance R 5 one ends, and resistance R 5 other ends link to each other with comparer LM1191 power end.
Further, described voltage stabilizing diode D4 also is parallel with a filter capacitor C2.
Further, the power end of described comparer LM1191 links to each other with+5V power end, and the earth terminal of comparer LM1191 links to each other with the zero potential reference edge, and the output terminal of comparer LM1191 also links to each other with+5V power end by a pull-up resistor R4.
Further, described+5V power end also links to each other with the zero potential reference edge by a filter capacitor C3.
Further, described pulse negative input end is by a magnetic bead BEAD who is used to suppress outside ground wire impulse disturbances, and magnetic bead BEAD one end links to each other with pulse negative input end and external ground end, and the other end links to each other with the zero potential reference edge.
Further, described magnetic bead BEAD parameter is 1000 Europe/100MHZ, and current-carrying capacity is 0.5A.
Compared with prior art, the beneficial effects of the utility model are: by sluggishness relatively, make the recurrent interval measure precise and high efficiency; Multistage interference protection measure is set, effectively removes various interference, signal stabilization is accurate; Circuit structure is reasonable, and cost is low and raising measuring accuracy effect is obvious.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Fig. 2 is not for there being the sluggish relatively oscillogram of output.
Fig. 3 is an output waveform figure of the present utility model.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and Examples:
With reference to shown in Figure 1, the input circuit of recurrent interval measuring system, comprise pulse positive input terminal PULSE+, pulse negative input end PULSE-and pulse output end PULSE1, pulse positive input terminal PULSE+ links to each other with pulse output end PULSE1 by hysteresis comparator circuit, and pulse negative input end PULSE-links to each other with the zero potential reference edge.
Hysteresis comparator circuit comprises input resistance R1, input resistance R2, feedback resistance R3 and comparer LM1191, input resistance R1 links to each other with pulse positive input terminal PULSE+ with input resistance R2 series connection back one end, the other end links to each other with comparer LM1191 positive input terminal, feedback resistance R3 one end links to each other with comparer LM1191 positive input terminal, and the other end links to each other with pulse output end PULSE1.
For preventing the input interference, the end that input resistance R1 links to each other with input resistance R2 also is connected with filter capacitor C1, and the other end of filter capacitor C1 links to each other with pulse negative input end PULSE-, and input resistance R1 and filter capacitor C1 form low-pass filter circuit.In the present embodiment, input resistance R1 resistance is chosen 1k, and filter capacitor C1 capacitance is chosen 0.001 mF.
Also comprise the mu balanced circuit that is used to provide the 2.7V reference voltage, mu balanced circuit comprises voltage stabilizing diode D4 and resistance R 5, voltage stabilizing diode D4 anode links to each other with the zero potential reference edge, voltage stabilizing diode D4 negative electrode links to each other with comparer LM1191 negative input end and links to each other with resistance R 5 one ends, and resistance R 5 other ends link to each other with comparer LM1191 power end.
For further improving reference voltage stability, voltage stabilizing diode D4 also is parallel with a filter capacitor C2.
The power end of comparer LM1191 links to each other with+5V power end, and the earth terminal of comparer LM1191 links to each other with the zero potential reference edge, and the output terminal of comparer LM1191 also links to each other with+5V power end by a pull-up resistor R4.For making the comparer power supply stable ,+5V power end also links to each other with the zero potential reference edge by a filter capacitor C3.
The pulse negative input end is by a magnetic bead BEAD who is used to suppress outside ground wire impulse disturbances, and magnetic bead BEAD one end links to each other with pulse negative input end and external ground end, and the other end links to each other with the zero potential reference edge.In the present embodiment, magnetic bead BEAD parameter is 1000 Europe/100MHZ, and current-carrying capacity is 0.5A.
Principle of work of the present utility model: for the time interval microprocessor of measuring between the pulse signal needs the rising edge (negative edge) of monitoring pulse signal in real time, measure the recurrent interval by the time difference of calculating two rising edges (negative edge), the present invention mainly solves the level detection and the Anti-interference Design of external pulse input signal.This system comprises two parts composition: impulse level testing circuit and anti-interference process circuit.
Impulse level detects: as shown in Figure 1, pulse signal to be measured is introduced comparer LM119 positive input terminal by twisted-pair feeder anode PULSE+, comparer LM119 negative input end PULSE--connects 2.7 volts of the reference voltages that are made of resistance R 5 and stabilivolt D4, when pulse signal is high level (5v), comparer output high level; Comparer is output as low level during low level (0v).The output PLUS1 of comparer is connected to the AD input end of microprocessor, and recurrent interval calculating is finished by microprocessor.
The anti-interference process circuit comprises magnetic bead, R1C1 low-pass filter and comparator hysteresis feedback R3.Magnetic bead BEAD parameter is 1000 Europe/100MHZ, and it can effectively isolate the influence of pulse input circuit ground wire interference to native system; Low-pass filter circuit adopts resistance R 1=1k and capacitor C 1=0.001 microfarad (mF) to constitute low-pass filter, is f=160khz by frequency, removes the high frequency interference in the pulse signal; Comparer LM119, resistance R 1, R2 and R3 constitute hysteresis comparator, hysteresis comparator Upper threshold
, Lower Threshold
With the thresholding width be
(known comparer high level output
, low level
).Owing to can make comparer output produce the short term oscillation phenomenon during pulse change to be measured, to such an extent as to can't accurately estimate the initial or termination time of pulse; In addition, even pulse signal to be measured is constant, because the existence of noise also can make comparer output present of short duration level variation phenomenon, this can make system produce erroneous judgement, as shown in Figure 2.At these phenomenons, the present invention has introduced the vibration or the misoperation of hysteresis comparator minimizing output signal, as shown in Figure 3.
Theoretical analysis and practice show, ringing and other interference comparer false level that cause of this method when effectively suppressor pulse changes changes, and improves the recurrent interval accuracy of detection.
Though the utility model illustrates and describes by the reference preferred embodiment, but those of ordinary skills should understand, and can be not limited to the description of the foregoing description, in the scope of claims, can do the various variations on form and the details.
Claims (10)
1. the input circuit of recurrent interval measuring system, comprise pulse positive input terminal (PULSE+), pulse negative input end (PULSE-) and pulse output end (PULSE1), it is characterized in that: pulse positive input terminal (PULSE+) links to each other with pulse output end (PULSE1) by hysteresis comparator circuit, and pulse negative input end (PULSE-) links to each other with the zero potential reference edge.
2. the input circuit of recurrent interval measuring system according to claim 1, it is characterized in that: described hysteresis comparator circuit comprises input resistance R1, input resistance R2, feedback resistance (R3) and comparer (LM1191), input resistance R1 links to each other with pulse positive input terminal (PULSE+) with input resistance R2 series connection back one end, the other end links to each other with comparer (LM1191) positive input terminal, feedback resistance (R3) end links to each other with comparer (LM1191) positive input terminal, and the other end links to each other with pulse output end (PULSE1).
3. the input circuit of recurrent interval measuring system according to claim 2, it is characterized in that: the end that described input resistance R1 links to each other with input resistance R2 also is connected with filter capacitor (C1), the other end of filter capacitor (C1) links to each other with pulse negative input end (PULSE-), and input resistance R1 and filter capacitor (C1) are formed low-pass filter circuit.
4. the input circuit of recurrent interval measuring system according to claim 3 is characterized in that: described input resistance R1 resistance is chosen 1k, and filter capacitor (C1) capacitance is chosen 0.001 mF.
5. the input circuit of recurrent interval measuring system according to claim 2, it is characterized in that: also comprise the mu balanced circuit that is used to provide the 2.7V reference voltage, mu balanced circuit comprises voltage stabilizing diode (D4) and resistance (R5), voltage stabilizing diode (D4) anode links to each other with the zero potential reference edge, voltage stabilizing diode (D4) negative electrode links to each other with comparer (LM1191) negative input end and links to each other with resistance (R5) end, and resistance (R5) other end links to each other with comparer (LM1191) power end.
6. the input circuit of recurrent interval measuring system according to claim 5 is characterized in that: described voltage stabilizing diode (D4) also is parallel with a filter capacitor (C2).
7. the input circuit of recurrent interval measuring system according to claim 5, it is characterized in that: the power end of described comparer (LM1191) links to each other with+5V power end, the earth terminal of comparer (LM1191) links to each other with the zero potential reference edge, and the output terminal of comparer (LM1191) also links to each other with+5V power end by a pull-up resistor (R4).
8. the input circuit of recurrent interval measuring system according to claim 7 is characterized in that: described+5V power end also links to each other with the zero potential reference edge by a filter capacitor (C3).
9. the input circuit of recurrent interval measuring system according to claim 1, it is characterized in that: described pulse negative input end is by a magnetic bead (BEAD) that is used to suppress outside ground wire impulse disturbances, magnetic bead (BEAD) end links to each other with pulse negative input end and external ground end, and the other end links to each other with the zero potential reference edge.
10. the input circuit of recurrent interval measuring system according to claim 9 is characterized in that: described magnetic bead (BEAD) parameter is 1000 Europe/100MHZ, and current-carrying capacity is 0.5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320047276 CN203101851U (en) | 2013-01-29 | 2013-01-29 | Input circuit of pulse interval measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320047276 CN203101851U (en) | 2013-01-29 | 2013-01-29 | Input circuit of pulse interval measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203101851U true CN203101851U (en) | 2013-07-31 |
Family
ID=48853236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320047276 Expired - Fee Related CN203101851U (en) | 2013-01-29 | 2013-01-29 | Input circuit of pulse interval measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203101851U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110673532A (en) * | 2019-10-31 | 2020-01-10 | 重庆凯瑞汽车试验设备开发有限公司 | Pulse signal processing and collecting device |
| CN111830816A (en) * | 2020-06-28 | 2020-10-27 | 南京天朗防务科技有限公司 | Self-adaptive timing method and device |
-
2013
- 2013-01-29 CN CN 201320047276 patent/CN203101851U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110673532A (en) * | 2019-10-31 | 2020-01-10 | 重庆凯瑞汽车试验设备开发有限公司 | Pulse signal processing and collecting device |
| CN110673532B (en) * | 2019-10-31 | 2020-08-04 | 重庆凯瑞汽车试验设备开发有限公司 | Pulse signal processing and collecting device |
| CN111830816A (en) * | 2020-06-28 | 2020-10-27 | 南京天朗防务科技有限公司 | Self-adaptive timing method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203595907U (en) | Anti-interference type input circuit of pulse interval measurement system | |
| CN106249186A (en) | The bearing calibration of a kind of battery management system diverter current acquisition data and device | |
| CN203101851U (en) | Input circuit of pulse interval measuring system | |
| CN204964613U (en) | Zero -cross detection circuit | |
| CN108170630B (en) | Serial port communication baud rate self-adaption method, system and equipment | |
| CN203502448U (en) | Simple signal wave generator | |
| CN203376374U (en) | Voltage sensing module based on photoelectric couplers | |
| CN102130682B (en) | Phase discriminator | |
| CN103532528A (en) | Pulse time discrimination device | |
| CN106680575B (en) | Voltage jump detection circuit and method | |
| CN104569610A (en) | Measuring circuit of micro differential capacitor | |
| CN203658463U (en) | Digital frequency meter based on DSP | |
| CN114323196A (en) | Aviation fuel quantity sensor measuring circuit and method based on window waveform interception | |
| CN205193056U (en) | Water quality testing circuit based on three -terminal voltage regulator tube steady voltage design | |
| CN108227541B (en) | Discontinuous analog differential signal frequency and phase acquisition method | |
| CN107395165A (en) | A kind of liquid level gauge echo time collection peak detection circuit | |
| CN203629624U (en) | Zero-passage comparison circuit for ultrasonic flowmeters | |
| CN203761365U (en) | Power frequency measuring signal conversion circuit | |
| CN203827314U (en) | Contact input interface circuit | |
| CN204740578U (en) | Automatic adjust mutual capacitive touch panel of response window width | |
| CN210578436U (en) | Wide-temperature high-precision high-amplitude limiting module | |
| CN219085015U (en) | Micro-current detection circuit | |
| CN220043399U (en) | Comparison detection circuit | |
| CN202906862U (en) | A vehicle rotating speed signal analyzing circuit | |
| CN108957103B (en) | High-precision peak detection method for high-bandwidth small signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20140129 |