CN103807485A - Radio frequency awakening circuit of wireless electromagnetic valve - Google Patents
Radio frequency awakening circuit of wireless electromagnetic valve Download PDFInfo
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- CN103807485A CN103807485A CN201410053870.5A CN201410053870A CN103807485A CN 103807485 A CN103807485 A CN 103807485A CN 201410053870 A CN201410053870 A CN 201410053870A CN 103807485 A CN103807485 A CN 103807485A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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Abstract
The invention provides a radio frequency awakening circuit of a wireless electromagnetic valve. The radio frequency awakening circuit comprises an SAW filtering and impedance matching circuit, an envelope detection and voltage doubling circuit, a signal amplification circuit, a signal selection and boosted circuit, a signal shaping circuit, a microprocessor, a wireless receiving and transmitting unit and a valve control unit. The SAW filtering and impedance matching circuit, the envelope detection and voltage doubling circuit, the signal amplification circuit, the signal selection and boosted circuit and the signal shaping circuit are sequentially connected with the microprocessor, a microcontroller is connected with the signal amplification circuit, and the wireless receiving and transmitting unit and the valve control unit are respectively connected with the microcontroller. The hardware awakening circuit is adopted, the defects of an existing wireless electromagnetic valve node awakening mechanism are overcome, energy management efficiency is improved, the service life of batteries is prolonged, and meanwhile the radio frequency awakening circuit is high in antijamming capacity, good in stability and wide in application range.
Description
Technical field
The present invention relates to agricultural irrigation technical field of automation, be specifically related to a kind of radio-frequency wakeup circuit of wireless magnet valve.
Background technique
At present, along with the continuous rising of growing tension and the irrigation cost of China's freshwater resources, the automatic irrigating control system with water saving, the advantage such as efficient is widely used.But, along with the raising of irrigation scale and irrigation precision, as the solenoid valve quantity of the main actuating equipment of irrigation control also in quick increase, certainly will need to lay a large amount of cables, this not only brings difficulty to system installation, maintenance and expansion, also to have affected field farming, in order addressing these problems, conventionally adopt at present wireless magnet valve mode to address these problems simultaneously.
Because agricultural production cycle is long, need wireless magnet valve node to there is low power consumption and could meet usage requirement.For reducing power consumption, extend battery service life, must guarantee that the solenoid valve most of the time, in dormancy or off-position, so just need make it return to working state by certain arouse machine processed.At present, the most widely used wake-up mode mainly contains two kinds: (1) timing wake-up mode: timing wake-up adopts intermittent duty, chip internal provides clock pulse, at a certain time interval processor is waken up, after waking up, processor carries out event detection, if the event of detecting, processes, if the event of can't detect enters state of dormancy again.The advantage of timing wake-up mode is that radio-frequency module is simple, and without the extra circuit that adds, cost is low; Shortcoming is that power consumption is large, and response timeliness is low.(2) hardware module is waken up: adopt independently super low-power consumption receiving machine, this receiving machine wakes solenoid valve node up in the situation that receiving valid wireless electric wave, this method reaction velocity is fast, but cost is high, as: the super low-power consumption receiver chip ATA5283 of Atmel company is applicable to such application.
Summary of the invention
Technical problem to be solved by this invention is: a large amount of cables are laid in field, makes installation, the maintenance and expansion inconvenience of system, affects field farming problem simultaneously; Existing solenoid valve timing wake-up mode power consumption is large, and response timeliness is low, and the problem of hardware module wake-up mode high cost.
For solving the problems of the technologies described above, the present invention proposes a kind of radio-frequency wakeup circuit of wireless magnet valve, comprising:
SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit, microprocessor, wireless transmit/receive units and valve control unit;
Described SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit and microprocessor are connected successively; Described microcontroller is connected with described signal amplification circuit; Described wireless transmit/receive units is connected with described microcontroller respectively with valve control unit;
SAW filtering and impedance matching circuit, for carrying out filtering and impedence matching to the control signal receiving;
Envelope detection and voltage-multiplying circuit, for to after filtering, the control signal of impedence matching carries out detection and amplification;
Signal amplification circuit, carries out signal amplification for the control signal to after detection;
Signal is selected and booster circuit, for selecting satisfactory control signal;
Signal transformation circuit, for the control signal that described signal is selected and booster circuit is selected is carried out to shaping, generates low and high level signal;
Wireless transmit/receive units, carries out radio communication for microprocessor and base station or control centre;
Valve control unit, for controlling the break-make of wireless magnet valve;
Microprocessor, for carrying out radio communication with base station or control centre, and controls valve control unit according to the control signal receiving; Also control for the gain to described signal amplification circuit.
Preferably, described SAW filtering and impedance matching circuit comprise input impedance matching circuit, SAW eliminator and output impedance match circuit.
Preferably, described envelope detection and voltage-multiplying circuit comprise first order voltage doubling rectifying circuit and second level voltage doubling rectifying circuit;
First order voltage doubling rectifying circuit, for to after filtering, the control signal of impedence matching carries out envelope detection;
Second level voltage doubling rectifying circuit, for the direct current biasing as the second level according to the VDC of first order voltage doubling rectifying circuit generation, increases signal intensity by changing earth potential.
Preferably, described first order voltage doubling rectifying circuit comprises DC bias circuit and peak-detector circuit.
Preferably, described signal amplification circuit comprises gain control circuit and amplification circuit;
Gain control circuit, for regulating the magnification factor of amplification circuit under the control of described microprocessor;
Amplification circuit, for the amplification of signal.
The frequency of the control signal that preferably, described signal selection and booster circuit are selected is not less than 2KHZ.
Preferably, described signal transformation circuit comprises this schmitt trigger chip and electric capacity, the input pin of described chip selects with described signal and booster circuit is connected, the output pin of described chip is connected with described microprocessor, described electric capacity one end is connected with the power pins of described chip, the other end ground connection.
Preferably, the radio-frequency wakeup circuit of described wireless magnet valve also comprises power circuit, in working order time, for each several part circuit provides operating voltage.
The radio-frequency wakeup circuit of a kind of wireless magnet valve that the present invention proposes, adopt hardware wake-up circuit, can significantly reduce the use of power consumption prolongation wireless magnet valve battery with respect to timing wake-up circuit, hardware wake-up circuit itself consumes extremely low energy, improve energy management efficiency, gain and control and signal selecting circuit design by employing, make wireless magnet valve wake-up circuit antijamming capability strong, good stability, wide accommodation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1: the schematic diagram that is the radio-frequency wakeup circuit of a kind of wireless magnet valve of the present invention;
Fig. 2: the circuit diagram that is SAW filtering and impedance matching circuit in the embodiment of the present invention;
Fig. 3: the circuit diagram that is envelope detection and voltage-multiplying circuit in the embodiment of the present invention;
Fig. 4: the circuit diagram that is signal amplification circuit in the embodiment of the present invention;
Fig. 5: be that in the embodiment of the present invention, signal is selected and the circuit diagram of booster circuit;
Fig. 6: the circuit diagram that is signal transformation circuit in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obvious described embodiment is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
The present invention proposes a kind of radio-frequency wakeup circuit of wireless magnet valve, as shown in Figure 1, comprising: SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit, microprocessor, wireless transmit/receive units and valve control unit;
Described SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit and microprocessor are connected successively; Described microcontroller is connected with described signal amplification circuit; Described wireless transmit/receive units is connected with described microcontroller respectively with valve control unit;
SAW filtering and impedance matching circuit, for carrying out filtering and impedence matching to the control signal receiving;
Envelope detection and voltage-multiplying circuit, for to after filtering, the control signal of impedence matching carries out detection and amplification;
Signal amplification circuit, carries out signal amplification for the control signal to after detection;
Signal is selected and booster circuit, for selecting satisfactory control signal;
Signal transformation circuit, for the control signal that described signal is selected and booster circuit is selected is carried out to shaping, generates low and high level signal;
Wireless transmit/receive units, carries out radio communication for microprocessor and base station or control centre;
Valve control unit, for controlling the break-make of wireless magnet valve;
Microprocessor, for carrying out radio communication with base station or control centre, and controls valve control unit according to the control signal receiving; Also control for the gain to described signal amplification circuit.
Preferably, described SAW filtering and impedance matching circuit, as shown in Figure 2, comprise input impedance matching circuit, SAW eliminator and output impedance match circuit.
SAW filtering and impedance matching circuit are made up of input impedance matching circuit, chip U1 and output impedance match circuit, for filtering interference signals, strengthen the gated nature of signal.Input impedance matching circuit is made up of inductance L 1, inductance L 2, capacitor C 1 and capacitor C 2, be placed on the signal input part of U1, output impedance match circuit is made up of inductance L 3, inductance L 4, capacitor C 3 and capacitor C 4, is placed on the signal output part of U1, and U1 adopts SAW filter chip B3760.Resistance R 1, capacitor C 5, capacitor C 6, inductance L 1, inductance L 6 and capacitor C 7, capacitor C 8 form impedance matching network, for realizing the impedance transformation of antenna output impedance to envelope detection and voltage-multiplying circuit input resistance, by selecting suitable components and parts value, reach good impedence matching, reduce power loss and increase voltage gain.
Preferably, described envelope detection and voltage-multiplying circuit, as shown in Figure 3, comprise first order voltage doubling rectifying circuit and second level voltage doubling rectifying circuit;
First order voltage doubling rectifying circuit, for to after filtering, the control signal of impedence matching carries out envelope detection;
Second level voltage doubling rectifying circuit, for the direct current biasing as the second level according to the VDC of first order voltage doubling rectifying circuit generation, increases signal intensity by changing earth potential.
Preferably, described first order voltage doubling rectifying circuit comprises DC bias circuit and peak-detector circuit.
Envelope detection and voltage-multiplying circuit, it is made up of the basic voltage doubling rectifying circuit of two-stage, for the radio-frequency voltage that is input to envelope detection and voltage-multiplying circuit is carried out to detection and amplification.Capacitor C 10, capacitor C 11 and diode D1, diode D2 composition first order voltage doubling rectifying circuit, diode D1, D2 are for ensureing the one-way flow of electric current, capacitor C 10 plays the effect of stopping direct current and stored charge, and capacitor C 11 plays the effect of output filtering and stored charge.C10 and D1 are DC bias circuit in essence, and C11 and D2 are peak-detector circuit.The VDC that second level voltage doubling rectifying circuit produces using first order voltage doubling rectifying circuit is as the direct current biasing of the second level, reach by changing the earth potential of the second level object that increases signal intensity, wherein capacitor C 9, capacitor C 12 and diode D3, diode D4 Placement and the effect in the basic voltage doubling rectifying circuit in the second level is similar to capacitor C 10, capacitor C 11 and diode D1, diode D2.
Preferably, described signal amplification circuit, as shown in Figure 4, comprises gain control circuit and amplification circuit;
Gain control circuit, for regulating the magnification factor of amplification circuit under the control of described microprocessor;
Amplification circuit, for the amplification of signal.
Generally, the signal of base station radiation is strong and weak different, after envelope detection and voltage-multiplying circuit, is difficult to obtain desirable signal.Amplification circuit is that unsettled signal intensity small-signal V12 is further amplified, to meet next step signal processing requirement.Chip U3 adopts integrated amplifier OPA333, and capacitor C 13, capacitor C 14 are placed near U3 power pins position, play the effect of filtering.Resistance R 3 and capacitor C 15 form low-pass filter, to the further filtering of input signal V12.In gain control circuit, U2 adopts Digital Programmable potentiometer CAT5120, its power pins (VDD) is connected with VCC, ground pin (GND) with power supply be connected, pin UP, CS are connected with pin P2, the P1 of microprocessor respectively, and another two pins are connected with 4 pin with 3 pin of chip U3 respectively.In the time that the signal of V12 is smaller, under the control of microprocessor, by increasing the output resistance of U2, improve the magnification factor of amplification circuit, make the output voltage of amplifier become large; In the time that the signal of V12 is larger, under the control of microprocessor, by reducing the output resistance of U2, reduce the magnification factor of amplification circuit, the output voltage of amplifier is diminished; Therefore, under the control of microprocessor, make signal V13 remain at certain ideal value, increased the adaptability of whole circuit to signal.
The frequency of the control signal that preferably, described signal selection and booster circuit are selected is not less than 2KHZ.
Signal is selected and booster circuit, as shown in Figure 5, when the 3 pin voltages of comparator chip U4 are during higher than 4 pin voltage, comparator output high level, capacitor C 19, C20 charging; When the 3 pin voltages of comparator chip U4 are during lower than 4 pin voltage, comparator output low level, C19 is by diode D5 repid discharge, and C20 discharges at a slow speed by resistance R 6.In the time that V13 signal frequency is lower, the speed of comparator output low and high level is slower, and capacitor C 19, capacitor C 20 can both be discharged completely, and the magnitude of voltage of V14 is lower.In the time that the frequency of V13 signal is higher, the speed of comparator output low and high level is very fast, and capacitor C 20 has not also been discharged and once more charged, therefore, the voltage at capacitor C 20 two ends increases gradually, finally makes the magnitude of voltage of V14 be enough to make shaping circuit output high level.Show by test, in the time that signal frequency reaches 2KHZ, the magnitude of voltage of V14 reaches 0.66VCC, can make shaping circuit output high level.Therefore, this circuit, to play the effect of shielding lower than the signal of 2KHZ, greatly reduces the interference of low frequency signal.
Preferably, described signal transformation circuit, as shown in Figure 6, comprise this schmitt trigger chip and electric capacity, the input pin of described chip selects with described signal and booster circuit is connected, the output pin of described chip is connected with described microprocessor, and described electric capacity one end is connected with the power pins of described chip, the other end ground connection.
Signal transformation circuit is to be made up of scmitt trigger circuit chip 74HC14 and capacitor C 22, and capacitor C 22 plays the effect of power filter.Its effect is that V14 signal is further processed, and the high and low level signal of output rule, for waking microprocessor up, avoids the microprocessor error causing because signal is irregular to wake up, has reduced the power consumption of circuit.
Preferably, the radio-frequency wakeup circuit of described wireless magnet valve also comprises power circuit, in working order time, for each several part circuit provides operating voltage.
The embodiment of the present invention fully takes into account the actual operation requirements of wireless magnet valve in field irrigation, must guarantee that wireless magnet valve node has the feature of low power consumption, meets actual need of production.
The radio-frequency wakeup circuit of a kind of wireless magnet valve that the present invention proposes, adopt hardware wake-up circuit, can significantly reduce the use of power consumption prolongation wireless magnet valve battery with respect to timing wake-up circuit, hardware wake-up circuit itself consumes extremely low energy, improve energy management efficiency, gain and control and signal selecting circuit design by employing, make wireless magnet valve wake-up circuit antijamming capability strong, good stability, wide accommodation.
Above embodiment is only non-limiting in order to technological scheme of the present invention to be described, only with reference to preferred embodiment, the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can modify or be equal to replacement technological scheme of the present invention, and do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. the radio-frequency wakeup circuit of a wireless magnet valve, it is characterized in that, comprise SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit, microprocessor, wireless transmit/receive units and valve control unit, described SAW filtering and impedance matching circuit, envelope detection and voltage-multiplying circuit, signal amplification circuit, signal selection and booster circuit, signal transformation circuit and microprocessor are connected successively; Described microcontroller is connected with described signal amplification circuit; Described wireless transmit/receive units is connected with described microcontroller respectively with valve control unit;
SAW filtering and impedance matching circuit, for carrying out filtering and impedence matching to the control signal receiving;
Envelope detection and voltage-multiplying circuit, for to after filtering, the control signal of impedence matching carries out detection and amplification;
Signal amplification circuit, carries out signal amplification for the control signal to after detection;
Signal is selected and booster circuit, for selecting satisfactory control signal;
Signal transformation circuit, for the control signal that described signal is selected and booster circuit is selected is carried out to shaping, generates low and high level signal;
Wireless transmit/receive units, carries out radio communication for microprocessor and base station or control centre;
Valve control unit, for controlling the break-make of wireless magnet valve;
Microprocessor, for carrying out radio communication with base station or control centre, and controls valve control unit according to the control signal receiving; Also control for the gain to described signal amplification circuit.
2. circuit according to claim 1, is characterized in that, described SAW filtering and impedance matching circuit comprise input impedance matching circuit, SAW eliminator and output impedance match circuit.
3. circuit according to claim 1, is characterized in that, described envelope detection and voltage-multiplying circuit comprise first order voltage doubling rectifying circuit and second level voltage doubling rectifying circuit;
First order voltage doubling rectifying circuit, for to after filtering, the control signal of impedence matching carries out envelope detection;
Second level voltage doubling rectifying circuit, for the direct current biasing as the second level according to the VDC of first order voltage doubling rectifying circuit generation, increases signal intensity by changing earth potential.
4. circuit according to claim 3, is characterized in that, described first order voltage doubling rectifying circuit comprises DC bias circuit and peak-detector circuit.
5. circuit according to claim 1, is characterized in that, described signal amplification circuit comprises gain control circuit and amplification circuit;
Gain control circuit, for regulating the magnification factor of amplification circuit under the control of described microprocessor;
Amplification circuit, for the amplification of signal.
6. circuit according to claim 1, is characterized in that, described signal is selected and the frequency of the control signal that booster circuit is selected is not less than 2KHZ.
7. circuit according to claim 1, it is characterized in that, described signal transformation circuit comprises this schmitt trigger chip and electric capacity, the input pin of described chip selects with described signal and booster circuit is connected, the output pin of described chip is connected with described microprocessor, described electric capacity one end is connected with the power pins of described chip, the other end ground connection.
8. according to the circuit described in claim 1-7, it is characterized in that, described circuit also comprises power circuit, in working order time, for each several part circuit provides operating voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053870.5A CN103807485B (en) | 2014-02-17 | 2014-02-17 | A kind of radio-frequency wakeup circuit of wireless magnet valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410053870.5A CN103807485B (en) | 2014-02-17 | 2014-02-17 | A kind of radio-frequency wakeup circuit of wireless magnet valve |
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| CN103807485A true CN103807485A (en) | 2014-05-21 |
| CN103807485B CN103807485B (en) | 2016-02-10 |
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| CN201410053870.5A Active CN103807485B (en) | 2014-02-17 | 2014-02-17 | A kind of radio-frequency wakeup circuit of wireless magnet valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759682A (en) * | 2016-02-03 | 2016-07-13 | 深圳市有方科技股份有限公司 | Wireless wakeup system and method, controller and controlled device |
| CN116996081A (en) * | 2023-09-26 | 2023-11-03 | 中国科学技术大学 | In-band interference suppression wake-up receiver radio frequency circuit |
| CN116996080A (en) * | 2023-09-26 | 2023-11-03 | 中国科学技术大学 | Radio frequency circuit of wake-up receiver |
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| CN202795422U (en) * | 2012-04-28 | 2013-03-13 | 复旦大学无锡研究院 | Radio-frequency wake-up circuit for active RFID electronic tags |
| CN203363369U (en) * | 2013-08-06 | 2013-12-25 | 衢州昀睿工业设计有限公司 | Drive circuit of four-state electromagnetic valve |
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| US4948090A (en) * | 1989-09-27 | 1990-08-14 | Chen Chge San | Induction type automatic-controlled fluid faucet |
| CN201111118Y (en) * | 2007-06-15 | 2008-09-03 | 深圳市金溢科技有限公司 | Double-wake-up double-frequency composite traffic card for recognizing ambiguity path |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759682A (en) * | 2016-02-03 | 2016-07-13 | 深圳市有方科技股份有限公司 | Wireless wakeup system and method, controller and controlled device |
| CN116996081A (en) * | 2023-09-26 | 2023-11-03 | 中国科学技术大学 | In-band interference suppression wake-up receiver radio frequency circuit |
| CN116996080A (en) * | 2023-09-26 | 2023-11-03 | 中国科学技术大学 | Radio frequency circuit of wake-up receiver |
| CN116996081B (en) * | 2023-09-26 | 2023-12-05 | 中国科学技术大学 | In-band interference suppression wake-up receiver radio frequency circuit |
| CN116996080B (en) * | 2023-09-26 | 2023-12-05 | 中国科学技术大学 | Radio frequency circuit of wake-up receiver |
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| CN103807485B (en) | 2016-02-10 |
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