CN102901523A - Micropower wireless acquisition and measurement device based on electricity taking from current loop and implementation method of device - Google Patents
Micropower wireless acquisition and measurement device based on electricity taking from current loop and implementation method of device Download PDFInfo
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- CN102901523A CN102901523A CN201210333673XA CN201210333673A CN102901523A CN 102901523 A CN102901523 A CN 102901523A CN 201210333673X A CN201210333673X A CN 201210333673XA CN 201210333673 A CN201210333673 A CN 201210333673A CN 102901523 A CN102901523 A CN 102901523A
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Abstract
The invention belongs to the field of data acquisition and measurement of measurement systems, and relates to a micropower wireless acquisition and measurement device based on electricity taking from a current loop and an implementation method of the micropower wireless acquisition and measurement device. The implementation method is characterized in that the electricity of the current loop is taken as a power supply of the micropower wireless acquisition and measurement device; after acquiring the power, the micropower wireless acquisition and measurement device starts working, the current analog quantity of the current loop is converted into digital quantity by virtue of A/D (Analog-to-Digital) conversion, and then the digital quantity is transmitted to a master data acquisition station in a wireless way after being processed by a MCU (Microprogrammed Control Unit). According to the micropower wireless acquisition and measurement device and the implementation method, the way of taking the electricity from the current loop and the way of wireless transmission are combined, and a user can acquire and measure remote data without additional power wires and communication wires.
Description
Technical field
The present invention relates to device and its implementation of data acquisition fields of measurement, be specifically related to micropower wireless collection measurement mechanism and its implementation of a kind of electric current loop power taking.
Background technology
The sensors such as humidity, pressure, flow adopt the mode of 4 ~ 20mA electric current loop to export measurement result mostly at present, convert in the process of digital quantity in the current analog amount with 4 ~ 20mA electric current loop, often need to install additional extra A/D conversion and gather measurement mechanism, after the A/D conversion with the formal output of digital signal.But gathering measurement mechanism, the A/D that installs additional conversion have two places may relate to wiring: Power supply and digital signal output.Field wiring has increased difficulty of construction, executive cost and engineering time.Present existing collection measuring equipment can be realized the data wireless transmission, but still needs external power supply aspect Power supply.So just increased construction cost, difficulty of construction and engineering time, be unfavorable for gathering measuring equipment and realize the data wireless transmission.
Along with low-power consumption, have the appearance of the wireless and low-power consumption MCU of the micropower of sleep mode, make us utilize the micropower electric energy of electric current loop to realize that as the power supply of micropower wireless collection measurement mechanism signals collecting is measured and wireless transmission becomes possibility.The output area of electric current loop is 4 ~ 20mA, and electric current loop can be at least power supply of 4mA of micropower wireless collection measurement mechanism.Micropower wireless collection measurement mechanism total current between rest period can be accomplished less than 100uA, comprises that in normal work period the maximum total current of wireless receiving and dispatching is generally below 70mA.Press sleep interval 4S, wake rear work 0.2S up and calculate, its average working current is:
I=W/t=(0.1mA×3.8S+70mA×0.2S)/4S=3.595mA；
Therefore after adopting the electric current loop power supply, can satisfy acquisition interval greater than 4 seconds acquisition applications, 4 seconds acquisition interval can satisfy most on-site data gathering.This also for we realize exempting from wiring carry out that the field data timing acquiring provides may.
Summary of the invention
For the deficiencies in the prior art, the invention provides micropower wireless collection measurement mechanism and its implementation of a kind of electric current loop power taking, solve the Power supply problem by the electric current loop power taking, be aided with again micro power radio module and pass through wireless way for transmitting data, Power supply and digital signal export two aspect the realization scene exempt from wiring, reduce difficulty of construction, save executive cost and engineering time.
The objective of the invention is to adopt following technical proposals to realize:
A kind of micropower wireless collection measurement mechanism of electric current loop power taking, its improvements are that described measurement mechanism comprises:
Electric current loop commutation circuit: be used for control electric current loop sample circuit the electric current of electric current loop is taken a sample;
Super capacitor: the electric charge when being used for storing described electric current loop and being described measurement mechanism power supply;
Electric voltage observation circuit: described measurement mechanism is carried out voltage monitoring;
The electric current loop sample circuit: the electric current to electric current loop is taken a sample;
Mu balanced circuit: be used for carrying out voltage stabilizing for the supply voltage of control module MCU;
Micro-control unit MCU: be used for the control A/D converter to sampling and the Wireless Data Transmission of electric current loop electric current;
Wireless module: the electric current loop current data of micro-control unit MCU output is sent to the data acquisition main website.
Wherein, described electric current loop commutation circuit is connected with super capacitor, electric voltage observation circuit and electric current loop sample circuit respectively; Described mu balanced circuit is connected with super capacitor, electric voltage observation circuit and micro-control unit MCU respectively; Described micro-control unit MCU is connected with wireless module; The electric current of electric current loop is inputted as described electric current loop commutation circuit.
Wherein, described electric current loop commutation circuit comprises electronic switch S1 and S2; Described electric current loop sample circuit comprises resistance R 1 and R2;
Described electronic switch S1, resistance R 1 and resistance R 2 are connected successively, form the S1-R1-R2 branch road; Described electronic switch S2 and super capacitor C1 connect successively, form the S2-C1 branch road; Described S1-R1-R2 branch road and S2-C1 branch circuit parallel connection; Described S1-R1-R2 branch road and the equal ground connection of S2-C1 branch road;
Input end at electronic switch S1 and S2 forms the I+ port; Input end in resistance R 2 forms the I-port; The voltage of resistance R 2 is reduced to Ui; The A/D converter of Ui access micro-control unit MCU, the size of the size reflection electric current loop electric current of Ui voltage.
Wherein, described electronic switch S1 and S2 adopt the power electronic devices metal-oxide-semiconductor to form; Described resistance R 1 and R2 are composed in series the pull-up resistor of electric current loop.
Wherein, the minimum discharge voltage range of described super capacitor C1 is between 3.6 ~ 3.9V; The maximum withstand voltage of described super capacitor C1 is 5V.
Wherein, described electric voltage observation circuit adopts the MAX6459 chip monitoring to carry out voltage monitoring; Described MAX6459 chip monitoring comprises the monitoring of two-way window voltage, and every road voltage monitoring mode is the window voltage monitoring, and window voltage is all set on every road, and window voltage comprises upper voltage limit U
TH+With lower voltage limit U
TH-Described MAX6459 chip monitoring comprises two output voltage, is respectively OUTA and OUTB.
Wherein, described mu balanced circuit adopts LTC1844 voltage stabilizing chip that the supply voltage of micro-control unit MCU is carried out voltage stabilizing; Described LTC1844 voltage stabilizing chip comprise IN pin, OUT pin,
Pin, BYP pin and GND pin;
V
INTermination enters the IN pin; At V
INTermination enters filter capacitor C2;
V
OUTTermination enters the OUT pin, at V
OUTTermination enters filter capacitor C3;
Shunt capacitance C4 access BYP pin;
The high low-voltage access of described electric voltage observation circuit output
Pin;
Described GND pin ground connection.
Wherein, described filter capacitor C2, C3 and the equal ground connection of C4; Described filter capacitor C2 and C3 are 1 μ F; Described shunt capacitance C4 is 0.1 μ F.
Wherein, described micro-control unit comprises A/D converter and serial ports; Described A/D converter is used for gathering the sampling voltage Ui of the sampled rear formation of electric current loop electric current and converting thereof into digital quantity, and the size of voltage U i has reflected the size of electric current loop electric current; Described serial ports outputs to wireless module with the electric current loop current value of conversion by serial ports.
Wherein, described micro-control unit comprises that employing is with micropower MCU chip; The MCU chip of described micropower comprises STM32F103, STM32F105, STM32F107, STM32F205, the STM32F207 series of ST, and the LPC12XX of NXP, LPC12XX series.
Wherein, described wireless module adopts the Zigbee digital transmission module; Described Zigbee digital transmission module comprises SZ05Zigbee digital transmission module, EM351Zigbee digital transmission module and EM357Zigbee digital transmission module.
The present invention is based on another purpose a kind of implementation method of micropower wireless collection measurement mechanism of electric current loop power taking be provided, its improvements in, described method comprises the steps:
The electric energy of A, electric current loop is described measurement mechanism power supply as power supply;
B, described electric current loop commutation circuit are controlled the current direction electric current loop sample circuit of electric current loop or are flowed to super capacitor C2 charging;
After taking a sample electric current loop, C, described electric current loop sample circuit transfer to the A/D converter of micro-control unit MCU;
The A/D converter of D, described micro-control unit MCU is converted to digital quantity with the current analog amount of electric current loop;
E, the digital quantity of described electric current loop is processed by micro-control unit MCU;
F, the electric current loop current data after will processing are transferred to wireless module by the serial ports of micro-control unit MCU;
G, described wireless module send to the data acquisition main website with the electric current loop current value wirelessly.
Wherein, among the described step B, current direction resistance R 1 and the R2 of electronic switch S1 control electric current loop carry out current sampling; Described electronic switch S2 control current direction super capacitor C1 charging;
When micro-control unit MCU did not sample to electric current loop, described electronic switch S1 disconnected; Electronic switch S2 is closed, the current direction super capacitor charging of electric current loop;
When MCU sampled to electric current loop, S1 was closed for micro-control unit MCU control electronic switch; Electronic switch S2 disconnects, and current direction resistance R 1 and the R2 of electric current loop carry out current sampling.
Wherein, among the described step C, the electric current of described electric current loop is from described I+ and the access of I-port, electronic switch S1 and resistance R 1 and R2 form current loop together, form voltage drop Ui at R2 behind the current flowing resistance R2 of described electric current loop, the A/D converter of described voltage drop Ui access micro-control unit MCU carries out the A/D conversion.
Wherein, during execution in step A-G, to the voltage of described measurement mechanism monitor again by described electric voltage observation circuit for described method.
Wherein, the input voltage when electric voltage observation circuit is lower than window voltage lower limit U
TH-The time, described OUTA output low level; When input voltage is higher than window voltage upper limit U
TH+The time, described OUTA output high level; When input voltage is lower than window voltage lower limit U
TH-The time, described OUTB output high level is when input voltage is higher than window voltage upper limit U
TH+The time, described OUTB output low level.
Wherein, when transferring to micro-control unit MCU behind the electric current of electric current loop sample circuit sample rate current ring, described mu balanced circuit carries out voltage stabilizing to the supply voltage of micro-control unit MCU.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, collection measurement mechanism provided by the invention makes the user can realize exempting from cable wiring manufacture when the collection measurement mechanism is installed by after taking electric current loop power taking and wireless transmission, has reduced difficulty of construction, has saved construction cost and engineering time.
2, solved the powerup issue that gathers measurement mechanism, can the user can be applied to provide power supply to have any problem can't provide even the local for a long time work of power supply.
3, solved the field wiring problem, made the user realizing exempting from wiring aspect Power supply and the data transmission two, reduced difficulty of construction, saved construction cost and engineering time.
4, owing to do not need extra field wiring and on-the-spot power supply, can arrange fast sensing network node, gather fast and collect all kinds of sensing datas with electric current loop output, reach the purpose of plug and play.
Description of drawings
Fig. 1 is the structural representation of the micropower wireless collection measurement mechanism of electric current loop power taking provided by the invention;
Fig. 2 is electric current loop sample circuit provided by the invention, super capacitor and electric current loop commutation circuit synoptic diagram;
Fig. 3 is voltage monitoring chip theory diagram provided by the invention;
Fig. 4 is voltage stabilizing chip theory diagram provided by the invention;
Fig. 5 is that micro-control unit MCU provided by the invention gathers and the data transmission synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The minimum current of electric current loop only has 4mA, and the running current of whole collection measurement mechanism can reach 70mA, and supply current and working current differ relatively great disparity.The large electric current of short time can cause very large impact to whole supply voltage, uses super capacitor to cushion and reduces this impact.Super capacitor can also between rest period the electrical power storage of affluence got up to satisfy wake up after the consumption of large electric current of short time.The power supply of little electric current also can't be satisfied micro-control unit MCU working current during the initialization behind just electrification reset, and the measure by in advance energy storage of super capacitor makes whole power supply can satisfy the electric power supply of micro-control unit MCU during initialization in 2 ~ 5 seconds.
The structure of the micropower wireless collection measurement mechanism of electric current loop power taking provided by the invention as shown in Figure 1, low-power consumption MCU, the serial ports of electric current loop commutation circuit, electric current loop sample circuit, super capacitor, electric voltage observation circuit, mu balanced circuit, built-in A/D converter and serial ports turns seven most of compositions of wireless micro power radio module.
The electric current loop commutation circuit is electronic switch S1, the S2 that forms with devices such as metal-oxide-semiconductors.As shown in Figure 2, carry out current sampling with electronics switch S 1 control current direction resistance R 1, R2, charge with control current direction super capacitor C1 with electronics switch S 2.When micro-control unit MCU did not sample to electric current loop, electronic switch S1 disconnected, S2 is closed, and the current direction super capacitor charging of electric current loop is at the input voltage V of super capacitor C1 formation mu balanced circuit
INWhen MCU need to sample to electric current loop, MCU control S1 was closed, S2 disconnects, and current direction R1, the R2 of electric current loop carry out current sampling.
The electric current loop sample circuit is to carry out A/D converter with the A/D converter that resistance carries out access MCU behind the current sampling, and sample resistance is again as the pull-up resistor of electric current loop simultaneously.As shown in Figure 2, electric current loop is from I+ and I-access, and electronic switch S1 and resistance R 1, R2 form current loop together, and electric current forms voltage drop Ui at R2 after flowing through R2, and the A/D converter of Ui access MCU carries out A/D converter.The standard termination resistance of electric current loop is 250 ohm, when the electric current loop electric current reaches 20mA, to form at the pull-up resistor two ends voltage drop of 5V, and the operating voltage of MCU is generally 3.3V, its inner A/D converter maximum input voltage also is 3.3V, therefore pull-up resistor need to be composed in series the electric current loop pull-up resistor with R1 and two resistance of R2, through access the A/D converter of MCU after R1 and the R2 dividing potential drop after the lower voltage on the R2 arrives less than 3.3V.
Electric voltage observation circuit uses the MAX6459 chip monitoring to carry out voltage monitoring, and the MAX6459 chip monitoring is with the monitoring of two-way window voltage, as shown in Figure 3.U
TH-The window voltage lower limit, U
TH+The window voltage lower limit, when IN+ is lower than U
TH-The time, the OUTA output low level is when IN+ is higher than U
TH+The time, OUTA exports high level; OUTB is then just opposite, when IN-is lower than U
TH-The time, OUTB exports high level, when IN-is higher than U
TH+The time, the OUTB output low level.Because the maximum withstand voltage of super capacitor C1 is 5V, so we are limited to 4.5V with road IN-in the MAX6459 chip monitoring and OUTB composition observation circuit, the lower 4.1V that is limited on the setting voltage.When the voltage of super capacitor was higher than 4.5V, OUTB output low level control S2 disconnection stopped electric current loop and charges to super capacitor.When the voltage of super capacitor is lower than the voltage 4.1V of setting, OUTB output high level is connected S2 charges electric current loop again to super capacitor.Wherein UV is that one road monitoring voltage is crossed output high level when low among Fig. 3, and OV is another road monitoring voltage output high level when too high.
Mu balanced circuit uses LTC1844 voltage stabilizing chip that the supply voltage of micro-control unit MCU is carried out voltage stabilizing, as shown in Figure 4.LTC1844 voltage stabilizing chip comprise IN pin, OUT pin,
Pin, BYP pin and GND pin; V
INTermination enters the IN pin; At V
INTermination enters the IN pin; At V
INTermination enters filter capacitor C2; V
OUTTermination enters the OUT pin, at V
OUTTermination enters filter capacitor C3; Shunt capacitance C4 access BYP pin; The high low-voltage access of described electric voltage observation circuit output
Pin; Described GND pin ground connection.
Filter capacitor C2 receives the voltage stabilizing chip to V
INEnd, V
INThe 3.3V voltage of voltage stable output after the voltage stabilizing of LTC1844 voltage stabilizing chip of input.We use another road IN+ of MAX6459 voltage monitoring chip and OUTA to form observation circuit, are limited to 3.9V on the setting voltage, and lower voltage limit is 3.6V.When the voltage of super capacitor C1 was higher than 3.9V, OUTA output high level was with LTC1844's
Pin is drawn high, and makes LTC1844 start working the 3.3V voltage of stable output to the power supply of MCU and wireless module.
When the voltage of super capacitor is lower than 3.6V voltage, the OUTA of MAX6459 will make LTC1844 stop to MCU and wireless module power supply output low level.Therefore the minimum discharge voltage range of super capacitor is at 3.6 ~ 3.9V, and should to satisfy under worst condition be that the electric current of electric current loop is minimum current 4mA to the capacity of super capacitor so, the power demands when initialization time is 5S:
C=It/U=(70mA-4mA)×5S/(3.9V-3.6V)=1.1F （1）；
Consider that the total working electric current that gathers measurement mechanism can not all remain on the maximum operating currenbt of 70mA during whole, therefore select the super capacitor of 1F/5V to satisfy to gather power demands during 2 ~ 5 seconds the initialization of measurement mechanism.
Because the existence of super capacitor, supply voltage rises very slow during powering on, and being electric current loop by the poorest situation calculating charges to super capacitor with the electric current 4mA of minimum, and power supply reaches 3.9V voltage after powering on need to spend long time:
t=CU/I=1F×3.9V/4mA=975S （2）；
Micro-control unit MCU may be because voltage rises slowly can not be by proper reset, and too early the entering duty and also will cause super capacitor can't store enough electric energy finishing initialization procedure for MCU of MCU.And the voltage monitoring chip is monitored super capacitor voltage, just power to MCU after only having voltage to arrive predetermined voltage 3.9V, allow MCU begin to devote oneself to work, so just can make super capacitor be stored into enough electric energy before MCU enters duty, MCU can be resetted reliably and be finished smoothly initialization.
Micropower MCU chip with A/D converter and serial ports has a lot of models, STM32F103, STM32F105, STM32F107, STM32F205, STM32F207 series such as ST, the LPC12XX of NXP, LPC12XX series etc., serial ports turns wireless micro power radio module also a lot of models, such as SZ05Zigbee digital transmission module, the EM351 of Ember company, the EM357Zigbee digital transmission module of Shanghai Shun Zhou science and technology.As shown in Figure 5, MCU outputs to wireless module by built-in serial ports, and then sends to wirelessly the data acquisition main website by wireless module by the electric current of built-in A/D converter collection electric current loop after MCU processes.
The invention provides a kind of implementation method of micropower wireless collection measurement mechanism of electric current loop power taking, comprise the steps:
The electric energy of A, electric current loop is described measurement mechanism power supply as power supply;
The current direction electric current loop sample circuit of B, described electric current loop commutation circuit control electric current loop: current direction resistance R 1 and the R2 of electronic switch S1 control electric current loop carry out current sampling; Described electronic switch S2 control current direction super capacitor C1 charging; When micro-control unit MCU did not sample to electric current loop, described electronic switch S1 disconnected; Electronic switch S2 is closed, and the current direction super capacitor charging of electric current loop is at the input voltage V of super capacitor C1 formation mu balanced circuit
INWhen MCU sampled to electric current loop, S1 was closed for micro-control unit MCU control electronic switch; Electronic switch S2 disconnects, and current direction resistance R 1 and the R2 of electric current loop carry out current sampling.
Transfer to micro-control unit MCU behind the current sampling of C, described electric current loop sample circuit electric current loop: the electric current of electric current loop is from I+ and the access of I-port, electronic switch S1 and resistance R 1 and R2 form current loop together, form voltage drop Ui at R2 behind the current flowing resistance R2 of described electric current loop, the A/D converter of described voltage drop Ui access micro-control unit MCU carries out the A/D conversion.
The A/D converter of D, described micro-control unit MCU is converted to digital quantity with the current analog amount of electric current loop;
E, the digital quantity of described electric current loop is processed by micro-control unit MCU;
F, the electric current loop current data after will processing are transferred to wireless module by the serial ports of micro-control unit MCU;
G, described wireless module send to the data acquisition main website with the electric current loop current value wirelessly.
Micropower wireless collection measurement mechanism and its implementation of electric current loop power taking provided by the invention, utilize the electric energy of electric current loop as the power supply of micropower wireless collection measurement mechanism, after micropower wireless collection measurement mechanism acquisition power supply is started working, the current analog amount of electric current loop is carried out after A/D converts digital quantity to, and MCU sends to long-range main website after processing wirelessly again.By electric current loop power taking and the combination of wireless transmission dual mode, make the user can additionally lay power lead and order wire and just can realize that remote data acquisition measures.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (17)
1. the micropower wireless collection measurement mechanism of an electric current loop power taking is characterized in that described measurement mechanism comprises:
Electric current loop commutation circuit: be used for control electric current loop sample circuit the electric current of electric current loop is taken a sample;
Super capacitor: the electric charge when being used for storing described electric current loop and being described measurement mechanism power supply;
Electric voltage observation circuit: described measurement mechanism is carried out voltage monitoring;
The electric current loop sample circuit: the electric current to electric current loop is taken a sample;
Mu balanced circuit: be used for carrying out voltage stabilizing for the supply voltage of control module MCU;
Micro-control unit MCU: be used for the control A/D converter to sampling and the Wireless Data Transmission of electric current loop electric current;
Wireless module: the electric current loop current data of micro-control unit MCU output is sent to the data acquisition main website.
2. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that, described electric current loop commutation circuit is connected with super capacitor, electric voltage observation circuit and electric current loop sample circuit respectively; Described mu balanced circuit is connected with super capacitor, electric voltage observation circuit and micro-control unit MCU respectively; Described micro-control unit MCU is connected with wireless module; The electric current of electric current loop is inputted as described electric current loop commutation circuit.
3. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that, described electric current loop commutation circuit comprises electronic switch S1 and S2; Described electric current loop sample circuit comprises resistance R 1 and R2;
Described electronic switch S1, resistance R 1 and resistance R 2 are connected successively, form the S1-R1-R2 branch road; Described electronic switch S2 and super capacitor C1 connect successively, form the S2-C1 branch road; Described S1-R1-R2 branch road and S2-C1 branch circuit parallel connection; Described S1-R1-R2 branch road and the equal ground connection of S2-C1 branch road;
Input end at electronic switch S1 and S2 forms the I+ port; Input end in resistance R 2 forms the I-port; The voltage of resistance R 2 is reduced to Ui; The A/D converter of Ui access micro-control unit MCU, the size of the size reflection electric current loop electric current of Ui voltage.
4. micropower wireless collection measurement mechanism as claimed in claim 3 is characterized in that, described electronic switch S1 and S2 adopt the power electronic devices metal-oxide-semiconductor to form; Described resistance R 1 and R2 are composed in series the pull-up resistor of electric current loop.
5. micropower wireless collection measurement mechanism as claimed in claim 3 is characterized in that, the minimum discharge voltage range of described super capacitor C1 is between 3.6 ~ 3.9V; The maximum withstand voltage of described super capacitor C1 is 5V.
6. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that, described electric voltage observation circuit adopts the MAX6459 chip monitoring to carry out voltage monitoring; Described MAX6459 chip monitoring comprises the monitoring of two-way window voltage, and every road voltage monitoring mode is the window voltage monitoring, and window voltage is all set on every road, and window voltage comprises upper voltage limit U
TH+With lower voltage limit U
TH-Described MAX6459 chip monitoring comprises two output voltage, is respectively OUTA and OUTB.
7. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that, described mu balanced circuit adopts LTC1844 voltage stabilizing chip that the supply voltage of micro-control unit MCU is carried out voltage stabilizing; Described LTC1844 voltage stabilizing chip comprise IN pin, OUT pin,
Pin, BYP pin and GND pin;
V
INTermination enters the IN pin; At V
INTermination enters filter capacitor C2;
V
OUTTermination enters the OUT pin, at V
OUTTermination enters filter capacitor C3;
Shunt capacitance C4 access BYP pin;
The high low-voltage access of described electric voltage observation circuit output
Pin;
Described GND pin ground connection.
8. micropower wireless collection measurement mechanism as claimed in claim 7 is characterized in that, described filter capacitor C2, C3 and the equal ground connection of C4; Described filter capacitor C2 and C3 are 1 μ F; Described shunt capacitance C4 is 0.1 μ F.
9. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that described micro-control unit comprises A/D converter and serial ports; Described A/D converter is used for gathering the sampling voltage Ui of the sampled rear formation of electric current loop electric current and converting thereof into digital quantity, and the size of voltage U i has reflected the size of electric current loop electric current; Described serial ports outputs to wireless module with the electric current loop current value of conversion by serial ports.
10. micropower wireless collection measurement mechanism as claimed in claim 9 is characterized in that, described micro-control unit comprises that employing is with micropower MCU chip; The MCU chip of described micropower comprises STM32F103, STM32F105, STM32F107, STM32F205, the STM32F207 series of ST, and the LPC12XX of NXP, LPC12XX series.
11. micropower wireless collection measurement mechanism as claimed in claim 1 is characterized in that, described wireless module adopts the Zigbee digital transmission module; Described Zigbee digital transmission module comprises SZ05Zigbee digital transmission module, EM351Zigbee digital transmission module and EM357Zigbee digital transmission module.
12. the implementation method of the micropower wireless collection measurement mechanism of an electric current loop power taking is characterized in that described method comprises the steps:
The electric energy of A, electric current loop is described measurement mechanism power supply as power supply;
B, described electric current loop commutation circuit are controlled the current direction electric current loop sample circuit of electric current loop or are flowed to super capacitor C2 charging;
After taking a sample electric current loop, C, described electric current loop sample circuit transfer to the A/D converter of micro-control unit MCU;
The A/D converter of D, described micro-control unit MCU is converted to digital quantity with the current analog amount of electric current loop;
E, the digital quantity of described electric current loop is processed by micro-control unit MCU;
F, the electric current loop current data after will processing are transferred to wireless module by the serial ports of micro-control unit MCU;
G, described wireless module send to the data acquisition main website with the electric current loop current value wirelessly.
13. the implementation method of the micropower wireless collection measurement mechanism of electric current loop power taking as claimed in claim 12 is characterized in that, among the described step B, current direction resistance R 1 and the R2 of electronic switch S1 control electric current loop carry out current sampling; Described electronic switch S2 control current direction super capacitor C1 charging;
When micro-control unit MCU did not sample to electric current loop, described electronic switch S1 disconnected; Electronic switch S2 is closed, the current direction super capacitor charging of electric current loop;
When MCU sampled to electric current loop, S1 was closed for micro-control unit MCU control electronic switch; Electronic switch S2 disconnects, and current direction resistance R 1 and the R2 of electric current loop carry out current sampling.
14. the implementation method of the micropower wireless collection measurement mechanism of electric current loop power taking as claimed in claim 12, it is characterized in that, among the described step C, the electric current of described electric current loop is from described I+ and the access of I-port, electronic switch S1 and resistance R 1 and R2 form current loop together, form voltage drop Ui at R2 behind the current flowing resistance R2 of described electric current loop, the A/D converter of described voltage drop Ui access micro-control unit MCU carries out the A/D conversion.
15. the implementation method of the micropower wireless collection measurement mechanism of electric current loop power taking as claimed in claim 12 is characterized in that, during execution in step A-G, to the voltage of described measurement mechanism monitor again by described electric voltage observation circuit for described method.
16. the implementation method of the micropower wireless collection measurement mechanism of electric current loop power taking as claimed in claim 15 is characterized in that, when the input voltage of electric voltage observation circuit is lower than window voltage lower limit U
TH-The time, described OUTA output low level; When input voltage is higher than window voltage upper limit U
TH+The time, described OUTA output high level; When input voltage is lower than window voltage lower limit U
TH-The time, described OUTB output high level is when input voltage is higher than window voltage upper limit U
TH+The time, described OUTB output low level.
17. the implementation method of the micropower wireless collection measurement mechanism of electric current loop power taking as claimed in claim 12, it is characterized in that, when transferring to micro-control unit MCU behind the electric current of electric current loop sample circuit sample rate current ring, described mu balanced circuit carries out voltage stabilizing to the supply voltage of micro-control unit MCU.
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| CN201210333673.XA Active CN102901523B (en) | 2012-09-10 | 2012-09-10 | A kind of micropower wireless collection measurement mechanism of electric current loop power taking and its implementation |
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| CN106291047A (en) * | 2016-07-29 | 2017-01-04 | 广州供电局有限公司 | Instant inserted and instant using type voltage monitoring system |
| CN106707014A (en) * | 2017-03-08 | 2017-05-24 | 北京瑞普三元仪表有限公司 | 4-20mA two-wire passive current loop measurement instrument |
| CN107357203A (en) * | 2017-07-01 | 2017-11-17 | 合肥东玖电气有限公司 | A kind of high-low voltage continuous monitoring device |
| CN110173845A (en) * | 2019-05-10 | 2019-08-27 | 广东美的制冷设备有限公司 | The communication control method of air conditioner and air conditioner, device |
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| CN110173845B (en) * | 2019-05-10 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioner and communication control method and device of air conditioner |
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| CN102901523B (en) | 2015-09-09 |
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