CN202453023U - Passive direct reading circuit for variable-resistance gas meter - Google Patents
Passive direct reading circuit for variable-resistance gas meter Download PDFInfo
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- CN202453023U CN202453023U CN2012200753977U CN201220075397U CN202453023U CN 202453023 U CN202453023 U CN 202453023U CN 2012200753977 U CN2012200753977 U CN 2012200753977U CN 201220075397 U CN201220075397 U CN 201220075397U CN 202453023 U CN202453023 U CN 202453023U
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Abstract
The utility model relates to a passive direct reading circuit for a variable-resistance gas meter. The passive direct reading circuit comprises an energy capture communication module circuit, a control module circuit and a variable-resistance sampling circuit, wherein the energy capture communication module circuit comprises an antenna and an energy capture communication module chip which are mutually connected, the energy capture communication module chip converts captured radio frequency signals emitted by external reading and writing equipment into electric energy for providing the electric energy for the whole circuit, in addition, the communication is carried out through the radio frequency signals, data inside the chip is transmitted to the external reading and writing equipment, different character wheel values of the fuel gas meter are converted into corresponding different resistance values by the variable-resistance sampling circuit, a microprocessor of the control module circuit is controlled to carry out sampling processing for obtaining character code data, and in addition, the character code data is stored into the energy capture communication module chip. The passive direct reading circuit realizes the passive data reading, a power supply is omitted, and the real intrinsic safety is realized.
Description
Technical field
The utility model belongs to electronic technology field, is specifically related to the passive direct-reading circuit of a kind of variable resistance type gas meter, flow meter.
Background technology
The existing gas meter, flow meter overwhelming majority is a mechanical type, and also having few is to adopt electronically to measure.The mechanical gas table utilizes the mobile promotion character wheel rotation of combustion gas, thereby obtains flow value; The electronic gas table adopts modes such as ultrasound wave, jet to detect the gas-flow value.
Because the needs of checking meter; Gas meter, flow meter need spread out of the gas-flow value that records; Finally pass to the database of gas company through RF-wise (RF), near-field communication (NFC), GPRS means such as (GPRS), gas company is settled accounts according to this.
The mechanical gas table utilizes the character wheel reading to show the gas-flow value, needs artificial reading to carry out craft and checks meter time-consuming taking a lot of work.If as carrying out remote meter reading, need be converted into electric signal to this mechanical character wheel number, just can handle and transmit.Concrete conversion transform mode has following several kinds: photo-electronic directly reading mode, tongue tube mode, Hall element mode, changes in resistance mode, coded system and camera shooting type.The photo-electronic directly reading mode is that one group of infrared light passes character wheel along the character wheel axis direction, thereby because the combination of character wheel position of opening obtains character wheel numerical value, this mode is the character wheel instantaneous value.Tongue tube and Hall element reading mode obtain character wheel numerical value for being the step-by-step counting mode thereby revolve the mode accumulative total that produces a pulse that turns around by character wheel, and this mode is the character wheel aggregate-value, needs character wheel initial value and aggregate-value can obtain the character wheel instantaneous value.The changes in resistance mode is the different corresponding different resistance of character wheel numerical value, thereby knows the character wheel value through gathering resistance, and this mode is the character wheel instantaneous value.Coded system adopts code switch character wheel mode, represents the character wheel value by 4 switch various combinations, and the state of gathering these 4 switches obtains the character wheel value, and this mode is the character wheel instantaneous value.Camera shooting type adopts to be taken character wheel and obtains the character wheel value through Flame Image Process, and this mode is the character wheel instantaneous value.In the aforesaid way, the Hall mode needs 24 hours uninterrupted power supplies, and all the other then can be supplied power in image data and get final product.
Because combustion gas is a flammable explosive gas, when on stem-winder, using field of electronic components, can not adopt the 220V commercial power supply, can only utilize powered battery, and battery exists loss and life problems, so in the living life cycle of gas meter, flow meter, need to change battery.There are many inconveniences in this for user and gas company, does not for example in time change battery, may have the problem that can't pass the combustion gas gas consumption back gas company in time, accurately.
Summary of the invention
The utility model proposes the passive direct-reading circuit of a kind of variable resistance type gas meter, flow meter to the deficiency of prior art.
The utility model comprises energy capture communication module circuit, control module circuit and variable resistor sample circuit.Energy capture communication module circuit comprises antenna and energy capture communication chip, and antenna is connected with the energy capture communication chip, obtains the radiofrequency signal of exterior read-write equipment emission; The energy capture communication chip converts the radiofrequency signal that captures into electric energy; Electric energy is provided for chip itself, control module circuit and variable resistor sample circuit; And communicate through the radiofrequency signal of exterior read-write equipment emission, give exterior read-write equipment the data transmission of chip internal; The variable resistor sample circuit character wheel value that the mechanical gas table is different converts corresponding different resistances into, and changes voltage signal into; The microprocessor of control module circuit is gathered the voltage signal in the variable resistor sample circuit, converts corresponding character code data into, and communicates by letter with the energy capture communication chip, and the character code data are deposited in the energy capture communication chip.
Described energy capture communication chip adopts the chip that has energy capture function and communication function simultaneously; Collect the radiofrequency signal of exterior read-write equipment emission through antenna; And convert the radiofrequency signal of gathering into electric energy; The radiofrequency signal carrier frequency from low frequency 100KHz to high frequency, ultrahigh frequency and microwave 6GHz, can communicate with the exterior read-write equipment of emitting radio frequency signal, and communicate with microprocessor in the control module circuit; The energy capture communication chip has antennal interface, output port of power source, COM1.
Described control module circuit comprises microprocessor and auxiliary circuit device, and the auxiliary circuit device comprises electric capacity, resistance, crystal oscillator; Described microprocessor is single-chip microcomputer, Arm or Dsp, has data processing module, data communication module, power input mouth and I/O interface; The power input mouth of microprocessor is connected with the output port of power source of energy capture communication chip.Electric capacity in the auxiliary circuit device is used for functions such as filtering, resonance, energy storage generally as shunt capacitance, decoupling capacitor, resonant capacitance or storage capacitor; Resistance in the auxiliary circuit device is generally as pull-up resistor or as dividing potential drop, shunt resistance; Crystal oscillator mainly is clock to described microprocessor to be provided, and also has microprocessor internal to have crystal oscillator, then can not need external crystal-controlled oscillation; Described electric capacity, resistance, crystal oscillator adopt the mode of series connection or parallel connection to connect.The auxiliary circuit device is ripe electronic devices and components, and its connected mode also adopts conventional prior art.
Described variable resistor sample circuit comprises the variable resistor parallel circuit of a plurality of parallel connections; Each variable resistor parallel circuit structure is identical; Comprise a variable resistor and a pull-up resistor, the I/O interface of a termination microprocessor of pull-up resistor or the output port of power source of energy capture communication chip are imported as power supply; The other end of pull-up resistor is connected with a variable-resistance end; As variable-resistance sampling spot, sampling spot is connected a variable-resistance other end ground connection with the I/O interface that an A/D thief hatch of microprocessor is perhaps simulated the A/D sampling.
Each character wheel on the corresponding mechanical gas table before the radix point is provided with a variable resistor, and described variable resistor comprises the resistance dish and be arranged on the contact stud on the character wheel, and the resistance dish is provided with resistive band, and resistive band is continuous resistance or discrete resistors; When character wheel rotated, contact stud rotated thereupon, and contact stud is realized different resistance output with the resistive band contact along with character wheel rotates.Variable resistor structure is ripe prior art.
Power supply that has no in the passive direct-reading circuit of the variable resistance type gas meter, flow meter of the utility model and long-term energy-storage travelling wave tube be battery or big electric capacity for example, and in the period that need not check meter, this circuit is not in working order; Only when needs are checked meter just by the exterior read-write equipment emitting radio frequency signal; The energy acquisition communication chip is gathered the radiofrequency signal of exterior read-write equipment emission and converts electric energy into to supply power to system; And communicate through the radiofrequency signal of exterior read-write equipment emission, give exterior read-write equipment the data transmission of chip internal.According to the managerial requirement of national relevant radio, the radiofrequency signal power of emission is just limited, so the electric energy that captures is lower, even when checking meter, system power dissipation is in the microwatt rank.The utility model has been realized the passive mode sense data, does not have power supply, realizes real essential safety.
Description of drawings
Fig. 1 is the system chart of the utility model;
Fig. 2 is the energy capture communication module circuit and the control module circuit diagram of the utility model;
Fig. 3 is the circuit diagram of the variable resistor parallel circuit of the utility model;
Fig. 4 is the character wheel structural representation of band contact stud;
Fig. 5 is a resistance dish structural representation.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further explanation.
As shown in Figure 1, the passive direct-reading circuit of a kind of variable resistance type gas meter, flow meter comprises energy capture communication module circuit, control module circuit 2 and variable resistor sample circuit 3.Energy capture communication module circuit comprises antenna 1 and energy capture communication chip U1, and antenna 1 is connected with energy capture communication chip U1, obtains the radiofrequency signal of exterior read-write equipment emission; Energy capture communication chip U1 converts the radiofrequency signal that captures into electric energy; Electric energy is provided for chip itself, control module circuit 2 and variable resistor sample circuit 3; And communicate through the radiofrequency signal of exterior read-write equipment emission, give exterior read-write equipment the data transmission of chip internal; The variable resistor sample circuit 3 character wheel value that the mechanical gas table is different converts corresponding different resistances into, and changes voltage signal into; The microprocessor U2 of control module circuit 2 gathers the voltage signal in the variable resistor sample circuit 3, converts corresponding character code data into, and communicates by letter with energy capture communication chip U1, and the character code data are deposited among the energy capture communication chip U1.
Energy capture communication chip U1 adopts the M24LR16 chip that has energy capture function and communication function simultaneously; Collect radiofrequency signal through antenna 1; And convert the radiofrequency signal of gathering into electric energy; The radiofrequency signal carrier frequency is 13.56MHz ± 7KHz, realizes simultaneously communicating with the exterior read-write equipment of emitting radio frequency signal, and communicates with microprocessor U2 in the control module circuit 2.
As shown in Figure 2,2 pin of M24LR16 chip are connected with the two ends of antenna 1 respectively with 3 pin, 4 pin ground connection, and 1 pin is connected with control module circuit 2 as power output end; The port that 5 pin of M24LR16 chip and 6 pin conducts and control module circuit 2 communicate is through I
2Microprocessor U2 in C mode and the control module circuit 2 communicates; 7 pin are connected with control module circuit 2, are one and open leakage output pin, be used to provide with exterior read-write equipment radio communication action message to control module circuit 2.When the M24LR16 chip communicates through antenna 1 and exterior read-write equipment; 7 pin output low level signals of M24LR16 chip are given control module circuit 2; When M24LR16 chip and exterior read-write equipment did not communicate, 7 pin of M24LR16 chip output high level signal was given control module circuit 2; 8 pin are connected with control module circuit 2, are power input, to drive 5,6,7 pin of M24LR16 chip.
Variable resistor sample circuit 3 comprises the variable resistor parallel circuit of a plurality of parallel connections.As shown in Figure 3, each variable resistor parallel circuit structure is identical, comprises a variable resistor Rv and a pull-up resistor R11.53 pin of the termination MSP430F4152 chip of pull-up resistor R11; Through the MSP430F4152 chip power supply; The other end of pull-up resistor R11 is connected with the end of variable resistor Rv, and as variable-resistance sampling spot S, sampling spot S is connected with an A/D sampling interface of MSP430F4152 chip; The A/D sampling interface of MSP430F4152 chip is respectively 3 pin, 4 pin, 5 pin, 6 pin, 11 pin, 60 pin, 61 pin and 63 pin, the other end ground connection of variable resistor Rv.
Shown in Figure 4 and 5, the mechanical gas table is provided with a plurality of character wheels 4, comprises behind the radix point before 2～3, radix point being 3～8, and each character wheel 4 before the corresponding radix point is provided with a variable resistor.Variable resistor comprises resistance dish 6 and is arranged on the contact stud 5 on the character wheel 4, and resistance dish 6 is the insulating disc of a circle, in the middle of the insulating disc 6 for endless metal dish 7 and draw single line; Be uniform-distribution with 60 discrete resistors 8 on the insulating disc 6; When character wheel rotated, contact stud 5 rotated thereupon, and an end of contact stud 5 keeps contacting with endless metal dish 7; The other end of contact stud 5 contacts with discrete resistors 8, according to the different different resistances of position output.
Each variable resistor passes through the different resistance of output, the numeral of 10 systems on the corresponding character wheel, and concrete wheel digital is corresponding as shown in the table with variable-resistance different resistance values:
| The character wheel reading | Variable resistor Standard resistance range (K Ω) |
| 0 | 0-2.99 |
| 1 | 3-5.99 |
| 2 | 6-8.99 |
| 3 | 9-11.99 |
| 4 | 12-14.99 |
| 5 | 15-17.99 |
| 6 | 18-20.99 |
| 7 | 21-23.99 |
| 8 | 24-26.99 |
| 9 | 27-29.99 |
The course of work of the passive direct-reading circuit of this variable resistance type gas meter, flow meter is: peripheral read-write equipment sends radiofrequency signal (RF); Antenna 1 receives this radiofrequency signal; And be defeated by energy capture communication chip U1 to radiofrequency signal and be converted into electric energy; Offer energy capture communication chip U1 and microprocessor U2, variable resistor sample circuit 3 is given through the 53rd pin output voltage in microprocessor U2 operation back, and the A/D thief hatch of microprocessor U2 is through sampling and conversion then; Obtain gas meter, flow meter character wheel data, close the output of 53 pin then.
The 13rd pin output voltage of microprocessor U2 is given the Vcc pin of energy capture communication chip U1, and detects the 14th pin of microprocessor U2, if for low level then represent that energy capture communication chip U1 is in the RF write data or is carrying out the RF order, just can not carry out I
2The C communication.Microprocessor U2 gets into low-power consumption mode, and when detecting high level, then microprocessor U2 and energy capture communication chip U1 carry out I
2The C communication, the storer of catching communication chip U1 to the character wheel data write energy that obtains.Write the back that finishes and break off I
2The C communication.
Exterior read-write equipment can read the character wheel data of energy capture communication chip stored again through radiofrequency signal.Exterior read-write equipment and M24LR16 carry out communication and support ISO15693, ISO18000-3 agreement.
The energy capture communication chip can also adopt the mode of two chip portfolios: one of them chip is the energy capture chip, and this chip has the function of energy capture, but can't communicate with microprocessor; Another chip is a communication chip, and this chip utilizes the energy capture chip power supply, and an end connects microprocessor, obtains the character wheel numerical value that microprocessor is gathered, and adopts RF-wise and exterior read-write equipment to communicate.
Claims (3)
1. passive direct-reading circuit of variable resistance type gas meter, flow meter; Comprise energy capture communication module circuit, control module circuit and variable resistor sample circuit; Be characterised in that: energy capture communication module circuit comprises antenna and energy capture communication chip; Antenna is connected with the energy capture communication chip, obtains the radiofrequency signal of exterior read-write equipment emission; The energy capture communication chip converts the radiofrequency signal that captures into electric energy; Electric energy is provided for chip itself, control module circuit and variable resistor sample circuit; And communicate through the radiofrequency signal of exterior read-write equipment emission, give exterior read-write equipment the data transmission of chip internal; The variable resistor sample circuit character wheel value that the mechanical gas table is different converts corresponding different resistances into, and changes voltage signal into; The microprocessor of control module circuit is gathered the voltage signal in the variable resistor sample circuit, converts corresponding character code data into, and communicates by letter with the energy capture communication chip, and the character code data are deposited in the energy capture communication chip;
Described energy capture communication chip adopts the chip that has energy capture function and communication function simultaneously; Collect radiofrequency signal through antenna; And convert the radiofrequency signal of gathering into electric energy; Can communicate with the exterior read-write equipment of emitting radio frequency signal, and communicate with microprocessor in the control module circuit; The energy capture communication chip has antennal interface, output port of power source, COM1;
Described control module circuit comprises microprocessor and auxiliary circuit device, and the auxiliary circuit device comprises electric capacity, resistance, crystal oscillator; Described microprocessor is single-chip microcomputer, Arm or Dsp, has data processing module, data communication module, power input mouth and I/O interface; The power input mouth of microprocessor is connected with the output port of power source of energy capture communication chip;
Described variable resistor sample circuit comprises the variable resistor parallel circuit of a plurality of parallel connections; Each variable resistor parallel circuit structure is identical; Comprise a variable resistor and a pull-up resistor, the I/O interface of a termination microprocessor of pull-up resistor or the output port of power source of energy capture communication chip are imported as power supply; The other end of pull-up resistor is connected with a variable-resistance end; As variable-resistance sampling spot, sampling spot is connected a variable-resistance other end ground connection with the I/O interface that an A/D thief hatch of microprocessor is perhaps simulated the A/D sampling.
2. the passive direct-reading circuit of a kind of variable resistance type gas meter, flow meter as claimed in claim 1 is characterized in that: described energy capture communication chip through antenna collect the radiofrequency signal carrier frequency from low frequency 100KHz to high frequency, ultrahigh frequency and microwave 6GHz.
3. the passive direct-reading circuit of a kind of variable resistance type gas meter, flow meter as claimed in claim 1; It is characterized in that: each character wheel on the corresponding mechanical gas table before the radix point is provided with a variable resistor; Described variable resistor comprises the resistance dish and is arranged on the contact stud on the character wheel; The resistance dish is provided with resistive band, and resistive band is continuous resistance or discrete resistors; When character wheel rotated, contact stud rotated thereupon, and contact stud is realized different resistance output with the resistive band contact along with character wheel rotates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200753977U CN202453023U (en) | 2012-03-02 | 2012-03-02 | Passive direct reading circuit for variable-resistance gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200753977U CN202453023U (en) | 2012-03-02 | 2012-03-02 | Passive direct reading circuit for variable-resistance gas meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202453023U true CN202453023U (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200753977U Expired - Lifetime CN202453023U (en) | 2012-03-02 | 2012-03-02 | Passive direct reading circuit for variable-resistance gas meter |
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| Country | Link |
|---|---|
| CN (1) | CN202453023U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589631A (en) * | 2012-03-02 | 2012-07-18 | 浙江威星智能仪表股份有限公司 | Variable resistance type passive direct-reading circuit for gas meters |
| CN103837167A (en) * | 2014-03-05 | 2014-06-04 | 国家电网公司 | Non-contact type infrared passive radio frequency data collecting sensor |
-
2012
- 2012-03-02 CN CN2012200753977U patent/CN202453023U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589631A (en) * | 2012-03-02 | 2012-07-18 | 浙江威星智能仪表股份有限公司 | Variable resistance type passive direct-reading circuit for gas meters |
| CN102589631B (en) * | 2012-03-02 | 2013-07-10 | 浙江威星智能仪表股份有限公司 | Variable resistance type passive direct-reading circuit for gas meters |
| CN103837167A (en) * | 2014-03-05 | 2014-06-04 | 国家电网公司 | Non-contact type infrared passive radio frequency data collecting sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120926 Effective date of abandoning: 20130710 |
|
| RGAV | Abandon patent right to avoid regrant |