CN2752732Y - Non-magnetic sensor measuring device - Google Patents

Abstract

The utility model relates to a device which realizes flow measurement by using an SCAN IF module of MSP430FW42X. Two inductors of a resonant circuit are arranged above an impeller, the half of which is coated with copper or other metal with damping performance. The impeller is sheathed on an impeller shaft; an electrical signal input of the resonant circuit is connected with a signal input end in which a nonmagnetic flow measuring module of a single chip computer, and the rotation quantity and the rotation direction are calculated by the nonmagnetic flow measuring module. The utility model has the advantages that the service life of a battery is extended, and the accuracy and the performance of a meter are improved because an MCU with super-low power consumption, a rotation scanning interface and a liquid crystal display LCD driving module are perfectly combined into a whole; the rotation flow measurement is realized in a high precision way because the resonant circuit is used as a measuring signal sensor of the nonmagnetic flow measuring module.

Description

The non-magnetic sensor measurement mechanism

Technical field:

The utility model relates to the device of the SCAN IF module realization flow measurement of a kind of MSP430FW42X of using, belongs to fluid measurement instrument and makes the field.

Background technology:

Granted publication CN2570741Y, title " a kind of no magnetic sensing intelligence water meter ", this water meter comprises watchcase, valve seat, movement, electrically operated valve, fluidic generator, non-magnetic sensor, adopt the signal pickup assembly of no magnetic sensing, reduce the initiating flow of water meter, make metering more rationally accurately.

Granted publication CN2572371Y, title " hydrophily heat/cold meter ", this sensor detector comprise two telefaults and; Horizontal fixed has sheet metal on the rotor of described rotor water gauge; The turning axle of the described rotor of described inductive coil symmetry is arranged on the described upper cover plate, the rotor rotation, and sheet metal causes relative inductance value to change with the relative position variation of two telefaults.

Summary of the invention:

Purpose of design: adopt resonant tank (LC sensor) to combine, realize accurate measurement to various fluid flows with the SCAN IF module of MSP430FW42X.

Design proposal: the MSP430FW42x series monolithic is that TI is at the special-purpose MCU chip of electronic type flow with the up-to-date exploitation of detection that rotatablely moves, it ideally is combined as a whole super low-power consumption MCU, rotation sweep interface (Scan IF) and liquid crystal display LCD driver module, the super low-power consumption structure of this device and flow detection module have not only prolonged the life-span of battery, have also improved the precision and the performance of instrument simultaneously.SCAN IF module can be in the motion of automatic inspection line under the low-power consumption or rotation.SCAN IF module is formed by three: AFE (analog front end) (AFE), signal Processing state machine (PSM), definition status machine (TSM).Wherein the main components and parts of AFE (analog front end) are " VCC/2 " generators, a comparer and 10 DAC, AFE (analog front end) stimulus sensor, detection signal and be conversion of signals digital form; These digital signal entering signal treatment state machines, the signal Processing state machine rotatablely moves according to these signal analysis and counting, and the signal Processing state machine calculates rotation (fluid flow) and its direction; Definition status machine control AFE (analog front end) and signal Processing state machine.1. ultimate principle: a mechanical hook-up that is made of impeller or cross helical gear flows fluid and is converted to rotation, and this conversion can realize the measurement of fluid flow.Place the inductance in the resonant tank top of impeller can detect the rotation of impeller, half of impeller is covered with copper or other have the metal of damping and amortization.By the determining positions of inductance above impeller the ratio of damping of resonant tank, when inductance is positioned at regional a, when the ratio of damping in loop is higher than inductance and is positioned at regional b.By measuring the different damping coefficient of resonant tank, can realize measurement to rotating.Fig. 1 is the measuring principle synoptic diagram.2. vibration test method: Fig. 2 has provided the waveform when 2 sensors are positioned at zones of different, and MSP430FW42X adopts the vibration test method that different attenuation amplitudes is converted to digital signal and measures.This method is expressed as " L " to the damping factor of the sensor among Fig. 21, and the damping factor of sensor 2 is expressed as " H ".3. signal Processing: along with wheel rotation, the signal of sensor 1 and sensor 2 constantly changes thereupon.Fig. 3 has provided the state variation of two sensors, if know preceding state and new state, can draw the direction of rotation simultaneously.Increase counting: change to state " a " by state " d "; Subtract counting: change to state " a " by state " b ".

Technical scheme 1: non-magnetic sensor measurement mechanism, inductance in two resonant tanks places the top of impeller to detect the rotation of impeller, half of impeller is covered with copper or other have the metal of damping and amortization, and the measured electric signal of resonant tank inputs to the signal input part of built-in SCAN IF in the MSP430FW42X single-chip microcomputer and calculates rotation (fluid flow) and its direction by SCAN IF module.

Technical scheme 2: no magnetic water meter, it comprises power supply, liquid crystal display LCD and motor driven by-pass valve control, and the rotation sweep interface among the MSP430FW42X (Scan IF) connects signal output part, communication interface IC-card or radio-frequency card or the M-BUS teletransmission of two LC resonant tanks respectively.

The utility model is compared with background technology, the one, because the MSP430FW42x series monolithic is that TI is at the special-purpose MCU chip of electronic type flow with the up-to-date exploitation of detection that rotatablely moves, it ideally is combined as a whole super low-power consumption MCU, rotation sweep interface (ScanIF) and liquid crystal display LCD driver module, the super low-power consumption structure of this device and flow detection module have not only prolonged the life-span of battery, have also improved the precision and the performance of instrument simultaneously; The 2nd, adopt the measuring-signal sensor of resonant tank as the rotation sweep interface, by measuring the different damping coefficient of resonant tank, can realize to high precision measurement to rotation flow; The 3rd, the fluid measurement utensil that adopts MSP430FW42X to design, its circuit structure are very simple, reliable; The 4th, do not need external flow to detect IC, directly replace TMS3723B, simplify The Hardware Design and software design greatly, and improved the stability of system; The 5th, be not only applicable to heat meter, hot water and cold water instrument, gas instrument and industrial flowmeter, windage scale and other rotations and detect application, and the application of timer support counter, the operation of radio frequency bit stream, IrDA and M-Bus communication, and can realize that analog-to-digital general-purpose simulation comparer A can be used in the calorimeter.

Description of drawings:

Fig. 1 is 2 structural representations that the LC sensor measurement rotatablely moves in the non-magnetic sensor measurement mechanism.

Fig. 2 is the waveform synoptic diagram of 2 LC sensors when being positioned at zones of different.

Fig. 3 is the state variation synoptic diagram of 2 LC sensors.

Fig. 4 adopts MSP430FW42X design water meter block scheme.

Fig. 5 is a SCAN IF module frame chart.

Embodiment:

Embodiment 1: the non-magnetic sensor measurement mechanism, (resonant tank is the LC resonant tank to two resonant tanks, LC resonance measurement sensor just) inductance in places the top of impeller to detect the rotation of impeller, and half of impeller is covered with copper or other have the metal of damping and amortization, sees accompanying drawing 1.The measured electric signal of resonant tank is finished by built-in SCAN IF module in MSP430FW42X (MSP430FW423, MSP430FW425, the MSP430FW427) single-chip microcomputer, calculates rotation (fluid flow) and its direction by the SCANIF module, sees accompanying drawing 5.One end of two resonant tanks, one end and capacitor C also connects the SIFCOM end of SCAN IF module, the other end ground connection of capacitor C, and the other end of two resonant tanks connects the SIFCHO and the SIHF1 end of SCAN IF module respectively, sees accompanying drawing 1.SCAN IF module is made up of AFE (analog front end) (AFE), signal Processing state machine (PSM), definition status machine (TSM), AFE (analog front end) stimulus sensor wherein, detection signal and be conversion of signals digital form, these digital signal entering signal treatment state machines, the signal Processing state machine rotatablely moves according to these signal analysis and counting, definition status machine control AFE (analog front end) and signal Processing state machine are seen accompanying drawing 1.1. the basic setup of CAN IF: control register SIFCTL1, SIFCTL2, SIFCTL3, SIFCTL4, SIFCTL5 that SCAN IF is set; Definition P6.x/SIFCH.x pin is a SCAN IF functions of modules; Open " VCC/2 " generator; Clock source selection; The signal condition processor; 2. plan the time state machine: the time state machine of SCAN IF is used for determining the measurement sequence, and each required time in step can be adjusted accurately, and common measurement sequence is as follows: determine idle condition; Excitation LC sensor; The time-delay regular hour, measure this moment and can carry out; Open DAC and comparer; Measure; Stop; 3. define the magnetic hysteresis thresholding of DAC: DAC and provide the magnetic hysteresis thresholding for the damping and the self-sustained oscillation device of each sensor, oscillating curve by observing each sensor and the voltage of DAC are adjusted the magnetic hysteresis thresholding of DAC; 4. signal Processing state machine: it is a programmable state machine that the signal Processing state machine is handled, and it draws rotating speed and direction by the state table that is stored in the MSP430 storer, the state table of vectorial SIFTPSMV initial directional PSM.Its measuring method: as mentioned above, since the determining positions of inductance above impeller the ratio of damping of resonant tank, when inductance is positioned at regional a, when the ratio of damping in loop is higher than inductance and is positioned at regional b, by measuring the different damping coefficient of resonant tank, MSP430FW42X adopts the vibration test method that different attenuation amplitudes is converted to digital signal and measures, to realize the measurement to rotating.Along with wheel rotation, the signal in two resonant tanks constantly changes thereupon, knows preceding state and new state, promptly draws the direction of rotation, increases counting: change to state " a " by state " d "; Subtract counting: change to state " a " by state " b ", see accompanying drawing 2 and 3.

SCAN IF module initialization program:

void?InitScanIF(void){int?i；P6SEL|＝0x03；

// initialization time state machine

SIFTSM0＝0x0000；SIFTSM1＝0x002C；SIFTSM2＝0x0404；SIFTSM3＝0x0934；

SIFTSM4＝0x3174；SIFTSM5＝0x0220；

The magnetic hysteresis thresholding of // given DAC

SIFDACR0＝0x0330；SIFDACR1＝0x0330；

The control register of // initialization Scan IF

SIFCTL2＝0x0140；for(i＝0；i＜＝857；i++)；SIFCTL3＝0x0100；SIFCTL4＝0x13F0；

SIFCTL5＝0x0045；SIFTPSMV＝(unsigned?int)&PSM；SIFCTL1|＝0x1001；

Embodiment 2: no magnetic water meter, it comprises power supply, liquid crystal display LCD and motor driven by-pass valve control, and the motor driven by-pass valve control is controlled by the CMU processing unit, is used for the unlatching of by-pass valve control or closes, when in the card (or CMU processing unit record) when rich, valve is opening; When in the card (or CMU processing unit record) during no money, valve is closed condition.Rotation sweep interface (ScanIF) among the MSP430FW42X (MSP430FW423, MSP430FW425, MSP430FW427) connects signal output part, communication interface IC-card or radio-frequency card or the M-BUS teletransmission of two LC resonant tanks respectively.Be connected to electric capacity between two LC resonant tank signal output parts and rotation sweep interface.Be provided with antiwithdrawal device and motor driven in the no magnetic water meter.Measuring principle: being converted to rotatablely moves realizes the detection of fluid flow to this programme by fluid is flowed.Adopt with the impeller of metal film and realize this conversion, ducted fluid promotes the continuous rotation of impeller, and its rotating speed directly is decided by flow rate of fluid.This mechanical rotation signal is translated into the SCAN IF module that electric signal is delivered to microcontroller through no magnetic non-contacting sensor, and SCAN IF module calculates rotation (fluid flow) and its direction.Major function; 1. water consumption metering: total water amount, when the water consumption per month metering; Store 12 months historical water usage: 2. time management: have calendar, timing and leap year automatic switching function; Calendar, time are provided with the measure that prevents unauthorized people's operation; 3. logout: a, water yield record: purchased the time of water last time and purchased the water yield, total water amount, surplus water, last 12 months historical water usage: b, battery management: under-voltage record of battery and prompting; C, artificial destruction record; Tear table record open; 4. show: the integrated flow of display water-meter, surplus water, this purchases relevant informations such as the water yield and water meter valve state, battery status; DISPLAY ORDER and display time intervals can preset; Report to the police and the error message prompting; 5. communication interface: can choose any one kind of them in three kinds of modes below.IC-card, radio-frequency card, M_BUS teletransmission; 6. button operation:, display button can be set according to user's base table and watchcase decision.

What need understand is: though the foregoing description is to the utility model detailed explanation of contrasting.But these explanations only limit to explanation of the present utility model, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation all fall in the protection domain of the present utility model.

Claims (2)

1, a kind of non-magnetic sensor measurement mechanism, it is characterized in that: two resonant tanks are made of separately inductance L and capacitor C respectively, the two ends of capacitor C are attempted by the inductance L two ends, inductance in two resonant tanks places the top of impeller, half of impeller is covered with copper or other have the metal of damping and amortization, impeller set is on impeller shaft, and the measured electrical signal of inductance connects the signal input part of built-in SCAN IF in the single-chip microcomputer in the resonant tank.

2, non-magnetic sensor measurement mechanism according to claim 1, it is characterized in that: an end of two resonant tanks, one end and capacitor C also connects the SIFCOM end of SCAN IF module, the other end ground connection of capacitor C, the other end of two resonant tanks connect the SIFCH0 and the SIHF1 end of SCAN IF module respectively.

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