CN100397057C - Radio frequency temperature inductor and temperature correction method therefor - Google Patents
Radio frequency temperature inductor and temperature correction method therefor Download PDFInfo
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- CN100397057C CN100397057C CNB2003101103897A CN200310110389A CN100397057C CN 100397057 C CN100397057 C CN 100397057C CN B2003101103897 A CNB2003101103897 A CN B2003101103897A CN 200310110389 A CN200310110389 A CN 200310110389A CN 100397057 C CN100397057 C CN 100397057C
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Abstract
The present invention relates to a radio frequency temperature sensor and a temperature correction method thereof. In the present invention, a simple circuit of the active type radio frequency temperature sensor comprising an annular oscillator, a memory, a frequency counter, a radio frequency transmission interface and a microcontroller is used for correcting and verifying the efficiency of the radio frequency temperature sensor; then, the radio frequency temperature sensor is developed into a passive type radio frequency temperature sensor comprising a rectifier, a frequency generator (Clock Extractor), an annular oscillator, a memory, a frequency counter, a modulator, a state device, etc. according to simple circuit of the active type radio frequency temperature sensor. The present invention uses the simple circuit of the active type radio frequency temperature sensor to correct and verify the efficiency of the radio frequency temperature sensor, develops the radio frequency temperature sensor into the passive type radio frequency temperature sensor which can exactly measure temperature, for causing the radio frequency temperature sensor to be suitable for application.
Description
Technical field
The present invention relates to a kind of radio frequency measuring equipment, particularly relate to a kind of radio frequency temperature inductor and temperature correction method thereof (RADIO FREQUENCY TEMPERATURE SENSOR AND TEMPERATURECABLIBRATING METHOD THEREFOR).
Background technology
In daily use, we usually can need to measure many parameters, and for example temperature, humidity, pressure etc. are not allow that we hold (as the racing car tire pressure in driving fast) that a measuring instrument directly measures determinand and many occasions are arranged.Therefore, the numerical value that can accurately measure needs, the radio frequency application circuit that can obtain the result again in remote is exactly necessary.In the design of the radio circuit of this class, we can be added on the assembly of many measurements outward in the application circuit, be used for measuring as temperature, humidity, pressure and other parameters, again measure the result, the mode of application radio frequency is sent.
In the measuring equipment of these different categories, we directly develop a radio frequency IC often, by changing its relevant application circuit, obtain and verify our needed function again.Yet this kind way is but quite consuming time and can waste many money, and often can not determine whether used transmission mode and transmission usefulness may meet the needs of design.
This shows that above-mentioned existing radio frequency temperature inductor and temperature correction method thereof still have many defectives, and demand urgently further being improved.In order to solve the defective of existing radio frequency temperature inductor and temperature correction method thereof, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but does not see always that for a long time suitable design finished by development, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing radio frequency temperature inductor and temperature correction method thereof exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of new radio frequency temperature inductor and temperature correction method thereof, can improve general existing radio frequency temperature inductor and temperature correction method thereof, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing radio frequency temperature inductor and temperature correction method thereof exist, and provide a kind of new radio frequency temperature inductor and temperature correction method thereof, technical matters to be solved is to make it can be by the ball bearing made using of an active radio frequency temperature inductor, proofread and correct and verify the usefulness of radio frequency temperature inductor, and but exploitation according to this becomes the passive radio frequency temperature inductor of accurately measuring temperature, thereby be suitable for practicality more, and have the value on the industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of radio frequency temperature inductor that the present invention proposes, it comprises: an annular oscillator, in order to produce frequency along with a measuring temperature changes and a concussion signal of change; One memory body is in order to store this frequency counting initial value of a frequency counting initial value corresponding to a preset temperature; One frequency counter couples this memory body and this annular oscillator, in order to according to this frequency counting initial value and this concussion signal, in a Preset Time scope, by the temperature deviation value of this frequency counter counting corresponding to this measuring temperature and this preset temperature; One radio frequency transmission interface is in order to the transmission interface of conduct with a card reader; An and microcontroller, couple this frequency counter, this memory body and this radio frequency transmission interface, in order to this frequency counting initial value being loaded this frequency counter, control the initial of this Preset Time scope and finish and read this temperature deviation value, and come and this card reader communication via this radio frequency transmission interface.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid radio frequency temperature inductor, wherein said annular oscillator comprises: a thermistor has one first end and one second end; One electric capacity has one first end and one second end, and this first end couples this second end of this thermistor, this second end ground connection; One Schmidt reverser has an input end and an output terminal, and this input end couples this second end of this thermistor; One phase inverter has an input end and an output terminal, and this input end couples this output terminal of this Schmidt reverser; An and Sheffer stroke gate, have a first input end, one second input end and an output terminal, this first input end is in order to receive an activation signal, and this output terminal couples this first end of this thermistor, this second input end couples this output terminal of this phase inverter, and in order to export this concussion signal.
Aforesaid radio frequency temperature inductor, wherein said memory body are a non-volatility memory.
Aforesaid radio frequency temperature inductor, wherein said frequency counter is counter.
Aforesaid radio frequency temperature inductor, wherein said radio frequency transmission interface comprises: an antenna is composed in parallel by an inductance and an electric capacity; One diode, the anode tap of this diode couple an end of this antenna; And a zener diode, the anode tap of this zener diode couples the other end of this antenna, and cathode terminal couples the cathode terminal of this diode.
Aforesaid radio frequency temperature inductor, wherein said microcontroller is converted to this measuring temperature according to a temperature corresponding tables with this temperature deviation value.
Aforesaid radio frequency temperature inductor, wherein it is a general I/O port of using this microcontroller, comes and this card reader communication.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.A kind of temperature correction method according to the present invention's proposition, be applicable to a radio frequency temperature inductor that comprises an annular oscillator, a memory body and a frequency counter at least, this method comprises the following steps: to use this annular oscillator and produces a concussion signal relevant with a standard measuring temperature; According to this concussion signal, measure the frequency count of this frequency counter in a Preset Time scope; And this frequency count is stored in this memory body, with a frequency counting initial value as this frequency counter.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.According to a kind of radio frequency temperature inductor that the present invention proposes, it comprises: a rectifier in order to obtaining the electric current of antenna concussion, and transfers the required voltage of this radio frequency temperature inductor work to; One frequency generator is in order to obtain the required clock pulse of this radio frequency temperature inductor work from this antenna; One annular oscillator is in order to produce frequency along with a measuring temperature changes and a concussion signal of change; One memory body, in order to store a frequency counting initial value, this frequency counting initial value is corresponding to a preset temperature; One frequency counter couples this memory body and this annular oscillator, in order to according to this frequency counting initial value and this concussion signal, in a Preset Time scope, by the temperature deviation value of this frequency counter counting corresponding to this measuring temperature and this preset temperature; One modulator is in order to the transmission interface of conduct with a card reader; An and stater, couple this frequency counter, this memory body and this modulator, in order to this frequency counting initial value being loaded this frequency counter, control the initial of this Preset Time scope and finish and read this temperature deviation value, and come and this card reader communication via this modulator.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid radio frequency temperature inductor, wherein said annular oscillator comprises: a thermistor has one first end and one second end; One electric capacity has one first end and one second end, and this first end couples this second end of this thermistor, this second end ground connection; One Schmidt reverser has an input end and an output terminal, and this input end couples this second end of this thermistor; One phase inverter has an input end and an output terminal, and this input end couples this output terminal of this Schmidt reverser; An and Sheffer stroke gate, have a first input end, one second input end and an output terminal, this first input end is in order to receive an activation signal, and this output terminal couples this first end of this thermistor, this second input end couples this output terminal of this phase inverter, and in order to export this concussion signal.
Aforesaid radio frequency temperature inductor, wherein said memory body are a non-volatility memory.
Aforesaid radio frequency temperature inductor, wherein said frequency counter is counter.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The invention provides a kind of radio frequency temperature inductor.This radio frequency temperature inductor comprises: annular oscillator, memory body, frequency counter, radio frequency transmission interface and microcontroller.Wherein, annular oscillator is in order to produce the concussion signal that frequency changes along with the variation of measuring temperature.The frequency counting initial value that the memory used for storing frequency counter uses, frequency counter couples memory body and annular oscillator, in order to foundation frequency counting initial value and concussion signal, in the temperature deviation value of Preset Time scope counting corresponding to measuring temperature.The radio frequency transmission interface is in order to the transmission interface of conduct with card reader, microcontroller then couples frequency counter, memory body and radio frequency transmission interface, in order to the initial of frequency counting initial value loading frequency counter, control Preset Time scope with finish and read the temperature deviation value, and come and the card reader communication via the radio frequency transmission interface.
In one embodiment, the annular oscillator of this radio frequency temperature inductor comprises: thermistor, electric capacity, Schmidt reverser, phase inverter and Sheffer stroke gate.Wherein, thermistor and electric capacity respectively have first end and second end, and first end of electric capacity couples second end of thermistor, the second end ground connection of electric capacity.Schmidt reverser has input end and output terminal, and input end couples second end of thermistor.Phase inverter has input end and output terminal, and input end couples the output terminal of Schmidt reverser.And Sheffer stroke gate has first input end, second input end and output terminal, and first input end is in order to receive an activation signal, and output terminal couples first end of thermistor, and second input end couples the output terminal of phase inverter, and in order to export above-mentioned concussion signal.
In one embodiment, the memory body of this radio frequency temperature inductor is a non-volatility memory.
In one embodiment, the frequency counter of this radio frequency temperature inductor is counter.
In one embodiment, the radio frequency transmission interface of this radio frequency temperature inductor comprises: the antenna that is composed in parallel by an inductance and an electric capacity, the diode of the end that its anode tap couples antenna and the other end that anode tap couples antenna thereof, cathode terminal couples the zener diode of the cathode terminal of diode.
In one embodiment, the microcontroller of this radio frequency temperature inductor can be according to a temperature corresponding tables, and the temperature deviation value that frequency counter is measured is converted to the temperature that is measured.
In one embodiment, this radio frequency temperature inductor is a general I/O port of using microcontroller, comes and the card reader communication.
The present invention also provides a kind of temperature correction method, applicable to the radio frequency temperature inductor that comprises annular oscillator, memory body and frequency counter at least.This temperature correction method comprises the following steps: to use annular oscillator and produces and the relevant concussion signal of a standard measuring temperature that for example is 40 ℃; According to the concussion signal, measure the frequency count of frequency counter in a Preset Time scope; And frequency count is stored in memory body, with frequency counting initial value as frequency counter.
The present invention also provides a kind of radio frequency temperature inductor in addition, and this radio frequency temperature inductor comprises: rectifier (Regulator), frequency generator (ClockExtractor), annular oscillator, memory body, frequency counter, modulator (Modulator) and stater (State machine).Wherein, rectifier is in order to obtaining the electric current of antenna concussion, and transfers the required voltage of radio frequency temperature inductor work to.Frequency generator is in order to obtain the required clock pulse of radio frequency temperature inductor work from antenna, the annular oscillator is in order to produce the concussion signal that frequency changes along with the variation of measuring temperature, the frequency counting initial value that the memory used for storing frequency counter uses, frequency counter couples memory body and annular oscillator, in order to foundation frequency counting initial value and concussion signal, in the temperature deviation value of Preset Time scope counting corresponding to measuring temperature.Modulator is in order to the transmission interface of conduct with card reader, stater then couples frequency counter, memory body and modulator, in order to the initial of frequency counting initial value loading frequency counter, control Preset Time scope with finish and read the temperature deviation value, and come and the card reader communication via modulator.
In one embodiment, the annular oscillator of this radio frequency temperature inductor comprises: thermistor, electric capacity, Schmidt reverser, phase inverter and Sheffer stroke gate.Wherein, thermistor and electric capacity respectively have first end and second end, and first end of electric capacity couples second end of thermistor, the second end ground connection of electric capacity.Schmidt reverser has input end and output terminal, and input end couples second end of thermistor.Phase inverter has input end and output terminal, and input end couples the output terminal of Schmidt reverser.And Sheffer stroke gate has first input end, second input end and output terminal, and first input end is in order to receive an activation signal, and output terminal couples first end of thermistor, and second input end couples the output terminal of phase inverter, and in order to export above-mentioned concussion signal.
In one embodiment, the memory body of this radio frequency temperature inductor is a non-volatility memory.
In one embodiment, the frequency counter of this radio frequency temperature inductor is counter.
Via as can be known above-mentioned, the present invention is a kind of radio frequency temperature inductor and temperature correction method thereof, be ball bearing made using, proofread and correct and verify the usefulness of radio frequency temperature inductor by an active radio frequency temperature inductor that comprises annular oscillator, memory body, frequency counter, radio frequency transmission interface and microcontroller.Afterwards, exploitation according to this becomes the passive radio frequency temperature inductor that comprises rectifier (Regulator), frequency generator (ClockExtractor), annular oscillator, memory body, frequency counter, modulator (Modulator) and stater etc. again.
By technique scheme, the present invention can be by the ball bearing made using of an active radio frequency temperature inductor, proofread and correct and verify the usefulness of radio frequency temperature inductor, and but exploitation according to this becomes the passive radio frequency temperature inductor of accurately measuring temperature, thereby be suitable for practicality more, and have the value on the industry.
In sum, radio frequency temperature inductor that the present invention is special and temperature correction method thereof, have above-mentioned plurality of advantages and practical value, and in like product and method, do not see have similar structural design and method to publish or use and really genus innovation, no matter it is at product structure, bigger improvement is all arranged on method or the function, have large improvement technically, and produced handy and practical effect, and more existing radio frequency temperature inductor and temperature correction method thereof have the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a novelty, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the block schematic diagram of a kind of active radio frequency temperature inductor of the preferred embodiment according to the present invention.
Fig. 2 is a kind of annular oscillator circuit diagram of the preferred embodiment according to the present invention.
Fig. 3 is the operation waveform diagram of the radio frequency transmission interface when the preferred embodiment card reader reads data according to the present invention.
Fig. 4 is the operation waveform diagram of the radio frequency transmission interface when the preferred embodiment card reader writes data according to the present invention.
Fig. 5 is the block schematic diagram of a kind of passive radio frequency temperature inductor of the preferred embodiment according to the present invention.
100,500: radio frequency temperature inductor 110,510: annular oscillator
120,520: memory body (internal memory) 130,530: frequency counter
140: radio frequency transmission interface (interface) 141: inductance
142,220 electric capacity 143: diode
144: zener diode 150: microcontroller
200: card reader 210: thermistor
230: Schmidt reverser 240: phase inverter
250: Sheffer stroke gate (and not b gate) 540: modulator
550: stater 560: rectifier
570: frequency generator 580: antenna
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to radio frequency temperature inductor and its concrete structure of temperature correction method, method, step, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also shown in Figure 1ly, is the block schematic diagram of a kind of active radio frequency temperature inductor of the preferred embodiment according to the present invention.The radio frequency temperature inductor 100 of preferred embodiment of the present invention is by annular oscillator 110, for example is that the memory body 120 and the frequency counter 130 of non-volatile memory body waits the function of finishing measuring temp, now it is measured principle is described as follows.
At first, use annular oscillator 110 to produce the concussion signal Clock_In that frequency changes along with the variation of measuring temperature, with counting clock pulse as frequency counter 130.Annular oscillator 110 can be the oscillator that comprises thermistor 210, electric capacity 220, Schmidt reverser 230, phase inverter 240 and Sheffer stroke gate 250 as shown in Figure 2.
See also shown in Figure 2ly, thermistor 210 respectively has first end and second end with electric capacity 220, and first end of this electric capacity 220 couples second end of thermistor 210, the second end ground connection of electric capacity 220.Schmidt reverser 230 has input end and output terminal, and its input end couples second end of thermistor 210.Phase inverter 240 has input end and output terminal, and its input end couples the output terminal of Schmidt reverser 230.And Sheffer stroke gate 250 has first input end, second input end and output terminal, its first input end is in order to receive an activation signal En, output terminal couples first end of thermistor 250, to form a loop checking installation, its second input end then couples the output terminal of phase inverter 240, and the concussion signal Clock_In that changes along with the variation of measuring temperature in order to output frequency.Wherein, the frequency change of concussion signal Clock_In is because the resistance value of thermistor 250 can change along with temperature, causes due to RC difference time delay of its circuit.
Please consult again shown in Figure 1, employed commercially available thermistor in annular oscillator 110, though the error range that generally can guarantee its temperature variation constant B (B-constant) in 1%, its absolute value error has about 5%.In addition, employed commercially available electric capacity generally also has 5% error range in annular oscillator 110.So 5% thermistor error adds that 5% capacitance error just has 10% error and produces in the annular oscillator 110, as not via suitable temperature correction method, will cause the temperature value error that measured excessive.Therefore, the frequency counting initial value that the memory body 120 in the application drawing comes stored frequency counter 130 to use is to proofread and correct the thermistor in the annular oscillator 110 and the error of electric capacity.
At timing, at first use annular oscillator 110 and produce the concussion signal Clock_In relevant with the standard measuring temperature that for example is 40 ℃, according to concussion signal Clock_In, measuring the frequency count of frequency counter 130 in a Preset Time scope then, is 2800 for example.At last 2800 frequency count is stored in memory body 120, with the frequency counting initial value as frequency counter 130, therefore, in the present embodiment, the pairing preset temperature of said frequencies counting initial value is 40 ℃.。
Therefore, when actual measuring temperature, just can be with in the frequency count loading frequency counter 130 that stores in the memory body 120, and application examples is descended the frequency counter 130 of counter in this way, with in aforesaid Preset Time scope from 2800 frequency counting initial value its count value of successively decreasing, and to obtain with 40 ℃ be the temperature deviation value at center.That is to say that when equivalent thermometric degree is 40 ℃, the count value of frequency counter 130 will be 0; When equivalent thermometric degree is lower than 40 ℃,, cause the count value of frequency counter 130 will be for being lower than 0 temperature deviation value because the frequency of the concussion signal Clock_In of annular oscillator 110 is higher; And equivalent thermometric degree is when being higher than 40 ℃, because the frequency of the concussion signal Clock_In of annular oscillator 110 is lower, causes the count value of frequency counter 130 will be for being higher than 0 temperature deviation value.This temperature deviation value also can be converted into the temperature that is measured according to a temperature corresponding tables that is stored in memory body 120 or the card reader 200.Certainly, when the temperature range that measures as desire is big, in order to make measurement more accurate, several frequency counting initial values of also can taking a sample more, the scope of for example wanting to measure is 0-70 ℃, then can 0 ℃ value of amount, value of 35 ℃ of amounts, and 70 ℃ of another values of amount, the reference during for the measuring temperature deviate.
As previously mentioned, for can be by simple active radio frequency temperature inductor circuit, proofread and correct and verify the usefulness of radio frequency temperature inductor, therefore, radio frequency transmission interface 140 in the present embodiment application drawing and microcontroller 150, with finish with the initial of frequency counting initial value loading frequency counter 130, control Preset Time scope with finish and read the temperature deviation value, and via the function of radio frequency transmission interface 140 with card reader communication 200.Certainly, radio frequency temperature inductor 100 circuit among the figure are because of being to belong to authentication function to use, so its working power is to be provided by an external power source (not shown) that for example is battery.In addition, its microcontroller 150 is for generally containing the microcontroller of general port,input-output GPIO, so that via the general I/O port GPIO of microcontroller 150, come and card reader 200 communications.Now its Principle of Communication is described as follows.
In Fig. 1, its radio frequency transmission interface 140 comprises: the antenna that composes in parallel by an inductance 141 and an electric capacity 142, the diode 143 of the end that its anode tap couples antenna and the other end that anode tap couples antenna thereof, and cathode terminal couples the zener diode 144 of the cathode terminal of diode 143.
Wherein, should set the value of inductance 141 and electric capacity 142, make its resonant frequency (Resonancefrequency) identical with carrier frequency (Carrier frequency).When resonance took place, its antenna other end can produce the AC signal of string ripple (sinusoid).Because of the string ripple is positive voltage sometimes, sometimes be negative voltage, if this end of antenna is directly received the general port,input-output GPIO of microcontroller 150, then when antenna end is negative voltage, meeting is released electric current from the general port,input-output GPIO of microcontroller 150, and causes the latch up effect (latch-up effect) of circuit.Therefore, must use diode 143 that negative voltage is partly filtered, just receive the general port,input-output GPIO of microcontroller 150 afterwards.
In addition, when the distance of antenna and card reader 200 was near more, its voltage of sensing also can be big more.At this moment, if the voltage of induction does not limit, when antenna when the certain distance, the induced voltage that is produced is easy to surpass the disruptive voltage (Breakdown voltage) of microcontroller 150 internal transistor assemblies, cause the damage of assembly or work undesired.Therefore, must use the maximal value that zener diode (Zener diode) comes strangulation (clamp) voltage, to prevent the damage of assembly.
Seeing also shown in Figure 3ly, is the operation waveform diagram of the radio frequency transmission interface when the preferred embodiment card reader reads data according to the present invention.Generally speaking, can come easily the general port,input-output GPIO of microcontroller 150 to be set in output electronegative potential three states such as (outputlow) variation of pull down resistor (pull low resistor) with the output mode of suspension joint (floating), input pattern via the register values that changes microcontroller 150.In this three state changed, the equivalent resistance of being seen by radio frequency transmission interface 140 was the highest with suspension joint, was the pull down resistor of input pattern secondly, was the output electronegative potential of output mode secondly again.Therefore, can utilize the variation of different resistance values, change the amplitude of the carrier wave that card reader 200 sends, reach the purpose of transmission data to card reader 200.
In Fig. 1, when card reader 200 is sent carrier wave, and radio frequency temperature inductor 100 is during near card reader 200, and the antenna of radio frequency transmission interface 140 begins to sense energy and resonates, and at this moment, can see the string ripple at the antenna winding terminal.Suppose that the signal that radio frequency temperature inductor 100 will transmit is 101001, then microcontroller 150 can be set at suspension joint, pull down resistor, suspension joint, pull down resistor, pull down resistor, suspension joint etc. with general port,input-output GPIO in regular turn.Therefore, the waveform of the general I/O port GPIO of the antenna end of radio frequency transmission interface 140, microcontroller 150 end and the accurate position of its logic, with respectively shown in the (a) and (b) among Fig. 3, (c), thus can be successfully with data transmission to card reader 200.Certainly,, as have the knack of known to this skill person though above-mentionedly operate with suspension joint and pull down resistor, three states such as suspension joint, pull down resistor and output electronegative potential optional its two, be the feasible practice.
Seeing also shown in Figure 4ly, is the operation waveform diagram of the radio frequency transmission interface when the preferred embodiment card reader writes data according to the present invention.When card reader 200 write operations, need earlier the general I/O port GPIO of microcontroller 150 to be set at the pull down resistor of input pattern, send waveform by card reader 200 then as Fig. 4 (a).That is to say, the time and the string wave-amplitude arranged, the time and do not have a string wave-amplitude, transmit the accurate position 1 and 0 of logic with representative respectively.At this moment, the antenna induction of radio frequency temperature inductor 100 is to the waveform of bringing, and produces waveform as Fig. 4 (b) through the filtering of diode 143.The stray capacitance of general port,input-output GPIO end of supposing microcontroller 150 is enough big, then the waveform of the general port,input-output GPIO end of microcontroller 150 will be shown in Fig. 4 (c), and as the stray capacitance of the general port,input-output GPIO end of microcontroller 150 when big inadequately, also can add an electric capacity, make the waveform of the general port,input-output GPIO end of microcontroller 150 can be shown in Fig. 4 (c) at the general port,input-output GPIO of microcontroller 150 end.Therefore, microcontroller 150 needs only the voltage of its general I/O port GPIO end of timing sampling, and the logical signal that card reader 200 can be sent reduces shown in Fig. 4 (d), so can finish the purpose that data is write radio frequency temperature inductor 100 smoothly.
Above explanation is the design in order to a kind of active radio frequency temperature inductor of authentication function, and why being called active is to use as the external power source of battery etc. event of powering because of it.After functional verification is finished, circuit must be changed into a passive radio frequency IC, just there is not the radio frequency IC of additional power source, then its circuit will be as shown in Figure 5.
See also shown in Figure 5ly, this radio frequency temperature inductor 500 comprises: rectifier (Regulator) 560, frequency generator (Clock Extractor) 570, annular oscillator 510, memory body 520, frequency counter 530, modulator (Modulator) 540 and stater (State machine) 550.Wherein, because of no additional power source, thus must use the electric current that rectifier 560 is obtained antenna 580 concussions, and transfer the required voltage of radio frequency temperature inductor 500 work to.In addition, must come to obtain the required clock pulse of radio frequency temperature inductor 500 work by applying frequency generator 570 from antenna 580, application modulator 540 is used as the transmission interface with card reader 200, and application state device 550 will be stored in frequency counting initial value loading frequency counter 530 in the memory body 520, control counting with the initial of Preset Time scope with end and read the temperature deviation value, and via modulator 540 and card reader 200 communications, to replace the function of the microcontroller 150 among Fig. 1.Certainly, the annular oscillator 510 among the figure, memory body 520 are all identical with Fig. 1 with the function of frequency counter 530, so repeat no more.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (12)
1. radio frequency temperature inductor is characterized in that it comprises:
One annular oscillator is in order to produce frequency along with a measuring temperature changes and a concussion signal of change;
One memory body, in order to store a frequency counting initial value, this frequency counting initial value is corresponding to a preset temperature;
One frequency counter couples this memory body and this annular oscillator, in order to according to this frequency counting initial value and this concussion signal, in a Preset Time scope, by the temperature deviation value of this frequency counter counting corresponding to this measuring temperature and this preset temperature;
One radio frequency transmission interface is in order to the transmission interface of conduct with a card reader; And
One microcontroller, couple this frequency counter, this memory body and this radio frequency transmission interface, in order to this frequency counting initial value being loaded this frequency counter, control the initial of this Preset Time scope and finish and read this temperature deviation value, and come and this card reader communication via this radio frequency transmission interface.
2. radio frequency temperature inductor according to claim 1 is characterized in that wherein said annular oscillator comprises:
One thermistor has one first end and one second end;
One electric capacity has one first end and one second end, and this first end couples this second end of this thermistor, this second end ground connection;
One Schmidt reverser has an input end and an output terminal, and this input end couples this second end of this thermistor;
One phase inverter has an input end and an output terminal, and this input end couples this output terminal of this Schmidt reverser; And
One Sheffer stroke gate, have a first input end, one second input end and an output terminal, this first input end is in order to receive an activation signal, and this output terminal couples this first end of this thermistor, this second input end couples this output terminal of this phase inverter, and in order to export this concussion signal.
3. radio frequency temperature inductor according to claim 1 is characterized in that wherein said memory body is a non-volatility memory.
4. radio frequency temperature inductor according to claim 1 is characterized in that wherein said frequency counter is counter.
5. radio frequency temperature inductor according to claim 1 is characterized in that wherein said radio frequency transmission interface comprises:
One antenna is composed in parallel by an inductance and an electric capacity;
One diode, the anode tap of this diode couple an end of this antenna; And
One zener diode, the anode tap of this zener diode couples the other end of this antenna, and cathode terminal couples the cathode terminal of this diode.
6. radio frequency temperature inductor according to claim 1 is characterized in that wherein said microcontroller according to a temperature corresponding tables, is converted to this measuring temperature with this temperature deviation value.
7. radio frequency temperature inductor according to claim 1 is characterized in that it wherein being a general I/O port of using this microcontroller, comes and this card reader communication.
8. a temperature correction method is applicable to a radio frequency temperature inductor that comprises an annular oscillator, a memory body and a frequency counter at least, it is characterized in that this method comprises the following steps:
Use this annular oscillator and produce a concussion signal relevant with a standard measuring temperature;
According to this concussion signal, measure the frequency count of this frequency counter in a Preset Time scope; And
This frequency count is stored in this memory body, with a frequency counting initial value as this frequency counter.
9. radio frequency temperature inductor is characterized in that it comprises:
One rectifier in order to obtaining the electric current of antenna concussion, and transfers the required voltage of this radio frequency temperature inductor work to;
One frequency generator is in order to obtain the required clock pulse of this radio frequency temperature inductor work from this antenna;
One annular oscillator is in order to produce frequency along with a measuring temperature changes and a concussion signal of change;
One memory body, in order to store a frequency counting initial value, this frequency counting initial value is corresponding to a preset temperature;
One frequency counter couples this memory body and this annular oscillator, in order to according to this frequency counting initial value and this concussion signal, in a Preset Time scope, by the temperature deviation value of this frequency counter counting corresponding to this measuring temperature and this preset temperature;
One modulator is in order to the transmission interface of conduct with a card reader; And
One stater, couple this frequency counter, this memory body and this modulator, in order to this frequency counting initial value being loaded this frequency counter, control the initial of this Preset Time scope and finish and read this temperature deviation value, and come and this card reader communication via this modulator.
10. radio frequency temperature inductor according to claim 9 is characterized in that wherein said annular oscillator comprises:
One thermistor has one first end and one second end;
One electric capacity has one first end and one second end, and this first end couples this second end of this thermistor, this second end ground connection;
One Schmidt reverser has an input end and an output terminal, and this input end couples this second end of this thermistor;
One phase inverter has an input end and an output terminal, and this input end couples this output terminal of this Schmidt reverser; And
One Sheffer stroke gate, have a first input end, one second input end and an output terminal, this first input end is in order to receive an activation signal, and this output terminal couples this first end of this thermistor, this second input end couples this output terminal of this phase inverter, and in order to export this concussion signal.
11. radio frequency temperature inductor according to claim 9 is characterized in that wherein said memory body is a non-volatility memory.
12. radio frequency temperature inductor according to claim 9 is characterized in that wherein said frequency counter is counter.
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| CNB2003101103897A CN100397057C (en) | 2003-12-30 | 2003-12-30 | Radio frequency temperature inductor and temperature correction method therefor |
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| CNB2003101103897A CN100397057C (en) | 2003-12-30 | 2003-12-30 | Radio frequency temperature inductor and temperature correction method therefor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5873831A (en) * | 1981-10-27 | 1983-05-04 | Omron Tateisi Electronics Co | Electronic thermometer |
| US4471354A (en) * | 1981-11-23 | 1984-09-11 | Marathon Medical Equipment Corporation | Apparatus and method for remotely measuring temperature |
| USH1744H (en) * | 1995-09-21 | 1998-08-04 | Clayton; Stanley R. | Wireless remote sensing thermometer |
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2003
- 2003-12-30 CN CNB2003101103897A patent/CN100397057C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5873831A (en) * | 1981-10-27 | 1983-05-04 | Omron Tateisi Electronics Co | Electronic thermometer |
| US4471354A (en) * | 1981-11-23 | 1984-09-11 | Marathon Medical Equipment Corporation | Apparatus and method for remotely measuring temperature |
| USH1744H (en) * | 1995-09-21 | 1998-08-04 | Clayton; Stanley R. | Wireless remote sensing thermometer |
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| CN1635350A (en) | 2005-07-06 |
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