CN207867365U - A kind of RFID reader for cold environment - Google Patents
A kind of RFID reader for cold environment Download PDFInfo
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- CN207867365U CN207867365U CN201721880452.9U CN201721880452U CN207867365U CN 207867365 U CN207867365 U CN 207867365U CN 201721880452 U CN201721880452 U CN 201721880452U CN 207867365 U CN207867365 U CN 207867365U
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Abstract
The utility model is related to a kind of RFID readers for cold environment, circuit unit including cabinet and the realization RFID reader function being arranged in the cabinet further includes being arranged that the temperature in chassis is maintained to be maintained at the heat-generating units being suitable in the range of electronic device works in the cabinet；The heat-generating units include temperature acquisition and control module and the heating module by the temperature acquisition and control module control；When its collected temperature in chassis value is less than heating threshold value, output control signal makes the heating module generate heat for the temperature acquisition and control module；And in its collected temperature in chassis value higher than stopping output control signal when stopping heating threshold value so that the heating module stops fever.A kind of RFID reader for cold environment for implementing the utility model, has the advantages that：It can keep readwrite performance, use environment can not be limited in cold environments.
Description
Technical field
The utility model is related to field of radio frequency identification, more specifically to a kind of RFID read-write for cold environment
Device.
Background technology
Radio frequency identification (RFID) technology is a kind of non-contacting Radio Frequency Identification Technology, it is to utilize wireless radio frequency mode
Non-contact bidirectional data communication is carried out, to achieve the purpose that target identification and exchange data.The application of RFID technique at present with push away
Wide to have reached its maturity with extensively, it is more important that RFID reader wireless communication data acquires function.RFID reader at normal temperatures
Typical performance be read-write card reading/writing distance, read-write card performance will appear at low ambient temperatures to be declined to a certain degree.By right
Reader carries out low temperature environment test, it is found that reader also follows continuous deterioration as temperature constantly reduces read-write card performance, lead
Cause cannot finally meet practical application request.For example, under -40 DEG C of temperature environments reader read-write card reading/writing distance will under
50% or so of test read-write card reading/writing distance under only room temperature is dropped to, it is even more.The main reason for causing these problems has,
Electronic component performance failure in reader at low ambient temperatures, will cause reader not start normally；Reader radio frequency is sent out
Channel radio frequency parameter output abnormality at low ambient temperatures is penetrated, such as transmitter phase noise penalty is leaked to the noise signal of receiver
Receiver sensitivity is caused to reduce；Transmitting signal modulation deterioration causes label demodulation abnormal；Or it is demodulated in receiver circuit
The reasons such as device and the decline of zero intermediate frequency signals process performance.Therefore, in the prior art, there are read and write under low temperature (or cold) environment
The problem of device reduced performance, makes its use environment be subject to certain restrictions.
Utility model content
The technical problem to be solved by the present invention is under readwrite performance under the above-mentioned cold environment of the prior art
The defect that drop, use environment are subject to certain restrictions, readwrite performance, use environment can be kept in cold environments by providing one kind
A kind of RFID reader for cold environment that can not be limited.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of RFID for cold environment
Reader includes the circuit unit of cabinet and the realization RFID reader function being arranged in the cabinet, further includes that setting exists
The temperature in chassis is maintained to be maintained at the heat-generating units being suitable in the range of electronic device work in the cabinet；It is described
Heat-generating units include temperature acquisition and control module and the heating module by the temperature acquisition and control module control；It is described
When its collected temperature in chassis value is less than heating threshold value, output control signal makes institute for temperature acquisition and control module
State heating module fever；And in its collected temperature in chassis value higher than stopping output control letter when stopping heating threshold value
Number so that the heating module stops fever.
Further, the temperature acquisition and control module include multiple temperature sensors, it is multiple respectively processing described in
Temperature sensor output signal and sensor signal acquisition unit corresponding with the temperature sensor quantity and processing are more
The sensor signal of a sensor signal acquisition unit output and export fever control signal to the heat-generating units hair
Thermal control signal generation unit.
Further, the multiple temperature sensor includes the computer heating control of environment temperature in an acquisition cabinet
Sensor, one stop heating sensor and it is multiple be separately positioned on the reader important devices nearby, respectively acquire it is each heavy
Want the device temperature sensor of component surrounding environment temperature.
Further, the sensor signal acquisition unit includes signal amplification circuit, comparison circuit and state delay
Circuit；The sensor signal for the temperature sensor output that the signal amplification circuit connects is amplified, and is input to described
Comparison circuit and the threshold value of setting are compared and export comparison result, and it is electric that the state delay is electrically connected to the comparison
The output end on road maintains the output of the comparison circuit not to be mutated in setting time.
Further, the state delay circuit includes charge-discharge circuit, and the charging and discharging time respectively represents this
Signal holding time from scratch and from having nothing.
Further, the fever controls signal generation unit with the output of the multiple sensor processing unit
Signal generates fever control signal as input to the logical operation that the multiple input signal is set.
Further, the heating module includes heater and drives the drive module of the heater；The driving
Module receives the fever and controls signal, and controls signal according to the fever and generate drive waveforms, and the heater is driven to send out
Heat stops fever.
Further, the drive module by AC-input voltage directly or separately through the direct current generated after transformation
Pressure power supply.
Further, the temperature sensor is arranged by sensor stand in the space of the corresponding position of the cabinet
Interior, the computer heating control sensor and stopping heating sensor being separately positioned on the heat obtained by calorimetric analysis in the cabinet
Measure minimum and highest position.
Further, the installation position of the device temperature sensor includes that the radio-frequency transmissions of the RFID reader are logical
In space near road, demodulator, frequency mixer and local oscillator.
A kind of RFID reader for cold environment for implementing the utility model, has the advantages that：Due to
It is provided with heat-generating units in cabinet, and the heat-generating units maintain the temperature in the cabinet to be suitable for the work temperature of electronic device
Degree, therefore, even if under more extreme cold environment temperature, as long as not powering off, the temperature in cabinet can protect substantially
It holds and readwrite performance is being made not decline or decline in few range so that the RFID reader can work normally；Meanwhile
In the case of laser heating, once temperature rise to setting range, can also stop heating, the excessively high influence brought of temperature is avoided,
So housing temperature can be maintained automatically in cold environments.Therefore, readwrite performance can be kept in cold environments, used
Environment can not be limited.
Description of the drawings
Fig. 1 is the structural representation of heat-generating units in a kind of RFID reader embodiment for cold environment of the utility model
Figure；
Fig. 2 is temperature acquisition and the structural schematic diagram of control module in the embodiment；
Fig. 3 is the structural schematic diagram of a sensor processing unit in the embodiment.
Specific implementation mode
The utility model embodiment is described further below in conjunction with attached drawing.
It as depicted in figs. 1 and 2, should in a kind of RFID reader embodiment for cold environment of the utility model
RFID reader includes the circuit unit of cabinet and the realization RFID reader function being arranged in the cabinet, further includes setting
The temperature in chassis is maintained to be maintained at the heat-generating units being suitable in the range of electronic device works in the cabinet；Institute
It includes temperature acquisition and control module and the heating module by the temperature acquisition and control module control to state heat-generating units；Institute
Temperature acquisition and control module are stated when its collected temperature in chassis value is less than heating threshold value, output control signal makes
The heating module fever；And in its collected temperature in chassis value higher than stopping output control letter when stopping heating threshold value
Number so that the heating module stops fever.The temperature acquisition and control module include multiple temperature sensors, multiple difference
Handle the temperature sensor output signal and sensor signal acquisition unit corresponding with the temperature sensor quantity with
And it handles the sensor signal of multiple sensor signal acquisition unit outputs and exports fever control signal to the fever
The fever of unit controls signal generation unit.The multiple temperature sensor includes environment temperature in an acquisition cabinet
Computer heating control sensor, one stop heating sensor and it is multiple be separately positioned on the reader important devices nearby, respectively
Acquire the device temperature sensor of each important component surrounding environment temperature.The installation position of the device temperature sensor includes institute
It states in the space near radio frequency transmitting channel, demodulator, frequency mixer and the local oscillator of RFID reader.
It is the temperature value detected with temperature sensor whether the startup of heating module that is, in the present embodiment
It is relevant, and these temperature sensor signals are multichannels, it is relevant with the position of sensor.Wherein, temperature sensing all the way
It is heating that whether device signal deciding heating module, which is opened, and the temperature value that another way temperature sensor detects determines heated mould
Whether block, which stops, being heated.The two temperature sensors obtain temperature value and by it compared with threshold value, the difference is that door
Limit value is different and the content that compares is different, is determining temperature sensor that whether heating module begins to warm up and its follow-up
Circuit in, the threshold value that participates in comparing is heating threshold value, and the content compared is whether the temperature value obtained is less than the thresholding
Value；And in the temperature sensor and its subsequent conditioning circuit whether decision module stops heating, the threshold value for participating in comparing is off
Threshold value is heated, the content compared is to compare sensor to obtain whether temperature value is higher than the threshold value.It is apparent that stopping heated door
The temperature that limit value indicates is higher than the temperature that the above-mentioned threshold value begun to warm up indicates.In most cases, above-mentioned two thresholding
The temperature that value indicates is respectively at the both ends for the temperature region that can ensure electronic device normal work.In addition, Primary Component is attached
The comparison threshold value of close device temperature sensor output signal be also requirement when being worked according to the device to environment temperature and
Setting, the lower limiting value of its environment temperature can be set, and it is to judge whether to be less than the value, and then control heated mould to compare content
The unlatching of block；It can also be set and be the upper limit value of operating ambient temperature, and it is to judge whether to be more than the value to compare content, in turn
Control the closing of heating module；Two-way temperature sensor can also be set near a Primary Component, control heated mould all the way
Block is opened, and another way controls its closing etc..
In the present embodiment, Fig. 3 is referred to, the sensor signal acquisition unit includes that signal amplification circuit, comparison are electric
Road and state delay circuit；The sensor signal for the temperature sensor output that the signal amplification circuit connects is put
Greatly, the threshold value for being input to the comparison circuit and setting is compared and exports comparison result, and the state delay circuit connects
It is connected on the output end of the comparison circuit, the output of the comparison circuit is maintained not to be mutated in setting time.The state
Delay circuit includes charge-discharge circuit, is charged and discharged the time and respectively represents the signal from scratch and from the maintenance having to nothing
Time.
The characteristic of temperature and the characteristic of variation of ambient temperature are obtained due to temperature sensor, in fact it could happen that sensor exports
The signal of expression temperature value the case where being in the edge of some thresholding, such as occur interfering etc..In this case, finally
May occur controlling the frequent saltus step of signal appearance or oscillation when being embodied on control signal, so that above-mentioned heating module
The frequent switching between heating and stopping heating.This can be that electronic device, especially power electronic device bring damage.In order to keep away
Exempt from the appearance of such case, in the present embodiment, is provided with above-mentioned state delay circuit so that sensor output signal is certain
Time in maintain its preceding state, frequent conversion or saltus step are not will produce, to play the role of protecting device.
In the present embodiment, as shown in Fig. 2, the fever control signal generation unit with the multiple sensor signal at
The output signal for managing unit generates fever control letter as input to the logical operation that the multiple input signal is set
Number.That is, in the present embodiment, final control signal is not merely the signal deciding exported by a temperature sensor
, in fact, control signal is certain logical operation of the output signal of multiple temperature sensors as a result, final decisions exports
Control signal state.
In addition, in the present embodiment, the heating module includes heater and drives the drive module of the heater；Institute
It states drive module and receives the fever control signal, and signal is controlled according to the fever and generates drive waveforms, drive the hair
Hot body fever stops fever.The drive module is by AC-input voltage directly or separately through the direct current generated after transformation
Pressure power supply.The benefit being arranged in this way is will can to add thermogenetic interference and the function of energy expenditure and RFID reader point as possible
It opens, between the two influencing each other is made to drop to acceptable degree
In addition, in order to accurately obtain cabinet air temperature value (or ambient temperature value), the temperature sensor as possible
It is arranged in the space of the corresponding position of the cabinet by sensor stand, the computer heating control sensor and stopping heating passing
Sensor is separately positioned on the minimum and highest position of heat obtained by calorimetric analysis in the cabinet.It can make machine in this way
Temperature in case is suitable for electronic device.Meanwhile device sensors are also to be arranged near device by holder, induction
It is the ambient temperature value near device, rather than the temperature value of device itself.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of RFID reader for cold environment, including cabinet and the realization RFID reader that is arranged in the cabinet
The circuit unit of function, which is characterized in that further include that setting maintains the temperature in chassis to be maintained at one in the cabinet
Heat-generating units in the range of working suitable for electronic device；The heat-generating units include temperature acquisition and control module and by institute
State the heating module of temperature acquisition and control module control；The temperature acquisition and control module are warm in its collected cabinet
When angle value is less than heating threshold value, output control signal makes the heating module generate heat；And it is warm in its collected cabinet
Angle value exports control signal higher than stopping when stopping heating threshold value so that the heating module stops fever.
2. the RFID reader according to claim 1 for cold environment, which is characterized in that the temperature acquisition and control
Molding block include multiple temperature sensors, it is multiple handle respectively the temperature sensor output signal and with the temperature sensor
The corresponding sensor signal acquisition unit of quantity and the sensor of the multiple sensor signal acquisition unit outputs of processing
Signal and export fever control signal to the heat-generating units fever control signal generation unit.
3. the RFID reader according to claim 2 for cold environment, which is characterized in that the multiple temperature sensing
Device includes computer heating control sensor, a stopping heating sensor and the multiple difference of environment temperature in an acquisition cabinet
It is arranged near the reader important devices, acquires the device temperature sensor of each important component surrounding environment temperature respectively.
4. the RFID reader according to claim 3 for cold environment, which is characterized in that the sensor signal takes
It includes signal amplification circuit, comparison circuit and state delay circuit to obtain unit；The temperature that the signal amplification circuit connects
The sensor signal of sensor output is amplified, and the threshold value for being input to the comparison circuit and setting is compared and exports
Comparison result, the state delay are electrically connected to the output end of the comparison circuit, and the output of the comparison circuit is maintained to exist
It will not be mutated in setting time.
5. the RFID reader according to claim 4 for cold environment, which is characterized in that the state delay circuit
Including charge-discharge circuit, the charging and discharging time respectively represents the signal holding time from scratch and from having nothing.
6. the RFID reader according to claim 5 for cold environment, which is characterized in that the fever controls signal
Unit is generated using the output signal of the multiple sensor processing unit as input, the multiple input signal is carried out
The logical operation of setting generates fever control signal.
7. the RFID reader according to claim 6 for cold environment, which is characterized in that the heating module includes
Heater and the drive module for driving the heater；The drive module receives the fever and controls signal, and according to described
Fever control signal generates drive waveforms, drives the heater fever or stops fever.
8. the RFID reader according to claim 7 for cold environment, which is characterized in that the drive module is by handing over
Input voltage is flowed directly or separately through the DC-voltage supply generated after transformation.
9. the RFID reader according to claim 8 for cold environment, which is characterized in that the temperature sensor is logical
It crosses sensor stand to be arranged in the space of the corresponding position of the cabinet, the computer heating control sensor and stopping heating sensing
Device is separately positioned on the minimum and highest position of heat obtained by calorimetric analysis in the cabinet.
10. the RFID reader according to claim 9 for cold environment, which is characterized in that the device temperature passes
The installation position of sensor includes near radio frequency transmitting channel, demodulator, frequency mixer and the local oscillator of the RFID reader
Space in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721880452.9U CN207867365U (en) | 2017-12-28 | 2017-12-28 | A kind of RFID reader for cold environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721880452.9U CN207867365U (en) | 2017-12-28 | 2017-12-28 | A kind of RFID reader for cold environment |
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| Publication Number | Publication Date |
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| CN207867365U true CN207867365U (en) | 2018-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721880452.9U Active CN207867365U (en) | 2017-12-28 | 2017-12-28 | A kind of RFID reader for cold environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118095325A (en) * | 2024-04-23 | 2024-05-28 | 青岛儒海船舶工程有限公司 | High concurrency RFID read-write system and device suitable for cold chain logistics |
-
2017
- 2017-12-28 CN CN201721880452.9U patent/CN207867365U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118095325A (en) * | 2024-04-23 | 2024-05-28 | 青岛儒海船舶工程有限公司 | High concurrency RFID read-write system and device suitable for cold chain logistics |
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