CN107092846A - A kind of reader of automatic switch power realizes device - Google Patents
A kind of reader of automatic switch power realizes device Download PDFInfo
- Publication number
- CN107092846A CN107092846A CN201710203847.3A CN201710203847A CN107092846A CN 107092846 A CN107092846 A CN 107092846A CN 201710203847 A CN201710203847 A CN 201710203847A CN 107092846 A CN107092846 A CN 107092846A
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- Prior art keywords
- power
- alarm
- signal
- automatic switch
- reader
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10198—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes
- G06K7/10217—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes parameter settings controlling the transmission power of the interrogator
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
Device is realized the invention provides a kind of reader of automatic switch power, including：Forward signal generating unit, for providing tone signal required during detection standing wave；Forward and reverse power collecting unit, for respectively extract obtaining forward power and backward power forward signal and reverse signal；Power detecting unit, calculates two inputs that comparator is input to after corresponding magnitude of voltage, comparator output comparative result；Automatic switch power cell, receives the output valve of comparator, carries out logical process by PLD, realizes before automatic switch to power amplifier.The present invention realizes that power amplifier automatically shuts down unlatching, and power amplifier can be automatically shut down after alarm, and detection is also may proceed to after releasing manually until vswr protection normally can just automatically open up power amplifier.
Description
Technical field
The invention belongs to reader technology field, device is realized more particularly, to a kind of reader of automatic switch power.
Background technology
RFID integrated systems include the software and hardware products such as reader, label, antenna, middleware, application system.Work as reader
Energy is sent to label by antenna and data constitute forward link, label is connected to progress processing after energy and again passes by reader
Antenna return information constitutes reverse link to reader, realizes digital independent.Standing wave refers to that frequency is identical, transmission direction is opposite
A kind of distribution that two kinds of ripples are formed along transmission line, one of ripple is the back wave of another ripple, this easy shape of standing wave
Into energy accumulation, the normal transmission of normal signal is hindered.Forward power will be complete when antenna is not in place for our equipment reader
Portion is reflexed in reverse link, causes the infringement of radio frequency link, such case we be referred to as standing wave alarm.
We is prevent standing wave infringement from would generally design standing-wave protecting circuit at present, and standing-wave protecting circuit is typically using orientation
Backward power carries out power detection before coupler is gathered out, but because antenna load change can cause backward power before detecting to have partially
Difference, has higher requirement to the isolation of coupler；Moreover, overall power amplifier switching function also imperfection, it is impossible to which realization is opened automatically
Close power amplifier.
The content of the invention
In view of this, the present invention is directed to propose a kind of reader of automatic switch power realizes device, with by opening automatically
Closing forward power prevents standing wave alarm from causing the damage of link power amplifier.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of reader of automatic switch power realizes device, including：
Forward signal generating unit, for providing tone signal required during detection standing wave；
Forward and reverse power collecting unit, obtains preceding to work(for carrying out extracting forward signal and reverse signal respectively
Rate and backward power；
Power detecting unit, including two power detectors and a comparator, two power detectors be respectively used to by
The forward power and backward power of reception are input to comparator after calculating corresponding magnitude of voltage according to certain non-linear relation
Two inputs, comparator output comparative result；
Automatic switch power cell, receives the output valve of comparator, and logical process is carried out by PLD, real
To power amplifier before existing automatic switch, while carrying out real-time standing wave alarm by Alarm Unit.
Further, after power detecting unit detects standing wave exception, standing wave alarm signal is enabled, it is described afterwards automatic
The PLD of switch power unit realizes following logic control function：Standing wave alarm signal is stored in interrupt register
In, wherein, the interrupt register updates alarm register by phase inverter with feedback after the progress of alarm register or computing
Data, the alarm register control alarm lamp is opened, and the alarm register is used for the control signal for storing control alarm lamp；
The PLD closed according to the data of alarm register before to power amplifier, the data of rear renewal interrupt register.
Further, order can be sent by host computer, makes PLD forcibly changing alarm register data,
Extinguish alarm lamp.
Further, the power amplifier electricity that the standing wave testing result of the output of the automatic switch power cell is sent with host computer
Source control signal is by with controlling the preceding switch to power amplifier after computing.
Further, the forward and reverse power collecting unit includes coupler and circulator, described coupler one end
It is connected with the day line options and matching unit of reader, other end connection circulator；Pass through the coupler and circulator group of orientation
Forward signal and reverse signal respectively extract obtaining forward power and backward power by conjunction.
Further, the tone signal of the forward signal generating unit output passes through the output matching net of reader power amplifier
Network adjustment is matched with rear class, then again by microstrip lines to forward power, and is input to the forward direction of power detecting unit
The power detector of power.
Relative to prior art, the present invention has the advantage that：
(1) present invention realizes that power amplifier automatically shuts down unlatching：Power detecting unit is understood detect to preceding backward power in real time,
Corresponding analog voltage is exported, relatively show whether the real-time standing wave level of antenna surpasses according to default thresholding by comparator
Mark.Power amplifier can be automatically shut down after alarm, detection is also may proceed to after releasing manually until vswr protection normally can just automatically open up work(
Put.
(2) there is high isolation degree：Using the unidirectional transmission property of circulator, power amplifier is protected to believe from high-power reflection
Number damage；
(2) Programmable logical controller is used, programming mode is more flexible, speed.
Brief description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the theory diagram that the reader of automatic switch power described in the embodiment of the present invention realizes device；
Fig. 2 is the structural representation of circulator described in the embodiment of the present invention；
Fig. 3 is the principle schematic of power amplifier control signal part described in the embodiment of the present invention；
The logi function chart that Fig. 4 realizes for EPLD described in the embodiment of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of reader of automatic switch power realizes device, as shown in figure 1, including
Forward signal generating unit, required tone signal during for providing detection standing wave, including be sequentially connected PLL,
Modulator and amplifier etc.；
The day of forward and reverse power collecting unit, including coupler and circulator, described coupler one end and reader
Line options and matching unit connection, other end connection circulator；Combined by the coupler and circulator of orientation by forward signal
Extracted respectively with reverse signal；
Power detecting unit, including two power detectors and a comparator, two power detectors be respectively used to by
Forward power and backward power calculated according to certain non-linear relation be input to after corresponding magnitude of voltage two of comparator it is defeated
Enter end, comparator output comparative result；
Automatic switch power cell, receives the output valve of comparator, and logic fortune is carried out by PLD EPLD
Calculate, then coordinate the real-time detection of CPU controls, realize to power amplifier before automatic switch, while carrying out real-time standing wave announcement by Alarm Unit
It is alert.
Number of the EPLD of the automatic switch power cell logical process storage to interrupt register and alarm register
According to the alarm register control alarm lamp is opened；The interrupt register is used to store the standing wave announcement that comparator output is enabled
Alert signal, standing wave alarm signal low level is effective；The alarm register is used for the control signal for storing control alarm lamp；It is described
Interrupt register updates the data of alarm register by phase inverter with feedback after the progress of alarm register or computing.
The EPLD can lead to before being closed according to the data of alarm register to power amplifier, the rear data for updating interrupt register
Cross host computer and send instruction, i.e., EPLD is forced the register step-down that will alarm by CPU, so as to extinguish alarm lamp；
As shown in figure 3, the power amplifier that the standing wave testing result of the output of the automatic switch power cell is sent with host computer
Power control signal is by with controlling the preceding switch to power amplifier after door computing；Even if so as to realize that the power amplifier that host computer is sent is enabled
Signal, is opened before control to the switch of power amplifier, if now abnormal still for standing wave according to the output result of comparator, is still controlled
The preceding switch to power amplifier is alarmed and closed to alarm lamp.
Operation principle and process：
The forward signal generating unit provides tone signal, is adjusted by the output matching network of reader power amplifier with after
The matching of level, then again by microstrip lines to forward power, and is input to the power of the forward power of power detecting unit
Detector.
Meanwhile, forward power continues on through 1 port for being input to circulator, is exported from port 2, as shown in Fig. 2 circulator
Port 2 exports forward power to coupler transfer to day line options and matching unit, switches different antennae as needed.So far,
Reader realizes transmitting forward power and gathers forward power information.
If now antenna is not in place, forward power signal will again pass by coupler, coupling by antenna opening backtracking
Close part to enter in the reverse link of reader, straight-through part goes successively to 2 ports of circulator, according to the clockwise of circulator
Characteristic (is used) in this application, and signal enters the power detector of the backward power of power detecting unit by 3 mouthfuls of outputs.
The power detecting unit receives the forward and reverse power signal gathered in real time, by before conversion in real time output to
And the corresponding detectable voltage signals of backward power signal, voltage signal immediately enter comparator carry out voltage ratio compared with.Such as Fig. 3 institutes
Show, when antenna opening standing wave is normal, forward power detection voltage is more than inverse detection voltage, and comparator output high level works as antenna
Mouth is not in place, and the power that forward link is sent will all reflex to reverse link, causes backward power to be more than forward power, therefore
Comparator can export low level, i.e. standing wave alarm is effective.
According to the output result of comparator, standing wave alarm signal end is enabled, as shown in figure 4, when standing wave alarm signal end makes
After energy, EPLD can carry out following logical process：
First, standing wave alarm signal step-down (i.e. ' 0 ') is stored in interrupt register I_irq_n afterwards, then after phase inverter
Carried out or computing with alarm register S_VSWR_reg, after be input to alarm register S_VSWR_reg again；Here from logic
Angle is said, is that output signal is assigned to input again.Say, fed back in fact from the angle of hardware.Therefore accused in standing wave
Alert and two kinds of situations of no alarm, alarm register S_VSWR_reg is still high level, and alarm register S_VSWR_reg is controlled
The alarm lamp of system connection keeps often bright state.
When the register S_VSWR_reg that alarms is 1, starts standing wave alarm, enable step-down to power amplifier before EPLD controls, i.e.,
To power amplifier before closing, the purpose of protection circuit is reached.When it is preceding closed to power amplifier after, comparator is output as high level, alarm signal
Eliminate, interrupt register I_irq_n becomes high level.If wanting, the state eliminated in alarm extinguishes alarm lamp, need to start vswr protection
Operation (host computer operation) is eliminated, EPLD is forced the register S_VSWR_reg step-downs that will alarm, now by the S_ of OR gate
VSWR_reg is still low, alarm lamp extinguishing.
When the register S_VSWR_reg that alarms is 0, forward direction power amplifier enables the data transmitted by host computer and controlled, if
' 0 ', that is, turn off power amplifier.If ' 1 ', power amplifier is opened.Comparator continues to judge whether current antenna is in place, if in place, institute just now
The vswr protection of progress eliminates effective, being capable of permanent closing alarm lamp, thoroughly releasing warning.If now antenna does not exist still
Position, then may proceed to prompting standing wave alarm, that is, host computer operation standing wave is eliminated after operation, and the lamp went out for alarm once and then again
It can light, turn off power amplifier.It is in place to antenna until examining, alarm just can be thoroughly eliminated, power amplifier is no longer turned off.So it is achieved that
The function of automatic switch power.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (6)
1. a kind of reader of automatic switch power realizes device, it is characterised in that including：
Forward signal generating unit, for providing tone signal required during detection standing wave；
Forward and reverse power collecting unit, for forward signal and reverse signal are carried out extracting respectively obtain forward power and
Backward power；
Power detecting unit, including two power detectors and a comparator, two power detectors are respectively used to receive
Forward power and backward power calculated according to certain non-linear relation and two of comparator be input to after corresponding magnitude of voltage
Input, comparator output comparative result；
Automatic switch power cell, receives the output valve of comparator, and logical process is carried out by PLD, realizes certainly
Dynamic switch forward power amplifier, while carrying out real-time standing wave alarm by Alarm Unit.
2. the reader of automatic switch power according to claim 1 realizes device, it is characterised in that：When power detection list
Member is detected after standing wave exception, enables the PLD of standing wave alarm signal, afterwards the automatic switch power cell
Realize following logic control function：
Standing wave alarm signal is stored in interrupt register, wherein, the interrupt register passes through phase inverter and alarm register
Feedback updates the data of alarm register after progress or computing, and the alarm register control alarm lamp unlatching, the alarm is posted
Storage is used for the control signal for storing control alarm lamp；
The PLD closed according to the data of alarm register before to power amplifier, the number of rear renewal interrupt register
According to.
3. the reader of automatic switch power according to claim 2 realizes device, it is characterised in that：Host computer can be passed through
Order is sent, makes PLD forcibly changing alarm register data, extinguishes alarm lamp.
4. the reader of automatic switch power according to claim 3 realizes device, it is characterised in that：The automatic switch
The amplifier power supply control signal that the standing wave testing result of the output of power cell is sent with host computer by with controlled after computing before
To the switch of power amplifier.
5. the reader of automatic switch power according to claim 1 realizes device, it is characterised in that：The forward direction and anti-
Include day line options and the matching unit company of coupler and circulator, described coupler one end and reader to power collecting unit
Connect, other end connection circulator；Forward signal and reverse signal are carried out respectively by coupler and the circulator combination of orientation
Extraction obtains forward power and backward power.
6. the reader of automatic switch power according to claim 1 realizes device, it is characterised in that：The forward signal
Then the tone signal of generating unit output passes through again by the output matching network adjustment of reader power amplifier and matching for rear class
Microstrip lines are input to the power detector of the forward power of power detecting unit to forward power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203847.3A CN107092846A (en) | 2017-03-30 | 2017-03-30 | A kind of reader of automatic switch power realizes device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710203847.3A CN107092846A (en) | 2017-03-30 | 2017-03-30 | A kind of reader of automatic switch power realizes device |
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| Publication Number | Publication Date |
|---|---|
| CN107092846A true CN107092846A (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710203847.3A Pending CN107092846A (en) | 2017-03-30 | 2017-03-30 | A kind of reader of automatic switch power realizes device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112468241A (en) * | 2020-11-11 | 2021-03-09 | 深圳国人无线通信有限公司 | Antenna management device for 5G small base station |
-
2017
- 2017-03-30 CN CN201710203847.3A patent/CN107092846A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112468241A (en) * | 2020-11-11 | 2021-03-09 | 深圳国人无线通信有限公司 | Antenna management device for 5G small base station |
| CN112468241B (en) * | 2020-11-11 | 2022-05-13 | 深圳国人无线通信有限公司 | Antenna management device for 5G small base station |
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Application publication date: 20170825 |