CN109150633A - A kind of method and device of power amplifier protection - Google Patents
A kind of method and device of power amplifier protection Download PDFInfo
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- CN109150633A CN109150633A CN201811221052.6A CN201811221052A CN109150633A CN 109150633 A CN109150633 A CN 109150633A CN 201811221052 A CN201811221052 A CN 201811221052A CN 109150633 A CN109150633 A CN 109150633A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of method and devices of power amplifier protection, and power amplifier cannot be effectively protected in the prior art to solve the problems, such as.This method comprises: judging whether to occur following at least one abnormal: connecting exception with upper layer device, equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality；If so, shutdown power amplifier switch.Due in embodiments of the present invention, when equipment occurs following at least one abnormal: connect abnormal, equipment operating environment exception with upper layer device; device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality; power amplifier switch is turned off, so as to more protect power amplifier comprehensively.
Description
Technical field
The present invention relates to the method and devices that mobile communication technology field more particularly to a kind of power amplifier are protected.
Background technique
In existing mobile communcations system, base station system is drawn by Base Band Unit (Base Band Unit, BBU) and radio frequency
Remote unit (Radio Remote Unit, RRU) composition.RRU emits baseband signal of the link primary recipient from BBU, and to base
Band signal carries out the processing such as number and processing, digital-to-analogue conversion, signal filtering, finally by aerial radiation to free space.And it penetrates
Terminal units of the frequency power amplifier as entire base station system, the stability and reliability of work directly affect base station system
Whether can operate normally, and guarantee the normal communication of user in coverage area, therefore, corresponding safeguard measure be taken to power amplifier
It is to be of great significance.
Currently, in the prior art, power amplification protecting method includes: in digital display circuit generally by judging that digital signal is
It is no abnormal and take cut-off signals or reduce signal power, to achieve the effect that protect power amplifier；And it is general in simulation system
The input power of power amplifier is limited using hardware mode to realize protection power amplifier.Above two protected mode is all simply by input
Signal is effectively controlled, and makes the signal for being input to power amplifier in the tolerance range of power amplifier.
But there are when otherwise exception in system, both the above mode cannot be effectively protected power amplifier.Such as: number
Clock synchronous abnormality in type families system, so as to cause signal processing chip exception, at this moment Digital Signal Processing status devices just have
It is likely to occur exception, and then is unable to complete power amplifier protection；And also there is certain receiving energy by hardware limitation input power mode
Power, once exceeding limit of power, hardware protection mode will fail.
Summary of the invention
The embodiment of the invention provides a kind of power amplification protecting method and device, to solve in the prior art cannot be effective
The problem of protecting power amplifier.
The embodiment of the invention provides a kind of power amplification protecting methods, which comprises
Judge whether to occur following at least one abnormal: connecting abnormal, equipment operating environment exception, equipment with upper layer device
Arrangement abnormalities, losing lock is abnormal, clock synchronous abnormality；
If so, shutdown power amplifier switch.
Further, the equipment operating environment includes: extremely
Power amplifier crosses temperature abnormality, power amplifier voltage exception, overpower exception, power amplifier current anomaly.
The device configuration includes: extremely
Fpga chip arrangement abnormalities, clock chip arrangement abnormalities, DAC chip arrangement abnormalities.
The losing lock includes: extremely
Clock losing lock, local oscillator losing lock, phaselocked loop losing lock.
Further, if not occurring exception, the method also includes:
Power amplifier switch is kept to open.
Further, after the shutdown power amplifier switch, the method also includes:
Judge whether to occur following at least one abnormal: connecting abnormal, equipment operating environment exception, equipment with upper layer device
Arrangement abnormalities, losing lock is abnormal, clock synchronous abnormality；
If not, opening power amplifier switch.
The embodiment of the invention provides a kind of power amplifier protection device, which includes:
Status processing module receives the first control information for judging whether, if so, shutdown power amplifier switch；
Host Status module, it is abnormal for judging whether to occur connecting with upper layer device, if so, to status processing module
Send the first control information；
Slave status module, following at least one abnormal for judging whether to occur, equipment operating environment is abnormal, and equipment is matched
Exception is set, losing lock is abnormal, clock synchronous abnormality, if so, sending the first control information to status processing module.
Further, the slave status module includes:
Digital Signal Processing state cell, for judging whether occur clock synchronous abnormality in digital signal processing circuit
And/or phaselocked loop losing lock is abnormal, if so, sending the first control information to status processing module, wherein at the digital signal
Manage includes phaselocked loop, internal digital clock, logical AND chip in circuit；
Clock status unit, for judging whether clock circuit clock losing lock exception occurs, if so, to state processing mould
Block sends the first control information, wherein the clock circuit includes built-in crystal oscillator, phaselocked loop, divider circuit；
Local oscillator state cell, for judging whether local oscillation circuit local oscillator losing lock exception occurs, if so, to state processing mould
Block sends the first control information, wherein the local oscillation circuit includes crystal oscillator, phaselocked loop, digital divider circuit, number
Phase detector circuit；
DAC state cell, for judging whether DAC circuit phaselocked loop losing lock exception occurs, if so, to state processing mould
Block sends the first control information, wherein the DAC circuit includes operational amplifier, phaselocked loop, weighted resistance network, reference power supply；
Power amplifier unit, for judging it is following at least one abnormal whether power amplifier occurs, power amplifier crosses temperature abnormality, power amplifier electricity
Reduce off-flavor is normal, and overpower is abnormal, power amplifier current anomaly, if so, sending the first control information to status processing module.
Further, the slave status module further include:
It is separately connected the Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state list
The slave status unit of member and power amplifier unit, the slave status unit are connected to it described for judging whether to receive
Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit send the
One control information determines output information according to whether receiving the first control information；
The status processing module includes:
Power amplifier holding unit is connect with the slave status unit, and the output for receiving the slave status unit is believed
Breath, and the output information received is sent to logic control element；
Logic control element and the Host Status module, power amplifier holding unit, Digital Signal Processing state cell, clock
State cell, local oscillator state cell, DAC state cell are connected with power amplifier unit, for according to the Host Status module, power amplifier
Holding unit, Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit
Output, logic and operation is carried out, according to logic and operation as a result, determining to the control result of power amplifier.
Further, the slave status unit, specifically for determining the first output when receiving the first control information
Information；
The power amplifier holding unit is specifically used for receiving the first output information, and first output information is sent to
The logic control element；
The logic control element, specifically for according to the first output information and Host Status module received, number
The output of signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit, determination are patrolled
Collecting with the result of operation is the first control information, turns off power amplifier switch.
Further, the slave status unit, specifically for determining second when being not received by the first control information
Output information；
The power amplifier holding unit is specifically used for receiving the second output information, and second output information is sent to
The logic control element；
The logic control element, specifically for the second output information that basis receives, and in Host Status module, number
The output of word signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit is the
When two output informations, determines that the result of logic and operation is the second control information, open power amplifier switch.
The embodiment of the present invention provides a kind of power amplification protecting method and device, this method judge whether following at least one occur
It is abnormal: abnormal, equipment operating environment exception, device configuration exception, losing lock exception, clock synchronous abnormality are connect with upper layer device；
If so, shutdown power amplifier switch.Due in embodiments of the present invention, when equipment occurs following at least one abnormal: with upper layer
Equipment connection is abnormal, and equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, and clock synchronous abnormality turns off power amplifier
Switch, so as to more protect power amplifier comprehensively.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of power amplifier protection device structural schematic diagram that the embodiment of the present invention 1 provides；
Fig. 2A is the power amplification protecting method schematic illustration that the embodiment of the present invention 4 provides；
Fig. 2 B is the principle of the power amplifier unit progress power amplifier protection in the slave status module that the embodiment of the present invention 4 provides
Figure；
Fig. 2 C is the processing logic diagram for the Digital Signal Processing state cell that the embodiment of the present invention 4 provides；
Fig. 3 is a kind of flow diagram for power amplification protecting method that the embodiment of the present invention 5 provides.
Specific embodiment
The present invention will be describe below in further detail with reference to the accompanying drawings, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment 1:
Fig. 1 is a kind of power amplifier protection device provided in an embodiment of the present invention, which includes:
Status processing module 1001 receives the first control information for judging whether, if so, shutdown power amplifier switch；
Host Status module 1002, it is abnormal for judging whether to occur connecting with upper layer device, if so, to state processing
Module sends the first control information；
Slave status module 1003, following at least one abnormal for judging whether to occur, equipment operating environment is abnormal, if
Standby arrangement abnormalities, losing lock is abnormal, clock synchronous abnormality, if so, sending the first control information to status processing module.
Existing power amplification protecting method is all to make the signal for being input to power amplifier by effectively being controlled input signal
Within the tolerance range of power amplifier, the protection to power amplifier is realized by this method.But when there are otherwise different in system
Clock synchronous abnormality in Chang Shi, such as system will also will affect power amplifier, therefore when clock synchronous abnormality, it is also desirable to carry out
Power amplifier protection.
Host Status module is a function of host module, and host module is generally responsible for and other equipment and slave module
Message communicating, play the role of forming a connecting link.When Host Status module detects abnormal, exception is such as connect with upper layer, and
This exception needs to close power amplifier when being protected, and alarm status is supplied to status processing module by Host Status module
To send the first control information of mark host module failure to status processing module.
Slave status module is a function of slave module, it is provided by slave module.Slave module is mainly responsible for respectively
The starting and configuration of chip device.Such as: fpga chip, clock chip, DAC chip etc..When slave status module detects exception
When, such as chip arrangement abnormalities, and this exception needs to close power amplifier when being protected, and slave status module provides alarm status
To status processing module, it can send the first control information of mark slave module failure to status processing module.
Host Status module and slave status module are existing module in power amplifying device, in embodiments of the present invention to upper
Module is stated without repeating.
In embodiments of the present invention, judge whether occur connecting exception with upper layer device by Host Status module, if
It is to send the first control information to status processing module.Judge whether following at least one occur by slave status module different
Often, equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality, if so, to status processing module
Send the first control information.Also, the sent by status processing module receiving host block of state and slave status module
One control information turns off power amplifier switch if status processing module receives the first control information.Function is turned off by this way
The switch put reduces or prevents the damaged condition of the power amplifier in equipment, operates normally equipment efficiently for a long time.Status processing module
Protection according to the first control information realization to power amplifier, this method are more efficient to the protective capability of power amplifier and comprehensive.
Embodiment 2:
It is effective to realize power amplifier protection in order to which unit exception is determined more accurately, on the basis of the above embodiments,
In the embodiment of the present invention, the slave status module 1003 includes:
Digital Signal Processing state cell 1004, for judging whether occur clock synchronous different in digital signal processing circuit
Often and/or phaselocked loop losing lock is abnormal, if so, sending the first control information to status processing module, wherein the digital signal
It include phaselocked loop, internal digital clock, logical AND chip in processing circuit；
Clock status unit 1005, for judging it is abnormal whether clock circuit clock losing lock occurs, if so, at state
It manages module and sends the first control information, wherein the clock circuit includes built-in crystal oscillator, phaselocked loop, divider circuit；
Local oscillator state cell 1006, for judging it is abnormal whether local oscillation circuit local oscillator losing lock occurs, if so, at state
It manages module and sends the first control information, wherein the local oscillation circuit includes crystal oscillator, phaselocked loop, digital divider circuit,
Digital phase discriminator circuit；
DAC state cell 1007, for judging it is abnormal whether DAC circuit phaselocked loop losing lock occurs, if so, at state
It manages module and sends the first control information, wherein the DAC circuit includes operational amplifier, phaselocked loop, weighted resistance network, benchmark
Power supply；
Power amplifier unit 1008, for judging it is following at least one abnormal whether power amplifier occurs, power amplifier crosses temperature abnormality, function
Electric voltage exception is put, overpower is abnormal, power amplifier current anomaly, if so, sending the first control information to status processing module.
Digital Signal Processing state cell is provided by digital signal processing module.When it detects abnormal, and this
It is abnormal when carrying out closing power amplifier and being protected, alarm status is supplied to status processing module.Such as Digital Signal Processing mould
Block detects that input signal is excessive, signal is still not up to minimum requirements, the clock synchronous abnormality, lock that input work is put after treatment
Phase ring losing lock etc., these, which require to be supplied to Digital Signal Processing block of state, summarizes, and then is supplied to status processing module.
Clock status unit mainly obtains the clock module operating status in equipment；Local oscillator state cell mainly obtains equipment
Interior local oscillator working condition；DAC state cell mainly provides the working condition of the DAC module by DAC module.
Specifically, including: Digital Signal Processing state cell, clock status unit, local oscillator state in slave status module
Unit, DAC state cell and power amplifier unit.Wherein, Digital Signal Processing state cell is for judging Digital Signal Processing electricity
Whether occur clock synchronous abnormality in road and/or phaselocked loop losing lock is abnormal, if it is, sending the first control to status processing module
Information processed.Due to generally including phaselocked loop in digital signal processing circuit, internal digital clock, logical AND chip, and internal number
Word clock and phaselocked loop are easy to happen exception, so the exception that digital signal processing circuit would generally generate is clock synchronous abnormality
It is abnormal with phaselocked loop losing lock.
Clock status unit is for judging whether clock circuit clock losing lock exception occurs, if it is, to state processing
Module sends the first control information.Due to generally including built-in crystal oscillator in clock circuit, phaselocked loop, divider circuit, and locking phase
Ring is easy to happen exception, so the exception that clock circuit would generally occur is that clock losing lock is abnormal.
Local oscillator state cell is for judging whether local oscillation circuit local oscillator losing lock exception occurs, if it is, to state processing
Module sends the first control information.Since the phaselocked loop in local oscillation circuit is easy to happen exception, so local oscillation circuit can occur
Exception is that local oscillator losing lock is abnormal.
DAC state cell is abnormal for judging whether to occur in DAC circuit phaselocked loop losing lock, if it is, at state
It manages module and sends the first control information.Since the phaselocked loop in DAC circuit is easy to happen exception, so local oscillation circuit can occur
Exception is that local oscillator losing lock is abnormal.
Embodiment 3:
In order to realize the significantly more efficient protection to power amplifier, on the basis of the various embodiments described above, in the embodiment of the present invention
In, the slave status module 1003 further include: slave status unit 1009；
Slave status unit 1009 is separately connected the Digital Signal Processing state cell, clock status unit, local oscillator shape
State unit, DAC state cell and power amplifier unit, the slave status unit 1009, are connected thereto for judging whether to receive
The Digital Signal Processing state cell 1004, clock status unit 1005, local oscillator state cell 1006, DAC state cell
1007 and the first control information that sends of power amplifier unit 1008 according to whether receiving the first control information determine output information；
The status processing module 1001 includes: power amplifier holding unit 1010 and logic control element 1011；
Power amplifier holding unit 1010 is connect with the slave status unit 1009, for receiving the slave status unit
1009 output information；
Logic control element 1011 is separately connected the Host Status module, power amplifier holding unit, Digital Signal Processing shape
State unit, clock status unit, local oscillator state cell, DAC state cell, power amplifier unit and slave status unit are used for basis
The Host Status module, power amplifier holding unit, Digital Signal Processing state cell, clock status unit, local oscillator state cell,
The output of DAC state cell, power amplifier unit and slave status unit, carry out logic and operation, according to logic and operation as a result,
Determine the control result to power amplifier.
Due in slave status module Digital Signal Processing state cell, clock status unit, local oscillator state cell,
DAC state cell and power amplifier unit can often detect clock losing lock may occur in exception, such as clock status unit different
Often, need shutdown power amplifier switch that can still generate after a period of time if after the abnormal restoring is normal, power amplifier switch need to be opened at this time
The exception then need to turn off power amplifier switch again, and close power amplifier repeatedly will cause the damage of power amplifier.Therefore the frequency of power amplifier in order to prevent
Numerous switch, so that causing the damage of power amplifier.In embodiments of the present invention, it is provided with power amplifier in status processing module and keeps single
Member.Guard mode is latched by the power amplifier holding unit, only when slave status module detects abnormal restoring, and
When occurring without other exceptions, power amplifier holding unit is just set to out power amplifier state.The power amplifier holding unit and slave status list
Member connection, for receiving the output information of slave status unit transmission.Slave status unit is separately connected Digital Signal Processing shape
State unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit, for receiving Digital Signal Processing shape
The first control information that state unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit are sent, according to
The the first control information received, determines output information.
In embodiments of the present invention, the protection philosophy for devising a kind of " quick closing valve is opened slowly ", specifically, quick closing valve logic are as follows: when
The Host Status module of status processing module connection closes function when any one of slave status module occurs abnormal immediately
It puts；Slowly logic is opened are as follows: if the output of power amplifier holding unit is the first control information, the output of logic control element must at this time
For the first control information, power amplifier still cannot be opened at this time, only when power amplifier holding unit, Host Status module, digital signal
The output of processing status unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit is simultaneously second
When controlling information, power amplifier can be just opened.Therefore, in embodiments of the present invention, the switch of power amplifier be by Host Status module, from
The operating status of machine block of state and power amplifier holding unit carries out synthesis control, and wherein the operating status of slave status module is
By the operation of Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit
State carries out synthesis control.Specifically, function should be closed at this time when any one above-mentioned module or unit detect abnormal
It puts, to realize the protection to power amplifier.
In embodiments of the present invention, in order to realize the power amplifier protection philosophy of above-mentioned " quick closing valve is opened slowly ", in state processing mould
It further include a logic control element in block, the logic control element is by Host Status module, power amplifier holding unit, digital signal
The output of processing status unit, clock status unit, local oscillator state cell, DAC state cell, power amplifier unit carries out logical AND fortune
It calculates, according to logic and operation as a result, determining to whether power amplifier carries out shutdown or opening operation.
Embodiment 4:
In order to accurately determine power amplifier switch, on the basis of the various embodiments described above, in embodiments of the present invention, it is described from
Machine state cell, specifically for determining the first output information when receiving the first control information；
The power amplifier holding unit is specifically used for receiving the first output information, and first output information is sent to
The logic control element；
The logic control element, specifically for according to the first output information and Host Status module received, number
The output of signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit, determination are patrolled
When volume being the first control information with the result of operation, shutdown power amplifier switch.
Power amplifier holding unit receives the first control information that slave status unit is sent, due to the number in slave status module
Word signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit can be detected often
It is abnormal out, and the major function of power amplifier holding unit is to prevent frequently switching on for power amplifier, so that causing the damage of power amplifier.And logic
The protection philosophy of " quick closing valve is opened slowly " that control unit designs for realizing the embodiment of the present invention.
Slave status unit and Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state
Unit is connected with power amplifier unit, when slave status unit receives the first control information that any unit connected to it is sent
When, determine the first output information.First output information is sent power amplifier holding unit by slave status unit, which keeps
Unit is used to receive the first output information of slave status unit transmission.
In embodiments of the present invention, logic control element determines the shutdown or unlatching of power amplifier, and logic control element is by leading
Machine block of state, slave status module, the output information of power amplifier holding unit carry out synthesis control, wherein power amplifier holding unit
It is to be controlled by the output information of slave status unit, slave status unit is by Digital Signal Processing state cell, clock
State cell, local oscillator state cell, DAC state cell and power amplifier unit output information carry out synthesis control, power amplifier keeps single
Member determines the output information of power amplifier holding unit according to the output of the slave status unit of connection.
Therefore, in embodiments of the present invention, logic control element is used for according to Host Status module, slave status module,
The output information of power amplifier holding unit determines the result of logic and operation.If Host Status module, Digital Signal Processing state
Any one module or unit detection of unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit
To exception, then the result of logic and operation is the first control information, and turns off power amplifier switch.Wherein, if power amplifier holding unit
Output information is the first control information, and the output information of slave status unit and Host Status module is the second control information
When, the result of logic and operation is also the first control information at this time.
In specific implementation, if Host Status module detects exception, the output of Host Status module is 1, if not
Detect exception, then the output of Host Status module is 0；If Digital Signal Processing state cell in slave status module, when
Any one unit in clock state cell, local oscillator state cell, DAC state cell and power amplifier unit detects exception, then from
The output of machine state cell is 1, on the contrary, if above-mentioned Digital Signal Processing state cell, clock status unit, local oscillator state list
Member, DAC state cell and power amplifier unit all do not detect exception, then the output of slave status unit is 0.If logic control
Unit receives the information of any one module or unit output when being 1, then illustrates that at least one above-mentioned unit or module occur
Exception, then the result of logic and operation is 1, then shows that power amplifier switch need to be turned off, realize the protection of power amplifier.
In embodiments of the present invention, the slave status unit, specifically for when being not received by the first control information,
Determine the second output information；
The power amplifier holding unit is specifically used for receiving the second output information, and second output information is sent to
The logic control element；
The logic control element, specifically for the second output information that basis receives, and in Host Status module, number
The output of word signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit is the
When two output informations, determines that the result of logic and operation is the second control information, open power amplifier switch.
Specifically, determining the second output information, and should when slave status unit is not received by the first control information
Second output information is sent to power amplifier holding unit；The second output information received is sent logic control by power amplifier holding unit
Unit processed.When the information that logic control element receives is the second output information, just determine that the result of logic and operation is
Second control information, to open power amplifier switch.
In specific implementation, if exception, Host Status module output the second control letter is not detected in Host Status module
Breath 0；If Digital Signal Processing state cell, clock status unit in slave status module, local oscillator state cell, DAC state
Exception is not detected in all units in unit and power amplifier unit, then the second control of slave status unit output information 0.If
Logic control element receive all modules and unit export second control information 0 when, then illustrate above-mentioned all units and
Exception is not detected in module, then the result of logic and operation is the second control information 0, then mark should open power amplifier switch and make
Equipment operates normally.
Fig. 2A is the structure principle chart of overall power amplifier protection, including Host Status module, power amplifier unit, Digital Signal Processing
State cell, clock status unit, local oscillator state cell and DAC (Digital to analog converter) state list
Member.
The major function of status processing module is receiving host block of state, slave status module and power amplifier holding unit
Output information, and the output information received is subjected to logic and operation operation, then realized according to the result of logic and operation
Power amplifier is protected.The mode of protection includes: 1) to turn off to the drain power of power amplifier；2) to the grid voltage of power amplifier into
Row shutdown.
Specifically, status processing module by Host Status module, Digital Signal Processing state cell, clock status unit,
Whether local oscillator state cell, DAC state cell are abnormal and the output information of power amplifier holding unit carries out synthesis control.Tool
During body is implemented, when Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell, power amplifier list
There is exception in any one of member unit, then slave status unit exports the first output information 1, then power amplifier holding unit should
First output information is sent to logic control element, then no matter Host Status module and slave status module, which export any control, is believed
Breath, logic control element output the first control information 1, then mark should turn off power amplifier switch, realize the protection to power amplifier.If number
Word signal processing state cell, clock status unit, local oscillator state cell, DAC state cell, power amplifier unit are not detected different
Often, then the output of slave status unit is the second control information 0, and the output of power amplifier holding unit is 0, at this time logic control element
Output can be according to Host Status module, Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC shape
The output of state unit, it is determined whether open power amplifier switch.
According to the self-characteristic of the power amplifier amplifier tube in power amplifier, it is ensured that power amplifier normal work steady in a long-term should make function
Work is put under normal power supply state and input/output condition.Therefore, system power amplifier design protection principle include: 1) power amplifier answer
Just entering amplification mode in normal condition, normal condition is primarily referred to as leakage pressure and stablizes, and grid voltage configuration is correct, digital display circuit fortune
Row is normal；2) input, output condition should be in the reasonable working range of power amplifier；3) for various exceptional conditions, should be able to have in time
The protection power tube of effect.
According to above-mentioned design principle, power amplifier design protection carries out in terms of following three:
1, power amplifier flow elements are opened
It opens power amplifier process and refers to and enable in setting power amplifier as sequence of operations before opening and later, to ensure to add in power amplifier
Entering pumping signal makes to make digital display circuit and power amplifier be in normal working condition, mainly each core of digital display circuit before power amplifier work
Piece configuration is completed and normal operation, and the leakage pressure of power amplifier is stablized and grid voltage configuration is correct.The exception of this part is by slave status module
It collects, is converged in status processing module after having collected.
The schematic diagram of power amplifier protection is carried out for the power amplifier unit in slave status module as shown in Figure 2 B, power amplifier unit is main
The exception of detection includes power amplifier excess temperature, power amplifier voltage, chip configuration, overpower, power amplifier electric current, wherein power amplifier voltage includes function
Put grid voltage and power amplifier leakage pressure.By above-mentioned various abnormal progress logic and operations, and give operation result to status processing module.
2, signal control portion
Control for input signal is mainly two aspects:
1) programmable logic automatic gain control circuit (Programable Logic Automatic Gain
Control, PLAGC) or adaptive logic circuit (Adaptive Logic Circuit, ALC)
For integrated power amplifier, peak power output is programmable gate array (Field- at the scene
Programmable Gate Array, FPGA) it is interior using the realization of PLAGC function.For independent power amplifier, peak power output is
It is realized in power amplifier module using alc circuit.The control to amplified signal mean power may be implemented in both modes, specifically
Value is determined according to project demand.
2) peak power is protected
The peak power of power amplifier input signal is protected, and is to be realized inside FPGA using peak value protective module.When peak value is protected
The input signal of shield module is prescribed a time limit lower than protective door, normal to export；It prescribes a time limit when up to or over protective door, it is defeated to close I/Q signal
Out.But if there is exception then by digital signal processing module triggering power amplifier protection, Fig. 2 C is number provided in an embodiment of the present invention
The processing logic diagram of word signal processing state cell.Wherein, the abnormal signal that signal processing generates is the prior art,
It is not repeated in the embodiment of the present invention.
3, abnormality handles part
The i.e. alarm protection of abnormality processing.It provides triggering by each functional module.It is primarily directed to various possible productions
The exception of raw spurious signal is closed by alarm triggered power amplifier.It is directed to the relevant abnormalities of digital signal processing module while meeting
Close the operation of I/Q data.
Digital Signal Processing state cell includes signal processing and power amplifier protection part in Fig. 2 C, wherein at signal
The input signal that reason part generates is the prior art extremely, is not repeated in embodiments of the present invention.Specifically, at digital signal
The inspection of clock synchronous abnormality may be implemented in reason state cell, and specifically if there is no optical module, optical module is believed in place at this time
Number abnormality can be sent to logical AND chip, then can determine clock synchronous abnormality；If Digital Signal Processing state cell
In have optical module, but when light-receiving is abnormal, light-receiving abnormal signal can send abnormality to logical AND chip, then at this time
It can determine clock synchronous abnormality；If occurring in Digital Signal Processing state cell, phaselocked loop losing lock is abnormal, and PLL sends locking
Indicate logical AND chip.
The result of logical AND chip is the output of the Digital Signal Processing state cell in Digital Signal Processing state cell,
The output is to control information, sends status processing module for the control information；Patrolling in Digital Signal Processing state cell
It collects and determines that I/Q data opens and closes control jointly with the result and peak power of chip statistics and the result of judgement, if I/Q data
It is in close state, does not then transmit a signal to D/A module, which can also realize protection namely input signal exception to power amplifier
It is also required to protect power amplifier.
In the specific implementation process, method provided in an embodiment of the present invention can be by software realization or to pass through hardware real
It is existing, or be implemented in combination with by the two.Such as: status processing module can have CPLD or FPGA to realize, can also by with door core
The hardware circuits such as piece are realized.
Embodiment 5:
Fig. 3 is a kind of flow diagram of power amplification protecting method provided in an embodiment of the present invention, which includes following step
It is rapid:
S301: judge whether to occur following at least one abnormal: connecting exception with upper layer device, equipment operating environment is different
Often, device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality.
Existing power amplification protecting method is all to make the signal for being input to power amplifier by effectively being controlled input signal
Within the tolerance range of power amplifier, the protection to power amplifier is realized by this method.But when there are otherwise different in system
Clock synchronous abnormality in Chang Shi, such as system, will also will affect power amplifier, thus when present clock synchronous abnormality when, it is also desirable to
Carry out power amplifier protection.
Therefore in embodiments of the present invention, whether Host Status module, which detects, connect abnormal, slave shape with upper layer device
Whether morphotype block detects following at least one abnormal: equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, clock
Synchronous abnormality, wherein slave status module include Digital Signal Processing state cell, clock status unit, local oscillator state cell,
DAC state cell and power amplifier unit.When the above at least one exception occurs in equipment, power amplifier switch should be turned off, with to power amplifier into
Row protection.The damaged condition for reducing or preventing the power amplifier in equipment operates normally equipment efficiently for a long time.Wherein, it is set with upper layer
Exception is connect with parent base station for the abnormal such as host module of connection, equipment operating environment exception such as power amplifier crosses temperature abnormality, and equipment is matched
It sets abnormal such as fpga chip arrangement abnormalities, the abnormal such as phaselocked loop losing lock exception of losing lock, clock synchronous abnormality such as Digital Signal Processing
Clock synchronous abnormality in state cell.Equipment realizes the protection to power amplifier, protection of this method to power amplifier according to exception information
Ability is more efficient and comprehensive.
S302: if so, shutdown power amplifier switch.
When equipment occurs following at least one abnormal: connecting exception with upper layer device, equipment operating environment is abnormal, equipment
Arrangement abnormalities, losing lock is abnormal, and clock synchronous abnormality may will affect the normal use of power amplifier, in order to realize to the comprehensive of power amplifier
Protection turns off power amplifier switch when equipment occurs at least one abnormal.
In embodiments of the present invention, judge whether occur connecting exception with upper layer device by Host Status module, if
It is to send the first control information to status processing module.Judge whether following at least one occur by slave status module different
Often, equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality, if so, to status processing module
Send the first control information.Also, the sent by status processing module receiving host block of state and slave status module
One control information turns off power amplifier switch if status processing module receives the first control information.Function is turned off by this way
The switch put reduces or prevents the damaged condition of the power amplifier in equipment, operates normally equipment efficiently for a long time.Status processing module
Protection according to the first control information realization to power amplifier, this method are more efficient to the protective capability of power amplifier and comprehensive.
Embodiment 6:
In order to which when more accurate equipment equipment operating environment exception occurs, on the basis of the above embodiments, at this
In inventive embodiments, the equipment operating environment includes: extremely
Power amplifier crosses temperature abnormality, power amplifier voltage exception, overpower exception, power amplifier current anomaly.
When occurring equipment operating environment exception in equipment, it is also desirable to the operation of shutdown power amplifier is carried out, to complete to power amplifier
Protection.Therefore in order to protect power amplifier, when the slave status module in equipment detects equipment operating environment exception, the is sent
For one control information to state processing equipment, state processing equipment turns off power amplifier switch according to the first control information received, real
Now to the protection of power amplifier.
Specifically, when the slave status module in equipment detects following at least abnormal: power amplifier crosses temperature abnormality, power amplifier electricity
Reduce off-flavor is normal, overpower is abnormal, power amplifier current anomaly, that is, is considered as equipment and equipment operating environment exception has occurred, at this point, slave status
Module sends the first control information to status processing module, and status processing module is opened according to the first control information shutdown power amplifier
It closes, to realize the protection to power amplifier.Wherein, power amplifier crosses temperature abnormality, power amplifier voltage exception, overpower exception, power amplifier current anomaly
Determination process be the prior art, do not repeat in embodiments of the present invention.
In order to be determined more accurately in equipment when occurrence of equipment arrangement abnormalities, and opened according to the abnormal shutdown power amplifier
It closes, realizes the protection of power amplifier, in embodiments of the present invention, the device configuration includes: extremely
Fpga chip arrangement abnormalities, clock chip arrangement abnormalities, DAC chip arrangement abnormalities.
Due to if continuing subsequent operation at this time, can also be damaged to power amplifier after exception occurs in device configuration.Cause
This is when occurring following at least one abnormal in equipment: fpga chip arrangement abnormalities, clock chip arrangement abnormalities, DAC chip are matched
Exception is set, that is, is considered as and device configuration exception has occurred, the first control information should be sent at this time to status processing module, state processing
Equipment turns off power amplifier switch according to the first control information, to realize the protection to power amplifier.
In specific implementation process, when the slave status module in equipment detects that generation is following at least one: FPGA core
There is device configuration exception in piece arrangement abnormalities, clock chip arrangement abnormalities, DAC chip arrangement abnormalities, i.e. slave status module,
Slave status module sends the first control information to status processing module at this time, and status processing module is according to the first control information
Turn off power amplifier switch.Wherein, the fpga chip arrangement abnormalities of equipment, clock chip arrangement abnormalities, DAC chip arrangement abnormalities are really
Determining process is the prior art, is not repeated in embodiments of the present invention.
Losing lock exception when occurs in order to be determined more accurately in equipment, and according to the abnormal shutdown power amplifier switch, it is real
The protection of existing power amplifier, in embodiments of the present invention, the losing lock includes: extremely
Clock losing lock, local oscillator losing lock, phaselocked loop losing lock.
Due to if continuing subsequent operation at this time, can also be damaged to power amplifier after occurring losing lock exception in equipment.
Therefore when occurring following at least one abnormal in equipment: clock losing lock, local oscillator losing lock, phaselocked loop losing lock are considered as appearance
Losing lock is abnormal, should send the first control information at this time to status processing module, state processing equipment is according to the first control information
Power amplifier switch is turned off, to realize the protection to power amplifier.
In specific implementation process, when the slave status module in equipment detects that generation is following at least one: clock is lost
There is losing lock exception in lock, local oscillator losing lock, phaselocked loop losing lock, i.e. slave status module, and slave status module sends first at this time
Information is controlled to status processing module, status processing module turns off power amplifier switch according to the first control information.Wherein, equipment
Clock losing lock, local oscillator losing lock, the determination process of phaselocked loop losing lock are the prior art, are not repeated in embodiments of the present invention.
Embodiment 7:
In order to which whether accurate judgement should continue that power amplifier switch is kept to open, on the basis of the various embodiments described above, at this
In inventive embodiments, if not occurring exception, the method also includes:
Power amplifier switch is kept to open.
When state processing equipment is not received by the first control information of any one module or unit transmission, that is, do not have
When detecting any exception, it should continue that power amplifier switch is kept to open.Process described in detailed process detailed in Example 4, at this
It is not further described in inventive embodiments.
Embodiment 8:
After equipment the above at least one exception occurs and turns off power amplifier switch, opened to determine when to open power amplifier
It closes, on the basis of the various embodiments described above, in embodiments of the present invention, after the shutdown power amplifier switch, the method is also wrapped
It includes:
Judge whether to occur following at least one abnormal: connecting abnormal, equipment operating environment exception, equipment with upper layer device
Arrangement abnormalities, losing lock is abnormal, clock synchronous abnormality；
If not, opening power amplifier switch.
In embodiments of the present invention, the protection philosophy of a kind of pair of power amplifier " quick closing valve is opened slowly " is devised, which is detailed in implementation
The description of example 3 is in embodiments of the present invention no longer described in detail the protection philosophy." quick closing valve the is opened slowly " process of specific implementation
The process that detailed in Example 4 describes.
It is abnormal due in embodiments of the present invention, judging whether to occur connecting with upper layer device by Host Status module,
If so, sending the first control information to status processing module.Judge whether occur following at least one by slave status module
Kind is abnormal, and equipment operating environment is abnormal, and device configuration is abnormal, and losing lock is abnormal, clock synchronous abnormality, if so, to state processing
Module sends the first control information.Also, it is sent by status processing module receiving host block of state and slave status module
The first control information if status processing module receives the first control information turn off power amplifier switch.It closes by this way
The switch of disconnected power amplifier, reduces or prevents the damaged condition of the power amplifier in equipment, operate normally equipment efficiently for a long time.State processing
Protection of the module according to the first control information realization to power amplifier, this method are more efficient to the protective capability of power amplifier and comprehensive.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of power amplification protecting method, which is characterized in that the described method includes:
Judge whether to occur following at least one abnormal: connecting abnormal, equipment operating environment exception, device configuration with upper layer device
Abnormal, losing lock is abnormal, clock synchronous abnormality；
If so, shutdown power amplifier switch.
2. the method as described in claim 1, which is characterized in that the equipment operating environment includes: extremely
Power amplifier crosses temperature abnormality, power amplifier voltage exception, overpower exception, power amplifier current anomaly；
The device configuration includes: extremely
Fpga chip arrangement abnormalities, clock chip arrangement abnormalities, DAC chip arrangement abnormalities；
The losing lock includes: extremely
Clock losing lock, local oscillator losing lock, phaselocked loop losing lock.
3. the method as described in claim 1, which is characterized in that if not occurring exception, the method also includes:
Power amplifier switch is kept to open.
4. the method as described in claim 1, which is characterized in that after the shutdown power amplifier switch, the method also includes:
Judge whether to occur following at least one abnormal: connecting abnormal, equipment operating environment exception, device configuration with upper layer device
Abnormal, losing lock is abnormal, clock synchronous abnormality；
If not, opening power amplifier switch.
5. a kind of power amplifier protection device, which is characterized in that described device includes:
Status processing module receives the first control information for judging whether, if so, shutdown power amplifier switch；
Host Status module, it is abnormal for judging whether to occur connecting with upper layer device, if so, being sent to status processing module
First control information；
Slave status module, following at least one abnormal for judging whether to occur, equipment operating environment is abnormal, and device configuration is different
Often, losing lock is abnormal, clock synchronous abnormality, if so, sending the first control information to status processing module.
6. device as claimed in claim 5, which is characterized in that the slave status module includes:
Digital Signal Processing state cell, for judge whether to occur in digital signal processing circuit clock synchronous abnormality and/or
Phaselocked loop losing lock is abnormal, if so, sending the first control information to status processing module, wherein the Digital Signal Processing electricity
It include phaselocked loop, internal digital clock, logical AND chip in road；
Clock status unit, for judging it is abnormal whether clock circuit clock losing lock occurs, if so, being sent out to status processing module
Send the first control information, wherein the clock circuit includes built-in crystal oscillator, phaselocked loop, divider circuit；
Local oscillator state cell, for judging it is abnormal whether local oscillation circuit local oscillator losing lock occurs, if so, being sent out to status processing module
Send the first control information, wherein the local oscillation circuit includes crystal oscillator, phaselocked loop, digital divider circuit, digital phase detection
Device circuit；
DAC state cell, for judging it is abnormal whether DAC circuit phaselocked loop losing lock occurs, if so, being sent out to status processing module
Send the first control information, wherein the DAC circuit includes operational amplifier, phaselocked loop, weighted resistance network, reference power supply；
Power amplifier unit, for judging it is following at least one abnormal whether power amplifier occurs, power amplifier crosses temperature abnormality, and power amplifier voltage is different
Often, overpower is abnormal, power amplifier current anomaly, if so, sending the first control information to status processing module.
7. device as claimed in claim 6, which is characterized in that the slave status module further include:
Be separately connected the Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell and
The slave status unit of power amplifier unit, the slave status unit receive the number connected to it for judging whether
The first control that signal processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit are sent
Information processed determines output information according to whether receiving the first control information；
The status processing module includes:
Power amplifier holding unit is connect with the slave status unit, for receiving the output information of the slave status unit, and
The output information received is sent to logic control element；
Logic control element and the Host Status module, power amplifier holding unit, Digital Signal Processing state cell, clock status
Unit, local oscillator state cell, DAC state cell are connected with power amplifier unit, for according to the Host Status module, power amplifier to be kept
Unit, Digital Signal Processing state cell, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit it is defeated
Out, logic and operation is carried out, according to logic and operation as a result, determining the control result to power amplifier.
8. device as claimed in claim 7, which is characterized in that the slave status unit receives first specifically for working as
When controlling information, the first output information is determined；
The power amplifier holding unit is specifically used for receiving the first output information, and first output information is sent to described
Logic control element；
The logic control element, specifically for according to the first output information and Host Status module received, digital signal
The output of processing status unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit, determines logical AND
The result of operation is the first control information, turns off power amplifier switch.
9. device as claimed in claim 7, which is characterized in that the slave status unit is not received by specifically for working as
When the first control information, the second output information is determined；
The power amplifier holding unit is specifically used for receiving the second output information, and second output information is sent to described
Logic control element；
The logic control element, specifically for the second output information that basis receives, and in Host Status module, number letter
The output of number processing status unit, clock status unit, local oscillator state cell, DAC state cell and power amplifier unit is second defeated
Out when information, determines that the result of logic and operation is the second control information, open power amplifier switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811221052.6A CN109150633A (en) | 2018-10-19 | 2018-10-19 | A kind of method and device of power amplifier protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811221052.6A CN109150633A (en) | 2018-10-19 | 2018-10-19 | A kind of method and device of power amplifier protection |
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| CN109150633A true CN109150633A (en) | 2019-01-04 |
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| CN201811221052.6A Pending CN109150633A (en) | 2018-10-19 | 2018-10-19 | A kind of method and device of power amplifier protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431592A (en) * | 2020-03-30 | 2020-07-17 | 京信通信系统（中国）有限公司 | Power amplifier protection method, power amplifier protection device and computer storage medium |
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| CN102271425A (en) * | 2011-06-22 | 2011-12-07 | 中兴通讯股份有限公司 | Method and device for protecting power amplifier |
| CN103187934A (en) * | 2011-12-30 | 2013-07-03 | 中兴通讯股份有限公司 | Protection method for radio frequency power amplifier and RRU (remote RF (radio frequency) unit) |
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Effective date of registration: 20200108 Address after: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Applicant after: Jingxin Communication System (China) Co., Ltd. Address before: 510663 Shenzhou Road, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangdong, 10 Applicant before: Jingxin Communication System (China) Co., Ltd. Applicant before: Jingxin Communication System (Guangzhou) Co., Ltd. Applicant before: Jingxin Communication Technology (Guangzhou) Co., Ltd. Applicant before: TIANJIN COMBA TELECOM SYSTEMS CO., LTD. |
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