CN109257023A - A kind of function discharge protection circuit and method - Google Patents
A kind of function discharge protection circuit and method Download PDFInfo
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- CN109257023A CN109257023A CN201810974722.5A CN201810974722A CN109257023A CN 109257023 A CN109257023 A CN 109257023A CN 201810974722 A CN201810974722 A CN 201810974722A CN 109257023 A CN109257023 A CN 109257023A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
Abstract
The invention discloses a kind of function discharge protection circuit and method, circuit includes: first order comparison circuit, and with the concatenated second level comparison circuit of first order comparison circuit；First order comparison circuit includes the first operational amplifier, current time for receiving input corresponding power detection voltage value and before current time predetermined time power detection voltage value, and the difference of the two is obtained after being compared, difference is exported into wherein inputting all the way as second level comparison circuit；Second level comparison circuit includes the second comparator, for receiving the difference of first order comparison circuit output and receiving preset difference value thresholding, and compares difference and difference threshold, the outputting alarm when difference is greater than difference threshold.It is alerted as a result, when the detection voltage difference of some period exceeds preset difference value thresholding, takes error protection measure in advance, avoid damaging power amplifying device, solve the problems, such as the equipment damage of long-standing problem power amplifier.
Description
Technical field
The present invention relates to field of circuit technology, and in particular to a kind of function discharge protection circuit and method.
Background technique
As the important composition equipment in communication and special despatch system, the stabilization of power amplifier (that is, power amplifier) work
Reliably it is directly related to the working effect of whole system.However since power amplifier is powerful device, there is high-power set
The features such as standby intrinsic feature, electric current is big, temperature is high, load-sensitive when such as working, job stability and reliability will be by
Many external factor, the influence of temperature, frequency variation etc..The equipment that is connected before and after power amplifier and environment it is any
Exception is likely to even damage power amplifier at catastrophe failure by " amplification " here in power amplifier.Therefore all power amplifiers are all without exception
Design have a large amount of safeguard measures, overheating protection, open-circuit-protection etc., these extremely occur after prompt action play protect
Shield.
But have been found that although power amplifier has come into guard mode in practical applications, irreversible damage still has occurred
It is bad, i.e., do not reach desired protecting effect.
Summary of the invention
The present invention provides a kind of discharge protection circuit and methods, and to solve existing protection circuit, the phase is not achieved in protection lag
The technical issues of protecting effect of prestige.
In order to reach above-mentioned technical purpose, the technical solution of the application is achieved in that
According to the one aspect of the application, a kind of function discharge protection circuit is provided, comprising: first order comparison circuit, and
With the concatenated second level comparison circuit of first order comparison circuit；
The first order comparison circuit includes the first operational amplifier, current time for receiving input corresponding power
Detect voltage value and before current time predetermined time power detection voltage value, and the difference both obtained after being compared
The difference is exported wherein inputting all the way as second level comparison circuit by value；
The second level comparison circuit includes the second comparator, for receiving the difference of the first order comparison circuit output
And preset difference value thresholding is received, and the difference and the difference threshold, when the difference is greater than the difference threshold
When outputting alarm.
Optionally, the first operational amplifier includes first input end, the second input terminal and the first output end；
The first input end is connect with signal source, receives the current time corresponding power detection electricity of signal source input
Pressure；
Second input terminal is connect with the output end of the first digital analog converter, the input terminal of first digital analog converter
It is connect with processor, the output end connection of the processor and analog-digital converter, the input terminal and signal of the analog-digital converter
Source connection, receives the corresponding power detection voltage of predetermined time before the current time of signal source input；
First output end is connect with the second comparator, and it is corresponding that output first operational amplifier compares current time
Power detection voltage and the difference that is obtained after the corresponding power detection voltage of predetermined time after current time to described
Two comparators.
Optionally, the second comparator includes third input terminal, the 4th input terminal and second output terminal；
The third input terminal is connect with first output end, receives the current time pair of the first operational amplifier output
The power detection voltage answered and before current time the corresponding power detection voltage of predetermined time difference；
4th input terminal is connect with the output end of the second digital analog converter, the input terminal of second digital analog converter
It is connected to the processor, receives preset difference value thresholding；
The second output terminal is connected to the processor, for exporting the first comparator difference and institute
State difference threshold and when the difference is greater than the difference threshold alarm signal that generates to the processor.
Optionally, the first input end is the positive input of the first operational amplifier, the positive input first
One end of resistance and one end connection of 3rd resistor, the other end of the first resistor are connect with signal source, the third electricity
The other end of resistance is grounded；
Second input terminal is the reverse input end of the first operational amplifier, the reverse input end and second resistance
One end and the connection of one end of the 4th resistance, the other end of the second resistance are connect with the output end of the first digital analog converter,
The other end of 4th resistance is connect with first output end.
Optionally, the third input terminal is the positive input of second comparator, and the 4th input terminal is institute
The reverse input end of the second comparator is stated, the reverse input end is connect with the output end of second digital analog converter.
Optionally, the processor includes having serial peripheral equipment interface SPI and direct memory access controller
Processor.
According to further aspect of the application, a kind of power amplification protecting method is provided, comprising:
Obtain current time corresponding power detection voltage value and before current time predetermined time power detection electricity
Pressure value,
Compare current time corresponding power detection voltage value and before current time predetermined time power detection electricity
The difference of the two is obtained after pressure value；
By the difference compared with preset difference value thresholding, the outputting alarm when the difference is greater than the difference threshold.
Optionally, obtain current time corresponding power detection voltage value and before current time predetermined time power
Detecting voltage value includes:
The first input end of first operational amplifier is connect with signal source, the current time for receiving signal source input is corresponding
Power detection voltage；
Second input terminal of the first operational amplifier is connect with the output end of the first digital analog converter, first digital-to-analogue
The input terminal of converter is connect with processor, the output end connection of the processor and analog-digital converter, the analog-digital converter
Input terminal connect with signal source, receive signal source input current time before the corresponding power detection voltage of predetermined time；
First output end of the first operational amplifier is connect with the second comparator, output difference to described second compares
Device.
Optionally, include: compared with preset difference value thresholding by the difference
The third input terminal of second comparator is connect with first output end, receives the output of the first operational amplifier
Current time corresponding power detection voltage and before current time the corresponding power detection voltage of predetermined time difference；
4th input terminal of second comparator is connect with the output end of the second digital analog converter, second digital-to-analogue
The input terminal of converter is connected to the processor, and receives preset difference value thresholding；
The second output terminal of second comparator is connected to the processor, for exporting when the difference is greater than institute
The alarm signal generated when stating difference threshold gives the processor.
Optionally, the first input end by the first operational amplifier is connect with signal source includes:
Using the first input end as the positive input of the first operational amplifier, by first electricity of positive input
One end of resistance and one end connection of 3rd resistor, the other end of the first resistor is connect with signal source, the third electricity
The other end of resistance is grounded；
Using second input terminal as the reverse input end of the first operational amplifier, by the reverse input end and second
One end of resistance and the connection of one end of the 4th resistance, by the output of the other end of the second resistance and the first digital analog converter
End connection, the other end of the 4th resistance is connect with first output end.
The utility model has the advantages that being created on the basis of protection treatment mechanism of the embodiment of the present invention when analyzing current power amplifier failure
Property the absolute value detection for proposing transformation inaccuracy be judged as the measurement of accurate trend, that is, circuit is measured in real time, and
The difference of the corresponding voltage value of predetermined time, obtains signal intensity according to current time corresponding voltage value and before current time
Trend is taken error protection measure in advance, is avoided to equipment when the difference of some period exceeds preset difference value alarming threshold
It damages, successfully solves the problems, such as the damage of long-standing problem power amplifying device, there is important application in fields such as communication, military projects
And reference value.
Detailed description of the invention
Fig. 1 is the schematic illustration of the function discharge protection circuit of one embodiment of the invention；
Fig. 2 is the flow chart of the power amplification protecting method of one embodiment of the invention.
Specific embodiment
Design concept of the invention is: not reaching desired in practical applications for current power amplifier safeguard measure
The problem of protecting effect, is known after analysis, fails to be protection electricity all at present the main reason for reaching protection expectation
Road design is all based on subsequent judgement.I other words can just detect the event after power amplifier has occurred that serious malfunction
Barrier goes to take corresponding measure again, this just brings hysteresis quality, makes power amplifier under serious malfunction at continuous service one section
Between, to damage.
By taking big standing wave fault condition as an example.Reflection power mistake caused by due to matching or output cord contact are bad etc.
(big standing wave) is to endanger a kind of maximum fault condition to power amplifier greatly.At present there are two types of the big Design of Standing Wave Protection Circuit of mainstream,
One is the absolute values for judging reflection power, enter guard mode when reflection power is more than to a certain degree；Another kind is to compare
The relative value of backward power and forward power enters guard mode when backward power is more than the certain proportion of forward power.Before
A kind of detection of protected mode is accurate, but in default of the comparison of forward power, not can reflect standing-wave ratio, can bring mistake
Protection；Latter approach is more common, is able to reflect out standing-wave ratio, but since forward and reverse detection error can also occur often
Wrong report shield.It is crucial that either way, can be just detected after having occurred that serious standing wave reflection case
To big standing wave, various treatment measures are then taken by circuit again, there is hysteresis quality.From break down situation to be finally stopped output
Or the entire link time-consuming of drop volume output is usually in ten microseconds to (depend on physical circuit design) between tens of microseconds, i.e. power amplifier
Need the tens of microseconds that works in case of a fault.And the core devices power transistor of power amplifier is for significantly reflection power
Often extremely sensitive, some kinds of power amplifier is even only 3-5 microsecond for the tolerance time of big standing wave under total reflection, is more than this
A time will result in irreversible damage, and this is that the current power amplifier protection technique based on subsequent judgment method can not solve
Difficulty certainly.Though can not fundamentally protect equipment so that power amplifier can prompt malfunction.
In order to solve communication and special despatch field in important equipment that is, in power amplifier it is common due to failure
The hysteresis quality of protection processing leads to the problem of equipment damage or accidentally protection cause power amplifier cisco unity malfunction, proposes a kind of based on trend
The power amplifier error protection processing method of judgement is being examined by just persistently judging change in detection signal trend before the failure occurs
Just enter guard mode in advance after measuring anomaly trend signal, to accomplish to start to prevent in advance, enter power amplifier will not tight
Weight malfunction, to realize the purpose for protecting equipment not to be damaged.Specifically realize that failure is sentenced using two-stage series connection comparator
It is disconnected: wherein the first order be include that amplifier seeks difference circuit, the voltage for the whole story moment in more each period in real time believes
Number obtain its difference；And second level comparator is used for the difference compared with default alarming threshold, to obtain finally alerting letter
Number, and protection act is made accordingly.It is stressed below in conjunction with circuit of the attached drawing to the embodiment of the present application.
Referring to Fig. 1, this function discharge protection circuit of the present embodiment includes: first order comparison circuit, and with first order ratio
Compared with the concatenated second level comparison circuit of circuit；First order comparison circuit includes the first operational amplifier (referring to the function illustrated in Fig. 1
Put), current time for receiving input corresponding power detection voltage value and before current time predetermined time power
The difference for detecting voltage value, and both being obtained after being compared, by difference output as second level comparison circuit wherein all the way
Input；Second level comparison circuit includes the second comparator (referring to the comparator illustrated in Fig. 1), more electric for receiving the first order
The difference and reception preset difference value thresholding of road output, and compare difference and difference threshold, it is defeated when difference is greater than difference threshold
It alerts out.
It should be noted that be in the present embodiment by the voltage value at current time and voltage value before current time into
Row compares.From shown in Fig. 1 it is found that by resistance R1 reach the first operational amplifier "+" end (that is, non-inverting input terminal) signal be
Current time corresponding detection voltage, and synchronization appear in the first amplifier "-" end (that is, inverting input terminal) voltage be through
The signal of AD-DA transfer delay is crossed, conversion goes back to know that synchronization appears in the letter at the first amplifier "-" end (at signal source)
It number is to be generated before "+" end signal (such as before 5 microseconds) certainly.
Specifically, the first operational amplifier includes first input end, the second input terminal and the first output end referring to Fig. 1；
First input end is connect with signal source (referring to the detection signal input part illustrated in Fig. 1), receive signal source input it is current when
Carve corresponding power detection voltage；Second input terminal and the first digital analog converter (see the first D/A converter illustrated in Fig. 1)
Output end connection, the input terminal of the first digital analog converter connect with processor, and processor and analog-digital converter in Fig. 1 (see illustrating
A/D converter) output end connection, the input terminal of analog-digital converter (i.e. A/D converter in Fig. 1) and signal source (referring to
The detection signal input part illustrated in Fig. 1) connection, receive the corresponding power of predetermined time before the current time of signal source input
Detect voltage；First output end is connect with the second comparator, output difference to the second comparator.Using the first operational amplifier,
Power detection voltage is received, the real-time comparison of the voltage value of two different moments from the same signal source is realized.
Referring to Fig. 1, the second comparator includes third input terminal, the 4th input terminal and second output terminal；Third input terminal with
The connection of first output end receives current time corresponding power detection voltage and the current time of the output of the first operational amplifier
The difference of the corresponding power detection voltage of predetermined time before；4th input terminal is connect with the output end of the second digital analog converter,
The input terminal of second digital analog converter is connect with processor, receives preset difference value thresholding；Second output terminal is connect with processor, is used
The alarm signal generated when exporting difference greater than difference threshold is to processor.
As shown in Figure 1, first input end is the positive input of the first operational amplifier, positive input first resistor
The one end of (see the R1 in Fig. 1) and the connection of one end of 3rd resistor (see the R3 in Fig. 1), the other end and signal of first resistor
Source connection, the other end ground connection of 3rd resistor；Second input terminal is the reverse input end of the first operational amplifier, reverse input end
Connect with one end of one end of second resistance (see the R2 in Fig. 1) and the 4th resistance (see the R4 in Fig. 1), second resistance it is another
One end is connect with the output end of the first digital analog converter, and the other end of the 4th resistance is connect with the first output end.In the present embodiment
In, referring to Fig. 1, third input terminal is the positive input of the second comparator, and the 4th input terminal is the reversed defeated of the second comparator
Enter end, reverse input end is connect with the output end of the second digital analog converter.
Replace the power amplifier fault detection judged afterwards specific with Trend judgement as previously mentioned, the embodiment of the present invention is proposed
Realize circuit and method.It is brief and conveniently in order to discuss in view of the versatility between the various error protection principles of power amplifier,
The work of the protection circuit is illustrated for endangering power amplifier maximum standing wave situation in the embodiment of the present invention.
Protection for power amplifier standing wave failure, circuit are divided into detection and judgement processing two parts.Wherein detection part is main
It is to realize high speed power vs. voltage conversion in real time using coupling geophone part, performance number is characterized with the voltage value of different amplitudes.This
Partial circuit is consistent with prior art protection processing circuit, is all point two-way while detecting positive and reflection power size, will
Power detection voltage is output to control panel.
The improvement of the embodiment of the present invention handles part mainly for the judgement on control panel, to realize the circuit of Trend judgement
Instead of traditional based on the circuit judged afterwards.The principle of fault trend judgement is: the absolute sense value of coherent signal is greatly simultaneously
It not necessarily can determine that and malfunction have occurred, but the variable quantity of detected value in a short time is excessive, necessarily a kind of failure becomes
Gesture.In view of power detection voltage is a simulation continuous variable, the similar mutation from 0 to 1 will not occur, therefore completely can root
The unusual condition that may occur is predicted according to the variation curvature of the variable.The absolute value for becoming inaccuracy is measured as relative difference survey
Amount is provided alert by constantly calculating variation curvature.Its difficult point be how quickly to obtain detection voltage real value with it is previous
Difference between moment value.
One embodiment of the invention realizes the constant time lag of voltage signal by AD-DA process, solves above-mentioned difficult point.Tool
Body, shown in Figure 1, the course of work of the function discharge protection circuit of the present embodiment is:
Real-time reflection power detection voltage (input of detection signal) is divided into two-way after reaching control panel, wherein being real-time all the way
Signal is detected, is going directly to the subtraction circuit being made of high speed amplifier (model such as AD8056) and R1 to R4 this four resistance just
Input terminal, and another way goes to the high-speed AD-DA loop controlled by processor (arm processor).Signal is by analog-to-digital conversion AD device
The input end of analog signal of part enters, and processor reads AD as a result, again by the DMA ((Direct of processor by SPI interface
Memory Access, direct memory access (DMA)) directly to the first digital-to-analogue conversion DA device, the analog voltage of DA device is defeated in channel
Outlet is directly connected to the negative input end of subtraction circuit.The output for the subtraction circuit being made of power amplifier is directly connected to high-speed comparator
Anode, and the default benchmark (i.e. preset difference value thresholding) that the negative terminal of comparator is exported from another way DA.When the comparator
Anode be greater than negative terminal when, generate high level alarm signal, send processor back to and generate interruption, carry out corresponding troubleshooting.
It should be noted that processor includes the processing with SPI interface and dma controller in one embodiment of the invention
Device, for example, STM32F107.Select the SPI interface DMA ability for being primarily due to the processor of STM32F107 processor.Electricity
The AD device and DA device that road is selected are high speed serialization SPI interface device, can hang over the same SPI interface of processor
On, and its data format is 16, facilitates processing.In this way, the AD-DA treatment process of detection voltage is controlled in the DMA of processor
System is lower automatically continuously to be realized, is avoided and is caused different detection time intervals because processor to handle other work, influences
Accuracy in detection.And since DMA process itself is not interfered by the other work of processor, the delay of processor link is able to substantially
Fixed, the data transfer time of AD device and DA device itself is also relatively-stationary in the same circuit, to make entire
The delay of AD-DA link is substantially stationary.Calculated, the constant time lag for surveying the AD-DA processing branch of detectable voltage signals is about 5
Microseconds.Therefore, first order comparison circuit (comparison circuit of device that is, the first amplifier is made comparisons) actually compares in Fig. 1
It is the difference of the current detection voltage value of reflection power and the detection voltage value before about 5 microseconds.
The size of difference directly reflects fault trend before and after this 5 microsecond.When power amplifying device works normally, at each
In the period of such 5 microsecond, voltage difference is necessarily in a certain range, it is impossible to it changes a lot, and such as
Fruit loading condition is abnormal, and will find that voltage difference abruptly starts to increased dramatically in periods as some, from
And judge possible fault trend.The comparison circuit that the second comparator forms in Fig. 1 is exactly completed this and is compared, by will be real
Time difference value is compared with some preset maximum difference that the second digital analog converter exports, and obtains alarm signal.Alarm letter
Number with interrupt mode notifier processes device, processor takes that cutting is received and dispatched or the modes such as drop volume output take protection act in time, from
And it realizes and enters guard mode before power amplifying device enters severe fault condition.
It should be noted that processing mode and the above-mentioned big standing wave of power amplifier fault conditions other for overheat, overcurrent etc.
The protection circuit of failure is similar, that is to say, that circuit shown in Fig. 1 is completely suitable for the judgement and protection of different malfunctions.
When the protection of the other power amplifier failures of concrete application, by the superposition of several basic element circuits as shown in Figure 1, sentence is changed
It talks about, can be used for the circuit duplication in Fig. 1 to protect other power amplifier failure, need to only change and detect signal input sources in Fig. 1.And such as
Processor is using the processing for having 3 independent SPI interfaces in fruit Fig. 1, then the processor of multiple similar function discharge protection circuits can
To share.
Through overtesting, the function protection circuit that the technical program is realized is applied successfully in Mr. Yu's model power amplifying device, opens
Ten after guard time (referring to that power amplifier completes the time of rupturing duty output action) is occurred by original failure in the case of the big standing wave in road
Microsecond is significantly promoted to tens of microseconds is not equal into 2-3 microsecond after total reflection state, greatly improves equipment dependability,
Do not occur the phenomenon that power amplifier damage again.
In addition, the model of the electronic device in Fig. 1 is only to schematically illustrate, it is without being limited thereto, for example other classes can be used
Processor STM32F107 in the AD-DA branch of the processor alternate figures 1 of type realizes this function, but no matter which kind of uses instead
Processor can not bypass this circuit form, substantially still identical as the technical program.Likewise, if using other models instead
This programme also may be implemented in amplifier or comparator, but circuit form and structure are still identical as this programme.That is, the model of device is more
Change the reference not influenced to this circuit form.
An inventive concept is belonged to previous embodiment, the application one embodiment additionally provides a kind of power amplifier protection side
Method, referring to fig. 2, this method comprises:
Step S201, obtain current time corresponding power detection voltage value and before current time predetermined time function
Rate detects voltage value,
Step S202, compare current time corresponding power detection voltage value and before current time predetermined time function
The difference of the two is obtained after rate detection voltage value；
Step S203, it is defeated when the difference is greater than the difference threshold by the difference compared with preset difference value thresholding
It alerts out.
In one embodiment of the invention, step S201 is specifically included: by the first input end of the first operational amplifier
It is connect with signal source, receives the current time corresponding power detection voltage of signal source input；By the of the first operational amplifier
Two input terminals are connect with the output end of the first digital analog converter, and the input terminal of first digital analog converter is connect with processor,
The connection of the output end of the processor and analog-digital converter, the input terminal of the analog-digital converter are connect with signal source, receive letter
The corresponding power detection voltage of predetermined time before the current time of number source input；By the first output end of the first operational amplifier
It is connect with the second comparator, output difference to second comparator.
In one embodiment of the invention, step S202 is specifically included: by the third input terminal of the second comparator and institute
State the first output end connection, receive the first operational amplifier output current time corresponding power detection voltage and it is current when
The difference of the corresponding power detection voltage of predetermined time before quarter；By the 4th input terminal and the second digital-to-analogue of second comparator
The output end of converter connects, and the input terminal of second digital analog converter is connected to the processor, and receives preset difference value door
Limit；The second output terminal of second comparator is connected to the processor, for exporting when the difference is greater than the difference
The alarm signal generated when value thresholding gives the processor.
In one embodiment of the invention, the first input end of the first operational amplifier is connect with signal source and includes:
Using the first input end as the positive input of the first operational amplifier, by one end of the positive input first resistor
And 3rd resistor one end connection, the other end of the first resistor is connect with signal source, the 3rd resistor it is another
End ground connection；Using second input terminal as the reverse input end of the first operational amplifier, by the reverse input end and second
One end of resistance and the connection of one end of the 4th resistance, by the output of the other end of the second resistance and the first digital analog converter
End connection, the other end of the 4th resistance is connect with first output end.
It should be noted that power amplification protecting method shown in Fig. 2 is realized based on the circuit in Fig. 1, therefore related Fig. 2
More explanations of the realization step of shown power amplification protecting method can be found in the course of work in previous embodiment to circuit shown in Fig. 1
Explanation, which is not described herein again.
The above description is merely a specific embodiment, under above-mentioned introduction of the invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of the above embodiments.It will be understood by those skilled in the art that above-mentioned tool
Body description only preferably explains that the purpose of the present invention, protection scope of the present invention are subject to the protection scope in claims.
Claims (10)
1. a kind of function discharge protection circuit characterized by comprising first order comparison circuit, and with first order comparison circuit string
The second level comparison circuit of connection；
The first order comparison circuit includes the first operational amplifier, current time for receiving input corresponding power detection
Voltage value and before current time predetermined time power detection voltage value, and the difference both obtained after being compared will
The difference exports wherein inputting all the way as second level comparison circuit；
The second level comparison circuit includes the second comparator, for receive first order comparison circuit output difference and
Preset difference value thresholding, and the difference and the difference threshold are received, it is defeated when the difference is greater than the difference threshold
It alerts out.
2. function discharge protection circuit as described in claim 1, which is characterized in that the first operational amplifier includes first input end,
Second input terminal and the first output end；
The first input end is connect with signal source, receives the current time corresponding power detection voltage of signal source input；
Second input terminal is connect with the output end of the first digital analog converter, the input terminal of first digital analog converter and place
Device connection, the output end connection of the processor and analog-digital converter are managed, the input terminal and signal source of the analog-digital converter connect
It connects, receives the corresponding power detection voltage of predetermined time before the current time of signal source input；
First output end is connect with the second comparator, output difference to second comparator.
3. function discharge protection circuit according to claim 2, which is characterized in that the second comparator includes third input terminal, the
Four input terminals and second output terminal；
The third input terminal is connect with first output end, and the current time for receiving the output of the first operational amplifier is corresponding
Power detection voltage and before current time the corresponding power detection voltage of predetermined time difference；
4th input terminal is connect with the output end of the second digital analog converter, the input terminal of second digital analog converter and institute
Processor connection is stated, preset difference value thresholding is received；
The second output terminal is connected to the processor, the announcement generated when for exporting the difference greater than the difference threshold
Alert signal gives the processor.
4. function discharge protection circuit according to claim 2, which is characterized in that the first input end is the first operation amplifier
The positive input of device, one end of the positive input first resistor and one end connection of 3rd resistor, first electricity
The other end of resistance is connect with signal source, the other end ground connection of the 3rd resistor；
Second input terminal is the reverse input end of the first operational amplifier, one end of the reverse input end and second resistance
And the 4th resistance one end connection, the other end of the second resistance is connect with the output end of the first digital analog converter, described
The other end of 4th resistance is connect with first output end.
5. function discharge protection circuit according to claim 3, which is characterized in that the third input terminal compares for described second
The positive input of device, the 4th input terminal are the reverse input end of second comparator, the reverse input end and institute
State the output end connection of the second digital analog converter.
6. function discharge protection circuit according to claim 2, which is characterized in that the processor includes connecing with serial peripheral
The processor of mouth SPI and direct memory access controller.
7. a kind of power amplification protecting method characterized by comprising
Obtain current time corresponding power detection voltage value and before current time predetermined time power detection voltage value,
Compare current time corresponding power detection voltage value and before current time after the power detection voltage of predetermined time
It is worth the difference of the two；
By the difference compared with preset difference value thresholding, the outputting alarm when the difference is greater than the difference threshold.
8. power amplification protecting method as claimed in claim 7, which is characterized in that obtain current time corresponding power detection voltage
The value and power detection voltage value of predetermined time includes: before current time
The first input end of first operational amplifier is connect with signal source, receives the current time corresponding function of signal source input
Rate detects voltage；
Second input terminal of the first operational amplifier is connect with the output end of the first digital analog converter, first digital-to-analogue conversion
The input terminal of device is connect with processor, the connection of the output end of the processor and analog-digital converter, the analog-digital converter it is defeated
Enter end to connect with signal source, receives the corresponding power detection voltage of predetermined time before the current time of signal source input；
First output end of the first operational amplifier is connect with the second comparator, output difference to second comparator.
9. power amplification protecting method according to claim 8, which is characterized in that by the difference compared with preset difference value thresholding
Include:
The third input terminal of second comparator is connect with first output end, receives the current of the first operational amplifier output
Moment corresponding power detection voltage and before current time the corresponding power detection voltage of predetermined time difference；
4th input terminal of second comparator is connect with the output end of the second digital analog converter, second digital-to-analogue conversion
The input terminal of device is connected to the processor, and receives preset difference value thresholding；
The second output terminal of second comparator is connected to the processor, for exporting when the difference is greater than the difference
The alarm signal generated when value thresholding gives the processor.
10. power amplification protecting method according to claim 8, which is characterized in that described by the first of the first operational amplifier
Input terminal is connect with signal source
Using the first input end as the positive input of the first operational amplifier, by the positive input first resistor
One end and the connection of one end of 3rd resistor, the other end of the first resistor is connect with signal source, the 3rd resistor
Other end ground connection；
Using second input terminal as the reverse input end of the first operational amplifier, by the reverse input end and second resistance
One end and the 4th resistance one end connection, by the output end of the other end of the second resistance and the first digital analog converter company
It connects, the other end of the 4th resistance is connect with first output end.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756396A (en) * | 2020-07-15 | 2020-10-09 | 维沃移动通信有限公司 | Radio frequency circuit, electronic device, and control method |
| CN117092441A (en) * | 2023-10-17 | 2023-11-21 | 南京纳特通信电子有限公司 | Abnormal impact signal detection method and system and electromagnetic compatibility test method and system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331516A (en) * | 2000-06-21 | 2002-01-16 | 马科尼通讯股份有限公司 | Device and method for processing frequency signals |
| US20100240325A1 (en) * | 2007-10-19 | 2010-09-23 | Chengsheng Li | Compensating method for capacity of radio frequency module and a radio frequency module |
| US20110007434A1 (en) * | 2009-07-13 | 2011-01-13 | Asus Technology (Suzhou) Co. Ltd | Over current protecting device and method adapted to dc-dc converter |
| US8022770B1 (en) * | 2010-05-27 | 2011-09-20 | Skyworks Solutions, Inc. | System and method for preventing power amplifier supply voltage saturation |
| CN102246419A (en) * | 2008-12-15 | 2011-11-16 | 日本电气株式会社 | Power detection circuit, transmitter, and power detection method |
| CN102281036A (en) * | 2010-06-08 | 2011-12-14 | 佳律通信设备(上海)有限公司 | Standing-wave ratio detection and high-power protection circuit with self-adaptive control |
| US20130257543A1 (en) * | 2010-12-02 | 2013-10-03 | Huawei Technologies Co., Ltd. | Power amplifier protection circuit, communication device, and method |
| CN203387520U (en) * | 2013-08-05 | 2014-01-08 | 上海华测导航技术有限公司 | System for realizing ultra-wide band multichannel antenna standing wave detection and alarming function |
| CN204304936U (en) * | 2014-12-31 | 2015-04-29 | 陕西烽火电子股份有限公司 | A kind of rf power amplifier circuit being applied to ultrashort wave radio set |
| CN206060694U (en) * | 2016-08-23 | 2017-03-29 | 深圳市海能达通信有限公司 | A kind of protection circuit for power amplifier |
| WO2018058900A1 (en) * | 2016-09-29 | 2018-04-05 | 珠海格力电器股份有限公司 | Comparer delay correction circuit in adc, method and adc |
-
2018
- 2018-08-24 CN CN201810974722.5A patent/CN109257023B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331516A (en) * | 2000-06-21 | 2002-01-16 | 马科尼通讯股份有限公司 | Device and method for processing frequency signals |
| US20100240325A1 (en) * | 2007-10-19 | 2010-09-23 | Chengsheng Li | Compensating method for capacity of radio frequency module and a radio frequency module |
| CN102246419A (en) * | 2008-12-15 | 2011-11-16 | 日本电气株式会社 | Power detection circuit, transmitter, and power detection method |
| US20110007434A1 (en) * | 2009-07-13 | 2011-01-13 | Asus Technology (Suzhou) Co. Ltd | Over current protecting device and method adapted to dc-dc converter |
| US8022770B1 (en) * | 2010-05-27 | 2011-09-20 | Skyworks Solutions, Inc. | System and method for preventing power amplifier supply voltage saturation |
| CN102281036A (en) * | 2010-06-08 | 2011-12-14 | 佳律通信设备(上海)有限公司 | Standing-wave ratio detection and high-power protection circuit with self-adaptive control |
| US20130257543A1 (en) * | 2010-12-02 | 2013-10-03 | Huawei Technologies Co., Ltd. | Power amplifier protection circuit, communication device, and method |
| CN203387520U (en) * | 2013-08-05 | 2014-01-08 | 上海华测导航技术有限公司 | System for realizing ultra-wide band multichannel antenna standing wave detection and alarming function |
| CN204304936U (en) * | 2014-12-31 | 2015-04-29 | 陕西烽火电子股份有限公司 | A kind of rf power amplifier circuit being applied to ultrashort wave radio set |
| CN206060694U (en) * | 2016-08-23 | 2017-03-29 | 深圳市海能达通信有限公司 | A kind of protection circuit for power amplifier |
| WO2018058900A1 (en) * | 2016-09-29 | 2018-04-05 | 珠海格力电器股份有限公司 | Comparer delay correction circuit in adc, method and adc |
Non-Patent Citations (2)
| Title |
|---|
| 何惠森: "基于AC-DC开关电源系统的电磁兼容设计及稳定性研究", 《中国博士学位论文全文数据库信息科技辑》 * |
| 邹炜: "基于多核处理架构的功放实时保护电路设计", 《电子产品世界》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756396A (en) * | 2020-07-15 | 2020-10-09 | 维沃移动通信有限公司 | Radio frequency circuit, electronic device, and control method |
| CN117092441A (en) * | 2023-10-17 | 2023-11-21 | 南京纳特通信电子有限公司 | Abnormal impact signal detection method and system and electromagnetic compatibility test method and system |
| CN117092441B (en) * | 2023-10-17 | 2023-12-19 | 南京纳特通信电子有限公司 | Abnormal impact signal detection method and system and electromagnetic compatibility test method and system |
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| CN109257023B (en) | 2022-10-14 |
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