CN109856457A - A kind of self-adapting load impedance detection system and method - Google Patents
A kind of self-adapting load impedance detection system and method Download PDFInfo
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Abstract
The present invention relates to a kind of self-adapting load impedance detection system and method, including input terminal SPO, input terminal SI1, input terminal SI2, output end SNO, output end So1, output end So2, Current Voltage converting unit ICV, the first variable gain amplifier VA1, the second variable gain amplifier VA2, the first amplitude voltage converting unit AD1, the second amplitude voltage converting unit AD2, compare control unit CCU, phase discriminator PHD and output computing unit OCU.The present invention can be adaptively adjusted circuit state to adapt to varying input signal intensity and without using radio frequency finder, have the advantages that circuit structure is simply easily realized and it is accurate to detect.
Description
Technical field
The present invention relates to load impedance detection field, especially a kind of self-adapting load impedance detection system and method.
Background technique
How robustly the load condition of self-adapting detecting circuit system is the important link of radio frequency arts.It is current public
Open the load impedance detection method for lacking in technology and can be realized low cost, wide spectrum, wide input intensity range.
Bibliography " impedance measurement of narrowband low voltage power line communication channel and specificity analysis " (electronic measurement technique, 2013
The 3rd phase of volume 35) propose technology it is as shown in Figure 3 and Figure 4.It is a kind of impedance measurement based on FRA impedance measurement adapter
Technology.The technology needs to provide the sinusoidal signal of input, and realizes by the way of being mixed using orthogonal local oscillation to signal amplitude
Measurement, and the phase difference of the two is obtained after needing to acquire the phase value of voltage and current simultaneously.Method is complicated, and can be realized
It has a single function.
Bibliography " the simple impedance measuring instrument based on AD8302 " (electronic measurement technique, the 2nd phase of volume 39 in 2016)
It is middle that a kind of impedometer is constituted using reflectometer circuit, AD8302 width phase detecting circuit etc., as described in Figure 5.The technology needs
Incoming signal and reflection signal are obtained using reflectometer circuit, and reflectometer circuit can only often realize high-frequency narrow-band spy
Property, especially it is difficult to realize in low-frequency range.Meanwhile the AD8302 internal structure that the technology uses is not as shown in fig. 6, due to adopting
With gain negative feedback technology, the input signal strength range allowed is smaller.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of self-adapting load impedance detection system and method, it can be adaptive
Ground adjustment circuit state is answered to adapt to varying input signal intensity and without using radio frequency finder, has circuit structure simply easy
It realizes and detects accurate advantage.
The present invention is realized using following scheme: a kind of self-adapting load impedance detection system, including input terminal SPO, input
Hold SI1, input terminal SI2, output end SNO, output end So1, output end So2, Current Voltage converting unit ICV, the first variable increasing
Beneficial amplifier VA1, the second variable gain amplifier VA2, the first amplitude voltage converting unit AD1, the conversion of the second amplitude voltage are single
First AD2, compare control unit CCU, phase discriminator PHD and output computing unit OCU.
The input terminal of the Current Voltage converting unit ICV is connected to input terminal SPO, the Current Voltage converting unit
The first output end of ICV is respectively connected to the input terminal of output end SNO, the first variable gain amplifier VA1, the Current Voltage
The second output terminal of converting unit ICV is connected to the input terminal of the second variable gain amplifier VA2；First variable gain is put
The output end of big device VA1 be respectively connected to the input terminal of the first amplitude voltage converting unit AD1, phase discriminator PHD first
Input terminal；The output end of the second variable gain amplifier VA2 is respectively connected to the defeated of the second amplitude voltage converting unit AD2
Enter second input terminal at end, phase discriminator PHD；Output end, second amplitude electricity of the first amplitude voltage converting unit AD1
The output end of pressure converting unit AD2 is respectively connected to relatively first input end, second input terminal of control unit CCU；Institute
State the third input terminal for comparing control unit CCU, the 4th input terminal is respectively connected to input terminal SI1, input terminal SI2, the ratio
The first output end compared with control unit CCU is respectively connected to the feedback input end of the first variable gain amplifier VA1, second variable
The feedback input end of gain amplifier VA2；The output of the output end of the phase discriminator PHD, the first amplitude voltage converting unit AD1
End, the second amplitude voltage converting unit AD2 output end and compare control unit CCU second output terminal be connected to it is described
Export the input terminal of computing unit OCU；The first output end of the output computing unit OCU, second output terminal are respectively connected to
Output end So1, output end So2.
Further, the Current Voltage converting unit ICV turns the current value that output end SNO is flow to from input terminal SPO
It is changed to signal S1；The first variable gain amplifier VA1 carries out gain using the signal of output end SNO as input signal, to it
Output signal S2 is generated after amplification；The second variable gain amplifier VA2 carries out gain using signal S1 as input signal, to it
Output signal S3 is generated after amplification；The first amplitude voltage converting unit AD1 carries out width using signal S2 as input signal, to it
Degree detects and generates the signal S4 of DC voltage Yu signal S2 amplitude proportional；Second amplitude voltage converting unit AD2 is with signal
S3 is input signal, carries out amplitude detection to it and generates the signal S5 of DC voltage Yu signal S3 amplitude proportional；Compare control
Unit CCU processed using signal S4 and signal S5 as input signal, according to the input threshold value Si1 of input terminal SI1 and input terminal SI2 and
The size of Si2 is compared judgement to the DC voltage of signal S4 and signal S5, generates gain control signal S6 and S8, wherein
Signal S6 feeds back to the first variable gain amplifier VA1 and the second variable gain amplifier VA2 to carry out gain adjustment to it, believes
Number S8 input to output computing unit OCU；Phase discriminator PHD using signal S2 and signal S3 as input signal, detection signal S2 and
Phase difference between signal S3 simultaneously generates the DC voltage signal S7 directly proportional to phase difference；Computing unit OCU is exported with signal
S4, signal S5, signal S7 and signal S8 generate final load impedance real part measured value So1 and load resistance as input signal
Anti- imaginary part measured value So2, and it is transmitted separately to output end So1, output end So2.
Further, the relatively control unit CCU is according to input threshold value Si1 and input threshold value Si2 to signal S4 and letter
Number S5 carries out the following conditions multilevel iudge, and wherein Si1 and Si2 indicates two different input threshold values, and has Si1 > Si2:
Condition one: when the DC voltage value of signal S4 or signal S5 are greater than input threshold value Si1, the DC voltage of signal S6 is reduced
To reduce the gain of the first variable gain amplifier VA1 and the second variable gain amplifier VA2, wherein the first variable gain is amplified
Device VA1, the gain of the second variable gain amplifier VA2 are directly proportional to control signal DC voltage；
Condition two: when the DC voltage of signal S4 and signal S5 be respectively less than input threshold value Si2 when, increase signal S6 DC voltage with
Improve the gain of the first variable gain amplifier VA1, the second variable gain amplifier VA2；
When condition one and condition two are all unsatisfactory for, signal S6 DC voltage is remained unchanged；When condition one and condition two are all discontented
When sufficient, signal S8 is set as effective status, is otherwise provided as invalid state.
Further, the course of work of the computing unit OCU are as follows: without loss of generality, if Current Voltage converting unit ICV
Conversion gain be RM；When signal S8 is in invalid state, keep the value of So1 and So2 constant；When signal S8 is in effective shape
When state, the voltage value of signal S5 is obtained into parameter a divided by the voltage value of signal S4, by RM multiplied by angle represented by signal S7
Cosine value and again divided by the value map updating obtained after a be So1 value, by RM multiplied by angle represented by signal S7 sine value simultaneously
The value for being again So2 divided by the value map updating obtained after a.
Compared with prior art, the invention has the following beneficial effects: a kind of self-adapting load impedance inspection proposed by the present invention
Examining system and method can be adaptively adjusted circuit state to adapt to varying input signal intensity and orient without using radio frequency
Device has the advantages that circuit structure is simply easily realized and it is accurate to detect.Technical solution of the present invention can be logical in wireless charging, radio frequency
Accurate impedance measurement is provided in the application scenarios such as letter, to realize impedance matching between information source and load.
Detailed description of the invention
Fig. 1 is the self-adapting load impedance detection system schematic of the embodiment of the present invention.
Fig. 2 is the schematic diagram of internal structure of the self-adapting load impedance detection system of the embodiment of the present invention.
Fig. 3 is the background technique schematic diagram 1 of the embodiment of the present invention.
Fig. 4 is the background technique schematic diagram 2 of the embodiment of the present invention.
Fig. 5 is the background technique schematic diagram 3 of the embodiment of the present invention.
Fig. 6 is the background technique schematic diagram 4 of the embodiment of the present invention.
Fig. 7 is the application method schematic diagram of the impedance measurement system of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Figure 1 and Figure 2, a kind of self-adapting load impedance detection system is present embodiments provided, including input terminal SPO,
Input terminal SI1, input terminal SI2, output end SNO, output end So1, output end So2, Current Voltage converting unit ICV, first can
Variable-gain amplifier VA1, the second variable gain amplifier VA2, the first amplitude voltage converting unit AD1, the second amplitude voltage turn
It changes unit AD2, compare control unit CCU, phase discriminator PHD and output computing unit OCU.
The input terminal of the Current Voltage converting unit ICV is connected to input terminal SPO, the Current Voltage converting unit
The first output end of ICV is respectively connected to the input terminal of output end SNO, the first variable gain amplifier VA1, the Current Voltage
The second output terminal of converting unit ICV is connected to the input terminal of the second variable gain amplifier VA2；First variable gain is put
The output end of big device VA1 be respectively connected to the input terminal of the first amplitude voltage converting unit AD1, phase discriminator PHD first
Input terminal；The output end of the second variable gain amplifier VA2 is respectively connected to the defeated of the second amplitude voltage converting unit AD2
Enter second input terminal at end, phase discriminator PHD；Output end, second amplitude electricity of the first amplitude voltage converting unit AD1
The output end of pressure converting unit AD2 is respectively connected to relatively first input end, second input terminal of control unit CCU；Institute
State the third input terminal for comparing control unit CCU, the 4th input terminal is respectively connected to input terminal SI1, input terminal SI2, the ratio
The first output end compared with control unit CCU is respectively connected to the feedback input end of the first variable gain amplifier VA1, second variable
The feedback input end of gain amplifier VA2；The output of the output end of the phase discriminator PHD, the first amplitude voltage converting unit AD1
End, the second amplitude voltage converting unit AD2 output end and compare control unit CCU second output terminal be connected to it is described
Export the input terminal of computing unit OCU；The first output end of the output computing unit OCU, second output terminal are respectively connected to
Output end So1, output end So2.
In the present embodiment, the Current Voltage converting unit ICV will flow to the electric current of output end SNO from input terminal SPO
Value is converted to signal S1；The first variable gain amplifier VA1 carries out it using the signal of output end SNO as input signal
Output signal S2 is generated after gain amplification；The second variable gain amplifier VA2 carries out it using signal S1 as input signal
Output signal S3 is generated after gain amplification；The first amplitude voltage converting unit AD1 using signal S2 as input signal, to its into
Line amplitude detects and generates the signal S4 of DC voltage Yu signal S2 amplitude proportional；Second amplitude voltage converting unit AD2 with
Signal S3 is input signal, carries out amplitude detection to it and generates the signal S5 of DC voltage Yu signal S3 amplitude proportional；Than
Compared with control unit CCU using signal S4 and signal S5 as input signal, according to the input threshold value of input terminal SI1 and input terminal SI2
The size of Si1 and Si2 is compared judgement to the DC voltage of signal S4 and signal S5, generates gain control signal S6 and S8,
Wherein signal S6 feeds back to the first variable gain amplifier VA1 and the second variable gain amplifier VA2 to carry out gain tune to it
It is whole, signal S8 input to output computing unit OCU；Phase discriminator PHD detects signal using signal S2 and signal S3 as input signal
Phase difference between S2 and signal S3 simultaneously generates the DC voltage signal S7 directly proportional to phase difference；Export computing unit OCU with
Signal S4, signal S5, signal S7 and signal S8 generate final load impedance real part measured value So1 and bear as input signal
Imaginary impedance measured value So2 is carried, and is transmitted separately to output end So1, output end So2.
In the present embodiment, the relatively control unit CCU is according to input threshold value Si1 and input threshold value Si2 to signal S4
With signal S5 carry out the following conditions multilevel iudge, wherein Si1 and Si2 indicates two different input threshold values, and have Si1 >
Si2:
Condition one: when the DC voltage value of signal S4 or signal S5 are greater than input threshold value Si1, the DC voltage of signal S6 is reduced
To reduce the gain of the first variable gain amplifier VA1 and the second variable gain amplifier VA2, wherein the first variable gain is amplified
Device VA1, the gain of the second variable gain amplifier VA2 are directly proportional to control signal DC voltage；
Condition two: when the DC voltage of signal S4 and signal S5 be respectively less than input threshold value Si2 when, increase signal S6 DC voltage with
Improve the gain of the first variable gain amplifier VA1, the second variable gain amplifier VA2；
When condition one and condition two are all unsatisfactory for, signal S6 DC voltage is remained unchanged；When condition one and condition two are all discontented
When sufficient, signal S8 is set as effective status, is otherwise provided as invalid state.
In the present embodiment, the course of work of the computing unit OCU are as follows: without loss of generality, if Current Voltage conversion is single
The conversion gain of first ICV is RM；When signal S8 is in invalid state, keep the value of So1 and So2 constant；When signal S8 is in
When effective status, the voltage value of signal S5 is obtained into parameter a divided by the voltage value of signal S4, by RM multiplied by represented by signal S7
The cosine value of angle and the value for being again So1 divided by the value map updating obtained after a, just multiplied by angle represented by signal S7 by RM
String value and the value for being again So2 divided by the value map updating obtained after a.
Preferably, compared to bibliography " impedance measurement of narrowband low voltage power line communication channel and specificity analysis " (electronic, horological
Amount technology, the 3rd phase of volume 35 in 2013) technical solution that is proposed.The present embodiment is that passive measurement technology does not need to provide
Input sinusoidal signal, and only need to using using simple rectifier as amplitude voltage converting unit can to amplitude measurement,
It needs to obtain the phase difference of the two after acquiring the phase value of voltage and current simultaneously compared to bibliography, the present embodiment can be direct
Acquire the phase difference.Meanwhile the present embodiment using variable gain amplifier, amplitude voltage converting unit and compare control unit come
Constitute negative-feedback, enable measuring system that can all work normally under different input signal strengths, and bibliography technology without
This function.
Preferably, compared to bibliography " the simple impedance measuring instrument based on AD8302 " (electronic measurement technique, 2016
The 2nd phase of volume 39) technical solution that is proposed, simple sample resistance can be used as Current Voltage converting unit in the present embodiment
To obtain the value of current signal, thus higher operating frequency range can be obtained.Meanwhile the present embodiment is due to using gain
Negative-feedback technology, thus its input signal strength range allowed is larger.
Particularly, as shown in fig. 7, Fig. 7 shows the application method for the impedance measurement system that this patent proposes.When being surveyed
When amount, information source (11) is connected with input terminal SP0, load (12) is connected with output end SN0, while defeated using voltage bias (13)
It two threshold voltages and is input in SI1 and SI2 out；Then output is mapped in port So1 and So2 by impedance test results.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
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.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (4)
1. a kind of self-adapting load impedance detection system, it is characterised in that: including input terminal SPO, input terminal SI1, input terminal
SI2, output end SNO, output end So1, output end So2, Current Voltage converting unit ICV, the first variable gain amplifier VA1,
Second variable gain amplifier VA2, the first amplitude voltage converting unit AD1, the second amplitude voltage converting unit AD2, compare control
Unit CCU, phase discriminator PHD and output computing unit OCU processed；
The input terminal of the Current Voltage converting unit ICV is connected to input terminal SPO, the Current Voltage converting unit ICV's
First output end is respectively connected to the input terminal of output end SNO, the first variable gain amplifier VA1, the Current Voltage conversion
The second output terminal of unit ICV is connected to the input terminal of the second variable gain amplifier VA2；First variable gain amplifier
The output end of VA1 is respectively connected to the first input of the input terminal of the first amplitude voltage converting unit AD1, phase discriminator PHD
End；The output end of the second variable gain amplifier VA2 is respectively connected to the input of the second amplitude voltage converting unit AD2
It holds, the second input terminal of phase discriminator PHD；Output end, second amplitude voltage of the first amplitude voltage converting unit AD1
The output end of converting unit AD2 is respectively connected to relatively first input end, second input terminal of control unit CCU；It is described
Compare the third input terminal of control unit CCU, the 4th input terminal is respectively connected to input terminal SI1, input terminal SI2, the comparison
The first output end of control unit CCU is respectively connected to the feedback input end of the first variable gain amplifier VA1, the second variable increasing
The feedback input end of beneficial amplifier VA2；The output of the output end of the phase discriminator PHD, the first amplitude voltage converting unit AD1
End, the second amplitude voltage converting unit AD2 output end and compare control unit CCU second output terminal be connected to it is described
Export the input terminal of computing unit OCU；The first output end of the output computing unit OCU, second output terminal are respectively connected to
Output end So1, output end So2.
2. a kind of detection method based on self-adapting load impedance detection system described in claim 1, it is characterised in that: described
The current value for flowing to output end SNO from input terminal SPO is converted to signal S1 by Current Voltage converting unit ICV；Described first can
Variable-gain amplifier VA1 generates output signal S2 after carrying out gain amplification to it using the signal of output end SNO as input signal；
The second variable gain amplifier VA2 generates output signal S3 after carrying out gain amplification to it using signal S1 as input signal；
The first amplitude voltage converting unit AD1 carries out amplitude detection to it and generates DC voltage using signal S2 as input signal
With the signal S4 of signal S2 amplitude proportional；Second amplitude voltage converting unit AD2 carries out it using signal S3 as input signal
Amplitude detection and the signal S5 for generating DC voltage Yu signal S3 amplitude proportional；Compare control unit CCU with signal S4 and letter
Number S5 is as input signal, according to the size of input the threshold value Si1 and Si2 of input terminal SI1 and input terminal SI2, to signal S4 and
The DC voltage of signal S5 is compared judgement, generates gain control signal S6 and S8, and wherein it is variable to feed back to first by signal S6
To carry out gain adjustment to it, signal S8 input to output calculates single gain amplifier VA1 and the second variable gain amplifier VA2
First OCU；Phase discriminator PHD is using signal S2 and signal S3 as input signal, and the phase difference between detection signal S2 and signal S3 is simultaneously
Generate the DC voltage signal S7 directly proportional to phase difference；Computing unit OCU is exported with signal S4, signal S5, signal S7 and letter
Number S8 generates final load impedance real part measured value So1 and load impedance imaginary part measured value So2 as input signal, and will
It is transmitted separately to output end So1, output end So2.
3. a kind of self-adapting load impedance detection method according to claim 2, it is characterised in that: described relatively to control list
First CCU carries out the following conditions multilevel iudge to signal S4 and signal S5 according to input threshold value Si1 and input threshold value Si2, wherein Si1
It is two different input threshold values with Si2, and has Si1 > Si2:
Condition one: when the DC voltage value of signal S4 or signal S5 are greater than input threshold value Si1, the DC voltage of signal S6 is reduced
To reduce the gain of the first variable gain amplifier VA1 and the second variable gain amplifier VA2, wherein the first variable gain is amplified
Device VA1, the gain of the second variable gain amplifier VA2 are directly proportional to control signal DC voltage；
Condition two: when the DC voltage of signal S4 and signal S5 be respectively less than input threshold value Si2 when, increase signal S6 DC voltage with
Improve the gain of the first variable gain amplifier VA1, the second variable gain amplifier VA2；
When condition one and condition two are all unsatisfactory for, signal S6 DC voltage is remained unchanged；When condition one and condition two are all discontented
When sufficient, signal S8 is set as effective status, is otherwise provided as invalid state.
4. a kind of self-adapting load impedance detection method according to claim 2, it is characterised in that: the computing unit
The course of work of OCU are as follows: set the conversion gain of Current Voltage converting unit ICV as RM；When signal S8 is in invalid state, protect
The value for holding So1 and So2 is constant；When signal S8 is in effective status, by the voltage value of signal S5 divided by the voltage value of signal S4
And parameter a is obtained, it multiplied by the cosine value of angle represented by signal S7 and is again So1 divided by the value map updating obtained after a by RM
Value, by RM multiplied by angle represented by signal S7 sine value and again divided by the value map updating obtained after a be So2 value.
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| CN117517777A (en) * | 2024-01-05 | 2024-02-06 | 季华实验室 | Amplitude and phase detection circuit and impedance matcher |
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