CN102723922A - Automatic amplitude control loop and control method thereof - Google Patents
Automatic amplitude control loop and control method thereof Download PDFInfo
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- CN102723922A CN102723922A CN2012101997418A CN201210199741A CN102723922A CN 102723922 A CN102723922 A CN 102723922A CN 2012101997418 A CN2012101997418 A CN 2012101997418A CN 201210199741 A CN201210199741 A CN 201210199741A CN 102723922 A CN102723922 A CN 102723922A
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Abstract
The invention relates to the field of power line carrier communication and discloses an automatic amplitude control loop and a control method thereof. According to the invention, the output power of a power amplifier is subjected to adaptive control by adopting an automatic amplitude control loop, the power amplifier is controlled more accurately and flexibly, the output power and high linearity of the power amplifier are balanced well, constant-power output of a power line carrier communication system can be ensured, and the communication quality of the power line carrier communication system is improved effectively; and a two-way analog to digital converter is adopted, an automatic amplitude control circuit is processed in a numerical field, each parameter of the automatic amplitude control circuit can be configured flexibly, and the control accuracy and the trend range of the automatic amplitude control circuit are improved.
Description
Technical field
The present invention relates to the power line carrier communication field, particularly the power amplifier output power adaptive control technology.
Background technology
Power-line carrier communication system utilizes power line as communication media, through to modulating and demodulating signal, realizes utilizing the purpose of power line transmission data.Owing to low-voltage power line is laid for electric energy transmitting, so the load characteristic of power line has very large time variation, meeting variation in very large range along with sending signal frequency and change of time.For example, for the carrier signal of conform european standard EN-50065 standard, between the 145KHz, and for the carrier signal of this frequency range, the load of power line can change between 0.5 ohm to 50 ohm its frequency usually at 9KHz.
Load variations amplitude just because of power line is very big; And the power amplifier in the power-line carrier communication system often adopts the AB power-like amplifier, and perhaps the D power-like amplifier that is to say; What adopt all is the fixing power amplifier of multiplication factor; Therefore, will cause the power output of power amplifier to change with the variation of power line load, this be because:
R wherein
sBe power line load, U
OutBe output signal amplitude, P
OutBe output signal power.Visible by above-mentioned formula, as amplitude output signal U
OutKeep one regularly, power line load R
sWhen changing greatly, for example, R
sWhen between 50 ohm, changing for 0.5 ohm, the power output P of power amplifier
OutAlso can constantly change, so then be difficult to guarantee effectively the communication performance of power-line carrier communication system thereupon changing.
Therefore; How to improve the problem that existing power-line carrier communication system intermediate power amplifier exists; Thereby make power-line carrier communication system obtain the output of permanent power, the communication quality of raising power-line carrier communication system becomes the technical task that those skilled in the art need to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of automatic amplitude control loop and control method thereof; Accurate more and flexible to the control of power amplifier; Between the power output of power amplifier and high linearity, find best balance point; Can guarantee that power-line carrier communication system obtains the output of permanent power, effectively improves the communication quality of power-line carrier communication system.
For solving the problems of the technologies described above, execution mode of the present invention discloses a kind of automatic amplitude control loop, comprises power amplifier, automatic amplitude control circuit and variable gain amplifier;
Automatic amplitude control circuit is used for the power output of power amplifier is compared with preset target power, and gives variable gain amplifier according to comparative result output control corresponding sign indicating number;
Variable gain amplifier is used for the control code according to automatic amplitude control circuit output, the amplitude of sending signal is adjusted, and adjusted signal is sent to power amplifier.
Execution mode of the present invention also discloses a kind of control method of automatic amplitude control loop, may further comprise the steps:
Automatic amplitude control circuit compares the power output of power amplifier with preset target power, and gives variable gain amplifier according to comparative result output control corresponding sign indicating number;
Variable gain amplifier is adjusted the amplitude of sending signal according to control code, and adjusted signal is sent to power amplifier.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Adopt automatic amplitude control loop that the power output of power amplifier is carried out adaptive control; Accurate more and flexible to the control of power amplifier; Between the power output of power amplifier and high linearity, find best balance point; Can guarantee that power-line carrier communication system obtains the output of permanent power, effectively improves the communication quality of power-line carrier communication system.
Further; Automatic amplitude control circuit adopts the two-way analog to digital converter to convert the current signal and the voltage signal of power amplifier output to digital signal; Automatic amplitude control circuit is handled at numeric field; Can dispose the various parameters of automatic amplitude control circuit very neatly, improve the precision and the dynamic range of automatic amplitude control circuit control.
Further; Because power amplifier adopts High Voltage Power Supply; So the amplitude of oscillation of power amplifier output signal is very big; Substantially exceed the quantizing range of automatic amplitude control circuit, be input to again in the automatic amplitude control circuit behind the voltage and current process convergent-divergent with power amplifier output, can satisfy the dynamic range of automatic amplitude control circuit.
Further, adopt the AB power-like amplifier, can between the linearity and efficient, do good compromise, make power amplifier, improve the linearity and efficient as far as possible providing under the prerequisite of certain power output.
Description of drawings
Fig. 1 is the structural representation of a kind of automatic amplitude control loop in the first embodiment of the invention;
Fig. 2 is the structural representation of a kind of automatic amplitude control circuit in the first embodiment of the invention;
Fig. 3 is the structural representation of a kind of convergent-divergent circuit in the first embodiment of the invention;
Fig. 4 is the process of the setting up sketch map of a kind of automatic amplitude control loop in the first embodiment of the invention;
Fig. 5 is the schematic flow sheet of a kind of control method of automatic amplitude control loop in the second embodiment of the invention.
Embodiment
In following narration, many ins and outs have been proposed in order to make the reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that execution mode of the present invention is done to describe in detail further below.
First embodiment of the invention relates to a kind of automatic amplitude control loop.Fig. 1 is the structural representation of this automatic amplitude control loop.
Specifically, as shown in Figure 1, this automatic amplitude control loop comprises power amplifier 103, automatic amplitude control circuit 104 and variable gain amplifier 102.
Automatic amplitude control circuit 104 is used for the power output of power amplifier 103 is compared with preset target power, and gives variable gain amplifier 102 according to comparative result output control corresponding sign indicating number.
Further, as shown in Figure 2, comprise in this automatic amplitude control circuit 104:
Current channel analog to digital converter 201, voltage channel analog to digital converter 202, first low pass filter 203, multiplier 204, second low pass filter 205, comparator 206 and integrator 207.
Current channel analog to digital converter 201 is used for converting the current signal of power amplifier 103 outputs to digital signal.
Voltage channel analog to digital converter 202 is used for converting the voltage signal of power amplifier 103 outputs to digital signal.
Through current channel analog to digital converter 201 and voltage channel analog to digital converter 202; Convert the electric current and the voltage signal of power amplifier 103 outputs to digital signal; Follow-up so all power detection are all carried out at numeric field with control; Can dispose the various parameters of automatic amplitude control loop very flexibly, like the settling time of loop, the desired value of power output etc.
First low pass filter 203 is used for the signal of current channel analog to digital converter 201 and 202 outputs of voltage channel analog to digital converter is carried out LPF, removes certain high-frequency interferencing signal.
Second low pass filter 205 is used for the signal of multiplier 204 outputs is carried out LPF.
Comparator 206 is used for the signal of second low pass filter, 205 outputs is compared with preset target power.
Automatic amplitude control circuit 104 adopts two-way analog to digital converter 201 and 202 current signal and voltage signals with power amplifier 103 outputs to convert digital signal to; Automatic amplitude control circuit 104 is handled at numeric field; Can dispose the various parameters of automatic amplitude control circuit 104 very neatly, improve the precision and the dynamic range of automatic amplitude control circuit 104.
The control signal of variable gain amplifier 102 is from the output of automatic amplitude control circuit 104; Amplitude to sending signal is controlled; This variable gain amplifier 102 can provide bigger dynamic range adjustment, can satisfy the requirement of different loads situation to output amplitude.
Also comprise in this automatic amplitude control loop: digital to analog converter and the 3rd low pass filter, shown in 301 among Fig. 1.
Digital to analog converter, the digital-to-analogue conversion that is used to realize sending signal, and the signal after will changing is exported to the 3rd low pass filter.
The 3rd low pass filter is used for the signal of digital to analog converter output is carried out LPF, and filtered signal is exported to variable gain amplifier.
Because power amplifier 103 adopts High Voltage Power Supply,, substantially exceeded the quantizing range of automatic amplitude control circuit 104 so the amplitude of oscillation of power amplifier 103 output signals is very big.
Therefore; In this automatic amplitude control loop, also comprise: the convergent-divergent circuit; Be connected between power amplifier 103 and the automatic amplitude control circuit 104, be used for being input to automatic amplitude control circuit 104 behind the voltage signal of power amplifier 103 output and the current signal convergent-divergent.
The voltage and current of power amplifier 103 outputs is input in the automatic amplitude control circuit 104 through behind the convergent-divergent again, can satisfies the dynamic range of automatic amplitude control circuit 104.
Specifically, as shown in Figure 3, comprise in this convergent-divergent circuit: transformer circuit 301, first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R sense and Voltage Reference VCM.
The output of power amplifier (being the A point among Fig. 3) is through transformer circuit 301 and the 4th resistance R sense ground connection.
The output of power amplifier (being the A point among Fig. 3) is connected with the voltage channel analog to digital converter 202 of automatic amplitude control circuit 104 with first resistance R 1 through first capacitor C 1.
Voltage Reference VCM is connected with the voltage channel analog to digital converter 202 of automatic amplitude control circuit 104 through second resistance R 2.
The non-earth terminal of the 4th resistance R sense (being the B point among Fig. 3) is connected with the current channel analog to digital converter 201 of automatic amplitude control circuit 104 through second capacitor C 2.
Voltage Reference VCM is connected with the current channel analog to digital converter 201 of automatic amplitude control circuit 104 through the 3rd resistance R 3.
As shown in Figure 3; Node A is the voltage signal output end of power amplifier 103; In order to link to each other, need carry out certain convergent-divergent to satisfy the dynamic range of voltage channel analog to digital converter 202 in the automatic amplitude control circuit 104 to the voltage signal of output with automatic amplitude control circuit 104.Resistance R 1 is accomplished the convergent-divergent to output voltage with the potential-divider network that R2 forms, and the power output control of zoom factor and automatic amplitude control circuit 104 is relevant, considers so need to cooperate automatic amplitude control circuit 104 to do compromise.Capacitor C 1 is a capacitance, the coupling of the AC signal in power amplifier 103 output voltages is come, and the dc point of automatic amplitude control circuit 104 is provided by Voltage Reference VCM.Node B is the output of power amplifier 103 current channels, and the electric current of power amplifier 103 outputs flows to ground through power line equivalent load and Rsense.Rsense is the current detection circuit of power amplifier 103; Be used for that current conversion with power amplifier 103 output becomes voltage signal and the current channel analog to digital converter 201 delivered in the automatic amplitude control circuit 104 is measured; Therefore, resistance R sense need be limited to and just can obtain reasonable current measurement precision in certain scope.
After voltage signal and current signal get into automatic amplitude control circuit 104; The power output of automatic amplitude control circuit 104 meeting monitor power amplifiers 103 also compares and exports the set of number control code with a target power and gives variable gain amplifier 102; Thereby change the amplitude of variable gain amplifier 102; The variation of variable gain amplifier 102 output amplitudes can cause the variation of power amplifier 103 power outputs; Power output after power amplifier 103 changes compares with target power again, thereby changes the output amplitude of variable gain amplifier 102 once more.Whole loop is constantly adjusted, and in the scope of power output at target power of power amplifier 103, this automatic amplitude control loop gets into stable state.Power amplifier 103 carries out permanent power output, and the adjustment settling time of power amplifier 103 and the adjustment of the target zone of step-length and power output can be carried out design flexible and configuration in automatic amplitude control circuit 104.Can carry out flexible configuration according to the concrete condition of power line carrier communication in the application, to satisfy power line in underloading, heavily loaded and near far-end communicating requirement improves communication quality.
Fig. 4 is the process of the setting up sketch map of this automatic amplitude control loop; A power output of the corresponding power amplifier 103 of each controlled step of automatic amplitude control circuit 104; Automatically after the amplitude control loop was stablized, power amplifier 103 reached final power output, because the employing of amplitude control loop automatically; Power amplifier 103 is when reaching optimum power output, and output that can guaranteed output amplifier 103 has certain linearity.In addition, automatically the settling time of amplitude control loop and adjustment step-length can programming Control, and the power output of power amplifier 103 also can be configured according to requirement of actual application, has realized the adjustment of maximum flexibility.
Preferably, in this execution mode, power amplifier 103 is the AB power-like amplifier.
Adopt the AB power-like amplifier, can between the linearity and efficient, do good compromise, make power amplifier, improve the linearity and efficient as far as possible providing under the prerequisite of certain power output.
Certainly, in some other execution mode of the present invention, also can select the power amplifier of other type for use.
Preferably, in this execution mode, this automatic amplitude control loop is applied in the power-line carrier communication system.
Likewise, in some other execution mode of the present invention, this automatic amplitude control loop also can be applied in other the Circuits System.
Adopt automatic amplitude control loop that the power output of power amplifier is carried out adaptive control; Accurate more and flexible to the control of power amplifier; Between the power output of power amplifier and high linearity, find best balance point; Can guarantee that power-line carrier communication system obtains the output of permanent power, effectively improves the communication quality of power-line carrier communication system.
Second embodiment of the invention relates to a kind of control method of automatic amplitude control loop.Fig. 5 is the schematic flow sheet of the control method of this automatic amplitude control loop.
Specifically, as shown in Figure 5, the control method of this automatic amplitude control loop may further comprise the steps:
In step 501, automatic amplitude control circuit compares the power output of power amplifier with preset target power.
Before step 501, further comprising the steps of:
Convert the current signal and the voltage signal of power amplifier output to digital signal.
Current signal that converts digital signal to and voltage signal are carried out LPF.
Voltage signal behind the LPF and current signal are multiplied each other, obtain the power output of power amplifier.
The power output of power amplifier is carried out LPF.
After this get into step 502, automatic amplitude control circuit is given variable gain amplifier according to comparative result output control corresponding sign indicating number.
In step 501 and 502, comprise following substep:
Comparator compares the power output of power amplifier with preset target power:
If the power output of power amplifier is greater than first thresholding, then the output valve of integrator subtracts 1;
If the power output of power amplifier is less than second thresholding, then the output valve of integrator adds 1;
If the power output of power amplifier is between first thresholding and second thresholding, then the output valve of integrator remains unchanged.
After this get into step 503, variable gain amplifier is adjusted the amplitude of sending signal according to control code.
After this get into step 504, variable gain amplifier sends to power amplifier with adjusted signal.
After this process ends.
This execution mode is and the corresponding method execution mode of first execution mode, this execution mode can with the enforcement of working in coordination of first execution mode.The correlation technique details of mentioning in first execution mode is still effective in this execution mode, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in this execution mode also can be applicable in first execution mode.
Each method execution mode of the present invention all can be realized with modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize; Instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable; Volatibility or non-volatile; Solid-state or non-solid-state, fixing perhaps removable medium or the like).Equally; Memory can for example be programmable logic array (Programmable Array Logic; Abbreviation " PAL "), random access memory (Random Access Memory; Abbreviation " RAM "), programmable read only memory (Programmable Read Only Memory is called for short " PROM "), read-only memory (Read-Only Memory is called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM; Abbreviation " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Though through reference some preferred implementation of the present invention; The present invention is illustrated and describes; But those of ordinary skill in the art should be understood that and can do various changes to it in form with on the details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. an automatic amplitude control loop is characterized in that, comprises power amplifier, automatic amplitude control circuit and variable gain amplifier;
Automatic amplitude control circuit is used for the power output of power amplifier is compared with preset target power, and gives variable gain amplifier according to comparative result output control corresponding sign indicating number;
Variable gain amplifier is used for the control code according to automatic amplitude control circuit output, the amplitude of sending signal is adjusted, and adjusted signal is sent to power amplifier.
2. automatic amplitude control loop according to claim 1 is characterized in that, comprises in the said automatic amplitude control circuit:
Current channel analog to digital converter, voltage channel analog to digital converter, first low pass filter, multiplier, second low pass filter, comparator and integrator;
The current channel analog to digital converter is used for converting the current signal of power amplifier output to digital signal;
The voltage channel analog to digital converter is used for converting the voltage signal of power amplifier output to digital signal;
First low pass filter is used for the signal of current channel analog to digital converter and the output of voltage channel analog to digital converter is carried out LPF;
Multiplier is used for the voltage signal and the current signal of the output of first low pass filter are multiplied each other, and obtains the power output of power amplifier;
Second low pass filter is used for the power signal of multiplier output is carried out LPF;
Comparator is used for the signal of second low pass filter output is compared with preset target power;
Integrator is used for carrying out integration and exporting the control corresponding sign indicating number to variable gain amplifier according to the result of comparator output.
3. automatic amplitude control loop according to claim 2 is characterized in that, also comprises: digital to analog converter and the 3rd low pass filter;
Digital to analog converter, the digital-to-analogue conversion that is used to realize sending signal, and the signal after will changing is exported to the 3rd low pass filter;
The 3rd low pass filter is used for the signal of digital to analog converter output is carried out LPF, the filtering out-of-band noise, and filtered signal exported to variable gain amplifier.
4. automatic amplitude control loop according to claim 3; It is characterized in that; Also comprise: the convergent-divergent circuit, be connected between power amplifier and the automatic amplitude control circuit, be used for being input to automatic amplitude control circuit behind the voltage signal of power amplifier output and the current signal convergent-divergent.
5. automatic amplitude control loop according to claim 4 is characterized in that, comprises in the said convergent-divergent circuit: transformer circuit, first electric capacity, second electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance and Voltage Reference;
The output of power amplifier is through transformer circuit and the 4th grounding through resistance;
The output of power amplifier is connected with the voltage channel analog to digital converter of automatic amplitude control circuit with first resistance through first electric capacity;
Voltage Reference is connected with the voltage channel analog to digital converter of automatic amplitude control circuit through second resistance;
The non-earth terminal of the 4th resistance is connected with the current channel analog to digital converter of automatic amplitude control circuit through second electric capacity;
Voltage Reference is connected with the current channel analog to digital converter of automatic amplitude control circuit through the 3rd resistance.
6. automatic amplitude control loop according to claim 5 is characterized in that said power amplifier is the AB power-like amplifier.
7. automatic amplitude control loop according to claim 6 is characterized in that, this automatic amplitude control loop is applied in the power-line carrier communication system.
8. the control method of an automatic amplitude control loop is characterized in that, may further comprise the steps:
Automatic amplitude control circuit compares the power output of power amplifier with preset target power, and gives variable gain amplifier according to comparative result output control corresponding sign indicating number;
Variable gain amplifier is adjusted the amplitude of sending signal according to said control code, and adjusted signal is sent to power amplifier.
9. the control method of automatic amplitude control loop according to claim 8; It is characterized in that; Compare with preset target power in the power output of said automatic amplitude control circuit power amplifier; And export the control corresponding sign indicating number according to comparative result and give in the step of variable gain amplifier, comprise following substep:
Comparator compares the power output of power amplifier with preset target power,
If the power output of power amplifier is greater than first thresholding, then the output valve of integrator subtracts 1;
If the power output of power amplifier is less than second thresholding, then the output valve of integrator adds 1;
If the power output of power amplifier is between first thresholding and second thresholding, then the output valve of integrator remains unchanged.
10. the control method of automatic amplitude control loop according to claim 9; It is characterized in that; Compare with preset target power in the power output of said automatic amplitude control circuit power amplifier; And give before the step of variable gain amplifier according to comparative result output control corresponding sign indicating number, further comprising the steps of:
Convert the current signal and the voltage signal of power amplifier output to digital signal;
Current signal that converts digital signal to and voltage signal are carried out LPF;
Voltage signal behind the LPF and current signal are multiplied each other, obtain the power output of power amplifier;
The power output of power amplifier is carried out LPF.
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| CN201210199741.8A CN102723922B (en) | 2012-06-15 | 2012-06-15 | Automatic amplitude control loop and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103236874A (en) * | 2013-05-14 | 2013-08-07 | 北京华强智连微电子有限责任公司 | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication |
| CN103368556A (en) * | 2012-03-26 | 2013-10-23 | 拉碧斯半导体株式会社 | Data receiving circuit and data receiving method |
| CN103888170A (en) * | 2012-12-21 | 2014-06-25 | 光宝科技股份有限公司 | Power line communication device, power line communication system and power monitoring method thereof |
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| CN1667945A (en) * | 2005-04-01 | 2005-09-14 | 深圳市惠天通信技术有限公司 | Linear audio power amplifying system with predistortion |
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| CN102723922B (en) | 2015-01-21 |
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