CN113114055B - Self-adaptive AC-DC conversion device and method for wireless transmission of sound carrier - Google Patents
Self-adaptive AC-DC conversion device and method for wireless transmission of sound carrier Download PDFInfo
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- CN113114055B CN113114055B CN202110244034.5A CN202110244034A CN113114055B CN 113114055 B CN113114055 B CN 113114055B CN 202110244034 A CN202110244034 A CN 202110244034A CN 113114055 B CN113114055 B CN 113114055B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/15—Circuit arrangements or systems for wireless supply or distribution of electric power using ultrasonic waves
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Abstract
本发明公开了一种用于声载波无线传输的自适应AC‑DC转换装置及方法，所述装置包括：电压电流监测模块、自适应控制器和可调AC‑DC转换模块；所述电压电流监测模块用于实时监测并获取可调AC‑DC转换模块的输入电压、输入电流、输出电压和输出电流信号，并将信号实时输入到自适应控制器；所述自适应控制器用于实时接收电压电流监测模块输出的信号，使用最优化算法计算可调AC‑DC转化电路中可调元器件的参数值并输入可调AC‑DC电路；最终使可调AC‑DC转换模块以及负载设备的阻抗和声载波无线传输系统的前置部分的阻抗匹配；所述可调AC‑DC转换模块，用于接收声载波无线传输系统的前置部分输出的电压和自适应控制器输出的可调元器件的参数值，调整电路中的可调元器件的参数。
The invention discloses an adaptive AC-DC conversion device and method for wireless transmission of acoustic carriers. The device comprises: a voltage and current monitoring module, an adaptive controller and an adjustable AC-DC conversion module; the voltage and current The monitoring module is used for real-time monitoring and acquisition of the input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module, and the signals are input to the adaptive controller in real time; the adaptive controller is used for receiving the voltage in real time The signal output by the current monitoring module uses an optimization algorithm to calculate the parameter values of the adjustable components in the adjustable AC-DC conversion circuit and input it into the adjustable AC-DC circuit; finally, the impedance of the adjustable AC-DC conversion module and the load device is adjusted. impedance matching with the front part of the sound carrier wireless transmission system; the adjustable AC-DC conversion module is used to receive the voltage output from the front part of the sound carrier wireless transmission system and the adjustable components output by the adaptive controller , adjust the parameters of the adjustable components in the circuit.
Description
Technical Field
The invention belongs to the field of sound carrier wireless transmission, and particularly relates to a self-adaptive AC-DC conversion device and a self-adaptive AC-DC conversion method for sound carrier wireless transmission.
Background
Along with the development of science and technology, instrument and equipment obtains the wide use in each field, and spatial distribution's width is also bigger and bigger, is difficult to satisfy all application scenarios to the scheme of instrument and equipment carrying out wired power supply energy supply. Wireless power supply and energy supply technologies are therefore gaining attention, and most commonly wireless energy transmission technologies based on electromagnetic coupling. However, the wireless energy transmission by applying the technology is influenced by the electromagnetic shielding effect, and cannot be applied to wireless energy transmission under the scenes of underwater, inside and outside a closed metal box body and the like. Therefore, wireless transmission schemes of acoustic carriers without being affected by electromagnetic shielding have been studied.
Because most load equipment including various acoustic transducers need direct current power supply, an AC-DC module needs to be added in the acoustic carrier wireless transmission system for alternating current-direct current conversion, otherwise, the acoustic carrier wireless transmission system is difficult to be practically applied.
The wireless transmission of the acoustic carrier has the particularity of radio frequency transmission, the required AC-DC conversion is the conversion of high-frequency alternating current to direct current, and the impedance matching problem must be considered. In radio frequency transmission lines, impedance mismatches produce signal reflections, resulting in signal distortion and reduced power transfer efficiency.
The existing AC-DC circuit can solve the problem of static impedance matching of sound carrier wireless transmission. However, in practical applications, impedance characteristics of load devices to be driven and required power supply conditions are different, and the AC-DC circuit using static impedance matching results in poor adaptability of the wireless acoustic carrier transmission system, and cannot maintain efficient power supply for different loads. The adaptability is poor, the debugging is complicated, the power supply efficiency is unstable, and the sound carrier wireless transmission system is difficult to be commercialized.
In summary, there is a need for an AC-DC converter that can adapt to different load devices and ensure the high efficiency and stability of wireless transmission of an acoustic carrier.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a self-adaptive AC-DC conversion device and a self-adaptive AC-DC conversion method which can be self-adaptive to different load equipment and have high energy conversion efficiency and are applied to sound carrier wireless transmission.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the voltage and current monitoring module is used for monitoring and acquiring input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module in real time and inputting the signals to the self-adaptive controller in real time;
the self-adaptive controller is used for receiving the signals output by the voltage and current monitoring module in real time, calculating the parameter values of adjustable components in the adjustable AC-DC conversion circuit by using an optimization algorithm, and inputting the parameter values of the adjustable components into the adjustable AC-DC circuit; finally, matching the impedance of the adjustable AC-DC conversion module and the load equipment with the impedance of the front part of the sound carrier wireless transmission system;
the adjustable AC-DC conversion module is used for receiving the voltage output by the front part of the sound carrier wireless transmission system and the parameter value of the adjustable component output by the self-adaptive controller, and adjusting the parameter of the adjustable component in the circuit.
As an improvement of the above apparatus, the adjustable AC-DC conversion module includes two circuit input terminals, an adjustable component, a switch network, a motor, and two output terminals, and the adjustable component includes: four groups of adjustable capacitors with the same size and an adjustable inductor;
one circuit input end for connecting the preposed part of the sound carrier wireless transmission system, and the other circuit input end for receiving the capacitance parameter value and the inductance value output by the self-adaptive controller;
the switch network is used for simultaneously adjusting four groups of adjustable capacitors according to the capacitance parameter value input by the self-adaptive controller;
the motor is used for adjusting the adjustable inductor according to the inductance parameter value input by the self-adaptive controller;
one circuit output terminal is used for outputting voltage to the load equipment, and the other circuit output terminal is used for outputting signals of input voltage, input current, output voltage and output current of the adjustable AC-DC conversion module to the voltage and current monitoring module.
As an improvement of the above apparatus, the adaptive controller includes: the device comprises an input unit, an adjustable capacitance adjusting unit, an adjustable inductance adjusting unit, a judging unit and an output unit;
the input unit is used for receiving the signals output by the voltage and current monitoring module in real time, and comprises: input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module;
the adjustable capacitance adjusting unit is used for adjusting the adjustable capacitance value by using a gradient descent algorithm, and after the adjustment is finished, the adjustable inductance adjusting unit is started;
the adjustable inductance adjusting unit is used for keeping the adjustable capacitance value after adjustment unchanged, receiving the signal output by the voltage and current monitoring module in real time, and adjusting the adjustable inductance value by using a gradient descent algorithm; after the adjustment is finished, starting a judging unit;
the judging unit is used for preprocessing the signals received in real time and extracting amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, keeping the adjustable inductance value unchanged, and starting the adjustable capacitance adjusting unit;
and the output unit is used for outputting the adjustable capacitance value or the adjustable inductance value which is adjusted each time to the adjustable AC-DC conversion module.
step 1) setting an initial value of an adjustable component in the adjustable AC-DC conversion module, and operating an acoustic carrier wireless transmission system;
step 2), the adaptive controller adjusts the adjustable capacitance value by using a gradient descent algorithm, and the step 3) is carried out after the adjustment is finished;
step 3), the adaptive controller keeps the adjustable capacitance value unchanged, the gradient descent algorithm is used for adjusting the adjustable inductance value, and after the adjustment is finished, the step 4) is carried out;
step 4), the self-adaptive controller preprocesses the signals received in real time and extracts amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, the adaptive controller keeps the adjustable inductance value unchanged, and the step 2) is carried out.
As an improvement of the above method, the initial value of the adjustable component is determined according to the acoustic carrier frequency, the nominal power rating of the load device and the estimated output voltage of the AC-DC conversion circuit.
As an improvement of the above method, the step 2) specifically includes:
step 2-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 2-2), and the subsequent disturbance enters step 2-3);
step 2-2) determining disturbance quantity delta of primary disturbance1(T1) The value range is as follows:
Value1,0×5％≥Δ1(T1)≥ΔT1,min
wherein, T1Value being the current number of adjustments of the adjustable capacitance1,0The value of the adjustable capacitance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T1,minThe minimum adjustment quantity of the adjustable capacitor in physics is obtained;
the disturbance direction of the initial disturbance is defined as the direction in which the adjustable capacitance Value becomes larger, so the adjustable capacitance Value after the initial disturbance1(T1) Expressed as:
Value1(T1)＝Value1,0+Δ1(T1)
entering step 2-4) after the calculation is finished;
step 2-3) determining the disturbance quantity delta of the subsequent disturbance1(T1)，Δ1(T1) The value range is as follows:
δ1(T1-1)≥Δ1(T1)≥ΔT1,min
wherein, delta1(T1-1) is the absolute value of the last gradient adjustment;
calculating actual input impedance based on the amplitude and phase information of the input current and the input voltage of the preprocessed adaptive controller; radio transmission system using actual input impedance and characteristic impedance Z of sound carriercComparing to obtain a matching error value e1(T1) The disturbance direction of the disturbance quantity of the subsequent disturbance is based on the current matching error value e1(T1) Error value e of last matching1(T1-1) is determined by the sign of the difference, expressed as sign (e)1(T1)-e1(T1-1)) e { -1,1}, then the Value of the adjustable component after subsequent perturbation1(T) is represented by:
Value1(T1)＝Value1(T1-1)-Δ1(T1)×sign(e1(T1)-e1(T1-1))
entering step 2-4) after the calculation is finished;
step 2-4), inputting the disturbed adjustable capacitance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation to be stable;
step 2-5) calculating the current matching error value e1(T1) And according to the last matching error value e1(T1-1) absolute value delta from last gradient adjustment1(T1-1) calculating the gradient g1(T1) According to the gradient g1(T1) And step set in advance1,lenGenerating a primary gradient adjustment delta1(T1)：
δ1(T1)＝-g1(T1)×step1,len
The gradient adjusted adjustable capacitance value C (T)1) Comprises the following steps:
C(T1)＝C(T1-1)+δ1(T1)
step 2-6) adjusting the adjustable capacitance value C (T) after gradient adjustment1) The input adjustable AC-DC conversion module is adjusted and waits for the operation stability of the input adjustable AC-DC conversion module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable capacitance is adjusted, marking is carried out, and T1Resetting, and entering step 3); otherwise, T1After adding 1, the process goes to step 2-3).
As an improvement of the above method, the step 3) specifically includes:
step 3-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 3-2), and the subsequent disturbance enters step 3-3);
step 3-2) determining disturbance quantity delta of primary disturbance2(T2) The value range is as follows:
Value2,0×5％≥Δ2(T2)≥ΔT2,min
wherein, T2Value being the current number of adjustments of the adjustable inductance2,0The value of the adjustable inductance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T2,minThe minimum adjustment quantity of the adjustable inductance is physically; the value of the adjustable capacitor is the value after the adjustment in the step 2) is finished;
the disturbance direction of the initial disturbance is defined as the direction that the adjustable inductance Value becomes larger, so the adjustable inductance Value after the initial disturbance2(T2) Expressed as:
Value2(T2)＝Value2,0+Δ2(T2)
entering step 3-4) after the calculation is finished;
step 3-3) determining the disturbance quantity delta of the subsequent disturbance2(T2)，Δ2(T2) The value range is as follows:
δ2(T2-1)≥Δ2(T2)≥ΔT2,min
wherein, delta2(T2-1) is the absolute value of the last gradient adjustment;
calculating actual input impedance based on the amplitude and phase information of the input current and the input voltage of the preprocessed adaptive controller; radio transmission system using actual input impedance and characteristic impedance Z of sound carriercComparing to obtain a matching error value e2(T2) The disturbance direction of the disturbance quantity of the subsequent disturbance is based on the current matching error value e2(T2) Error value e of last matching2(T2-1) is determined by the sign of the difference, expressed as sign (e)2(T2)-e2(T2-1)), { -1,1}, then the post-perturbation tunabilityValue of inductance2(T) is represented by:
Value2(T)＝Value2(T-1)-Δ2(T)×sign(e2(T)-e2(T-1))
entering step 3-4) after the calculation is finished;
step 3-4) inputting the disturbed adjustable inductance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation stability;
step 3-5) calculating the current matching error value e2(T2) And according to the last matching error value e2(T2-1) absolute value delta from last gradient adjustment2(T2-1) calculating the gradient g2(T2) According to the gradient g2(T2) And step set in advance2,lenGenerating a primary gradient adjustment delta2(T2)：
δ2(T2)＝-g2(T2)×step2,len
The adjustable inductance value L (T) after gradient adjustment2) Comprises the following steps:
L(T2)＝L(T2-1)+δ2(T2)
step 3-6) adjusting the adjustable inductance value L (T) after gradient adjustment2) The input adjustable AC-DC conversion module is adjusted and waits for the operation stability of the input adjustable AC-DC conversion module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable inductance is adjusted, marking is carried out, and T2Resetting, entering step 4), otherwise, T2After adding 1, go to step 3-3).
As an improvement of the above method, the step 4) specifically includes:
step 4-1), the self-adaptive controller preprocesses signals received in real time, extracts amplitude and phase information of input current and input voltage, and calculates actual input impedance;
step 4-2) the actual input impedance and the characteristic impedance Z of the sound carrier wireless transmission systemcComparing to obtain an overall matching error value e;
step 4-3) comparing the total matching error value e smaller than the convergence threshold epsilon, so as to reach the optimal load equipment driving condition, and finishing the adjustment; otherwise, turning to the step 4-4);
and 4-4) keeping the adjustable inductance value unchanged by the adaptive controller, and entering the step 2).
The invention has the advantages that:
1. the device and the method can monitor in real time and control and adjust the AC-DC conversion circuit by using a self-adaptive algorithm, and can quickly adjust to reach impedance matching conditions aiming at different load equipment, so that the power supply of the sound carrier wireless transmission system is more stable and efficient, and the practical application of sound carrier wireless transmission is facilitated to fall on the ground;
2. the device and the method can automatically adapt to the replacement and the change of the load equipment of the sound carrier wireless transmission system, and further improve the stability and the efficiency of power supply. The high-efficiency stable operation of the sound carrier wireless transmission system is realized.
Drawings
Fig. 1 is a connection block diagram of an adaptive AC-DC conversion apparatus for wireless transmission of an acoustic carrier according to the present invention;
FIG. 2 is a block diagram of the adjustable AC-DC conversion module of the present invention;
fig. 3 is a general flowchart of the adaptive AC-DC conversion method for wireless transmission of an acoustic carrier according to the present invention;
FIG. 4 is a sub-flow diagram of the adjustable capacitance adjustment process operating in an adaptive controller in accordance with the present invention;
fig. 5 is a sub-flow diagram of the adjustable inductance adjustment process of the present invention operating in an adaptive controller.
The attached drawings are as follows:
1. voltage and current monitoring module 2 and self-adaptive controller
3. Adjustable AC-DC conversion module 4, sound carrier wireless transmission preposition device 5 and replaceable load equipment
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
as shown in fig. 1, embodiment 1 of the present invention provides an adaptive AC-DC conversion apparatus for wireless transmission of an acoustic carrier, including: the voltage and current monitoring module 1 is used for monitoring voltage and current; the self-adaptive controller 2 is connected with the voltage and current monitoring module 1 and the adjustable AC-DC conversion module 3, and calculates adjustable element parameters by using a self-adaptive algorithm; the adjustable AC-DC conversion module 3 is connected with the voltage and current monitoring module 1, the adaptive controller 2, the sound carrier wireless transmission preposition device 4 and the replaceable load equipment 5, and has the functions of AC-DC conversion and impedance matching; the acoustic carrier wireless transmission preposition device 4 is connected with the input end of the adjustable AC-DC conversion module 3 and is a necessary hardware part for acoustic carrier wireless transmission; and the replaceable load device 5 is connected with the output end of the adjustable AC-DC conversion module 3 and is the target of the final drive of the sound carrier wireless transmission. The voltage and current monitoring module 1, the adaptive controller 2 and the adjustable AC-DC conversion module 3 together complete adaptive adjustment.
The adaptive controller 2 is a main execution module of the adaptive algorithm and can be divided into five parts: the device comprises an input unit, an adjustable capacitance adjusting unit, an adjustable inductance adjusting unit, a judging unit and an output unit;
the input unit is used for receiving the signals output by the voltage and current monitoring module in real time and comprises: input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module;
the adjustable capacitance adjusting unit is used for adjusting the adjustable capacitance value by using a gradient descent algorithm, and after the adjustment is finished, the adjustable inductance adjusting unit is started;
the adjustable inductance adjusting unit is used for keeping the adjustable capacitance value after adjustment unchanged, receiving the signal output by the voltage and current monitoring module in real time and adjusting the adjustable inductance value by using a gradient descent algorithm; after the adjustment is finished, starting a judging unit;
the judging unit is used for preprocessing the signals received in real time and extracting amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, keeping the adjustable inductance value unchanged, and starting the adjustable capacitance adjusting unit;
and the output unit is used for outputting the adjustable capacitance value or the adjustable inductance value which is adjusted each time to the adjustable AC-DC conversion module.
The acoustic carrier wireless transmission preposition device 4 comprises a radio frequency power supply based on acoustic carrier wireless transmission, a radio frequency power amplifier, a transmitting end and receiving end matching circuit and an acoustic carrier wireless transmission physical channel; the physical channel consists of two piezoelectric transducers and a middle metal barrier, wherein the piezoelectric transducers are symmetrically arranged and adopt PZT piezoelectric ceramic series, the resonance frequency is ensured to be consistent and fs(ii) a The output of which is connected to the input of the adjustable AC-DC conversion module 3.
As shown in fig. 2, the adjustable AC-DC conversion module 3 includes four adjustable capacitors with the same size, an adjustable inductor, four diodes and a filter capacitor, ACin1 and ACin2 are module input terminals, and DCout1 and DCout2 are module output terminals; the control part comprises an inductance L input and a capacitance C input, the adjustable inductor is controlled by the motor, the adjustable capacitor controls the size of the capacitor connected into the circuit by the switch, and the input impedance is adjusted by LC resonance.
As shown in fig. 3, based on the adaptive AC-DC conversion apparatus for wireless transmission of sound carrier in embodiment 1, embodiment 2 of the present invention provides an adaptive AC-DC conversion method for wireless transmission of sound carrier, and the overall flow includes:
step 1) setting an initial value of an adjustable component in the adjustable AC-DC conversion module, and operating an acoustic carrier wireless transmission system;
step 2), the adaptive controller adjusts the adjustable capacitance value by using a gradient descent algorithm, and the step 3) is carried out after the adjustment is finished;
step 3), the adaptive controller keeps the adjustable capacitance value unchanged, the gradient descent algorithm is used for adjusting the adjustable inductance value, and after the adjustment is finished, the step 4) is carried out;
step 4), the self-adaptive controller preprocesses the signals received in real time and extracts amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, the adaptive controller keeps the adjustable inductance value unchanged, and the step 2) is carried out.
Further, the initial value of the adjustable component is determined according to the acoustic carrier frequency, the nominal rated power of the load equipment and the estimated output voltage of the AC-DC conversion circuit.
Further, the main body part of step 2), step 3), and step 4) is respectively completed by the adjustable capacitance adjusting unit, the adjustable inductance adjusting unit, and the determining unit of the adaptive controller in fig. 1.
Fig. 4 specifically describes step 2 in fig. 3). As shown in fig. 4, the process of adjusting the adjustable capacitance value by the adaptive controller using the gradient descent algorithm specifically includes:
step 2-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 2-2), and the subsequent disturbance enters step 2-3);
step 2-2) determining disturbance quantity delta of primary disturbance1(T1) The value range is as follows:
Value1,0×5％≥Δ1(T1)≥ΔT1,min
wherein, T1Value being the current number of adjustments of the adjustable capacitance1,0The value of the adjustable capacitance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T1,minThe minimum adjustment quantity of the adjustable capacitor in physics is obtained;
the disturbance direction of the initial disturbance is defined as the direction in which the adjustable capacitance Value becomes larger, so the adjustable capacitance Value after the initial disturbance1(T1) Expressed as:
Value1(T1)＝Value1,0+Δ1(T1)
entering step 2-4) after the calculation is finished;
step 2-3) determining the disturbance quantity delta of the subsequent disturbance1(T1)，Δ1(T1) The value range is as follows:
δ1(T1-1)≥Δ1(T1)≥ΔT1,min
wherein，δ1(T1-1) is the absolute value of the last gradient adjustment;
input current I of adaptive controller based on preprocessinginAnd an input voltage UinCalculates the actual input impedance Z from the amplitude and phase information ofin(ii) a Using the actual input impedance ZinCharacteristic impedance Z of wireless transmission system with sound carriercComparing to obtain a matching error value e1(T1) The disturbance direction of the disturbance quantity of the subsequent disturbance is based on the current matching error value e1(T1) Error value e of last matching1(T1-1) is determined by the sign of the difference, expressed as sign (e)1(T1)-e1(T1-1)) e { -1,1}, then the Value of the adjustable component after subsequent perturbation1(T) is represented by:
Value1(T1)＝Value1(T1-1)-Δ1(T1)×sign(e1(T1)-e1(T1-1))
entering step 2-4) after the calculation is finished;
step 2-4), inputting the disturbed adjustable capacitance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation to be stable;
step 2-5) calculating the current matching error value e1(T1) And according to the last matching error value e1(T1-1) absolute value delta from last gradient adjustment1(T1-1) calculating the gradient g1(T1) According to the gradient g1(T1) And step set in advance1,lenGenerating a primary gradient adjustment delta1(T1)：
δ1(T1)＝-g1(T1)×step1,len
The gradient adjusted adjustable capacitance value C (T)1) Comprises the following steps:
C(T1)＝C(T1-1)+δ1(T1)
step 2-6) adjusting the adjustable capacitance value C (T) after gradient adjustment1) Input adjustable AC-DC converterThe module is adjusted and waits for the stable operation of the module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable capacitance is adjusted, marking is carried out, and T1Resetting, and entering step 3); otherwise, T1After adding 1, the process goes to step 2-3).
Fig. 5 specifically describes step 3 in fig. 3). As shown in fig. 5, the process of adjusting the adjustable inductance value by the adaptive controller using the gradient descent algorithm specifically includes:
step 3-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 3-2), and the subsequent disturbance enters step 3-3);
step 3-2) determining disturbance quantity delta of primary disturbance2(T2) The value range is as follows:
Value2,0×5％≥Δ2(T2)≥ΔT2,min
wherein, T2Value being the current number of adjustments of the adjustable inductance2,0The value of the adjustable inductance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T2,minThe minimum adjustment quantity of the adjustable inductance is physically; the value of the adjustable capacitor is the value after the adjustment in the step 2) is finished;
the disturbance direction of the initial disturbance is defined as the direction that the adjustable inductance Value becomes larger, so the adjustable inductance Value after the initial disturbance2(T2) Expressed as:
Value2(T2)＝Value2,0+Δ2(T2)
entering step 3-4) after the calculation is finished;
step 3-3) determining the disturbance quantity delta of the subsequent disturbance2(T2)，Δ2(T2) The value range is as follows:
δ2(T2-1)≥Δ2(T2)≥ΔT2,min
wherein, delta2(T2-1) is the absolute value of the last gradient adjustment;
input current I of adaptive controller based on preprocessinginAnd an input voltage UinCalculates the actual input impedance Z from the amplitude and phase information ofin(ii) a Using the actual input impedance ZinCharacteristic impedance Z of wireless transmission system with sound carriercComparing to obtain a matching error value e2(T2) The disturbance direction of the disturbance quantity of the subsequent disturbance is based on the current matching error value e2(T2) Error value e of last matching2(T2-1) is determined by the sign of the difference, expressed as sign (e)2(T2)-e2(T2-1)), { -1,1}, and then the adjustable inductance Value after subsequent perturbation2(T) is represented by:
Value2(T)＝Value2(T-1)-Δ2(T)×sign(e2(T)-e2(T-1))
entering step 3-4) after the calculation is finished;
step 3-4) inputting the disturbed adjustable inductance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation stability;
step 3-5) calculating the current matching error value e2(T2) And according to the last matching error value e2(T2-1) absolute value delta from last gradient adjustment2(T2-1) calculating the gradient g2(T2) According to the gradient g2(T2) And step set in advance2,lenGenerating a primary gradient adjustment delta2(T2)：
δ2(T2)＝-g2(T2)×step2,len
The adjustable inductance value L (T) after gradient adjustment2) Comprises the following steps:
L(T2)＝L(T2-1)+δ2(T2)
step 3-6) adjusting the adjustable inductance value L (T) after gradient adjustment2) The input adjustable AC-DC conversion module is adjusted and waits for the operation stability of the input adjustable AC-DC conversion module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable inductance is adjustedIs marked, T2Resetting, entering step 4), otherwise, T2After adding 1, go to step 3-3).
Further, the actual input impedance Z is used in step 4)inCharacteristic impedance Z of wireless transmission system with sound carriercAnd comparing to obtain an overall matching error value e, comparing with a convergence threshold epsilon, and judging whether the optimal load equipment driving condition is reached. If e < epsilon, it is indicated that the optimal load device driving condition has been reached and the adjustment is ended.
The invention uses the self-adaptive algorithm to control and adjust the adjustable AC-DC conversion module, and can quickly adjust to reach the impedance matching condition aiming at different load devices, so that the power supply and the energy supply of the sound carrier wireless transmission system are more stable, the energy transmission efficiency is improved, and the practical application of the sound carrier wireless transmission is facilitated to fall on the ground. In addition, the device and the method of the invention can also be used together with other self-adaptive radio frequency power supplies and self-adaptive radio frequency power amplifiers.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. An adaptive AC-DC conversion method for sound carrier wireless transmission is realized based on an adaptive AC-DC conversion device for sound carrier wireless transmission,
the device comprises: the device comprises a voltage and current monitoring module, an adaptive controller and an adjustable AC-DC conversion module; the adjustable AC-DC conversion module is respectively connected with a front part of the sound carrier wireless transmission system and load equipment;
the voltage and current monitoring module is used for monitoring and acquiring input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module in real time and inputting the signals to the self-adaptive controller in real time;
the self-adaptive controller is used for receiving the signals output by the voltage and current monitoring module in real time, calculating the parameter values of adjustable components in the adjustable AC-DC conversion circuit by using an optimization algorithm, and inputting the parameter values of the adjustable components into the adjustable AC-DC circuit; finally, matching the impedance of the adjustable AC-DC conversion module and the load equipment with the impedance of the front part of the sound carrier wireless transmission system;
the adjustable AC-DC conversion module is used for receiving the voltage output by the front part of the sound carrier wireless transmission system and the parameter value of the adjustable component output by the self-adaptive controller, and adjusting the parameter of the adjustable component in the circuit;
the method comprises the following steps:
step 1) setting an initial value of an adjustable component in the adjustable AC-DC conversion module, and operating an acoustic carrier wireless transmission system;
step 2), the adaptive controller adjusts the adjustable capacitance value by using a gradient descent algorithm, and the step 3) is carried out after the adjustment is finished;
the step 2) specifically comprises the following steps:
step 2-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 2-2), and the subsequent disturbance enters step 2-3);
step 2-2) determining disturbance quantity delta of primary disturbance1(T1) The value range is as follows:
Value1,0×5％≥Δ1(T1)≥ΔT1,min
wherein, T1Value being the current number of adjustments of the adjustable capacitance1,0The value of the adjustable capacitance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T1,minThe minimum adjustment quantity of the adjustable capacitor in physics is obtained;
the disturbance direction of the initial disturbance is defined as the direction in which the adjustable capacitance Value becomes larger, so the adjustable capacitance Value after the initial disturbance1(T1) Expressed as:
Value1(T1)＝Value1,0+Δ1(T1)
entering step 2-4) after the calculation is finished;
step 2-3) determining the disturbance quantity delta of the subsequent disturbance1(T1)，Δ1(T1) The value range is as follows:
δ1(T1-1)≥Δ1(T1)≥ΔT1,min
wherein, delta1(T1-1) is the absolute value of the last gradient adjustment;
calculating actual input impedance based on the amplitude and phase information of the input current and the input voltage of the preprocessed adaptive controller; radio transmission system using actual input impedance and characteristic impedance Z of sound carriercComparing to obtain a matching error value e1(T1) The disturbance direction of the disturbance quantity of the subsequent disturbance is based on the current matching error value e1(T1) Error value e of last matching1(T1-1) is determined by the sign of the difference, expressed as sign (e)1(T1)-e1(T1-1)) e { -1,1}, then the Value of the adjustable component after subsequent perturbation1(T1) Expressed as:
Value1(T1)＝Value1(T1-1)-Δ1(T1)×sign(e1(T1)-e1(T1-1))
entering step 2-4) after the calculation is finished;
step 2-4), inputting the disturbed adjustable capacitance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation to be stable;
step 2-5) calculating the current matching error value e1(T1) And according to the last matching error value e1(T1-1) absolute value delta from last gradient adjustment1(T1-1) calculating the gradient g1(T1) According to the gradient g1(T1) And step set in advance1,lenGenerating a primary gradient adjustment delta1(T1)：
δ1(T1)＝-g1(T1)×step1,len
The gradient adjusted adjustable capacitance value C (T)1) Comprises the following steps:
C(T1)＝C(T1-1)+δ1(T1)
step 2-6) adjusting the adjustable capacitance value C (T) after gradient adjustment1) The input adjustable AC-DC conversion module is adjusted and waits for the operation stability of the input adjustable AC-DC conversion module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable capacitance is adjusted, marking is carried out, and T1Resetting, and entering step 3); otherwise, T1After adding 1, entering the step 2-3);
step 3), the adaptive controller keeps the adjustable capacitance value unchanged, the gradient descent algorithm is used for adjusting the adjustable inductance value, and after the adjustment is finished, the step 4) is carried out;
step 4), the self-adaptive controller preprocesses the signals received in real time and extracts amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, the adaptive controller keeps the adjustable inductance value unchanged, and the step 2) is carried out.
2. The adaptive AC-DC conversion method for wireless transmission of acoustic carriers according to claim 1, wherein the adjustable AC-DC conversion module comprises two circuit inputs, adjustable components, a switching network, a motor, and two outputs, the adjustable components comprising: four groups of adjustable capacitors with the same size and an adjustable inductor;
one circuit input end for connecting the preposed part of the sound carrier wireless transmission system, and the other circuit input end for receiving the capacitance parameter value and the inductance value output by the self-adaptive controller;
the switch network is used for simultaneously adjusting four groups of adjustable capacitors according to the capacitance parameter value input by the self-adaptive controller;
the motor is used for adjusting the adjustable inductor according to the inductance parameter value input by the self-adaptive controller;
one circuit output terminal is used for outputting voltage to the load equipment, and the other circuit output terminal is used for outputting signals of input voltage, input current, output voltage and output current of the adjustable AC-DC conversion module to the voltage and current monitoring module.
3. The adaptive AC-DC conversion method for wireless transmission of a sound carrier according to claim 2, wherein the adaptive controller comprises: the device comprises an input unit, an adjustable capacitance adjusting unit, an adjustable inductance adjusting unit, a judging unit and an output unit;
the input unit is used for receiving the signals output by the voltage and current monitoring module in real time, and comprises: input voltage, input current, output voltage and output current signals of the adjustable AC-DC conversion module;
the adjustable capacitance adjusting unit is used for adjusting the adjustable capacitance value by using a gradient descent algorithm, and after the adjustment is finished, the adjustable inductance adjusting unit is started;
the adjustable inductance adjusting unit is used for keeping the adjustable capacitance value after adjustment unchanged, receiving the signal output by the voltage and current monitoring module in real time, and adjusting the adjustable inductance value by using a gradient descent algorithm; after the adjustment is finished, starting a judging unit;
the judging unit is used for preprocessing the signals received in real time and extracting amplitude and phase information of input current and input voltage; judging whether the optimal load equipment driving condition is reached, and if so, finishing the adjustment; otherwise, keeping the adjustable inductance value unchanged, and starting the adjustable capacitance adjusting unit;
and the output unit is used for outputting the adjustable capacitance value or the adjustable inductance value which is adjusted each time to the adjustable AC-DC conversion module.
4. The adaptive AC-DC conversion method for wireless transmission of acoustic carriers according to claim 1, wherein the initial value of the adjustable component is determined according to the acoustic carrier frequency, the nominal power rating of the load device and the estimated output voltage of the AC-DC conversion circuit.
5. The adaptive AC-DC conversion method for wireless transmission of sound carrier according to claim 1, wherein the step 3) specifically comprises:
step 3-1) judging whether the disturbance is primary disturbance or subsequent disturbance, wherein the primary disturbance enters step 3-2), and the subsequent disturbance enters step 3-3);
step 3-2) determining disturbance quantity delta of primary disturbance2(T2) The value range is as follows:
Value2,0×5％≥Δ2(T2)≥ΔT2,min
wherein, T2Value being the current number of adjustments of the adjustable inductance2,0The value of the adjustable inductance value after the first adjustment is calculated by using an empirical formula numerical method based on the amplitude values of the input voltage, the input current and the output voltage of the preprocessed adaptive controller; delta T2,minThe minimum adjustment quantity of the adjustable inductance is physically; the value of the adjustable capacitor is the value after the adjustment in the step 2) is finished;
the disturbance direction of the initial disturbance is defined as the direction that the adjustable inductance Value becomes larger, so the adjustable inductance Value after the initial disturbance2(T2) Expressed as:
Value2(T2)＝Value2,0+Δ2(T2)
entering step 3-4) after the calculation is finished;
step 3-3) determining the disturbance quantity delta of the subsequent disturbance2(T2)，Δ2(T2) The value range is as follows:
δ2(T2-1)≥Δ2(T2)≥ΔT2,min
wherein, delta2(T2-1) is the absolute value of the last gradient adjustment;
calculating actual input impedance based on the amplitude and phase information of the input current and the input voltage of the preprocessed adaptive controller; radio transmission system using actual input impedance and characteristic impedance Z of sound carriercComparing to obtain a matching error value e2(T2) The disturbance direction of the disturbance amount of the subsequent disturbance is based onCurrent match error value e2(T2) Error value e of last matching2(T2-1) is determined by the sign of the difference, expressed as sign (e)2(T2)-e2(T2-1)), { -1,1}, and then the adjustable inductance Value after subsequent perturbation2(T2) Expressed as:
Value2(T2)＝Value2(T2-1)-Δ2(T2)×sign(e2(T2)-e2(T2-1))
entering step 3-4) after the calculation is finished;
step 3-4) inputting the disturbed adjustable inductance value into an adjustable AC-DC conversion module for adjustment and waiting for the operation stability;
step 3-5) calculating the current matching error value e2(T2) And according to the last matching error value e2(T2-1) absolute value delta from last gradient adjustment2(T2-1) calculating the gradient g2(T2) According to the gradient g2(T2) And step set in advance2,lenGenerating a primary gradient adjustment delta2(T2)：
δ2(T2)＝-g2(T2)×step2,len
The adjustable inductance value L (T) after gradient adjustment2) Comprises the following steps:
L(T2)＝L(T2-1)+δ2(T2)
step 3-6) adjusting the adjustable inductance value L (T) after gradient adjustment2) The input adjustable AC-DC conversion module is adjusted and waits for the operation stability of the input adjustable AC-DC conversion module, and whether the absolute value of the gradient value is smaller than a threshold value epsilon or not is judgedgIf yes, the adjustable inductance is adjusted, marking is carried out, and T2Resetting, entering step 4), otherwise, T2After adding 1, go to step 3-3).
6. The adaptive AC-DC conversion method for wireless transmission of sound carrier according to claim 1, wherein the step 4) specifically comprises:
step 4-1), the self-adaptive controller preprocesses signals received in real time, extracts amplitude and phase information of input current and input voltage, and calculates actual input impedance;
step 4-2) the actual input impedance and the characteristic impedance Z of the sound carrier wireless transmission systemcComparing to obtain an overall matching error value e;
step 4-3) comparing the total matching error value e smaller than the convergence threshold epsilon, so as to reach the optimal load equipment driving condition, and finishing the adjustment; otherwise, turning to the step 4-4);
and 4-4) keeping the adjustable inductance value unchanged by the adaptive controller, and entering the step 2).
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