CN117452073A - Load impedance detection method and device - Google Patents
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Abstract
The application discloses a method and a device for detecting load impedance, which are applied to an MCU (micro control Unit) of a radio frequency circuit with a load, wherein the method comprises the following steps: acquiring the current of the load and the voltage of the load; obtaining target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter; obtaining a target current product according to the current of the load, the third multiplier and the second filter; and obtaining the impedance of the load according to the target reactive power, the target current product and a divider. The impedance of the load can be obtained by carrying out multiple times of processing on the voltage and the current of the load, so that the impedance of the load in the radio frequency circuit can be detected in real time, and the impedance matching requirement of the circuit is met.
Description
Technical Field
The present disclosure relates to the field of radio frequency circuits and impedance detection, and in particular, to a method and apparatus for detecting load impedance.
Background
The radio frequency circuit is a circuit with the electromagnetic wavelength of the processing signal in the same order of magnitude with the size of a circuit or a device, and is mainly applied to the field of wireless communication.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting load impedance, which are used for detecting the impedance of a load in a radio frequency circuit in real time and meeting the impedance matching requirement of the circuit.
In a first aspect, an embodiment of the present application provides a method for detecting load impedance, applied to an MCU having a radio frequency circuit of a load, the method including:
acquiring the current of the load and the voltage of the load; obtaining target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter; obtaining a target current product according to the current of the load, the third multiplier and the second filter; and obtaining the impedance of the load according to the target reactive power, the target current product and a divider.
With reference to the first aspect, in one possible implementation manner, the acquiring the current of the load and the voltage of the load includes: acquiring the current of the load according to a current sensor; and acquiring the voltage of the load according to a voltage sensor.
With reference to the first aspect, in one possible implementation manner, the voltage sensor is connected to a first end of a first resistor, a second end of the first resistor is connected to a first capacitor, the current sensor is connected to a first end of a second capacitor, a second end of the second capacitor is connected to a second resistor, a first input end of the first multiplier is connected to the voltage sensor through the first resistor, and a second input end of the first multiplier is connected to the current sensor through the second capacitor.
With reference to the first aspect, in one possible implementation manner, the obtaining the target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter includes: acquiring capacitance voltage of a first input end of the first multiplier and resistance current of a second input end, wherein the capacitance voltage is the partial voltage of the load on the first capacitor, and the resistance current is the shunt of the current of the load on the second resistor; obtaining a first product of the resistance current and the capacitance voltage according to the first multiplier; obtaining a target adjustment factor according to the capacitor voltage and the resistor current; obtaining a second product of the first product and the target adjustment factor according to the second multiplier; and filtering the second product according to the first filter to obtain the target reactive power.
With reference to the first aspect, in a possible implementation manner, the obtaining the target adjustment factor according to the capacitor voltage and the resistor current includes: obtaining a first adjustment factor according to the ratio of the capacitor voltage to the voltage of the load; obtaining a second regulating factor according to the ratio of the resistance current to the current of the load; and obtaining the target regulating factor according to a third multiplication product of the first regulating factor and the second regulating factor, wherein the target regulating factor is an absolute value of the reciprocal of the third multiplication product.
With reference to the first aspect, in one possible implementation manner, the obtaining, according to the current of the load, the target current product by the third multiplier and the second filter includes: obtaining a square of a current of the load according to the third multiplier; and filtering the square of the current of the load through the second filter to obtain a target current product.
With reference to the first aspect, in a possible implementation manner, the obtaining, according to the target reactive power, the target current product and a divider, an impedance of the load includes: and obtaining a quotient of the product of the target reactive power and the target current according to the divider, wherein the quotient is the impedance of the load.
In a second aspect, an embodiment of the present application provides a device for detecting load impedance, where the device includes:
the acquisition module is used for acquiring the current of the load and the voltage of the load;
the processing module is used for obtaining target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter; and obtaining a target current product according to the current of the load, the third multiplier and the second filter; and obtaining the impedance of the load according to the target reactive power, the target current product and a divider.
In a third aspect, an embodiment of the present application provides a detection apparatus for load impedance, including:
a memory, a processor and a detection program of a load impedance stored on the memory and executable on the processor, the processor performing part or all of the steps as described in any one of the methods of the first aspect when the detection program of the load impedance is executed.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a load impedance detection program comprising execution instructions for performing part or all of the steps as described in any of the methods of the first aspect.
Through implementation of the embodiment of the application, an MCU of a radio frequency circuit firstly acquires current and voltage of a load, and then obtains target reactive power according to the current and voltage of the load, a first multiplier, a second multiplier and a first filter; then obtaining a target current product according to the current of the load, the third multiplier and the second filter; and finally, obtaining the impedance of the load according to the target reactive power, the target current product and the divider. The impedance of the load can be obtained by carrying out multiple times of processing on the voltage and the current of the load, so that the impedance of the load in the radio frequency circuit can be detected in real time, and the impedance matching requirement of the circuit is met.
Drawings
In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.
Fig. 1 is a schematic circuit architecture diagram of a radio frequency circuit according to an embodiment of the present application;
fig. 2 is a flowchart of a method for detecting load impedance according to an embodiment of the present application;
fig. 3 is a schematic diagram of a hardware architecture of a radio frequency circuit according to an embodiment of the present application;
fig. 4 is a circuit architecture diagram for acquiring capacitance voltage according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a circuit for obtaining resistive current according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a load impedance detection device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a load impedance detection device according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
The terms first, second, third and the like in the description and in the claims and drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The radio frequency circuit is a circuit with the electromagnetic wavelength of the processing signal in the same order of magnitude with the size of a circuit or a device, and is mainly applied to the field of wireless communication.
In view of the above problems, an embodiment of the present application provides a method and an apparatus for detecting load impedance, which are applied to an MCU having a radio frequency circuit of a load, where the MCU of the radio frequency circuit first obtains a current of the load and a voltage of the load, and then obtains a target reactive power according to the current of the load, the voltage of the load, a first multiplier, a second multiplier and a first filter; then obtaining a target current product according to the current of the load, the third multiplier and the second filter; and finally, obtaining the impedance of the load according to the target reactive power, the target current product and the divider. The impedance of the load can be obtained by carrying out multiple times of processing on the voltage and the current of the load, so that the impedance of the load in the radio frequency circuit can be detected in real time, and the impedance matching requirement of the circuit is met.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a radio frequency circuit according to an embodiment of the present application, and as shown in fig. 1, the circuit diagram of the radio frequency circuit 100 includes a micro control unit (micro controller unit, MCU) 101, a load 102, a current sensor 103, a voltage sensor 104, a multiplier 105, a filter 106 and a divider 107.
The micro control unit 101 is also called a single chip microcomputer or a single chip microcomputer, and is a chip-level computer formed by properly reducing the frequency and the specification of a central processing unit, integrating a memory, a counter, a USB, an A/D conversion, a UART, PLC, DMA peripheral interface and an LCD driving circuit on a single chip, and is used for reading data information of the current sensor 103 and the voltage sensor 104 in real time, and controlling the multiplier 105, the filter 106 and the divider 107 to work according to the read data information; the load 102 is an electrical component with a resistance and reactance disposed in the radio frequency circuit; the current sensor 103 includes a shunt, an electromagnetic current transformer, an electronic current transformer, etc. for measuring a real-time current flowing through the load 102 and feeding back to the micro control unit 101; the voltage sensor comprises a voltage transformer, a Hall voltage sensor, an optical fiber voltage sensor and the like, and is used for measuring the real-time voltage at two ends of the load 102 and feeding back to the micro control unit 101; the multiplier 105 multiplies signals of two input terminals and outputs a result, the filter filters the input signals according to a filtering rule set by the micro control unit 101 and outputs a result, and the divider divides the input signal of the first input terminal by the input signal of the second input terminal and outputs a result.
Based on this, the present application provides a method for detecting load impedance, referring to fig. 2, fig. 2 is a flowchart of a method for detecting load impedance provided in an embodiment of the present application, and as shown in fig. 2, the method for detecting load impedance includes:
s201, the MCU acquires the current of the load and the voltage of the load;
in one possible implementation, the MCU obtains the current of the load according to a current sensor; and acquiring the voltage of the load according to a voltage sensor.
The voltage sensor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the first capacitor, the current sensor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first end of the second resistor, the first input end of the first multiplier is connected with the voltage sensor through the first resistor, and the second input end of the first multiplier is connected with the current sensor through the second capacitor.
The first input end of the first multiplier is connected with the second end of the second capacitor, the second end of the first capacitor is grounded, and the second end of the second resistor is grounded.
It can be seen that in this example, the current sensor and the voltage sensor are used to obtain the real-time current and the real-time voltage of the load, which is beneficial to ensuring the accuracy of the measured current and voltage, and providing accurate data for the calculation of the impedance.
S202, the MCU obtains target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter;
in one possible implementation manner, the MCU obtains the target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter, including: acquiring capacitance voltage of a first input end of the first multiplier and resistance current of a second input end, wherein the capacitance voltage is the partial voltage of the load on the first capacitor, and the resistance current is the shunt of the current of the load on the second resistor; obtaining a first product of the resistance current and the capacitance voltage according to the first multiplier; obtaining a target adjustment factor according to the capacitor voltage and the resistor current; obtaining a second product of the first product and the target adjustment factor according to the second multiplier; and filtering the second product according to the first filter to obtain the target reactive power.
Referring to fig. 4, fig. 4 is a circuit structure diagram for obtaining a capacitor voltage, as shown in fig. 4, AC is an alternating voltage of a load, R1 is a first resistor, C1 is a first capacitor, GND1 is ground, U0 is a voltage of a first input end of a first multiplier, and at this time, the value of U0 is equal to two segments of voltages of C1, so at this time, U0 is equal to a voltage division of the load in the first capacitor.
Similarly, referring to fig. 5, fig. 5 is a circuit diagram for obtaining a resistive current according to an embodiment of the present application, as shown in fig. 5, AC is an alternating current of a load, C2 is a second capacitor, R2 is a second resistor, GND2 is ground, I0 is a current of a second input end of the first multiplier, and at this time, the value of I0 is equal to the current flowing through R2, so at this time, I0 is equal to the current of the load divided by the second resistor.
The current of the load obtained by the current sensor is I0, the voltage of the load obtained by the voltage sensor is U0, at this time, the input of the first input end and the input of the second input end of the first multiplier can be known according to the voltage division and the current division, specifically, the first input end of the first multiplier is connected with the voltage sensor through the first resistor, at this time, the voltage value of the first input end is equal to the voltage division of the voltage U0 of the load obtained by the voltage sensor at both ends of the first capacitor, that is, the capacitor voltage, the voltage division at both ends of the first capacitor is (ωc/(ωc+r)) U0, where C is the capacitance value of the first capacitor, R is the resistance value of the first resistor, ω is the frequency of the radio frequency circuit, and similarly, the second input end of the first multiplier is connected with the current sensor through the second capacitor, at this time, the current value of the second input end is equal to the current I0 of the load obtained by the current sensor flowing through the second resistor, that is the current component flowing through the second resistor is (R/(r+c)) I0, where C is the capacitance value of the second capacitor is the frequency of the radio frequency circuit.
It can be seen that in this example, the product of the capacitor voltage and the resistor current is obtained through the first multiplier, the product is adjusted through the second multiplier, and finally the independent ac component is removed after filtering to obtain the final reactive power, which is beneficial to ensuring the accuracy of the load reactive power obtained in real time.
In one possible implementation, the obtaining the target adjustment factor according to the capacitor voltage and the resistor current includes: obtaining a first adjustment factor according to the ratio of the capacitor voltage to the voltage of the load; obtaining a second regulating factor according to the ratio of the resistance current to the current of the load; and obtaining the target regulating factor according to a third multiplication product of the first regulating factor and the second regulating factor, wherein the target regulating factor is an absolute value of the reciprocal of the third multiplication product.
Wherein the first regulating factor k 1 For voltage division value, the second regulating factor k 2 For current split value, in particular, k 1 =ωC/(ωC+R)，k 2 R/(r+ωc), where C is the capacitance of the first capacitor or the second capacitor, R is the resistance of the first resistor or the second resistor, and ω is the frequency of the radio frequency circuit.
It can be seen that in this example, by obtaining the first adjustment factor and the second adjustment factor and obtaining the target adjustment factor according to the difference, the target adjustment factor may be invoked to process the product obtained by the first multiplier, thereby changing the phase angle of the product and reducing redundant information in the product.
S203, the MCU obtains a target current product according to the current of the load, the third multiplier and the second filter;
in one possible implementation manner, the obtaining the target current product according to the current of the load, the third multiplier and the second filter includes: obtaining a square of a current of the load according to the third multiplier; and filtering the square of the current of the load through the second filter to obtain a target current product.
Wherein the first end input and the second end input of the third multiplier are current values obtained by the current sensor, and the square of the current of the load is obtained by the output of the third multiplier, namely I 1 2 =½I 2 [cos2(ωt+θ)+1]Then the second filter filters the alternating current component in the square of the current of the load to obtain a target current product I 2 。
In this example, the square of the current of the load is obtained through the third multiplier, and then the second filter is used to filter the alternating current component in the square of the current of the load, so that the effective current can be obtained, the influence of alternating current shunt on subsequent impedance calculation is avoided, and the accuracy of load impedance detection is improved.
And S204, the MCU obtains the impedance of the load according to the target reactive power, the target current product and the divider.
In one possible implementation, the obtaining the impedance of the load according to the target reactive power, the target current product and the divider includes: and obtaining a quotient of the product of the target reactive power and the target current according to the divider, wherein the quotient is the impedance of the load.
Wherein, since q=i 2 X, in this case X is the impedance, so the divider takes reactive power as input at the first end and the target current product as input at the second endAnd dividing reactive power by a current effective value to obtain a stable impedance value X=Usinθ/I.
It can be seen that, in this example, according to the formula q=i 2 X, dividing reactive power Q by effective current value I by divider 2 The impedance X of the load is obtained, so that the accuracy of load impedance detection is ensured, and meanwhile, the difficulty of load impedance detection is reduced.
In one possible implementation manner, referring to fig. 3, fig. 3 is a schematic hardware architecture diagram of a radio frequency circuit provided in an embodiment of the present application, and as shown in fig. 3, a flow of detecting a load impedance of the radio frequency circuit is as follows:
the current sensor obtains a current value I 1 =icos (ωt+θ), the voltage sensor acquires the voltage value U 1 The reference symbol=ucos (ωt), ω is the frequency of the rf circuit at this time, I is the current flowing through the load at this time in the rf circuit, U is the voltage of the two load sections at this time in the rf circuit, t is the time of the rf circuit, and θ is the phase angle at this time in the rf circuit. At this time, the capacitor voltage U obtained at the first input end of the first multiplier i =k 1 Ucos(ωt+Φ 1 ) The resistance current I obtained from the second input end of the first multiplier i =k 2 Icos(ωt+θ-Φ 2 ) Wherein Φ is 1 Is the deflection angle of the capacitor voltage, phi 2 Is the deflection angle, k of the capacitance current 1 Is the voltage division value, k 2 Is a current shunt value; the MCU obtains a first product of the capacitor voltage and the resistor current as Q based on the first multiplier 1 =½k 1 ·k 2 UI[cos(2ωt+θ+Φ 1 +Φ 2 )+cos(Φ 1 -Φ 2 -θ)]The method comprises the steps of carrying out a first treatment on the surface of the Then the MCU obtains a second product Q2 based on the second multiplier, specifically, the first input end of the second multiplier is the first product Q 1 The second input is the target regulating factor |1/(k) 1 k 2 ) I, the second multiplier outputs a second product Q 2 =½UI[cos(2ωt+θ+Φ1+Φ2)+cos(-½π-θ]Finally, the second product is filtered by a first filter, and the first filter can filter the alternating current component in the second product, thereby obtaining the reflected power, namely the reactive power Q 3 =celain θ; at the same time, the third multiplicationThe input of the first input end and the second input end of the device is the current value I of the load obtained by the current sensor 1 The MCU obtains the square I of the current of the load based on a third multiplier 1 2 =½I 2 [cos2(ωt+θ)+1]Then the square of the current of the load is filtered through a second filter, and the alternating current component in the square is filtered to obtain a current effective value of I 2 I.e. the target current product, finally according to the formula q=i 2 X, wherein Q is reactive power, I 2 For the effective value of the current, X is the impedance of the load, and the MCU calculates Q/I through a divider 2 X, x=usinθ/I is obtained.
It can be seen that, in this example, the current of the load and the voltage of the load are processed by the cooperation of the multipliers, the filters and the dividers to obtain the impedance of the load, so that the impedance X of the load can be obtained in real time, and the value of the impedance matcher is adjusted according to the value of the impedance X, thereby meeting the impedance matching requirement of the circuit.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a device for detecting load impedance according to an embodiment of the present application, and as shown in fig. 6, a device 600 for detecting load impedance includes:
an acquisition module 601, configured to acquire a current of a load and a voltage of the load;
the processing module 602 is configured to obtain a target reactive power according to a current of a load, a voltage of the load, a first multiplier, a second multiplier, and a first filter; and obtaining a target current product according to the current of the load, the third multiplier and the second filter; and obtaining the impedance of the load according to the target reactive power, the target current product and the divider.
In one possible implementation, the acquiring module 601 is specifically configured to acquire a current of the load according to the current sensor; and the voltage sensor is used for acquiring the voltage of the load.
In one possible implementation manner, the acquiring module 601 is specifically configured to acquire a capacitance voltage of the first input terminal of the first multiplier and a resistance current of the second input terminal, where the capacitance voltage is a voltage division of the voltage of the load at the first capacitor, and the resistance current is a current division of the current of the load at the second resistor.
In one possible implementation, the processing module 602 is specifically configured to obtain a first product of the resistive current and the capacitive voltage according to the first multiplier; the target regulating factor is obtained according to the capacitor voltage and the resistor current; and obtaining a second product of the first product and the target adjustment factor according to the second multiplier; and the filter is used for filtering the second product according to the first filter to obtain the target reactive power.
In one possible implementation, the processing module 602 is specifically configured to obtain the first adjustment factor according to a ratio of the capacitor voltage to the voltage of the load; and obtaining a second adjustment factor according to the ratio of the resistance current to the current of the load; and obtaining a target adjustment factor according to a third multiplication product of the first adjustment factor and the second adjustment factor, wherein the target adjustment factor is an absolute value of an inverse of the third multiplication product.
In one possible implementation, the processing module 602 is specifically configured to obtain a square of a current of the load according to the third multiplier; and the second filter is used for filtering the square of the current of the load to obtain a target current product.
In one possible implementation, the processing module 602 is specifically configured to obtain, according to a divider, a quotient of the product of the target reactive power and the target current, where the quotient is an impedance of the load.
It should be noted that, for a specific functional implementation manner of the load impedance detection apparatus 600, reference is made to the description of the load impedance detection method shown in fig. 2, for example, the acquisition module 601 is configured to implement the relevant content of executing S201, and the processing module 602 is configured to implement the relevant content of executing S202-S204. The respective units or modules in the load impedance detecting apparatus 600 can be individually or collectively constituted as one or several additional units or modules, or some (some) of them can be further divided into a plurality of units or modules smaller in function, which can achieve the same operation without affecting the achievement of the technical effects of the embodiments of the present invention. The above units or modules are divided based on logic functions, and in practical applications, the functions of one unit (or module) are implemented by a plurality of units (or modules), or the functions of a plurality of units (or modules) are implemented by one unit (or module).
Referring to fig. 7, fig. 7 is a schematic structural diagram of a load impedance detection apparatus according to an embodiment of the present application, and as shown in fig. 7, a load impedance detection apparatus 700 includes:
the processor 701, the memory 702, the communication interface 703, the processor 701, the memory 702 and the communication interface 703 are connected to each other and perform communication work therebetween;
the memory 702 stores a load impedance detection program, and the communication interface 703 is used for wireless communication;
the processor 701 is configured to retrieve a load impedance detection program stored in the memory 702, and execute part or all of the steps of any one of the load impedance detection methods described in the above method embodiments, where the computer includes an electronic terminal device.
The processor 701 may include one or more processing cores. The processor 701 utilizes various interfaces and lines to connect various portions of the overall electronic device, perform various functions of the electronic device, and process data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 702, and invoking data stored in the memory 702. Alternatively, the processor 701 may be implemented in hardware in at least one of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (ProgrammableLogic Array, PLA). The processor 701 may integrate one or a combination of several of a central processing unit (CentralProcessing Unit, CPU), an image processor (Graphics Processing Unit, GPU), and a modem, etc. It will be appreciated that the modem may not be integrated into the processor 701 and may be implemented solely by a single communication chip.
The Memory 702 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (ROM). Memory 702 may be used to store instructions, programs, code, sets of codes, or instruction sets. The memory 702 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing examples of the respective methods described above, and the like. The storage data area may also store data created by the electronic device in use, etc.
It will be appreciated that the electronic device may include more or fewer structural elements than those described in the above structural block diagrams, including, for example, a power module, physical key, wiFi (Wireless Fidelity ) module, speaker, bluetooth module, sensor, etc., without limitation.
The present application provides a computer-readable storage medium storing a computer program for electronic data exchange, the computer program comprising execution instructions for performing part or all of the steps of any one of the load impedance detection methods described in the method examples above.
The present application also provides a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform part or all of the steps of any one of the load impedance detection methods described in the method examples above. The computer program product may be a software installation package.
It should be noted that, for simplicity of description, any of the foregoing examples of the method for detecting the load impedance are described as a series of combinations of actions, but those skilled in the art should appreciate that the present application is not limited by the order of actions described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art will also appreciate that the examples described in the specification are preferred examples and that the acts referred to are not necessarily required in the present application.
Although the present application has been described herein in connection with various examples, other variations to the disclosed examples can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of any of the load impedance detection methods examples described above may be performed by a program that instructs associated hardware, and that the program may be stored in a computer readable memory, which may include: flash disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
The foregoing has described the present application in detail, and specific examples have been provided herein to illustrate the principles and embodiments of a method and apparatus for detecting load impedance, the above examples being provided only to assist in understanding the method and core ideas of the present application; meanwhile, as for those skilled in the art, according to the idea of the method and apparatus for detecting load impedance of the present application, there are various changes in the specific embodiments and application ranges, and in summary, the present disclosure should not be construed as limiting the present application.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, hardware products, and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be appreciated that any product of the processing method of the flowcharts described in connection with the example method of detecting load impedance and configured to perform the method of detecting load impedance, such as the terminals of the flowcharts described above, and the computer program products, fall within the scope of the related products described herein.
It will be apparent to those skilled in the art that various modifications and variations can be made in the method and apparatus for detecting load impedance provided herein without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A method of detecting load impedance, applied to an MCU having a radio frequency circuit of a load, the method comprising:
acquiring the current of the load and the voltage of the load;
obtaining target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter;
obtaining a target current product according to the current of the load, the third multiplier and the second filter;
and obtaining the impedance of the load according to the target reactive power, the target current product and a divider.
2. The method of claim 1, wherein the obtaining the current of the load and the voltage of the load comprises:
acquiring the current of the load according to a current sensor;
and acquiring the voltage of the load according to a voltage sensor.
3. The method of claim 2, wherein the voltage sensor is connected to a first end of a first resistor, a second end of the first resistor is connected to a first capacitor, the current sensor is connected to a first end of a second resistor, a second end of the second resistor is connected to a second capacitor, a first input of the first multiplier is connected to the voltage sensor through the first resistor, and a second input of the first multiplier is connected to the current sensor through the second capacitor.
4. A method according to claim 3, wherein said deriving the target reactive power from the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter comprises:
acquiring capacitance voltage of a first input end of the first multiplier and resistance current of a second input end, wherein the capacitance voltage is the partial voltage of the load on the first capacitor, and the resistance current is the shunt of the current of the load on the second resistor;
obtaining a first product of the resistance current and the capacitance voltage according to the first multiplier;
obtaining a target adjustment factor according to the capacitor voltage and the resistor current;
obtaining a second product of the first product and the target adjustment factor according to the second multiplier;
and filtering the second product according to the first filter to obtain the target reactive power.
5. The method of claim 4, wherein said deriving a target adjustment factor from said capacitor voltage and said resistor current comprises:
obtaining a first adjustment factor according to the ratio of the capacitor voltage to the voltage of the load;
obtaining a second regulating factor according to the ratio of the resistance current to the current of the load;
and obtaining the target regulating factor according to a third multiplication product of the first regulating factor and the second regulating factor, wherein the target regulating factor is an absolute value of the reciprocal of the third multiplication product.
6. The method of any of claims 1-5, wherein the deriving a target current product from the current of the load, a third multiplier, and a second filter comprises:
obtaining a square of a current of the load according to the third multiplier;
and filtering the square of the current of the load through the second filter to obtain a target current product.
7. The method of any of claims 1-5, wherein the deriving the impedance of the load from the target reactive power, the target current product and a divider comprises:
and obtaining a quotient of the product of the target reactive power and the target current according to the divider, wherein the quotient is the impedance of the load.
8. A device for detecting load impedance, the device comprising:
the acquisition module is used for acquiring the current of the load and the voltage of the load;
the processing module is used for obtaining target reactive power according to the current of the load, the voltage of the load, the first multiplier, the second multiplier and the first filter; and obtaining a target current product according to the current of the load, the third multiplier and the second filter; and obtaining the impedance of the load according to the target reactive power, the target current product and a divider.
9. A load impedance detection apparatus, the apparatus comprising:
memory, a processor and a load impedance detection program stored on the memory and executable on the processor, the processor executing the steps of the load impedance detection method according to any one of claims 1-7 when executing the load impedance detection program.
10. A computer-readable storage medium, wherein a load impedance detection program is stored on the computer-readable storage medium, the load impedance detection program including execution instructions for performing the steps of the load impedance detection method according to any one of claims 1-7.
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| CN202311786695.6A CN117452073A (en) | 2023-12-25 | 2023-12-25 | Load impedance detection method and device |
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