Multi-channel modular current source power amplifier control method, system, equipment and medium

Abstract

The invention provides a multi-channel modular current source power amplifier control method, system, equipment and medium, and relates to the technical field of power amplifier devices.The method comprises the steps that the number of power amplifier channels and the number of power amplifier modules are determined, and the power amplifier channels and the power amplifier modules are defined through identification numbers; collecting current information of each power amplifier channel, and generating error data based on the current information; and based on a PI controller, outputting modulation data according to the error data, and controlling a power tube of each power amplifier channel through the modulation data. In the technical scheme of the invention, error data is adopted as the input of a PI regulator, an input excitation signal is not limited to a standard sine wave form, the input excitation signal can be formed by superposing sine wave signals of a plurality of frequency points, and real-time linear amplification can be carried out on complex signals superposed by the plurality of frequency points at the same time; the gain of each output channel of the power amplifier module is independent and can be flexibly adjusted and changed in the actual use process, so that diversified load demand scenes are met.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifier devices, and in particular to a multi-channel modular current source power amplifier control method, system, device and medium. Background Art

[0002] The full-bridge current amplifier is widely used in practical application scenarios due to its simple structure and easy control. The input excitation signal is a voltage signal, which generates two pairs of PWM (Pulse-Width Modulation) signals with dead zones through the control loop, and then distributed to the four power tubes of the full-bridge amplifier. In this process, the DC voltage on the amplifier bus is converted into AC voltage. In the scenario of a fixed AC output strategy, the output current of the amplifier can track the input excitation signal in real time and accurately, thereby achieving the linear amplification function of the input excitation signal. However, the current full-bridge current amplifier has certain limitations. Its output characteristics are sinusoidal currents at a single frequency, and the output current capacity has been determined and solidified in the initial design stage. It cannot be flexibly adjusted and changed during actual use, and it is difficult to meet diverse load demand scenarios. Summary of the invention

[0003] In order to solve or improve at least one of the above technical problems, an object of the present invention is to provide a multi-channel modular current source power amplifier control method.

[0004] Another object of the present invention is to provide a multi-channel modular current source power amplifier control system.

[0005] Another object of the present invention is to provide an electronic device.

[0006] Another object of the present invention is to provide a readable storage medium.

[0007] To achieve the above object, the first aspect of the present invention provides a multi-channel modular current source power amplifier control method for a power amplifier device. The power amplifier device includes at least one power amplifier module, and the power amplifier module includes multiple power amplifier channels.

[0008] The steps of the multi-channel modular current source power amplifier control method include:

[0009] The first step is to determine the number of power amplifier channels and the number of power amplifier modules, and define the power amplifier channels and power amplifier modules through identification numbers.

[0010] The second step is to collect current information of each power amplifier channel and generate error data based on the current information; wherein the current information includes a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal.

[0011] The third step is to output modulation data based on the error data based on a PI (Proportional-Integral) controller, and control the power tube of each power amplifier channel through the modulation data.

[0012] The present invention aims to provide a multi-channel modular current source power amplifier control method, which uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed, and can simultaneously perform real-time linear amplification on complex signals superimposed with multiple frequency points; the gain of each output channel of the power amplifier module is independent, and can be flexibly adjusted and changed during actual use, so as to meet diverse load demand scenarios.

[0013] In addition, the above technical solution provided by the present invention may also have the following additional technical features:

[0014] In some technical schemes, optionally, the steps of the multi-channel modular current source power amplifier control method also include: before collecting current information of each power amplifier channel and generating error data based on the current information, performing self-inspection on the power amplifier channel, and the power amplifier channel enters the operation mode after passing the self-inspection.

[0015] In this technical solution, in a multi-channel modular current-type power amplifier device, since there are a large number of power amplifier channels, and each power amplifier channel is relatively independent and works in coordination, self-checking is an important part of the power amplifier device to ensure the normal operation of each power amplifier channel. By self-checking each power amplifier channel, it is beneficial to improve the reliability and stability of the circuit system.

[0016] In some technical schemes, optionally, a self-check is performed on the power amplifier channel, and the power amplifier channel enters an operating mode after passing the self-check, and the steps include: checking whether at least one of the input excitation signal, temperature and output current signal is out of limit, so as to perform a self-check on the power amplifier channel; when at least one of the input excitation signal, temperature and output current signal is out of limit, the power amplifier channel fails the self-check and enters a fault mode; when the input excitation signal, temperature and output current signal are within the limit, the power amplifier channel passes the self-check and enters a standby mode; and sending a power-on command to the power amplifier channel in the standby mode through the communication board, so that the power amplifier channel enters the operating mode.

[0017] In this technical solution, in the self-test phase, the contents that need to be tested include whether the input excitation signal exceeds the limit, whether the temperature exceeds the limit, and whether the output current signal exceeds the limit. In other words, there are three conditions for judging whether the power amplifier channel self-test has passed, namely: whether the input excitation signal exceeds the limit, whether the temperature exceeds the limit, and whether the output current signal exceeds the limit.

[0018] If any one of the above three conditions is not met, the power amplifier channel self-test fails; if all of the above three conditions are met (the input excitation signal does not exceed the limit, the temperature does not exceed the limit, and the output current signal does not exceed the limit), the power amplifier channel self-test passes.

[0019] In some technical schemes, optionally, current information of each power amplifier channel is collected, and error data is generated based on the current information; wherein the current information includes a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal. The steps include: collecting current information of each power amplifier channel; wherein the current information includes a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal; determining the actual instantaneous value of the input excitation signal based on the first instantaneous value, and calculating based on the actual instantaneous value and the second instantaneous value to obtain error data.

[0020] In this technical solution, the actual instantaneous value of the input excitation signal is determined according to the first instantaneous value of the input excitation signal (the first instantaneous value is multiplied by a gain coefficient to obtain the actual instantaneous value). Error data is generated according to the actual instantaneous value of the input excitation signal and the second instantaneous value of the output current signal.

[0021] The error data is used to guide the subsequent steps to generate modulation information (modulation data).

[0022] In some technical schemes, optionally, the actual instantaneous value of the input excitation signal is determined according to the first instantaneous value, and the error data is obtained by calculation based on the actual instantaneous value and the second instantaneous value, and the steps include: multiplying the first instantaneous value by the gain coefficient to obtain the actual instantaneous value of the input excitation signal; calculating according to the actual instantaneous value and the second instantaneous value to obtain initial error data; determining an error allowable interval, the left interval endpoint of the error allowable interval is the first lower limit value, and the right interval endpoint of the error allowable interval is the first upper limit value; when the initial error data is less than the first lower limit value, the first lower limit value is used as the final error data; when the initial error data is greater than the first upper limit value, the first upper limit value is used as the final error data; when the initial error data is within the error allowable interval, the initial error data is used as the final error data.

[0023] In this technical solution, the first instantaneous value I of the input excitation signal of the power amplifier channel is collected. ref1 , and collect the second instantaneous value I of the output current signal of the power amplifier channel out1 . Will I ref1 Multiply by a gain factor K 11 , calculated by the formula (K 11 ×I ref1 ) to get the actual instantaneous value. Calculate the error between the actual instantaneous value and Iout1, recorded as IPI in1 (Error data). Set IPIin1 The lower and upper limits of in1min (first lower limit) and IPI in1max (First upper limit value). When IPI in1 Less than IPI in1min When IPI in1 The value is IPI in1min When IPI in1 Greater than IPI in1max When IPI in1 The value is IPI in1max After the current loop PI is adjusted, the modulation information IPI of the 1# amplifier channel (the amplifier channel with the identification number GF1-TD1) is output. out1 .

[0024] By setting the error tolerance interval, when the initial error data is not within the error tolerance interval, the interval endpoint of the error tolerance interval is used as the final error data. This control method is conducive to improving the tracking accuracy of the output current to the input excitation signal.

[0025] In some technical schemes, optionally, based on a PI controller, modulation data is output according to error data, and the power tube of each power amplifier channel is controlled by the modulation data. The steps include: based on the PI controller, initial modulation data is determined according to the error data; final modulation data is determined based on the initial modulation data and the modulation interval; the power tube of each power amplifier channel is controlled according to the final modulation data to output an output current after gain amplification.

[0026] In this technical solution, after comparing the final modulated data with the triangular carrier, the four power tubes of the output amplifier channel are driven, and the dead time is allocated and sent to the switch tube for driving. Through this control strategy, the output current I out1 Can track and magnify K in real time 11 The input excitation signal I ref1 .

[0027] The power amplifier module uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequencies. It can simultaneously perform real-time linear amplification on complex signals with multiple frequencies superimposed.

[0028] The gain of each output channel of the power amplifier module is independent and can be adjusted online in real time through the communication board. When the input excitation signal remains unchanged, the same output channel can adjust the gain coefficient as needed to adjust the amplitude of the output current, and automatically adjust the bus voltage of the power amplifier module to increase the upper limit of the output current of the power amplifier channel, thereby increasing the maximum output capacity of the output channel.

[0029] In some technical schemes, optionally, the final modulation data is determined based on the initial modulation data and the modulation interval, and the steps include: determining the modulation interval, the left interval endpoint of the modulation interval is the second lower limit value, and the right interval endpoint of the modulation interval is the second upper limit value; when the initial modulation data is less than the second lower limit value, the second lower limit value is used as the final modulation data; when the initial modulation data is greater than the second upper limit value, the second upper limit value is used as the final modulation data; when the initial modulation data is within the modulation interval, the initial modulation data is used as the final modulation data.

[0030] In this technical solution, IPI is set out1 The lower and upper limits of out1min (Second lower limit) and IPI out1max (Second upper limit value). When IPI out1 Less than IPI out1min When IPI out1 The value is IPI out1min When IPI out1 Greater than IPI out1max When IPI out1 The value is IPI out1max After comparing the final modulated data with the triangular carrier, the four power tubes of the output amplifier channel are driven, and after the dead time is allocated, it is sent to the switch tube for driving.

[0031] By setting the modulation interval, when the initial modulation data is not within the modulation interval, the interval endpoint of the modulation interval is used as the final modulation data. This control method is conducive to improving the tracking accuracy of the output current to the input excitation signal.

[0032] A second aspect of the present invention provides a multi-channel modular current source power amplifier control system for a power amplifier device. The power amplifier device includes at least one power amplifier module, and the power amplifier module includes multiple power amplifier channels.

[0033] The multi-channel modular current source power amplifier control system includes an identification definition module, an error data generation module and a modulation data output module.

[0034] The identification definition module is used to determine the number of power amplifier channels and the number of power amplifier modules, and define the power amplifier channels and power amplifier modules through identification numbers.

[0035] The error data generation module is used to collect current information of each power amplifier channel and generate error data based on the current information, wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal.

[0036] The modulation data output module is used to output modulation data according to error data based on a PI controller, and to control the power tube of each power amplifier channel through the modulation data.

[0037] The present invention aims to provide a multi-channel modular current source power amplifier control system, which uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed on each other, and can simultaneously perform real-time linear amplification on complex signals superimposed on multiple frequency points; the gain of each output channel of the power amplifier module is independent, and can be flexibly adjusted and changed during actual use, so as to meet diverse load demand scenarios.

[0038] The third aspect of the present invention provides an electronic device, comprising a memory and a processor. The memory stores a program or instruction that can be run on the processor, and the processor implements the steps of the multi-channel modular current source amplifier control method in any of the above technical solutions when executing the program or instruction. Therefore, the electronic device has the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0039] In a fourth aspect, the present invention provides a readable storage medium, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the multi-channel modular current source amplifier control method in any of the above technical solutions are implemented. Therefore, the readable storage medium has the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0040] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flow chart of a multi-channel modular current source power amplifier control method according to an embodiment of the present invention is shown;

[0042] Figure 2 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0043] Figure 3 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0044] Figure 4 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0045] Figure 5 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0046] Figure 6 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0047] Figure 7 A flowchart of a multi-channel modular current source power amplifier control method according to another embodiment of the present invention is shown;

[0048] Figure 8 A structural block diagram of a multi-channel modular current source power amplifier control system according to an embodiment of the present invention is shown;

[0049] Fig. 9 A structural block diagram of an electronic device according to an embodiment of the present invention is shown;

[0050] Fig.10 A structural block diagram of a power amplifier device according to an embodiment of the present invention is shown;

[0051] Fig.11 A circuit diagram of current-type power amplifier control based on instantaneous value comparison according to an embodiment of the present invention is shown.

[0052] in, Figure 8 and Fig. 9 The corresponding relationship between the reference numerals and the component names is as follows:

[0053] 200: multi-channel modular current source power amplifier control system; 210: identification definition module; 220: error data generation module; 230: modulation data output module; 300: electronic device; 310: memory; 320: processor. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0056] Refer to the following Figures 1 to 11 A multi-channel modular current source power amplifier control method, system, device and medium are described according to some embodiments of the present invention.

[0057] In one embodiment of the present invention, a multi-channel modular current source power amplifier control method is used in a power amplifier device. The power amplifier device includes at least one power amplifier module, and the power amplifier module includes multiple power amplifier channels.

[0058] It should be emphasized that the number of power amplifier modules is at least one, that is, the power amplifier modules can be one, two or more, and the power amplifier modules are flexibly set according to actual needs, taking into account factors such as the number of slots, actual needs, occupied space, and cost. In addition, in each power amplifier module, the number of power amplifier channels is multiple, and the power amplifier channels are flexibly set according to actual needs.

[0059] In a specific embodiment, Fig.10 As shown, the power amplifier device consists of four power amplifier modules, a communication board and auxiliary connecting cables. The power amplifier device is equipped with four slots, each slot corresponds to a power amplifier module, and the power amplifier modules can be installed according to actual needs, with a maximum of no more than four. Each power amplifier module includes four power amplifier channels. Each power amplifier channel is independent during operation, and only has information interaction with the communication board. There is no information interaction between power amplifier channels, and the power amplifier channels are completely decoupled in control. The input excitation signal sampling of each power amplifier channel is independent, and the output current signal sampling of each power amplifier channel is also independent. The failure of one power amplifier channel does not affect the operation of other power amplifier channels.

[0060] like Fig.10 As shown, each power amplifier module includes a power amplifier control board, four power amplifier channels and a DC power supply. The DC power supply is connected to each power amplifier channel through a connecting cable. The DC power supply is used to provide 150V DC power to the power amplifier channel.

[0061] It should be noted that Fig.10 The "150VDC" in the figure means 150V direct current. "V" means volt (unit of voltage) and "DC (Direct Current)" means direct current.

[0062] The power amplifier control board is connected to the power amplifier channel, and the power amplifier control board controls the power amplifier channel through a PWM (Pulse-Width Modulation) driving signal.

[0063] The amplifier control board and the communication board are connected through the 485 serial port (a serial communication interface that complies with the RS-485 standard). The advantages of using the 485 serial port are: strong anti-interference ability; long transmission distance; multi-station capability (capable of connecting multiple transceivers at the same time); and high data transmission rate.

[0064] like Figure 1 As shown, the steps of the multi-channel modular current source power amplifier control method include:

[0065] S102, determining the number of power amplifier channels and the number of power amplifier modules, and defining the power amplifier channels and the power amplifier modules by identification numbers.

[0066] It should be noted that the power amplifier device is configured with multiple slots, each slot corresponds to a power amplifier module, and the power amplifier module can be installed according to actual needs. Each power amplifier module includes multiple power amplifier channels.

[0067] It is determined that the number of power amplifier modules to be used is n, and the number of power amplifier channels is m.

[0068] Wherein, n is an integer greater than or equal to 1, and m is a positive integer multiple of n.

[0069] The n power amplifier modules are defined as GF1 to GFn, and the m power amplifier channels are defined as TD1 to TDm.

[0070] It should be noted that "GF" means "power amplifier", i.e., power amplifier module; "TD" means "channel", i.e., power amplifier channel. For example, the identification number of the first power amplifier channel of the first power amplifier module is GF1-TD1. The identification number of the mth power amplifier channel of the nth power amplifier module is GFn-TDm.

[0071] It should be emphasized that the hardware circuits of each power amplifier module are consistent, and only the ID number (i.e. identification number) of the power amplifier module is used as the unique identification. The output current control strategy has nothing to do with the ID number, and the number of power amplifier modules can be reasonably configured according to the output channel requirements. The ID number of the power amplifier module can be erased and modified by software, and the power amplifier modules can be interchanged at will.

[0072] S104, collecting current information of each power amplifier channel, and generating error data based on the current information; wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal.

[0073] The instantaneous value of the input excitation signal (the first instantaneous value of the input excitation signal) and the instantaneous value of the output current signal (the second instantaneous value of the output current signal) of each power amplifier channel are collected.

[0074] Error data is generated based on a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal.

[0075] Optionally, the actual instantaneous value of the input excitation signal is determined according to the first instantaneous value of the input excitation signal (the first instantaneous value is multiplied by a gain coefficient to obtain the actual instantaneous value). Error data is generated according to the actual instantaneous value of the input excitation signal and the second instantaneous value of the output current signal.

[0076] The error data is used to guide the subsequent steps to generate modulation information (modulation data).

[0077] S106, based on the PI controller, output modulation data according to the error data, and control the power tube of each power amplifier channel through the modulation data.

[0078] It should be noted that the PI (Proportional-Integral) controller is a feedback controller that combines the two control strategies of proportional control and integral control.

[0079] The proportional control part generates the control output in proportion to the current error signal (error data). The larger the value of the error data, the greater the change in the control output, which can make the system move quickly in the direction of reducing the error.

[0080] The integral control part generates the control output by integrating the error signal (error data). Its main function is to eliminate the steady-state error of the system. The integral term accumulates over time, causing the control output to change continuously until the error is zero.

[0081] The PI controller outputs modulation information (modulation data) according to the error data and the proportional and integral operation rules. The modulation information is used to distribute the drive to multiple power tubes of each power amplifier channel, thereby achieving precise control of the output current.

[0082] By adjusting the proportional gain system and integral gain coefficient of the PI controller, the performance of the power amplifier device can be optimized, such as improving the tracking accuracy of the output current to the input excitation signal, accelerating the response speed of the system, and reducing the steady-state error.

[0083] In a specific embodiment, the power amplifier device is configured with 16 power amplifier channels (the power amplifier device includes 4 power amplifier modules, and each power amplifier module includes 4 power amplifier channels). The instantaneous value of the input excitation signal and the output current signal of each power amplifier channel are collected to generate an error signal (error data); after adjustment by a PI control loop, modulation information (modulation data) is output, and the drive is distributed to the power tube of each power amplifier channel.

[0084] The collected instantaneous value of the input excitation signal (the first instantaneous value of the input excitation signal) is multiplied by a gain coefficient Kp (Kp can be less than 1), which is equivalent to the actual instantaneous value of the input excitation signal (the actual instantaneous value of the input excitation signal). After being adjusted by the control loop (PI control loop), the output current with gain amplification can be output.

[0085] The gain coefficient Kp of each power amplifier channel is independent and can be adjusted in real time through the communication board. In the case of the same power amplifier channel and the same input excitation signal, the gain can be adjusted to output different amplitudes of output current. Under certain load conditions, the output current of the power amplifier channel is proportional to the output voltage, and the maximum output voltage of the power amplifier channel is positively correlated with the bus voltage. The output current capacity of the power amplifier channel can be adjusted by increasing the bus voltage.

[0086] The present invention aims to provide a multi-channel modular current source power amplifier control method, which uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed, and can simultaneously perform real-time linear amplification on complex signals superimposed with multiple frequency points; the gain of each output channel of the power amplifier module is independent, and can be flexibly adjusted and changed during actual use, so as to meet diverse load demand scenarios.

[0087] It should be noted that the method provided by the present invention can be understood as a "multi-channel modular current source power amplifier control method" or a "modular current source power amplifier control method in which the input excitation signal is in the form of a superposition of sinusoidal signals of multiple frequencies and the gain is adjustable."

[0088] The advantages of the method (multi-channel modular current source power amplifier control method) provided by the present invention are as follows:

[0089] First, different numbers of power amplifier modules are configured according to needs, and each power amplifier module can be repeatedly selected by changing the ID number (identification number). A set of control strategies can be applied to all power amplifier modules, and the interchangeability and versatility are good.

[0090] Secondly, the input excitation signal can be in the form of a superposition of sinusoidal signals at multiple frequencies. Each amplifier channel is independent when working, and only has information interaction with the communication board. There is no information interaction between amplifier channels, and the amplifier channels are completely decoupled in control. The input excitation signal sampling of each amplifier channel is independent, and the output current signal sampling of each amplifier channel is also independent. The failure of one amplifier channel does not affect the operation of other amplifier channels.

[0091] Thirdly, the power amplifier module uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed on each other, and can simultaneously perform real-time linear amplification on complex signals with multiple frequency points superimposed on each other.

[0092] Fourthly, the gain of each output channel of the power amplifier module is independent and can be adjusted online in real time through the communication board. When the input excitation signal remains unchanged, the same output channel can adjust the gain coefficient as needed, thereby adjusting the amplitude of the output current, and automatically adjusting the bus voltage of the power amplifier module, thereby increasing the upper limit of the output current of the power amplifier channel, thereby increasing the maximum output capacity of the output channel.

[0093] In order to improve the flexibility of the output current of the power amplifier device, the gain of the output current and the input excitation signal is set to be adjustable. Under the condition that the input excitation signal remains unchanged, the output current amplitude is adjustable; under the condition of a certain load, in order to increase the upper limit of the output current of the power amplifier device, the bus voltage of the power amplifier device is set to be adjustable. When the actual output current reaches the upper limit of the current conditions, the upper limit of the output current is increased by increasing the bus voltage.

[0094] In some embodiments, optionally, Figure 2 As shown, before S104 (collecting current information of each power amplifier channel and generating error data based on the current information; wherein the current information includes a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal), the steps of the multi-channel modular current source power amplifier control method also include:

[0095] S103, performing a self-check on the power amplifier channel, and the power amplifier channel enters a running mode after passing the self-check.

[0096] When the power amplifier device is initially powered on, all power amplifier output channels (power amplifier channels) perform self-tests; check whether the input excitation signal, temperature, output current and other conditions are out of limit; if the self-test passes, it enters standby mode; if it fails, it enters fault mode; the communication board sends a power-on command to all output channels, and all power amplifier channels in standby mode are powered on, enter running mode, and start outputting current.

[0097] In a multi-channel modular current-type power amplifier device, since there are many power amplifier channels and each power amplifier channel is relatively independent and works in coordination, self-checking is an important part of the power amplifier device to ensure the normal operation of each power amplifier channel. By self-checking each power amplifier channel, it is beneficial to improve the reliability and stability of the circuit system.

[0098] The content of self-test may cover multiple aspects, including but not limited to the initial state detection of each circuit module (such as power tube, signal acquisition circuit, control circuit, etc.) in the channel (power amplifier channel), the path integrity check of key signals (such as input excitation signal, output current signal), and the monitoring of environmental parameters such as temperature to prevent failure caused by overheating.

[0099] In some embodiments, optionally, Figure 3 As shown, the step of S103 (performing self-test on the power amplifier channel, and the power amplifier channel entering the operation mode after passing the self-test) includes:

[0100] S1032, checking whether at least one of the input excitation signal, the temperature and the output current signal exceeds the limit, so as to perform a self-check on the power amplifier channel.

[0101] In the self-test phase, the contents that need to be tested include whether the input excitation signal exceeds the limit, whether the temperature exceeds the limit, and whether the output current signal exceeds the limit. In other words, there are three conditions for judging whether the power amplifier channel self-test has passed, namely: whether the input excitation signal exceeds the limit, whether the temperature exceeds the limit, and whether the output current signal exceeds the limit.

[0102] If any one of the above three conditions is not met, the power amplifier channel self-test fails; if all of the above three conditions are met (the input excitation signal does not exceed the limit, the temperature does not exceed the limit, and the output current signal does not exceed the limit), the power amplifier channel self-test passes.

[0103] S1034: When at least one of the input excitation signal, the temperature, and the output current signal exceeds the limit, the power amplifier channel self-test fails and enters a fault mode.

[0104] If any of the above three conditions is not met, the amplifier channel self-test fails and enters the fault mode. After the fault is repaired, the step of "checking whether at least one of the input excitation signal, temperature and output current signal exceeds the limit to perform self-test on the amplifier channel" is entered again until "the input excitation signal, temperature and output current signal are within the limit".

[0105] S1036: When the input excitation signal, temperature and output current signal are within the limit, the power amplifier channel passes the self-test and enters the standby mode.

[0106] When all three conditions above are met (the input excitation signal is within the limit, the temperature is within the limit, and the output current signal is within the limit), the power amplifier channel self-test passes.

[0107] S1038, sending a power-on instruction to the power amplifier channel in the standby mode through the communication board, so that the power amplifier channel enters the operating mode.

[0108] The power amplifier channel can operate normally after passing the self-test, and in response to the power-on command of the communication board, the power amplifier channel enters the operation mode.

[0109] Self-checking is an important part of the power amplifier device to ensure the normal operation of each power amplifier channel. By performing self-checking on each power amplifier channel, it is beneficial to improve the reliability and stability of the circuit system.

[0110] In a specific embodiment, the specific steps of performing self-check on the power amplifier channel include:

[0111] S201, determine whether the input incentive letter exceeds the limit and generate a first determination result.

[0112] S202, if the first judgment result is yes, the input excitation signal exceeds the limit, and the power amplifier channel self-test fails and enters the fault mode.

[0113] S203, if the first judgment result is no, the input excitation signal is within the limit, whether the temperature exceeds the limit is judged, and a second judgment result is generated.

[0114] S204, if the second judgment result is yes, the temperature exceeds the limit, and the power amplifier channel self-test fails and enters the fault mode.

[0115] S205, if the second judgment result is no, the temperature is within the limit, and whether the output current signal exceeds the limit is judged, and a third judgment result is generated.

[0116] S206, if the third judgment result is yes, the output current signal exceeds the limit, and the power amplifier channel self-test fails and enters the fault mode.

[0117] S207, if the third judgment result is no, the power amplifier channel self-test passes and enters the standby mode.

[0118] In some embodiments, optionally, Figure 4 As shown, the step of S104 (collecting current information of each power amplifier channel and generating error data based on the current information; wherein the current information includes a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal) includes:

[0119] S1042, collecting current information of each power amplifier channel; wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal.

[0120] The instantaneous value of the input excitation signal (the first instantaneous value of the input excitation signal) and the instantaneous value of the output current signal (the second instantaneous value of the output current signal) of each power amplifier channel are collected.

[0121] S1044, determining the actual instantaneous value of the input excitation signal according to the first instantaneous value, and performing calculation according to the actual instantaneous value and the second instantaneous value to obtain error data.

[0122] The actual instantaneous value of the input excitation signal is determined according to the first instantaneous value of the input excitation signal (the first instantaneous value is multiplied by a gain coefficient to obtain the actual instantaneous value). Error data is generated according to the actual instantaneous value of the input excitation signal and the second instantaneous value of the output current signal.

[0123] The error data is used to guide the subsequent steps to generate modulation information (modulation data).

[0124] In some embodiments, optionally, Figure 5 As shown, the step S1044 (determining the actual instantaneous value of the input excitation signal according to the first instantaneous value, and performing calculation according to the actual instantaneous value and the second instantaneous value to obtain error data) includes:

[0125] S1045: multiply the first instantaneous value by the gain coefficient to obtain the actual instantaneous value of the input excitation signal.

[0126] The output current control strategy is described by taking the power amplifier channel identified as GF1-TD1 as an example. The first instantaneous value I of the input excitation signal of the power amplifier channel is collected. ref1 , and collect the second instantaneous value I of the output current signal of the power amplifier channel out1 .

[0127] Will I ref1 Multiply by a gain factor K 11 , calculated by the formula (K 11 ×I ref1 ) to obtain the actual instantaneous value.

[0128] S1046, performing calculation according to the actual instantaneous value and the second instantaneous value to obtain initial error data.

[0129] Calculate the error between the actual instantaneous value and Iout1, recorded as IPI in1 (Error data).

[0130] S1047, determining an error tolerance interval, wherein the left interval endpoint of the error tolerance interval is a first lower limit value, and the right interval endpoint of the error tolerance interval is a first upper limit value.

[0131] Setting IPI in1 The lower and upper limits of in1min (first lower limit) and IPI in1max (First upper limit value) Determine whether the initial error data is within the error tolerance range.

[0132] S1048, when the initial error data is less than the first lower limit value, the first lower limit value is used as the final error data; when the initial error data is greater than the first upper limit value, the first upper limit value is used as the final error data; when the initial error data is within the allowable error range, the initial error data is used as the final error data.

[0133] When IPI in1 Less than IPI in1min When IPI in1 The value is IPI in1min When IPI in1 Greater than IPI in1max When IPI in1 The value is IPI in1max After the current loop PI is adjusted, the modulation information IPI of the 1# amplifier channel (the amplifier channel with the identification number GF1-TD1) is output. out1 .

[0134] By setting the error tolerance interval, when the initial error data is not within the error tolerance interval, the interval endpoint of the error tolerance interval is used as the final error data. This control method is conducive to improving the tracking accuracy of the output current to the input excitation signal.

[0135] In some embodiments, optionally, Figure 6 As shown, the step of S106 (based on the PI controller, outputting modulation data according to the error data, and controlling the power tube of each power amplifier channel through the modulation data) includes:

[0136] S1062, based on the PI controller, determine initial modulation data according to the error data.

[0137] The output current control strategy is described by taking the power amplifier channel with identification number GF1-TD1 as an example. After the current loop PI adjustment, the modulation information IPI of the 1# power amplifier channel (the power amplifier channel with identification number GF1-TD1) is output. out1 , and limit the amplitude.

[0138] It should be noted that the current loop refers to a feedback control loop built around the current signal. The "error data" here refers to the "final error data".

[0139] S1064, determining final modulation data based on the initial modulation data and the modulation interval.

[0140] Setting IPI out1 The lower and upper limits of out1min (Second lower limit) and IPI out1max (Second upper limit value).

[0141] When IPI out1 Less than IPIout1min When IPI out1 The value is IPI out1min When IPI out1 Greater than IPI out1max When IPI out1 The value is IPI out1max .

[0142] S1066, controlling the power tube of each power amplifier channel according to the final modulation data to output an output current after gain amplification.

[0143] After comparing the final modulated data with the triangular carrier, the drive of the four power tubes of the 1# power amplifier channel is output, and the dead time is allocated and sent to the switch tube for driving. Through this control strategy, the output current I out1 Can track and magnify K in real time 11 The input excitation signal I ref1 It should be noted that when K 11 =1, I out1 =I ref1 , the output current completely follows the input excitation signal I ref1 .

[0144] The power amplifier module uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequencies. It can simultaneously perform real-time linear amplification on complex signals with multiple frequencies superimposed.

[0145] The gain of each output channel of the power amplifier module is independent and can be adjusted online in real time through the communication board. When the input excitation signal remains unchanged, the same output channel can adjust the gain coefficient as needed to adjust the amplitude of the output current, and automatically adjust the bus voltage of the power amplifier module to increase the upper limit of the output current of the power amplifier channel, thereby increasing the maximum output capacity of the output channel.

[0146] In some embodiments, optionally, Figure 7 As shown, the step of S1064 (determining final modulation data based on initial modulation data and modulation interval) includes:

[0147] S1067, determine the modulation interval, the left interval endpoint of the modulation interval is the second lower limit value, and the right interval endpoint of the modulation interval is the second upper limit value.

[0148] Setting IPI out1 The lower and upper limits of out1min (Second lower limit) and IPI out1max (Second upper limit value).

[0149] S1068, when the initial modulation data is less than the second lower limit value, the second lower limit value is used as the final modulation data; when the initial modulation data is greater than the second upper limit value, the second upper limit value is used as the final modulation data; when the initial modulation data is within the modulation interval, the initial modulation data is used as the final modulation data.

[0150] When IPI out1 Less than IPI out1min When IPI out1 The value is IPI out1min When IPI out1 Greater than IPI out1max When IPI out1 The value is IPI out1max .

[0151] After comparing the final modulated data with the triangular carrier, the drive of the four power tubes of the 1# power amplifier channel is output, and the dead time is allocated and sent to the switch tube for driving. Through this control strategy, the output current I out1 Can track and magnify K in real time 11 The input excitation signal I ref1 It should be noted that when K 11 =1, I out1 =I ref1 , the output current completely follows the input excitation signal I ref1 .

[0152] By setting the modulation interval, when the initial modulation data is not within the modulation interval, the interval endpoint of the modulation interval is used as the final modulation data. This control method is conducive to improving the tracking accuracy of the output current to the input excitation signal.

[0153] In some embodiments, optionally, after S1066 (controlling the power tube of each power amplifier channel according to the final modulation data to output the output current after gain amplification), the step of S106 (outputting the modulation data according to the error data based on the PI controller, and controlling the power tube of each power amplifier channel through the modulation data) further includes:

[0154] S1069, maintaining the input excitation signal of the power amplifier channel unchanged, changing the gain coefficient of the power amplifier channel, thereby adjusting the output current of the power amplifier channel.

[0155] The output current control strategy is described by taking the power amplifier channel identified as GF1-TD1 as an example. Maintain the input excitation signal I of the power amplifier channel identified as GF1-TD1 ref1 The gain coefficient of the GF1-TD1 amplifier channel (the amplifier channel with the identification number GF1-TD1) is modified in real time through the 485 bus from K11 Change to K 12 , thereby adjusting the output current of the GF1-TD1 amplifier channel (from K 11 ×I ref1 Adjust to K 12 ×I ref1 ).

[0156] It should be noted that the 485 bus is the 485 serial port (a serial communication interface that complies with the RS-485 standard). The advantages of using the 485 serial port are: strong anti-interference ability; long transmission distance; multi-station capability (capable of connecting multiple transceivers at the same time); and high data transmission rate.

[0157] In some embodiments, optionally, after S1066 (controlling the power tube of each power amplifier channel according to the final modulation data to output the output current after gain amplification), the step of S106 (outputting the modulation data according to the error data based on the PI controller, and controlling the power tube of each power amplifier channel through the modulation data) further includes:

[0158] S1070, maintaining the input excitation signal of the power amplifier channel unchanged, changing the bus voltage of the power amplifier channel, thereby adjusting the output current upper limit of the power amplifier channel.

[0159] When the gain factor K 11 When the expected output current increases due to reasons such as the voltage increasing, and the current bus voltage is insufficient to output the current, the bus voltage needs to be raised.

[0160] The output current control strategy is described by taking the power amplifier channel identified as GF1-TD1 as an example. Maintain the input excitation signal I of the power amplifier channel identified as GF1-TD1 ref1 The bus voltage of the GF1-TD1 amplifier channel is modified in real time through the 485 bus, from 150V to 200V, thereby increasing the output current limit by about 33%.

[0161] In some embodiments, optionally, the step of changing the bus voltage of the power amplifier channel includes:

[0162] S1071, measure the impedance of the current load and determine the expected value of the output current.

[0163] When the gain factor K 11 When the expected output current increases due to reasons such as the increase in the output current, and the current bus voltage is insufficient to output the current, the bus voltage needs to be raised. Before changing the bus voltage of the power amplifier channel, it is necessary to determine the load impedance and the expected output current.

[0164] S1072, evaluating the expected value of the output voltage according to the impedance of the current load and the expected value of the output current.

[0165] S1073, based on the principle of unchanged modulation ratio, adjust the bus voltage of the power amplifier channel according to the expected value of the output voltage.

[0166] The expected output current value is multiplied by the impedance of the current load to evaluate the expected output voltage value. Based on the principle of unchanged modulation ratio, the power amplifier module sends a bus voltage regulation instruction to the power supply to complete the voltage regulation.

[0167] In some embodiments, optionally, the step of measuring the impedance of the current load includes:

[0168] S1074, the power amplifier channel enters the standby mode.

[0169] S1075, turning off the driving of the power tube of the power amplifier channel, and when the output current is reduced to less than or equal to the first threshold, constructing a square wave driving signal with a duty cycle of 50% and distributing it to the power tube.

[0170] Optionally, the first threshold is 0.5 A, wherein A is a current unit, representing ampere.

[0171] Turn off all four power tube drivers of the power amplifier channel, wait for the output current to drop below 0.5A, construct a square wave drive signal with a duty cycle of 50% and distribute it to the four power tubes. At this time, the output voltage of the power amplifier channel is a large square wave and the output current is a triangle wave.

[0172] It should be noted that the duty cycle refers to the ratio of the duration of a positive pulse to the total pulse period in an ideal pulse sequence (such as a square wave), usually expressed as a percentage.

[0173] The duty cycle of the square wave driving signal is , which means that in one pulse cycle, the high level time and the low level time are equal. The square wave signal with this specific duty cycle is used to drive the power tube so that the load impedance can be measured later.

[0174] A large square wave means that the voltage waveform output by the power amplifier channel presents a square wave shape with a relatively large amplitude. A triangle wave is a signal with a waveform shape similar to a triangle.

[0175] S1076, based on FFT (Fast Fourier Transform) analysis, determine the fundamental phase of the output voltage and the fundamental amplitude of the output current, and calculate the impedance of the current load according to the fundamental phase of the output voltage and the fundamental amplitude of the output current.

[0176] In a specific embodiment, Fig.11The circuit diagram of a current-type power amplifier control based on instantaneous value comparison is shown in the figure. Among them, "Udc" represents the DC power supply voltage, which is used to provide electrical energy. "C1" represents a capacitor, which is used to filter and smooth the current and voltage and reduce voltage fluctuations. "S1", "S2", "S3" and "S4" represent switching elements, which are used to control the on and off of the current. "L1" represents an inductor, which is used to store and release energy and smooth the current. "L" represents a load, which represents a device or circuit connected to the output end of the power amplifier. "lout" represents the output current. "PWM distribution" represents a PWM (pulse width modulation) distribution signal. "PI" represents a PI controller. "K11" represents a gain factor. "lout_ref" represents the expected value of the output current.

[0177] The power amplifier device is configured with 4 slots, and all the 4 slots are filled with power amplifier modules. The 4 power amplifier modules are defined as GF1 to GF4 by identification numbers. Each power amplifier module includes 4 power amplifier channels, and the 4 power amplifier channels are defined as TD1 to TD4 by identification numbers.

[0178] When the power amplifier device is initially powered on, all power amplifier output channels (power amplifier channels) perform self-tests; check whether the input excitation signal, temperature, output current and other conditions are out of limit; if the self-test passes, it enters standby mode; if it fails, it enters fault mode; the communication board sends a power-on command to all output channels, and all power amplifier channels in standby mode are powered on, enter running mode, and start outputting current.

[0179] The output current control strategy is described by taking the power amplifier channel identified as GF1-TD1 as an example. The first instantaneous value I of the input excitation signal of the power amplifier channel is collected. ref1 , and collect the second instantaneous value I of the output current signal of the power amplifier channel out1 .

[0180] Will I ref1 Multiply by a gain factor K 11 , calculated by the formula (K 11 ×I ref1 ) to obtain the actual instantaneous value.

[0181] Calculate the error between the actual instantaneous value and Iout1, recorded as IPI in1 (Error data).

[0182] Setting IPI in1 The lower and upper limits of in1min (first lower limit) and IPI in1max (first upper limit value).

[0183] When IPI in1 Less than IPI in1min When IPI in1The value is IPI in1min When IPI in1 Greater than IPI in1max When IPI in1 The value is IPI in1max .

[0184] After the current loop PI is adjusted, the modulation information IPI of the 1# power amplifier channel (the power amplifier channel with identification number GF1-TD1) is output out1 , and limit the amplitude.

[0185] It should be noted that the current loop refers to a feedback control loop built around the current signal.

[0186] Setting IPI out1 The lower and upper limits of out1min (Second lower limit) and IPI out1max (Second upper limit value).

[0187] When IPI out1 Less than IPI out1min When IPI out1 The value is IPI out1min When IPI out1 Greater than IPI out1max When IPI out1 The value is IPI out1max .

[0188] After comparing the final modulated data with the triangular carrier, the drive of the four power tubes of the 1# power amplifier channel is output, and the dead time is allocated and sent to the switch tube for driving. Through this control strategy, the output current I out1 Can track and magnify K in real time 11 The input excitation signal I ref1 It should be noted that when K 11 =1, I out1 =I ref1 , the output current completely follows the input excitation signal I ref1 .

[0189] Maintain the input excitation signal I of the power amplifier channel identified as GF1-TD1 ref1 The gain coefficient of the GF1-TD1 amplifier channel (the amplifier channel with the identification number GF1-TD1) is modified in real time through the 485 bus from K 11 Change to K 12 , thereby adjusting the output current of the GF1-TD1 amplifier channel (from K 11 ×I ref1 Adjust to K 12 ×I ref1 ).

[0190] Maintain the input excitation signal I of the power amplifier channel identified as GF1-TD1 ref1 The bus voltage of the GF1-TD1 amplifier channel is modified in real time through the 485 bus, from 150V to 200V, thereby increasing the output current limit by about 33%.

[0191] When the gain factor K 11 When the expected value of the output current increases due to reasons such as the increase in the load voltage, and the current bus voltage is insufficient to output the current, the bus voltage needs to be raised. The steps of the bus voltage automatic adjustment method include: measuring the impedance of the current load and determining the expected value of the output current; multiplying the expected value of the output current by the impedance of the current load to evaluate the expected value of the output voltage; based on the principle of unchanged modulation ratio, the power amplifier module sends a bus voltage adjustment instruction to the power supply to complete the voltage adjustment.

[0192] The method for measuring the impedance of the current load is: first enter the standby mode and turn off all four power tube drivers of the power amplifier channel; wait for the output current to drop below 0.5A, construct a square wave drive signal with a duty cycle of 50% and distribute it to the four power tubes. At this time, the output voltage of the power amplifier channel is a large square wave and the output current is a triangle wave; use FFT to analyze the fundamental phase of the output voltage and the fundamental amplitude of the output current, so as to calculate the impedance of the current load.

[0193] In one embodiment of the present invention, a multi-channel modular current source power amplifier control system 200 is used in a power amplifier device. The power amplifier device includes at least one power amplifier module, and the power amplifier module includes multiple power amplifier channels.

[0194] It should be emphasized that the number of power amplifier modules is at least one, that is, the power amplifier modules can be one, two or more, and the power amplifier modules are flexibly set according to actual needs, taking into account factors such as the number of slots, actual needs, occupied space, and cost. In addition, in each power amplifier module, the number of power amplifier channels is multiple, and the power amplifier channels are flexibly set according to actual needs.

[0195] like Figure 8 As shown, the multi-channel modular current source power amplifier control system 200 includes an identification definition module 210 , an error data generation module 220 and a modulation data output module 230 .

[0196] The identification definition module 210 is used to determine the number of power amplifier channels and the number of power amplifier modules, and define the power amplifier channels and the power amplifier modules through identification numbers.

[0197] It should be noted that the power amplifier device is configured with multiple slots, each slot corresponds to a power amplifier module, and the power amplifier module can be installed according to actual needs. Each power amplifier module includes multiple power amplifier channels.

[0198] It is determined that the number of power amplifier modules to be used is n, and the number of power amplifier channels is m.

[0199] Wherein, n is an integer greater than or equal to 1, and m is a positive integer multiple of n.

[0200] The n power amplifier modules are defined as GF1 to GFn, and the m power amplifier channels are defined as TD1 to TDm.

[0201] It should be noted that "GF" means "power amplifier", i.e., power amplifier module; "TD" means "channel", i.e., power amplifier channel. For example, the identification number of the first power amplifier channel of the first power amplifier module is GF1-TD1. The identification number of the mth power amplifier channel of the nth power amplifier module is GFn-TDm.

[0202] It should be emphasized that the hardware circuits of each power amplifier module are consistent, and only the ID number (i.e. identification number) of the power amplifier module is used as the unique identification. The output current control strategy has nothing to do with the ID number, and the number of power amplifier modules can be reasonably configured according to the output channel requirements. The ID number of the power amplifier module can be erased and modified by software, and the power amplifier modules can be interchanged at will.

[0203] The error data generation module 220 is used to collect current information of each power amplifier channel and generate error data based on the current information, wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal.

[0204] The instantaneous value of the input excitation signal (the first instantaneous value of the input excitation signal) and the instantaneous value of the output current signal (the second instantaneous value of the output current signal) of each power amplifier channel are collected.

[0205] Error data is generated based on a first instantaneous value of the input excitation signal and a second instantaneous value of the output current signal.

[0206] Optionally, the actual instantaneous value of the input excitation signal is determined according to the first instantaneous value of the input excitation signal (the first instantaneous value is multiplied by a gain coefficient to obtain the actual instantaneous value). Error data is generated according to the actual instantaneous value of the input excitation signal and the second instantaneous value of the output current signal.

[0207] The error data is used to guide the subsequent steps to generate modulation information (modulation data).

[0208] The modulation data output module 230 is used to output modulation data according to the error data based on the PI controller, and control the power tube of each power amplifier channel through the modulation data.

[0209] It should be noted that the PI (Proportional-Integral) controller is a feedback controller that combines the two control strategies of proportional control and integral control.

[0210] The proportional control part generates the control output in proportion to the current error signal (error data). The larger the value of the error data, the greater the change in the control output, which can make the system move quickly in the direction of reducing the error.

[0211] The integral control part generates the control output by integrating the error signal (error data). Its main function is to eliminate the steady-state error of the system. The integral term accumulates over time, causing the control output to change continuously until the error is zero.

[0212] The PI controller outputs modulation information (modulation data) according to the error data and the proportional and integral operation rules. The modulation information is used to distribute the drive to multiple power tubes of each power amplifier channel, thereby achieving precise control of the output current.

[0213] By adjusting the proportional gain system and integral gain coefficient of the PI controller, the performance of the power amplifier device can be optimized, such as improving the tracking accuracy of the output current to the input excitation signal, accelerating the response speed of the system, and reducing the steady-state error.

[0214] The present invention aims to provide a multi-channel modular current source power amplifier control system 200, which uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed, and can simultaneously perform real-time linear amplification on complex signals superimposed with multiple frequency points; the gain of each output channel of the power amplifier module is independent, and can be flexibly adjusted and changed during actual use to meet diverse load demand scenarios.

[0215] It should be noted that the system provided by the present invention can be understood as a "multi-channel modular current-type power amplifier device control system" or as a "modular current source power amplifier control system in which the input excitation signal is in the form of a superposition of sinusoidal signals of multiple frequencies and has adjustable gain."

[0216] The advantages of the system (multi-channel modular current source power amplifier control system 200) provided by the present invention are as follows:

[0217] First, different numbers of power amplifier modules are configured according to needs, and each power amplifier module can be repeatedly selected by changing the ID number (identification number). A set of control strategies can be applied to all power amplifier modules, and the interchangeability and versatility are good.

[0218] Secondly, the input excitation signal can be in the form of a superposition of sinusoidal signals at multiple frequencies. Each amplifier channel is independent when working, and only has information interaction with the communication board. There is no information interaction between amplifier channels, and the amplifier channels are completely decoupled in control. The input excitation signal sampling of each amplifier channel is independent, and the output current signal sampling of each amplifier channel is also independent. The failure of one amplifier channel does not affect the operation of other amplifier channels.

[0219] Thirdly, the power amplifier module uses error data (the error data is determined based on the second instantaneous value of the output current signal and the first instantaneous value of the input excitation signal) as the input of the PI regulator. The input excitation signal is not limited to the standard sinusoidal wave form. The input excitation signal can be composed of sinusoidal wave signals of multiple frequency points superimposed on each other, and can simultaneously perform real-time linear amplification on complex signals with multiple frequency points superimposed on each other.

[0220] Fourthly, the gain of each output channel of the power amplifier module is independent and can be adjusted online in real time through the communication board. When the input excitation signal remains unchanged, the same output channel can adjust the gain coefficient as needed, thereby adjusting the amplitude of the output current, and automatically adjusting the bus voltage of the power amplifier module, thereby increasing the upper limit of the output current of the power amplifier channel, thereby increasing the maximum output capacity of the output channel.

[0221] In order to improve the flexibility of the output current of the power amplifier device, the gain of the output current and the input excitation signal is set to be adjustable. Under the condition that the input excitation signal remains unchanged, the output current amplitude is adjustable; under the condition of a certain load, in order to increase the upper limit of the output current of the power amplifier device, the bus voltage of the power amplifier device is set to be adjustable. When the actual output current reaches the upper limit of the current conditions, the upper limit of the output current is increased by increasing the bus voltage.

[0222] In one embodiment according to the present invention, Fig. 9 As shown, the electronic device 300 includes a memory 310 and a processor 320. The memory 310 stores a program or instruction that can be run on the processor 320, and the processor 320 implements the steps of the multi-channel modular current source amplifier control method in any of the above embodiments when executing the program or instruction. Therefore, the electronic device 300 has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0223] In one embodiment of the present invention, the readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the multi-channel modular current source amplifier control method in any of the above embodiments are implemented. Therefore, the readable storage medium has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0224] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0225] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0226] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0227] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-channel modular current source power amplifier control method, characterized in that: Used for a power amplifier device, the power amplifier device includes at least one power amplifier module, the power amplifier module includes multiple power amplifier channels, and the multi-channel modular current source power amplifier control method includes: Determine the number of the power amplifier channels and the number of the power amplifier modules, and define the power amplifier channels and the power amplifier modules by identification numbers; Collecting current information of each power amplifier channel and generating error data based on the current information; wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal; Based on the PI controller, modulation data is output according to the error data, and the power tube of each power amplifier channel is controlled by the modulation data.

2. The multi-channel modular current source power amplifier control method according to claim 1, characterized in that: Also includes: Before collecting the current information of each power amplifier channel and generating error data based on the current information, the power amplifier channel is self-checked, and the power amplifier channel enters the operation mode after passing the self-check.

3. The multi-channel modular current source power amplifier control method according to claim 2, characterized in that: The self-checking of the power amplifier channel, and the power amplifier channel entering the operation mode after passing the self-check, includes: Checking whether at least one of the input excitation signal, the temperature and the output current signal exceeds a limit, so as to perform a self-check on the power amplifier channel; When at least one of the input excitation signal, the temperature and the output current signal exceeds the limit, the power amplifier channel fails the self-test and enters the fault mode; When the input excitation signal, the temperature and the output current signal are within the limit, the power amplifier channel passes the self-check and enters the standby mode; A power-on instruction is sent to the power amplifier channel in the standby mode through the communication board, so that the power amplifier channel enters the operating mode.

4. The multi-channel modular current source power amplifier control method according to any one of claims 1 to 3, characterized in that: The current information of each power amplifier channel is collected, and error data is generated based on the current information; wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal, including: Collecting the current information of each power amplifier channel; wherein the current information includes the first instantaneous value of the input excitation signal and the second instantaneous value of the output current signal; The actual instantaneous value of the input excitation signal is determined according to the first instantaneous value, and the error data is obtained by performing calculation according to the actual instantaneous value and the second instantaneous value.

5. The multi-channel modular current source power amplifier control method according to claim 4, characterized in that: Determining the actual instantaneous value of the input excitation signal according to the first instantaneous value, and performing calculation according to the actual instantaneous value and the second instantaneous value to obtain error data, includes: Multiplying the first instantaneous value by a gain coefficient to obtain the actual instantaneous value of the input excitation signal; Calculating according to the actual instantaneous value and the second instantaneous value to obtain initial error data; Determine an error tolerance interval, wherein a left interval endpoint of the error tolerance interval is a first lower limit value, and a right interval endpoint of the error tolerance interval is a first upper limit value; When the initial error data is less than the first lower limit value, the first lower limit value is used as the final error data; when the initial error data is greater than the first upper limit value, the first upper limit value is used as the final error data; when the initial error data is within the allowable error range, the initial error data is used as the final error data.

6. The multi-channel modular current source power amplifier control method according to any one of claims 1 to 3, characterized in that: The PI-based controller outputs modulation data according to the error data, and controls the power tube of each power amplifier channel through the modulation data, including: Based on the PI controller, determining initial modulation data according to the error data; Determine final modulation data based on the initial modulation data and the modulation interval; The power tube of each power amplifier channel is controlled according to the final modulation data to output an output current after gain amplification.

7. The multi-channel modular current source power amplifier control method according to claim 6, characterized in that: The determining of final modulation data based on the initial modulation data and the modulation interval comprises: Determine the modulation interval, the left interval endpoint of the modulation interval is the second lower limit value, and the right interval endpoint of the modulation interval is the second upper limit value; When the initial modulation data is less than the second lower limit value, the second lower limit value is used as the final modulation data; when the initial modulation data is greater than the second upper limit value, the second upper limit value is used as the final modulation data; when the initial modulation data is within the modulation interval, the initial modulation data is used as the final modulation data.

8. A multi-channel modular current source power amplifier control system, characterized in that: include: An identification definition module (210), used to determine the number of power amplifier channels and the number of power amplifier modules, and define the power amplifier channels and the power amplifier modules by identification numbers; An error data generating module (220) is used to collect current information of each power amplifier channel and generate error data based on the current information; wherein the current information includes a first instantaneous value of an input excitation signal and a second instantaneous value of an output current signal; A modulation data output module (230) is used to output modulation data according to the error data based on a PI controller, and to control the power tube of each power amplifier channel through the modulation data.

9. An electronic device, characterized in that: include: A memory (310) and a processor (320), wherein the memory (310) stores a program or instruction that can be run on the processor (320), and when the processor (320) executes the program or the instruction, the steps of the multi-channel modular current source power amplifier control method as described in any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the steps of the multi-channel modular current source power amplifier control method according to any one of claims 1 to 7 are implemented.

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