PAM+PWM-based signal modulation method and device, equipment and medium

Abstract

The application discloses a PAM+PWM-based signal modulation method and device, equipment and medium, and relates to the technical field of electricity. The method comprises the following steps: acquiring an original modulation wave and generating a step wave for controlling a first switch module and a sector wave for controlling a second switch module; performing horizontal reduction on the original modulation wave to obtain a first sinusoidal modulation wave and determining whether the power corresponding to the first switch module and the second switch module is in a balanced state; when the power is not in the balanced state, performing vertical reduction on the first sinusoidal modulation wave to obtain a second sinusoidal modulation wave, and modulating the second sinusoidal modulation wave for the purpose of jointly optimizing power balance and efficiency.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to signal modulation methods, apparatus, devices and media based on PAM+PWM. Background Technology

[0002] With the continuous development of social science and technology, the national electricity consumption is increasing day by day, and the problem of power quality is becoming more and more important. Therefore, the research needs for high-quality energy management systems (Static Var Generator (SVG) and Static Synchronous Compensator (STATCOM)) and energy management + energy transmission systems (energy routers) are becoming more and more urgent. Figure 1 For the existing cascaded H-bridge topology diagram, such as Figure 1 As shown, the common topology of existing SVG, STATCOM, and energy routers is the cascaded H-bridge topology. This topology can collectively handle a very high voltage by cascading, while ensuring that the voltage of each module is not high. Currently, the modulation scheme for cascaded H-bridges in SVG, STATCOM, and energy routers is generally Pulse Amplitude Modulation (PAM) + Pulse Width Modulation (PWM). The existing PAM+PWM modulation method only balances power through pulse alternation, which can only guarantee power balance among low-frequency modules over multiple cycles. However, due to physical characteristics, the energy flowing into high-frequency modules during the power frequency cycle is relatively small. This leads to a perpetual power imbalance between high-frequency and low-frequency modules, resulting in increased conduction losses of system switching devices and reduced system efficiency. In addition, power imbalance leads to higher power in some modules, placing higher demands on the capacity limits of transformers, capacitors, and other devices, thus increasing device costs.

[0003] Given the aforementioned problems, finding a way to balance the power of high-frequency and low-frequency modules without increasing device costs is a problem that those skilled in the art are striving to solve. Summary of the Invention

[0004] The purpose of this application is to provide a signal modulation method, apparatus, device and medium based on PAM+PWM, for balancing the power of high-frequency modules and low-frequency modules without increasing device cost, wherein the high-frequency module corresponds to the second switching module of this application and the low-frequency module corresponds to the first switching module of this application.

[0005] To address the aforementioned technical problems, this application provides a signal modulation method based on PAM+PWM, applied to a CHB topology containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switch in the second switching module is greater than the switching frequency of each switch in the first switching module, comprising:

[0006] The original modulation wave is obtained, wherein the stepped wave representing the control of the first switching module and the fan-shaped wave representing the control of the second switching module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave.

[0007] The original modulated wave is horizontally reduced to obtain the first sinusoidal modulated wave;

[0008] Determine whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave;

[0009] When the first sinusoidal modulation wave cannot bring the power of the first and second switching modules into a balanced state, the first sinusoidal modulation wave is longitudinally reduced to obtain the second sinusoidal modulation wave.

[0010] With the aim of jointly optimizing power balance and efficiency, modulation is performed based on the second sine modulation wave.

[0011] Preferably, the lateral reduction of the original modulated wave includes:

[0012] Under the conditions of central symmetry and a first preset requirement, the original modulated wave is horizontally reduced. The first preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulated wave does not exceed the total voltage of the second switching module, and the total power of the first switching module does not exceed a preset power value of the total power of all switching modules. The total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules.

[0013] Preferably, longitudinal reduction of the first sinusoidal modulated wave includes:

[0014] Based on central symmetry and a second preset requirement, the first sinusoidal modulation wave is longitudinally reduced. The second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave does not exceed the total voltage of the second switching module, and the power is balanced based on the balance between the efficiency increase and efficiency decrease when the first and second switching modules are balanced.

[0015] Preferably, determining whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave includes:

[0016] Obtain the first power corresponding to the first switch module and the second power corresponding to the second switch module;

[0017] Determine whether the difference between the first power and the second power is within the preset power range;

[0018] If so, then it is determined that the power corresponding to the first switching module and the second switching module is in a balanced state;

[0019] If not, then it is determined that the power of the first switching module and the second switching module is not in an unbalanced state.

[0020] Preferably, obtaining the original modulated wave includes:

[0021] The original modulation wave is determined based on the outer voltage loop and the inner current loop.

[0022] Preferably, after determining that the power corresponding to the first switching module and the second switching module is in a balanced state, the method further includes:

[0023] The output displays the first indication that the power is in a balanced state.

[0024] Preferably, after determining that the power corresponding to the first switching module and the second switching module is not in an unbalanced state, the method further includes:

[0025] The output displays a second message indicating that the power is in a balanced state.

[0026] To address the aforementioned technical problems, this application also provides a signal modulation device based on PAM+PWM, applied to a CHB topology containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switch in the second switching module is greater than the switching frequency of each switch in the first switching module, comprising:

[0027] The first acquisition module is used to acquire the original modulation wave, wherein the stepped wave representing the control of the first switching module and the fan-shaped wave representing the control of the second switching module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave.

[0028] The first transverse reduction module is used to transversely reduce the original modulated wave to obtain the first sinusoidal modulated wave.

[0029] The first determining module is used to determine whether the power corresponding to the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave.

[0030] The first longitudinal reduction module is used to longitudinally reduce the first sinusoidal modulation wave to obtain the second sinusoidal modulation wave when the power corresponding to the first and second switching modules cannot be balanced according to the first sinusoidal modulation wave.

[0031] The modulation module is used to modulate based on a second sinusoidal modulation wave for the purpose of jointly optimizing power equalization and efficiency.

[0032] In addition, the device also includes the following modules:

[0033] Preferably, the lateral reduction of the original modulated wave includes:

[0034] The second lateral reduction module is used to laterally reduce the original modulated wave under the conditions of central symmetry and a first preset requirement. The first preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulated wave does not exceed the total voltage of the second switching module, and the total power of the first switching module does not exceed a preset power value of the total power of all switching modules. The total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules.

[0035] Preferably, longitudinal reduction of the first sinusoidal modulated wave includes:

[0036] The second longitudinal reduction module is used to longitudinally reduce the first sinusoidal modulation wave under the conditions of central symmetry and a second preset requirement. The second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave does not exceed the total voltage of the second switching module, and the power is balanced under the condition that the efficiency increase and efficiency decrease values ​​when the first and second switching modules are balanced.

[0037] Preferably, determining whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave includes:

[0038] The second acquisition module is used to acquire the first power corresponding to the first switch module and the second power corresponding to the second switch module;

[0039] The judgment module is used to determine whether the difference between the first power and the second power is within a preset power range;

[0040] If so, the second determination module is triggered to determine that the power of the first switching module and the second switching module is in a balanced state.

[0041] If not, the third determination module is triggered to determine that the power of the first and second switching modules is not in an unbalanced state.

[0042] Preferably, obtaining the original modulated wave includes:

[0043] The fourth determination module is used to determine the original modulation wave based on the voltage outer loop and the current inner loop.

[0044] Preferably, after determining that the power corresponding to the first switching module and the second switching module is in a balanced state, the method further includes:

[0045] The first output module is used to output a first prompt message indicating that the power is in a balanced state.

[0046] Preferably, after determining that the power corresponding to the first switching module and the second switching module is not in an unbalanced state, the method further includes:

[0047] The second output module is used to output a second prompt message indicating that the power is in a balanced state.

[0048] To address the aforementioned technical problems, this application also provides a signal modulation device based on PAM+PWM, comprising:

[0049] Memory, used to store computer programs;

[0050] A processor is used to direct computer programs to implement the steps of a signal modulation method based on PAM+PWM.

[0051] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements all the steps of the above-mentioned PAM+PWM-based signal modulation method.

[0052] This application provides a signal modulation method based on PAM+PWM, applied to a CHB topology containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switch in the second switching module is greater than the switching frequency of each switch in the first switching module. The method includes: acquiring an original modulation wave and generating a stepped wave representing the control of the first switching module and a fan-shaped wave representing the control of the second switching module; horizontally reducing the original modulation wave to obtain a first sinusoidal modulation wave and determining whether the power corresponding to the first and second switching modules is in a balanced state; when not in a balanced state, vertically reducing the first sinusoidal modulation wave to obtain a second sinusoidal modulation wave, and modulating according to the second sinusoidal modulation wave with the aim of jointly optimizing power balance and efficiency.

[0053] This application also provides a signal modulation device, equipment, and medium based on PAM+PWM, with the same effect as above. Attached Figure Description

[0054] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1Diagram of the existing cascaded H-bridge topology;

[0056] Figure 2 A schematic diagram of an existing stepped wave obtained by stepped wave modulation;

[0057] Figure 3 This is a schematic diagram of a triangular carrier and a sinusoidal modulated wave obtained through carrier phase-shift modulation.

[0058] Figure 4 A simplified topology diagram of a signal modulation circuit based on PAM+PWM is provided in this application;

[0059] Figure 5 A DC-DC circuit diagram provided in this application;

[0060] Figure 6 A flowchart of a signal modulation method based on PAM+PWM provided in an embodiment of this application;

[0061] Figure 7 A schematic diagram of an unmodulated waveform provided in this application;

[0062] Figure 8 A schematic diagram illustrating a lateral reduction of the original modulated wave provided in this application;

[0063] Figure 9 A schematic diagram of longitudinal reduction of a first sinusoidal modulated wave provided in this application;

[0064] Figure 10 A schematic diagram of the second sinusoidal modulation wave provided in this application;

[0065] Figure 11 A structural diagram of a signal modulation device based on PAM+PWM provided in an embodiment of this application;

[0066] Figure 12 This is a structural diagram of a signal modulation device based on PAM+PWM provided in an embodiment of this application.

[0067] Among them, 40 is the first switch module and 41 is the second switch module. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0069] The core of this application is to provide a signal modulation method, device, equipment and medium based on PAM+PWM, which can balance the power of high-frequency module and low-frequency module without increasing the cost of components. The high-frequency module corresponds to the second switching module of this application and the low-frequency module corresponds to the first switching module of this application.

[0070] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] With the continuous development of social technology, the national electricity consumption is increasing daily, and the issue of power quality is becoming increasingly important. On the one hand, electricity users hope that the power provided by the public power grid is stable enough, including amplitude, frequency, etc., to ensure the long-term reliable operation of electrical equipment and increase its service life. On the other hand, power suppliers put forward various requirements for electrical equipment connected to the grid, such as power factor, harmonic current, etc., to ensure the reliability of power supply. Therefore, the research needs for high-quality energy management systems (Static Var Generator (SVG), Static Synchronous Compensator (STATCOM)) and energy management + energy transmission systems (energy routers) are becoming increasingly urgent. Several topologies have emerged to meet this need, including diode-clamped multilevel converters, flying capacitor converters, cascaded H-bridge multilevel converters (CHB), and modular multilevel converters. Based on this, there are several common modulation methods: carrier-layered PWM modulation, carrier phase-shifted PWM modulation, space vector modulation (SVPWM), and stepped wave modulation. Among them, stepped wave modulation is divided into closest level approximation modulation and specific elimination method modulation. If the edge of the step is connected to the modulation wave, it is pulse amplitude modulation (PAM). PAM modulation method is often improved and used. This patent is for a hybrid modulation method of PAM+PWM.

[0072] Figure 1 For the existing cascaded H-bridge topology diagram, such as Figure 1 As shown, the common topology of existing SVG, STATCOM, and energy routers is the cascaded H-bridge topology. This topology can collectively handle a very high voltage by cascading, while ensuring that the voltage of each module is not high. The specific connection method is as follows: H-bridge circuits are set on the three-phase high-voltage bus, and each branch of the H-bridge circuit is equipped with an inductor L and multiple H-bridge power units. Each H-bridge power unit also has an energy storage unit, which can be a DC-DC circuit composed of multiple switching transistors, or a bus capacitor, depending on the specific implementation scenario.

[0073] The signal is modulated using two methods: stepped wave modulation and carrier phase-shift modulation. Figure 2 Here is a schematic diagram of an existing stepped wave obtained through stepped wave modulation, such as... Figure 2 As shown, the stepped wave method uses a limited number of voltage levels and the lowest possible switching frequency to approximate a sinusoidal modulation wave. Pulse cycling is often used in stepped wave control to balance the power between modules over a long period. However, a drawback of stepped waves is that the fitted modulation wave becomes increasingly poor and its harmonic characteristics are also very poor when the number of modules is small. The voltages at each step, from the maximum to the minimum value of the stepped wave, are: 3Udc, 2Udc, Udc, 0, -Udc, -2Udc, -3Udc. Figure 3 The diagram shows an existing triangular carrier and sinusoidal modulated wave obtained through carrier phase-shift modulation, as follows: Figure 3 As shown, the carrier phase-shift modulation method generates switching signals by comparing triangular carrier waves with a sinusoidal modulation wave. Each switch has a relatively high frequency, resulting in a well-fitted modulation wave with excellent harmonic characteristics. The more modules there are, the better the harmonic characteristics become. Because the switching frequency of each module remains high, the connection time of each module is almost identical, meaning the power distribution between modules is very balanced. However, the high switching speed leads to significant switching losses. Here, the switching signal is denoted as j, which can be understood as the on / off state of the power devices in the high-frequency module and / or low-frequency module. Multiple triangular carrier waves are provided, and comparing them with the sinusoidal modulation wave yields the voltage of the switching transistors in each module, enabling the corresponding transistors to be turned on or off. In summary, stepped-wave modulation has the advantages of low switching frequency and low switching losses, while carrier phase-shift modulation has the advantage of good harmonic characteristics. Therefore, based on this, a modulation method combining stepped-wave modulation and carrier phase-shift modulation, namely PAM+PWM modulation, is proposed. PAM controls the low-frequency module, and PWM controls the high-frequency module. This modulation method, when using special components in the high-frequency module transmitting the PWM modulation signal, can simultaneously possess the advantages of good carrier phase-shift harmonics and low switching losses when using stepped-wave modulation. First, it should be noted that the module using PAM modulation is designated as the low-frequency module; the module using PWM modulation is designated as the high-frequency module; the low-frequency module is the first switching module, and the high-frequency module is the second switching module. The original modulation wave is determined based on the voltage outer loop and the current inner loop. Figure 4 A simplified topology diagram of a signal modulation circuit based on PAM+PWM provided in this application is shown below. Figure 4As shown, the first switching module consists of Q1-Q4 and additionally includes a DC-DC circuit. It should be noted that Q1-Q4 are all IGBTs from the first to the fourth IGBT. Their specific connection method is as follows: the driving terminals of the first to fourth IGBTs are used to receive driving signals that cause the first to fourth IGBTs to be in a conducting or turning-off state. The first terminal of the first IGBT is connected to the first terminal of the second IGBT, the second terminal of the first IGBT is connected to the first terminal of the third IGBT, the second terminal of the second IGBT is connected to the first terminal of the fourth IGBT, and the second terminal of the third IGBT is connected to the second terminal of the fourth IGBT. The second terminals of both the first and second IGBTs are connected to a bus. The module also includes a bus capacitor, with the first terminal of the bus capacitor connected to the first terminal of the second IGBT and the second terminal of the fourth IGBT. The DC-DC circuit is connected across the two ends of the bus capacitor.

[0074] The second switching module consists of Q5-Q8 transistors and includes an additional DC-DC circuit. It should be noted that Q5-Q8 are the fifth to eighth MOSFETs, connected as follows: the drive terminals of the fifth to eighth MOSFETs receive drive signals that turn them on or off. The first terminal of the fifth MOSFET is connected to the first terminal of the sixth MOSFET, and the second terminal of the fifth MOSFET is connected to the first terminal of the seventh MOSFET. The second terminal of the sixth MOSFET is connected to the first terminal of the eighth MOSFET, and the second terminal of the seventh MOSFET is connected to the second terminal of the eighth MOSFET. The second terminals of both the fifth and sixth MOSFETs are connected to a bus, which also includes a bus capacitor. The first terminal of the bus capacitor is connected to the first terminal of the sixth MOSFET, and the second terminal of the bus capacitor is connected to the second terminal of the eighth MOSFET. The DC-DC circuit is connected across the bus capacitor. Furthermore, both the IGBT and MOSFETs have diodes connected to their respective first and second terminals. The anode of the diode is connected to the second terminal of the switching transistor, and the cathode of the diode is connected to the first terminal of the switching transistor.

[0075] Figure 5 A DC-DC circuit diagram provided in this application, such as Figure 5As shown, the circuit contains 16 switching transistors (S1-S16), 2 Cin capacitors (Cin1-Cin2), 4 Cr capacitors (Cr1-Cr4), 4 Lr inductors (Lr1-Lr4), and 3 Cout capacitors (Cout, Cout1-Cout2). The 16 switching transistors are divided into four groups and connected in a full-bridge circuit structure, with the Cr capacitors and Lr inductors connected correspondingly. Diodes are connected to both ends of the corresponding switching transistors. The 2 Cin capacitors and 2 Cout capacitors (Cout1-Cout2) are connected sequentially to the four arms of the full-bridge circuit, with the Cout capacitors connected to the two right arms of the full-bridge circuit.

[0076] Figure 6 A flowchart of a signal modulation method based on PAM+PWM provided in this application embodiment is shown below. Figure 6 As shown, this application provides a signal modulation method based on PAM+PWM, applied to a CHB topology containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switching transistor in the second switching module is greater than the switching frequency of each switching transistor in the first switching module, comprising:

[0077] S60: Acquire the original modulated wave;

[0078] Among them, the stepped wave representing the control of the first switch module and the fan-shaped wave representing the control of the second switch module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave.

[0079] S61: The original modulated wave is horizontally reduced to obtain the first sinusoidal modulated wave;

[0080] S62: Determine whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave;

[0081] S63: When the first sinusoidal modulation wave cannot make the power corresponding to the first and second switching modules equal, the first sinusoidal modulation wave is longitudinally reduced to obtain the second sinusoidal modulation wave.

[0082] S64: Modulates according to the second sinusoidal modulation wave with the aim of jointly optimizing power balance and efficiency.

[0083] The lateral reduction of the original modulated wave specifically includes:

[0084] Under the conditions of central symmetry and a first preset requirement, the original modulated wave is horizontally reduced. The first preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulated wave does not exceed the total voltage of the second switching module, and the total power of the first switching module does not exceed a preset power value of the total power of all switching modules. The total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules.

[0085] The first sinusoidal modulated wave is longitudinally reduced, specifically including:

[0086] Based on central symmetry and a second preset requirement, the first sinusoidal modulation wave is longitudinally reduced. The second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave does not exceed the total voltage of the second switching module, and the power is balanced based on the balance between the efficiency increase and efficiency decrease when the first and second switching modules are balanced.

[0087] It should also be noted that determining whether the power of the first switching module and the second switching module is in a balanced state specifically includes:

[0088] Obtain the first power corresponding to the first switch module and the second power corresponding to the second switch module;

[0089] Determine whether the difference between the first power and the second power is within the preset power range;

[0090] If so, then it is determined that the power corresponding to the first switching module and the second switching module is in a balanced state;

[0091] If not, then it is determined that the power of the first switching module and the second switching module is not in an unbalanced state.

[0092] The following will illustrate the simplified topology of a PAM+PWM-based signal modulation circuit consisting of four low-frequency modules (first switching module) and two high-frequency modules (second switching module):

[0093] When four first switch modules and two second switch modules are set, the first switch modules are connected sequentially in the vertical direction, and the second switch modules are connected sequentially in the vertical direction. Figure 7 This is a schematic diagram of an unmodulated waveform provided in this application. Figure 8 This is a schematic diagram illustrating a lateral reduction of the original modulated wave provided in this application. Figure 9 A schematic diagram of longitudinal reduction of a first sinusoidal modulated wave provided in this application is shown below. Figures 7 to 9As shown in the diagram, the dividing line in the middle does not represent the switching of individual switches at that point; it merely divides all the steps into left and right sections. The first first switch module is labeled ①, the second ②, the third ③, and the fourth ④; hereinafter referred to as Module 1, Module 2, Module 3, and Module 4. Module 1 is the first to turn on in the lower left corner and the first to turn off in the upper right corner; Module 2 is the second to turn on and the second to turn off; Module 3 is the third to turn on and the third to turn off; and Module 4 is the fourth to turn on and the fourth to turn off. The purpose is to balance the input time of each low-frequency module as much as possible. If Module 1 is the first to turn on and the last to turn off, then the power of Module 1 will be much greater than that of the other low-frequency modules. The difference between the original modulation wave and the stepped wave is used as the fan-shaped wave of the high-frequency module, which is the blank part in the diagram. At this point, the goal of fitting the modulation wave together with the high-frequency modules is achieved. The high-frequency part uses carrier phase shifting to control the high-frequency module. Taking a first sinusoidal modulation amplitude of 8165V and a module voltage of 1800V as an example, the energy proportions of modules 1 to 4 are determined to be 20.81%, 23.70%, 23.70%, and 20.81%, respectively; the energy proportions of the two second switching modules are 5.49% and 5.49%, respectively. In an energy router, uneven load distribution can lead to increased conduction losses and increased transformer rated power, thereby increasing system costs and reducing system efficiency. Therefore, power balancing between high-frequency and low-frequency modules is essential.

[0094] The following is the power equalization control process:

[0095] Firstly, the root cause of power imbalance lies in the excessively long connection time of low-frequency modules to the network side, resulting in excessive input power. Therefore, to achieve power balance between high and low frequencies, the connection time of low-frequency modules must be shortened. This can be achieved by laterally reducing the low-frequency modulation wave. Firstly, ensuring the first modulation wave is symmetrical about the central axis, laterally reducing the original modulation wave results in: module 1 having the largest reduction in turn-on time and the smallest reduction in turn-off time; modules 2 and 3 having roughly equal reductions in turn-on and turn-off times; and module 4 having the smallest reduction in turn-on time and the largest reduction in turn-off time. Calculations show that modules 1 and 4 have significantly reduced turn-on times, while modules 2 and 3 have reduced them less. However, because modules 2 and 3 have larger currents within the reduced time range, the reduced input energy results in a greater overall power balance among the low-frequency modules. Second, the first preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulated wave should not exceed the total voltage of the second switching module, and the total power of the first switching module should not exceed the preset power value of the total power of all switching modules. The total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules. The total voltage of the second switching modules is 3600V, so this difference cannot exceed 3600V; otherwise, the purpose of controlling harmonics will be lost. The preset power value is set to 4 / 6. When the proportion reaches 4 / 6, it means that the power of the four low-frequency modules accounts for 4 / 6 of the total power, and the two high-frequency modules account for 2 / 6 of the power, thus achieving power balance between high and low frequencies. If the low-frequency modulated wave is further reduced at this point, it will continue to cause the low-frequency power to gradually decrease and the power difference to increase in the opposite direction. Secondly, if horizontal reduction cannot achieve complete power balance between the high-frequency and low-frequency modules, vertical reduction of the low-frequency modulated wave can be chosen. First, while maintaining the symmetry of the second modulation wave about the central axis, the second modulation wave is longitudinally reduced. This is manifested in module 1 having the least reduction in turn-on time and the most reduction in turn-off time; modules 2 and 3 having roughly equal reductions in turn-on and turn-off times; and module 4 having the greatest reduction in turn-on time and the least reduction in turn-off time. It is determined that modules 1 and 4 have significantly reduced turn-on times, while modules 2 and 3 have reduced them less. Furthermore, because the current is larger within the reduced time range of modules 1 and 4, the reduced input energy is even less, thus exacerbating the power imbalance between low-frequency modules. Second, the second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave should not exceed the total voltage of the second switching module. Power equalization is performed based on the condition that the efficiency increase and efficiency decrease values ​​when balancing the power of the first and second switching modules are balanced. A comprehensive consideration of both equalization methods is needed to find the most efficient solution for power equalization.Finally, the aforementioned adjustments to the low-frequency modulation wave resulted in a reduction in the low-frequency input time and power. This increased the gap between the original modulation wave and the corresponding stepped wave of the low-frequency module, meaning the high-frequency module needed to fill more space, resulting in a longer operating time and consequently increasing the input power of the high-frequency module. This achieved the goal of balancing high and low frequency power. It should also be noted that... Figure 10 A schematic diagram of the second sinusoidal modulation wave provided in this application is shown below. Figure 10 As shown, the signal protruding in the middle corresponds to the blank space on modules 1 and 4, and the signals to the left and right of this protruding signal correspond to... Figures 7 to 9 The blank spaces on the left and right sides of the text.

[0096] Based on the above embodiments, as a more preferred embodiment, after determining that the power corresponding to the first switch module and the second switch module is in a balanced state, the method further includes: outputting a first prompt message indicating that the power is in a balanced state. Simultaneously, after determining that the power corresponding to the first switch module and the second switch module is not in a balanced state, the method further includes: outputting a second prompt message indicating that the power is in a balanced state.

[0097] It should be noted that both the first and second prompts can be expressed in text or data string form. When expressed in text, they can be represented as "uneven" or "no," or "even" or "yes," etc. When expressed as data strings, the data string can be 1, 2, 4, 8 characters, etc., and can be represented in the order mentioned above as "1," "10," "1100," etc.

[0098] Regarding "00100111", it should be noted that the methods for representing the first and second prompt messages mentioned above are only a few of many embodiments and do not limit the methods for representing the first and second prompt messages. Furthermore, the data string can be converted to a decimal value, and it can be determined whether the value exceeds a preset value. If it exceeds the preset value, the first and second prompt messages can be output. Alternatively, the number of 0s and 1s in the data string can be counted; if the number of 1s is greater than the number of 0s, the first and second prompt messages can be output. It can also be determined whether the number of 0s or 1s in the data string exceeds a preset number; if it does, the first and second prompt messages can be output. The above-mentioned implementation methods do not limit the first and second prompt messages in this application, and their implementation methods can be determined according to the implementation scenario.

[0099] In the above embodiments, the signal modulation method based on PAM+PWM has been described in detail. This application also provides embodiments of a signal modulation device based on PAM+PWM. It should be noted that this application describes the embodiments of the device part from two perspectives: one is based on the functional modules, and the other is based on the hardware.

[0100] Figure 11 A structural diagram of a signal modulation device based on PAM+PWM provided in an embodiment of this application is shown below. Figure 11 As shown, this application also provides a signal modulation device based on PAM+PWM, applied to a CHB topology containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switching transistor in the second switching module is greater than the switching frequency of each switching transistor in the first switching module, comprising:

[0101] The first acquisition module 110 is used to acquire the original modulation wave, wherein the stepped wave representing the control of the first switching module and the fan-shaped wave representing the control of the second switching module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave.

[0102] The first transverse reduction module 111 is used to transversely reduce the original modulated wave to obtain the first sinusoidal modulated wave.

[0103] The first determining module 112 is used to determine whether the power corresponding to the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave.

[0104] The first longitudinal reduction module 113 is used to longitudinally reduce the first sinusoidal modulation wave to obtain the second sinusoidal modulation wave when the power corresponding to the first and second switching modules cannot be balanced according to the first sinusoidal modulation wave.

[0105] Modulation module 114 is used to modulate according to a second sinusoidal modulation wave for the purpose of jointly optimizing power equalization and efficiency.

[0106] In addition, the device also includes the following modules:

[0107] Preferably, the lateral reduction of the original modulated wave includes:

[0108] The second lateral reduction module is used to laterally reduce the original modulated wave under the conditions of central symmetry and a first preset requirement. The first preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulated wave does not exceed the total voltage of the second switching module, and the total power of the first switching module does not exceed a preset power value of the total power of all switching modules. The total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules.

[0109] Preferably, longitudinal reduction of the first sinusoidal modulated wave includes:

[0110] The second longitudinal reduction module is used to longitudinally reduce the first sinusoidal modulation wave under the conditions of central symmetry and a second preset requirement. The second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave does not exceed the total voltage of the second switching module, and the power is balanced under the condition that the efficiency increase and efficiency decrease values ​​when the first and second switching modules are balanced.

[0111] Preferably, determining whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave includes:

[0112] The second acquisition module is used to acquire the first power corresponding to the first switch module and the second power corresponding to the second switch module;

[0113] The judgment module is used to determine whether the difference between the first power and the second power is within a preset power range;

[0114] If so, the second determination module is triggered to determine that the power of the first switching module and the second switching module is in a balanced state.

[0115] If not, the third determination module is triggered to determine that the power of the first and second switching modules is not in an unbalanced state.

[0116] Preferably, obtaining the original modulated wave includes:

[0117] The fourth determination module is used to determine the original modulation wave based on the voltage outer loop and the current inner loop.

[0118] Preferably, after determining that the power corresponding to the first switching module and the second switching module is in a balanced state, the method further includes:

[0119] The first output module is used to output a first prompt message indicating that the power is in a balanced state.

[0120] Preferably, after determining that the power corresponding to the first switching module and the second switching module is not in an unbalanced state, the method further includes:

[0121] The second output module is used to output a second prompt message indicating that the power is in a balanced state.

[0122] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0123] Figure 12A structural diagram of a signal modulation device based on PAM+PWM provided in this application embodiment is shown below. Figure 12 As shown, a signal modulation device based on PAM+PWM includes:

[0124] Memory 120 is used to store computer programs;

[0125] The processor 121 is used to implement the steps of the PAM+PWM-based signal modulation method mentioned in the above embodiments when executing a computer program.

[0126] The PAM+PWM-based signal modulation device provided in this embodiment can include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0127] The processor 121 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 121 may be implemented using at least one hardware form selected from Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 121 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 121 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 121 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0128] The memory 120 may include one or more computer-readable storage media, which may be non-transitory. The memory 120 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 120 is used to store at least the following computer program, which, after being loaded and executed by the processor 121, is capable of implementing the relevant steps of the PAM+PWM-based signal modulation method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 120 may also include an operating system and data, and the storage method may be temporary or permanent. The operating system may include Windows, Unix, Linux, etc. The data may include, but is not limited to, the PAM+PWM-based signal modulation method.

[0129] In some embodiments, the PAM+PWM-based signal modulation device may further include a display screen, input / output interfaces, communication interfaces, a power supply, and a communication bus.

[0130] Those skilled in the art will understand that Figure 12 The structure shown does not constitute a limitation on PAM+PWM based signal modulation devices and may include more or fewer components than shown.

[0131] The signal modulation device based on PAM+PWM provided in this application includes a memory 120 and a processor 121. When the processor 121 executes the program stored in the memory 120, it can implement the signal modulation method based on PAM+PWM.

[0132] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0133] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0134] The foregoing provides a detailed description of the PAM+PWM-based signal modulation method, apparatus, device, and medium provided in this application. The various embodiments are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0135] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A signal modulation method based on PAM+PWM, characterized in that, A CHB topology is applied to a structure containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switch in the second switching module is greater than the switching frequency of each switch in the first switching module, wherein the low-frequency switching module is the first switching module and the high-frequency switching module is the second switching module, comprising: Obtain the original modulation wave, wherein the stepped wave representing the control of the first switch module and the fan-shaped wave representing the control of the second switch module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave. The original modulated wave is laterally reduced to obtain the first sinusoidal modulated wave; Determine whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave; When the first sinusoidal modulation wave cannot bring the power of the first switching module and the second switching module into a balanced state, the first sinusoidal modulation wave is longitudinally reduced to obtain the second sinusoidal modulation wave. With the aim of jointly optimizing power balance and efficiency, modulation is performed based on the second sinusoidal modulation wave.

2. The signal modulation method based on PAM+PWM according to claim 1, characterized in that, The lateral reduction of the original modulated wave includes: Under the conditions of central symmetry and a first preset requirement, the original modulated wave is laterally reduced, wherein the first preset requirement is: the difference between the total voltage of the first switching module and the amplitude of the original modulated wave does not exceed the total voltage of the second switching module, and the total power of the first switching module does not exceed a preset power value of the total power of all switching modules, wherein the total power of all switching modules is the sum of the power of multiple first switching modules and the power of multiple second switching modules.

3. The signal modulation method based on PAM+PWM according to claim 1, characterized in that, The longitudinal reduction of the first sinusoidal modulated wave includes: Based on central symmetry and a second preset requirement, the first sinusoidal modulation wave is longitudinally reduced. The second preset requirement is that the difference between the total voltage of the first switching module and the amplitude of the original modulation wave does not exceed the total voltage of the second switching module, and the power is balanced based on the balance between the efficiency increase and efficiency decrease when the first and second switching modules are balanced.

4. The signal modulation method based on PAM+PWM according to claim 1, characterized in that, The step of determining whether the power of the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave includes: Obtain the first power corresponding to the first switch module and the second power corresponding to the second switch module; Determine whether the difference between the first power and the second power is within a preset power range; If so, then it is determined that the power corresponding to the first switching module and the second switching module is in the balanced state; If not, then it is determined that the power corresponding to the first switch module and the second switch module is not in the balanced state.

5. The signal modulation method based on PAM+PWM according to claim 1, characterized in that, The acquisition of the original modulated wave includes: The original modulation wave is determined based on the outer voltage loop and the inner current loop.

6. The signal modulation method based on PAM+PWM according to claim 4, characterized in that, After determining that the power corresponding to the first switching module and the second switching module is in the balanced state, the method further includes: Output a first prompt message indicating that the power is in the balanced state.

7. The signal modulation method based on PAM+PWM according to claim 4, characterized in that, After determining that the power corresponding to the first switching module and the second switching module is not in the balanced state, the method further includes: Output a second prompt message indicating that the power is in the balanced state.

8. A signal modulation device based on PAM+PWM, characterized in that, A CHB topology is applied to a structure containing multiple first switching modules and multiple second switching modules, wherein the switching frequency of each switch in the second switching module is greater than the switching frequency of each switch in the first switching module, wherein the low-frequency switching module is the first switching module and the high-frequency switching module is the second switching module, comprising: The first acquisition module is used to acquire the original modulation wave, wherein the stepped wave representing the control of the first switching module and the fan-shaped wave representing the control of the second switching module are both generated based on the original modulation wave, wherein the fan-shaped wave is the difference between the original modulation wave and the stepped wave. The first lateral reduction module is used to laterally reduce the original modulated wave to obtain the first sinusoidal modulated wave. The first determining module is used to determine whether the power corresponding to the first switching module and the second switching module is in a balanced state based on the first sinusoidal modulation wave. The first longitudinal reduction module is used to longitudinally reduce the first sinusoidal modulation wave to obtain a second sinusoidal modulation wave when the first sinusoidal modulation wave cannot make the power corresponding to the first switching module and the second switching module equal. The modulation module is used to modulate the second sinusoidal modulation wave for the purpose of jointly optimizing power equalization and efficiency.

9. A signal modulation device based on PAM+PWM, characterized in that, include: Memory, used to store computer programs; A processor, configured to implement the steps of the PAM+PWM-based signal modulation method as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the PAM+PWM-based signal modulation method as described in any one of claims 1 to 7.

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