A power information coordinated modulation method based on step-down DC converter

Abstract

The present invention discloses a power information cooperative modulation method based on a buck DC converter, and relates to the technical field of power information cooperative modulation. The present invention combines the structural characteristics of the three-phase staggered parallel buck DC converter itself to perform power information cooperative modulation, utilizes the inherent phase relationship of the three-phase staggered 120° of the three-phase staggered parallel buck DC converter, and changes the amplitude and phase characteristics of the output voltage ripple by adjusting the carrier phase offset to achieve information coding modulation. The present invention realizes the unification of phase-shift keying switching frequency, improves the performance of power transmission and information interaction, and the ripple amplitude fluctuation range is small. When multiple converters are operated in parallel, the converter in the non-communication state can avoid interference with the information demodulation of the communication end converter because the ripple amplitude approaches zero, and there is no need to adopt an orthogonal switching frequency switching strategy, which effectively reduces the system complexity and improves applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of power information coordinated modulation, and in particular to a power information coordinated modulation method based on a step-down DC converter. Background Art

[0002] Currently, Power Signal Dual Modulation (PSDM) combines information transmission with power modulation by injecting information into a carrier or reference wave. The information is also modulated into a pulse-width modulation (PWM) waveform. After power demodulation by the converter filter, the information is transferred to the output voltage ripple, allowing the original converter ripple to carry the information.

[0003] Current power information cooperative modulation technology is primarily targeted at basic DC-DC converter topologies, such as boost and buck converters. Existing power information cooperative modulation methods are used in simple DC-DC converters, using modulation methods such as phase shift keying (PSK), frequency shift keying (FSK), and amplitude shift keying (ASK).

[0004] However, when using PSK or FSK, dynamic frequency modulation (hopping to orthogonal frequencies) is required to mitigate ripple interference in parallel scenarios involving multiple converters. This results in discrete switching frequencies, increasing the complexity and cost of filter circuit design. Existing methods also use output ripple as the information carrier and fail to actively suppress ripple during the modulation process. Encoding the information code "1" requires artificially increasing the ripple amplitude. For example, ASK achieves encoding by periodically switching the duty cycle, which increases the ripple amplitude fluctuation range and degrades power quality.

[0005] In summary, the existing power information cooperative modulation method has a large ripple amplitude fluctuation range and is less applicable in multi-converter parallel scenarios. Summary of the Invention

[0006] Based on this, it is necessary to provide a power information coordinated modulation method based on a step-down DC converter to address the above technical problems.

[0007] The present invention adopts the following technical solutions:

[0008] The present invention provides a power information collaborative modulation method based on a buck-type DC converter. The buck-type DC converter is a three-phase interleaved parallel buck-type DC converter, which includes three parallel Buck circuits. The present invention first represents the information to be transmitted through four different information codes, and then controls the switching tubes of the three Buck circuits to achieve power conversion and simultaneous transmission of the information to be transmitted. The initial phase of the carrier of the first Buck circuit is maintained at 0°, the initial phase of the carrier of the second Buck circuit is switched between 120° and 0°, and the initial phase of the carrier of the third Buck circuit is switched between 240° and 0°, so as to modulate the four different information codes into the output voltage ripple of the three-phase interleaved parallel buck-type DC converter.

[0009] The present invention provides a power information coordinated modulation device based on a step-down DC converter, comprising:

[0010] An encoding module, used to represent the information to be transmitted through four different information encodings;

[0011] The control module is used to control the three Buck circuit switches to achieve power conversion and transmit the information to be transmitted at the same time;

[0012] The three-phase interleaved parallel buck DC converter is used to maintain the initial phase of the carrier of the first Buck circuit at 0°, switch the initial phase of the carrier of the second Buck circuit between 120° and 0°, and switch the initial phase of the carrier of the third Buck circuit between 240° and 0° under the control of the control module, so as to modulate four different information codes into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0013] At least one of the above technical solutions adopted by the present invention can achieve the following beneficial effects:

[0014] The present invention combines the structural characteristics of the three-phase interleaved parallel buck DC converter to perform power information collaborative modulation, utilizes the inherent phase relationship of the three-phase interleaved 120° of the three-phase of the three-phase interleaved parallel buck DC converter, and changes the amplitude and phase characteristics of the output voltage ripple by adjusting the carrier phase offset to achieve information coding modulation.

[0015] Compared with traditional power information cooperative modulation applications that use ripple to transmit information, when the present invention transmits the default information code in the default state, the ripple superposition effect under the three-phase staggered 120° working condition greatly reduces its amplitude. When transmitting other information symbols, the phase of any phase carrier is switched to break the phase cooperative balance, increase the total ripple amplitude, and change the fundamental frequency phase, so as to perform information modulation, realize the unification of phase shift keying switching frequency, improve the performance of power transmission and information interaction, and the ripple amplitude fluctuation range is small.

[0016] When multiple converters operate in parallel, the ripple amplitude of the converter in the non-communication state approaches zero, which can avoid interference with the information demodulation of the converter at the communication end. There is no need to adopt an orthogonal switching frequency switching strategy, which effectively reduces the system complexity and improves applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic flow chart of a power information coordinated modulation method based on a step-down DC converter provided by the present invention;

[0019] Figure 2 A schematic diagram of a topological structure of a three-phase interleaved parallel buck DC converter provided by the present invention;

[0020] Figure 3 A schematic diagram of a three-phase 120° staggered drive waveform and a three-phase inductor current waveform provided by the present invention;

[0021] Figure 4 A schematic diagram of a three-phase non-staggered 120° drive waveform and a three-phase inductor current waveform provided by the present invention;

[0022] Figure 5 The present invention provides a schematic diagram of an information demodulation process. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Currently, existing solutions rely directly on the converter's inherent ripple as an information carrier. For example, using ASK modulation to encode the information "1" requires artificially increasing the ripple amplitude, resulting in a wide range of ripple fluctuations. Furthermore, to enable independent information transmission in parallel across multiple buck converters, existing PSK or FSK modulation schemes must switch to orthogonal frequencies to prevent interference from ripple from other converters.

[0025] The present invention proposes a ripple-information cooperative modulation method based on a three-phase interleaved parallel Buck converter, which uses a three-phase interleaved phase of 120° to reduce the ripple size, and uses the ripple amplitude size for demodulation. When transmitting the default information code "0", the ripple superposition effect under the three-phase interleaved 120° working condition greatly reduces its amplitude. When transmitting other information codes, the phase of any one phase of the carrier is switched to break the phase cooperative balance, causing the total ripple amplitude to increase sharply and the baseband phase to change, thereby performing information demodulation, realizing the unification of the phase shift keying switching frequency, simplifying the filtering and conditioning circuit, and improving the performance of power transmission and information interaction.

[0026] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Figure 1 The present invention is a schematic flow chart of a power information coordinated modulation method based on a step-down DC converter. The step-down DC converter is a three-phase interleaved parallel step-down DC converter. The method specifically includes the following steps:

[0028] S101: The information to be transmitted is represented by four different information codes.

[0029] S102: By controlling the three Buck circuit switch tubes, power conversion is achieved while transmitting the information to be transmitted.

[0030] The present invention is based on the three-phase interleaved buck converter (3P-IBC) to carry out power information coordinated modulation. Figure 2 This is a schematic diagram of a three-phase interleaved parallel buck DC converter topology structure in the present invention, consisting of Figure 2 As can be seen, it comprises three parallel buck circuits. The conduction phases of the switching transistors in each phase of the buck circuit are 120° apart. This staggered control method effectively reduces output voltage and current ripple, reduces the size of the filter inductor and capacitor, and significantly improves power density. Furthermore, because the three phases are connected in parallel, each phase only needs to carry one-third of the total current, reducing the current stress requirements of the switching devices.

[0031] The present invention first models the information modulation of the three-phase staggered parallel buck DC converter, for example, with a duty cycle D =0.5 as an example, when the PWM waveform of 3P-IBC is staggered by 120°, the driving waveform and the three-phase inductor current waveform are as follows Figure 3 As shown, Figure 3 Schematic diagram of a three-phase 120° staggered drive waveform and a three-phase inductor current waveform in the present invention.

[0032] The first Buck circuit is branch 1, the second Buck circuit is branch 2, and the third Buck circuit is branch 3. The PWM waveform of branch 1 is: d 1. The PWM waveform of branch 2 is d 2. The PWM waveform of branch three is d 3. The current flowing through branch 1 is i L1 , the current flowing through branch 2 is i L2 , the current flowing through branch 3 is i L3 , the sum of the three branches is i L When the PWM signals of the three-phase branches are staggered by 120°, the inductor current waveform is as follows: Figure 3 As shown. t for t 0 ~t In period 1, the three-phase inductor voltage expression is:

[0033] .

[0034] Where, is the input voltage of the Buck circuit, is the output voltage of the Buck circuit, is the inductance value of branch 1, is the inductance value of branch 2, is the inductance value of branch 3.

[0035] According to the relationship between the output voltage and input voltage of the Buck circuit: , where is the main switch closing time, is the switching period of the main switch. Based on this, the inductor current output ripple can be obtained by transforming the above formula:

[0036] .

[0037] Where, The current flowing through the inductor under three-phase interleaving L 1 peak-to-peak current ripple, The current flowing through the inductor under three-phase interleaving L 2 The peak-to-peak current ripple, The current flowing through the inductor under three-phase interleaving L 3. The peak-to-peak current ripple.

[0038] According to the KCL theorem, and L 1= L 2= L 3= L The total peak-to-peak current ripple can be deduced as:

[0039] .

[0040] Where, It is the total current ripple peak-to-peak value under three-phase interleaving.

[0041] When the PWM waveform of 3P-IBC is not interleaved, the inductor current waveform is as follows: Figure 4 As shown, Figure 4 Schematic diagram of a three-phase non-staggered 120° driving waveform and a three-phase inductor current waveform in the present invention.

[0042] when t for t 0~ t In period 1, the three-phase inductor voltage expression is:

[0043] .

[0044] Similarly, based on the relationship between the output voltage and input voltage of the Buck circuit, the inductor current output ripple can be obtained by transforming the above formula:

[0045] .

[0046] Where, The three-phase non-interleaved current flows through the inductor L 1 peak-to-peak current, The three-phase non-interleaved current flows through the inductor L 2The peak-to-peak current, The three-phase non-interleaved current flows through the inductor L 3 peak-to-peak current.

[0047] According to the KCL theorem, the total current ripple peak-to-peak value can be deduced as:

[0048] .

[0049] Where, It is the total current ripple peak-to-peak value when the three phases are not interleaved.

[0050] Comparing the ripple size of three-phase interleaving and three-phase non-interleaving, , in order to perform information modulation, when the information code "0" is transmitted, the three phases are staggered by 120°. When the information code other than "0" is transmitted (assuming that the phase of the three-phase PWM control signal is 0°, 0°, 0°, corresponding to the information code "3"), the three phases are not staggered, so the ripple amplitude becomes larger. The increased ripple amplitude can be identified to demodulate the information in the ripple.

[0051] Similarly, when the phase of the three-phase PWM control signal is 0°, 120°, 0° or 0°, 0°, 240°, the ripple amplitude is: .

[0052] Therefore, information modulation modeling is performed and the phase switching of the three-phase branch PWM signal is shown in Table 1. Table 1 is a schematic table of PWM phases corresponding to an information encoding in the present invention.

[0053] Table 1 PWM phase corresponding to information encoding

[0054]

[0055] Based on the information modulation modeling process, the power information coordinated modulation method based on a step-down DC converter proposed in the present invention can be further derived. The information to be transmitted is first represented using four different information codes. Then, by controlling the switches of three Buck circuits, power conversion is achieved while simultaneously transmitting the information to be transmitted. The initial carrier phase of the first Buck circuit is maintained at 0°, the initial carrier phase of the second Buck circuit is switched between 120° and 0°, and the initial carrier phase of the third Buck circuit is switched between 240° and 0°, so as to modulate the four different information codes into the output voltage ripple of the three-phase interleaved parallel buck DC converter. Representing the information to be transmitted using four different information codes does not mean that each piece of information to be transmitted must be represented using all four information codes; four or fewer information codes may be used. The specific number of information codes used for each piece of information to be transmitted can be determined based on the specific content of the information to be transmitted and the coding dictionary used, and the present invention does not impose any limitations on this.

[0056] Based on Table 1 above, in one or more embodiments of the present invention, four different information codes may include: information code “0”, information code “1”, information code “2” and information code “3”.

[0057] When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 120°, and the initial phase of the carrier of the third Buck circuit is 240°, the information code "0" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0058] When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 0°, and the initial phase of the carrier of the third Buck circuit is 0°, the information code "3" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0059] When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 120°, and the initial phase of the carrier of the third Buck circuit is 0°, the information code "1" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0060] When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 0°, and the initial phase of the carrier of the third Buck circuit is 240°, the information code "2" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0061] Furthermore, in one or more embodiments of the present invention, the four information codes "0," "1," "2," and "3" can be represented in computer binary code using two binary digits, namely "00," "01," "10," and "11," respectively. Of course, more binary digits can be used for representation, and the present invention is not limited thereto.

[0062] Based on the above information modulation process, information demodulation modeling is then performed. Before signal judgment, the signal must first pass through a signal conditioning circuit to condition the output voltage of the three-phase interleaved parallel buck DC converter on the bus into a sinusoidal fundamental wave with appropriate DC bias that carries the information. The signal conditioning circuit design should first use a capacitor to block the DC current, leaving only the ripple. Due to the small amplitude of the ripple, it needs to pass through a signal amplifier and then perform bandpass filtering to obtain an amplified sinusoidal signal that carries the switching frequency of the information.

[0063] Analysis of information modulation modeling reveals that when the transmitted information codes are "0" and "3," the ripple amplitudes are different, and differ from those of "1" and "2." Therefore, amplitude demodulation can be used to distinguish the two. However, for information codes "1" and "2," the ripple amplitudes are identical, making amplitude demodulation prone to confusion. Therefore, phase demodulation is combined with this approach. The following modeling is used to demodulate the four information codes.

[0064] Demodulation principle Figure 5 As shown, Figure 5 The figure is a schematic diagram of an information demodulation process in the present invention. The conditioned signal is demodulated by amplitude and phase coherence respectively.

[0065] Specifically, in one or more embodiments of the present invention, the information receiver may first receive the output voltage of a three-phase interleaved parallel step-down DC converter, filter out the DC portion of the output voltage through a capacitor to obtain a ripple signal, then amplify and filter the ripple signal through a signal amplifier and a bandpass filter to obtain a switching frequency baseband signal carrying information coding, then perform amplitude extraction and judgment on the switching frequency baseband signal through an amplitude extractor and a judger to obtain first modulation information, and coherently demodulate the switching frequency baseband signal through a phase coherent demodulator to obtain second modulation information. Finally, the first modulation information and the second modulation information may be added to obtain the transmitted information coding.

[0066] For example, an amplitude extractor first samples the base signal every 2 microseconds within a switching frequency cycle. The maximum value, the amplitude of the baseband signal, is then compared and extracted, and passed through a discriminator. Because the amplitude of the baseband signal transmitting the information code "3" is much greater than that transmitting the information code "0," the information codes "0" and "3" can be demodulated. Because the ripple voltage waveforms when transmitting the information codes "1" and "2" are mirror-symmetric within a switching cycle, the conditioned signal is passed through a phase-coherent demodulator to obtain the information codes "1" and "2." Amplitude demodulation and coherent demodulation are performed simultaneously, and the demodulated results are finally added together to obtain the transmitted information code.

[0067] In conjunction with the information modulation and demodulation process of the information sender and the information receiver, the present invention also provides a modulation and demodulation implementation method of the information sender and the information receiver, including:

[0068] Step 1: The sender represents the information to be transmitted using four different information codes. Continuing with the example of representing four information codes using two binary codes, the three Buck circuit switches are controlled to maintain the initial carrier phase of branch 1 of the 3P-IBC at 0°. The initial carrier phase of branch 2 switches between 120° and 0°, representing the high-order information 0 and 1. The initial carrier phase of branch 3 switches between 240° and 0°, representing the low-order information 0 and 1. This achieves 3P-IBC power conversion while modulating the four information codes (0, 1, 2, and 3) into the output voltage ripple.

[0069] Step 2: The information receiver conditions the output voltage waveform of the 3P-IBC by first filtering out the DC with a capacitor, then passing it through a signal amplifier and a bandpass filter to obtain the switching frequency baseband signal that carries the information encoding.

[0070] Step 3: The information receiver inputs the conditioned switching frequency baseband signal into the amplitude extractor and the judger to obtain the first conditioned information corresponding to the information code "0" or "3".

[0071] Step 4: The information receiver passes the conditioned switching frequency baseband signal through a phase coherent demodulator to obtain second conditioned information corresponding to the information code "1" or "2".

[0072] Step 5: The information receiver adds the first modulation information and the second modulation information demodulated by the two conditioners to obtain the final information code, thereby realizing the power information coordinated modulation of 3P-IBC.

[0073] based on Figure 1 The power information collaborative modulation method based on the buck DC converter shown in the figure combines the structural characteristics of the three-phase interleaved parallel buck DC converter itself to perform power information collaborative modulation, utilizes the inherent phase relationship of the three-phase interleaved parallel buck DC converter with 120° interleaving of the three phases, and changes the amplitude and phase characteristics of the output voltage ripple by adjusting the carrier phase offset to realize modulation and demodulation of information coding.

[0074] Compared with traditional power information cooperative modulation applications that use ripple to transmit information, when the present invention transmits the default information code in the default state, the ripple superposition effect under the three-phase staggered 120° working condition greatly reduces its amplitude. When transmitting other information symbols, the phase of any phase carrier is switched to break the phase cooperative balance, increase the total ripple amplitude, and change the fundamental frequency phase, so as to perform information modulation and demodulation, realize the unification of phase shift keying switching frequency, improve the performance of power transmission and information interaction, and the ripple amplitude fluctuation range is small.

[0075] When multiple converters operate in parallel, the ripple amplitude of the converter in the non-communication state approaches zero, which can avoid interference with the information demodulation of the converter at the communication end. There is no need to adopt an orthogonal switching frequency switching strategy, which effectively reduces the system complexity and improves applicability.

[0076] When applying the power information coordinated modulation method based on the step-down DC converter provided by the present invention, it is not necessary to Figure 1 The steps are executed in the order shown. The specific execution order of the steps can be determined according to needs, and the present invention does not limit this.

[0077] The above is a power information coordinated modulation method based on a step-down DC converter provided in one or more embodiments of the present invention. Based on the same idea, the present invention also provides a corresponding power information coordinated modulation device based on a step-down DC converter, which is applied to the information sender. The device includes:

[0078] An encoding module, used to represent the information to be transmitted through four different information encodings;

[0079] The control module is used to control the three Buck circuit switches to achieve power conversion and transmit the information to be transmitted at the same time;

[0080] The three-phase interleaved parallel buck DC converter is used to maintain the initial phase of the carrier of the first Buck circuit at 0°, switch the initial phase of the carrier of the second Buck circuit between 120° and 0°, and switch the initial phase of the carrier of the third Buck circuit between 240° and 0° under the control of the control module, so as to modulate four different information codes into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

[0081] Based on the same idea, the present invention also provides a corresponding power information cooperative modulation device based on a step-down DC converter, which is applied to the information receiving side. The device includes: a capacitor, a signal amplifier, a bandpass filter, an amplitude extractor, a judger, a phase coherent demodulator and an addition module;

[0082] The capacitor, the signal amplifier, and the input end of the bandpass filter are sequentially connected in series, the first output end of the bandpass filter is sequentially connected to the input end of the amplitude extractor and the judger, the second output end of the bandpass filter is connected to the input end of the phase coherent demodulator, and the output end of the judger and the output end of the phase coherent demodulator are respectively connected to the two input ends of the adding module;

[0083] The capacitor is used to receive the output voltage of the three-phase staggered parallel buck DC converter, filter out the DC part of the output voltage, and obtain a ripple signal;

[0084] The signal amplifier and bandpass filter are used to amplify and filter the ripple signal to obtain a switching frequency baseband signal carrying information coding;

[0085] The amplitude extractor and the judger are used to extract and judge the amplitude of the switching frequency fundamental frequency signal to obtain the first adjustment information;

[0086] The phase coherent demodulator is used to coherently demodulate the switching frequency baseband signal to obtain second modulation information;

[0087] The adding module is used to add the first mediation information and the second mediation information to obtain the transmitted information code.

[0088] Regarding the specific limitations of the power information collaborative modulation device based on a step-down DC converter, please refer to the limitations of the power information collaborative modulation method based on a step-down DC converter above, which will not be repeated here. Each module in the above-mentioned power information collaborative modulation device based on a step-down DC converter can be implemented in whole or in part by software, hardware, and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0089] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware using a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes in the above-described method embodiments. Any reference to memory, storage, database, or other media used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0090] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present invention.

Claims

1. A power information coordinated modulation method based on a step-down DC converter, characterized in that: The step-down DC converter is a three-phase interleaved parallel step-down DC converter, which includes three Buck circuits connected in parallel; the method includes: The information to be transmitted is represented by four different information codes; By controlling the three Buck circuit switches, power conversion is achieved while information is being transmitted. The carrier initial phase of the first Buck circuit is maintained at 0°, the carrier initial phase of the second Buck circuit is switched between 120° and 0°, and the carrier initial phase of the third Buck circuit is switched between 240° and 0°, so as to modulate four different information codes into the output voltage ripple of the three-phase interleaved parallel buck DC converter; The method further comprises: The information receiver receives the output voltage of the three-phase interleaved parallel buck DC converter, filters out the DC part of the output voltage through a capacitor, and obtains a ripple signal; The information receiver amplifies and filters the ripple signal through a signal amplifier and a bandpass filter to obtain a switching frequency baseband signal carrying information coding; The information receiving party extracts and judges the amplitude of the switching frequency baseband signal through the amplitude extractor and the judger to obtain the first modulation information; the information receiving party coherently demodulates the switching frequency baseband signal through the phase coherent demodulator to obtain the second modulation information; The information receiver adds the first mediation information and the second mediation information to obtain the transmitted information code.

2. The power information coordinated modulation method based on a step-down DC converter according to claim 1, characterized in that: The four different information codes include: information code "0", information code "1", information code "2" and information code "3"; When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 120°, and the initial phase of the carrier of the third Buck circuit is 240°, the information code "0" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter; When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 0°, and the initial phase of the carrier of the third Buck circuit is 0°, the information code "3" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter; When the initial phase of the carrier of the first Buck circuit is 0°, the initial phase of the carrier of the second Buck circuit is 120°, and the initial phase of the carrier of the third Buck circuit is 0°, the information code "1" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter; When the initial carrier phase of the first Buck circuit is 0°, the initial carrier phase of the second Buck circuit is 0°, and the initial carrier phase of the third Buck circuit is 240°, the information code "2" is modulated into the output voltage ripple of the three-phase interleaved parallel buck DC converter.

3. A power information coordinated modulation device, characterized in that: include: An encoding module, used to represent the information to be transmitted through four different information encodings; The control module is used to control the three Buck circuit switches to achieve power conversion and transmit the information to be transmitted at the same time; A three-phase interleaved parallel buck DC converter is configured to maintain an initial carrier phase of a first Buck circuit at 0°, switch an initial carrier phase of a second Buck circuit between 120° and 0°, and switch an initial carrier phase of a third Buck circuit between 240° and 0° under the control of a control module, so as to modulate four different information codes into an output voltage ripple of the three-phase interleaved parallel buck DC converter; It also includes: a capacitor, a signal amplifier, a bandpass filter, an amplitude extractor, a judger, a phase coherent demodulator and an adding module; The capacitor, the signal amplifier, and the input end of the bandpass filter are sequentially connected in series, the first output end of the bandpass filter is sequentially connected to the input end of the amplitude extractor and the judger, the second output end of the bandpass filter is connected to the input end of the phase coherent demodulator, and the output end of the judger and the output end of the phase coherent demodulator are respectively connected to the two input ends of the adding module; The capacitor is used to receive the output voltage of the three-phase staggered parallel buck DC converter, filter out the DC part of the output voltage, and obtain a ripple signal; The signal amplifier and bandpass filter are used to amplify and filter the ripple signal to obtain a switching frequency baseband signal carrying information coding; The amplitude extractor and the judger are used to extract and judge the amplitude of the switching frequency fundamental frequency signal to obtain the first adjustment information; The phase coherent demodulator is used to coherently demodulate the switching frequency baseband signal to obtain second modulation information; The adding module is used to add the first mediation information and the second mediation information to obtain the transmitted information code.

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