Power information dual-modulation method based on high-frequency harmonic amplitude modulation

Abstract

The invention discloses a power information dual-modulation method of an isolated DC-DC converter based on high-frequency harmonic amplitude modulation, and belongs to the technical field of power generation, power transformation or power distribution. The method is realized based on the design idea of complete separation of high-frequency carrier waves and fundamental wave frequency bands. The method comprises the following steps: firstly, modulating the waveform of an alternating current output voltage at a sending side, and performing ASK on a high-frequency harmonic wave carrying information to realize broadband information transmission and improve the channel capacity; the signal is amplified through the resonance network of the magnetic cavity, so that the signal-to-noise ratio is high, the detection is easy, and the quality of the output voltage is not influenced; and finally, information is demodulated by collecting the oscillation amplitude of the high-frequency alternating-current voltage at the receiving side. According to the method, each communication only needs one switching period, and the communication rate is improved compared with a traditional method; and flexible high-frequency signal amplitude modulation is supported, multi-system modulation is easy to realize, a plurality of bits can be transmitted in each communication, the output quality of direct-current voltage and the design of an isolation transformer are hardly influenced, and the integrity of power design is ensured.

Description

Technical Field

[0001] The invention relates to power electronics technology, and specifically discloses a power information dual modulation method of an isolated DC-DC converter based on high-frequency harmonic amplitude modulation, belonging to the technical field of power generation, power transformation or power distribution. Background Art

[0002] In order to achieve efficient energy conversion and system optimization, power electronics technology has been widely used worldwide. This technology realizes power conversion by controlling switching devices, and can flexibly apply DC links in systems containing different AC / DC sources and loads, thereby improving the efficiency and reliability of the system. Due to the electrical isolation characteristics of DC-DC converters, optical fiber or wireless communication is often required, which increases costs and failure risks. Talkative Power Converter (TPC) technology provides a cost-effective communication solution, which reuses power channels as channels and can significantly reduce additional communication costs. However, the frequency shift keying (FSK) and phase shift keying (PSK) used by existing TPC are difficult to achieve high-speed delay-free communication. The frequency of its information carrier is close to the power baseband and its intensity is weak, so its signal-to-noise ratio is low, which limits the channel capacity. The extraction of signals often relies on sliding Fourier decomposition, sampling and analyzing harmonics in multiple cycles, so that one communication requires multiple switching cycles to complete. Under the limitation of efficiency, the communication rate is difficult to further increase.

[0003] Amplitude Shift Keying (ASK) is a modulation method that uses baseband digital signals to control the change of carrier amplitude. It is a multi-level ASK energy and signal transmission scheme that retains the fundamental wave transmission energy, adjusts the effective value of the inverter voltage at the transmitting end by adjusting the phase shift angle of the full-bridge inverter, transmits power and information through the transmitting coil and the receiving coil, and the voltage amplitude in the integrated power signal stream received by the receiving end corresponds to the demodulated information. On the one hand, the adjustment of the effective value of the inverter voltage corresponds to the adjustment of the fundamental wave period time scale, which has a significant impact on the transmitting coil current and the total input power, resulting in power fluctuations and affecting the load; on the other hand, the signal follows the energy to be transmitted to the receiving end through the fundamental wave, without decoupling the energy and information, and demodulates the information by collecting the current of the transmitting coil. When the current and power need to be maintained to meet the load requirements, the information cannot be transmitted, and the information jumps with power fluctuations affect the system communication reliability.

[0004] Therefore, the current TPC technology cannot meet the requirements of high-speed communication and strong anti-interference of power electronic converters. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and provide a power information dual modulation method based on high-frequency harmonic amplitude modulation. Based on the ASK modulation idea, the amplitude of the high-frequency harmonics carrying information is adjusted by adjusting the AC voltage waveform on the information sending side, and the resonant characteristics of the AC link in the isolated DC-DC converter are used to amplify the high-frequency harmonics and transmit power at the same time. The information is demodulated by collecting the high-frequency AC voltage oscillation signal on the receiving side, thereby solving the technical problems of the current TPC technology that the signal is easily interfered with and the transmission rate is low, and achieving the invention purpose of high-interference and high-speed TPC communication.

[0006] The present invention adopts the following technical solutions to achieve the above-mentioned invention object: A power information dual modulation method based on high frequency harmonic amplitude modulation is suitable for isolated DC-DC converters. The information sequence is modulated into high-frequency harmonics based on the amplitude shift keying modulation technology, and the high-frequency harmonics whose amplitude varies with the AC voltage waveform at the information sending side are obtained; While transmitting the AC voltage on the information sending side, amplifying the high-frequency harmonics whose amplitude varies with the AC voltage waveform on the information sending side, obtaining a high-frequency AC voltage oscillation signal on the information receiving side; Collect information and demodulate the high-frequency AC voltage oscillation signal on the receiving side.

[0007] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, in the process of modulating the information sequence into high-frequency harmonics based on amplitude shift keying modulation technology: a signal frequency greater than the switching frequency is selected as the carrier frequency.

[0008] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, high-frequency harmonics whose amplitude changes with the AC voltage waveform on the information sending side are obtained. Specifically, each bit information symbol is associated with the phase shift angle on the information sending side, and the phase shift angle on the information sending side is adjusted according to the information sequence.

[0009] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, while transmitting the AC voltage on the information sending side, the high-frequency harmonics whose amplitude changes with the AC voltage waveform on the information sending side are amplified, which is achieved through a component with frequency selection function.

[0010] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the component with frequency selection function is a magnetic cavity composed of an isolation transformer and an external phase-shifting inductor. The external phase-shifting inductor is connected to the secondary coil of the isolation transformer. The equivalent circuit of the isolation transformer and the magnetic cavity parasitic network composed of the external phase-shifting inductor resonate at the signal frequency.

[0011] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the equivalent circuit of the isolation transformer includes but is not limited to a three-capacitor network, which includes: an information sending side winding equivalent capacitor, an information receiving side winding equivalent capacitor, an inter-winding capacitor and a leakage inductance. The information sending side winding equivalent capacitor is connected in parallel with the primary coil of the isolation transformer, the information receiving side winding equivalent capacitor is connected in parallel with the secondary coil of the isolation transformer, the inter-winding capacitor is connected across the primary coil and the secondary coil of the isolation transformer, and the leakage inductance is connected in series with the secondary coil of the isolation transformer.

[0012] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the external phase-shifting inductor includes an inductor and a parasitic capacitor connected in parallel.

[0013] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the demodulation information of the high-frequency AC voltage oscillation signal on the information receiving side is collected, specifically: Performing signal input processing on the high-frequency AC voltage oscillation signal on the information receiving side to obtain the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side; Signal conditioning is performed on the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side, a DC voltage pulse linearly related to the amplitude of the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side is obtained, and the amplitude information of the DC voltage pulse is collected.

[0014] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the signal input processing of the high-frequency AC voltage oscillation signal on the information receiving side includes but is not limited to high-pass filtering and signal isolation.

[0015] As a further optimization scheme of the power information dual modulation method based on high-frequency harmonic amplitude modulation, the signal conditioning of the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side includes but is not limited to bandpass filtering and envelope detection.

[0016] The present invention adopts the above technical solution and has the following beneficial effects: (1) The present invention realizes for the first time the dual modulation of information energy using high-frequency harmonic amplitude shift keying. By using a high-frequency carrier that is much higher than the power frequency and the switching frequency as the information carrier, the information bandwidth and channel capacity are improved. On the information sending side, only the switching quantity needs to be adjusted to realize information injection, without the need for dedicated communication equipment and channels. The high-frequency signal is amplified by the resonant network of the magnetic cavity to obtain a high-frequency AC voltage oscillation signal on the receiving side with a high signal-to-noise ratio and easy to detect, which neither affects the quality of the output DC voltage nor the design and optimization of the isolation transformer. The amplitude of the high-frequency AC voltage vibration signal on the receiving side is collected, and the information demodulation result obtained is independent of the load demand, thereby achieving high-speed communication while not affecting the design of the power part.

[0017] (2) The present invention is based on the design concept of completely separating the high-frequency carrier and the fundamental frequency band, and uses a carrier frequency that is much higher than the switching frequency. Therefore, a lower switching frequency can be used when transmitting the same information, thereby reducing the impact of low-frequency power on the signal and improving the efficiency of the equipment. In addition, since the carrier frequency is much higher than the switching frequency, the mutual interference between the two is extremely small, which is also conducive to the design of the information filter.

[0018] (3) The present invention can easily adjust the amplitude of high-frequency harmonics for transmitting information, and can easily implement a multi-ary modulation (M-ary) strategy, so that more information can be sent in a single communication, and appropriate information strength can be used to meet communication needs.

[0019] (4) The present invention realizes for the first time that only one switching cycle is required for one communication. Compared with the traditional TPC technology which requires multiple switching cycles for one communication, Daifuku has improved the communication rate. Thanks to the high signal-to-noise ratio, the amplitude of information-related harmonics is easy to detect without the need for Fourier decomposition that requires sliding, thereby achieving instant communication, which is beneficial to improving the dynamic performance of the AC power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the waveform diagram of the amplitude frequency keying modulation signal mode.

[0021] Figure 2 It is an overall principle diagram of the dual information modulation method proposed in the present invention.

[0022] Figure 3 is the amplitude-frequency gain curve of the magnetic cavity in the embodiment of the present invention.

[0023] Figure 4 It is the magnetic cavity equivalent circuit in the embodiment of the present invention.

[0024] Figure 5 4 is a voltage waveform diagram of the transformer port to ground at the information receiving side in an embodiment of the present invention.

[0025] Figure 6It is a schematic diagram of a demodulation circuit and demodulation information in an embodiment of the present invention.

[0026] Figure 7 1 is an example diagram of dual information modulation of a dual active bridge converter in an embodiment of the present invention.

[0027] Figure 8 Schematic diagram of the transmission path of the signal in the converter in an embodiment of the present invention.

[0028] Fig. 9 This is a specific implementation of the demodulation circuit in the embodiment of the present invention.

[0029] Fig.10 It is an experimental waveform diagram verified in the embodiment of the present invention.

[0030] Fig.11 yes Fig.10 The experimental waveform shown is a local enlarged view of the first point on the horizontal axis.

[0031] Fig.12 yes Fig.10 The experimental waveform diagram shown is a local enlarged view of the second point on the horizontal axis.

[0032] Description of the numbers in the figure: C p , receiving side winding equivalent capacitance, C s , equivalent capacitance of the sending side winding, C ps , inter-winding capacitance, L leak , leakage inductance, L inc ,inductance, C inc , parasitic capacitance, C b , high-pass capacitor, T sig , signal isolation transformer, D ,diode, C q ,capacitance, Q r , switching tube. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] like Figure 1 As shown, the power information dual modulation method based on high-frequency harmonic amplitude modulation proposed in the present invention is realized by amplitude shift keying modulation information technology, using a frequency higher than the switching frequency f The frequency of 0 is f s The high-frequency carrier transmits information, then the information sequence / modulation signal "Information #1"-"Information #2" will be modulated to a frequency of f s High-frequency harmonics whose amplitude varies with the data.

[0036] like Figure 2 As shown, the information sequence is based on ASK and the frequency is f s The modulated information is a high-frequency harmonic whose amplitude changes with the information, which is included in the inverter output voltage on the information sending side. u 1. Changing the amplitude of the high-frequency harmonics requires changing the inverter output voltage on the information sending side. u 1 waveform, one way to achieve this is to adjust u 1 internal phase shift angle D 3. u The frequencies included in 1 are f s The amplitude of the high-frequency harmonics of the transmission changes at the same time. Therefore, each bit of information symbol transmitted corresponds to a specific internal phase shift angle. For example, when sending a bit "0", the internal phase shift angle of the full-bridge inverter circuit on the transmitting side is D 30 Similarly, when sending bit "k" (k is an integer greater than or equal to 0), the internal phase shift angle of the full-bridge inverter circuit on the sending side is D 3k .

[0037] Inverter AC voltage on the information sending side u 1 is a square wave with a wide frequency band, in which the switching frequency AC voltage is used for power transmission and the high-frequency harmonic AC voltage is used for information transmission. In order to amplify the signal without affecting the power, a component is required. When the signal and power pass through it, f s Inverter AC voltage on the information sending side u1With high amplitude gain, switching frequency band f 0 Information sending side inverter AC voltage u The amplitude gain of 1 is close to 1, such as Figure 3 One way to amplify the signal without affecting power transmission is to use a magnetic cavity composed of an original isolation transformer and an external phase-shifting inductor, such as Figure 4 The high-frequency transformer can be equivalent to a three-capacitor network, consisting of the receiving side winding equivalent capacitor C p , Transmitting side winding equivalent capacitance C s , inter-winding capacitance C ps and leakage inductance L leak The external phase shift inductor is composed of an inductor L inc and parasitic capacitance C inc The parasitic network of the magnetic cavity can be in the signal frequency band f s A series resonance is formed at the junction, which has the function of amplifying high-frequency harmonic AC voltage. Moreover, the gain of the magnetic cavity in the low-frequency band of the switching frequency is close to 1, taking a 1:1 turns ratio transformer as an example. When the power and signal pass through the magnetic cavity at the same time, the amplified high-frequency harmonic AC voltage signal is superimposed on the receiving side transformer port in the form of high-frequency voltage oscillation, such as Figure 5 As shown. As a result, the modulated signal is amplified into a high-frequency AC voltage oscillation that can be directly detected. The amplitude of the high-frequency AC voltage oscillation is much higher than the switching frequency, and the amplitude changes with the information.

[0038] Finally, if Figure 6 As shown, through the high-pass capacitor C b And signal isolation transformer T sig The signal input circuit and conditioning circuit composed of the above components extract the high-frequency AC voltage oscillation signal on the receiving side transformer port. u 2, and identify u 2 amplitude to demodulate information. The conditioning circuit can be composed of a bandpass filter and an envelope detection circuit. The signal demodulation process is as follows: the high-frequency AC voltage oscillation signal on the receiving side transformer port u 2 through high-pass capacitor C b Filter, and then pass through the signal isolation transformer T sig Arriving at the signal receiving side, the signal frequency is extracted through a bandpass filter f s The harmonics of u c . u cThe amplitude is related to the high-frequency AC voltage oscillation at the receiving transformer port u 2 The amplitude is linearly related and the frequency is consistent, that is, u c is the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side; then through the envelope detection circuit, u c Transformed into amplitude and u c Amplitude-dependent DC quantity u d , and collected by the analog-to-digital conversion chip u d Then demodulate it into information.

[0039] The following uses a dual active bridge circuit to transmit 2 bits of information "0-3" as an example to specifically describe the implementation of the dual modulation method of the present invention. Figure 7 As shown, the converter includes: a full-bridge inverter circuit at the transmitting side, a magnetic cavity and a full-bridge inverter circuit at the receiving side. The dual modulation method includes: information modulation, information amplification and information demodulation.

[0040] The first step is to adjust the internal phase shift angle modulation information of the full-bridge inverter on the transmitting side. Figure 7 As shown, the information is injected by the switching signal of the full-bridge inverter circuit on the sending side. The information "0-3" is firstly converted based on amplitude shift keying with a frequency of f s The high-frequency carrier is modulated to produce a modulated signal whose amplitude varies with the information. To obtain this modulated signal, the inverter AC voltage on the sending side needs to be adjusted. u 1 zero level time. u 1The waveform will change the spectrum characteristics, the frequency is f s The amplitude of the high-frequency harmonics changes as a result, thereby obtaining a modulated signal whose amplitude changes with the information in each cycle.

[0041] The second step is to amplify the modulated signal through the magnetic cavity. Figure 7 As shown, the magnetic cavity consists of a high-frequency transformer and an external phase-shifting inductor, which can be regarded as a multi-order RLC network. f s The voltage amplitude gain of the magnetic cavity represents the high-frequency AC voltage oscillation signal measured from the transformer port on the receiving side. u 2 and the voltage injected into the transformer port on the sending side u 1, which produces a higher gain at the series resonant frequency, thus having a frequency selection function. f sWhen the modulated signal is consistent, it will be amplified at the receiving side transformer port, forming a high-frequency AC voltage oscillation signal at the receiving side transformer port. u 2.

[0042] The third step is to demodulate the information by collecting the high-frequency AC voltage oscillation voltage signal at the receiving side transformer port. u 2 through the signal high pass capacitor C b And isolation transformer T sig The conditioning circuit will u The high-frequency signal contained in 2 is converted into a DC voltage pulse that is linearly related to the amplitude of the high-frequency signal, and finally the DC voltage pulse is sampled and restored to information. Specifically, the voltage to ground of the transformer port on the information receiving side is u 2 It appears as a high-frequency signal that is amplified and superimposed on a square wave, forming a high-frequency oscillation u 2. u 2In the spectrum, the signal frequency band f s Voltage relative to u 1Signal bands in the spectrum f s The voltage is significantly amplified, while the voltage of the low-frequency harmonic components used to transmit power remains almost unchanged, so the impact on power transmission is negligible.

[0043] like Figure 8 As shown, u 2 The high-frequency AC component obtained after passing through the high-pass filter capacitor and the signal isolation transformer is Fig. 9 The signal is demodulated into information after the conditioning circuit shown in FIG. Fig. 9 As shown, it consists of a second-order active bandpass filter and an envelope detection circuit. First, u 2 The high-frequency AC component obtained after the high-pass filter capacitor and the signal isolation transformer only retains the frequency of f s The signal component u c ; Next, in the envelope detection circuit, the diode D Will u c The negative half cycle is cut off and converted into a half-wave voltage and then into a capacitor C q Charging, due to capacitor C q The internal resistance is small, and its discharge time constant is large, forming a relatively stable platform in each cycle. u c Oscillation amplitude dependent DC ud Before the next cycle arrives, the switch Q r The capacitor C q Discharge. Last u d It is sampled and converted into received information based on its voltage magnitude.

[0044] According to the principle shown, a typical experimental waveform is as follows Fig.10 shown. Fig.11 and Fig.12 They are Fig.10 The first and second horizontal partial enlarged views are shown in Figure 1. Among them, CH1 is the inverter AC voltage waveform at the information sending side. u 1, CH2 is the AC voltage waveform on the information receiving side, CH3 is Fig. 9 In u 2. CH4 is Fig. 9 In u c , CH5 is Fig. 9 In u d , CH6 is the demodulated voltage output by the DAC. First, the method is verified by repeatedly sending the signal sequence "0, 1, 2, 3, 4, 5, 6, 7", each signal represents a three-bit binary code, for example, "7" represents "111". The internal phase shift angle on the low voltage side is D 30 arrive D 37 Due to the group delay of the active filter, the output voltage after filtering is u c Compared to the input voltage u 2 has a delay of about 200 ns, which is much smaller than a single switching cycle and can be ignored. The delay from the transmitter injecting information by adjusting the internal phase shift angle to being sampled by the analog-to-digital converter (ADC) is extremely small, ensuring reliable real-time communication. Although there is a certain delay when the digital-to-analog converter (DAC) outputs the demodulated signal due to the 1 MHz serial peripheral interface (SPI) communication rate and program processing time, this delay does not affect the overall performance of the proposed method.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments. The above specific embodiments and the description in the specification are only for further illustrating the principles and preparation effects of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power information dual modulation method based on high frequency harmonic amplitude modulation, suitable for isolated DC-DC converter, characterized in that: The information sequence is modulated into high-frequency harmonics based on the amplitude shift keying modulation technology, and the high-frequency harmonics whose amplitude varies with the AC voltage waveform at the information sending side are obtained; While transmitting the AC voltage on the information sending side, amplifying the high-frequency harmonics whose amplitude varies with the AC voltage waveform on the information sending side, to obtain a high-frequency AC voltage oscillation signal on the information receiving side; Collect information and demodulate the high-frequency AC voltage oscillation signal on the receiving side.

2. According to claim 1, a power information dual modulation method based on high-frequency harmonic amplitude modulation is characterized in that: In the process of modulating the information sequence into high-frequency harmonics based on the amplitude shift keying modulation technology: a signal frequency greater than the switching frequency is selected as the carrier frequency.

3. According to claim 2, a power information dual modulation method based on high-frequency harmonic amplitude modulation is characterized in that: The method of obtaining high-frequency harmonics whose amplitude varies with the AC voltage waveform at the information sending side is specifically: associating each bit information symbol with a phase shift angle within the information sending side, and adjusting the phase shift angle within the information sending side according to the information sequence.

4. According to claim 3, a power information dual modulation method based on high-frequency harmonic amplitude modulation is characterized in that: The amplification of the high-frequency harmonics whose amplitude varies with the waveform of the AC voltage on the information sending side while transmitting the AC voltage on the information sending side is achieved through a component with a frequency selection function.

5. According to claim 4, a power information dual modulation method based on high-frequency harmonic amplitude modulation is characterized in that: The component with frequency selection function is a magnetic cavity composed of an isolation transformer and an external phase-shifting inductor. The external phase-shifting inductor is connected to the secondary coil of the isolation transformer. The equivalent circuit of the isolation transformer and the magnetic cavity parasitic network composed of the external phase-shifting inductor resonate at the signal frequency.

6. According to claim 5, a power information dual modulation method based on high frequency harmonic amplitude modulation is characterized in that: The equivalent circuit of the isolation transformer includes but is not limited to a three-capacitor network, which includes: an information sending side winding equivalent capacitor, an information receiving side winding equivalent capacitor, an inter-winding capacitor and a leakage inductance. The information sending side winding equivalent capacitor is connected in parallel with the primary side coil of the isolation transformer, the information receiving side winding equivalent capacitor is connected in parallel with the secondary side coil of the isolation transformer, the inter-winding capacitor is connected across the primary side coil and the secondary side coil of the isolation transformer, and the leakage inductance is connected in series with the secondary side coil of the isolation transformer.

7. The power information dual modulation method based on high frequency harmonic amplitude modulation according to claim 6 is characterized in that: The external phase-shifting inductor includes an inductor and a parasitic capacitor connected in parallel.

8. A power information dual modulation method based on high frequency harmonic amplitude modulation according to any one of claims 1 to 7, characterized in that: The high-frequency AC voltage oscillation signal demodulation information on the information receiving side is specifically: Performing signal input processing on the high-frequency AC voltage oscillation signal on the information receiving side to obtain the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side; Signal conditioning is performed on the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side, a DC voltage pulse linearly related to the amplitude of the high-frequency AC component contained in the high-frequency AC voltage oscillation signal on the information receiving side is obtained, and amplitude information of the DC voltage pulse is collected.

9. The power information dual modulation method based on high frequency harmonic amplitude modulation according to claim 8, characterized in that: The signal input processing of the high-frequency AC voltage oscillation signal at the information receiving side includes but is not limited to high-pass filtering and signal isolation.

10. The power information dual modulation method based on high frequency harmonic amplitude modulation according to claim 8, characterized in that: The signal conditioning performed on the high-frequency AC component contained in the high-frequency AC voltage oscillation signal at the information receiving side includes but is not limited to bandpass filtering and envelope detection.

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