CN111404580A - OFDM-based DC/DC converter power line power signal composite transmission system and transmission method - Google Patents

OFDM-based DC/DC converter power line power signal composite transmission system and transmission method Download PDF

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CN111404580A
CN111404580A CN202010211909.7A CN202010211909A CN111404580A CN 111404580 A CN111404580 A CN 111404580A CN 202010211909 A CN202010211909 A CN 202010211909A CN 111404580 A CN111404580 A CN 111404580A
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signal
circuit
power
voltage
processor
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CN111404580B (en
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于东升
卫紫任
叶宗彬
昝小舒
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Abstract

The invention discloses a power line power signal composite transmission system of a DC/DC converter based on OFDM, which comprises a power circuit, a control circuit, a voltage sensor, a current sensor and a drive circuit, wherein the power circuit is electrically connected with the control circuit through the voltage sensor and the current sensor, the control circuit is electrically connected with the power circuit through the drive circuit, and the voltage sensor, the current sensor and the drive circuit are used for realizing electrical isolation between the power circuit and the control circuit. The invention realizes that the communication function is embedded into the converter system without erecting coupling equipment, thereby not only reducing the volume and the operation cost of the system, but also reducing the problem of electromagnetic interference, improving the stability of the system, realizing the modulation of a plurality of signals in a single converter, greatly improving the frequency spectrum utilization rate and the anti-interference capability of the system, being easy to identify and demodulate the signals and having the advantage of effectively inhibiting the inter-code interference and the inter-carrier interference.

Description

OFDM-based DC/DC converter power line power signal composite transmission system and transmission method
Technical Field
The invention relates to the technical field of distributed power generation systems, in particular to a power line power signal composite transmission system and a power line power signal composite transmission method of a DC/DC converter based on OFDM.
Background
In recent years, a large number of power electronic devices are applied to a distributed power generation system, and although a power grid combines power ends of the devices together, so that the system can operate safely and reliably, the coordinated operation of distributed power generation on each device of the power grid under the condition of high permeability cannot be fundamentally changed, and a complex power distribution network cannot be met, so that the maximum utilization of renewable energy sources is difficult to realize. The problem of instability of renewable energy sources can be overcome only by realizing the sharing of renewable energy source power generation information, controlling energy flow by information flow and realizing the efficient transmission and sharing of the power generated by the renewable energy sources, and the real effective utilization of the renewable energy sources is realized.
The composite communication is realized by assuming a special communication cable, mainly comprising CAN bus communication, Ethernet communication, Zigbee communication and the like, although laying an independent channel CAN improve the anti-interference capability of signals, the independent communication is not suitable for a power distribution network with a complex circuit environment, the high cost and the wiring mode are not suitable for the complex circuit environment, the composite communication is a power transmission and signal transmission integrated mode, namely, the transmission of signals is realized while transmitting power, the power line carrier communication is a communication mode by using the existing power line, the technology is a mode for carrying out communication by transmitting high-frequency current carrying information through the wire, then the information is separated from the current through an adapter at a receiving end to realize the transmission of the information, and the communication technology is a communication mode which is greatly simplified by using a traditional power line modulation and wiring mode, so that the cost of the communication system is greatly increased, and the communication cost is reduced.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a power line power signal composite transmission system and a power line power signal composite transmission method of a DC/DC converter based on OFDM (orthogonal frequency division multiplexing), aiming at the problems that the prior power signal composite transmission method of the power converter under the condition of parallel connection is not only weak in system frequency spectrum utilization rate and anti-interference capability, but also not easy to identify and demodulate signals.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a power line power signal composite transmission system of a DC/DC converter based on OFDM comprises a power circuit, a control circuit, a voltage sensor, a current sensor and a driving circuit, wherein the power circuit is electrically connected with the control circuit through the voltage sensor and the current sensor;
the voltage sensor is used for isolating and sampling the voltage at the output end of the Buck circuit and inputting a sampled signal into the control circuit;
the current sensor is used for isolating and sampling the inductance current of the Buck circuit and inputting a sampled signal into the control circuit;
the driving circuit is used for receiving a pulse signal of the control circuit, realizing electrical isolation between the control circuit and the power converter and controlling the on-off of a power switch tube of the main circuit.
Furthermore, the power circuit comprises a Buck circuit, an input voltage source, a power resistor and a power line, wherein the input voltage source is electrically connected with the Buck circuit, the Buck circuit is electrically connected with the control circuit through a voltage sensor and a current sensor, the Buck circuit is electrically connected with the power line, and the Buck circuit and the power resistor are connected in parallel.
Furthermore, the control circuit comprises a processor, a driving power supply, a signal generator and a signal demodulation module, wherein the signal generator is electrically connected with the processor, the driving power supply is electrically connected with the driving circuit, the driving circuit is electrically connected with the processor and the Buck circuit, and the power line is electrically connected with the signal demodulation module through a power resistor.
Further, the signal generator synthesizes sinusoidal carriers with different frequencies into a serial superposed signal and sends the serial superposed signal to the processor, the sinusoidal carrier signals are orthogonal in a code element period, and the frequency bands of the signals modulated by the Buck circuit are not overlapped.
Furthermore, the measuring output end of the voltage sensor and the measuring output end of the current sensor are both connected in series with an adjustable rheostat for realizing the change ratio of the input and the output of the voltage sensor and the change ratio of the input and the output of the current sensor.
A transmission method of a power line power signal composite transmission system of a DC/DC converter based on OFDM specifically comprises the following steps:
s1: the voltage sensor samples the voltage at the output end of the Buck circuit and sends the sampled voltage at the output end to the processor, and the current sensor samples the inductive current of the Buck circuit and sends the sampled inductive current to the processor;
s2: the signal generator sends an analog carrier signal of a digital signal to be transmitted to the processor, and the processor outputs a control pulse sequence according to the sampled output end voltage, the sampled inductive current and the analog carrier signal of the digital signal to be transmitted, and sends the control pulse sequence to the driving circuit;
s3: the driving circuit adjusts the duty ratio signal of the Buck circuit according to the control pulse sequence, loads the duty ratio signal in the output voltage of the Buck circuit, samples the voltages at two ends of the power resistor through the signal demodulation module, performs FFT analysis on the sampled voltages at two ends of the power resistor, and acquires the digital signal to be transmitted.
Further, in step S2, the control pulse sequence is output as follows:
s2.1: a sampling module in the processor samples output end voltage sampled by the voltage sensor, inductive current sampled by the current sensor and an analog carrier signal of a digital signal to be transmitted sent by the signal generator;
s2.2: comparing the output end voltage sampled by the voltage sensor with an analog carrier signal of a digital signal to be transmitted sent by a signal generator to make a difference, and simultaneously performing voltage digital proportional-integral regulation calculation to obtain a voltage digital proportional-integral regulation calculation result;
s2.3: comparing the voltage digital proportional-integral regulation calculation result with the inductive current sampled by the current sensor to obtain a difference, and simultaneously performing current digital proportional-integral regulation calculation to obtain a current digital proportional-integral regulation calculation result;
s2.4: and a pulse module in the processor adjusts a calculation result according to the current digital proportional-integral, and outputs the control pulse sequence.
Further, before the voltage sensor sends the sampled output end voltage to the processor, the sampled output end voltage needs to be filtered.
Further, the highest frequency transmitted by the signal generator is not more than half of the sampling frequency of the processor.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
the invention is based on OFDM technology, realizes the embedding of communication function into the converter system, does not need to erect coupling equipment, not only reduces the volume and the operation cost of the system, but also reduces the problem of electromagnetic interference, improves the stability of the system, realizes the modulation of a plurality of signals in a single converter, greatly improves the spectrum utilization rate and the anti-interference capability of the system, is easy to identify and demodulate signals, and has the advantage of effectively inhibiting intersymbol interference and intercarrier interference.
Drawings
FIG. 1 is a block diagram of a parallel Buck circuit power signal composite transmission system based on OFDM;
fig. 2 is a flow chart of the transmission method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. The described embodiments are a subset of the embodiments of the invention and are not all embodiments of the invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Example 1
Referring to fig. 1, the present embodiment provides an OFDM-based DC/DC converter power line power signal composite transmission system, and is illustrated by a parallel Buck converter power line carrier power signal composite transmission circuit in the present embodiment. The power line carrier power signal composite transmission circuit of the parallel Buck converter comprises a power circuit 1, a power circuit 2, a control circuit 1, a control circuit 2 and a voltage sensor Hv1Voltage sensor Hv2Current sensor Hc1Current sensor Hc2And a drive circuit D1And a drive circuit D2. In which the power circuit 1 passes a voltage sensor Hv1And a current sensor Hc1Electrically connected to the control circuit 1, the control circuit 1 is connected to the driving circuit D1Is electrically connected with the power circuit 1. Likewise, the power circuit 2 passes through the voltage sensor Hv2And a current sensor Hc2Electrically connected to the control circuit 2, the control circuit 2 drives the circuit D2Is electrically connected with the power circuit 2.
Simultaneous voltage sensor Hv1Measurement output terminal of (1), voltage sensor Hv2Measurement output terminal of (2), current sensor Hc1Measurement output and current sensor Hc2The measuring output ends are all connected with an adjustable rheostat in series for realizing a voltage sensor Hv1Input/output change ratio and voltage sensor Hv2Input/output change ratio and current sensor Hc1Input/output change ratio and current sensor Hc2Ratio of change of input and output.
Specifically, the power circuit 1 includes a Buck circuit 1 and an input voltage source V1Power resistor R and power line LpWherein the power resistor R and the power line LpIs also provided in the power circuit 2. Input voltage source V1The Buck circuit 1 is electrically connected, and the Buck circuit 1 passes through the voltage sensor Hv1And a current sensor Hc1The Buck circuit 1 is electrically connected with the control circuit 1, and the Buck circuit 1 is electrically connected with the power line LpMeanwhile, the Buck circuit 1 and the power resistor R are connected in parallel.
Similarly, the power circuit 2 comprises a Buck circuit 2 and an input voltage source V2Input voltage source V2The Buck circuit 2 is electrically connected, and the Buck circuit 2 passes through the voltage sensor Hv2And a current sensor Hc2The Buck circuit 2 is electrically connected with the control circuit 2, and the Buck circuit 2 is electrically connected with the power line LpMeanwhile, the Buck circuit 2 and the power resistor R are connected in parallel.
Wherein, Buck circuit 1 and Buck circuit 2 are all used for realizing the transform of electric energy.
Input voltage source V1For supplying energy to the Buck circuit 1, input voltage source V2For energizing the Buck circuit 2.
The power resistor R is used as a common load for the Buck circuit 1 and the Buck circuit 2.
Power line LpAnd a transmission channel for establishing power and signals between the Buck circuit 1 or the Buck circuit 2 and the power resistor R.
Specifically, the control circuit 1 includes a processor 1 and a driving power supply Ds1Signal generator 1 and signal demodulation module SdWhich isMedium signal demodulation module SdAlso provided in the control circuit 2. The signal generator 1 is electrically connected with the processor 1 and the driving power supply Ds1Electrically connected with the driving circuit D1A drive circuit D1A power line L electrically connecting the processor 1 and the Buck circuit 1pIs electrically connected with the signal demodulation module S through the power resistor Rd。
Similarly, the control circuit 2 includes a processor 2 and a driving power supply Ds2And the signal generator 2 is electrically connected with the processor 2 and drives the power supply Ds2Electrically connected with the driving circuit D2A drive circuit D2A power line L electrically connecting the processor 2 and the Buck circuit 2pIs electrically connected with the signal demodulation module S through the power resistor Rd。
Wherein the processor 1 is arranged to receive a voltage sensor Hv1Current sensor Hc1And the signal generator 1 calculates the received signal and outputs a control pulse signal to realize closed-loop regulation control of the Buck circuit 1. The processor 2 is used for receiving the voltage sensor Hv2Current sensor Hc2And the signal generator 2 calculates the received signal and outputs a control pulse signal to realize closed-loop regulation control of the Buck circuit 2.
Driving power supply Ds1For the drive circuit D1To supply power and drive a power supply Ds2For the drive circuit D2And supplying power.
Drive circuit D1For receiving signals from the processor 1, controlling the power switch tube in the Buck circuit 1, and a driving circuit D2For receiving signals from the processor 2 to control the power switch tube in the Buck circuit 2.
The signal generator 1 is used for converting a digital signal to be transmitted into an analog carrier signal and inputting the analog carrier signal into the processor 1, and the signal generator 2 is used for converting the digital signal to be transmitted into an analog carrier signal and inputting the analog carrier signal into the processor 2.
Meanwhile, the signal generator 1 and the signal generator 2 can synthesize sinusoidal carriers with different frequencies into a serial superposed signal and send the serial superposed signal to the processor 1 and the processor 2, meanwhile, the sinusoidal carrier signals are orthogonal in a code element period, and the frequency bands of the signals modulated by the Buck circuit 1 and the Buck circuit 2 are not overlapped with each other.
Signal demodulation module SdFor demodulating the analog carrier signal and recovering the original digital signal.
In the present embodiment, processor 1, processor 2 and signal demodulation module SdDSP28335 microprocessors of Texas Instruments are adopted, and peripheral devices such as an ADC sampling module and an ePWM output module are integrated on a core board of the DSP28335 microprocessors. Voltage sensor Hv1And a voltage sensor Hv2Adopts Hall sensing element CHV25P space wave module and current sensor Hc1And a current sensor Hc2The Hall sensing element L V50P is adopted to drive a circuit D1And a drive circuit D2The device is provided with a 6N137 chip or an IR2104 chip, wherein the 6N137 chip is used for realizing the electrical isolation of signals, and the IR2104 chip is used for outputting pulse signals.
Wherein the IO output high level of the DSP28335 microprocessor is only +3.3V, which is a driving circuit D1And a drive circuit D2Power MOS switch tube in (1), drive circuit D1And a drive circuit D2The power supply of (2) is required to be +15V, and the driving circuit D1And a drive circuit D2Should be around 150 omega to drive the current to 1A.
Referring to fig. 2, the present embodiment provides a transmission method of an OFDM-based DC/DC converter power line power signal composite transmission system, which specifically includes the following steps:
step S1: voltage sensor Hv1Sampling the output end voltage of the Buck circuit 1, sending the sampled output end voltage to the processor 1, and using the current sensor H to measure the output end voltagec1The inductive current of the Buck circuit 1 is sampled, and the sampled inductive current is sent to the processor 1.
Voltage sensor Hv2Sampling the output end voltage of the Buck circuit 2, sending the sampled output end voltage to the processor 2, and using the current sensor Hc2Inductive current to Buck circuit 2Samples are taken and the inductor current obtained by the sampling is sent to the processor 2.
Voltage sensor Hv1And a voltage sensor Hv2When sampling the voltage, the main circuit, the control circuit 1 and the control circuit 2 need to be electrically isolated at the same time.
Current sensor Hc1And a current sensor Hc2When sampling the current, it is also necessary to electrically isolate the main circuit, the control circuit 1, and the control circuit 2 at the same time.
Notably, the voltage sensor Hv1The voltage sensor H is arranged to sense the sampled output voltage before it is sent to the processor 1v2Before the sampled output end voltage is sent to the processor 2, the sampled output end voltage needs to be filtered, so that it is ensured that the signal sampled by the processor 1 only contains the frequency information of the signal sent by the signal generator 1, and the signal sampled by the processor 2 only contains the frequency information of the signal sent by the signal generator 2.
Step S2: the signal generator 1 synthesizes the parallel sine carriers with different frequencies into a serial superposed signal which is sent to the processor 1, and the sine signals are orthogonal in a code element period and do not overlap with the frequency band of the signal sent by the signal generator 2.
The signal generator 2 synthesizes the parallel sine carriers with different frequencies into a serial superposed signal which is sent to the processor 2, and the sine signals are orthogonal in the code element period and do not overlap with the frequency band of the signal sent by the signal generator 1. This is because the frequency information sent by the signal generator 1 and the signal generator 2 should be different frequency bands to make the demodulation result more clear, such as: the frequency band transmitted by the signal generator 1 is 1 k-5 kHz, and the frequency band transmitted by the signal generator 2 is 6 k-10 kHz.
The highest frequency sent by the signal generator 1 is not more than half of the sampling frequency of the processor 1, and the highest frequency sent by the signal generator 2 is not more than half of the sampling frequency of the processor 2, so that the sampling is accurate enough. In this embodiment, the carrier signal should not exceed 10kHz at maximum.
The processor 1 and the processor 2 output a control pulse sequence according to the sampled output end voltage, the sampled inductive current and the analog carrier signal of the digital signal to be transmitted, and send the control pulse sequence to the driving circuit D1And a drive circuit D2The method specifically comprises the following steps:
step S2.1: ACD sampling module in processor 1 couples to voltage sensor Hv1Sampled output end voltage and current sensor Hc1The sampled inductive current is sampled with an analog carrier signal of a digital signal to be transmitted sent by the signal generator 1.
ACD sampling module in processor 2 couples to voltage sensor Hv2Sampled output end voltage and current sensor Hc2The sampled inductor current is sampled with an analog carrier signal of the digital signal to be transmitted sent by the signal generator 21.
In order to ensure the precision of signal sampling, the frequency of the ACD sampling module inside the processor 1 and the frequency of the ACD sampling module inside the processor 2 are both set to be 50kHz, and the setting frequency of the pulse module is 100kHz to ensure that the operation cycle of the processor 1 and the processor 2 after each sampling is within 20 mus.
Step S2.2: voltage sensor Hv1Comparing the sampled output end voltage with the analog carrier signal of the digital signal to be transmitted sent by the signal generator 1 to make difference, and simultaneously performing voltage digital proportional-integral regulation calculation to obtain a voltage digital proportional-integral regulation calculation result PIv1。
Voltage sensor Hv2Comparing the sampled output end voltage with the analog carrier signal of the digital signal to be transmitted sent by the signal generator 2 to make difference, and simultaneously carrying out voltage digital proportional-integral regulation calculation to obtain a voltage digital proportional-integral regulation calculation result PIv2。
Step S2.3: adjusting the voltage digital proportional integral to a calculation result PIv1Current sensor Hc1The sampled inductive currents are compared and subtracted, and the current digital proportional integral adjustment calculation is carried out at the same time to obtainCurrent-taking digital proportional integral adjustment calculation result PIc1。
Adjusting the voltage digital proportional integral to a calculation result PIv2Current sensor Hc2Comparing the sampled inductive currents to obtain a difference, and simultaneously performing current digital proportional integral adjustment calculation to obtain a current digital proportional integral adjustment calculation result PIc2。
Step S2.4: the pulse module in the processor 1 adjusts the calculation result PI according to the current digital proportional integralc1A series of control pulse sequences are output, and the pulse module in the processor 2 also adjusts the calculation result PI according to the current digital proportional-integralc2And outputting a series of control pulse sequences.
Step S3: drive circuit D1According to a series of control pulse sequences sent by the processor 1, the duty ratio signal of the Buck circuit 1 is adjusted, and the duty ratio signal of the Buck circuit 1 is loaded in the output voltage of the Buck circuit 1. Drive circuit D2And according to a series of control pulse sequences sent by the processor 2, adjusting the duty ratio signal of the Buck circuit 2, and loading the duty ratio signal of the Buck circuit 2 into the output voltage of the Buck circuit 2.
Since the power resistor R is used as a common load for the Buck circuit 1 and the Buck circuit 2, only the signal demodulation module S is required heredThe voltage at the two ends of the power resistor R is sampled, and the sampled voltage at the two ends of the power resistor R is subjected to FFT analysis, so that the digital signal to be transmitted can be obtained.
It is noted that the driving circuit D1At the output duty ratio signal and the driving circuit D2When the duty ratio signal is output, the main circuit, the control circuit 1, and the control circuit 2 need to be electrically isolated at the same time.
Specifically, taking a single carrier as an example, when a data signal 1 is transmitted, sinusoidal carrier signals of corresponding frequencies are superposed at reference voltages of the Buck circuit 1 and the Buck circuit 2, a modulation signal is loaded in a modulation wave of a comparator after passing through a compensation network, and the secondary sinusoidal carrier signals are modulated into an output voltage by modulating a duty ratio signal. When the data signal 0 is sent, the sine carrier signal is not superposed, and the output voltage has no sine signal response.
The present invention and its embodiments have been described in an illustrative manner, and are not to be considered limiting, as illustrated in the accompanying drawings, which are merely exemplary embodiments of the invention and not limiting of the actual constructions and methods. Therefore, if the person skilled in the art receives the teaching, the structural modes and embodiments similar to the technical solutions are not creatively designed without departing from the spirit of the invention, and all of them belong to the protection scope of the invention.

Claims (9)

1. The OFDM-based DC/DC converter power line power signal composite transmission system is characterized by comprising a power circuit, a control circuit, a voltage sensor, a current sensor and a driving circuit, wherein the power circuit is electrically connected with the control circuit through the voltage sensor and the current sensor;
the voltage sensor is used for isolating and sampling the voltage at the output end of the Buck circuit and inputting a sampled signal into the control circuit;
the current sensor is used for isolating and sampling the inductance current of the Buck circuit and inputting a sampled signal into the control circuit;
the driving circuit is used for receiving a pulse signal of the control circuit, realizing electrical isolation between the control circuit and the power converter and controlling the on-off of a power switch tube of the main circuit.
2. The OFDM-based DC/DC converter power line power signal composite transmission system as claimed in claim 1, wherein the power circuit comprises a Buck circuit, an input voltage source, a power resistor and a power line, the input voltage source is electrically connected to the Buck circuit, the Buck circuit is electrically connected to the control circuit through a voltage sensor and a current sensor, the Buck circuit is electrically connected to the power line, and the Buck circuit and the power resistor are connected in parallel.
3. The OFDM-based DC/DC converter power line power signal composite transmission system as claimed in claim 1 or 2, wherein the control circuit comprises a processor, a driving power supply, a signal generator and a signal demodulation module, the signal generator is electrically connected to the processor, the driving power supply is electrically connected to the driving circuit, the driving circuit is electrically connected to the processor and the Buck circuit, and the power line is electrically connected to the signal demodulation module through a power resistor.
4. The OFDM-based DC/DC converter power line power signal composite transmission system as claimed in claim 3, wherein said signal generator synthesizes sinusoidal carriers of different frequencies into a serial superimposed signal and sends the serial superimposed signal to the processor, said sinusoidal carrier signals are orthogonal in symbol period, and the frequency bands of the signals modulated by said Buck circuit do not overlap each other.
5. The OFDM based DC/DC converter power line power signal composite transmission system as claimed in claim 3, wherein the measurement output terminal of the voltage sensor and the measurement output terminal of the current sensor are connected in series with an adjustable rheostat for realizing the variation ratio of the input and output of the voltage sensor and the variation ratio of the input and output of the current sensor.
6. The transmission method of the OFDM-based DC/DC converter power line power signal composite transmission system according to any one of claims 1 to 5, wherein the transmission method specifically comprises the steps of:
s1: the voltage sensor samples the voltage at the output end of the Buck circuit and sends the sampled voltage at the output end to the processor, and the current sensor samples the inductive current of the Buck circuit and sends the sampled inductive current to the processor;
s2: the signal generator sends an analog carrier signal of a digital signal to be transmitted to the processor, and the processor outputs a control pulse sequence according to the sampled output end voltage, the sampled inductive current and the analog carrier signal of the digital signal to be transmitted, and sends the control pulse sequence to the driving circuit;
s3: the driving circuit adjusts the duty ratio signal of the Buck circuit according to the control pulse sequence, loads the duty ratio signal in the output voltage of the Buck circuit, samples the voltages at two ends of the power resistor through the signal demodulation module, performs FFT analysis on the sampled voltages at two ends of the power resistor, and acquires the digital signal to be transmitted.
7. The transmission method of the OFDM-based DC/DC converter power line power signal composite transmission system according to claim 6, wherein in the step S2, the control pulse sequence is outputted as follows:
s2.1: a sampling module in the processor samples output end voltage sampled by the voltage sensor, inductive current sampled by the current sensor and an analog carrier signal of a digital signal to be transmitted sent by the signal generator;
s2.2: comparing the output end voltage sampled by the voltage sensor with an analog carrier signal of a digital signal to be transmitted sent by a signal generator to make a difference, and simultaneously performing voltage digital proportional-integral regulation calculation to obtain a voltage digital proportional-integral regulation calculation result;
s2.3: comparing the voltage digital proportional-integral regulation calculation result with the inductive current sampled by the current sensor to obtain a difference, and simultaneously performing current digital proportional-integral regulation calculation to obtain a current digital proportional-integral regulation calculation result;
s2.4: and a pulse module in the processor adjusts a calculation result according to the current digital proportional-integral, and outputs the control pulse sequence.
8. The transmission method of the OFDM-based DC/DC converter power line power signal composite transmission system according to claim 6 or 7, wherein the voltage sensor is required to filter the sampled output voltage before sending the sampled output voltage to the processor.
9. The transmission method of the OFDM based DC/DC converter power line power signal composite transmission system according to claim 6 or 7, wherein the highest frequency transmitted by the signal generator is not more than half of the sampling frequency of the processor.
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