CN113098290A - Method and system for realizing data modulation at output end of LLC resonant converter - Google Patents
Method and system for realizing data modulation at output end of LLC resonant converter Download PDFInfo
- Publication number
- CN113098290A CN113098290A CN202110545175.0A CN202110545175A CN113098290A CN 113098290 A CN113098290 A CN 113098290A CN 202110545175 A CN202110545175 A CN 202110545175A CN 113098290 A CN113098290 A CN 113098290A
- Authority
- CN
- China
- Prior art keywords
- llc resonant
- resonant converter
- data
- modulation
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a method and a system for realizing data modulation at the output end of an LLC resonant converter. The LLC resonant converter can realize the synchronous transmission of power and data by using the method, and the receiver demodulates the signal at the output end of the LLC resonant converter to obtain the transmitted data. The invention utilizes the LLC resonant converter to transmit data without adding any circuit or device for data modulation, thereby reducing the complexity and the loss of hardware.
Description
Technical Field
The invention belongs to the technical field of power line carrier communication, and particularly relates to a method and a system for realizing data modulation at an output end of an LLC resonant converter.
Background
The LLC resonant converter has the characteristics of high efficiency, high power density, and the like, and has been widely used in the fields such as communication power supplies, LED driving power supplies, industrial power supplies, electric vehicles, and the like. In addition to achieving power transfer, LLC resonant converters in the above application scenarios often need to communicate with the outside world.
Common communication modes include wired communication such as a CAN bus and RS-485, wireless communication such as WIFI and Zigbee, power line carrier communication and the like. Wired communication technology has been widely used and is very reliable, but additional communication cables add cost and complexity to the system. The wireless communication technology that has emerged in recent years does not require an additional communication cable and thus becomes an attractive communication scheme, but the reliability of wireless communication is often questioned because it is susceptible to environmental influences and to external attacks. The power line carrier communication technology is a method for performing communication by using an existing power line, does not need an additional communication cable, and is widely applied to occasions with low requirements on communication speed. Because the power electronic converter finishes power transmission by switching on and off the switching tube, the power transmission is realized while switching ripples are generated, and the switching ripples can be utilized for communication, namely, a power signal composite modulation technology. According to the method, the communication is embedded into the power conversion circuit, and extra wiring and coupling circuits are not needed, so that the system structure is simplified, the cost and loss caused by the extra communication circuit are avoided, and the method has a good application prospect.
Power signal complex modulation techniques, in which data modulation is achieved by the converter itself and communication is performed, have been widely studied. Based on this idea, chinese patent No. 201410293455.7 proposes a photovoltaic optimizer integrated with data communication function. The document (Wu J, Du J, Lin Z, et al. Power Conversion and Signal Transmission Integration Method Based on Dual Modulation of DC-DC Converters [ J ]. IEEE Transactions on Industrial Electronics,2015,62(2):1291-1300) summarizes two basic Dual Modulation methods (PWM/FSK and PWM/PSK) Based on the Method, discusses key points for designing the PWM/FSK system, including topology selection, carrier shape and carrier frequency, and provides theoretical guidance for the subsequent research of the Method.
However, the above patents and documents are based on PWM type converters, and cannot be directly applied to the LLC resonant converter of PFM type. If a method for realizing data modulation at the output end of the LLC resonant converter is designed, the LLC resonant converter in the above application scenario can communicate with the outside world.
Disclosure of Invention
In view of the above, the present invention provides a method for implementing data modulation at an output terminal of an LLC resonant converter, which enables the LLC resonant converter to implement synchronous transmission of power and data.
The technical scheme adopted by the invention is as follows:
a method for realizing data modulation at the output end of an LLC resonant converter is disclosed, wherein a control loop of the LLC resonant converter comprises a data modulation outer loop and a power control inner loop, wherein the power control inner loop is designed in a traditional control mode and is designed by adjusting an output frequency f0The output voltage is controlled. The data modulation outer ring carries out frequency band modulation on data d (t) to be sent to obtain a modulation signal fd(t)，fd(t) output f from the inner loop of the power control0And the sum is used as the switching frequency of the LLC resonant converter, so that data information is superposed on the output port.
Further, the band modulation controls the carrier with the data d (t) to be transmitted, thereby converting the data d (t) to be transmitted into a modulated signal fdAnd (t), wherein the frequency band modulation method adopts ASK, PSK or FSK and the like, and the carrier wave adopts sine wave, square wave and the like, and the frequency of the carrier wave is less than the switching frequency of the LLC resonant converter.
Further, the switching frequency of the LLC resonant converter is greater than the corresponding peak frequency of the LLC resonant converter at peak voltage gain.
Further, the LLC resonant converter does not need to add any circuit or device for data modulation; the LLC resonant converter adopts a full-bridge or half-bridge circuit topology structure, and the rectifying circuit of the LLC resonant converter adopts a full-bridge rectifying or half-bridge rectifying structure.
Further, a receiver collects signals at the output end of the LLC resonant converter, filtering and sampling are carried out, and transmitted data are demodulated by using a DFT algorithm.
The invention also provides an LLC resonant converter system realized based on the method, which comprises the following steps:
and the LLC resonant converter is used for power transmission and data transmission.
And the sampling module is used for sampling the power signal of the LLC resonant converter and outputting a sampling value.
A compensation network module for compensating the sampling value and outputting frequency f0。
A band modulation module, configured to perform band modulation on data d (t) to be transmitted and output a modulation signal fd(t)。
A square-wave generator module for outputting a frequency value equal to f0+fd(t) square wave signal.
And the driving module is used for driving a switching device in the LLC resonant converter after the power amplification is carried out on the square wave signal output by the square wave generator module.
And the receiver is used for acquiring a signal at the output end of the LLC resonant converter, filtering and sampling the signal, and demodulating the transmitted data by using a DFT algorithm.
Based on the technical scheme, the invention has the following beneficial technical effects:
1. the invention can enable the LLC resonant converter to realize synchronous transmission of power and data.
2. The invention can realize a plurality of frequency band modulation methods based on the LLC resonant converter, including ASK, PSK, FSK and the like.
3. The method provided by the invention does not need to add any circuit or device for data modulation, and reduces the complexity and loss of hardware.
Drawings
Fig. 1 is a block diagram of an LLC resonant converter system in which the method according to the invention can be implemented.
FIG. 2 shows data d (t), carrier and modulation signal f for band modulation in FIG. 1 to be transmittedd(t) waveform diagram.
Fig. 3 is a schematic diagram of the modulation and demodulation process.
Fig. 4 is a block diagram of an embodiment of an LLC resonant converter system in which the method according to the invention can be implemented.
Fig. 5 is a schematic diagram of the switching frequency of an LLC resonant converter as a function of time.
Fig. 6 is a waveform diagram of the output voltage of the LLC resonant converter.
Fig. 7 is a waveform diagram of the output voltage of the LLC resonant converter after filtering.
Fig. 8 is a schematic diagram of a data frame received and demodulated by a receiver.
Detailed Description
In order to more specifically describe the present invention, the following detailed description is provided for the technical solution of the present invention with reference to the accompanying drawings and the specific embodiments.
The invention provides a method for realizing data modulation at the output end of an LLC resonant converter, wherein a control loop of the LLC resonant converter comprises a data modulation outer loop and a power control inner loop, the power control inner loop is designed in a traditional control mode, and the output frequency f is adjusted0The output voltage is controlled. The data modulation outer ring carries out frequency band modulation on data d (t) to be sent to obtain a modulation signal fd(t)，fd(t) output f from the inner loop of the power control0And the sum is used as the switching frequency of the LLC resonant converter, so that data information is superposed on the output port.
Fig. 1 shows a block diagram of an LLC resonant converter system capable of implementing the above method, which includes a main power module, i.e., an LLC resonant converter, a sampling module, a compensation network module, a band modulation module, a square-wave generator module, and a driving module. The output of the sampling module is used as the input of the compensation network module; taking data d (t) to be sent as input of the frequency band modulation module; output f of the compensation network module0And the output f of the band modulation moduled(t) adding the frequency values to obtain a frequency value of the square wave generated by the square wave generator module; the output of the square wave generator module is used as the input of the driving module.
The function of each module of the above system is as follows:
the main power module performs power transmission and data transmission.
The sampling module samples the power signal of the main power module and outputs a sampling value;
the compensation network module compensates the sampling value and outputs frequency f0；
The frequency band modulation module carries out frequency band modulation on data d (t) to be transmitted and then outputs a modulation signal fd(t)；
The square wave generator module outputs a square wave with a frequency value equal to f0+fd(t)；
The driving module is used for amplifying the power of the square wave output by the square wave generator module and then driving a switching device in the main power module.
The LLC resonant converter system can work in an idle stage and a communication stage, a frequency band modulation module in the idle stage has no output, and the system only carries out power transmission; communication phase band modulation module output fd(t)，fd(t) and the output f of the compensation network module0And the sum is used as the switching frequency of the LLC resonant converter, so that data information is superposed on the output port.
On the basis, the frequency band modulation of the invention uses the data d (t) to be transmitted to control the carrier wave, thereby converting the data d (t) to be transmitted into a modulation signal fdAnd (t), wherein the frequency band modulation method adopts ASK, PSK or FSK and the like, and the carrier wave adopts sine wave, square wave and the like, and the frequency of the carrier wave is less than the switching frequency of the LLC resonant converter.
As an alternative embodiment, fig. 2 shows data d (t), carrier and modulation signal f to be transmitted in the process of frequency band modulationd(t) waveform diagram. For convenience of understanding, in the figure, the data d (t) to be transmitted takes binary symbols of "10011001" as an example, the size of the data d (t) is "+ 1" when data 1 is transmitted, and the size of the data d (t) is "-1" when data 0 is transmitted, that is, a frequency band modulation method of PSK is adopted; the carrier is a square wave with a 50% duty cycle and the duration of a single binary symbol is assumed to be three times the carrier period.
On the basis, the method for realizing data modulation at the output end of the LLC resonant converter requires that the switching frequency of the LLC resonant converter is greater than the corresponding peak frequency of the LLC resonant converter during peak voltage gain.
On the basis, the LLC resonant converter does not need to add any circuit or device for data modulation; the LLC resonant converter adopts a full-bridge or half-bridge circuit topology structure, and the rectifying circuit of the LLC resonant converter adopts a full-bridge rectifying or half-bridge rectifying structure.
On the basis, a receiver collects signals at the output end of the LLC resonant converter, then carries out filtering and sampling, and demodulates sent data by applying a DFT algorithm.
Fig. 3 shows a schematic diagram of the whole modulation and demodulation process.
In the following, a specific example of implementation according to the present invention is shown in fig. 4, which shows a block diagram of an LLC resonant converter system in this case, wherein a main power module employs an LLC resonant converter in a half-bridge configuration; the compensation network module, the frequency band modulation module and the square wave generator module of the system are all realized by using a digital controller (DSP, FPGA, CPLD and the like), so the system does not need to add any additional circuit or device for data modulation; the power control inner loop adopts a voltage negative feedback control scheme, and the data modulation outer loop adopts a PSK frequency band modulation method.
The circuit parameters are shown in table 1:
TABLE 1
The parameters ensure that the switching frequency of the LLC resonant converter is greater than the corresponding peak frequency of the LLC resonant converter when the peak voltage gains; setting a data frame of data d (t) to be transmitted to contain 8 binary code elements, namely '10011001', wherein the size of the data frame is '+ 1' when data 1 is transmitted and '-1' when data 0 is transmitted, thereby realizing PSK modulation; setting the duration of each binary code element of d (t) to be 0.25ms, and setting the interval between every two data frames to be 2 ms; the carrier wave is set as a square wave with a duty cycle of 50% and a magnitude of Δ f of 1000Hz, and the frequency of the square wave is 24 kHz.
When the LLC system resonant converter system is working normally, the change of its switching frequency with time is shown in fig. 5; the output voltage waveform is shown in fig. 6; the waveform of the output voltage after filtering is shown in fig. 7. It can be seen from the waveforms that the output voltage amplitude shown in fig. 6 does not change much, and the data modulation does not affect the original power transmission; the waveform in fig. 7 can clearly see the data frame, and the receiver can demodulate the transmitted data d (t) by using the DFT algorithm after sampling the waveform in fig. 7, thereby completing the whole communication process; fig. 8 shows a demodulated data frame, which carries the same data information as fig. 5.
The existing method for realizing data modulation at the output end of the LLC resonant converter needs to add extra circuits or devices for data modulation, but the method for realizing data modulation at the output end of the LLC resonant converter does not need to add extra circuits or devices on the original circuit structure, thereby greatly reducing the complexity and the loss of hardware.
The foregoing description of the embodiments is provided to enable one of ordinary skill in the art to make and use the invention, and it is to be understood that other modifications of the embodiments, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty, as will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (6)
1. A method of implementing data modulation at an output of an LLC resonant converter, characterized by: the control loop of the LLC resonant converter comprises a data modulation outer loop and a power control inner loop, wherein the power control inner loop adjusts the output frequency f0The output voltage is controlled. The data modulation outer ring carries out frequency band modulation on data d (t) to be sent to obtain a modulation signal fd(t)，fd(t) output f from the inner loop of the power control0Added to act as LLC resonant converterSwitching the frequency so that the data information is superimposed on the output port.
2. A method of implementing data modulation at the output of an LLC resonant converter as claimed in claim 1, wherein: the frequency band modulation specifically comprises: the carrier is controlled by the data d (t) to be transmitted, so that the data d (t) to be transmitted is converted into a modulated signal fdAnd (t), wherein the frequency band modulation method adopts ASK, PSK or FSK and the like, and the carrier wave adopts sine wave, square wave and the like, and the frequency of the carrier wave is less than the switching frequency of the LLC resonant converter.
3. A method of implementing data modulation at the output of an LLC resonant converter as claimed in claim 1, wherein: and the switching frequency of the LLC resonant converter is greater than the corresponding peak frequency of the LLC resonant converter at the peak voltage gain.
4. A method of implementing data modulation at the output of an LLC resonant converter as claimed in claim 1, wherein: the LLC resonant converter adopts a full-bridge or half-bridge circuit topology structure, and the rectifying circuit of the LLC resonant converter adopts a full-bridge rectifying or half-bridge rectifying structure.
5. A method of implementing data modulation at the output of an LLC resonant converter as claimed in claim 1, wherein: the method also comprises a data demodulation step, which specifically comprises the following steps:
and acquiring a signal at the output end of the LLC resonant converter by using a receiver, filtering and sampling, and demodulating the transmitted data by using a DFT algorithm.
6. An LLC resonant converter system based on the method of any of claims 1-5, comprising:
and the LLC resonant converter is used for power transmission and data transmission.
And the sampling module is used for sampling the power signal of the LLC resonant converter and outputting a sampling value.
A compensation network module for compensating the sampling value and outputting frequency f0。
A band modulation module, configured to perform band modulation on data d (t) to be transmitted and output a modulation signal fd(t)。
A square-wave generator module for outputting a frequency value equal to f0+fd(t) square wave signal.
And the driving module is used for driving a switching device in the LLC resonant converter after the power amplification is carried out on the square wave signal output by the square wave generator module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545175.0A CN113098290A (en) | 2021-05-19 | 2021-05-19 | Method and system for realizing data modulation at output end of LLC resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110545175.0A CN113098290A (en) | 2021-05-19 | 2021-05-19 | Method and system for realizing data modulation at output end of LLC resonant converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113098290A true CN113098290A (en) | 2021-07-09 |
Family
ID=76664311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110545175.0A Pending CN113098290A (en) | 2021-05-19 | 2021-05-19 | Method and system for realizing data modulation at output end of LLC resonant converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113098290A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100127570A1 (en) * | 2008-11-26 | 2010-05-27 | Tigo Energy, Inc. | Systems and Methods for Using a Power Converter for Transmission of Data over the Power Feed |
| CN101719726A (en) * | 2009-12-04 | 2010-06-02 | 重庆大学 | Method and device for non-contact type synchronous transmission of energy and signal |
| CN103595145A (en) * | 2013-10-31 | 2014-02-19 | 浙江大学 | System for achieving high-speed communication and wireless energy transmission on basis of public inductive coupling |
-
2021
- 2021-05-19 CN CN202110545175.0A patent/CN113098290A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100127570A1 (en) * | 2008-11-26 | 2010-05-27 | Tigo Energy, Inc. | Systems and Methods for Using a Power Converter for Transmission of Data over the Power Feed |
| CN101719726A (en) * | 2009-12-04 | 2010-06-02 | 重庆大学 | Method and device for non-contact type synchronous transmission of energy and signal |
| CN103595145A (en) * | 2013-10-31 | 2014-02-19 | 浙江大学 | System for achieving high-speed communication and wireless energy transmission on basis of public inductive coupling |
Non-Patent Citations (1)
| Title |
|---|
| HWA-PYEONG PARK等: ""Bidirectional CLLC Resonant Converter Employing PLC Capability and EM Noise Reduction Technique for Small-Sized ESS Application"", 《IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN INDUSTRIAL ELECTRONICS》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107493119B (en) | VPPM-based direct-current bus carrier communication system utilizing power supply ripples | |
| CN112398340B (en) | Switching frequency switching and data modulation method and control system for peak current control mode | |
| CN111934443B (en) | Electric energy and signal synchronous wireless transmission method based on soft switch harmonic characteristics | |
| CN109495137A (en) | A kind of the signal coupled system and method for subsea DC power transmission cable | |
| CN110474361B (en) | Method for realizing DC/AC power conversion and power line carrier communication by sharing inverter circuit | |
| CN1161605A (en) | Communication apparatus | |
| CN113013999B (en) | Wireless electric energy and data synchronous transmission system based on direct current ripple modulation | |
| CN102624427A (en) | Synchronous transmission system of energy and information | |
| CN111725973B (en) | Frequency hopping differential phase shift keying modulation method for PWM carrier | |
| CN206962545U (en) | Radio energy transmission system | |
| CN100392963C (en) | Low voltage largecurrent modle power source | |
| CN113098290A (en) | Method and system for realizing data modulation at output end of LLC resonant converter | |
| Leng et al. | Review of coding theory and applications of switching ripple-based talkative power converters | |
| Hua et al. | A novel power and signal composite modulation strategy for CCC-based SRG in distributed microgrid | |
| CN209963957U (en) | Fixed-frequency resonant DC converter | |
| CN113055055B (en) | Method and system for realizing near field communication based on converter inductance or transformer leakage inductance | |
| CN114553263B (en) | Power line carrier communication device and method | |
| CN112345821B (en) | Commercial power voltage detection circuit and switch power supply system using same | |
| CN116827385B (en) | Power information fusion device for DC-DC converter power control loop disturbance | |
| Li et al. | A data modulation strategy based on LLC resonant converter | |
| CN114205955B (en) | Single-stage low-ripple LED driving circuit and fusion VLC modulation method | |
| NL2028295B1 (en) | Power optimizer with powerline communication | |
| CN209120179U (en) | A kind of signal coupled system of subsea DC power transmission cable | |
| CN116979804A (en) | Power data composite modulation method based on controllable rectifying resonant DC converter | |
| CN108092715A (en) | A kind of transmitting device based on LiFi light and Quick Response Code |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210709 |
|
| WD01 | Invention patent application deemed withdrawn after publication |