CN112217401A - Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter - Google Patents
Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter Download PDFInfo
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- CN112217401A CN112217401A CN202011036850.9A CN202011036850A CN112217401A CN 112217401 A CN112217401 A CN 112217401A CN 202011036850 A CN202011036850 A CN 202011036850A CN 112217401 A CN112217401 A CN 112217401A
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- China
- Prior art keywords
- magnetic isolation
- slave
- chip
- main
- power supply
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- 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.)
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Classifications
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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- 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
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- 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
Abstract
The invention discloses a magnetic isolation power supply communication scheme based on a digital modulation technology for an electric energy meter. The circuit comprises a main end MCU, a main end magnetic isolation driving chip, a magnetic isolation transformer, a slave end chip and a peripheral circuit thereof. The circuit realizes the power supply of the master end to the slave end through the magnetic isolation transformer and the two-way communication with the slave end through the frequency modulation and amplitude modulation of signals, saves the inconvenience of simultaneously supplying power to the two isolation ends, and realizes the signal circulation from the slave end chip to the master end MCU. The invention utilizes the digital modulation technology and the isolation characteristic and the energy and information transmission characteristic of the magnetic isolation transformer, ensures the safety of equipment and electricity utilization, expands the application direction of the magnetic isolation communication circuit, and simplifies the design difficulty of two aspects of hardware circuit and program.
Description
Technical Field
The invention relates to a magnetic isolation power supply communication scheme based on a digital modulation technology for an electric energy meter.
Background
Digital modulation techniques, i.e., digital circuit signal modulation. Modulation is the process of processing the encoded information from a signal source into a form suitable for transmission, i.e., converting the baseband signal (source) into a band-pass signal of very high frequency relative to the baseband frequency. This is typically accomplished by causing the high frequency carrier to change the amplitude, phase or frequency of the carrier as the signal amplitude changes.
Magnetic isolation is a magnetically coupled isolator based on magnetic isolation technology. It encodes the input logic transitions using 1ns pulses transmitted to the primary side of a given transformer, which are coupled from the primary to the secondary of the transformer and detected by the secondary side circuitry. The circuit then recovers the input digital signal at the output. Finally, data communication is performed in this way.
Disclosure of Invention
The invention aims to provide a magnetic isolation power supply communication scheme based on a digital modulation technology for an electric energy meter. The communication, power supply and isolation requirements in practical application are fully considered, and on the basis of the magnetic isolation transformer, a digital modulation technology is used to realize data communication from the end chip to the main end MCU, and the inconvenience that two sides of isolation need to be electrified simultaneously is avoided.
The power supply communication circuit is connected with the main end magnetic isolation driving chip through the main end MCU, the main end magnetic isolation driving chip is connected with the magnetic isolation transformer, and the magnetic isolation transformer is connected with the slave end chip. The main end MCU and the main end magnetic isolation driving chip can directly communicate through the UART. Through the magnetic isolation transformer, the master end magnetic isolation driving chip supplies power to the slave end chip, performs data communication between the master end and the slave end, and realizes electrical isolation between the master end and the slave end. As shown in fig. 1.
The main end refers to an electric network connected with the main end MCU and the main end magnetic isolation driving chip.
The slave is an electrical network connected to the slave chip.
The main end magnetic isolation driving chip comprises a digital interface module, a digital demodulation module, a magnetic isolation driving module, an internal clock and an FSK modulation module.
The magnetic isolation transformer realizes power supply of the master end to the slave end and signal transmission of the master end and the slave end through electromagnetic conversion.
The slave end chip comprises a rectification voltage stabilization module, an amplitude modulation module and a digital demodulation module.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Detailed Description
As shown in FIG. 1, after the main terminal magnetic isolation driving chip is powered externally, the main terminal magnetic isolation driving chip starts to work, and a driving signal with the frequency of f3 is provided for the magnetic isolation transformer and the slave terminal through an internal clock and a driving circuit. The slave end chip changes the current amplitude of the driving signal in an amplitude modulation mode, and the master end magnetic isolation driving chip transmits data transmitted by the slave end chip to the master end MCU through UART (universal asynchronous receiver transmitter) by detecting the current amplitude of the driving signal and performing digital demodulation. The main end MCU replies data to the main end magnetic isolation driving chip through the UART, the main end magnetic isolation driving chip changes the signal frequency of the driving magnetic isolation transformer and the slave end chip through frequency modulation, and the slave end chip demodulates the transmitted data from the driving signals with different frequencies.
Wherein, the high and low levels of the current amplitude of the driving signal with the frequency f3 represent binary bits 1 and 0 sent from the terminal respectively; the driving signals of frequencies f1 and f2 represent binary bits 1 and 0 respectively transmitted from the master terminal to the slave terminal.
The magnetic isolation transformer realizes the electrical isolation of the main end and the slave end through a winding of which the two ends are not electrically connected. The windings realize the transmission of electric energy and signals through electromagnetic induction.
The main end MCU and the main end magnetic isolation driving chip carry out data transmission through the UART, so that the requirement on the number of chip pins can be reduced, and the time sequence requirement of communication can be simplified.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A magnetic isolation power supply communication scheme based on a digital modulation technology for an electric energy meter is characterized in that: a. the circuit consists of a main end MCU, a main end magnetic isolation driving chip, a magnetic isolation transformer and a slave end chip. b. The master end is electrically isolated from the slave end. c. The main end supplies power to the slave end, and the slave end does not need an external power supply. d. The slave end transmits data to the master end through amplitude modulation, and the master end transmits data to the slave end through frequency modulation. e. The main end magnetic isolation driving chip is communicated with the main end MCU through the UART.
2. The main end magnetic isolation driving chip of claim 1, which has frequency modulation, digital demodulation and power output functions. And the slave end chip internally integrates rectification voltage stabilization, frequency demodulation, amplitude modulation and ADC (analog to digital converter) sampling or 485 communication functions.
3. The electrical isolation of the master and the slave according to claim 1 means that no direct current flow path is established between the network connected to the master magnetic isolation driving chip and the network connected to the slave chip, but signals or energy can still be transmitted.
4. The slave unit according to claim 1, wherein the slave unit does not need an external power supply, the master terminal supplies power to the slave unit through the magnetic isolation transformer, and the slave terminal obtains energy from the signal transmitted by the magnetic isolation transformer through rectification and voltage stabilization without using an external power supply.
5. The frequency modulation of claim 1 is characterized in that the main magnetic isolation chip can switch the output signal among at least 3 different frequencies. Amplitude modulation means that the slave chip can change the amplitude of a signal.
6. The main-end MCU chip and the main-end magnetic isolation driving chip of claim 1 have UART communication function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011036850.9A CN112217401A (en) | 2020-09-28 | 2020-09-28 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011036850.9A CN112217401A (en) | 2020-09-28 | 2020-09-28 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112217401A true CN112217401A (en) | 2021-01-12 |
Family
ID=74052648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011036850.9A Withdrawn CN112217401A (en) | 2020-09-28 | 2020-09-28 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112217401A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462134A (en) * | 2021-01-20 | 2021-03-09 | 青岛鼎信通讯股份有限公司 | Three-phase electric energy meter based on magnetic isolation technology |
| CN115112947A (en) * | 2022-07-26 | 2022-09-27 | 青岛鼎信通讯股份有限公司 | Electric energy meter, communication method, device and medium of metering chip and MCU |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100109445A1 (en) * | 2008-09-27 | 2010-05-06 | Kurs Andre B | Wireless energy transfer systems |
| CN108199821A (en) * | 2017-09-27 | 2018-06-22 | 青岛鼎信通讯股份有限公司 | A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply |
| CN208334496U (en) * | 2018-04-27 | 2019-01-04 | 北京智芯微电子科技有限公司 | Sampling with high precision circuit |
| CN109406873A (en) * | 2018-12-11 | 2019-03-01 | 上海贝岭股份有限公司 | Electric energy computation chip and intelligent electric meter |
| CN109995392A (en) * | 2017-12-28 | 2019-07-09 | 上海胤祺集成电路有限公司 | Magnetic coupling communication transceiver, magnetic coupling communication master chip and magnetic coupling communication system |
| CN210487961U (en) * | 2019-05-14 | 2020-05-08 | 广西天湖计量检测有限公司 | Online analog-digital circuit full-isolation electric energy meter calibrator |
-
2020
- 2020-09-28 CN CN202011036850.9A patent/CN112217401A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100109445A1 (en) * | 2008-09-27 | 2010-05-06 | Kurs Andre B | Wireless energy transfer systems |
| CN108199821A (en) * | 2017-09-27 | 2018-06-22 | 青岛鼎信通讯股份有限公司 | A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply |
| CN109995392A (en) * | 2017-12-28 | 2019-07-09 | 上海胤祺集成电路有限公司 | Magnetic coupling communication transceiver, magnetic coupling communication master chip and magnetic coupling communication system |
| CN208334496U (en) * | 2018-04-27 | 2019-01-04 | 北京智芯微电子科技有限公司 | Sampling with high precision circuit |
| CN109406873A (en) * | 2018-12-11 | 2019-03-01 | 上海贝岭股份有限公司 | Electric energy computation chip and intelligent electric meter |
| CN210487961U (en) * | 2019-05-14 | 2020-05-08 | 广西天湖计量检测有限公司 | Online analog-digital circuit full-isolation electric energy meter calibrator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462134A (en) * | 2021-01-20 | 2021-03-09 | 青岛鼎信通讯股份有限公司 | Three-phase electric energy meter based on magnetic isolation technology |
| CN115112947A (en) * | 2022-07-26 | 2022-09-27 | 青岛鼎信通讯股份有限公司 | Electric energy meter, communication method, device and medium of metering chip and MCU |
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Application publication date: 20210112 |