CN108199821A - A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply - Google Patents
A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply Download PDFInfo
- Publication number
- CN108199821A CN108199821A CN201710916013.7A CN201710916013A CN108199821A CN 108199821 A CN108199821 A CN 108199821A CN 201710916013 A CN201710916013 A CN 201710916013A CN 108199821 A CN108199821 A CN 108199821A
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- Prior art keywords
- chip
- circuit
- isolation
- magnetic coupling
- isolated
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- 238000002955 isolation Methods 0.000 title claims abstract description 42
- 238000010168 coupling process Methods 0.000 title claims abstract description 38
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 38
- 230000008878 coupling Effects 0.000 title claims abstract description 36
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
-
- 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
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a kind of magnetic coupling half duplex communication integrated circuits of band isolation power supply.The integrated circuit is divided into magnetic coupling isolation master chip and the isolation of magnetic coupling from chip two parts.It is connected between master and slave chip by magnetic coupling transformer, the UART interface of master chip digital interface and MCU connect, and are connect from chip digital interface with being isolated circuit.Magnetic coupling isolation master chip is internally integrated modulation /demodulation module, and the isolation of magnetic coupling integrates modulation /demodulation module and current rectifying and wave filtering circuit from chip interior.The present invention utilizes the electrical isolation characteristic of coupling transformer, using technologies such as modulation /demodulation and rectifying and wave-filterings, it is intended to realize MCU and be isolated the electrical isolation of communication and power supply between circuit.Being isolated circuit using the typical case of the present invention has 485 chip circuits of RS and computation chip circuit.
Description
Technical field：
The present invention relates to a kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply, this circuit utilizes transformer magnetic coupling
Principle is closed, by the modulation-demodulation technique of magnetic coupling isolating chip and rectifying and wave-filtering technology, MCU is realized and is isolated between circuit
Communication and the electrical isolation of power supply；Typical case, which is isolated circuit, RS-485 chip circuits and computation chip circuit.
Background technology：
Interfering with each other between the effect of the electrical isolation mainly different circuits of reduction two.With RS-485 chip circuits and
It is illustrated for computation chip circuit：RS-485 buses are there are interference such as probabilistic overvoltage, overcurrent and noises, to ensure
The stability of safety and the communication of system, needs to carry out electrical isolation to main MCU circuits and RS-485 chip circuits；Metering
Circuit has the characteristics that sampled signal accuracy class is high, electromagnetic immunity EMS requirements are high, to ensure the accuracy of metering and reliable
Property, circuits other with system is needed to carry out electrical isolation.
Existing common electrical isolation circuit is made of optocoupler and DC-DC converter, photoelectric coupled circuit can realize communication every
From DC-DC converter circuit can be realized for being electrically isolated；But this isolation circuit peripheral circuit is complicated, and cost is higher.
Invention content：
The present invention is a kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply.
The technical scheme is that utilize magnetic coupling half duplex communication integrated circuit and coupling transformer with isolation power supply
Realize that MCU asks being isolated for communication and power supply with being isolated circuit.It is characterized in that：MCU and being isolated between circuit is passed sequentially through
Master chip, coupling transformer and being established from chip connects, using the electrical isolation characteristic of coupling transformer, using modulation /demodulation and
The technologies such as rectifying and wave-filtering realize MCU and the electrical isolation being isolated between circuit.
The electrical isolation, including communication isolation and for being electrically isolated.Communication isolation refers to through magnetic coupling isolating chip and change
Depressor transmitting digital signals realize digital communication；Refer to that magnetic coupling is provided every master chip by transformer to from chip for being electrically isolated
Electric energy.
The MCU, it is desirable that there is UART interface or can UART functions be simulated by GPIO.
The coupling transformer, it is characterized in that, primary coil and secondary coil are not connected directly, and are only carried out by magnetic circuit
Coupling.
Described is isolated circuit, refers to that needs carry out the circuit of electrical isolation with MCU, typical circuit has RS-485 cores
Piece circuit and computation chip circuit.
The magnetic coupling isolation master chip, it is characterized in that, realize that digital signal is sent using frequency modulating technology；Using electricity
It flows demodulation techniques and realizes digital signal reception；It is integrated into MCU using integrated circuit technique.
The magnetic coupling is isolated from chip, it is characterized in that：Digital signal reception is realized using frequency demodulation technique；Using electricity
Modulation technology digital signal is flowed to send；It is realized and powered using rectifying and wave-filtering technology；It is integrated into using integrated circuit technique
In isolation circuit.
Description of the drawings
Fig. 1：The system block diagram of electrical isolation is realized based on magnetic coupling.
Fig. 2：The integrated schematic block circuit diagram of magnetic coupling isolation.
Specific embodiment：
The specific embodiment of the present invention is described in further detail below according to attached drawing.
If Fig. 1 is the system block diagram based on magnetic coupling realization electrical isolation.It is listed in figure and is isolated circuit RS- in typical case
The system block diagram applied on 485 chip circuits and computation chip circuit, below to both circuit system operation principles point
It is not introduced：(1) applied to RS-485 chip circuits：Between MCU and RS-485 chips by master chip-coupling transformer-
It is sequentially connected from chip；Digital communication is carried out by serial ports between MCU and master chip；Master chip is coupled with from passing through between chip
Transformer is modulated signal interaction, and master and slave chip realizes the transmitting-receiving of modulated signal each by internal modulation /demodulation module；
In addition, the AC modulated signals on coupling transformer are carried out with rectifying and wave-filtering from the current rectifying and wave filtering circuit of chip interior, output is straight
Galvanic electricity source powers to from chip lateral circuit；Digital communication is carried out by serial ports between chip and RS-485 chip circuits, so far
Realize that MCU is isolated with the communication of RS-485 chip circuits and for being electrically isolated；(2) applied to computation chip circuit：MCU and metering core
Be sequentially connected between piece by master chip-coupling transformer-from chip, MCU to circuit theory from chip this part with
The application of RS-485 chip circuits is consistent, and digital communication is carried out by serial ports between chip and metering circuit, so far realize MCU with
The communication of computation chip circuit is isolated and for being electrically isolated.
If Fig. 2 is the integrated schematic block circuit diagram of magnetic coupling isolation, master chip is listed in figure and from chip interior functional block diagram,
It is introduced respectively to master chip and from chip operation process below：(1) it is as follows to send and receive function realization method for master chip,
Oscillator generates 3 kinds of frequency signals f1, f2, f3, represents send state TxD=0 respectively, sends state TxD=1 and receive state, cooperation
Signal is controlled to send state CON=1, receive state CON=0, isolating transformer is sent to after frequency signal is amplified by power amplifier, it is real
The sending function of existing master chip；When master chip is in reception state, current discriminator is demodulated by differentiating to the electric current for flowing through power amplifier
Go out the current modulated sent from chip, realize the receive capabilities of master chip；(2) function realization method is transmitted/received such as from chip
Under：Discriminating controller identifies frequency signal f1, f2, f3 of master chip transmission by frequency discrimination, can determine whether master chip working condition；When
When master chip is sends state, from the frequency discriminator of chip by demodulation of frequency discriminator signal, the receive capabilities from chip are realized；Work as master chip
During to receive state, starting constant current switch from chip, current-modulation is carried out to digital signal and being sent to master chip, realize from chip
Sending function；(3) it is as follows that realization method of powering is isolated from chip, rectification is carried out to AC signal from chip rectification filtering module
Filtering, output DC power supply VCC/GND are to power from chip lateral circuit, realize the isolation function of supplying power from chip.
Claims (7)
1. a kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply, it is characterised in that：MCU and be isolated between circuit according to
It is secondary that master chip, coupling transformer and the isolation of magnetic coupling are isolated from chip foundation connection by magnetic coupling, utilize the electrical of coupling transformer
Isolation characteristic realizes MCU and the electrical isolation being isolated between circuit using technologies such as modulation /demodulation and rectifying and wave-filterings.
2. electrical isolation as described in claim 1, it is characterized in that, including communication isolation and for being electrically isolated.
3. MCU as described in claim 1, it is characterized in that, there is UART interface.
4. coupling transformer as described in claim 1, it is characterized in that, primary coil and secondary coil are not connected directly, only logical
Magnetic circuit is crossed to be coupled.
5. circuit is isolated as described in claim 1, it is characterized in that, it needs to carry out the circuit of electrical isolation, typical quilt with MCU
Isolation circuit has RS-485 chip circuits and computation chip circuit.
6. magnetic coupling isolation master chip as described in claim 1, abbreviation master chip, it is characterized in that, using frequency modulating technology reality
Existing digital signal is sent, and realizes digital signal reception using electric current demodulation techniques, MCU is integrated into using integrated circuit technique
In.
7. magnetic coupling as described in claim 1 isolation is from chip, referred to as from chip, it is characterized in that：Using frequency demodulation technique reality
Existing digital signal reception realizes that digital signal is sent using current-modulation technology, power supply is realized using rectifying and wave-filtering technology, can profit
It is integrated into isolation circuit with integrated circuit technique.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710916013.7A CN108199821A (en) | 2017-09-27 | 2017-09-27 | A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710916013.7A CN108199821A (en) | 2017-09-27 | 2017-09-27 | A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108199821A true CN108199821A (en) | 2018-06-22 |
Family
ID=62572834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710916013.7A Pending CN108199821A (en) | 2017-09-27 | 2017-09-27 | A kind of magnetic coupling half duplex communication integrated circuit of band isolation power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108199821A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109166298A (en) * | 2018-09-02 | 2019-01-08 | 青岛鼎信通讯科技有限公司 | Electric energy meter of new generation based on the communication of magnetic coupling and single channel power supply export technique |
| CN110392091A (en) * | 2019-03-06 | 2019-10-29 | 苏州工业职业技术学院 | A/D acquisition card based on NB-iot technology |
| CN112217401A (en) * | 2020-09-28 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
| CN112234976A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | 485 communication circuit based on magnetic isolation technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130370A (en) * | 2016-08-22 | 2016-11-16 | 武汉盛帆电子股份有限公司 | Communicator copied by Switching Power Supply and electrical isolation method, multilist collection |
| US20170070354A1 (en) * | 2015-09-09 | 2017-03-09 | Stmicroelectronics S.R.L. | A method of transmitting power and data across a galvanic isolation barrier, corresponding system and apparatus |
| CN106685211A (en) * | 2016-08-22 | 2017-05-17 | 武汉盛帆电子股份有限公司 | Switching power supply and electrical isolation method, ammeter |
-
2017
- 2017-09-27 CN CN201710916013.7A patent/CN108199821A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170070354A1 (en) * | 2015-09-09 | 2017-03-09 | Stmicroelectronics S.R.L. | A method of transmitting power and data across a galvanic isolation barrier, corresponding system and apparatus |
| CN106130370A (en) * | 2016-08-22 | 2016-11-16 | 武汉盛帆电子股份有限公司 | Communicator copied by Switching Power Supply and electrical isolation method, multilist collection |
| CN106685211A (en) * | 2016-08-22 | 2017-05-17 | 武汉盛帆电子股份有限公司 | Switching power supply and electrical isolation method, ammeter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109166298A (en) * | 2018-09-02 | 2019-01-08 | 青岛鼎信通讯科技有限公司 | Electric energy meter of new generation based on the communication of magnetic coupling and single channel power supply export technique |
| CN110392091A (en) * | 2019-03-06 | 2019-10-29 | 苏州工业职业技术学院 | A/D acquisition card based on NB-iot technology |
| CN112234976A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | 485 communication circuit based on magnetic isolation technology |
| CN112217401A (en) * | 2020-09-28 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Magnetic isolation power supply communication scheme based on digital modulation technology for electric energy meter |
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