CN106201954B - USB isolation fiber conversion circuit - Google Patents
USB isolation fiber conversion circuit Download PDFInfo
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- CN106201954B CN106201954B CN201610721864.1A CN201610721864A CN106201954B CN 106201954 B CN106201954 B CN 106201954B CN 201610721864 A CN201610721864 A CN 201610721864A CN 106201954 B CN106201954 B CN 106201954B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/38—Universal adapter
- G06F2213/3852—Converter between protocols
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- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to a USB isolation fiber-to-fiber circuit, which comprises an auxiliary power supply circuit, a USB interface conversion circuit and an optical coupling isolation fiber-to-fiber circuit. The auxiliary power supply circuit is respectively connected with the USB interface conversion circuit and the optical coupler isolation fiber conversion circuit, and the USB interface conversion circuit is connected with the optical coupler isolation fiber conversion circuit. The beneficial effects are that: the bidirectional isolation of serial port data is completed, the isolation voltage is high, and the original communication rate is not influenced; the accuracy and the reliability of remote data transmission under special conditions such as high-voltage static electricity are ensured; the isolation conversion of USB data and serial port optical fiber data is realized, the problem of data loss caused by electrostatic discharge is solved, and the anti-interference capability is enhanced.
Description
Technical Field
The invention relates to a USB isolation fiber-to-optical circuit applied to the field of remote communication in the fields of industry, scientific research, military industry and the like.
Background
With the development of industry and military science and technology, high-voltage power supplies and high-isolation power supplies are increasingly widely applied, particularly in the aspect of remote control, and reliable transmission of remote control data is a key problem. In the existing application, the remote data transmission is realized by directly converting the optical fiber into a terminal interface. In the practical application, the method can cause sporadic data loss phenomenon, especially in high-pressure environment application. In many practice, it is found that the optical fiber cable has static electricity, and when the static electricity is accumulated to a certain voltage, the static electricity is discharged to the circuit of the connected USB part, so that the transmission data is disordered and the data is lost.
Disclosure of Invention
In view of the defects existing in the prior art, the invention provides the USB isolation fiber-to-optical circuit which is high in speed and high in remote data transmission reliability, the circuit solves the problem of data loss caused by electrostatic discharge, and the anti-interference capability of the circuit is enhanced.
The invention adopts the technical scheme that the USB isolation fiber conversion circuit comprises an auxiliary power supply circuit and a USB interface conversion circuit, and is characterized in that: the auxiliary power supply circuit is connected with the USB interface conversion circuit and the optical coupling isolation fiber conversion circuit respectively, and the USB interface conversion circuit is connected with the optical coupling isolation fiber conversion circuit;
the specific circuit connection is as follows: in the optocoupler isolation fiber-switching circuit, an anode 2 pin of a light emitting diode input by a photoelectric coupler U2 is connected with one end of a resistor R12 in a USB interface conversion circuit, a cathode 3 pin of the light emitting diode input by the photoelectric coupler U2 is connected with a data transmitting end 1 pin of an interface conversion chip U1 in the USB interface conversion circuit, a photoelectric isolation power supply end 8 pin of the photoelectric coupler U2 is respectively connected with one end of a resistor R19 and one end of a capacitor C11, an isolation auxiliary power supply positive end VG, the other end of the capacitor C11 is connected with isolation ground, a photoelectric isolation output end 6 pin of the photoelectric coupler U2 is respectively connected with one ends of a resistor R5 and R6 and the other end of the resistor R19, a photoelectric isolation ground end 5 pin of the photoelectric coupler U2 is connected with isolation ground, the other end of the resistor R6 is respectively connected with one end of a resistor R7 and the base of a triode T1, an emitter of the triode T1 is connected with the other end of the resistor R7 and then is connected with isolation ground, the isolated auxiliary power supply positive end VG is respectively connected with the other end of the resistor R5, the collector of the triode T1 and the sending input end 8 pin of the photoelectric transceiver module M2 through a resistor R4, one ends of the inductors L1 and L2 are connected and then connected with the positive electrode of the capacitor C6 in the auxiliary power supply circuit, namely, the isolated auxiliary power supply positive end VG, the other end of the inductor L1 is respectively connected with one end of the capacitor C7 and the sending power supply end 6 pin of the photoelectric transceiver module M2, the other end of the inductor L2 is respectively connected with one end of the capacitor C8 and the receiving power supply end 5 pin of the photoelectric transceiver module M2, the sending ground end 9 pin of the photoelectric transceiver module M2 is connected with the receiving ground end 1 pin and then connected with the isolation ground, one ends of the resistors R9 and R10 are connected and then connected with the receiving output end 2 pin of the photoelectric transceiver module M2, the other end of the resistor R10 is respectively connected with one end of the resistor R11 and the base of the triode T2, the emitter of the triode T2 is connected with the other end of the resistor R11 and then is grounded in an isolated manner, the isolated auxiliary power supply positive end VG is respectively connected with the collector of the triode T2, the other end of the resistor R9 and the cathode 3 pin of the photoelectric coupler U3 input light-emitting diode through the resistor R8, the anode 2 pin of the photoelectric coupler U3 input light-emitting diode is connected with the isolated auxiliary power supply positive end VG through the resistor R20, the photoelectric isolated output end 6 pin of the photoelectric coupler U3 is connected with the data receiving end 5 pin of the interface conversion chip U1 in the USB interface conversion circuit, the photoelectric isolated power supply end 8 pin of the photoelectric coupler U3 is connected with the positive electrode VDD end of the capacitor C1 in the auxiliary power supply circuit, and the photoelectric isolated grounding end 5 pin of the photoelectric coupler U3 is connected with the input ground GND.
The beneficial effects of the invention are as follows: the bidirectional isolation of serial port data is completed, the isolation voltage is high, and the original communication rate is not affected. The accuracy and the reliability of remote data transmission under special conditions such as high-voltage static electricity are ensured. The isolation conversion of USB data and serial port optical fiber data is realized, the problem of data loss caused by electrostatic discharge is solved, and the anti-interference capability is enhanced.
Drawings
FIG. 1 is a connection block diagram of a power supply circuit of the present invention;
fig. 2 is a schematic diagram of a power supply circuit of the present invention.
Detailed Description
As shown in fig. 1 and 2, the USB isolation fiber-optic conversion circuit includes an auxiliary power supply circuit, a USB interface conversion circuit, and an optical coupling isolation fiber-optic conversion circuit.
The auxiliary power supply circuit is respectively connected with the USB interface conversion circuit and the optical coupler isolation fiber conversion circuit, and the USB interface conversion circuit is connected with the optical coupler isolation fiber conversion circuit.
In the optical coupling isolation fiber conversion circuit, an anode 2 pin of a light emitting diode input by a photoelectric coupler U2 is connected with one end of a resistor R12 in a USB interface conversion circuit, a cathode 3 pin of the light emitting diode input by the photoelectric coupler U2 is connected with a data transmitting end 1 pin of an interface conversion chip U1 in the USB interface conversion circuit, a photoelectric isolation power supply end 8 pin of the photoelectric coupler U2 is respectively connected with one end of a resistor R19 and one end of a capacitor C11, an isolation auxiliary power supply positive end VG, the other end of the capacitor C11 is connected with an isolation ground, a photoelectric isolation output end 6 pin of the photoelectric coupler U2 is respectively connected with one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R19 is connected with an isolation ground, the other end of the resistor R6 is respectively connected with one end of a resistor R7 and the base of a triode T1, an emitter of the triode T1 is connected with the other end of the resistor R7 and then is connected with the isolation ground, the isolated auxiliary power supply positive end VG is respectively connected with the other end of the resistor R5, the collector of the triode T1 and the sending input end 8 pin of the photoelectric transceiver module M2 through a resistor R4, one ends of the inductors L1 and L2 are connected and then connected with the positive electrode of the capacitor C6 in the auxiliary power supply circuit, namely, the isolated auxiliary power supply positive end VG, the other end of the inductor L1 is respectively connected with one end of the capacitor C7 and the sending power supply end 6 pin of the photoelectric transceiver module M2, the other end of the inductor L2 is respectively connected with one end of the capacitor C8 and the receiving power supply end 5 pin of the photoelectric transceiver module M2, the sending ground end 9 pin of the photoelectric transceiver module M2 is connected with the receiving ground end 1 pin and then connected with the isolation ground, one ends of the resistors R9 and R10 are connected and then connected with the receiving output end 2 pin of the photoelectric transceiver module M2, the other end of the resistor R10 is respectively connected with one end of the resistor R11 and the base of the triode T2, the emitter of the triode T2 is connected with the other end of the resistor R11 and then is grounded in an isolated manner, the isolated auxiliary power supply positive end VG is respectively connected with the collector of the triode T2, the other end of the resistor R9 and the cathode 3 pin of the photoelectric coupler U3 input light-emitting diode through the resistor R8, the anode 2 pin of the photoelectric coupler U3 input light-emitting diode is connected with the isolated auxiliary power supply positive end VG through the resistor R20, the photoelectric isolated output end 6 pin of the photoelectric coupler U3 is connected with the data receiving end 5 pin of the interface conversion chip U1 in the USB interface conversion circuit, the photoelectric isolated power supply end 8 pin of the photoelectric coupler U3 is connected with the positive electrode VDD end of the capacitor C1 in the auxiliary power supply circuit, and the photoelectric isolated grounding end 5 pin of the photoelectric coupler U3 is connected with the input ground GND.
The model of the interface conversion chip U1 is as follows: FT232RL.
The model of the photoelectric coupler U2 is as follows: 6N137.
The model of the DC/DC power module M1 is as follows: IB0505LS-1W.
The model of the photoelectric transceiver module M2 is as follows: NU211132.
The components with high precision and low temperature drift are selected, the photoelectric coupler U2 is selected to have the isolation withstand voltage and the transmission rate, and the selection requirements of the DC/DC conversion power supply module M1 are as follows: high conversion efficiency, small volume and good voltage stabilizing performance.
Principle of operation
In the auxiliary power supply circuit, power is directly supplied from the 1 pin of the USB interface J1, current is limited through protection of the thermistor R1, and direct-current voltage of about 5V is obtained after input and filtration of the capacitors C1-C3. The power supply circuit supplies power for the USB interface conversion circuit on one hand, and provides input voltage VDD for the isolated DC/DC power supply module M1 on the other hand, and the isolated DC voltage output VG with high withstand voltage is obtained through filtering of a capacitor C6 by the power supply conversion module and is used as the power supply voltage of the optical isolation fiber conversion circuit.
In the USB interface conversion circuit, the model of the interface conversion chip U1 is FT232RL, and the USB interface conversion circuit has the characteristics of wide temperature range, high speed, stable transmission and the like. When the device starts to work, the device is connected with a computer end in a butt joint way through a USB port, and data transmission is waited. When data is sent out from a computer end, the interface conversion chip U1 converts the data into serial format data so as to adapt to serial communication; when data is sent from the isolated optical fiber end, the interface conversion chip U1 converts the data into USB format data after passing through the optical coupling isolation circuit so as to adapt to USB communication.
In the optocoupler isolation fiber-switching circuit, on one hand, data sent by a USB interface conversion circuit is received from the input end of an optocoupler U2, is transmitted to the output side of the U2 through optical isolation, is sent to the pin 8 of the sending input end of an optocoupler transceiver module M2 after passing through a level conversion circuit formed by a triode T1 and the like, and is sent out through an optical fiber; on the other hand, the data information from the optical fiber is received, and is output from the pin 2 of the receiving output end of the photoelectric transceiver module M2, and after passing through a level conversion circuit formed by a triode T2 and the like, the data is sent to the input end of the photoelectric coupler U3, and is sent to the pin 5 of the data receiving end of the interface conversion chip U1 in the USB interface conversion circuit through optical isolation, so that bidirectional isolation transmission of serial data is completed.
Claims (1)
1. The utility model provides a USB keeps apart changes fiber circuit, includes auxiliary power supply circuit, USB interface conversion circuit, its characterized in that: the auxiliary power supply circuit is connected with the USB interface conversion circuit and the optical coupling isolation fiber conversion circuit respectively, and the USB interface conversion circuit is connected with the optical coupling isolation fiber conversion circuit;
the specific circuit connection is as follows: in the optocoupler isolation fiber-switching circuit, an anode 2 pin of a light emitting diode input by a photoelectric coupler U2 is connected with one end of a resistor R12 in a USB interface conversion circuit, a cathode 3 pin of the light emitting diode input by the photoelectric coupler U2 is connected with a data transmitting end 1 pin of an interface conversion chip U1 in the USB interface conversion circuit, a photoelectric isolation power supply end 8 pin of the photoelectric coupler U2 is respectively connected with one end of a resistor R19 and one end of a capacitor C11, an isolation auxiliary power supply positive end VG, the other end of the capacitor C11 is connected with isolation ground, a photoelectric isolation output end 6 pin of the photoelectric coupler U2 is respectively connected with one ends of a resistor R5 and R6 and the other end of the resistor R19, a photoelectric isolation ground end 5 pin of the photoelectric coupler U2 is connected with isolation ground, the other end of the resistor R6 is respectively connected with one end of a resistor R7 and the base of a triode T1, an emitter of the triode T1 is connected with the other end of the resistor R7 and then is connected with isolation ground, the isolated auxiliary power supply positive end VG is respectively connected with the other end of the resistor R5, the collector of the triode T1 and the sending input end 8 pin of the photoelectric transceiver module M2 through a resistor R4, one ends of the inductors L1 and L2 are connected and then connected with the positive electrode of the capacitor C6 in the auxiliary power supply circuit, namely, the isolated auxiliary power supply positive end VG, the other end of the inductor L1 is respectively connected with one end of the capacitor C7 and the sending power supply end 6 pin of the photoelectric transceiver module M2, the other end of the inductor L2 is respectively connected with one end of the capacitor C8 and the receiving power supply end 5 pin of the photoelectric transceiver module M2, the sending ground end 9 pin of the photoelectric transceiver module M2 is connected with the receiving ground end 1 pin and then connected with the isolation ground, one ends of the resistors R9 and R10 are connected and then connected with the receiving output end 2 pin of the photoelectric transceiver module M2, the other end of the resistor R10 is respectively connected with one end of the resistor R11 and the base of the triode T2, the emitter of the triode T2 is connected with the other end of the resistor R11 and then is grounded in an isolated manner, the isolated auxiliary power supply positive end VG is respectively connected with the collector of the triode T2, the other end of the resistor R9 and the cathode 3 pin of the photoelectric coupler U3 input light-emitting diode through the resistor R8, the anode 2 pin of the photoelectric coupler U3 input light-emitting diode is connected with the isolated auxiliary power supply positive end VG through the resistor R20, the photoelectric isolated output end 6 pin of the photoelectric coupler U3 is connected with the data receiving end 5 pin of the interface conversion chip U1 in the USB interface conversion circuit, the photoelectric isolated power supply end 8 pin of the photoelectric coupler U3 is connected with the positive electrode VDD end of the capacitor C1 in the auxiliary power supply circuit, and the photoelectric isolated grounding end 5 pin of the photoelectric coupler U3 is connected with the input ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610721864.1A CN106201954B (en) | 2016-08-25 | 2016-08-25 | USB isolation fiber conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610721864.1A CN106201954B (en) | 2016-08-25 | 2016-08-25 | USB isolation fiber conversion circuit |
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| Publication Number | Publication Date |
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| CN106201954A CN106201954A (en) | 2016-12-07 |
| CN106201954B true CN106201954B (en) | 2023-07-25 |
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| CN201610721864.1A Active CN106201954B (en) | 2016-08-25 | 2016-08-25 | USB isolation fiber conversion circuit |
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| CN113849441A (en) * | 2021-10-29 | 2021-12-28 | 安天科技集团股份有限公司 | Data transmission method and equipment for protecting high-voltage discharge |
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| CN101771355A (en) * | 2010-02-05 | 2010-07-07 | 天津市东文高压电源厂 | Fixed-output isolation high-voltage power supply module |
| CN103633876A (en) * | 2013-12-19 | 2014-03-12 | 东文高压电源（天津）有限公司 | Isolation-control bipolar high-frequency high-voltage pulse power supply circuit |
| US8766221B1 (en) * | 2010-04-30 | 2014-07-01 | Power-One, Inc. | Isolation system for a bi-directional communication bus line |
| CN105337483A (en) * | 2014-08-07 | 2016-02-17 | 中兴通讯股份有限公司 | Device for preventing current from flowing backwards |
| CN105790554A (en) * | 2016-04-06 | 2016-07-20 | 杭州电子科技大学 | IGBT circuit having dual-isolation characteristic and control method thereof |
| CN206178789U (en) * | 2016-08-25 | 2017-05-17 | 东文高压电源（天津）股份有限公司 | USB keeps apart changes optic fibre circuit |
-
2016
- 2016-08-25 CN CN201610721864.1A patent/CN106201954B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771355A (en) * | 2010-02-05 | 2010-07-07 | 天津市东文高压电源厂 | Fixed-output isolation high-voltage power supply module |
| US8766221B1 (en) * | 2010-04-30 | 2014-07-01 | Power-One, Inc. | Isolation system for a bi-directional communication bus line |
| CN103633876A (en) * | 2013-12-19 | 2014-03-12 | 东文高压电源（天津）有限公司 | Isolation-control bipolar high-frequency high-voltage pulse power supply circuit |
| CN105337483A (en) * | 2014-08-07 | 2016-02-17 | 中兴通讯股份有限公司 | Device for preventing current from flowing backwards |
| CN105790554A (en) * | 2016-04-06 | 2016-07-20 | 杭州电子科技大学 | IGBT circuit having dual-isolation characteristic and control method thereof |
| CN206178789U (en) * | 2016-08-25 | 2017-05-17 | 东文高压电源（天津）股份有限公司 | USB keeps apart changes optic fibre circuit |
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| CN106201954A (en) | 2016-12-07 |
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