CN102855211A - Universal serial bus-balanced voltage digital interface converter - Google Patents
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Abstract
The invention provides a universal serial bus-balanced voltage digital interface converter. The universal serial bus-balanced voltage digital interface converter comprises a USB interface unit, a USB-serial signal converting unit, an RS-422 signal processing unit, an RS-422 interface and a signal isolating unit. The signal isolating unit is arranged between the USB-serial signal converting unit and the RS-422 signal processing unit and used for electrically isolating a signal between the USB-serial signal converting unit and the RS-422 signal processing unit. By means of the technical isolation scheme, compared with the prior art and on the premise that a normal communication function and the signal transmission quality are guaranteed, the electrical connection between a computer and a programmable logic controller (PLC) on a signal transmission line is switched off, and accordingly the stoppage that a communication chip is burned down due to electricity leakage is completely eradicated.
Description
Technical field
The present invention relates to signal isolation field, relate in particular a kind of USB (universal serial bus)-balanced voltage digital interface converter.
Background technology
PLC (Programmable Logic Controller, programmable logic controller (PLC)) is a kind of widely used industrial automation control appliance.The signal that it can process input PLC sends the operation that corresponding output signal is come opertaing device according to the program that is stored in wherein.Because no matter its program can fully by user's establishment, so PLC has extremely strong dirigibility, thereby be in single plane automation, or the robotization of whole production line, and even the production automation of whole factory, PLC is bearing important effect, and by a large amount of practice.
The most important characteristic of PLC is to be programmed by the user, PLC product now, all be that special software programs above using PC (PC), then by an interface PC and PLC are connected, and carry out communicating by letter between PC and the PLC by above-mentioned interface, be convey program and data, and the state of monitoring PLC.The interface that PLC end is used for finishing this task is balanced voltage digital interface (Balanced Voltage Digital Interface) normally, because it meets the ANSI/TIA/EIA-422-B standard, also is called RS-422.Owing to all be not equipped with this interface on the common PC, therefore usually need to be equipped with a USB (Universal Serial Bus, USB (universal serial bus)) and be connected PC and PLC with the converter of RS-422.
Many common USBRS-422 converters are arranged in the market, adopt a chips (for example PL2303, CP2102, FT232 etc.) as the conversion of communication format, to be aided with a small amount of peripheral components, realize the most basic communication function.
In the existing generic USB RS-422 converter, USB end (usb interface unit) is held between (RS-422 interface unit) with RS-422 and is connected with the RS-422 signal processing unit by USB-serial signal converting unit, concrete, turning serial port chip by a USB directly links to each other with a RS-422 transceiving chip, because USB turns serial port chip and directly links to each other with the RS-422 transceiving chip, having path on electric exists, so work as in USB or RS-422 one end because static discharge, electric leakage appears in short circuit or other reason, during the situations such as electric voltage exception, the semiconductor electronic part will breakdown conducting, form current path between the two ends, will burn electronic component on the path in the short time at the utmost point like this, this is wherein especially fragile with the communication chip among the PLC, the easiest to be damaged, in case PLC damages, and will cause PLC to communicate by letter with PC.
Summary of the invention
In view of this, the invention provides a kind of USB (universal serial bus)-balanced voltage digital interface converter, in order to solve easily breakdown problem of the communication chip among the PLC in the prior art.
For achieving the above object, the invention provides following technical scheme:
A kind of USB (universal serial bus)-balanced voltage digital interface converter, comprise usb interface unit, USB-serial signal converting unit, RS-422 signal processing unit and RS-422 interface, also comprise the signal isolated location, described signal isolated location places between described USB-serial signal converting unit and the described RS-422 signal processing unit, is used for the signal between electrical isolation described USB-serial signal converting unit and the described RS-422 signal processing unit.
Preferably, in above-mentioned USB (universal serial bus)-balanced voltage digital interface converter, described signal isolated location comprises first signal isolated location and secondary signal isolated location;
The input end of described first signal isolated location is connected with described USB-serial signal converting unit, the output terminal of described first signal isolated location is connected with described RS-422 signal processing unit, and described first signal isolated location is used for the signal of electrical isolation from described USB-serial signal converting unit to described RS-422 signal processing unit direction transmission;
The input end of described secondary signal isolated location is connected with described RS-422 signal processing unit, the output terminal of described secondary signal isolated location is connected with described USB-serial signal converting unit, and described secondary signal isolated location is used for the signal of electrical isolation from described RS-422 signal processing unit to described USB-serial signal converting unit direction transmission.
Preferably, in above-mentioned USB (universal serial bus)-balanced voltage digital interface converter, described first signal isolated location comprises: the first driver, the first photo-coupler, the first resistor, the second resistor, the 3rd resistor, the first electric capacity and the second electric capacity;
The input end of described the first driver is connected with described USB-serial signal converting unit, and the output terminal of described the first driver connects the negative electrode of the light emitting diode of described the first photo-coupler by described the first resistor;
The anode of the light emitting diode of described the first photo-coupler all is connected with power supply with the power pin of described the first driver;
The collector of the triode of described the first photo-coupler is connected with the first end of described the second resistor, the second end of described the second resistor as the output terminal of described first signal isolated location to described RS-422 signal processing unit output signal;
Described the 3rd resistor and described the first Capacitance parallel connection, one end of described the 3rd resistor is connected with the base stage of the triode of described the first photo-coupler, the other end is connected with the second end of described the second resistor, and the base stage of the triode of described the first photo-coupler is connected with power supply;
The emitter of described the first photo-coupler is connected with earth terminal;
One end of described the second electric capacity is connected with the second end of described the second resistor, and the other end is connected with earth terminal.
Preferably, in above-mentioned USB (universal serial bus)-balanced voltage digital interface converter, described secondary signal isolated location comprises:
The second photo-coupler, the 4th resistor, the 5th resistor, the 6th resistor, the 3rd electric capacity;
The negative electrode of the light emitting diode in described the second photo-coupler is connected with the first end of described the 4th resistor, and the second end of described the 4th resistor receives the signal from described RS-422 signal processing unit as the input end of described secondary signal isolated location;
The anode of the light emitting diode in described the second photo-coupler connects power supply;
The collector of the triode in described the second photo-coupler is connected with the first end of described the 5th resistor, the second end of described the 5th resistor as the output terminal of described secondary signal isolated location to described USB-serial signal converting unit output signal;
The collector of the triode in the first end of described the 6th resistor and described the second photo-coupler is connected the second termination power;
The base stage of the triode in described the second photo-coupler connects power supply;
The emitter of the triode in described the second photo-coupler connects earth terminal;
The first end of described the 3rd electric capacity is connected with the first end of described the 5th resistor, and the second end of described the 3rd electric capacity is connected with the second end of described the 6th resistor.
Via above-mentioned technical scheme as can be known, compared with prior art, the present invention adopts isolation scheme, under the prerequisite that guarantees proper communication function and signal transmission quality, cut off the electrical connection of signal transmission line computer and PLC, thereby stopped the fault that causes communication chip to burn because of electric leakage.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
The structured flowchart of the USB (universal serial bus) that Fig. 1 provides for the embodiment of the invention-balanced voltage digital interface converter;
Another structured flowchart of the USB (universal serial bus) that Fig. 2 provides for the embodiment of the invention-balanced voltage digital interface converter;
The structural representation of the signal isolated location that Fig. 3 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
With reference to figure 1, Fig. 1 shows a kind of structural representation of USB (universal serial bus)-balanced voltage digital interface converter.
USB (universal serial bus)-balanced voltage digital interface converter comprises: usb interface unit, USB-serial signal converting unit, RS-422 signal processing unit and RS-422 interface, above-mentioned converter also comprises the signal isolated location, the signal isolated location places between USB-serial signal converting unit and the RS-422 signal processing unit, is used for the signal between electrical isolation USB-serial signal converting unit and the RS-422 signal processing unit.
In the prior art, USB turns serial port chip and directly links to each other with the RS-422 transceiving chip, because USB turns serial port chip and directly links to each other with the RS-422 transceiving chip, having path on electric exists, and the present invention has used the signal isolated location in design, electrical isolation is carried out in the signal transmission of signal isolated location between the converter two ends, under the prerequisite that guarantees proper communication function and signal transmission quality, cut off the electrical connection of signal transmission line computer and PLC, thereby stopped the fault that causes communication chip to burn because of electric leakage.
With reference to figure 2, above-mentioned signal isolated location can comprise first signal isolated location U11 and secondary signal isolated location U12.
The input end of first signal isolated location U11 is connected with USB-serial signal converting unit, the output terminal of first signal isolated location U11 is connected with described RS-422 signal processing unit, and first signal isolated location U11 is used for the signal that electrical isolation is transmitted from USB-serial signal converting unit to RS-422 signal processing unit direction.
The input end of secondary signal isolated location U12 is connected with the RS-422 signal processing unit, the output terminal of secondary signal isolated location U12 is connected with USB-serial signal converting unit, and secondary signal isolated location U12 is used for the signal that electrical isolation is transmitted from the RS-422 signal processing unit to USB-serial signal converting unit direction.
With reference to figure 3, show a kind of structural representation of above-mentioned isolated location.
First signal isolated location U11 comprises the first driver 111, the first photo-coupler 112, the first resistor R1, the second resistor R2, the 3rd resistor R3, the first capacitor C 1 and the second capacitor C 2, wherein, the resistance of the first resistor R1 is that the resistance of 470 Ω, the second resistor R2 is that the resistance of 100 Ω, the 3rd resistor R3 is that the appearance value of 1000 Ω, the first capacitor C 1 is 0.1 microfarad, and the appearance value of the second capacitor C 2 is 3900 pico farads.
The effect of the first driver 111 is the serial output signals of amplifying from USB-serial signal converting unit, because photo-coupler 112 needs the drive current about 10mA, and the serial output signal strength of USB-serial signal converting unit output is not enough to directly drive photo-coupler, so need to increase driver 111 to drive the serial output signal by photo-coupler 112.
Pin in the first driver 111
Be the output control pin, pin A is input pin, and pin GND is grounding leg, and pin Y is output pin, and pin VCC is supply pin.
The model of the first driver 111 can be SN74AHCT1G125, with reference to shown in Figure 3,
Be output control pin, Low level effective.When
When connecing low level, 111 work of the first driver will from the signal of pin A input, be exported by pin Y; When
When connecing high level, the first driver 111 is not worked, and that is to say why the signal no matter pin A inputs is worth, and pin Y does not have output.In the design, owing to need the first driver 111 to work all the time, so pin A is connected with earth terminal.Pin GND is grounding leg, connects earth terminal; Pin VCC is connected to the positive 5V power supply VCC end of USB one side.
The input end A of the first driver 111 is connected with USB-serial signal converting unit as the input end 1 of first signal isolated location U11, and the output terminal Y of the first driver 111 connects the negative electrode of the light emitting diode of the first photo-coupler 112 by the first resistor R1.
The anode of the light emitting diode of the first photo-coupler 112 is connected with power supply VCC, and power supply is positive 5 volts of voltages of USB one side power supply;
The collector of the triode of the first photo-coupler 112 is connected with output terminal 2 by the second resistor R2, output terminal 2 as the output terminal of first signal isolated location U1 to described RS-422 signal processing unit output signal;
The 3rd resistor R3 is in parallel with the first capacitor C 1, the end of the 3rd resistor R3 is connected with the base stage of the triode of the first photo-coupler 112, the other end is connected with the output terminal 2 of first signal isolated location U1, the base stage of the triode of the first photo-coupler 112 is connected to power supply VCC1, power supply is positive 5 volts of end power supplys of RS-422 one side, and the acquiescence output level during with no-output is drawn high high level;
The emitter of the first photo-coupler 112 is connected with earth terminal, earth terminal be RS-422 one side power supply " " end;
One end of the second capacitor C 2 is connected with output terminal 2, and the other end is connected with earth terminal, earth terminal be RS-422 one side power supply " " end.
The first capacitor C 1 and the second capacitor C 2 these two electric capacity can play the effect of filtering high frequency noise.
Above-mentioned secondary signal isolated location U2 comprises the second photo-coupler 123, the 4th resistor R4, the 5th resistor R5, the 6th resistor R6 and the 3rd capacitor C 3, wherein, the resistance of the 4th resistor R4 is that the resistance of 100 Ω, the 5th resistor R5 is that the resistance of 100 Ω, the 6th resistor R6 is that the appearance value of 1000 Ω and the 3rd capacitor C 3 is 0.1 microfarad.
The negative electrode of the light emitting diode in the second photo-coupler 123 is connected with input end 3 by the 4th resistor R4, and input end 3 is the input end of secondary signal isolated location U2, and it receives the signal from the RS-422 signal processing unit;
The anode of the light emitting diode in the second photo-coupler 123 meets power supply VCC1, and power supply is positive 5 volts of power supplys of RS-422 one side;
The collector of the triode in the second photo-coupler 123 is connected with output terminal 4 by the 5th resistor R5, output terminal 4 is the output terminal of secondary signal isolated location U2, its as the output terminal of secondary signal isolated location to USB-serial signal converting unit output signal;
The collector of the triode in the first end of the 6th resistor R6 and the second photo-coupler 123 is connected, and the second termination power, power supply are positive 5 volts of power supplys of USB one side, and the acquiescence output level during with no-output is drawn high high level;
The base stage of the triode in the second photo-coupler 123 connects power supply, and power supply is positive 5 volts of power supplys of USB one side;
The emitter of the triode in the second photo-coupler 123 connects earth terminal, and earth terminal is the earth terminal of USB one side;
The first end of the 3rd capacitor C 3 is connected with output terminal 4, and the second end of the 3rd capacitor C 3 is connected with the second end of the 6th resistor.
Preferably, the model of above-mentioned the first photo-coupler and the second coupling mechanism can be PS9114.
The following describes the course of work of first signal isolated location and secondary signal isolated location, take the course of work of first signal isolated location as example, the first signal isolated location is realized the electrical isolation of signal from USB to the RS-422 direction; And the first signal isolated location is realized the electrical isolation of signal from RS-422 to the USB direction, and its principle of work is identical, and just signal flows to the direction difference, so no longer repeat.
From the input end A input from the first driver 111 of the signal (hereinafter referred to as " input signal ") of USB one side, after amplifying signal, the first driver 111 from pin Y output, is connected to the negative electrode of diode in the first photo-coupler 112 by the first resistor R1.
When input signal is high level, the negative electrode of light emitting diode is high level in the first photo-coupler 112, anode also is high level, therefore light emitting diode is not luminous, and in the first photo-coupler 112 triode because do not receive light signal and not conducting, so output terminal 2 is drawn high high level by the 3rd resistor R3.
When input signal is low level, the negative electrode of light emitting diode is low level in the first photo-coupler 112, anode is high level, lumination of light emitting diode, triode conducting because receiving light signal in the first photo-coupler 112 is so output terminal 2 is pulled down to low level by the second resistor R2.
The conversion of the electric signal-light signal by the first photo-coupler 112-electric signal has realized the high and low level signal of transmission, and the direct function of electrical connection of isolation.
Photo-coupler inside in the embodiment of the invention is comprised of optical transmitting set (light emitting diode) and optical receiver (triode), and the electric signal of input photo-coupler inside is converted to light signal through optical transmitting set, is converted to electric signal output by optical receiver again.Realize the electrical isolation of input end and output terminal by the transfer process of this " electrical-optical-electricity ".And signal can only be from input end to the output terminal one-way transmission, and the signal level maximum magnitude of output terminal output is determined by circuit of output terminal.During owing to the somewhere generation electric voltage exception of the reasons such as static discharge, short circuit, electric leakage in whole system, photo-coupler can prevent that this abnormal voltage from arriving the other end by photo-coupler and forming path, under the prerequisite that guarantees proper communication function and signal transmission quality, cut off the electrical connection of signal transmission line computer and PLC, thereby stopped the fault that causes communication chip to burn because of electric leakage.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. USB (universal serial bus)-balanced voltage digital interface converter, comprise usb interface unit, USB-serial signal converting unit, RS-422 signal processing unit and RS-422 interface, it is characterized in that, also comprise the signal isolated location, described signal isolated location places between described USB-serial signal converting unit and the described RS-422 signal processing unit, is used for the signal between electrical isolation described USB-serial signal converting unit and the described RS-422 signal processing unit.
2. USB (universal serial bus) according to claim 1-balanced voltage digital interface converter is characterized in that,
Described signal isolated location comprises first signal isolated location and secondary signal isolated location;
The input end of described first signal isolated location is connected with described USB-serial signal converting unit, the output terminal of described first signal isolated location is connected with described RS-422 signal processing unit, and described first signal isolated location is used for the signal of electrical isolation from described USB-serial signal converting unit to described RS-422 signal processing unit direction transmission;
The input end of described secondary signal isolated location is connected with described RS-422 signal processing unit, the output terminal of described secondary signal isolated location is connected with described USB-serial signal converting unit, and described secondary signal isolated location is used for the signal of electrical isolation from described RS-422 signal processing unit to described USB-serial signal converting unit direction transmission.
3. USB (universal serial bus) according to claim 2-balanced voltage digital interface converter, it is characterized in that described first signal isolated location comprises: the first driver, the first photo-coupler, the first resistor, the second resistor, the 3rd resistor, the first electric capacity and the second electric capacity;
The input end of described the first driver is connected with described USB-serial signal converting unit, and the output terminal of described the first driver connects the negative electrode of the light emitting diode of described the first photo-coupler by described the first resistor;
The anode of the light emitting diode of described the first photo-coupler all is connected with power supply with the power pin of described the first driver;
The collector of the triode of described the first photo-coupler is connected with the first end of described the second resistor, the second end of described the second resistor as the output terminal of described first signal isolated location to described RS-422 signal processing unit output signal;
Described the 3rd resistor and described the first Capacitance parallel connection, one end of described the 3rd resistor is connected with the base stage of the triode of described the first photo-coupler, the other end is connected with the second end of described the second resistor, and the base stage of the triode of described the first photo-coupler is connected with power supply;
The emitter of described the first photo-coupler is connected with earth terminal;
One end of described the second electric capacity is connected with the second end of described the second resistor, and the other end is connected with earth terminal.
4. USB (universal serial bus) according to claim 2-balanced voltage digital interface converter is characterized in that, described secondary signal isolated location comprises:
The second photo-coupler, the 4th resistor, the 5th resistor, the 6th resistor, the 3rd electric capacity;
The negative electrode of the light emitting diode in described the second photo-coupler is connected with the first end of described the 4th resistor, and the second end of described the 4th resistor receives the signal from described RS-422 signal processing unit as the input end of described secondary signal isolated location;
The anode of the light emitting diode in described the second photo-coupler connects power supply;
The collector of the triode in described the second photo-coupler is connected with the first end of described the 5th resistor, the second end of described the 5th resistor as the output terminal of described secondary signal isolated location to described USB-serial signal converting unit output signal;
The collector of the triode in the first end of described the 6th resistor and described the second photo-coupler is connected the second termination power;
The base stage of the triode in described the second photo-coupler connects power supply;
The emitter of the triode in described the second photo-coupler connects earth terminal;
The first end of described the 3rd electric capacity is connected with the first end of described the 5th resistor, and the second end of described the 3rd electric capacity is connected with the second end of described the 6th resistor.
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| CN115277371A (en) * | 2022-07-15 | 2022-11-01 | 南京熊猫电子制造有限公司 | Modular CAN communication isolation circuit system |
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