CN203164421U - Isolating circuit and navigation terminal with the same - Google Patents
Isolating circuit and navigation terminal with the same Download PDFInfo
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- CN203164421U CN203164421U CN 201320089831 CN201320089831U CN203164421U CN 203164421 U CN203164421 U CN 203164421U CN 201320089831 CN201320089831 CN 201320089831 CN 201320089831 U CN201320089831 U CN 201320089831U CN 203164421 U CN203164421 U CN 203164421U
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- power supply
- circuit
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- navigation terminal
- coupler
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Abstract
The utility model relates to an isolating circuit and a navigation terminal with the same. The isolating circuit comprises a power supply circuit, a terminal internal circuit, a driving chip, an isolating power supply and an optical coupler, wherein the output end of the power supply circuit is respectively connected with the input end of the terminal internal circuit and the primary electrode of the isolating power supply, the power supply circuit is used for providing a working voltage to the terminal internal circuit and the isolating power supply, the output end of the isolating power supply is connected with the driving chip; the input end of the optical coupler is connected with the terminal internal circuit, and the output end of the isolating power supply is connected with the driving chip; the coil coupling function of the isolating power supply and the optical coupling function of the optical coupler are used for realizing the electrical isolation between the terminal internal circuit and an outer communication interface. The isolating power supply and the optical coupler are added, thus the outer communication interface is electrically isolated from the terminal internal circuit, the transmission path externally electromagnetically interfered is cut off, the external electromagnetic interference is avoided, the cost is low, the isolation effect is good, and the anti-interference ability is good.
Description
Technical field
The utility model relates to a kind of navigation terminal technical field, relates in particular to a kind of buffer circuit and has the navigation terminal of this buffer circuit.
Background technology
In recent years based on mobile communication, satellite positioning tech, Geographic Information System (Geographic Information System, GIS) vehicle mounted guidance terminal application technology constantly develops at home, maturation, and increasing vehicle manufacturing enterprise has produced keen interest to the navigation terminal product.By setting up monitoring network platform, vehicle installs navigation terminal additional, has promoted control and the safety of person vehicle of management of vehicles, operation cost, has improved the use value of vehicle all sidedly, has created more enterprise profit, has strengthened the synthesized competitiveness of enterprise.
Along with progressively deeply advancing that airmanship is used, contacting of vehicle mounted guidance terminal and vehicle control device is more and more tightr, navigation terminal need pass through RS232 interface, RS485 interface and CAN(Controller Area Network, and CAN) bus interface etc. links to each other with vehicle control device.If the vehicle operation environment has serious electromagnetic interference (EMI), then these electromagnetism are easy to disturb by communication interface rat tail and the various communication interface terminal inner circuit to vehicle mounted guidance terminal, easily cause the navigation terminal operation irregularity, even may cause the permanent inefficacy of inner function module of navigation terminal.
As shown in Figure 1, the connecting circuit of present navigation terminal and external communication interface and power supply, comprise the power circuit 1 that is connected with the input end of external power source, the terminal inner circuit 3 that is connected with the output terminal of power circuit, the driving chip 5 that is connected with the output terminal of terminal inner circuit 3, the output terminal that wherein drives chip 5 directly is connected with communication interface, has formed a path that electrical part connects.When there is electromagnetic interference (EMI) in the working environment of navigation terminal, these electromagnetism will also can transfer to terminal inner circuit 3 by the power circuit 1 that is connected with external power source by be connected to such an extent that driving chip 5 transfers in the terminal inner circuit 3 of navigation terminal with communication interface.This power circuit 1, terminal inner circuit 3, driving chip 5 provide a transmission paths for disturbing electromagnetism, cause electromagnetism that the terminal inner circuit of navigation terminal is produced interference, and then have influenced the operate as normal of this navigation terminal.
In order to solve the problem of electromagnetic interference (EMI), be necessary to design a kind of buffer circuit that can anti-electromagnetic interference (EMI).
Summary of the invention
Fundamental purpose of the present utility model is, can't overcome the defective of the electromagnetic interference (EMI) etc. of external communication interface at the terminal inner circuit of navigation terminal in the prior art, propose a kind of energy isolating exterior communication interface and terminal inner circuit, cut off the buffer circuit of electromagnetic interference (EMI) transmission path.
A kind of buffer circuit that the utility model provides and the navigation terminal with this buffer circuit, this buffer circuit comprises: the power circuit that is connected with external power source, terminal inner circuit and the driving chip, insulating power supply and the photo-coupler that are connected with external communication interface, the output terminal of described power circuit is connected with the input end of described terminal inner circuit, described insulating power supply respectively, described power circuit is used for providing operating voltage to described terminal inner circuit and described insulating power supply, and the output terminal of described insulating power supply is connected with described driving chip; The input end of described photo-coupler is connected with described terminal inner circuit, output terminal is connected with described driving chip; Magnetic coupling interaction by described insulating power supply and the optically-coupled effect of described photo-coupler realize the electrical isolation between described terminal inner circuit and the external communication interface.
Preferably, described external communication interface is at least a RS232 interface, RS485 interface or CAN bus interface.
Preferably, described insulating power supply is that auto-excitation type is recommended inverter.
Preferably, described photo-coupler is linear optocoupler.
A kind of navigation terminal comprises above-mentioned buffer circuit.
Preferably, described navigation terminal is GPS navigation terminal, Big Dipper navigation terminal, Galileo navigation terminal or Ge Luonasi navigation terminal.
The beneficial effect of implementing a kind of buffer circuit of the utility model and having a navigation terminal of this buffer circuit is: the utility model is by at the terminal inner circuit with drive and increase insulating power supply and photo-coupler between the chip, make between external communication interface and the terminal inner circuit from electric isolation, cut off the transmission path of external electromagnetic interference, thereby avoided the electromagnetic interference (EMI) of external communication interface transmission.Simultaneously, only needing increases common insulating power supply and photo-coupler, and with low cost, isolation effect is good, and antijamming capability is strong.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done simple the introduction in will describing embodiment below, obviously, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings, in the accompanying drawing:
Fig. 1 is the circuit diagram of navigation terminal in the prior art;
A kind of buffer circuit synoptic diagram that Fig. 2 provides for the utility model.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, the various embodiment that hereinafter will describe will be with reference to corresponding accompanying drawing, these accompanying drawings have constituted the part of embodiment, have wherein described and have realized the various embodiment that the present invention may adopt.Should understand, also can use other embodiment, perhaps this paper listed examples be carried out modification on the 26S Proteasome Structure and Function, and can not depart from the scope and spirit of the present invention.
The utility model provides a kind of can isolate by external communication interface producing the buffer circuit of electromagnetic interference (EMI) between the terminal inner circuit of this navigation terminal.By increasing insulating power supply and photo-coupler, make between external communication interface and the terminal inner circuit and isolate from electric, cut off the transmission path of external electromagnetic interference.This external communication interface can be one or more in the interfaces such as RS232 interface, RS485 interface, CAN bus interface, USB interface, pci interface, IEEE1394 interface, SATA interface.
With reference to figure 2, a kind of buffer circuit that can anti-electromagnetic interference (EMI) that provides for the utility model.This circuit comprises: power circuit 1, insulating power supply 2, terminal inner circuit 3, photo-coupler 4, driving chip 5.Power circuit 1 links to each other with the power input of outside, for terminal inner circuit 3 and insulating power supply 2 provide operating voltage.Insulating power supply 2 provides operating voltage for driving chip 5, makes this driving chip 5 work.Insulating power supply 2 is generally auto-excitation type and recommends inverter, recommends inverter as B0505 type auto-excitation type, also can be the inverse-excitation type inverter certainly.Terminal inner circuit 3 is the general name (terminal inner circuit 3 is prior aries, so disclose detail) that makes all circuit of navigation terminal operate as normal, and it comprises signal processing circuit, control circuit, amplifying circuit, change-over circuit etc.Photo-coupler 4 is preferably linear optocoupler, as 6N137 type photo-coupler, TLP181 type photo-coupler etc. (because this photo-coupler 4 is well known technology, not being described in detail) herein.Light emitting diode in the terminal inner circuit 3 input electrical signals driving photo-coupler 4 sends the light of certain wavelength, received and the generation photocurrent by the photo-detector in the photo-coupler 4, again through further amplifying back output, to driving chip 5, make terminal inner circuit 3 and driving chip 5 realize electrical isolation fully at output terminal output electric signal.Drive chip 5 and carry out data transmission for linking to each other with outside vehicle mounted communication interface.By increasing insulating power supply 2 and photo-coupler 4, make between external communication interface and the terminal inner circuit 3 and isolate from electric, cut off the transmission path of external electromagnetic interference.
As shown in Figure 2, the input end of power circuit 1 is connected with the output terminal of external power source, and output terminal is connected with terminal inner circuit 3, insulating power supply 2.The input end of insulating power supply 2 is connected with power circuit 1, and output terminal is connected with driving chip 5.The outside vehicle power supply is to power circuit 1 input voltage, and this power circuit 1 is converted into the operating voltage of terminal inner circuit 3 with this input voltage, simultaneously this operating voltage is inputed to insulating power supply 2.Insulating power supply 2 provides operating voltage to driving chip 5 separately.The input end of insulating power supply 2 is connected with power circuit 1, output terminal is connected with driving chip 5, adopt the coil coupling between input end and the output terminal, thereby power circuit 1 and the external communication interface that is connected on the driving chip 5 are kept apart, cut off the transmission path of electromagnetism.The external communication interface of navigation terminal includes but not limited to RS232 interface, RS485 interface, CAN bus interface etc.This external communication interface with drive chip 5 and be connected, be connected a photo-coupler 4 between this driving chip 5 and the terminal inner circuit 3; The input end of photo-coupler 4 is connected with terminal inner circuit 3, output terminal is connected with driving chip 5, the electric signal that terminal inner circuit 3 provides transfers to photo-coupler 4, photo-coupler 4 converts thereof into light signal, converting electric signal again at its output terminal provides to driving chip 5, therefore photo-coupler 4 has cut off the transmission path of electromagnetism from signal wire, thereby has realized the isolation between external communication interface and the terminal inner circuit 3.
The buffer circuit that adopts the utility model to provide, with low cost, only needing to increase common insulating power supply and photo-coupler can realize from the electromagnetic interference (EMI) of power supply and signal wire two aspect isolating exterior communication interface conduction, cut off its travel path, the good isolation effect is provided, has strengthened the antijamming capability of this navigation terminal.
The utility model also provides a kind of navigation terminal, and this navigation terminal has above-mentioned buffer circuit.This navigation terminal can be GPS navigation terminal, Big Dipper navigation terminal, Galileo navigation terminal or Ge Luonasi navigation terminal.
The above only is preferred embodiment of the present invention, and those skilled in the art know, under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes or be equal to replacement these features and embodiment.In addition, under instruction of the present invention, can make amendment to adapt to concrete situation and material to these features and embodiment and can not break away from the spirit and scope of the present invention.Therefore, the present invention is not subjected to the restriction of specific embodiment disclosed herein, and all interior embodiment of claim scope that fall into the application belong to protection scope of the present invention.
Claims (6)
1. a buffer circuit comprises power circuit (1), the terminal inner circuit (3) that is connected with external power source and the driving chip (5) that is connected with external communication interface; It is characterized in that described buffer circuit also comprises insulating power supply (2) and photo-coupler (4); The output terminal of described power circuit (1) is connected with the input end of described terminal inner circuit (3) and the input end of described insulating power supply (2) respectively, described power circuit (1) is used for providing operating voltage to described terminal inner circuit (3) and described insulating power supply (2), and the output terminal of described insulating power supply (2) is connected with described driving chip (5); The input end of described photo-coupler (4) is connected with the output terminal of described terminal inner circuit (3), the output terminal of described photo-coupler (4) is connected with described driving chip (5); Coil coupling by described insulating power supply (1) and the optically-coupled effect of described photo-coupler (4) realize the electrical isolation between described terminal inner circuit (3) and the external communication interface.
2. buffer circuit according to claim 1 is characterized in that, described external communication interface is at least a RS232 interface, RS485 interface or CAN bus interface.
3. buffer circuit according to claim 1 is characterized in that, described insulating power supply (2) is recommended inverter for auto-excitation type.
4. buffer circuit according to claim 1 is characterized in that, described photo-coupler (4) is linear optocoupler.
5. a navigation terminal is characterized in that, comprises each described buffer circuit among the claim 1-4.
6. navigation terminal according to claim 5 is characterized in that, described navigation terminal is GPS navigation terminal, Big Dipper navigation terminal, Galileo navigation terminal or Ge Luonasi navigation terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320089831 CN203164421U (en) | 2013-02-27 | 2013-02-27 | Isolating circuit and navigation terminal with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320089831 CN203164421U (en) | 2013-02-27 | 2013-02-27 | Isolating circuit and navigation terminal with the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164421U true CN203164421U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320089831 Expired - Fee Related CN203164421U (en) | 2013-02-27 | 2013-02-27 | Isolating circuit and navigation terminal with the same |
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| Country | Link |
|---|---|
| CN (1) | CN203164421U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456762A (en) * | 2019-07-25 | 2019-11-15 | 合肥同智机电控制技术有限公司 | A kind of vehicle integrated control system |
-
2013
- 2013-02-27 CN CN 201320089831 patent/CN203164421U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456762A (en) * | 2019-07-25 | 2019-11-15 | 合肥同智机电控制技术有限公司 | A kind of vehicle integrated control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20170227 |