CN101211222A - Frequency converter intrinsic safety keyboard signal transmitting and receiving circuit - Google Patents
Frequency converter intrinsic safety keyboard signal transmitting and receiving circuit Download PDFInfo
- Publication number
- CN101211222A CN101211222A CNA2006101487602A CN200610148760A CN101211222A CN 101211222 A CN101211222 A CN 101211222A CN A2006101487602 A CNA2006101487602 A CN A2006101487602A CN 200610148760 A CN200610148760 A CN 200610148760A CN 101211222 A CN101211222 A CN 101211222A
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- keyboard
- cpu
- intrinsic safety
- circuit
- coupler
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- Input From Keyboards Or The Like (AREA)
Abstract
The invention provides an intrinsic safe keyboard transceiver circuit for an explosion-proof converter, which comprises a CPU interface connected with the CPU board, a keyboard interface connected with an intrinsic safe keyboard and a serial communication signal separable transform circuit connected between the CPU interface and the keyboard interface. The serial communication signal separable transform circuit includes an optical coupler, the light transmission tub of the optical coupler is connected with the CPU interface, and the light receiving tube of which is connected with the keyboard interface. The keyboard transceiver circuit of the invention uses an optical coupling device, which largely simplifies the structure, reduces the circuit complexity, and meanwhile maintains reliable performance.
Description
Technical field
The present invention relates to explosion-proof frequency converter, specifically, relate to a kind of explosion-proof frequency converter intrinsic safety keyboard signal transmitting and receiving circuit.
Background technology
Frequency converter all has application in a lot of occasions.In some hazardous areas such as inflammable, explosive, need employed frequency converter have explosion-proof performance, therefore, explosion-proof frequency converter arises at the historic moment.In order to realize explosion-proof performance, the operation keyboard that uses in the explosion-proof frequency converter also must meet explosion-proof this case requirement, but in the present product, the intrinsic safety keyboard has adopted comparatively complicated circuit structure, causes cost of products higher, complex manufacturing.
Summary of the invention
Therefore, of the present inventionly be to provide a kind of frequency converter intrinsic safety keyboard signal transmitting and receiving circuit, it has advantage simple in structure, dependable performance.
According to above-mentioned purpose, explosion-proof frequency converter intrinsic safety keyboard signal transmitting and receiving circuit of the present invention comprises:
Cpu i/f is used for being connected with CPU board;
Keyboard interface is used for being connected with the intrinsic safety keyboard;
Serial communication signals is isolated change-over circuit, is connected between described cpu i/f and the described keyboard interface.
In above-mentioned explosion-proof frequency converter intrinsic safety keyboard signal transmitting and receiving circuit, described serial communication signals is isolated change-over circuit and is comprised:
Received signal is isolated change-over circuit, is connected between described cpu i/f and the described keyboard interface;
Send the Signal Spacing change-over circuit, be connected between described cpu i/f and the described keyboard interface.
In above-mentioned flame-proof converter intrinsic safety keyboard signal transmitting and receiving circuit, described received signal is isolated change-over circuit and is comprised a photo-coupler, light-emitting tube in this photo-coupler is connected on the described cpu i/f, and the light receiving tube in this photo-coupler is connected on the described keyboard interface.
In above-mentioned flame-proof converter intrinsic safety keyboard signal transmitting and receiving circuit, described received signal is isolated change-over circuit and is comprised another photo-coupler, light-emitting tube in this another photo-coupler is connected on the described keyboard interface, and the light receiving tube in this photo-coupler is connected on the described cpu i/f.
As mentioned above, keyboard signal transmission circuit of the present invention has adopted Light Coupled Device, and bigger simplification has structurally been arranged, and the complexity of circuit is reduced, and has kept reliable performance simultaneously.
Description of drawings
Fig. 1 shows frequency converter intrinsic safety keyboard signal transmitting and receiving circuit of the present invention.
Embodiment
See also Fig. 1, Fig. 1 is explosion-proof frequency converter this case keyboard signal transmission circuit figure of the present invention.This transmission circuit comprises cpu i/f 10 and keyboard interface 20.Cpu i/f is used for being connected with CPU board, and keyboard interface 20 is used for being connected with the intrinsic safety keyboard.
Between cpu i/f 10 and keyboard interface 20, be connected with serial communication signals and isolate change-over circuit, so that between CPU and intrinsic safety keyboard, carry out the transmission of signal.As shown in Figure 1, serial communication signals is isolated change-over circuit and can be made of two parts, and promptly received signal is isolated change-over circuit 31 and sent Signal Spacing change-over circuit 32.
Received signal is isolated change-over circuit 31 and is connected between cpu i/f 10 and the keyboard interface 20, and keyboard can utilize this received signal to isolate change-over circuit 31 and receive the signal that sends from CPU.Received signal is isolated change-over circuit 31 and is included a photo-coupler 31A, and the light-emitting tube among the photo-coupler 31A is connected on the cpu i/f 10, and the light receiving tube among the photo-coupler 31A is connected on the keyboard interface 20.
Send Signal Spacing change-over circuit 32 and be connected between cpu i/f 10 and the keyboard interface 20, keyboard can utilize this transmission Signal Spacing change-over circuit 32 to send signal to CPU.Send Signal Spacing change-over circuit 32 and include a photo-coupler 32A, the light-emitting tube among the photo-coupler 32A is connected on the keyboard interface 20, and the light receiving tube among the photo-coupler 32A is connected on the cpu i/f 10.
In circuit of the present invention, can also include an intrinsic safety electric source 40, be used for providing power supply to each parts of circuit.
Claims (5)
1. an explosion-proof frequency converter intrinsic safety keyboard signal transmitting and receiving circuit is characterized in that, comprising:
Cpu i/f is used for being connected with CPU board;
Keyboard interface is used for being connected with the intrinsic safety keyboard; With
Serial communication signals is isolated change-over circuit, is connected between described cpu i/f and the described keyboard interface.
2. explosion-proof frequency converter intrinsic safety keyboard signal transmitting and receiving circuit as claimed in claim 1 is characterized in that, described serial communication signals is isolated change-over circuit and comprised:
Received signal is isolated change-over circuit, is connected between described cpu i/f and the described keyboard interface; With
Send the Signal Spacing change-over circuit, be connected between described cpu i/f and the described keyboard interface.
3. flame-proof converter intrinsic safety keyboard signal transmitting and receiving circuit as claimed in claim 2, it is characterized in that, described received signal is isolated change-over circuit and is comprised a photo-coupler, light-emitting tube in this photo-coupler is connected on the described cpu i/f, and the light receiving tube in this photo-coupler is connected on the described keyboard interface.
4. flame-proof converter intrinsic safety keyboard signal transmitting and receiving circuit as claimed in claim 2, it is characterized in that, described received signal is isolated change-over circuit and is comprised another photo-coupler, light-emitting tube in this another photo-coupler is connected on the described keyboard interface, and the light receiving tube in this photo-coupler is connected on the described cpu i/f.
5. as the described flame-proof converter this case of one of claim 1 to 4 keyboard signal transmission circuit, it is characterized in that, also comprise an intrinsic safety electric source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101487602A CN101211222A (en) | 2006-12-30 | 2006-12-30 | Frequency converter intrinsic safety keyboard signal transmitting and receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101487602A CN101211222A (en) | 2006-12-30 | 2006-12-30 | Frequency converter intrinsic safety keyboard signal transmitting and receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101211222A true CN101211222A (en) | 2008-07-02 |
Family
ID=39611291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101487602A Pending CN101211222A (en) | 2006-12-30 | 2006-12-30 | Frequency converter intrinsic safety keyboard signal transmitting and receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101211222A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281542A (en) * | 2015-04-20 | 2016-01-27 | 重庆有法数控设备有限责任公司 | Explosion protection frequency converter |
| US10180133B2 (en) | 2013-11-22 | 2019-01-15 | Rheonix, Inc. | Channel-less pump, methods, and applications thereof |
| CN110324035A (en) * | 2019-06-28 | 2019-10-11 | 长安大学 | A kind of isolated serial communication interface circuit |
-
2006
- 2006-12-30 CN CNA2006101487602A patent/CN101211222A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10180133B2 (en) | 2013-11-22 | 2019-01-15 | Rheonix, Inc. | Channel-less pump, methods, and applications thereof |
| CN105281542A (en) * | 2015-04-20 | 2016-01-27 | 重庆有法数控设备有限责任公司 | Explosion protection frequency converter |
| CN110324035A (en) * | 2019-06-28 | 2019-10-11 | 长安大学 | A kind of isolated serial communication interface circuit |
| CN110324035B (en) * | 2019-06-28 | 2023-02-28 | 长安大学 | Isolated serial communication interface circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080702 |