CN205540382U - Prevent short -circuit protection's bus buffer circuit - Google Patents
Prevent short -circuit protection's bus buffer circuit Download PDFInfo
- Publication number
- CN205540382U CN205540382U CN201620199586.3U CN201620199586U CN205540382U CN 205540382 U CN205540382 U CN 205540382U CN 201620199586 U CN201620199586 U CN 201620199586U CN 205540382 U CN205540382 U CN 205540382U
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- China
- Prior art keywords
- circuit
- relay
- isolation
- bus
- short
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Abstract
The utility model relates to a circuit protection technical field, concretely relates to prevent short -circuit protection's bus buffer circuit, the purpose is solved under a humidity or the environment that soaks, problem that the output port of instrument probably the short circuit appears and destroys inside accurate circuit. Its characterized in that, it includes relay K1, pressure displacement switch S1, keeps apart the bus in terminal, keeps apart bus output terminal and power supply terminal, the one end of pressure displacement switch is connected with the power port, and the other end is connected with the one end of relay, the other end of relay is established ties respectively between inside power cord, signal line and outside connector contact through a plurality of relay contact points switches, connects into open state. The utility model discloses simple structure, ingenious, this bus buffer circuit only use electromagnetic relay and control switch just to realize inside with the outside isolation of instrument. This buffer circuit uses the mechanical type switch to realize complete physics to keep apart, and the sneak path stopping probably to appear among the electronic circuit is to the damage of instrument internal circuit.
Description
Technical field
The present invention relates to circuit protection technical field, be specifically related to the bus isolation circuit of a kind of anti-short-circuit protection.
Background technology
Electrical equipment and the external interface of instrument, including power supply interface and various data bus interface by connecing
The media such as plug-in unit need when externally connecting to consider interface circuit short circuit, open circuit, cross when stream, overvoltage
Protective measure.If internal electric source output short-circuit, excessive electric current causes temperature drastically to raise and damage power supply
Module, in some instances it may even be possible to the precision circuit in user's instrument can be damaged.If various data/address bus are short at outfan
Road will also result in output overcurrent protection and data-transformation facility lost efficacy.The short circuit guarantor of conventional power output end
The measure of protecting has employing output overcurrent observation circuit or protective resistance of connecting on power supply output line, overcurrent monitoring electricity
Road it is generally required to the complicated circuit of design or use privacy protection device, this to the most existing electrical equipment and
Instrument is unpractical.The output short circuit protection of some data/address bus is also required to special protection chip, some
Simple protective measure is protective resistance of connecting on the output line, but for a lot of HW High Ways,
The protective resistance of series connection can change the impedance operator of signal output, affects the integrity of signal.
Particularly at some, waterproof sealing is required higher, need again to carry out external wired power supply and communication link
The use occasion connect, if outside connector dabbles or immersion can cause external interface short circuit, it is possible to damage
Internal precision circuit
Summary of the invention
Present invention aim to address that, in the environment of a moist or water-immerged, the output port of instrument may go out
The problem showing short circuit and damage internal precision circuit, it is provided that the bus of a kind of reliable and stable anti-short-circuit protection
Isolation circuit.
The present invention is achieved in that
The bus isolation circuit of a kind of anti-short-circuit protection, including relay K 1, line pressure shift switch S1, isolation
Bus input end, isolation output end of main and power supply terminal；One end of line pressure shift switch and power end
Mouth connects, and the other end is connected with one end of relay；The other end of relay is opened by multiple relay contacts
Close and be connected on respectively between internal power cord, holding wire and outside connector contact, connect into normally open.
The relay contact switch of relay K 1 as above is the most N number of.
The relay contact switch of relay K 1 as above has eight.
One end of relay contact switch as above by isolation bus input end respectively with power supply contact
Connecting with signalling contact, the other end is connected with power port and COM1 respectively by isolation output end of main
Connect；One end of line pressure shift switch S1 is connected with power port by power supply terminal.
Relay K 1 as above and line pressure shift switch S1 are arranged on isolation circuit board, relay K 1
It is connected with isolation output end of main and isolation bus input end by the form of fly line respectively.
Isolation circuit board as above uses PCB material to make, or uses the attached one layer of phenolic resin of aluminium sheet exhausted
Edge bakelite plate does isolates.
The invention has the beneficial effects as follows:
The present invention includes relay and line pressure shift switch.Present configuration is simple, ingenious, this Bus isolation
Circuit only uses electromagnetic relay and controls to switch the buffer action being achieved that instrument internal with outside.Realize
Physical isolation, compared with the electrical isolation circuit using transistor or metal-oxide-semiconductor, this isolation circuit uses machinery
Formula switch achieves physical isolation completely, and the sneak path having stopped to be likely to occur in electronic circuit is in instrument
The damage of portion's circuit.Extensibility is strong, and this isolation circuit can pass through according to the number of buses that instrument internal needs
The number of contacts increasing relay is extended, without causing the complication of circuit itself.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the bus isolation circuit of a kind of anti-short-circuit protection of the present invention；
Fig. 2 is eight channel bus isolation circuit cloth of the bus isolation circuit of a kind of anti-short-circuit protection of the present invention
Office's figure.
Detailed description of the invention
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, the bus isolation circuit of a kind of anti-short-circuit protection, including relay K 1, pressure
Power displacement switch S1, isolation bus input end, isolation output end of main and power supply terminal.Line pressure shift
One end of switch is connected with power port, and the other end is connected with one end of relay.The other end of relay leads to
Cross multiple relay contact switch to be connected on respectively between internal power cord, holding wire and outside connector contact,
Connect into normally open.
As depicted in figs. 1 and 2, the relay coil of relay K 1 has three, and relay contact switch is common
There is N each, N=8 in the present embodiment, it is adaptable to eight channel bus.One end of relay contact switch is passed through
Isolation bus input end is connected with power supply contact and signalling contact respectively, and the other end is exported by isolation bus
Terminal is connected with COM1 and power port respectively.Line pressure shift switch S1 one end by power supply terminal with
Power port connects.
Relay K 1 and line pressure shift switch S1 are arranged on isolation circuit board, and isolation circuit board uses PCB
Material is made, it is possible to use aluminium sheet, and attached one layer of phenolic resin insulating cement plank does and isolate.Relay K 1
It is connected with isolation output end of main and isolation bus input end by the form of fly line respectively.
Present configuration is simple, and it is convenient to implement, and isolation effect is notable, can carry for the sophisticated electronics of user
For the safety isolation protective under moist or water-immerged environment, have broad application prospects and good economic benefit.
Claims (6)
1. the bus isolation circuit of an anti-short-circuit protection, it is characterised in that: it includes relay K 1, pressure
Displacement switch S1, isolation bus input end, isolation output end of main and power supply terminal；Line pressure shift is opened
The one end closed is connected with power port, and the other end is connected with one end of relay；The other end of relay passes through
Multiple relay contact switch are connected between internal power cord, holding wire and outside connector contact respectively,
Connect into normally open.
The bus isolation circuit of anti-short-circuit protection the most according to claim 1, it is characterised in that: described
The relay contact switch of relay K 1 altogether the most N number of.
The bus isolation circuit of anti-short-circuit protection the most according to claim 2, it is characterised in that: described
Relay contact switch have eight.
The bus isolation circuit of anti-short-circuit protection the most according to claim 1, it is characterised in that: described
Relay contact switch one end by isolation bus input end respectively with power supply contact and signalling contact even
Connecing, the other end is connected with power port and COM1 respectively by isolation output end of main；Line pressure shift
One end of switch S1 is connected with power port by power supply terminal.
The bus isolation circuit of anti-short-circuit protection the most according to claim 1, it is characterised in that: described
Relay K 1 and line pressure shift switch S1 be arranged on isolation circuit board, relay K 1 is respectively by flying
The form of line is connected with isolation output end of main and isolation bus input end.
The bus isolation circuit of anti-short-circuit protection the most according to claim 5, it is characterised in that: described
Isolation circuit board use PCB material make, or use the attached one layer of phenolic resin insulating cement plank of aluminium sheet do every
From.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620199586.3U CN205540382U (en) | 2016-03-15 | 2016-03-15 | Prevent short -circuit protection's bus buffer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620199586.3U CN205540382U (en) | 2016-03-15 | 2016-03-15 | Prevent short -circuit protection's bus buffer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205540382U true CN205540382U (en) | 2016-08-31 |
Family
ID=56782650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620199586.3U Expired - Fee Related CN205540382U (en) | 2016-03-15 | 2016-03-15 | Prevent short -circuit protection's bus buffer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205540382U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193316A (en) * | 2016-03-15 | 2017-09-22 | 北京航天斯达科技有限公司 | A kind of bus isolation circuit of anti-short-circuit protection |
-
2016
- 2016-03-15 CN CN201620199586.3U patent/CN205540382U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193316A (en) * | 2016-03-15 | 2017-09-22 | 北京航天斯达科技有限公司 | A kind of bus isolation circuit of anti-short-circuit protection |
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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: 20160831 |