CN107193316A - A kind of bus isolation circuit of anti-short-circuit protection - Google Patents
A kind of bus isolation circuit of anti-short-circuit protection Download PDFInfo
- Publication number
- CN107193316A CN107193316A CN201610147386.8A CN201610147386A CN107193316A CN 107193316 A CN107193316 A CN 107193316A CN 201610147386 A CN201610147386 A CN 201610147386A CN 107193316 A CN107193316 A CN 107193316A
- Authority
- CN
- China
- Prior art keywords
- circuit
- relay
- isolation
- bus
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Fuses (AREA)
Abstract
The present invention relates to circuit protection technical field, and in particular to a kind of bus isolation circuit of anti-short-circuit protection, it is therefore an objective to solves in the environment of a moist or water-immerged, the problem of output port of instrument is likely to occur short circuit and damages internal precision circuit.Characterized in that, it includes relay K1, 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 is connected with power port, one end connection of the other end and relay；The other end of relay is connected between internal power cord, signal wire and outside connector contact respectively by multiple relay contact switch, connects into normally open.The present invention is simple in construction, ingenious, and electromagnetic relay is used only in this bus isolation circuit and controlling switch is achieved that instrument internal and outside buffer action.This isolation circuit realizes complete physical isolation using mechanical switch, prevents the damage of the sneak path that is likely to occur in electronic circuit to instrument internal circuit.
Description
Technical field
The present invention relates to circuit protection technical field, and in particular to a kind of bus isolation circuit of anti-short-circuit protection.
Background technology
The external interface of electrical equipment and instrument, including power supply interface and various data bus interfaces are by connecing
Need to consider during the medium external connection such as plug-in unit interface circuit short circuit, open circuit, excessively stream, it is over-pressed when
Safeguard measure.If internal electric source output short-circuit, excessive electric current causes temperature drastically to raise and damages 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 in output end
Road, which will also result in output overcurrent and protect, causes data-transformation facility failure.The short circuit guarantor of conventional power output end
Shield measure has using output overcurrent observation circuit or protective resistance of being connected on power supply output line, overcurrent monitoring electricity
Road generally requires the complicated circuit of design or uses privacy protection device, this to many existing electrical equipments and
Instrument is unpractical.The output short circuit protection of some data/address bus is also required to special protection chip, some
Simple safeguard measure is protective resistance of connecting on the output line, but for many HW High Ways,
The protective resistance of series connection can change the impedance operator of signal output, influence the integrality of signal.
Higher particularly is required to waterproof sealing at some, needs to carry out externally wired power supply and communication link again
The use occasion connect, if outside connector, which dabbles or soaked, can cause external interface short circuit, it is possible to damage
Internal precision circuit
The content of the invention
Present invention aim to address in the environment of a moist or water-immerged, the output port of instrument may go out
The problem of showing short circuit and damage internal precision circuit, there is provided a kind of bus of reliable and stable anti-short-circuit protection
Isolation circuit.
What the present invention was realized in：
A kind of bus isolation circuit of anti-short-circuit protection, including relay K1, 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
One end of mouth connection, the other end and relay is connected；The other end of relay is opened by multiple relay contacts
Pass is connected between internal power cord, signal wire and outside connector contact respectively, connects into normally open.
Relay K1 as described above relay contact switch is N number of altogether.
Relay K1 as described above relay contact switch has eight.
One end of relay contact switch as described above by isolate bus input end respectively with power supply contact
With signalling contact connection, the other end is connected with power port and COM1 respectively by isolating output end of main
Connect；Line pressure shift switch S1 one end is connected by power supply terminal with power port.
Relay K1 and line pressure shift switch S1 as described above is arranged on isolation circuit plate, relay K1
Connected respectively by the form of fly line with isolating output end of main and isolation bus input end.
Isolation circuit plate as described above is made of PCB material, or exhausted using the attached one layer of phenolic resin of aluminium sheet
Edge bakelite plate, which is done, isolates.
The beneficial effects of the invention are as follows：
The present invention includes relay and line pressure shift is switched.Simple in construction, ingenious, this Bus isolation of the invention
Electromagnetic relay is used only in circuit and controlling switch is achieved that instrument internal and outside buffer action.Realize
Physical isolation, compared with using the electrical isolation circuit of transistor or metal-oxide-semiconductor, this isolation circuit uses machinery
Formula switch realizes complete physical isolation, has prevented the sneak path being likely to occur in electronic circuit in instrument
The damage of portion's circuit.Scalability is strong, and the number of buses that this isolation circuit can need according to instrument internal passes through
The number of contacts of increase relay is extended, without causing the complication of circuit in itself.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of the bus isolation circuit of anti-short-circuit protection of the present invention；
Fig. 2 is a kind of eight channel bus isolation circuit cloth of the bus isolation circuit of anti-short-circuit protection of the present invention
Office's figure.
Embodiment
The present invention is described further with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, a kind of bus isolation circuit of anti-short-circuit protection, including relay K1, 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, one end connection of the other end and relay.The other end of relay leads to
Multiple relay contact switch are crossed to be connected on respectively between internal power cord, signal wire and outside connector contact,
Connect into normally open.
As depicted in figs. 1 and 2, relay K1 relay coil has three, and relay contact switch is common
There is N each, in the present embodiment N=8, it is adaptable to eight channel bus.One end of relay contact switch passes through
Isolation bus input end is connected with power supply contact and signalling contact respectively, and the other end is exported by isolating bus
Terminal is connected with COM1 and power port respectively.Line pressure shift switch S1 one end by power supply terminal with
Power port is connected.
Relay K1 and line pressure shift switch S1 are arranged on isolation circuit plate, and isolation circuit plate uses PCB
Material is made, and can also use aluminium sheet, and attached one layer of phenolic resin insulating cement plank does and isolated.Relay K1
Connected respectively by the form of fly line with isolating output end of main and isolation bus input end.
The present invention is simple in construction, easy to implement, and isolation effect significantly, 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. a kind of bus isolation circuit of anti-short-circuit protection, it is characterised in that：It includes relay K1, pressure
Displacement switch S1, isolation bus input end, isolation output end of main and power supply terminal；Line pressure shift is opened
One end of pass is connected with power port, one end connection of the other end and relay；The other end of relay passes through
Multiple relay contact switch are connected between internal power cord, signal wire and outside connector contact respectively,
Connect into normally open.
2. the bus isolation circuit of anti-short-circuit protection according to claim 1, it is characterised in that：It is described
Relay K1 relay contact switch altogether it is N number of.
3. the bus isolation circuit of anti-short-circuit protection according to claim 2, it is characterised in that：It is described
Relay contact switch have eight.
4. the bus isolation circuit of anti-short-circuit protection according to claim 1, it is characterised in that：It is described
One end of relay contact switch connected respectively with power supply contact and signalling contact by isolating bus input end
Connect, the other end is connected with power port and COM1 respectively by isolating output end of main；Line pressure shift
Switch S1 one end is connected by power supply terminal with power port.
5. the bus isolation circuit of anti-short-circuit protection according to claim 1, it is characterised in that：It is described
Relay K1 and line pressure shift switch S1 be arranged on isolation circuit plate, relay K1 respectively by fly
The form of line is connected with isolating output end of main and isolation bus input end.
6. the bus isolation circuit of anti-short-circuit protection according to claim 5, it is characterised in that：It is described
Isolation circuit plate be made of PCB material, or using 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 |
|---|---|---|---|
| CN201610147386.8A CN107193316A (en) | 2016-03-15 | 2016-03-15 | A kind of bus isolation circuit of anti-short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147386.8A CN107193316A (en) | 2016-03-15 | 2016-03-15 | A kind of bus isolation circuit of anti-short-circuit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107193316A true CN107193316A (en) | 2017-09-22 |
Family
ID=59872019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610147386.8A Pending CN107193316A (en) | 2016-03-15 | 2016-03-15 | A kind of bus isolation circuit of anti-short-circuit protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107193316A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117214482A (en) * | 2023-11-09 | 2023-12-12 | 忱芯电子(苏州)有限公司 | Semiconductor power module leakage current test circuit, method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635450A (en) * | 2008-07-21 | 2010-01-27 | 赵玲 | Circuit water-proof device |
| CN102244507A (en) * | 2011-06-24 | 2011-11-16 | 崔万恒 | High-voltage DC (direct current) switching circuit and switching-on/off method thereof |
| CN204423046U (en) * | 2015-02-04 | 2015-06-24 | 青岛鼎信通讯股份有限公司 | Buses isolator |
| CN205540382U (en) * | 2016-03-15 | 2016-08-31 | 北京航天斯达科技有限公司 | Prevent short -circuit protection's bus buffer circuit |
-
2016
- 2016-03-15 CN CN201610147386.8A patent/CN107193316A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635450A (en) * | 2008-07-21 | 2010-01-27 | 赵玲 | Circuit water-proof device |
| CN102244507A (en) * | 2011-06-24 | 2011-11-16 | 崔万恒 | High-voltage DC (direct current) switching circuit and switching-on/off method thereof |
| CN204423046U (en) * | 2015-02-04 | 2015-06-24 | 青岛鼎信通讯股份有限公司 | Buses isolator |
| CN205540382U (en) * | 2016-03-15 | 2016-08-31 | 北京航天斯达科技有限公司 | Prevent short -circuit protection's bus buffer circuit |
Non-Patent Citations (1)
| Title |
|---|
| "《电工技能入门与突破》" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117214482A (en) * | 2023-11-09 | 2023-12-12 | 忱芯电子(苏州)有限公司 | Semiconductor power module leakage current test circuit, method and system |
| CN117214482B (en) * | 2023-11-09 | 2024-02-09 | 忱芯电子(苏州)有限公司 | Semiconductor power module leakage current test circuit, method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104603906A (en) | Fuse failure display | |
| SE8106947L (en) | DEVICE FOR OVERHEATING AND OVERVOLTAGE IN A VOLTAGE LIMIT CIRCUIT | |
| ATE524859T1 (en) | SURGE PROTECTION DEVICE | |
| KR20140123945A (en) | Transient control technology circuit | |
| JP5615406B2 (en) | Connector circuit and surge protection device | |
| CN107193316A (en) | A kind of bus isolation circuit of anti-short-circuit protection | |
| CN104377647A (en) | Electric leakage protection circuit | |
| CN205540382U (en) | Prevent short -circuit protection's bus buffer circuit | |
| CN207527789U (en) | A kind of HomeBus interface circuits | |
| CN208368568U (en) | A kind of battery pack and electrical equipment | |
| CN104183432B (en) | A kind of pre paid functionality chopper | |
| CN104113054B (en) | Prevent from collecting the combined type thunder resisting equipment that recording electric energy meter is destroyed by thunder and lightning | |
| CN109546613B (en) | Power line leakage current detection protection device | |
| KR101369856B1 (en) | Hybrid surge protective device joined to network equipment with power over ethernet | |
| CN110365322A (en) | A kind of digital output card | |
| CN203326590U (en) | Signal circuit lightning protection device | |
| CN205753343U (en) | A kind of can the high-speed interface protection circuit of self adaptation break-make | |
| CN203895969U (en) | Power surge protector | |
| CN211402573U (en) | Electric heater and air conditioner | |
| CN107134766B (en) | A kind of lightning protection circuit | |
| CN213753984U (en) | Voltage dependent resistor test protection device | |
| KR100988946B1 (en) | Surge protection apparatus, protection apparatus for supplying power having the same | |
| CN209231444U (en) | External leakage-current alarm module | |
| CN206023200U (en) | A kind of power supply lightning protection device | |
| CN106026015B (en) | A kind of Line over-voltage protection circuit with over voltage alarm tripping |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170922 |