CN106532628B - A kind of tandem alternating current-direct current short-circuit protection circuit and its guard method - Google Patents
A kind of tandem alternating current-direct current short-circuit protection circuit and its guard method Download PDFInfo
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- CN106532628B CN106532628B CN201611219867.1A CN201611219867A CN106532628B CN 106532628 B CN106532628 B CN 106532628B CN 201611219867 A CN201611219867 A CN 201611219867A CN 106532628 B CN106532628 B CN 106532628B
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- circuit
- semiconductor switch
- switch pipe
- input terminal
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
Abstract
The present invention relates to a kind of tandem alternating current-direct current short-circuit protection circuit and its guard methods, including isolated drive circuit, the input terminal of isolated drive circuit is control signal input, its output end is successively through semiconductor switch pipe one, the control terminal of semiconductor switch Guan Eryu semiconductor switch pipe three is connected, the input terminal of semiconductor switch pipe three is connected with the output end of rectifier circuit, the output end of semiconductor switch pipe three is connected with current foldback circuit, the input terminal of release circuit is connected with the input terminal of isolated drive circuit, its output end is connected with the control terminal of semiconductor switch pipe two, the input terminal of switch state Acquisition Circuit is connected with the input terminal of semiconductor switch pipe three, its output end is connected with release circuit, another input and output side of rectifier circuit is external circuit interface end.The present invention, which realizes short trouble protection and trouble shooting, self-identifying and to restore function, effectively ensure the safety of associate device and signal transduction pathway, reduce the complexity of railway signal maintenance work.
Description
Technical field
The present invention relates to railway signal technology fields, and in particular to a kind of tandem alternating current-direct current short-circuit protection circuit and its guarantor
Maintaining method.
Background technique
In applying in railway signal system, DC signal, ac signal are a common electric signals, in order to protect
There is short circuit risk in signal transduction pathway, corresponding guarantor need to be sealed in signal transduction pathway by the signal type of alterating and direct current
Shield switch, if needing manual reset protective switch after occurring short-circuit caused protective switch movement in signals transmission, this
To signal maintenance work in bring certain complexity.
Summary of the invention
The purpose of the present invention is to provide a kind of tandem alternating current-direct current short-circuit protection circuit and its guard methods, realize short circuit
Error protection and trouble shooting self-identifying and can restore function, effectively ensure the safety of associate device and signal transduction pathway,
Reduce the complexity of railway signal maintenance work.
To achieve the above object, the invention adopts the following technical scheme:
A kind of tandem alternating current-direct current short-circuit protection circuit, including isolated drive circuit, semiconductor switch pipe one, semiconductor are opened
Pipe two, semiconductor switch pipe three, rectifier circuit, release circuit, current foldback circuit and switch state Acquisition Circuit are closed, it is described
The input terminal of isolated drive circuit is control signal input, and output end is connected with the input terminal of semiconductor switch pipe one, half
The output end of conductor switching tube one is connected with the input terminal of semiconductor switch pipe two, the output end of semiconductor switch pipe two with partly lead
The control terminal of body switching tube three is connected, and the input terminal of semiconductor switch pipe three is connected with the output end of rectifier circuit, semiconductor
The output end of switching tube three is connected with current foldback circuit, the input terminal of the release circuit and the input terminal of isolated drive circuit
Be connected, output end is connected with the control terminal of semiconductor switch pipe two, the input terminal of the switch state Acquisition Circuit with partly lead
The input terminal of body switching tube three is connected, and output end is connected with release circuit, and another input and output side of rectifier circuit is
External circuit interface end.
As a further improvement of the above technical scheme:
The release circuit includes monostable unlock protection circuit and control circuit, and circuit is protected in the monostable unlock
Input terminal is connected with the input terminal of isolated drive circuit, and output end is connected with the input terminal of control circuit, control circuit it is defeated
Outlet is connected with the control terminal of semiconductor switch pipe two, the input terminal and the output end phase of switch state Acquisition Circuit of control circuit
Even.
The current foldback circuit includes short circuit current Acquisition Circuit, filter circuit and current comparison circuit, the short circuit
The input terminal of current collection circuit is connected with the output end of semiconductor switch pipe three, and output end is through filter circuit compared with electric current
The input terminal of circuit is connected, and the output end of current comparison circuit is connected with the input terminal of semiconductor switch pipe one.
It further include overcurrent fuse, the overcurrent fuse is installed on the output end of current rectifying and wave filtering circuit.
A kind of guard method of tandem alternating current-direct current short-circuit protection circuit, comprising the following steps:
(1) externally input control signal driving monostable unlock protection circuit and isolated drive circuit work at the same time, every
From driving circuit, one output drive signal of level semiconductor switching tube, monostable unlock protection circuit export solution to control circuit backward
Lock signal；
(2) control semiconductor switch pipe two is connected after control circuit receives unlocking signal, and then driving signal is exported
To semiconductor switch pipe three, semiconductor switch pipe three is connected；
(3) when short circuit current occurs in external interface, current foldback circuit collects fault-signal, to the fault-signal into
After row filtering and overcurrent judgement, control semiconductor switch pipe one ends, at this point, semiconductor switch pipe two and semiconductor switch pipe three
Cut-off, circuit stop output；
(4) when external interface stops output by short circuit current circuit, switch state Acquisition Circuit utilizes external short circuit
Loop current afterwards recognizes short trouble and is not released from also, exports external fault conditions signal, control to control circuit at this time
Circuit stops output by control semiconductor switch pipe two and semiconductor switch pipe three, realizes that circuit stops output, external short
Circuit is kept without output in the case that road failure is not released from also；
(5) after external interface passes through short circuit current trouble shooting, switch state Acquisition Circuit collects no external short circuit
Electric current when, then recognize short trouble and be released from, control circuit controls semiconductor switch pipe two and semiconductor switch pipe three
Output is conducting, and circuit restores output.
As shown from the above technical solution, the present invention between the control signal that circuit inputs and circuit itself using electric appliance every
From, it is ensured that electrical safety performance.It is semiconductor switch pipe used in circuit as major loop switch element, it is ensured that failure is protected
The response speed of shield also avoids switching in closure and the electric arc generation for disconnecting moment.Circuit can be controlled by control signal
System is connected and cut-off with the access of external interface.Circuit can keep the off-state with external interface, failure solution after short trouble
Except rear circuit is controllable and external interface access is conducting state recovery.When being off-state with external interface, control letter can be stopped
Number output restore again control signal output be connected to control with external interface.Circuit control and external interface pass through electric current
It can be alternating current and be also possible to DC current.
Detailed description of the invention
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is application principle block diagram of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
As shown in Figure 1, the tandem alternating current-direct current short-circuit protection circuit of the present embodiment, including isolated drive circuit 2, semiconductor
Switching tube 1, semiconductor switch pipe 26, semiconductor switch pipe 39, rectifier circuit 12, release circuit, current foldback circuit
Input terminal with switch state Acquisition Circuit 10, isolated drive circuit 2 is control signal input, and output end is opened with semiconductor
The input terminal for closing pipe 1 is connected, and the output end of semiconductor switch pipe 1 is connected with the input terminal of semiconductor switch pipe 26, partly leads
The output end of body switching tube 26 is connected with the control terminal of semiconductor switch pipe 39, the input terminal of semiconductor switch pipe 39 with it is whole
Flow bridge circuit 12 output end be connected, the output end of semiconductor switch pipe 39 is connected with current foldback circuit, release circuit it is defeated
Enter end to be connected with the input terminal of isolated drive circuit 2, output end is connected with the control terminal of semiconductor switch pipe 26, switchs shape
The input terminal of state Acquisition Circuit 10 is connected with the input terminal of semiconductor switch pipe 39, and output end is connected with release circuit, rectification
Another input and output side of bridge circuit 12 is external circuit interface end, and it is molten to be equipped with overcurrent in the output end of rectifier circuit 12
Silk 11.
In the present embodiment, release circuit includes monostable unlock protection circuit 1 and control circuit 7, monostable unlock protection
The input terminal of circuit 1 is connected with the input terminal of isolated drive circuit 2, and output end is connected with the input terminal of control circuit 7, control
The output end of circuit 7 is connected with the control terminal of semiconductor switch pipe 26, input terminal and switch state the acquisition electricity of control circuit 7
The output end on road 10 is connected.Current foldback circuit includes short circuit current Acquisition Circuit 8, filter circuit 5 and current comparison circuit 3,
The input terminal of short circuit current Acquisition Circuit 8 is connected with the output end of semiconductor switch pipe 39, output end through filter circuit 5 with
The input terminal of current comparison circuit 3 is connected, and the output end of current comparison circuit 3 is connected with the input terminal of semiconductor switch pipe 1.
As shown in Fig. 2, being sealed in load power source and alternating current-direct current load circuit when the present invention is embodied with external interface.It is logical
It crosses CPU processor and provides control signal to circuit of the present invention, control the conducting and cut-off with external interface, control is handed over
The work and stopping of DC load.For CPU processor when control circuit 7 and external interface are conducting state, state sample circuit is logical
Isolation circuit is crossed to export a level signal for CPU acquisition to CPU and analyze.When CPU control alternating current-direct current load current is connected,
If short trouble trigger circuit, which occurs, in alternating current-direct current load is in the output of protection stopping always, CPU can sample electricity by inspection state
The level signal of road and isolation circuit output recognizes circuit and is not turned on, and CPU can stop controlling signal to circuit output,
Restore to export again after can stopping output, attempts alternating current-direct current load and be again switched on electric current.
The guard method of the tandem alternating current-direct current short-circuit protection circuit of the present embodiment, comprising the following steps:
S1: externally input control signal driving monostable unlock protection circuit 1 and isolated drive circuit 2 work at the same time,
One 4 output drive signal of level semiconductor switching tube, monostable unlock protect circuit 1 to control circuit 7 to isolated drive circuit 2 backward
Export unlocking signal；
S2: control semiconductor switch pipe 26 is connected after control circuit 7 receives unlocking signal, and then driving signal is defeated
Semiconductor switch pipe 39 is arrived out, and semiconductor switch pipe 39 is connected；It controls signal to stop, isolated drive circuit 2 stops output；
Semiconductor switch pipe 1 and semiconductor switch 26 stop output drive signal, 7 output protection signal of control circuit, and control is partly led
The cut-off output of body switch two, semiconductor switch three end, and cause to disconnect stopping output with external interface；
S3: when there is short circuit current in external interface, rectifier bridge, semiconductor switch pipe 39 conducting electric current sharply increase,
Short circuit current Acquisition Circuit 8 exports short-circuit signal to current comparison circuit 3 by filter circuit 5 after collecting over-current signal,
Control semiconductor switch pipe 1 stops output after current comparison circuit 3 is triggered, and then semiconductor switch pipe 26 stops output,
Semiconductor switch pipe 39 ends.Switch state Acquisition Circuit 10 collects after semiconductor switch pipe 39 ends to control circuit 7
Output protection signal, control circuit 7 control always in the case where monostable solution protection circuit output solution protection signal not yet
Semiconductor switch pipe 26 ends.
S4: when external interface stops output by short circuit current circuit, switch state Acquisition Circuit 10 is short using outside
Loop current behind road recognizes short trouble and is not released from also, exports external fault conditions signal to control circuit 7 at this time,
Control circuit 7 stops output by control semiconductor switch pipe 26 and semiconductor switch pipe 39, realizes that circuit stops output,
Circuit is kept without output in the case that external short circuit failure is not released from also；
In the case where not releasing also with external interface short trouble, switch state Acquisition Circuit 10 is remained to protection
Circuit output protects signal, realizes short circuit current cut-off and keeps with state.At this time due to the cut-off of semiconductor switch pipe 39,
Short circuit current Acquisition Circuit 8 can not collect current signal, and current comparison circuit 3 can recover immediately semiconductor switch pipe 1 and lead
It is logical, but semiconductor switch pipe 26 is maintained as off-state, thus will not influence semiconductor switch pipe 39 be misled into it is logical.
S5: after external interface passes through short circuit current trouble shooting, switch state Acquisition Circuit 10 is collected without external short
It when the electric current on road, then recognizes short trouble and has been released from, control circuit 7 controls semiconductor switch pipe 26 and semiconductor switch
The output of pipe 39 is conducting, and circuit restores output.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (5)
1. a kind of tandem alternating current-direct current short-circuit protection circuit, it is characterised in that: including isolated drive circuit, semiconductor switch pipe
One, semiconductor switch pipe two, semiconductor switch pipe three, rectifier circuit, release circuit, current foldback circuit and switch state are adopted
The input terminal of collector, the isolated drive circuit is control signal input, and output end is defeated with semiconductor switch pipe one
Enter end to be connected, the output end of semiconductor switch pipe one is connected with the input terminal of semiconductor switch pipe two, semiconductor switch pipe two
Output end is connected with the control terminal of semiconductor switch pipe three, and the first of the input terminal of semiconductor switch pipe three and rectifier circuit is defeated
Outlet be connected, the output end of semiconductor switch pipe three is connected with current foldback circuit, the input terminal of the release circuit be isolated
The input terminal of driving circuit is connected, and output end is connected with the control terminal of semiconductor switch pipe two, the switch state acquisition electricity
The input terminal on road is connected with the input terminal of semiconductor switch pipe three, and output end is connected with release circuit, rectifier circuit it is another
One input terminal and second output terminal are external circuit interface end, the input terminal company of current foldback circuit and semiconductor switch pipe one
It connects.
2. tandem alternating current-direct current short-circuit protection circuit according to claim 1, it is characterised in that: the release circuit includes
Monostable unlock protection circuit and control circuit, the monostable unlock the defeated of the input terminal and isolated drive circuit for protecting circuit
Enter end to be connected, output end is connected with the input terminal of control circuit, the control of the output end and semiconductor switch pipe two of control circuit
End processed is connected, and the input terminal of control circuit is connected with the output end of switch state Acquisition Circuit.
3. tandem alternating current-direct current short-circuit protection circuit according to claim 1, it is characterised in that: the current foldback circuit
Including short circuit current Acquisition Circuit, filter circuit and current comparison circuit, the input terminal of the short circuit current Acquisition Circuit and half
The output end of conductor switching tube three is connected, and output end is connected through filter circuit with the input terminal of current comparison circuit, electric current ratio
Output end compared with circuit is connected with the input terminal of semiconductor switch pipe one.
4. tandem alternating current-direct current short-circuit protection circuit according to claim 1, it is characterised in that: it further include overcurrent fuse,
The overcurrent fuse is installed on the second output terminal of rectifier circuit.
5. the guard method of tandem alternating current-direct current short-circuit protection circuit according to claim 2, which is characterized in that including with
Lower step:
(1) externally input control signal driving monostable unlock protection circuit and isolated drive circuit work at the same time, and isolation is driven
One output drive signal of level semiconductor switching tube, monostable unlock protection circuit export unlock letter to control circuit to dynamic circuit backward
Number；
(2) control semiconductor switch pipe two is connected after control circuit receives unlocking signal, and then driving signal is output to half
Semiconductor switch pipe three is connected in conductor switching tube three；
(3) when short circuit current occurs in external interface, current foldback circuit collects fault-signal, filters to the fault-signal
After wave and overcurrent judgement, control semiconductor switch pipe one ends, at this point, semiconductor switch pipe two and semiconductor switch pipe three are cut
Only, circuit stops output；
(4) when external interface stops output by short circuit current circuit, after switch state Acquisition Circuit utilizes external short circuit
Loop current recognizes short trouble and is not released from also, exports external fault conditions signal, control circuit to control circuit at this time
By control semiconductor switch pipe two and the stopping output of semiconductor switch pipe three, realize that circuit stops output, in external short circuit event
Circuit is kept without output in the case that barrier is not released from also；
(5) after external interface passes through short circuit current trouble shooting, switch state Acquisition Circuit collects the electricity of no external short circuit
It when stream, then recognizes short trouble and has been released from, control circuit controls semiconductor switch pipe two and semiconductor switch pipe three exports
For conducting, circuit restores output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611219867.1A CN106532628B (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit and its guard method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611219867.1A CN106532628B (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit and its guard method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106532628A CN106532628A (en) | 2017-03-22 |
| CN106532628B true CN106532628B (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611219867.1A Active CN106532628B (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit and its guard method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102412313B1 (en) | 2018-07-17 | 2022-06-22 | 주식회사 엘지에너지솔루션 | Apparatus and method for diagnosing switch |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0715953A (en) * | 1993-06-25 | 1995-01-17 | Matsushita Electric Ind Co Ltd | Protective circuit for switching power supply |
| CN103094883B (en) * | 2013-01-24 | 2015-03-18 | 深圳市英威腾电气股份有限公司 | Intrinsic safety type power circuit and device with intrinsic safety type power circuit |
| CN103297008B (en) * | 2013-05-16 | 2016-01-20 | 中国铁道科学研究院 | The intelligent drives plate that a kind of isolated form double break exports and driving method |
| CN203632211U (en) * | 2014-01-07 | 2014-06-04 | 漳州科华技术有限责任公司 | Short circuit protective device being capable of self-recovery |
| CN206349739U (en) * | 2016-12-26 | 2017-07-21 | 合肥工大高科信息科技股份有限公司 | A kind of tandem alternating current-direct current short-circuit protection circuit |
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2016
- 2016-12-26 CN CN201611219867.1A patent/CN106532628B/en active Active
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| Publication number | Publication date |
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| CN106532628A (en) | 2017-03-22 |
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