CN206349739U - A kind of tandem alternating current-direct current short-circuit protection circuit - Google Patents
A kind of tandem alternating current-direct current short-circuit protection circuit Download PDFInfo
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- CN206349739U CN206349739U CN201621438278.8U CN201621438278U CN206349739U CN 206349739 U CN206349739 U CN 206349739U CN 201621438278 U CN201621438278 U CN 201621438278U CN 206349739 U CN206349739 U CN 206349739U
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- circuit
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- semiconductor switch
- switch pipe
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Abstract
The utility model is related to a kind of tandem alternating current-direct current short-circuit protection circuit, including isolated drive circuit, the input of isolated drive circuit is control signal input, its output end is successively through semiconductor switch pipe one, the control end of semiconductor switch Guan Eryu semiconductor switch pipe three is connected, the input 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 of release circuit is connected with the input of isolated drive circuit, its output end is connected with the control end of semiconductor switch pipe two, the input of on off state Acquisition Circuit is connected with the input 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 utility model realize short trouble protection and trouble shooting can self-identifying with recovering function, effectively ensure the safety of associate device and signal transduction pathway, reduce the complexity of railway signal maintenance work.
Description
Technical field
The utility model is related to railway signal technology field, and in particular to a kind of tandem alternating current-direct current short-circuit protection circuit.
Background technology
In being applied in railway signal system, DC signal, ac signal are a conventional electric signals, in order to protect
There is short circuit risk in signal transduction pathway, need to by alterating and direct current signal type, corresponding guarantor is sealed in signal transduction pathway
Shield switch, if needing manual reset protection switch after protection switch action caused by short circuit is occurred in that in signals transmission, this
Certain complexity is brought in being worked to signal maintenance.
Utility model content
The purpose of this utility model is to provide a kind of tandem alternating current-direct current short-circuit protection circuit, realizes that short trouble is protected
And trouble shooting can self-identifying with recovering function, effectively ensure the safety of associate device and signal transduction pathway, reduce railway
The complexity of signal maintenance work.
To achieve the above object, the utility model employs 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 on off state Acquisition Circuit are closed, it is described
The input of isolated drive circuit is control signal input, and its output end is connected with the input of semiconductor switch pipe one, half
The output end of conductor switching tube one is connected with the input of semiconductor switch pipe two, and the output end of semiconductor switch pipe two is with partly leading
The control end of body switching tube three is connected, and the input 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 of the release circuit and the input of isolated drive circuit
It is connected, its output end is connected with the control end of semiconductor switch pipe two, and the input of the on off state Acquisition Circuit is with partly leading
The input of body switching tube three is connected, and its output end is connected with release circuit, and another input and output side of rectifier circuit is
External circuit interface end.
It is used as the further improvement of above-mentioned technical proposal：
The release circuit includes monostable unblock protection circuit and control circuit, the monostable unblock protection circuit
Input is connected with the input of isolated drive circuit, and its output end controls the defeated of circuit with controlling the input of circuit to be connected
Go out end with the control end of semiconductor switch pipe two to be connected, control the input and the output end phase of on off state Acquisition Circuit of circuit
Even.
The current foldback circuit includes short circuit current flow Acquisition Circuit, filter circuit and current comparison circuit, the short circuit
The input of current collection circuit is connected with the output end of semiconductor switch pipe three, and the filtered circuit of its output end is compared with electric current
The input of circuit is connected, and the output end of current comparison circuit is connected with the input of semiconductor switch pipe one.
Also include excessively stream fuse, the excessively stream fuse is installed on the output end of rectifier circuit.
As shown from the above technical solution, the utility model the control signal and circuit that circuit is inputted in itself between using electricity
Device is isolated, it is ensured that electrical safety performance.Semiconductor switch pipe is used in circuit as major loop switch element, it is ensured that therefore
Hinder the response speed of protection, it also avoid switch and produced in closure with disconnecting the electric arc of moment.Circuit can pass through control signal
To control the path conducting and cut-off with external interface.Circuit can keep the off-state with external interface after short trouble, therefore
Circuit is controllable after barrier is released recovers with external interface path for conducting state.When being off-state with external interface, control can be stopped
The output of signal processed recovers the output of control signal to control to turn on external interface again.Circuit control passes through with external interface
Electric current can be that alternating current can also be DC current.
Brief description of the drawings
Fig. 1 is circuit block diagram of the present utility model；
Fig. 2 is application principle block diagram of the present utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
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
With on off state Acquisition Circuit 10, the input of isolated drive circuit 2 is control signal input, and its output end is opened with semiconductor
The input for closing pipe 1 is connected, and the output end of semiconductor switch pipe 1 is connected with the input of semiconductor switch pipe 26, partly leads
The output end of body switching tube 26 is connected with the control end of semiconductor switch pipe 39, the input 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 with the input of isolated drive circuit 2 to be connected, its output end is connected with the control end of semiconductor switch pipe 26, switch shape
The input of state Acquisition Circuit 10 is connected with the input of semiconductor switch pipe 39, and its output end is connected with release circuit, rectification
Another input and output side of bridge circuit 12 is external circuit interface end, and being provided with excessively stream in the output end of rectifier circuit 12 melts
Silk 11.
In the present embodiment, release circuit includes monostable unblock protection circuit 1 and control circuit 7, monostable unblock protection
The input of circuit 1 is connected with the input of isolated drive circuit 2, and its output end is controlled with controlling the input of circuit 7 to be connected
The output end of circuit 7 is connected with the control end of semiconductor switch pipe 26, and the input and on off state for controlling circuit 7 gather electricity
The output end on road 10 is connected.Current foldback circuit includes short circuit current flow Acquisition Circuit 8, filter circuit 5 and current comparison circuit 3,
The input of short circuit current flow Acquisition Circuit 8 is connected with the output end of semiconductor switch pipe 39, the filtered circuit 5 of its output end with
The input of current comparison circuit 3 is connected, and the output end of current comparison circuit 3 is connected with the input of semiconductor switch pipe 1.
As shown in Fig. 2 sealing in load power source and alternating current-direct current load circuit with external interface during the utility model specific implementation
In.Control signal is provided to circuit described in the utility model by CPU processor, the conducting with external interface is controlled with cutting
Only, the work and stopping of control alternating current-direct current load.CPU processor is when it is conducting state to control circuit 7 with external interface, and state takes
Sample circuit exports a level signal to CPU by isolation circuit and gathered for CPU with analyzing.When CPU control alternating current-direct current load electricity
When stream is connected, if alternating current-direct current load short trouble triggers circuit occurs and stops output in protection all the time, CPU can be by checking shape
State sample circuit and the level signal of isolation circuit output recognize circuit and are not turned on, and CPU can stop to circuit output control
Signal processed, can also stop recovering output after output again, attempt 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, comprises the following steps：
S1：The control signal driving monostable unblock protection circuit 1 and isolated drive circuit 2 of outside input work simultaneously,
The output drive signal of level semiconductor switching tube 1 backward of isolated drive circuit 2, monostable unlocks protection circuit 1 to control circuit 7
Export unlocking signal；
S2：Control circuit 7 is received controls semiconductor switch pipe 26 to turn on after unlocking signal, and then drive signal is defeated
Go out to semiconductor switch pipe 39, turn on semiconductor switch pipe 39；Control signal stops, and isolated drive circuit 2 stops output；
Semiconductor switch pipe 1 and semiconductor switch 26 stop output drive signal, control the output protection signal of circuit 7, and control is partly led
The cut-off output of body switch two, semiconductor switch three ends, and causes to disconnect stopping output with external interface；
S3：When short circuit current occurs in external interface, rectifier bridge, the conducting electric current of semiconductor switch pipe 39 are sharply increased,
Short circuit current flow Acquisition Circuit 8 collects after over-current signal that circuit 5 is exported to current comparison circuit 3 after filtering short-circuit 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.On off state Acquisition Circuit 10 collects the backward control circuit 7 of the cut-off of semiconductor switch pipe 39
Output protection signal, control circuit 7 is controlled all the time in the case where monostable solution protection circuit does not export solution protection signal also
Semiconductor switch pipe 26 ends.
S4：When external interface stops exporting by short circuit current circuit, on off state Acquisition Circuit 10 is short using outside
Loop current behind road, recognizes short trouble and is not released from also, now to the control output external fault conditions signal of circuit 7,
Control circuit 7 realizes that circuit stops output by controlling semiconductor switch pipe 26 and semiconductor switch pipe 39 to stop exporting,
Circuit is kept without output in the case that external short circuit failure is not released from also；
In the case where not released also with external interface short trouble, on off state Acquisition Circuit 10 is remained to protection
Circuit output protection signal, realizes short circuit current flow cut-off and is kept with state.Now due to the cut-off of semiconductor switch pipe 39,
Short circuit current flow Acquisition Circuit 8 can not collect current signal, and current comparison circuit 3, which can recover semiconductor switch pipe 1 immediately, leads
It is logical, but semiconductor switch pipe 26 is retained as off-state, is misled into leading to so also not interfering with semiconductor switch pipe 39.
S5：After external interface is by short circuit current trouble shooting, on off state Acquisition Circuit 10 collects short without outside
During the electric current on road, then recognize short trouble and be released from, the control control semiconductor switch of circuit 7 pipe 26 and semiconductor switch
Pipe 39 is output as conducting, and circuit recovers output.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New scope is defined, on the premise of the utility model design spirit is not departed from, and those of ordinary skill in the art are to this
Various modifications and improvement that the technical scheme of utility model is made, all should fall into the protection of the utility model claims determination
In the range of.
Claims (4)
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
First, semiconductor switch pipe two, semiconductor switch pipe three, rectifier circuit, release circuit, current foldback circuit and on off state are adopted
Collector, the input of the isolated drive circuit is control signal input, and its 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 of semiconductor switch pipe two, semiconductor switch pipe two
Output end is connected with the control end of semiconductor switch pipe three, the input of semiconductor switch pipe three and the output end of rectifier circuit
It is connected, the output end of semiconductor switch pipe three is connected with current foldback circuit, the input and isolation drive of the release circuit
The input of circuit is connected, and its output end is connected with the control end of semiconductor switch pipe two, the on off state Acquisition Circuit
Input is connected with the input of semiconductor switch pipe three, and its output end is connected with release circuit, rectifier circuit it is another defeated
It is external circuit interface end to enter with output end.
2. tandem alternating current-direct current short-circuit protection circuit according to claim 1, it is characterised in that：The release circuit includes
Monostable unlocks protection circuit and control circuit, the input of monostable unblock protection circuit and isolated drive circuit it is defeated
Enter end to be connected, its output end controls the output end of circuit and the control of semiconductor switch pipe two with controlling the input of circuit to be connected
End processed is connected, and the input of control circuit is connected with the output end of on off 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 flow Acquisition Circuit, filter circuit and current comparison circuit, the input of the short circuit current flow Acquisition Circuit and half
The output end of conductor switching tube three is connected, and the filtered circuit of its output end is connected with the input of current comparison circuit, electric current ratio
Output end compared with circuit is connected with the input of semiconductor switch pipe one.
4. tandem alternating current-direct current short-circuit protection circuit according to claim 1, it is characterised in that：Also include excessively stream fuse,
The excessively stream fuse is installed on the output end of rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621438278.8U CN206349739U (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621438278.8U CN206349739U (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206349739U true CN206349739U (en) | 2017-07-21 |
Family
ID=59321667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621438278.8U Expired - Fee Related CN206349739U (en) | 2016-12-26 | 2016-12-26 | A kind of tandem alternating current-direct current short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206349739U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532628A (en) * | 2016-12-26 | 2017-03-22 | 合肥工大高科信息科技股份有限公司 | Serial AC-DC short circuit protection circuit and protection method thereof |
| CN109725190A (en) * | 2019-03-25 | 2019-05-07 | 贵州航天天马机电科技有限公司 | A kind of alternating current-direct current signal multiple sampling protection system |
-
2016
- 2016-12-26 CN CN201621438278.8U patent/CN206349739U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532628A (en) * | 2016-12-26 | 2017-03-22 | 合肥工大高科信息科技股份有限公司 | Serial AC-DC short circuit protection circuit and protection method thereof |
| CN109725190A (en) * | 2019-03-25 | 2019-05-07 | 贵州航天天马机电科技有限公司 | A kind of alternating current-direct current signal multiple sampling protection system |
| CN109725190B (en) * | 2019-03-25 | 2020-11-03 | 贵州航天天马机电科技有限公司 | Alternating current-direct current signal multiple sampling protection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170721 Termination date: 20201226 |