CN206442112U - Multichannel overvoltage crowbar - Google Patents
Multichannel overvoltage crowbar Download PDFInfo
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- CN206442112U CN206442112U CN201720089599.XU CN201720089599U CN206442112U CN 206442112 U CN206442112 U CN 206442112U CN 201720089599 U CN201720089599 U CN 201720089599U CN 206442112 U CN206442112 U CN 206442112U
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- diode
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- optocoupler
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- pole
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Abstract
The utility model provides a kind of multichannel overvoltage crowbar, including：At least positive output over-voltage detection circuit all the way, at least negative output over-voltage detection circuit all the way, optocoupler, diode VD1 and diode VD2, one end of the positive output over-voltage detection circuit is used to connect by the positive output road of protection circuit, the other end is connected with the positive pole of the optocoupler, one end of the negative output over-voltage detection circuit is used to connect by the negative output road of protection circuit, the other end is connected with the negative pole of the optocoupler, the plus earth of the diode VD1, the negative pole of the diode VD1 connects the positive pole of the optocoupler, the negative pole ground connection of the diode VD2, the positive pole of the diode VD2 connects the negative pole of the optocoupler.The multichannel overvoltage crowbar that the utility model is provided, by minimum device while realizing the right way, negative road, the output over-voltage protection of combining.
Description
Technical field
The utility model is related to a kind of multichannel overvoltage crowbar.
Background technology
When the control loop of Switching Power Supply breaks down, it is possible to the phenomenon of output HIGH voltage can be caused.When defeated
Go out voltage exceed rear class electrical equipment normal permission input voltage range when, it is likely that cause the damage of rear class electrical equipment,
So as to bring immeasurable loss.So we need to set output overvoltage protection circuit in Switching Power Supply, work as power ring
When road is out of control, be not in the too high phenomenon of output voltage, so as to avoid the damage of rear class electrical equipment.
Actual in use, having two-way positive and negative output and the application scenario of other multiple-channel outputs.In conventional multichannel
Only independent overvoltage guarantor can be designed in output overvoltage protection circuit design in the output overvoltage protection circuit of design main road or each road
Protection circuit.The overvoltage protection of main road is only designed, the over-pressed hidden danger on other roads can not be solved fundamentally, design hidden danger, which remains unchanged, deposits
.And independent overvoltage crowbar is designed on each road can cause the numerous and diverse of circuit, more devices design to the space of circuit, into
Sheet, reliability etc. all bring unfavorable factor.
Utility model content
The multichannel overvoltage crowbar provided for defect of the prior art, the utility model, passes through minimum device
The right way, negative road, the output over-voltage protection of combining are realized simultaneously.
A kind of multichannel overvoltage crowbar that the utility model is provided, including：At least all the way positive output over-voltage detection circuit,
At least negative output over-voltage detection circuit, optocoupler, diode VD1 and diode VD2 all the way, the positive output over-voltage detection circuit
One end is used to connect by the positive output road of protection circuit, and the other end is connected with the positive pole of the optocoupler, the negative output overvoltage inspection
One end of slowdown monitoring circuit is used to connect by the negative output road of protection circuit, and the other end is connected with the negative pole of the optocoupler, two pole
Pipe VD1 plus earth, the negative pole of the diode VD1 connects the positive pole of the optocoupler, and the negative pole of the diode VD2 is grounded,
The positive pole of the diode VD2 connects the negative pole of the optocoupler.
The multichannel overvoltage crowbar that the utility model is provided, is only achieved that positive and negative using a photoelectric device (optocoupler)
The independent overvoltage protection of road voltage and combining voltage, circuit is simple, device is few, saves circuit space, cost, improves circuit
Reliability, realizes the overvoltage protection to all output ends with minimum device, reduces potential safety hazard.
Preferably, the positive output over-voltage detection circuit includes voltage-regulator diode VZ2, and the zener diode VZ2 is just
Pole is connected with the positive pole of the optocoupler, and the negative pole of the zener diode VZ2 is used to connect by the positive output road of protection circuit.
Preferably, it is in series with resistance in the positive output over-voltage detection circuit.
Preferably, the negative output over-voltage detection circuit includes the negative of voltage-regulator diode VZ3, the zener diode VZ3
Pole is connected with the negative pole of the optocoupler, and the positive pole of the zener diode VZ3 is used to connect by the negative output road of protection circuit.
Preferably, it is in series with resistance in the negative output over-voltage detection circuit.
Preferably, the diode VD1 and diode VD2 is a bilateral diode.
Brief description of the drawings
The structured flowchart for the multichannel overvoltage crowbar that Fig. 1 is provided by the utility model embodiment；
The circuit diagram for the multichannel overvoltage crowbar that Fig. 2 is provided by the utility model embodiment.
Embodiment
The embodiment of technical solutions of the utility model is described in detail below in conjunction with accompanying drawing.Following examples are only
For clearly illustrating the technical solution of the utility model, therefore example is intended only as, and this reality can not be limited with this
With new protection domain.
It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this reality
The ordinary meaning understood with new one of ordinary skill in the art.
As shown in figure 1, the multichannel overvoltage crowbar that the present embodiment is provided, including：At least positive output overvoltage detection all the way
Circuit, at least negative output over-voltage detection circuit, optocoupler, diode VD1 and diode VD2, positive output over-voltage detection circuit all the way
One end be used to connect by the positive output road of protection circuit, the positive pole of the other end and optocoupler is connected, negative output over-voltage detection circuit
One end be used to connect by the negative output road of protection circuit, the negative pole of the other end and optocoupler is connected, and diode VD1 positive pole connects
Ground, diode VD1 negative pole connects the positive pole of optocoupler, and diode VD2 negative pole ground connection, diode VD2 positive pole connects the negative of optocoupler
Pole.
Operation principle is：When passing by pressure by the positive output of protection circuit, the conducting of positive output over-voltage detection circuit, positive output
Over-voltage detection circuit, optocoupler and diode VD2 formation paths, the light emitting diode that electric current flows through optocoupler cause it to light, now
The signal output part FB output overvoltage signals of optocoupler, according to over-pressed Signal Regulation Switching Power Supply；When by the negative of protection circuit
When output passes by pressure, the conducting of negative output over-voltage detection circuit, negative output over-voltage detection circuit, optocoupler and diode VD1 form logical
Road, the light emitting diode that electric current flows through optocoupler causes it to light, now the signal output part FB output overvoltage signals of optocoupler, according to
Over-pressed Signal Regulation Switching Power Supply；When combining electric voltage over press, the conducting of positive output over-voltage detection circuit, optocoupler, negative output
Over-voltage detection circuit turns on to form path, and the light emitting diode that electric current flows through optocoupler causes it to light, and now the signal of optocoupler is defeated
Go out to hold FB output overvoltage signals, according to over-pressed Signal Regulation Switching Power Supply.
, only need to the overvoltage of the positive output all the way inspection in parallel by existing positive output over-voltage detection circuit when increasing positive output road
Slowdown monitoring circuit；When the negative road output of increase, only need to by existing negative output over-voltage detection circuit negative output mistake all the way in parallel
Pressure detection circuit.Even if therefore there are again many output roads by protection circuit, an optocoupler is all only needed to.
The present embodiment is only achieved that the independent mistake of positive and negative road voltage and combining voltage using a photoelectric device (optocoupler)
Pressure protection, circuit is simple, device is few, saves circuit space, cost, improves circuit reliability, is realized with minimum device
To the overvoltage protection of all output ends, potential safety hazard is reduced.
Wherein, the implementation of positive output over-voltage detection circuit and negative output over-voltage detection circuit has a variety of, as long as output
The implementation of turning circuit effect can be played after the overvoltage of end should all include the present embodiment protection domain.In order to simplify circuit,
Cost is reduced, positive output over-voltage detection circuit is preferred to use voltage-regulator diode VZ2 realizations, zener diode VZ2 positive pole and light
The positive pole connection of coupling, zener diode VZ2 negative pole is used to connect by the positive output road of protection circuit.Negative output overvoltage detection electricity
Road is preferred to use voltage-regulator diode VZ3 realizations, and zener diode VZ3 negative pole and the negative pole of optocoupler are connected, zener diode VZ3
Positive pole be used for connect by the negative output road of protection circuit.Voltage-regulator diode is one kind until all having before critical breakdown reverse voltage
There is very high-resistance semiconductor devices, voltage-regulator diode is in reverse breakdown, in certain current range inner terminal voltage hardly
Become, show stabilizing voltage characteristic.Therefore, it is just defeated once the voltage in circuit has exceeded the critical breakdown reverse voltage of voltage-regulator diode
Go out over-voltage detection circuit or negative output over-voltage detection circuit, so as to reach the purpose of accurate detection overvoltage.Positive output overvoltage all the way
Detect circuit or multiple voltage stabilizing voltage-regulator diodes can be used in negative output over-voltage detection circuit all the way, to meet to different overvoltages
The requirement of threshold value.
To prevent electric current excessive, the electronic device damaged in circuit, per road positive output over-voltage detection circuit, per negative defeated all the way
Go out and resistance is all in series with over-voltage detection circuit.
It is that diode VD1 and diode VD2 can be achieved from a bilateral diode further to reduce the size of circuit
Function.
As Fig. 2 gives a preferred embodiment, positive output over-voltage detection circuit is by resistance R51 and voltage-regulator diode VZ2
Composition, negative output over-voltage detection circuit is made up of resistance R52 and voltage-regulator diode；VD8 is bilateral diode, realizes diode
VD1 and diode VD2 function；The positive output road of resistance R51 connecting valve power supplys, voltage-regulator diode VZ2 positive pole and optocoupler
N3 positive pole connection；The negative output road of resistance R52 connecting valve power supplys, voltage-regulator diode VZ3 negative pole and optocoupler N3 negative pole
Connection, diode VD1 plus earth, diode VD1 negative pole connects the positive pole of optocoupler, diode VD2 negative pole ground connection, two poles
Pipe VD2 positive pole connects the negative pole of optocoupler.
As in Fig. 2, the operation principle of circuit is：When the positive output of Switching Power Supply passes by pressure, puncture VZ2, then R51,
VZ2, N3, VD8 down tube formation path, the light emitting diode that electric current flows through N3 cause it to light, now N3 FB ends output overvoltage
Signal, according to over-pressed Signal Regulation Switching Power Supply；When the negative output of Switching Power Supply passes by pressure, puncture VZ3, then R52,
The upper pipe formation path of VZ3, N3, VD8, the light emitting diode that electric current flows through N3 causes it to light, now N3 FB ends output overvoltage
Signal, according to over-pressed Signal Regulation Switching Power Supply；When combining electric voltage over press, R51, VZ2, N3 primary, VZ3, R52 are formed
Path, the light emitting diode that electric current flows through N3 causes it to light, now N3 FB ends output overvoltage signal, is adjusted according to over-pressed signal
Save Switching Power Supply.
Certainly, also with can be in fig. 2 positive output over-voltage detection circuit and negative output over-voltage detection circuit by respectively simultaneously
Join multichannel positive output over-voltage detection circuit and multichannel negative output over-voltage detection circuit, realize to the switch electricity with more multi output road
The overvoltage protection in source, operation principle is identical, repeats no more.
Being above one is used for the embodiment of Switching Power Supply, and multichannel overvoltage crowbar of the present utility model can be used for
The circuit in need for realizing overvoltage protection, such as：The communication power supply of multiple-channel output, the electric supply of multiple-channel output, multiple-channel output
Railway power supply etc..
Finally it should be noted that：Various embodiments above is only limited to illustrate the technical solution of the utility model, rather than to it
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type, it all should cover among claim of the present utility model and the scope of specification.
Claims (6)
1. a kind of multichannel overvoltage crowbar, it is characterised in that including：At least positive output over-voltage detection circuit, at least one all the way
Road negative output over-voltage detection circuit, optocoupler, diode VD1 and diode VD2,
One end of the positive output over-voltage detection circuit is used to connect by the positive output road of protection circuit, the other end and the optocoupler
Positive pole connection,
One end of the negative output over-voltage detection circuit is used to connect by the negative output road of protection circuit, the other end and the optocoupler
Negative pole connection,
The plus earth of the diode VD1, the negative pole of the diode VD1 connects the positive pole of the optocoupler, the diode VD2
Negative pole ground connection, the positive pole of the diode VD2 connects the negative pole of the optocoupler.
2. multichannel overvoltage crowbar according to claim 1, it is characterised in that the positive output over-voltage detection circuit bag
Voltage-regulator diode VZ2 is included, the positive pole of the zener diode VZ2 is connected with the positive pole of the optocoupler, the zener diode VZ2
Negative pole be used for connect by the positive output road of protection circuit.
3. multichannel overvoltage crowbar according to claim 1 or 2, it is characterised in that the positive output overvoltage detection electricity
Resistance is in series with road.
4. multichannel overvoltage crowbar according to claim 1, it is characterised in that the negative output over-voltage detection circuit bag
Voltage-regulator diode VZ3 is included, the negative pole of the zener diode VZ3 is connected with the negative pole of the optocoupler, the zener diode VZ3
Positive pole be used for connect by the negative output road of protection circuit.
5. the multichannel overvoltage crowbar according to claim 1 or 4, it is characterised in that the negative output overvoltage detection electricity
Resistance is in series with road.
6. multichannel overvoltage crowbar according to claim 1, it is characterised in that the diode VD1 and two pole
Pipe VD2 is a bilateral diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089599.XU CN206442112U (en) | 2017-01-23 | 2017-01-23 | Multichannel overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720089599.XU CN206442112U (en) | 2017-01-23 | 2017-01-23 | Multichannel overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206442112U true CN206442112U (en) | 2017-08-25 |
Family
ID=59636326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720089599.XU Expired - Fee Related CN206442112U (en) | 2017-01-23 | 2017-01-23 | Multichannel overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206442112U (en) |
-
2017
- 2017-01-23 CN CN201720089599.XU patent/CN206442112U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170825 Termination date: 20210123 |