CN205945040U - Quick self -driven overvoltage crowbar - Google Patents
Quick self -driven overvoltage crowbar Download PDFInfo
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- CN205945040U CN205945040U CN201620717138.8U CN201620717138U CN205945040U CN 205945040 U CN205945040 U CN 205945040U CN 201620717138 U CN201620717138 U CN 201620717138U CN 205945040 U CN205945040 U CN 205945040U
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- resistance
- electric capacity
- driven
- overvoltage crowbar
- controllable silicon
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Abstract
The utility model discloses a quick self -driven overvoltage crowbar, it includes resistance R1, transient voltage suppression diode D1, electric capacity C1 and silicon controlled rectifier Q1, silicon controlled rectifier Q1's negative pole is connected with electric capacity C1's one end and output voltage negative terminal, and silicon controlled rectifier Q1's negative pole and output voltage anode anodal and transient voltage suppression diode D1 are connected, and silicon controlled rectifier Q1's control electrode is connected with electric capacity C1's the other end and resistance R1's one end, and resistance R1's the other end and the anodal of transient voltage suppression diode D1 are connected, this quick self -driven overvoltage crowbar does not carry out work at the normal during operation of output voltage, does not have power consumption, when detecting output during the excessive pressure, can the fast reaction, and guarantee that output voltage is by quick reliable shutoff.
Description
Technical field
This utility model is related to a kind of protection circuit and in particular to one kind quickly self-driven overvoltage crowbar.
Background technology
At present, output overvoltage protection circuit is mainly used in tandem tap type；However, to overvoltage protection of the prior art
For circuit, if switching as electrical switch, then certainly exist conducting resistance, excessive power attenuation can be led to, reduce
Overall efficiency, and it also requires additionally carrying out the thermal design of electrical switch, otherwise at high temperature under can lead to thermal breakdown lost efficacy；As
Fruit switchs as relay, can be limited to relay bulky, intolerant to conditions such as high vibration and HI high impacts, turn off the response time
Long, reliability low it is impossible to apply in airborne, missile-borne, the high reliability platform such as carrier-borne.
Utility model content
The purpose of this utility model is to provide one kind quickly self-driven overvoltage crowbar, to solve power mentioned above
More and reliability low problem is lost.
For solving above-mentioned technical problem, this utility model provides one kind quickly self-driven overvoltage crowbar, and it includes electricity
Resistance R1, transient voltage suppressor D1, electric capacity C1 and controllable silicon Q1；One end of the negative pole of controllable silicon Q1 and electric capacity C1 and output
Voltage negative terminal connects, and the positive pole of controllable silicon Q1 is connected with the negative pole of transient voltage suppressor D1 and output voltage anode, can
The control pole of control silicon Q1 is connected with the other end of electric capacity C1 and one end of resistance R1, and the other end of resistance R1 is suppressed with transient voltage
The positive pole of diode D1 connects.
Further, the inductance L1 for suppressing current break, the positive pole of one end of inductance L1 and controllable silicon Q1 are also included
Connect, the other end of inductance L1 is connected with the negative pole of transient voltage suppressor D1.
Further, also include the resistance R2 for providing discharge loop for electric capacity C1, resistance R2 is in parallel with electric capacity C1.
Further, transient voltage suppressor D1 suppresses diode for bipolarity time variant voltage.
Further, the resistance of resistance R1 is 80 ~ 120 ohm, and the resistance of resistance R2 is 9K ~ 11K ohm.
Further, the capacitance of electric capacity C1 is 0.8 nF ~ 1.2nF.
The beneficial effects of the utility model are：This quickly self-driven overvoltage crowbar in output voltage normal work,
It is not operated, do not have power consumption；When output overvoltage is detected, because of transient voltage suppressor D1 and controllable silicon Q1
Fast reaction characteristic is it is ensured that output voltage is by the shutoff of fast and reliable；Meanwhile, sealing in of inductance L1 can suppress electric current can not dash forward
Become, the setting of resistance R2, provide discharge loop for electric capacity C1, in the presence of resistance R2 and electric capacity C1, absorb transient electrical and constrain
The leakage current of diode D1 processed, prevents controllable silicon Q1 by false triggering.
Brief description
Fig. 1 is the circuit diagram of quickly self-driven overvoltage crowbar.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe it is clear that described embodiment is only a kind of embodiment of this utility model, rather than whole realities
Apply example.Based on the embodiment in this utility model, those of ordinary skill in the art institute under the premise of not making creative work
The every other embodiment obtaining, broadly falls into protection domain of the present utility model.
For the sake of simplicity, eliminate the technology general knowledge well known to this technical field technical staff in herein below.
As shown in figure 1, this quickly self-driven overvoltage crowbar include resistance R1, transient voltage suppressor D1, electricity
Hold C1 and controllable silicon Q1；Wherein, transient voltage suppressor D1 suppresses diode for bipolarity time variant voltage, and response speed is nS
Level；The negative pole of controllable silicon Q1 is connected with one end of electric capacity C1 and output voltage negative terminal, and the positive pole of controllable silicon Q1 is constrained with transient electrical
The negative pole of diode D1 processed and the connection of output voltage anode, the other end of the control pole of controllable silicon Q1 and electric capacity C1 and resistance R1's
One end connects, and the other end of resistance R1 is connected with the positive pole of transient voltage suppressor D1.
In being embodied as, the selection of transient voltage suppressor D1 signal depends on the big of output overvoltage setting value
Little；The selection of controllable silicon Q1 model depends on the load capacity of input power and the size of impact resistance electric current；The resistance of resistance R1
For 80 ~ 120 ohm, the resistance of resistance R2 is 9K ~ 11K ohm, and the capacitance of electric capacity is 0.8 nF ~ 1.2nF；In being embodied as,
Preferably the resistance of resistance R1 is 100 ohm, and the resistance of resistance R2 is 10K ohm, and the capacitance of electric capacity is 1nF, and inductance L1 is general
Select the inductance that inductance value is several uH.
When output voltage overvoltage, reach transient voltage suppressor D1 breakdown threshold voltage when, transient voltage suppress
Diode D1 is operated in breakdown conditions；Now, the voltage in transient voltage suppressor D1 is breakdown voltage rating, circuit
Over-voltage protection point to be determined by the breakdown voltage rating of transient voltage suppressor D1.
After transient voltage suppressor D1 punctures work, begin with electric current and flow through to resistance R1, and give electric capacity simultaneously
C1 charges, and charging interval of its electric capacity C1 is that the resistance of resistance R1 is multiplied by the capacitance of electric capacity C1；When electric capacity C1 voltage with controlled
When the activation threshold value voltage of silicon Q1 is identical, controllable silicon Q1 turns on, and output voltage anode and the short circuit of output voltage negative terminal, this
When, output voltage is dragged down close to zero volt by controllable silicon Q1, and causes the outside input power switch power supply being connected with this circuit
Overcurrent protection function, close output.
In being embodied as, from the characteristic of controllable silicon Q1, once controllable silicon Q1 is triggered, simply by the presence of output electricity
Pressure, controllable silicon Q1 will maintain conducting, be locked in output off state；When input is restarted, and overvoltage condition has eliminated, can
Control silicon Q1 will turn off, de-preservation state.
The circuit structure of this quick self-driven overvoltage crowbar is novel, simple, and the electronic component being used is less；And
Protection circuit during output voltage normal work, and do not work and there is no power consumption；When output overvoltage is detected, because transient electrical is constrained
, it is ensured that output voltage is by the shutoff of fast and reliable, reliability is high for the fast reaction characteristic of diode D1 processed and controllable silicon Q1.
Preferred embodiment of the present utility model is：Also include the inductance L1 for suppressing current break, one end of inductance L1
It is connected with the positive pole of controllable silicon Q1, the other end of inductance L1 is connected with the negative pole of transient voltage suppressor D1；Specifically real
Shi Zhong, controllable silicon Q1 opens in a flash, and the surge current that load capacitance electric discharge produces is possible to the maximum beyond controllable silicon Q1
Tolerance dash current, now, the inductance L1 sealing in can suppress electric current so as to can not be mutated.
Preferred embodiment of the present utility model is：Also include the resistance R2 for providing discharge loop for electric capacity C1, resistance
R2 is in parallel with electric capacity C1；In being embodied as, resistance R2 provides discharge loop for electric capacity C1, in the effect of resistance R2 and electric capacity C1
Under, absorb the leakage current of transient voltage suppressor D1, prevent controllable silicon Q1 by false triggering.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or new using this practicality
Type.Multiple modifications to these embodiments will make it will be apparent that defined herein for those skilled in the art
General Principle can realize in other embodiments in the case of the spirit or scope without departing from utility model.Therefore, originally
Utility model will not be limited and the embodiments shown herein, and is to fit to and principles disclosed herein and novelty
The property consistent scope the widest of feature.
Claims (6)
1. one kind quickly self-driven overvoltage crowbar it is characterised in that：Including resistance R1, transient voltage suppressor D1,
Electric capacity C1 and controllable silicon Q1；The negative pole of described controllable silicon Q1 is connected with one end of described electric capacity C1 and output voltage negative terminal, controlled
The positive pole of silicon Q1 is connected with the negative pole of described transient voltage suppressor D1 and output voltage anode, the control pole of controllable silicon Q1
It is connected with the other end of described electric capacity C1 and one end of resistance R1, the other end of described resistance R1 suppresses two with described transient voltage
The positive pole of pole pipe D1 connects.
2. quickly self-driven overvoltage crowbar according to claim 1 it is characterised in that：Also include for suppressing electric current
The inductance L1 of mutation, one end of described inductance L1 is connected with the positive pole of described controllable silicon Q1, the other end of inductance L1 and described wink
Time variant voltage suppresses the negative pole of diode D1 to connect.
3. quickly self-driven overvoltage crowbar according to claim 1 and 2 it is characterised in that：Also include for for electricity
Holding C1 provides the resistance R2 of discharge loop, and described resistance R2 is in parallel with described electric capacity C1.
4. quickly self-driven overvoltage crowbar according to claim 3 it is characterised in that：Described transient voltage suppression two
Pole pipe D1 suppresses diode for bipolarity time variant voltage.
5. quickly self-driven overvoltage crowbar according to claim 4 it is characterised in that：The resistance of described resistance R1 is
80 ~ 120 ohm, the resistance of described resistance R2 is 9K ~ 11K ohm.
6. quickly self-driven overvoltage crowbar according to claim 5 it is characterised in that：The capacitance of described electric capacity C1 is
0.8 nF ~1.2nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620717138.8U CN205945040U (en) | 2016-07-08 | 2016-07-08 | Quick self -driven overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620717138.8U CN205945040U (en) | 2016-07-08 | 2016-07-08 | Quick self -driven overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945040U true CN205945040U (en) | 2017-02-08 |
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ID=57927912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620717138.8U Active CN205945040U (en) | 2016-07-08 | 2016-07-08 | Quick self -driven overvoltage crowbar |
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| Country | Link |
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| CN (1) | CN205945040U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670065A (en) * | 2020-12-28 | 2021-04-16 | 科华恒盛股份有限公司 | Anti-peak circuit and compensation transformer |
-
2016
- 2016-07-08 CN CN201620717138.8U patent/CN205945040U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670065A (en) * | 2020-12-28 | 2021-04-16 | 科华恒盛股份有限公司 | Anti-peak circuit and compensation transformer |
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| GR01 | Patent grant |