CN205647251U - Novel overvoltage crowbar - Google Patents
Novel overvoltage crowbar Download PDFInfo
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- CN205647251U CN205647251U CN201620315024.0U CN201620315024U CN205647251U CN 205647251 U CN205647251 U CN 205647251U CN 201620315024 U CN201620315024 U CN 201620315024U CN 205647251 U CN205647251 U CN 205647251U
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Abstract
The utility model discloses a novel overvoltage crowbar, include switching power supply and the input power that is connected with switching power supply, be equipped with overvoltage crowbar between switching power supply and input power, overvoltage crowbar includes comparator, triode, first resistance, second resistance, third resistance, fourth resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, a zener diode, the 2nd zener diode and energy -storage capacitor. The utility model has the advantages of simple structure, the simple operation can effectually realize overvoltage protection to burn out the not enough of switching power supply component easily when can effectual solution conventional art medium voltage too high, the stability in use is good, and the suitability is strong and the practicality is good.
Description
Technical field
This utility model relates to switch power technology field, particularly to a kind of overvoltage type protection circuit.
Background technology
Along with the application of Switching Power Supply is more and more extensive, environment is used also to become increasingly complex, some local voltage pulsations especially are greatly the problems faced by a lot of Switching Power Supply needs, the related elements of Switching Power Supply is easily burnt out during overtension, the pressure parameter of unconfined raising related elements is also unrealistic, this can cause product cost high, is unfavorable for development and the application of Switching Power Supply.
Utility model content
Main purpose of the present utility model is to provide a kind of overvoltage type protection circuit, it is intended to solve easily to burn out during overtension in conventional art the deficiency of Switching Power Supply element.
nullThe utility model proposes a kind of overvoltage type protection circuit，Including Switching Power Supply and the input power that is connected with described Switching Power Supply，It is provided with overvoltage crowbar between described Switching Power Supply and described input power，Described overvoltage crowbar includes comparator、Audion、First resistance、Second resistance、3rd resistance、4th resistance、5th resistance、6th resistance、7th resistance、8th resistance、First Zener diode、Second Zener diode and storage capacitor，The power input of described comparator by the 6th resistance be connected to input power positive pole and after the power input of described comparator is by the second Zener diode and storage capacitor Electricity Federation circuit ground connection，The outfan of described comparator is connected with the base stage of audion by the 7th resistance，The colelctor electrode of described audion is connected with the negative pole of described Switching Power Supply，The grounded emitter of described audion，The base stage of described audion passes through the 8th resistance eutral grounding，Second pin of comparator is connected on the positive pole of input power by the first resistance and the second resistance series circuit and the second pin of described comparator passes through the first Zener diode ground connection，3rd pin of described comparator is connected on the positive pole of input power by the 3rd resistance and the 4th resistance series circuit and the 3rd pin of described comparator passes through the 5th resistance eutral grounding.
Described audion for NPN type triode.
The model of described comparator is LM358.
Simple in construction of the present utility model, simple operation, overvoltage protection can be effectively realized, thus the deficiency of Switching Power Supply element can be effectively solved easily to burn out during overtension in conventional art, stability in use is good, and the suitability is strong and practicality good.
Accompanying drawing explanation
Fig. 1 is embodiment schematic diagram of the present utility model.
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
nullWith reference to Fig. 1，An embodiment of the present utility model is proposed，A kind of overvoltage type protection circuit，Including Switching Power Supply 1 and the input power 2 that is connected with described Switching Power Supply 1，It is provided with overvoltage crowbar 3 between described Switching Power Supply 1 and described input power 2，Described overvoltage crowbar 3 includes comparator U1A、Audion Q1、First resistance R1、Second resistance R2、3rd resistance R3、4th resistance R4、5th resistance R5、6th resistance R6、7th resistance R7、8th resistance R8、First Zener diode Z1、Second Zener diode Z2 and storage capacitor C，The power input of described comparator U1A by the 6th resistance R6 be connected to input power 2 positive pole and after the power input of described comparator U1A is by the second Zener diode Z2 and storage capacitor C Electricity Federation circuit ground connection，The outfan of described comparator U1A is connected by the base stage of the 7th resistance R7 and audion Q1，The colelctor electrode of described audion Q1 is connected with the negative pole of described Switching Power Supply 1，The grounded emitter of described audion Q1，The base stage of described audion Q1 hinders ground connection by the 8th electricity R8，Second pin of comparator U1A is connected on the positive pole of input power 2 by the first resistance R1 and the second resistance R2 series circuit and second pin of described comparator U1A passes through the first voltage stabilizing two pole Z1 pipe ground connection，3rd pin of described comparator U1A is connected on the positive pole of input power 2 by the 3rd resistance R3 and the 4th resistance R4 series circuit and the 3rd pin of described comparator U1A passes through the 5th resistance R5 ground connection.
Described audion for NPN type triode.
The model of described comparator is LM358.
Its operation principle is summarized as follows: when power input VCC is operated in normal voltage range, Switching Power Supply normally works, there is provided running voltage to comparator U1A by resistance R6 and Zener diode Z2, by resistance R1, R2 and Zener diode Z1 provides reference voltage to detect to comparator 2 foot, comparator 3 foot passes through resistance R3, R4, R5 detection VCC both end voltage change.
Power input VCC is in the voltage range set, the height of voltage ratio 3 foot of comparator 2 foot, comparator output low level, audion Q1 ends, audion Q1 meets switching power source chip VDD or enable foot EN. now the two foot position is all high level, and Switching Power Supply normally works.
Power input VCC exceeds the voltage range set, and enters overvoltage protection mode, the height of voltage ratio 2 foot of comparator 3 foot, comparator output high level, and audion Q1 turns on, and switching power source chip VDD or enable foot EN becomes low level, and Switching Power Supply quits work.
Simple in construction of the present utility model, simple operation, overvoltage protection can be effectively realized, thus the deficiency of Switching Power Supply element can be effectively solved easily to burn out during overtension in conventional art, stability in use is good, and the suitability is strong and practicality good.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing this utility model description and accompanying drawing content to be made; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in scope of patent protection of the present utility model.
Claims (3)
- null1. an overvoltage type protection circuit，Including Switching Power Supply and the input power that is connected with described Switching Power Supply，It is characterized in that: between described Switching Power Supply and described input power, be provided with overvoltage crowbar，Described overvoltage crowbar includes comparator、Audion、First resistance、Second resistance、3rd resistance、4th resistance、5th resistance、6th resistance、7th resistance、8th resistance、First Zener diode、Second Zener diode and storage capacitor，The power input of described comparator by the 6th resistance be connected to input power positive pole and after the power input of described comparator is by the second Zener diode and storage capacitor Electricity Federation circuit ground connection，The outfan of described comparator is connected with the base stage of audion by the 7th resistance，The colelctor electrode of described audion is connected with the negative pole of described Switching Power Supply，The grounded emitter of described audion，The base stage of described audion passes through the 8th resistance eutral grounding，Second pin of comparator is connected on the positive pole of input power by the first resistance and the second resistance series circuit and the second pin of described comparator passes through the first Zener diode ground connection，3rd pin of described comparator is connected on the positive pole of input power by the 3rd resistance and the 4th resistance series circuit and the 3rd pin of described comparator passes through the 5th resistance eutral grounding.
- Overvoltage type protection circuit the most according to claim 1, it is characterised in that: described audion for NPN type triode.
- Overvoltage type protection circuit the most according to claim 2, it is characterised in that: the model of described comparator is LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620315024.0U CN205647251U (en) | 2016-04-15 | 2016-04-15 | Novel overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620315024.0U CN205647251U (en) | 2016-04-15 | 2016-04-15 | Novel overvoltage crowbar |
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| Publication Number | Publication Date |
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| CN205647251U true CN205647251U (en) | 2016-10-12 |
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| CN201620315024.0U Active CN205647251U (en) | 2016-04-15 | 2016-04-15 | Novel overvoltage crowbar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155634A (en) * | 2016-12-05 | 2018-06-12 | 意法半导体股份有限公司 | Current limiter, corresponding intrument and method |
| CN108322028A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit and its control method |
| CN108322027A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit |
| CN110601517A (en) * | 2019-08-30 | 2019-12-20 | 苏州浪潮智能科技有限公司 | MLCC filtering module based on PSU voltage output |
-
2016
- 2016-04-15 CN CN201620315024.0U patent/CN205647251U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155634A (en) * | 2016-12-05 | 2018-06-12 | 意法半导体股份有限公司 | Current limiter, corresponding intrument and method |
| CN108155634B (en) * | 2016-12-05 | 2019-12-13 | 意法半导体股份有限公司 | Current limiter, corresponding device and method |
| CN108322028A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit and its control method |
| CN108322027A (en) * | 2017-01-18 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of power conversion circuit |
| CN110601517A (en) * | 2019-08-30 | 2019-12-20 | 苏州浪潮智能科技有限公司 | MLCC filtering module based on PSU voltage output |
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| C14 | Grant of patent or utility model | ||
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