CN102882181B - Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor - Google Patents
Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor Download PDFInfo
- Publication number
- CN102882181B CN102882181B CN201210379400.9A CN201210379400A CN102882181B CN 102882181 B CN102882181 B CN 102882181B CN 201210379400 A CN201210379400 A CN 201210379400A CN 102882181 B CN102882181 B CN 102882181B
- Authority
- CN
- China
- Prior art keywords
- voltage
- fuse
- resistance
- triode thyristor
- bidirectional triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a reverse protection and overvoltage protection circuit based on a bidirectional silicon-controlled thyristor. The circuit comprises a fuse, the bidirectional silicon-controlled thyristor and a voltage-regulator tube. A first end of the fuse is a power end, a second end of the fuse is a power supply output end, the second end of the fuse is connected to a negative electrode of the voltage-regulator tube through a first resistance, a positive electrode of the voltage-regulator tube is grounded through a second resistance, the second end of the fuse is further connected with a first electrode of the bidirectional silicon-controlled thyristor, a second electrode thereof is grounded, and a control electrode thereof is connected onto the positive electrode of the voltage-regulator tube. The reverse protection and overvoltage protection circuit based on the bidirectional silicon-controlled thyristor avoids circuit undervoltage, and product cost is lowered.
Description
Technical field
The present invention relates to driving power field, particularly relate to a kind of reverse connecting protection based on bidirectional triode thyristor and overvoltage crowbar.
Background technology
Along with the progress of science and technology and the development of society, increasing electronic product comes into daily life.Particularly along with the kind of small household electrical appliance and the increase of quantity, power supply adaptor industry is risen gradually, and in practical application, the problem that the phenomenons such as power supply overcurrent, reversal connection, overvoltage cause electronic product to damage also highlights day by day.So people, when design electronic products, are obliged to go to design some protective circuits and occur to prevent the situation of over-voltage and over-current and reversal connection.
Wherein, overcurrent refers to that electric current is excessive, exceedes the situation of the rated current of circuit.Mainly prevent the method for overcurrent from being add fuse on circuit now, fuse has specified electric current, when the rated current of circuital current over insurance silk, fuse can fuse, and forms open circuit, thus the electronic devices and components in protective circuit.
Reversal connection refers to that power supply adaptor both positive and negative polarity connects anti-situation, generally prevent the way of reversal connection from being add diode in circuit, utilize the characteristic of the unilateal conduction of diode and suppress flowing through of reverse current, but when adopting in this way, diode has the loss of pressure drop, this loss can increase along with the increase of electric current, in the circuit that electric current is larger, likely circuit can be caused to be in under-voltage situation because pressure drop is too large.
Overvoltage refers to that input voltage exceedes the situation of nominal input voltage, often adopts overvoltage protection chip and stablize surge voltage in prior art, when voltage input continues too high; circuit can be disconnected to protect electronic component; but the price of overvoltage protection chip is higher, adds entreprise cost.
Therefore, there is the defect that circuit is under-voltage and cost is higher in existing reverse connecting protection and overvoltage crowbar.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of reverse connecting protection based on bidirectional triode thyristor and overvoltage crowbar, thus avoid circuit under-voltage and reduce product cost.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
A kind of reverse connecting protection based on bidirectional triode thyristor and overvoltage crowbar; it includes: fuse, bidirectional triode thyristor and voltage-stabiliser tube; the first end of described fuse is power end; its second end is power supply output; this second end is also connected to the negative electrode of voltage-stabiliser tube by the first resistance; the anode of this voltage-stabiliser tube is by the second grounding through resistance; second end of described fuse also connects the first pole of bidirectional triode thyristor; second pole ground connection of described bidirectional triode thyristor, it controls the anode that pole is connected to voltage-stabiliser tube.
Preferably, described fuse is self-recoverage type fuse.
Preferably, the clamp voltage of described voltage-stabiliser tube is 12V.
Preferably, described first resistance is equal with the resistance value of the second resistance.
Preferably, described power end is also by the first capacity earth.
Preferably, described second resistance is also parallel with the second electric capacity.
In a kind of reverse connecting protection based on bidirectional triode thyristor disclosed by the invention and overvoltage crowbar, when circuit overcurrent, fuse blows is off state to make circuit.When power end and ground reversal connection; control pole and second pole of bidirectional thyristor are high potential; bidirectional thyristor conducting; fuse fuses because of short circuit; thus achieve power end and protection during ground reversal connection; this guard method, adopts diode to suppress the protected mode of reverse current, avoids the circuit caused because of the pressure drop loss of diode under-voltage compared to existing technology.When the input voltage of power end is too high; voltage-stabiliser tube reverse breakdown, and the dividing potential drop effect passing through the first resistance and the second resistance, make the second resistance produce voltage; when this voltage reaches the trigger voltage of bidirectional triode thyristor; bidirectional triode thyristor is because of conducting by power end and ground short circuit, and now, fuse fuses because electric current is excessive; thus achieve overvoltage protection; this guard method, adopts the protected mode of overvoltage protection chip, reduces product cost compared to existing technology.Therefore, invention not only avoids that circuit is under-voltage also reduces product cost.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with drawings and Examples, more detailed explanation is done to the present invention.
The present invention discloses a kind of reverse connecting protection based on bidirectional triode thyristor and overvoltage crowbar, as shown in Figure 1, it includes: fuse FU1, bidirectional triode thyristor Q1 and voltage-stabiliser tube D1, the first end of described fuse FU1 is power end VIN, its second end is power supply output VCC, this second end is also connected to the negative electrode of voltage-stabiliser tube D1 by the first resistance R1, the anode of this voltage-stabiliser tube D1 is by the second resistance R2 ground connection, second end of described fuse FU1 also connects first pole of bidirectional triode thyristor Q1, the second pole ground connection of described bidirectional triode thyristor Q1, it controls the anode that pole is connected to voltage-stabiliser tube D1.
In foregoing circuit structure, the output current of power supply adaptor and voltage pass through power supply output VCC and are that electronic product is powered after the present invention's protection.In the present invention, when circuit overcurrent, fuse FU1 fuses to make circuit be off state.When power end VIN and ground reversal connection; control pole and second pole of bidirectional thyristor Q1 are high potential; bidirectional thyristor Q1 conducting; fuse FU1 fuses because of short circuit; thus achieve power end VIN and protection during ground reversal connection; this guard method, adopts diode to suppress the protected mode of reverse current, avoids the circuit caused because of the pressure drop loss of diode under-voltage compared to existing technology.When the input voltage of power end VIN is too high; voltage-stabiliser tube D1 reverse breakdown; and pass through the dividing potential drop effect of the first resistance R1 and the second resistance R2; the second resistance R2 is made to produce voltage; when this voltage reaches the trigger voltage of bidirectional triode thyristor Q1; bidirectional triode thyristor Q1 because of conducting by power end VIN and ground short circuit; now; fuse FU1 fuses because electric current is excessive; thus achieve overvoltage protection; this guard method, adopts the protected mode of overvoltage protection chip, reduces product cost compared to existing technology.Therefore, invention not only avoids that circuit is under-voltage also reduces product cost.
In the present embodiment, as shown in Figure 1, fuse FU1 is self-recoverage type fuse, so, during embody rule, need not repeatedly change fuse FU1.The clamp voltage of voltage-stabiliser tube D1 is 12V, and the first resistance R1 is equal with the resistance value of the second resistance R2.If the input voltage of power end VIN is VI; the then pressure drop VR2=(VI-12V of the second resistance R2) * R2/(R1+R2); because the first resistance R1 is equal with the resistance of the second resistance R2; so VR2=(VI-12V)/2; in the present embodiment, when input voltage is higher than 15V, then VR2 makes bidirectional triode thyristor Q1 conducting higher than 1.5V; therefore, the present embodiment can realize when the input voltage of power end VIN is higher than overvoltage protection during 15V.But in other embodiments of the invention, the clamp voltage of voltage-stabiliser tube D1 can also be other numerical value, and the resistance value of the first resistance R1 and the second resistance R2 also can be unequal, and wherein the resistance of the first resistance R1 can be zero ohm also can be other numerical value.
As shown in Figure 1, power end VIN is also by the first electric capacity C1 ground connection, and the second resistance R2 is also parallel with the second electric capacity C2.Wherein, the first electric capacity C1 and the second electric capacity C2 is used for filtering high frequency spurs to avoid error starting of the present invention.
A kind of reverse connecting protection based on bidirectional triode thyristor disclosed by the invention and overvoltage crowbar, adopt diode to suppress the protected mode of reverse current, avoid the circuit caused because of the pressure drop loss of diode under-voltage compared to existing technology.Meanwhile, compare the protected mode of existing employing overvoltage protection chip, also reduce the cost of product.
The above is preferred embodiment of the present invention, is not limited to the present invention, all make in technical scope of the present invention amendment, equivalent to replace or improvement etc., all should be included in scope that the present invention protects.
Claims (2)
1. the reverse connecting protection based on bidirectional triode thyristor and overvoltage crowbar, it is characterized in that, it includes: fuse (FU1), bidirectional triode thyristor (Q1) and voltage-stabiliser tube (D1), the first end of described fuse (FU1) is power end (VIN), its second end is power supply output (VCC), this second end is also connected to the negative electrode of voltage-stabiliser tube (D1) by the first resistance (R1), the anode of this voltage-stabiliser tube (D1) is by the second resistance (R2) ground connection, second end of described fuse (FU1) also connects the first pole of bidirectional triode thyristor (Q1), second pole ground connection of described bidirectional triode thyristor (Q1), it controls the anode that pole is connected to voltage-stabiliser tube (D1), the clamp voltage of described voltage-stabiliser tube (D1) is 12V, described first resistance (R1) is equal with the resistance value of the second resistance (R2), described power end (VIN) is also by the first electric capacity (C1) ground connection, described second resistance (R2) is also parallel with the second electric capacity (C2).
2., as claimed in claim 1 based on reverse connecting protection and the overvoltage crowbar of bidirectional triode thyristor, it is characterized in that, described fuse (FU1) is self-recoverage type fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379400.9A CN102882181B (en) | 2012-09-29 | 2012-09-29 | Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379400.9A CN102882181B (en) | 2012-09-29 | 2012-09-29 | Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102882181A CN102882181A (en) | 2013-01-16 |
| CN102882181B true CN102882181B (en) | 2015-02-25 |
Family
ID=47483408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210379400.9A Active CN102882181B (en) | 2012-09-29 | 2012-09-29 | Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102882181B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644138A (en) * | 2016-11-08 | 2017-05-10 | 四川瑞霆电力科技有限公司 | Circuit breaker moving contact passive wireless acquisition device and temperature measurement monitoring system |
| CN206272219U (en) * | 2016-11-18 | 2017-06-20 | 深圳创维数字技术有限公司 | A kind of overvoltage and reverse-connection protection circuit and its equipment |
| CN106786464B (en) * | 2017-01-12 | 2020-09-11 | 徐向宇 | Active protection type sensor isolation protection circuit |
| CN117081375A (en) * | 2023-08-21 | 2023-11-17 | 徐州宏远通信科技有限公司 | Intrinsically safe infrared thermal imaging camera power supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0427635A1 (en) * | 1989-11-09 | 1991-05-15 | Legrand | Power control device, in particular dimmer, with protection against short-circuit and overload |
| CN201061120Y (en) * | 2007-06-21 | 2008-05-14 | 陈丙美 | Duplicate power supply protector of large-scale medical detection apparatus |
| CN101459332A (en) * | 2008-12-12 | 2009-06-17 | 中通客车控股股份有限公司 | Overvoltage protection device for automobile electric control unit |
| CN101459331A (en) * | 2007-12-14 | 2009-06-17 | 英业达股份有限公司 | Over voltage protection device, DC to DC voltage convertor and over voltage protection method |
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
| CN202856306U (en) * | 2012-09-29 | 2013-04-03 | 深圳市新国都技术股份有限公司 | Reverse connection protection and overvoltage protection circuit based on bidirectional silicon controlled rectifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100465107B1 (en) * | 1997-05-22 | 2005-04-06 | 삼성전자주식회사 | Overvoltage Protection Circuit |
-
2012
- 2012-09-29 CN CN201210379400.9A patent/CN102882181B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0427635A1 (en) * | 1989-11-09 | 1991-05-15 | Legrand | Power control device, in particular dimmer, with protection against short-circuit and overload |
| CN201061120Y (en) * | 2007-06-21 | 2008-05-14 | 陈丙美 | Duplicate power supply protector of large-scale medical detection apparatus |
| CN101459331A (en) * | 2007-12-14 | 2009-06-17 | 英业达股份有限公司 | Over voltage protection device, DC to DC voltage convertor and over voltage protection method |
| CN101459332A (en) * | 2008-12-12 | 2009-06-17 | 中通客车控股股份有限公司 | Overvoltage protection device for automobile electric control unit |
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
| CN202856306U (en) * | 2012-09-29 | 2013-04-03 | 深圳市新国都技术股份有限公司 | Reverse connection protection and overvoltage protection circuit based on bidirectional silicon controlled rectifier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102882181A (en) | 2013-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI355126B (en) | Protect circuit of car power | |
| CN104269835A (en) | Protection device, electronic equipment and power supply | |
| WO2017097002A1 (en) | Anti-surge switching power supply and anti-surge circuit | |
| CN101242090A (en) | Over-voltage protector | |
| CN201797293U (en) | Anti-surge protection circuit for aviation direct current power supply | |
| CN102882181B (en) | Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor | |
| CN105633905A (en) | Overvoltage and under-voltage protection circuit | |
| CN102022702A (en) | Protective circuit of luminescence module, light emitting diode wafer and alternating current light emitting diode | |
| CN202856306U (en) | Reverse connection protection and overvoltage protection circuit based on bidirectional silicon controlled rectifier | |
| CN109103865A (en) | A kind of power supply overvoltage protection circuit of high pressure barricade | |
| CN104080221B (en) | A kind of LED drive circuit and LED light | |
| CN203618196U (en) | Anti-surge circuit and integrated circuit comprising same | |
| CN105810163B (en) | Boost DC-direct current transducer | |
| CN108134381A (en) | Overvoltage crowbar, method and electronic equipment | |
| CN208904649U (en) | A kind of power supply overvoltage protection circuit of high pressure barricade | |
| CN204030571U (en) | The AC and DC power supply lightning protection device of the wide-voltage range of the large low residual voltage of discharge capacity | |
| CN203352131U (en) | Port with over-current protection and surge prevention functions | |
| CN103701100A (en) | Switching power supply and over-voltage protection circuit thereof | |
| CN204191002U (en) | Can the LED drive circuit of anti-2KV surge voltage | |
| CN114400907A (en) | Radiation-resistant three-phase diode series dual-protection rectifying circuit | |
| CN202977969U (en) | Efficient protection circuit of laser coupling power source | |
| CN208423760U (en) | The vehicle-mounted anti-short circuit current of USB | |
| CN203218857U (en) | Overvoltage protection circuit | |
| CN103595233A (en) | Input protection circuit | |
| CN110474290A (en) | A kind of protection circuit against input over-voltage that brief and practical can restore automatically |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |