CN201674212U - Overvoltage protection circuit of a switch power supply and its corresponding switch power supply - Google Patents
Overvoltage protection circuit of a switch power supply and its corresponding switch power supply Download PDFInfo
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- CN201674212U CN201674212U CN2010201845040U CN201020184504U CN201674212U CN 201674212 U CN201674212 U CN 201674212U CN 2010201845040 U CN2010201845040 U CN 2010201845040U CN 201020184504 U CN201020184504 U CN 201020184504U CN 201674212 U CN201674212 U CN 201674212U
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Abstract
The utility model is suitable for a power supply technical field and provides an overvoltage protection circuit of a switch power supply and its corresponding switch power supply. By using the overvoltage protection circuit, the power supply is automatically cut off when the voltage is over high, thereby effectively protecting the switch power supply and when the voltage recovers to be normal, the switch power supply is automatically at the normal state. The use of the switch power supply is not affected and the safety and life time of the power supply are ensured. The structure of the overvoltage protection circuit is simple and the cost is relative low compared with the prior technology using the high-stress element.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of overvoltage crowbar and respective switch power supply of Switching Power Supply.
Background technology
At present, power supply product is sold to all parts of the world, and global voltage range is substantially all between 100-240Vac, and in India market, voltage of power changes (160Vac-320Vac) greatly.Because what Switching Power Supply was generally done all is the 90-264Vac scope, when voltage exceeds 264Vac, often burns various appliances power source devices easily.Therefore, at India market, common product all is to adopt to improve relevant components and parts stress, but so, the Switching Power Supply difficulty that designs global voltage range obviously strengthens, make general power supply under the situation of line voltage unusual (more than the 280Vac), be in a kind of bad operating state, though used heavily stressed components and parts, the probability of short-term generation power-fail reduces, but electric power system such as long period unusual (being higher than normal voltage), can there be the hidden danger of inefficacy in power supply, and product also will obviously reduce useful life, simultaneously, because of adopting heavily stressed components and parts, cost has also had bigger increase, is unfavorable for the popularization in market.
The utility model content
The purpose of the utility model embodiment is to provide a kind of overvoltage crowbar of Switching Power Supply; be intended to solve the existing Switching Power Supply long period when being higher than normal voltage; can there be the hidden danger of inefficacy in power supply, and product also will obviously reduce useful life, and the cost problem of higher.
The utility model embodiment realizes like this; a kind of overvoltage crowbar of Switching Power Supply; described overvoltage crowbar comprises the AC rectifier bridge that links to each other with the civil power output; the anode output of described AC rectifier bridge links to each other with pressurizer U1 by voltage detecting resistance R 1; the output of described pressurizer U1 is connected in comparator U2 in-phase end; and; described AC rectifier bridge anode output is by voltage detecting resistance R 2; the R3 dividing potential drop; be connected in comparator U2 end of oppisite phase through filter capacitor C1; described comparator U2 output connects NPN triode Q3 base stage; NPN triode Q3 collector electrode connects PNP triode Q4 base stage; be Q3; Q4 provides the resistance R 5 of bias current to be connected between VCC and the Q4 base stage; described PNP triode Q4 links to each other with the input of PWM controller; the output of described PWM controller is connected to metal-oxide-semiconductor Q1 grid, and described metal-oxide-semiconductor Q1 drain electrode is connected with the elementary winding of power transformer T1.
Another purpose of the utility model embodiment is to provide a kind of Switching Power Supply; described Switching Power Supply comprises overvoltage crowbar; described overvoltage crowbar comprises the AC rectifier bridge that links to each other with the civil power output; the anode output of described AC rectifier bridge links to each other with pressurizer U1 by voltage detecting resistance R 1; the output of described pressurizer U1 is connected in comparator U2 in-phase end; and; described AC rectifier bridge anode output is by voltage detecting resistance R 2; the R3 dividing potential drop; be connected in comparator U2 end of oppisite phase through filter capacitor C1; described comparator U2 output connects NPN triode Q3 base stage; NPN triode Q3 collector electrode connects PNP triode Q4 base stage; be Q3; Q4 provides the resistance R 5 of bias current to be connected between VCC and the Q4 base stage; described PNP triode Q4 links to each other with the input of PWM controller; the output of described PWM controller is connected to metal-oxide-semiconductor Q1 grid, and described metal-oxide-semiconductor Q1 drain electrode is connected with the elementary winding of power transformer T1.
In the utility model, adopt overvoltage crowbar can when overtension, cut off Switching Power Supply work automatically, thereby effective protection switch power supply after recovering normally, voltage can enter normal condition automatically.Like this, not only do not influence the use of Switching Power Supply, and guaranteed the fail safe and the life-span of Switching Power Supply.And this overvoltage crowbar is simple in structure, compares the heavily stressed element that in the past adopted, and cost is also lower.
Description of drawings
Fig. 1 is the structural representation of the overvoltage crowbar of the Switching Power Supply that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the structure of the overvoltage crowbar of the Switching Power Supply that the utility model embodiment provides, and this overvoltage crowbar can be the hardware circuit unit of Switching Power Supply inside.This Switching Power Supply can be used as the power supply unit of electrical equipment.
This overvoltage crowbar comprises the AC rectifier bridge that links to each other with the civil power output; the anode output of described AC rectifier bridge links to each other with pressurizer U1 by voltage detecting resistance R 1; the output of described pressurizer U1 is connected in comparator U2 in-phase end; and; described AC rectifier bridge anode output is by voltage detecting resistance R 2; the R3 dividing potential drop; be connected in comparator U2 end of oppisite phase through filter capacitor C1; described comparator U2 output connects NPN triode Q3 base stage; NPN triode Q3 collector electrode connects PNP triode Q4 base stage; be Q3; Q4 provides the resistance R 5 of bias current to be connected between VCC and the Q4 base stage; described PNP triode Q4 links to each other with the input of PWM controller, and the output of described PWM controller is connected to the described metal-oxide-semiconductor Q1 drain electrode of metal-oxide-semiconductor Q1 grid and is connected with the elementary winding of power transformer T1.
Exchange the input civil power after the rectifier bridge rectification, anode output gives pressurizer U1 power supply (in order to reach good result by R1, U1 can adopt accurate pressurizer), pressurizer U1 produces a high-precision fixed voltage source, reference voltage is provided for comparator U2 in-phase end, the arrangement output plus terminal is by voltage detecting resistance R 2R3 dividing potential drop, after C1 filtering, be connected to comparator U2 end of oppisite phase, civil power just often, comparator U2 end of oppisite phase voltage is lower than in-phase end voltage, comparator U2 is output as high level, NPN triode Q3 conducting, PNP triode Q4 conducting, VCC gives the power supply of PWM control section by PNP triode Q4, PWM control section operate as normal output control square wave, metal-oxide-semiconductor Q1, transformer T1 operate as normal provides voltage for the back level.
When interchange input city electrical anomaly is too high; voltage height behind the arrangement bridge; by voltage detecting resistance R 2, R3 voltage after partial height, when comparator U2 end of oppisite phase voltage was higher than in-phase voltage, comparator U2 output switching activity was a low level; NPN triode Q3 ends; PNP triode Q4 ends, and cuts off the power supply of PWM control section, and circuit is quit work; thereby protection back level components and parts and supply unit can not burn because of the unstable overtension of electric power system.
This circuit uses comparator and high-precision reference voltage source; frame is surveyed the civil power variation very accurately; when civil power surpasses when voltage is set; can power by the very fast correct device of cutting off the electricity supply; the protection relevant device, and in the city power recovery just often, comparator output converts high level to; power up work, thus realized the Intelligent Measurement conversion.
In sum, adopt overvoltage crowbar can when overtension, cut off Switching Power Supply work automatically, thereby effective protection switch power supply after recovering normally, voltage can enter normal condition automatically.Like this, not only do not influence the use of Switching Power Supply, and guaranteed the fail safe and the life-span of Switching Power Supply.And this overvoltage crowbar is simple in structure, compares the heavily stressed element that in the past adopted, and cost is also lower.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (2)
1. the overvoltage crowbar of a Switching Power Supply; it is characterized in that; described overvoltage crowbar comprises the AC rectifier bridge that links to each other with the civil power output; the anode output of described AC rectifier bridge links to each other with pressurizer U1 by voltage detecting resistance R 1; the output of described pressurizer U1 is connected in comparator U2 in-phase end; and; described AC rectifier bridge anode output is by voltage detecting resistance R 2; the R3 dividing potential drop; be connected in comparator U2 end of oppisite phase through filter capacitor C1; described comparator U2 output connects NPN triode Q3 base stage; NPN triode Q3 collector electrode connects PNP triode Q4 base stage; be Q3; Q4 provides the resistance R 5 of bias current to be connected between VCC and the Q4 base stage; described PNP triode Q4 links to each other with the input of PWM controller; the output of described PWM controller is connected to metal-oxide-semiconductor Q1 grid, and described metal-oxide-semiconductor Q1 drain electrode is connected with the elementary winding of power transformer T1.
2. Switching Power Supply; it is characterized in that; described Switching Power Supply comprises overvoltage crowbar; described overvoltage crowbar comprises the AC rectifier bridge that links to each other with the civil power output; the anode output of described AC rectifier bridge links to each other with pressurizer U1 by voltage detecting resistance R 1; the output of described pressurizer U1 is connected in comparator U2 in-phase end; and; described AC rectifier bridge anode output is by voltage detecting resistance R 2; the R3 dividing potential drop; be connected in comparator U2 end of oppisite phase through filter capacitor C1; described comparator U2 output connects NPN triode Q3 base stage; NPN triode Q3 collector electrode connects PNP triode Q4 base stage; be Q3; Q4 provides the resistance R 5 of bias current to be connected between VCC and the Q4 base stage; described PNP triode Q4 links to each other with the input of PWM controller; the output of described PWM controller is connected to metal-oxide-semiconductor Q1 grid, and described metal-oxide-semiconductor Q1 drain electrode is connected with the elementary winding of power transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201845040U CN201674212U (en) | 2010-04-30 | 2010-04-30 | Overvoltage protection circuit of a switch power supply and its corresponding switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201845040U CN201674212U (en) | 2010-04-30 | 2010-04-30 | Overvoltage protection circuit of a switch power supply and its corresponding switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674212U true CN201674212U (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201845040U Expired - Lifetime CN201674212U (en) | 2010-04-30 | 2010-04-30 | Overvoltage protection circuit of a switch power supply and its corresponding switch power supply |
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| Country | Link |
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| CN (1) | CN201674212U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651544A (en) * | 2012-03-27 | 2012-08-29 | 深圳市朗科电器有限公司 | Over-voltage protection method for field-effect transistor |
| CN102737585A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Method for reducing backlight power consumption of display device and apparatus thereof |
| CN103197557A (en) * | 2013-03-27 | 2013-07-10 | 首都师范大学 | Real-time monitoring closed-loop control system and working method thereof |
| CN105391320A (en) * | 2014-09-09 | 2016-03-09 | 鸿富锦精密工业（深圳）有限公司 | Multi-phase power circuit |
| CN105811776A (en) * | 2016-03-16 | 2016-07-27 | 阳光电源股份有限公司 | Switching power supply circuit |
| CN106533411A (en) * | 2017-01-06 | 2017-03-22 | 电子科技大学 | Self-adaptive turn-off time generating circuit suitable for boost converter |
| US9787184B2 (en) | 2014-09-09 | 2017-10-10 | Hon Hai Precision Industry Co., Ltd. | Multiple-phase power circuit |
| CN112803360A (en) * | 2020-12-31 | 2021-05-14 | 广州极飞科技股份有限公司 | Surge protection circuit, surge protection method and battery power supply circuit |
-
2010
- 2010-04-30 CN CN2010201845040U patent/CN201674212U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102737585A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Method for reducing backlight power consumption of display device and apparatus thereof |
| CN102651544A (en) * | 2012-03-27 | 2012-08-29 | 深圳市朗科电器有限公司 | Over-voltage protection method for field-effect transistor |
| CN102651544B (en) * | 2012-03-27 | 2015-04-15 | 深圳市朗科智能电气股份有限公司 | Over-voltage protection method for field-effect transistor |
| CN103197557A (en) * | 2013-03-27 | 2013-07-10 | 首都师范大学 | Real-time monitoring closed-loop control system and working method thereof |
| CN105391320A (en) * | 2014-09-09 | 2016-03-09 | 鸿富锦精密工业（深圳）有限公司 | Multi-phase power circuit |
| US9787184B2 (en) | 2014-09-09 | 2017-10-10 | Hon Hai Precision Industry Co., Ltd. | Multiple-phase power circuit |
| CN105391320B (en) * | 2014-09-09 | 2018-10-23 | 鸿富锦精密工业（深圳）有限公司 | Polyphase source circuit |
| CN105811776A (en) * | 2016-03-16 | 2016-07-27 | 阳光电源股份有限公司 | Switching power supply circuit |
| CN106533411A (en) * | 2017-01-06 | 2017-03-22 | 电子科技大学 | Self-adaptive turn-off time generating circuit suitable for boost converter |
| CN112803360A (en) * | 2020-12-31 | 2021-05-14 | 广州极飞科技股份有限公司 | Surge protection circuit, surge protection method and battery power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101215 |