CN101588127A - Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection - Google Patents
Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection Download PDFInfo
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- CN101588127A CN101588127A CNA2008100623806A CN200810062380A CN101588127A CN 101588127 A CN101588127 A CN 101588127A CN A2008100623806 A CNA2008100623806 A CN A2008100623806A CN 200810062380 A CN200810062380 A CN 200810062380A CN 101588127 A CN101588127 A CN 101588127A
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- power supply
- short circuit
- switch voltage
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Abstract
The invention relates to a switch voltage-stabilizing power supply circuit structure which comprises three simplest triode structures. The circuit can be in a protection state when the output end is subjected to a short circuit, overcurrent and overheating due to a mutual restraint structure among components in design.
Description
Affiliated technical field
The present invention relates to employed Switching Power Supply in electronic equipment, particularly, relate to can have output short circuit protection, switching power supply that high security is sought in overcurrent protection, temperature protection.
Background technology
Switching power supply (abbreviation Switching Power Supply), volume is little, in light weight, cost is low, therefore is widely used in the various electronic equipments such as Industry Control, communication office, consumer electronics.But the requirement of power supply is different and different with the concrete application of electronic equipment, all has different technical indicators, especially various defencive functions, and short-circuit protection still is important as most important function wherein.And in the product of some cost sensitivities, often require with minimum cost, the circuit structure of simplifying is most finished.
The Switching Power Supply of simplifying most is made up of power adjustment pipe, amplifier tube, voltage sampling pipe and series resonant circuit.Perhaps additionally increase expanded circuits such as current sample, temperature protection on this basis and realize defencive functions such as short-circuit protection, overcurrent protection, temperature protection.Therefore there is following shortcoming in the universal switch stabilized voltage power supply at present:
1, the Switching Power Supply that possesses short-circuit protection, overcurrent protection, temperature protection all needs to use and surpasses 3 triodes, and integrated cost is high slightly, complex structure, component number is many, maintenance difficulty is big relatively.
2, only do not possess short-circuit protection, overcurrent protection, temperature protection function, poor safety performance with the simplification Switching Power Supply of three triodes compositions.
Summary of the invention
In order to overcome the above-mentioned shortcoming of present Switching Power Supply, the present invention discloses a kind of low cost, simple in structure and only form with three triodes, possesses the switching power supply of output short circuit protection, overcurrent protection, temperature protection ability simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: (Fig. 1) by power adjustment pipe Q1, and amplifier tube Q2, voltage sampling pipe Q3 and RC series resonant circuit R2C2 etc. has formed the most basic switching power supply.R8 in this circuit; R9 not still the sampling resistor of Q3 formed simultaneously the biasing circuit of Q3 with R12; and R12 and R7; R6 has formed the biasing circuit of Q2 together again; and R7 itself is the load resistance of Q3 is the biasing resistor of Q2; most critical be that the operating current of Q2 and Q3 is not only obtained from input Vin indirectly by R12 and D1; directly provide by output end vo ut especially simultaneously, cause Q1 to end so when shorted to earth or overcurrent take place output end vo ut, can make Q2 and Q3 lose the job electric current and enter guard mode.
The invention has the beneficial effects as follows:
1, whole power supply is only formed with three triodes and a small amount of resistance capacitance inductance, and is with low cost.
2, Switching Power Supply is simple in structure, easy to maintenance.
3, because component number is few, so energy consumption is low.
4, under the state of simplifying most, but possess overcurrent, short circuit, temperature protection function.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a circuit diagram of the present invention.
Embodiment
1 couple of the utility model embodiment is described in further detail below in conjunction with accompanying drawing.
Q1 is a power adjustment pipe, and Q2 is an amplifier tube, and Q3 is the voltage sampling pipe.
Vin links to each other with C1 by D1; C1 ground connection; The emitter of Q1 is connected with Vin by D1; The emitter of Q1 links to each other with the base stage of Q1 by R1; The collector electrode of Q1 is by D2 ground connection; The collector electrode of Q1 is connected to Vout by L1; The base stage of Q1 links to each other with the collector electrode of Q2 by R3; The base stage of Q2 links to each other with the Q1 collector electrode by the C2 R2 that links to each other with R2; The base stage of Q2 is by R6 ground connection; The emitter of Q2 is by R5 ground connection; R6, R5 ground connection link to each other; The base stage of Q2 links to each other with the collector electrode of Q3; The collector electrode of Q3 links to each other with Vout by R7; The collector electrode of Q3 links to each other with emitter by R6; The grounded emitter of Q3; The emitter of Q3 links to each other with the Q3 base stage by R9, D3; The grounded emitter of Q3; The base stage of Q3 links to each other with Vout by D3, R8; Vout is by C3 ground connection; Vin links to each other with the collector electrode of Q3 by D1, R12, R7; Vin links to each other with the base stage of Q2 by D1, R12, R7; L1 links to each other with Vout.
Claims (4)
1. owing to the conditioning each other design between the components and parts in the circuit makes this circuit can enter guard mode when output is short-circuited with overcurrent.
2. R8 in this circuit, R9 not still the sampling resistor of Q3 formed the biasing circuit of Q3 simultaneously with R12, R12 and R7, R6 have formed the biasing circuit of Q2 together again, R7 itself be the load resistance of Q3 be again the biasing resistor of Q2.
3.Q2 not only obtain indirectly from input Vin with the operating current of Q3, directly provide by output end vo ut especially simultaneously by R12 and D1.
4. in the right one described switching power circuit R1 is replaced to the thermistor of negative temperature coefficient, can also have the function of overtemperature protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100623806A CN101588127A (en) | 2008-05-20 | 2008-05-20 | Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100623806A CN101588127A (en) | 2008-05-20 | 2008-05-20 | Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101588127A true CN101588127A (en) | 2009-11-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100623806A Pending CN101588127A (en) | 2008-05-20 | 2008-05-20 | Simplest switch voltage-stabilizing power supply with short circuit overcurrent and overheating protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101588127A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986492A (en) * | 2010-11-08 | 2011-03-16 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
| CN102368607A (en) * | 2011-10-27 | 2012-03-07 | 山东超越数控电子有限公司 | Power-off protection system for electronic product drop process |
| CN102780199A (en) * | 2011-05-13 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overcurrent protection circuit and lamp |
| CN103001177A (en) * | 2011-09-19 | 2013-03-27 | 海洋王（东莞）照明科技有限公司 | LED lamp and overheat protecting circuit thereof |
| CN103024973A (en) * | 2011-09-23 | 2013-04-03 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN103795051A (en) * | 2012-11-01 | 2014-05-14 | 海洋王（东莞）照明科技有限公司 | Overvoltage protection circuit and lamp |
| CN105430801A (en) * | 2015-12-20 | 2016-03-23 | 合肥艾斯克光电科技有限责任公司 | LED over-current protection circuit |
| CN105578645A (en) * | 2015-12-20 | 2016-05-11 | 合肥艾斯克光电科技有限责任公司 | Over-current protection method of LED driving power supply |
-
2008
- 2008-05-20 CN CNA2008100623806A patent/CN101588127A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986492A (en) * | 2010-11-08 | 2011-03-16 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
| CN101986492B (en) * | 2010-11-08 | 2015-01-28 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
| CN102780199A (en) * | 2011-05-13 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overcurrent protection circuit and lamp |
| CN103001177A (en) * | 2011-09-19 | 2013-03-27 | 海洋王（东莞）照明科技有限公司 | LED lamp and overheat protecting circuit thereof |
| CN103001177B (en) * | 2011-09-19 | 2016-03-30 | 海洋王（东莞）照明科技有限公司 | A kind of LED lamp and overheating protection circuit thereof |
| CN103024973A (en) * | 2011-09-23 | 2013-04-03 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN103024973B (en) * | 2011-09-23 | 2015-04-01 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN102368607A (en) * | 2011-10-27 | 2012-03-07 | 山东超越数控电子有限公司 | Power-off protection system for electronic product drop process |
| CN103795051A (en) * | 2012-11-01 | 2014-05-14 | 海洋王（东莞）照明科技有限公司 | Overvoltage protection circuit and lamp |
| CN103795051B (en) * | 2012-11-01 | 2017-12-15 | 海洋王（东莞）照明科技有限公司 | A kind of overvoltage crowbar and light fixture |
| CN105430801A (en) * | 2015-12-20 | 2016-03-23 | 合肥艾斯克光电科技有限责任公司 | LED over-current protection circuit |
| CN105578645A (en) * | 2015-12-20 | 2016-05-11 | 合肥艾斯克光电科技有限责任公司 | Over-current protection method of LED driving power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Hu Jiong Document name: Notification of Publication of the Application for Invention |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20091125 |