CN2236669Y - Single-end flyback switching power supply - Google Patents
Single-end flyback switching power supply Download PDFInfo
- Publication number
- CN2236669Y CN2236669Y CN 95223931 CN95223931U CN2236669Y CN 2236669 Y CN2236669 Y CN 2236669Y CN 95223931 CN95223931 CN 95223931 CN 95223931 U CN95223931 U CN 95223931U CN 2236669 Y CN2236669 Y CN 2236669Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- switching power
- flyback switching
- pulse width
- ended
- 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.)
- Expired - Fee Related
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- 230000033228 biological regulation Effects 0.000 abstract description 9
- 101150087393 PIN3 gene Proteins 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 2
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 2
- 101150068246 V-MOS gene Proteins 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a single-ended flyback switching power supply to single-ended output power supply control type pulse width modulator UC3842 constitutes switching power supply as the main part, and it includes that a primary current by UC 3842's current sensing end (PIN3) detects switching transformer T directly changes pulse width's control closed circuit, and its characterized in that, it still includes one by photoelectric isolator U2Differential voltage amplifier U3And an output voltage feedback branch consisting of a resistor and a capacitor, wherein the input end of the feedback voltage of the UC3842 is connected with the series RC branch to the ground. The single-ended flyback switching power supply has the advantages that stable voltage output is still guaranteed for variable loads which are randomly changed, the load regulation rate is excellent, the performance of the existing single-ended flyback switching power supply is improved, and the application range of the single-ended flyback switching power supply is expanded.
Description
The utility model relates to a kind of switching power supply, particularly a kind of single-end flyback switching power supply.
Advantages such as existing single-end flyback switching power supply is a kind of of switching power supply, and circuit is succinct, with low cost though it has, voltage regulation factor is good, it only is suitable for relatively-stationary load, and to any variable load, its load regulation is very poor.I.e. output voltage variation in a big way when load variations, voltage regulation result is extremely undesirable, thereby has limited the widespread use of single-end flyback switching power supply.
The purpose of this utility model is to provide a kind of single-end flyback switching power supply, and it also possesses outstanding load regulation except all advantages that possess existing single-end flyback switching power supply, and to the variable load of any variation, guaranteeing has stable voltage output.
The purpose of this utility model is to realize like this, with single-ended output current control type pulse width modulator UC3842 is the Switching Power Supply that main body constitutes, and it has two control closed circuits: one is that the current sense end (PIN3) of UC3842 is used for the elementary n of detector switch transformer (T)
1Electric current, the variation of input voltage needn't just directly change pulse width through feedback control loop like this, to reach stablizing of output voltage, make circuit possess good voltage regulation factor; One is that output voltage feeds back to the built-in error amplifier feedback voltage of UC3842 input end (PIN2) by photoisolator, is used to control the output voltage that causes because of load variations and changes, and makes circuit possess good load regulation.
Compared with prior art, the utility model switch transformer feedback of no use winding n
2Feedback voltage signal is provided, but by photoisolator U
2Directly the feedback output voltage signal need connect series connection RC branch road to ground as feedback voltage signal at UC38 42 feedback voltage input ends, makes control stabilization, and the precision of voltage regulation improves, and has improved its load regulation greatly.Its stable performance, reliable operation.Greatly perfect existing single-end flyback switching power supply performance has been expanded its range of application.
The contrast accompanying drawing is further set forth the utility model below:
Fig. 1 is for realizing circuit theory synoptic diagram of the present utility model
Circuit will be by UC3842, switch transformer T, V-MOS switching tube, fast recovery diode D
3, error voltage amplifier U
3, photoisolator U
2And resistance capacitance constitutes; N among the T
1With V-MOS pipe, Rs forms the current sense branch road, to change pulse width, realizes the input voltage adjustment by the electric current of the PIN3 detection branch of UC3842; U
2, U
3And R, C composition output voltage feedback branch, by the PIN2 end input feedback signal of UC3842, realize the output voltage adjustment, wherein, R, C series arm are to realize the key of this utility model, it makes FEEDBACK CONTROL be stablized realization.
Claims (1)
- A kind of single-end flyback switching power supply, with single-ended output current control type pulse width modulator UC3842 is that main body constitutes Switching Power Supply, it comprises that a primary current by current sense end (PIN3) the detector switch transformer T of UC3842 directly changes the control closed-loop path of pulse width, it is characterized in that it also comprises one by photoisolator U 2, potential difference amplifier U 3And the output voltage feedback branch that resistance hinders, electric capacity is formed, need connect series connection RC branch road to ground at UC3842 feedback voltage input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95223931 CN2236669Y (en) | 1995-10-26 | 1995-10-26 | Single-end flyback switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95223931 CN2236669Y (en) | 1995-10-26 | 1995-10-26 | Single-end flyback switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2236669Y true CN2236669Y (en) | 1996-10-02 |
Family
ID=33870855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95223931 Expired - Fee Related CN2236669Y (en) | 1995-10-26 | 1995-10-26 | Single-end flyback switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2236669Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375379C (en) * | 2004-01-13 | 2008-03-12 | 台达电子工业股份有限公司 | Exchange type power supply and oscillator frequency adjuster thereof |
| CN100438598C (en) * | 2006-03-17 | 2008-11-26 | 深圳创维－Rgb电子有限公司 | Reverse-excitation power supply |
| CN101582639B (en) * | 2008-05-16 | 2011-06-15 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN102480232A (en) * | 2010-11-30 | 2012-05-30 | 永济新时速电机电器有限责任公司 | Single-ended flyback switching power supply and control device thereof |
| CN104426377A (en) * | 2013-09-03 | 2015-03-18 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN104917222A (en) * | 2015-01-05 | 2015-09-16 | 惠州市英盟科技有限公司 | Electric-vehicle vehicle-mounted digital charger |
| CN105762630A (en) * | 2016-04-20 | 2016-07-13 | 华北电力大学（保定） | Laser drive circuit of single-ended flyback circuit |
-
1995
- 1995-10-26 CN CN 95223931 patent/CN2236669Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375379C (en) * | 2004-01-13 | 2008-03-12 | 台达电子工业股份有限公司 | Exchange type power supply and oscillator frequency adjuster thereof |
| CN100438598C (en) * | 2006-03-17 | 2008-11-26 | 深圳创维－Rgb电子有限公司 | Reverse-excitation power supply |
| CN101582639B (en) * | 2008-05-16 | 2011-06-15 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN102480232A (en) * | 2010-11-30 | 2012-05-30 | 永济新时速电机电器有限责任公司 | Single-ended flyback switching power supply and control device thereof |
| CN104426377A (en) * | 2013-09-03 | 2015-03-18 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN104426377B (en) * | 2013-09-03 | 2017-02-08 | 聚龙股份有限公司 | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor |
| CN104917222A (en) * | 2015-01-05 | 2015-09-16 | 惠州市英盟科技有限公司 | Electric-vehicle vehicle-mounted digital charger |
| CN104917222B (en) * | 2015-01-05 | 2018-08-10 | 惠州市英盟科技有限公司 | Electric-vehicle-mounted digital charger |
| CN105762630A (en) * | 2016-04-20 | 2016-07-13 | 华北电力大学（保定） | Laser drive circuit of single-ended flyback circuit |
| CN105762630B (en) * | 2016-04-20 | 2019-03-01 | 华北电力大学（保定） | A kind of single-ended reverse exciting circuit laser device driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |