CN202261061U - Constant current output flyback converter - Google Patents
Constant current output flyback converter Download PDFInfo
- Publication number
- CN202261061U CN202261061U CN2011203821505U CN201120382150U CN202261061U CN 202261061 U CN202261061 U CN 202261061U CN 2011203821505 U CN2011203821505 U CN 2011203821505U CN 201120382150 U CN201120382150 U CN 201120382150U CN 202261061 U CN202261061 U CN 202261061U
- Authority
- CN
- China
- Prior art keywords
- switching tube
- flyback converter
- constant current
- transformer
- pwm
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Dc-Dc Converters (AREA)
Abstract
The utility model includes a constant current output flyback converter including a flyback converter (1) and a pulse width modulation circuit (2). The flyback converter is composed of a transformer T, a diode D, a capacitor C, a resistor RS and an equivalent load RL. The PWM (Pulse Width Modulation) circuit (2) connects with a negative terminal of the equivalent load RL and the PWM circuit (2) is formed by connecting an error amplifier (3), a PWM generator (6) and a switching tube Q grid electrode in series successively. A switching tube Q drain electrode connects with a primary inductor of the transformer T. A switching tube Q source electrode is in a ground connection through the resistor RC. A clock signal is provided for the PWM generator by a clock (5). In the utility model, input and output are electrically isolated. An input voltage range is wide. The cost is low. The reliability is high. When an input voltage and a load resistor are changed, an output current of the constant current output flyback converter is constant.
Description
Technical field
The utility model relates to a kind of converters, especially a kind of constant current output anti exciting converter.
Background technology
Large-power light-emitting diodes (LED) has high light efficiency, high reliability, long-life and advantage such as radiationless; Be regarded as a kind of new type light source that possibly replace conventional light source such as incandescent lamp, fluorescent lamp, this makes designing high-power LED illumination driving circuit seem and very is necessary.The mean forward current of LED is along with the increase of forward voltage presents significantly linear growth, and the electric current of LED and luminous quantity are linear, so the drive circuit of great power LED adopts constant current drive mode more.
The utility model content
The purpose of the utility model is that a kind of constant current output anti exciting converter will be provided, output and input electrical isolation, and wide input voltage range, cost is low, and reliability is high.
For achieving the above object; The utility model comprises anti exciting converter and pulse width modulation circuit; Anti exciting converter is made up of transformer T, diode D, capacitor C, resistance R S and equivalent load RL; Said pulse width modulation circuit is connected in equivalent load RL negative terminal, is in series successively by error amplifier, PWM comparator, PWM generator and switching tube Q grid, and wherein switching tube Q drain electrode links to each other with transformer T primary inductance; Switching tube Q source electrode is through resistance R C ground connection, and clock signal offers PWM generator by clock.
Anti exciting converter when work switching tube Q conducting, input voltage U is added on the transformer T, and diode D ends, and transformer T storage power is when leaving hanging tube Q and close, to the RL energy supply.
Pulse width modulation circuit compares with la tension de reference Uref est after through resistance R s output current being sampled, and error signal and the primary current feedback signal with output compares again, and the duty ratio of generation PWM by-pass cock pipe Q makes output current keep constant.
The advantage of the utility model is that the working voltage scope is wide, and when changing input voltage and load resistance, the output current of converter is constant.
Description of drawings
Fig. 1 is the utility model constant current output anti exciting converter circuit diagram.
Embodiment
The utility model comprises anti exciting converter (1) and pulse width modulation circuit (2); Anti exciting converter is made up of transformer T, diode D, capacitor C, resistance R S and equivalent load RL; Said pulse width modulation circuit (2) is connected in equivalent load RL negative terminal; Be in series successively by error amplifier (3), PWM comparator (4), PWM generator (6) and switching tube Q grid; Wherein switching tube Q drain electrode links to each other with transformer T primary inductance, and switching tube Q source electrode is through resistance R C ground connection, and clock signal offers PWM generator by clock (5).
Fig. 1 is a utility model constant current output anti exciting converter circuit diagram, switching tube Q conducting during anti exciting converter (1) work, and input voltage U is added on the transformer T, and diode D ends, and transformer T storage power is when leaving hanging tube Q and close, to the RL energy supply.Pulse width modulation circuit (2) compares with output current sampling back resistance R s through error amplifier (3) and la tension de reference Uref est; Obtain the error signal of amplification ratio after; This output error signal and primary current feedback signal are through PWM comparator (4) relatively; And the signal that relatively obtains sent into PWM generator (6); PWM generator (6) combines clock (5) to generate pwm control signal control switch pipe Q, and is constant through the duty ratio assurance output current maintenance of by-pass cock pipe Q.
Claims (1)
1. anti exciting converter is exported in a constant current; Comprise anti exciting converter (1) and pulse width modulation circuit (2); Anti exciting converter is made up of transformer T, diode D, capacitor C, resistance R S and equivalent load RL; It is characterized in that: said pulse width modulation circuit (2) is connected in equivalent load RL negative terminal, is in series successively by error amplifier (3), PWM comparator (4), PWM generator (6) and switching tube Q grid, and wherein switching tube Q drain electrode links to each other with transformer T primary inductance; Switching tube Q source electrode is through resistance R C ground connection, and clock signal offers PWM generator by clock (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203821505U CN202261061U (en) | 2011-10-10 | 2011-10-10 | Constant current output flyback converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203821505U CN202261061U (en) | 2011-10-10 | 2011-10-10 | Constant current output flyback converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261061U true CN202261061U (en) | 2012-05-30 |
Family
ID=46122242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203821505U Expired - Fee Related CN202261061U (en) | 2011-10-10 | 2011-10-10 | Constant current output flyback converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202261061U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740560A (en) * | 2012-06-01 | 2012-10-17 | 浙江中怿光电有限公司 | LED (Light Emitting Diode) lamp adjusting color temperature by adopting (PWM Pulse-Width Modulation) controller |
| CN102946666A (en) * | 2012-09-24 | 2013-02-27 | 宁波凯耀电器制造有限公司 | Buck-boost control circuit of LED (Light Emitting Diode) lamp |
-
2011
- 2011-10-10 CN CN2011203821505U patent/CN202261061U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740560A (en) * | 2012-06-01 | 2012-10-17 | 浙江中怿光电有限公司 | LED (Light Emitting Diode) lamp adjusting color temperature by adopting (PWM Pulse-Width Modulation) controller |
| CN102946666A (en) * | 2012-09-24 | 2013-02-27 | 宁波凯耀电器制造有限公司 | Buck-boost control circuit of LED (Light Emitting Diode) lamp |
| CN102946666B (en) * | 2012-09-24 | 2014-11-05 | 宁波凯耀电器制造有限公司 | Buck-boost control circuit of LED (Light Emitting Diode) lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20121010 |