CN205071385U - A control circuit for luminance of high -power LED light source - Google Patents
A control circuit for luminance of high -power LED light source Download PDFInfo
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- CN205071385U CN205071385U CN201520800845.9U CN201520800845U CN205071385U CN 205071385 U CN205071385 U CN 205071385U CN 201520800845 U CN201520800845 U CN 201520800845U CN 205071385 U CN205071385 U CN 205071385U
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- circuit
- control circuit
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- light source
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Abstract
The utility model provides a control circuit for luminance of high -power LED light source comprises voltage conversion circuit, light control circuit, light regulator circuit and constant voltage control circuit, and voltage conversion circuit all adjusts circuit connection with light with the output of light control circuit, and the light control circuit passes through the opto -coupler with the PWM signal and transmits to the light regulator circuit, voltage conversion circuit passes through protection circuit and light adjustment circuit connection, and protection circuit and light regulator circuit are all through transformer and constant voltage control circuit connection, and the protection circuit passes through the secondary coil winding of transformer supplies power for constant voltage control circuit, and the PWM signal is carried the luminance that is used for controlling the LED light source for constant voltage control circuit through the primary winding of transformer to the light regulator circuit. The voltage swing of having realized LED light source under different arrival current conditions maintains a specific level to adjust the electric current of output and carry out the control of luminance through the PWM duty cycle.
Description
Technical field
The utility model relates to a kind of LED light source light adjusting circuit, is specifically related to a kind of control circuit for high-power LED light source brightness.
Background technology
LED is the abbreviation of light-emitting diode, is the one of semiconductor diode, electric energy conversion can be become luminous energy, and due to it, to have operating voltage very low, more several volts had; Operating current is very little, and the only zero point several milliamperes had can be luminous; Shock resistance and anti-seismic performance good, reliability is high, and the life-span is long; Can the feature such as power of modulated luminescence easily by modulating that the electric current that passes through is strong and weak, light-emitting diode is used as light source in some photoelectric control equipments, is used as Signal Monitor in many electronic equipments; And instead of illumination incandescent lamp gradually.
Due to the continuous maturation of technology, current LED changes from non-dimmable to light modulation direction, but existing light adjusting circuit to there is control precision not high, control stability is strong, and the phenomenon of flicker appears in dimming LED (Light Emitting Diode).
Utility model content
The utility model is exactly to solve the problem, and provides a kind of control circuit for high-power LED light source brightness, realizes PWM system for regulating duty cycle output current to regulate its brightness.
The novel technical scheme of this practical sample is as follows:
A kind of control circuit for high-power LED light source brightness, be made up of voltage conversion circuit, lighting control circuit, light Circuit tuning and constant-voltage control circuit four part, described voltage conversion circuit is all connected with light Circuit tuning with the output of lighting control circuit, and the output of described light Circuit tuning is connected with LED light source by constant-voltage control circuit; Pwm signal is passed to light Circuit tuning by optocoupler by described lighting control circuit; described voltage conversion circuit is connected with light Circuit tuning by protective circuit; protective circuit is all connected with constant-voltage control circuit by transformer with light Circuit tuning; protective circuit is powered to constant-voltage control circuit by the secondary coil winding of transformer, and pwm signal is flowed to the brightness that constant-voltage control circuit is used for controlling LED light source by the primary coil winding of transformer by light Circuit tuning.
Further scheme, described voltage conversion circuit comprises the anti-impact circuit being positioned at end of incoming cables, is connected in series rectifier bridge and filter circuit successively after described anti-impact circuit.
Further scheme, described anti-impact circuit forms for preventing voltage instantaneous from impacting by fuse and piezo-resistance; Described filter circuit comprises electric capacity C1, C2 in parallel, and the two ends of described electric capacity C1, C2 are parallel with resistance R25 and inductance L 1.
Described protective circuit is by parallel connection voltage-stabiliser tube D5 together, resistance R11, R5 and electric capacity C5 are formed successively.
Further scheme, described constant-voltage control circuit comprises inductance type controller and constant voltage circuit, and described inductance type controller forms by carrying out parallel connection with voltage-stabiliser tube D4, D6 in parallel again after electric capacity C10 connects with in parallel resistance R21, R20; Described constant voltage circuit is composed in parallel by electric capacity C12, C13, C14, C15, C16, C17 and resistance R22, R24.
Further scheme, described light Circuit tuning comprises current constant control chip (PT4209), the DIM pin of described current constant control chip is connected with lighting control circuit for receiving pwm signal, then exports the output signal by metal-oxide-semiconductor control transformer primary coil winding by DRV pin; The COMP pin of described current constant control chip is by electric capacity C3 ground connection, and the two ends of electric capacity C3 are in series with resistance R1 and electric capacity C18 as comparative level input.
Pwm control signal is sent to the input of light Circuit tuning by the utility model by optocoupler by lighting control circuit; Light Circuit tuning controls constant-voltage control circuit by metal-oxide-semiconductor control transformer primary coil winding.External voltage is passed to transformer by voltage conversion circuit after filtering and rectification, and under the effect of protective circuit and filter circuit, the stable voltage exported in OK range, sends constant-voltage control circuit to through transformer; Simultaneously convert the direct current needed for LED light source to through lighting control circuit, light Circuit tuning.The pwm signal that lighting control circuit sends adjusts the brightness of LED light source by the size that light Circuit tuning adjusts its duty ratio.
Circuit of the present utility model is owing to adopting this four kinds of control circui, voltage conversion circuit output voltage stabilization is made to be 40V, constant-voltage control circuit and light Circuit tuning achieve the constant current output of voltage, the size of current that can realize flowing through LED backlight under different input voltage condition maintains specified level, i.e. a current constant control.In addition, by PWM system for regulating duty cycle output current, thus the adjustment of LED luminance is realized.So this circuit has, function is many, extensibility is strong, structure is simple, overcomes that the function existed in prior art is few, low, the baroque defect of poor expandability, conversion efficiency.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is the utility model schematic block circuit diagram.
Fig. 2 is the utility model circuit diagram.
Embodiment
As shown in Figure 1, 2, a kind of control circuit for high-power LED light source brightness, be made up of voltage conversion circuit 1, lighting control circuit 3, light Circuit tuning 2 and constant-voltage control circuit 4 four part, described voltage conversion circuit 1 is all connected with light Circuit tuning 2 with the output of lighting control circuit 3, and the output of described light Circuit tuning 2 is connected with LED light source 5 by constant-voltage control circuit 4; Pwm signal is passed to light Circuit tuning 2 by optocoupler U1 by described lighting control circuit 3; described voltage conversion circuit 1 is connected with light Circuit tuning 2 by protective circuit; protective circuit is all connected with constant-voltage control circuit 4 by transformer T1 with light Circuit tuning 2; protective circuit is powered to constant-voltage control circuit 4 by the secondary coil winding of transformer T1, and pwm signal is flowed to the brightness that constant-voltage control circuit 4 is used for controlling LED light source 5 by the primary coil winding of transformer T1 by light Circuit tuning 2.
Further scheme, described voltage conversion circuit 1 comprises the anti-impact circuit being positioned at end of incoming cables, is connected in series rectifier bridge and filter circuit successively after described anti-impact circuit.
Further scheme, described anti-impact circuit forms for preventing voltage instantaneous from impacting by fuse F1 and piezo-resistance BD1; Described filter circuit comprises electric capacity C1, C2 in parallel, and the two ends of described electric capacity C1, C2 are parallel with resistance R25 and inductance L 1.
Described protective circuit is by parallel connection voltage-stabiliser tube D5 together, resistance R11, R5 and electric capacity C5 are formed successively.
Further scheme, described constant-voltage control circuit 4 comprises inductance type controller and constant voltage circuit, and described inductance type controller forms by carrying out parallel connection with voltage-stabiliser tube D4, D6 in parallel again after electric capacity C10 connects with in parallel resistance R21, R20; Described constant voltage circuit is composed in parallel by electric capacity C12, C13, C14, C15, C16, C17 and resistance R22, R24.
Further scheme, described light Circuit tuning 2 comprises current constant control chip PT4209, the DIM pin of described current constant control chip is connected with lighting control circuit for receiving pwm signal, then exports the output signal by metal-oxide-semiconductor (Q1, Q2) control transformer primary coil winding by DRV pin; The COMP pin of described current constant control chip is by electric capacity C3 ground connection, and the two ends of electric capacity C3 are in series with resistance R1 and electric capacity C18 as comparative level input.
The interchange Denso of input is changed to direct current by voltage conversion circuit 1 by the utility model, and is powered to constant-voltage control circuit 4 by the secondary coil winding of protective circuit and transformer T1; Inputted the voltage of different duty by light Circuit tuning 2, under realizing pressure constant state, export different size of current, make constant-voltage control circuit 4 by voltage stabilization at 40V, thus control the brightness of LED light source 5.Namely constant-voltage control circuit 4 and light Circuit tuning 2 achieve LED light source 5 at the output current waiting pressure different, namely different PWM is inputted by input, the voltage constant that load keeps is 40V, but electric current can change along with the change of PWM duty ratio, thus achieves the adjustment of light.
Claims (6)
1. the control circuit for high-power LED light source brightness, it is characterized in that: be made up of voltage conversion circuit, lighting control circuit, light Circuit tuning and constant-voltage control circuit four part, described voltage conversion circuit is all connected with light Circuit tuning with the output of lighting control circuit, and the output of described light Circuit tuning is connected with LED light source by constant-voltage control circuit; Pwm signal is passed to light Circuit tuning by optocoupler by described lighting control circuit; described voltage conversion circuit is connected with light Circuit tuning by protective circuit; protective circuit is all connected with constant-voltage control circuit by transformer with light Circuit tuning; protective circuit is powered to constant-voltage control circuit by the secondary coil winding of transformer, and pwm signal is flowed to the brightness that constant-voltage control circuit is used for controlling LED light source by the primary coil winding of transformer by light Circuit tuning.
2. a kind of control circuit for high-power LED light source brightness according to claim 1, is characterized in that: described voltage conversion circuit comprises the anti-impact circuit being positioned at end of incoming cables, is connected in series rectifier bridge and filter circuit successively after described anti-impact circuit.
3. a kind of control circuit for high-power LED light source brightness according to claim 2, is characterized in that: described anti-impact circuit forms for preventing voltage instantaneous from impacting by fuse and piezo-resistance; Described filter circuit comprises electric capacity C1, C2 in parallel, and the two ends of described electric capacity C1, C2 are parallel with resistance R25 and inductance L 1.
4. a kind of control circuit for high-power LED light source brightness according to claim 1, is characterized in that: described protective circuit is by parallel connection voltage-stabiliser tube D5 together, resistance R11, R5 and electric capacity C5 are formed successively.
5. a kind of control circuit for high-power LED light source brightness according to claim 1, it is characterized in that: described constant-voltage control circuit comprises inductance type controller and constant voltage circuit, described inductance type controller forms by carrying out parallel connection with voltage-stabiliser tube D4, D6 in parallel again after electric capacity C10 connects with in parallel resistance R21, R20; Described constant voltage circuit is composed in parallel by electric capacity C12, C13, C14, C15, C16, C17 and resistance R22, R24.
6. a kind of control circuit for high-power LED light source brightness according to claim 1, it is characterized in that: described light Circuit tuning comprises current constant control chip, the DIM pin of described current constant control chip is connected with lighting control circuit for receiving pwm signal, then exports the output signal by metal-oxide-semiconductor control transformer primary coil winding by DRV pin; The COMP pin of described current constant control chip is by electric capacity C3 ground connection, and the two ends of electric capacity C3 are in series with resistance R1 and electric capacity C18 as comparative level input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800845.9U CN205071385U (en) | 2015-10-13 | 2015-10-13 | A control circuit for luminance of high -power LED light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800845.9U CN205071385U (en) | 2015-10-13 | 2015-10-13 | A control circuit for luminance of high -power LED light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205071385U true CN205071385U (en) | 2016-03-02 |
Family
ID=55397881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520800845.9U Expired - Fee Related CN205071385U (en) | 2015-10-13 | 2015-10-13 | A control circuit for luminance of high -power LED light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205071385U (en) |
-
2015
- 2015-10-13 CN CN201520800845.9U patent/CN205071385U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20181013 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |