CN106856641A - A kind of LED desk lamp circuit system - Google Patents
A kind of LED desk lamp circuit system Download PDFInfo
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- CN106856641A CN106856641A CN201510908318.4A CN201510908318A CN106856641A CN 106856641 A CN106856641 A CN 106856641A CN 201510908318 A CN201510908318 A CN 201510908318A CN 106856641 A CN106856641 A CN 106856641A
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Abstract
The present invention discloses a kind of LED desk lamp circuit system, including the AC power, power supply adaptor, LED drive circuit, light adjusting circuit and the LED that is connected into by some LED light sources that are sequentially connected, the AC power is via the power supply adaptor decompression transformation, the drive circuit includes step-down constant-current source PT4115, the light modulation end of the step-down constant-current source PT4115 be connected with the light adjusting circuit, and the drive circuit drives open and close of the LED and bright, dark in the case where the dimmer switch is controlled.AC power is converted the present invention 12V dc sources for being depressured to stabilization by power supply adaptor, then dc source is transformed into the DC constant current power supply of stabilization by step-down constant-current source PT4115, meets the luminous technical requirements of LED light source；Step-down constant-current source is connected with light adjusting circuit, and light adjusting circuit controls the output current of the step-down constant-current source by PWM, so as to realize adjusting the switch and light and shade of LED desk lamp.
Description
Technical field
The present invention relates to a kind of circuit system, specifically a kind of circuit system of LED desk lamp.
Background technology
LED light source is a kind of luminescent device of low-voltage direct-current constant-current source, can not directly be lighted with the AC high voltage of 100~220V, therefore, the mentality of designing of LED desk lamp scheme is, first have to, by the convert alternating current of high pressure into the DC constant current power supply of low pressure, can just light LED light source.The overriding concern that ac-dc conversion is design is depressured and carries out using most economical effective method, current portable type electronic product uses alternating current-direct current buck converter --- the adapter of AC power（Adapter）Just into it is not only economical and practical, present again into but also handy first-selection.The output voltage of adapter will aspire for stability in DC12V, output current will be selected according to the power of the light source of LED, typically to give 30% surplus, by taking the white LED light source of 3 × 1W as an example, the standard operating current of the white light LEDs of 1W should be 350mA, thus the electric current of 3 source-series its circuit needs of LED light is also 350mA, in view of extension LED life and reduction light decay, can be designed as 300mA~330mA, the brightness that will not significantly influence LED luminous, so the output current of adapter should select 750mA~1A's.
The major parameter of LED light source work is VF, IF, and other correlations are color/colour temperature/wavelength/brightness/lighting angle/efficiency/power consumptions etc..LED is a PN junction diode, and only applying enough forward voltages could conduct electric current, and VF forward voltages are that a normal working condition is set up for LED is luminous, and IF forward currents are to promote LED to light, and luminosity is in direct ratio with the electric current for flowing through.
The content of the invention
Goal of the invention：Present invention aim in view of the shortcomings of the prior art, there is provided a kind of LED desk lamp circuit system, the LED desk lamp that safe and stable regulation and switch is made up of some LED light sources.
Technical scheme：LED desk lamp circuit system of the present invention, including the AC power being sequentially connected, power supply adaptor, LED drive circuit, light adjusting circuit and the LED being connected into by some LED light sources, the AC power is via the power supply adaptor decompression transformation, the 12V dc sources of stabilization are provided to the LED drive circuit, the drive circuit includes step-down constant-current source PT4115, the light modulation end of the step-down constant-current source PT4115 is connected with the light adjusting circuit, the light adjusting circuit controls the output current of the step-down constant-current source by PWM, the drive circuit drives opening for the LED under light adjusting circuit control, close and bright, secretly.
Further preferably technical scheme is the present invention, the drive circuit is made up of some rectifiers in parallel, input filter capacitor, starting rheostat and step-down constant-current source PT4115, after the rectifier is in parallel with input filter capacitor, connected with the starting rheostat and LED again, the power input of the step-down constant-current source PT4115 and current sample end are connected on the two ends of the starting rheostat respectively, and the drain terminal of power switch accesses whole circuit after being connected with afterflow inductance, fly-wheel diode.
Preferably, the afterflow inductance is inductance value 68uH~100uH, magnetic circuit closure inductor of the saturation current more than 800mA.
Preferably, the capacitance of the input filter capacitor is 100 uF.
Preferably, output current is more than 1A when the power supply adaptor band is carried.
Beneficial effect：AC power is converted the present invention 12V dc sources for being depressured to stabilization by power supply adaptor, then dc source is transformed into the DC constant current power supply of stabilization by step-down constant-current source PT4115, meets the luminous technical requirements of LED light source；Step-down constant-current source is connected with light adjusting circuit, and light adjusting circuit controls the output current of the step-down constant-current source by PWM, so as to realize adjusting the switch and light and shade of LED desk lamp.
Brief description of the drawings
Fig. 1 is the structural representation of LED desk lamp of the present invention；
Fig. 2 is the circuit diagram of LED drive circuit of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail below by accompanying drawing, but protection scope of the present invention is not limited to the embodiment.
Embodiment：A kind of LED desk lamp circuit system, including the AC power, power supply adaptor, LED drive circuit, light adjusting circuit and the LED that is connected into by some LED light sources that are sequentially connected, as shown in Figure 1, AC power is via power supply adaptor decompression transformation, the 12V dc sources of stabilization are provided to LED drive circuit, output current is more than 1A when power supply adaptor band is carried；Drive circuit includes step-down constant-current source PT4115, and the light modulation end of step-down constant-current source PT4115 be connected with light adjusting circuit, and light adjusting circuit passes through the output current that PWM controls are depressured constant-current source, and drive circuit drives open and close of LED and bright, dark under dimmer switch control.
As shown in Figure 2, drive circuit is made up of some rectifiers in parallel, input filter capacitor, starting rheostat and step-down constant-current source PT4115, after rectifier is in parallel with input filter capacitor, connected with starting rheostat and LED again, the power input of step-down constant-current source PT4115 and current sample end are connected on the two ends of starting rheostat respectively, and the drain terminal of power switch accesses whole circuit after being connected with afterflow inductance, fly-wheel diode；Afterflow inductance is inductance value 68uH~100uH, magnetic circuit closure inductor of the saturation current more than 800mA；The capacitance of input filter capacitor is 100 uF.
Although as described above, having been represented with reference to specific preferred embodiment and having described the present invention, it shall not be construed as to the limitation of itself of the invention.Under the premise of the spirit and scope of the present invention for not departing from appended claims definition, can various changes can be made in the form and details to it.
Claims (5)
1. a kind of LED desk lamp circuit system, it is characterized in that, including the AC power being sequentially connected, power supply adaptor, LED drive circuit, light adjusting circuit and the LED being connected into by some LED light sources, the AC power is via the power supply adaptor decompression transformation, the 12V dc sources of stabilization are provided to the LED drive circuit, the drive circuit includes step-down constant-current source PT4115, the light modulation end of the step-down constant-current source PT4115 is connected with the light adjusting circuit, the light adjusting circuit controls the output current of the step-down constant-current source by PWM, the drive circuit drives opening for the LED under light adjusting circuit control, close and bright, secretly.
2. LED desk lamp circuit system according to claim 1, it is characterized in that, the drive circuit is made up of some rectifiers in parallel, input filter capacitor, starting rheostat and step-down constant-current source PT4115, after the rectifier is in parallel with input filter capacitor, connected with the starting rheostat and LED again, the power input of the step-down constant-current source PT4115 and current sample end are connected on the two ends of the starting rheostat respectively, and the drain terminal of power switch accesses whole circuit after being connected with afterflow inductance, fly-wheel diode.
3. LED desk lamp circuit system according to claim 2, it is characterised in that the afterflow inductance is inductance value 68uH~100uH, magnetic circuit closure inductor of the saturation current more than 800mA.
4. LED desk lamp circuit system according to claim 2, it is characterised in that the capacitance of the input filter capacitor is 100 uF.
5. LED desk lamp circuit system according to claim 1, it is characterised in that output current is more than 1A when the power supply adaptor band is carried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908318.4A CN106856641A (en) | 2015-12-09 | 2015-12-09 | A kind of LED desk lamp circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908318.4A CN106856641A (en) | 2015-12-09 | 2015-12-09 | A kind of LED desk lamp circuit system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106856641A true CN106856641A (en) | 2017-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510908318.4A Pending CN106856641A (en) | 2015-12-09 | 2015-12-09 | A kind of LED desk lamp circuit system |
Country Status (1)
| Country | Link |
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| CN (1) | CN106856641A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107333363A (en) * | 2017-08-28 | 2017-11-07 | 北京小米移动软件有限公司 | Reduce the system and light fixture of electromagnetic interference |
| CN116914020A (en) * | 2023-07-18 | 2023-10-20 | 苏州佳智彩光电科技有限公司 | Be applied to photovoltaic module's infrared welding device |
-
2015
- 2015-12-09 CN CN201510908318.4A patent/CN106856641A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107333363A (en) * | 2017-08-28 | 2017-11-07 | 北京小米移动软件有限公司 | Reduce the system and light fixture of electromagnetic interference |
| CN107333363B (en) * | 2017-08-28 | 2019-05-31 | 北京小米移动软件有限公司 | Reduce the system and lamps and lanterns of electromagnetic interference |
| CN116914020A (en) * | 2023-07-18 | 2023-10-20 | 苏州佳智彩光电科技有限公司 | Be applied to photovoltaic module's infrared welding device |
| CN116914020B (en) * | 2023-07-18 | 2024-02-20 | 苏州佳智彩光电科技有限公司 | Be applied to photovoltaic module's infrared welding device |
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Legal Events
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170616 |