CN104125675A - LED lamp dimming circuit - Google Patents
LED lamp dimming circuit Download PDFInfo
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- CN104125675A CN104125675A CN201310153139.5A CN201310153139A CN104125675A CN 104125675 A CN104125675 A CN 104125675A CN 201310153139 A CN201310153139 A CN 201310153139A CN 104125675 A CN104125675 A CN 104125675A
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- resistance
- light source
- source group
- led light
- operation amplifier
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Abstract
The invention provides an LED lamp dimming circuit which is characterized in that the LED lamp dimming circuit comprises a DC power supply, a first resistor, a voltage-stabilizing diode, a load capacitor, an operation amplifier unit, a voltage division unit, a feedback unit and an LED light source group, wherein the voltage division unit comprises a photosensitive resistor. When the photosensitive resistor is in a dark resistance state, the operation amplifier unit controls the LED light source group to be switched-on and to emit light; and when the photosensitive resistor is in a bright resistance state, the operation amplifier unit controls the LED light source group to be switched-off and not to emit light.
Description
Technical field
Relate to circuit field, relate in particular to the control circuit of LED lamp.
Background technology
LED light fixture is widely used in various illuminating industries with this maximum advantage of energy-saving and emission-reduction in recent years.Some LED light fixture has the regulatory function of lamplight brightness, so that the lamplight brightness of LED light fixture can regulate variation with ambient light power.But the existing LED light fixture that can carry out lamplight brightness adjusting is by manually carrying out adjustment operation.Even if there are some can automatically carry out according to ambient light intensity the adjusting LED light fixture of lamplight brightness, but its control circuit is comparatively complicated, and cost is higher.
Summary of the invention
The invention provides a kind of light adjusting circuit of LED lamp, it is characterized in that, comprise: DC power supply, the first resistance, a voltage stabilizing didoe, a load capacitance, an operation amplifier unit, a partial pressure unit, a feedback unit, a LED light source group, wherein, described partial pressure unit comprises a photo resistance, described DC power supply is connected to one end of described the first resistance, described operation amplifier unit, one end of described photo resistance and described LED light source group, the other end of described the first resistance is connected to the negative pole of described voltage stabilizing didoe, one end of load capacitance and described feedback unit, the plus earth of described voltage stabilizing didoe, the other end ground connection of described load capacitance, described feedback unit is connected to operation amplifier unit and described LED light source group, described LED light source group is connected to described operation amplifier unit, one end of described photo resistance is connected to described operation amplifier unit, the other end ground connection of described photo resistance, described operation amplifier unit ground connection, when described photo resistance is resistance in the dark state, described in described operation amplifier unit controls, the conducting of LED light source group is luminous, when described photo resistance is bright resistance state, the cut-off of LED light source group is not luminous described in described operation amplifier unit controls.
Preferably, described operation amplifier unit has: power supply connects pin, is connected to described DC power supply; Grounding pin, ground connection; Positive input pin, is connected to described feedback unit; Negative input pin, is connected to one end of described photo resistance; Output pin, is connected to described LED light source group and described feedback unit, when described photo resistance is resistance in the dark state, and described negative input pin input high level, described output pin output low level; When described photo resistance is bright resistance state, described negative input pin input low level, described output pin output high level.
Preferably, described feedback unit comprises: the second resistance and the 3rd resistance, one end of described the second resistance is connected to one end of one end of described the first resistance, the negative pole of described voltage stabilizing didoe and described load capacitance, the other end of described the second resistance is connected to one end of described positive input pin and described the 3rd resistance, and the other end of described the 3rd resistance is connected to described output pin and described LED light source group.
Preferably, described partial pressure unit also comprises the 5th resistance and the 6th resistance, one end of described the 5th resistance is connected to one end of described DC power supply, described the first resistance, described LED light source group and described power supply and connects pin, the other end of described the 5th resistance is connected to one end of described the 6th resistance, the other end of described the 6th resistance is connected to one end and the described operation amplifier unit of described photo resistance, regulates described the 5th resistance and the 6th resistance so that the input voltage of described negative input pin to be set.
Preferably, described the 6th resistance is a variable resistance.
Preferably, also comprise one the 4th resistance, one end of described the 4th resistance is connected to described LED light source group, and the other end of described the 4th resistance is connected to one end and described the 5th resistance of described DC power supply, described power supply connection pin, described the first resistance, and described the 4th resistance is for current limliting.
Preferably, also comprise an electric capacity, one end of described electric capacity is connected to described the 6th one end of resistance, one end of described photo resistance and described negative input pin, the other end ground connection of described electric capacity, and described electric capacity is stablized the input voltage of described negative input pin.
Preferably, described electric capacity is an electrochemical capacitor, and the positive pole of described electric capacity is connected to described the 6th one end of resistance, one end of described photo resistance and described negative input pin, the minus earth of described electric capacity.
Preferably, it is characterized in that, described LED light source group comprises a light-emitting diode or a plurality of light-emitting diode.
Preferably, it is characterized in that, described voltage stabilizing didoe is a Schottky diode.
The present invention utilizes the light adjusting circuit of the LED light fixture of some universal components compositions, its characteristic is suitable for outdoor application: can be according to the strong and weak automatic regulating lightness of surrounding environment light, realized the function that light fixture lamp on daytime extinguishes, evening, lamp was opened automatically, make LED light fixture realize intelligent control, reduce manual operation cost.
Accompanying drawing explanation
Fig. 1 shows first embodiment of the invention, a kind of circuit diagram of light adjusting circuit of LED lamp.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
Fig. 1 shows first embodiment of the invention, a kind of circuit diagram of light adjusting circuit of LED lamp.The light adjusting circuit of LED lamp comprises DC power supply, the first resistance 91, a voltage stabilizing didoe 1, a load capacitance 2, an operation amplifier unit 7, a partial pressure unit 5, a feedback unit 6 and a LED light source group 8.Operation amplifier unit 7 has power supply and connects pin 73, grounding pin 71, positive input pin 74, negative input pin 75 and output pin 72.Feedback unit 6 comprises the second resistance 92 and the 3rd resistance 93.Partial pressure unit 5 comprises photo resistance 3, the 5th resistance 95 and the 6th resistance 96.
LED light source group 8 comprises a light-emitting diode or a plurality of light-emitting diode.Preferably, LED light source group 8 comprises a plurality of light-emitting diodes, a plurality of light-emitting diode series connection.The positive pole of each light-emitting diode is connected to the negative pole of another light-emitting diode.LED light source group 8 is connected to other elements by the light-emitting diode at two ends.Negative pole using the negative pole of first light-emitting diode of LED light source group 8 high order ends (as shown in Figure 1) as LED light source group 8.Positive pole using the positive pole of first light-emitting diode of LED light source group 8 low order ends (as shown in Figure 1) as LED light source group 8.
DC power supply is connected to one end of the first resistance 91, the power supply of operation amplifier unit 7 connects pin 73, one end of the 5th resistance 95 and the positive pole of LED light source group 8.The other end of the first resistance 91 is connected to one end of the negative pole of voltage stabilizing didoe 2, one end of load capacitance 3 and the second resistance 92.The plus earth of voltage stabilizing didoe 2.The other end ground connection of load capacitance 3.The other end of the second resistance 92 is connected to one end of the 3rd resistance 93, the positive input pin 74 of operation amplifier unit 7.The other end of the 3rd resistance 93 is connected to the output pin 72 of operation amplifier unit 7 and the negative pole of LED light source group 8.Grounding pin 71 ground connection of operation amplifier unit 7.The output pin 72 of operation amplifier unit 7 is connected to the negative pole of LED light source group 8.The other end of the 5th resistance 95 is connected to one end of the 6th resistance 96.The other end of the 6th resistance 96 is connected to the negative input pin 75 of one end and the operation amplifier unit 7 of photo resistance 3.The other end ground connection of photo resistance 3.
Fig. 1 also illustrates one the 4th resistance 94.One end of the 4th resistance 94 is connected to 8 positive poles of LED light source group, and the other end of the 4th resistance 94 is connected to DC power supply.
Fig. 1 also illustrates an electric capacity 4.Electric capacity 4 preferably, is an electrochemical capacitor.The positive pole of electric capacity 4 is connected to one end of the 6th resistance 96, one end of photo resistance 3 and negative input pin 75, the minus earth of electric capacity 4.
The present invention detects by 3 pairs of surround lightings of photo resistance.When daytime, surround lighting was more intense, photo resistance 3 is bright resistance state, and resistance is tens kilo-ohms.When on that night, environment light ratio is weak, photo resistance 3 is resistance in the dark state, and resistance is several megaohms.Preferably, photo resistance 3 can sense the position of the surround lighting of light fixture exactly.
Photo resistance 3, the 5th resistance 95 and the 6th resistance 96 form dividing potential drop 5.Preferably, the 6th resistance 96 is a variable resistance.The resistance that regulates variable resistance 96, can freely arrange the magnitude of voltage of the bright resistance of photo resistance 3 and resistance in the dark state operation amplifier unit 7 negative input pins 75 constantly, to reach more accurate effect with an automatic light meter.
The positive input pin 74 of operation amplifier unit 7 by voltage stabilizing didoe 1 by voltage clamp at certain value, for operation amplifier unit 7 provides voltage reference.The second resistance 92 and the 3rd resistance 93 form feedback unit 6.
Set the resistance of photo resistance 3, the 5th resistance 95 and the 6th resistance 96 of partial pressure unit 5.When photo resistance 3 is " resistance in the dark ", operation amplifier unit 7 negative input pin 75 input voltages are higher, and output 72 output LOW voltages of operation amplifier unit 7 make 8 conductings of LED light source group luminous.
When photo resistance 3 is " bright resistance ", operation amplifier unit 7 negative input pin 75 input voltages are on the low side, output 72 output HIGH voltages of operation amplifier unit 7, in LED light source group 8 pressure drop of each light-emitting diode too low, cannot conducting.
Wherein, voltage stabilizing didoe preferably, is a Schottky diode.The 4th resistance 94 is for current limliting.
The foregoing is only better possible embodiments of the present invention, not limit the scope of the invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content have been done changes, and is all included in protection scope of the present invention.
Claims (10)
1. a light adjusting circuit for LED lamp, is characterized in that, comprising:
DC power supply, the first resistance, a voltage stabilizing didoe, a load capacitance, an operation amplifier unit, a partial pressure unit, a feedback unit, a LED light source group, wherein, described partial pressure unit comprises a photo resistance;
Described DC power supply is connected to one end of described the first resistance, described operation amplifier unit, one end of described photo resistance and described LED light source group, the other end of described the first resistance is connected to the negative pole of described voltage stabilizing didoe, one end of load capacitance and described feedback unit, the plus earth of described voltage stabilizing didoe, the other end ground connection of described load capacitance, described feedback unit is connected to operation amplifier unit and described LED light source group, described LED light source group is connected to described operation amplifier unit, one end of described photo resistance is connected to described operation amplifier unit, the other end ground connection of described photo resistance, described operation amplifier unit ground connection,
When described photo resistance is resistance in the dark state, the conducting of LED light source group is luminous described in described operation amplifier unit controls;
When described photo resistance is bright resistance state, the cut-off of LED light source group is not luminous described in described operation amplifier unit controls.
2. light adjusting circuit according to claim 1, is characterized in that, described operation amplifier unit has:
Power supply connects pin, is connected to described DC power supply;
Grounding pin, ground connection;
Positive input pin, is connected to described feedback unit;
Negative input pin, is connected to one end of described photo resistance;
Output pin, is connected to described LED light source group and described feedback unit,
When described photo resistance is resistance in the dark state, described negative input pin input high level, described output pin output low level;
When described photo resistance is bright resistance state, described negative input pin input low level, described output pin output high level.
3. light adjusting circuit according to claim 2, is characterized in that, described feedback unit comprises: the second resistance and the 3rd resistance,
One end of described the second resistance is connected to one end of one end of described the first resistance, the negative pole of described voltage stabilizing didoe and described load capacitance, the other end of described the second resistance is connected to one end of described positive input pin and described the 3rd resistance, and the other end of described the 3rd resistance is connected to described output pin and described LED light source group.
4. light adjusting circuit according to claim 2, is characterized in that, described partial pressure unit also comprises the 5th resistance and the 6th resistance,
One end of described the 5th resistance is connected to one end of described DC power supply, described the first resistance, described LED light source group and described power supply and connects pin, the other end of described the 5th resistance is connected to one end of described the 6th resistance, the other end of described the 6th resistance is connected to one end and the described operation amplifier unit of described photo resistance
Regulate described the 5th resistance and the 6th resistance so that the input voltage of described negative input pin to be set.
5. light adjusting circuit according to claim 4, is characterized in that, described the 6th resistance is a variable resistance.
6. light adjusting circuit according to claim 4, is characterized in that, also comprises one the 4th resistance,
One end of described the 4th resistance is connected to described LED light source group, and the other end of described the 4th resistance is connected to one end and described the 5th resistance of described DC power supply, described power supply connection pin, described the first resistance,
Described the 4th resistance is for current limliting.
7. light adjusting circuit according to claim 4, is characterized in that, also comprises an electric capacity, and one end of described electric capacity is connected to described the 6th one end of resistance, one end of described photo resistance and described negative input pin, the other end ground connection of described electric capacity,
Described electric capacity is stablized the input voltage of described negative input pin.
8. light adjusting circuit according to claim 7, is characterized in that, described electric capacity is an electrochemical capacitor, and the positive pole of described electric capacity is connected to described the 6th one end of resistance, one end of described photo resistance and described negative input pin, the minus earth of described electric capacity.
9. according to the light adjusting circuit described in claim 1-8 any one, it is characterized in that, described LED light source group comprises a light-emitting diode or a plurality of light-emitting diode.
10. according to the light adjusting circuit described in claim 1-8 any one, it is characterized in that, described voltage stabilizing didoe is a Schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153139.5A CN104125675B (en) | 2013-04-27 | 2013-04-27 | A kind of light adjusting circuit of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153139.5A CN104125675B (en) | 2013-04-27 | 2013-04-27 | A kind of light adjusting circuit of LED |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104125675A true CN104125675A (en) | 2014-10-29 |
| CN104125675B CN104125675B (en) | 2016-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310153139.5A Active CN104125675B (en) | 2013-04-27 | 2013-04-27 | A kind of light adjusting circuit of LED |
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| CN (1) | CN104125675B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658843A (en) * | 2016-10-24 | 2017-05-10 | 深圳市纽艾迪电子科技有限公司 | Light-controlled LED drive circuit and infrared night vision camera system |
| CN117395838A (en) * | 2023-12-11 | 2024-01-12 | 广东东菱电源科技有限公司 | Photosensitive induction dimming switch circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168453A (en) * | 1977-12-28 | 1979-09-18 | Datapower, Inc. | Variable intensity control apparatus for operating a gas discharge lamp |
| CN201054836Y (en) * | 2007-06-09 | 2008-04-30 | 汕头市龙湖区丹霞小学 | Electrical lighting device |
| CN201345759Y (en) * | 2008-12-19 | 2009-11-11 | 比亚迪股份有限公司 | Switch device and streetlamp |
| CN201444711U (en) * | 2009-06-10 | 2010-04-28 | 成善友 | photoelectric controller |
-
2013
- 2013-04-27 CN CN201310153139.5A patent/CN104125675B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168453A (en) * | 1977-12-28 | 1979-09-18 | Datapower, Inc. | Variable intensity control apparatus for operating a gas discharge lamp |
| CN201054836Y (en) * | 2007-06-09 | 2008-04-30 | 汕头市龙湖区丹霞小学 | Electrical lighting device |
| CN201345759Y (en) * | 2008-12-19 | 2009-11-11 | 比亚迪股份有限公司 | Switch device and streetlamp |
| CN201444711U (en) * | 2009-06-10 | 2010-04-28 | 成善友 | photoelectric controller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658843A (en) * | 2016-10-24 | 2017-05-10 | 深圳市纽艾迪电子科技有限公司 | Light-controlled LED drive circuit and infrared night vision camera system |
| CN106658843B (en) * | 2016-10-24 | 2018-01-23 | 深圳市纽艾迪电子科技有限公司 | A kind of infrared night vision image pickup system |
| CN117395838A (en) * | 2023-12-11 | 2024-01-12 | 广东东菱电源科技有限公司 | Photosensitive induction dimming switch circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104125675B (en) | 2016-08-31 |
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