CN203301829U - LED lighting drive circuit - Google Patents
LED lighting drive circuit Download PDFInfo
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- CN203301829U CN203301829U CN2013203803262U CN201320380326U CN203301829U CN 203301829 U CN203301829 U CN 203301829U CN 2013203803262 U CN2013203803262 U CN 2013203803262U CN 201320380326 U CN201320380326 U CN 201320380326U CN 203301829 U CN203301829 U CN 203301829U
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Abstract
The utility model provides an LED lighting drive circuit. The LED lighting drive circuit includes a DC/DC converting circuit connected with an LED lamp load; a constant current drive control unit; a first current collecting unit connected with the DC/DC converting circuit; and a signal output unit. By applying the LED lighting drive circuit provided by the utility model, convenience is made for constant current point regulation and production efficiency is improved.
Description
Technical field
The utility model relates to LED and drives control field, is specifically related to a kind of LED illumination driving circuit.
Background technology
Under the background that Present Global energy starved worry raises once again, energy savings is the important problem that we shall face future.According to statistics, China's electric consumption on lighting accounts for 12% of social total electricity consumption, therefore aspect electric consumption on lighting, carries out energy conservation conservation of power resource effectively.
LED (Light Emitting Diode, light-emitting diode) a kind ofly can directly be converted into electricity the semiconductor device of visible light.LED is applied to the demonstration of indicator light, numeral and word the earliest.Along with the appearance of white light LEDs, high, the little power consumption of its low-work voltage that has advantages of, luminous efficiency, life-span are long in addition, and LED obtains applying more and more widely at lighting field, and it is than incandescent lamp saving energy 80%, than fluorescent lamp energy saving approximately 50%.
Existing LED illumination driving circuit is as shown in Figure 1: comprise power supply, constant current driving control unit, inductance L, switching tube Q, resistance R, diode D, capacitor C; Wherein an end of inductance L is connected with the negative pole of diode D with the source electrode of switching tube Q respectively, the other end of inductance L is connected with the positive pole of LED, the negative pole of LED is by resistance R ground connection, the other end of inductance L is connected with the negative pole of LED by capacitor C, the control end of constant current driving control unit is connected with the grid of switching tube Q, the sampling end of constant current driving control unit is connected between the negative pole and resistance R of LED, the plus earth of diode D.During existing LED Drive and Control Circuit work, power supply is given respectively DC/DC change-over circuit and the power supply of constant current driving control unit, the constant current Drive and Control Circuit is according to the electric current of resistance R sampling DC/DC change-over circuit, and according to the turn-on and turn-off of this sample rate current control switch pipe Q, to control the constant current value of DC/DC change-over circuit output one.But this LED drive circuit, if will adjust the constant current point of DC/DC change-over circuit, need to realize by the resistance that changes resistance R, for the adjustment of constant current point has brought inconvenience.
Summary of the invention
The technical problems to be solved in the utility model is the problem that LED illumination driving circuit of the prior art can not be adjusted constant current point easily.For solving the technical problem that exists in prior art, the utility model provides a kind of LED illumination driving circuit, comprising:
The DC/DC change-over circuit, it is connected with the LED lamp load, in order to according to the constant current control signal, being LED lamp load output driving current;
The constant current driving control unit, in order to the described constant current control signal of the first sampled signal output according to PWM dim signal and reflection DC/DC change-over circuit inductive current size;
The first current acquisition unit, it is connected with the DC/DC change-over circuit, in order to gather the electric current of inductance in the DC/DC change-over circuit, produces described the first sampled signal;
Signal output unit, in order to basis and the corresponding equivalent duty cycle information of external dimmer control signal, export the PWM dim signal with initial duty cycle, and according to the duty cycle adjustment signal of reflection external dimmer control signal and the second sampled signal comparative result, the duty ratio of described PWM dim signal is adjusted to a predetermined duty cycle by described initial duty cycle, described the second sampled signal reflection LED lamp load size of current.
further, described DC/DC change-over circuit comprises: the first switching tube, the first inductance, the first diode, the first capacitor C, wherein the source electrode of the first switching tube is connected with the negative pole of the first diode with an end of the first inductance respectively, the other end of the first inductance is connected with the positive pole of LED lamp load with an end of the first electric capacity respectively, the other end of the first electric capacity is connected with the negative pole of LED lamp load, the negative pole of LED lamp load is by the first current acquisition unit ground connection, between the negative pole of LED lamp load and the first current acquisition unit, be provided with the current acquisition end, the current acquisition end is connected with signal output unit, the control end of constant current driving control unit is connected with the grid of the first switching tube, the plus earth of the first diode.
Further, described the first current acquisition unit is the first resistance, and the sampling end of constant current driving unit is connected with the ungrounded end of the first resistance.
further, described constant current driving control unit comprises: control chip, the 4th electric capacity, the 9th resistance, the tenth resistance, optocoupler, wherein the positive pole of optocoupler input side receives described PWM dim signal, the minus earth of optocoupler input side, the collector electrode of optocoupler outlet side is through the 9th resistance welding system power supply, the emitter of optocoupler outlet side is connected with the light modulation end of control chip, the tenth resistance and the 4th electric capacity are connected between the light modulation end and ground of control chip, the control end of control chip is connected with the control end of switching tube in the DC/DC change-over circuit, the feedback end of control chip is connected with the first current acquisition unit, the power end welding system power supply of control chip.
Compared with prior art, the adjusting that LED illumination driving circuit of the present utility model can be constant current point offers convenience, and enhances productivity.
The accompanying drawing explanation
Fig. 1 is a kind of LED illumination driving circuit structure chart of the prior art;
Fig. 2 is a kind of LED illumination driving circuit structure chart of the utility model embodiment;
Fig. 3 is the another kind of LED illumination driving circuit structure chart of the utility model embodiment;
Fig. 4 is another LED illumination driving circuit structure chart of the utility model embodiment.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 2, Fig. 3 and Fig. 4 are the LED illumination driving circuit structure charts of the utility model embodiment, comprising:
DC/DC change-over circuit 20, it is connected with the LED lamp load, in order to according to the constant current control signal, being LED lamp load output driving current;
Constant current driving control unit 10, in order to the described constant current control signal of the first sampled signal output according to PWM dim signal and reflection DC/DC change-over circuit inductive current size;
The first current acquisition unit 30, it is connected with the DC/DC change-over circuit, in order to gather the electric current of inductance in the DC/DC change-over circuit, produces described the first sampled signal;
particularly, described DC/DC change-over circuit comprises: the first switching tube Q, the first inductance L, the first diode D, the first capacitor C, wherein the source electrode of the first switching tube is connected with the negative pole of the first diode with an end of the first inductance respectively, the other end of the first inductance is connected with the positive pole of LED lamp load with an end of the first electric capacity respectively, the other end of the first electric capacity is connected with the negative pole of LED lamp load, the negative pole of LED lamp load is by the first current acquisition unit ground connection, between the negative pole of LED lamp load and the first current acquisition unit, be provided with current acquisition end S, the current acquisition end is connected with signal output unit, the control end of constant current driving control unit is connected with the grid of the first switching tube, the plus earth of the first diode.Described DC/DC change-over circuit also can use the booster type circuit in certain embodiments.
Particularly, described the first current acquisition unit is the first resistance R, and the sampling end of constant current driving unit is connected with the ungrounded end of the first resistance.
particularly, described constant current driving control unit comprises: control chip IC, the 4th capacitor C 3, the 9th resistance R 8, the tenth resistance R 9, optocoupler Q1, wherein the positive pole of optocoupler input side receives described PWM dim signal, the minus earth of optocoupler input side, the collector electrode of optocoupler outlet side is through the 9th resistance welding system power supply VCC, the emitter of optocoupler outlet side is connected with the light modulation end DIM of control chip, the tenth resistance and the 4th electric capacity are connected between the light modulation end and ground of control chip, the control end SW of control chip is connected with the control end of switching tube in the DC/DC change-over circuit, the feedback end CS of control chip is connected with the first current acquisition unit, the power end welding system power supply VCC of control chip, the earth terminal GND ground connection of control chip.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.
Claims (4)
1. a LED illumination driving circuit, is characterized in that, comprising:
The DC/DC change-over circuit, it is connected with the LED lamp load, in order to according to the constant current control signal, being LED lamp load output driving current;
The constant current driving control unit, in order to the described constant current control signal of the first sampled signal output according to PWM dim signal and reflection DC/DC change-over circuit inductive current size;
The first current acquisition unit, it is connected with the DC/DC change-over circuit, in order to gather the electric current of inductance in the DC/DC change-over circuit, produces described the first sampled signal;
Signal output unit, in order to basis and the corresponding equivalent duty cycle information of external dimmer control signal, export the PWM dim signal with initial duty cycle, and according to the duty cycle adjustment signal of reflection external dimmer control signal and the second sampled signal comparative result, the duty ratio of described PWM dim signal is adjusted to a predetermined duty cycle by described initial duty cycle, described the second sampled signal reflection LED lamp load size of current.
2. a kind of LED illumination driving circuit according to claim 1, is characterized in that, described DC/DC change-over circuit comprises: the first switching tube, the first inductance, the first diode, the first capacitor C, wherein the source electrode of the first switching tube is connected with the negative pole of the first diode with an end of the first inductance respectively, the other end of the first inductance is connected with the positive pole of LED lamp load with an end of the first electric capacity respectively, the other end of the first electric capacity is connected with the negative pole of LED lamp load, the negative pole of LED lamp load is by the first current acquisition unit ground connection, between the negative pole of LED lamp load and the first current acquisition unit, be provided with the current acquisition end, the current acquisition end is connected with signal output unit, the control end of constant current driving control unit is connected with the grid of the first switching tube, the plus earth of the first diode.
3. a kind of LED illumination driving circuit according to claim 2, is characterized in that, described the first current acquisition unit is the first resistance, and the sampling end of constant current driving unit is connected with the ungrounded end of the first resistance.
4. a kind of LED illumination driving circuit according to claim 1, it is characterized in that, described constant current driving control unit comprises: control chip, the 4th electric capacity, the 9th resistance, the tenth resistance, optocoupler, wherein the positive pole of optocoupler input side receives described PWM dim signal, the minus earth of optocoupler input side, the collector electrode of optocoupler outlet side is through the 9th resistance welding system power supply, the emitter of optocoupler outlet side is connected with the light modulation end of control chip, the tenth resistance and the 4th electric capacity are connected between the light modulation end and ground of control chip, the control end of control chip is connected with the control end of switching tube in the DC/DC change-over circuit, the feedback end of control chip is connected with the first current acquisition unit, the power end welding system power supply of control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203803262U CN203301829U (en) | 2013-06-28 | 2013-06-28 | LED lighting drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203803262U CN203301829U (en) | 2013-06-28 | 2013-06-28 | LED lighting drive circuit |
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| CN203301829U true CN203301829U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203803262U Expired - Fee Related CN203301829U (en) | 2013-06-28 | 2013-06-28 | LED lighting drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107079567A (en) * | 2014-11-05 | 2017-08-18 | 德克萨斯仪器股份有限公司 | Use the control of the lighting device of DC DC converters |
-
2013
- 2013-06-28 CN CN2013203803262U patent/CN203301829U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107079567A (en) * | 2014-11-05 | 2017-08-18 | 德克萨斯仪器股份有限公司 | Use the control of the lighting device of DC DC converters |
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| Date | Code | Title | Description |
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| 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: 20131120 Termination date: 20150628 |
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| EXPY | Termination of patent right or utility model |