CN104918391A - LED constant-voltage and constant-current driving power supply - Google Patents
LED constant-voltage and constant-current driving power supply Download PDFInfo
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- CN104918391A CN104918391A CN201510387178.0A CN201510387178A CN104918391A CN 104918391 A CN104918391 A CN 104918391A CN 201510387178 A CN201510387178 A CN 201510387178A CN 104918391 A CN104918391 A CN 104918391A
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Abstract
The invention provides an LED constant-voltage and constant-current driving power supply comprising a rectifier circuit connected with a mains supply and used to convert alternating-current power into direct-current power, a control circuit connected with the rectifier circuit, a constant-current circuit used to provide constant current for an LED lamp, and a constant-voltage circuit used to provide constant voltage for the LED lamp. When the output current does not reach a set value, the constant-voltage circuit makes the control circuit provide stable voltage for the LED lamp. When the output current reaches the set value, the constant-current circuit and the control circuit are switched on, the constant-current circuit replaces the constant-voltage circuit to make the control circuit reduce the output voltage, the value of the output current no longer rises, and the output current is kept constant. According to the invention, a wire on a copper-clad plate is used as a sampling resistor which replaces a traditional sampling resistor, the advantages of a TL431 precision voltage regulator source such as high precision, high sensitivity, good stability and low cost are fully utilized, and therefore, the cost is reduced.
Description
Technical field
The present invention relates to a kind of LED constant pressure and flow driving power.
Background technology
Along with intensifying of world energy sources crisis, reduce energy consumption, protection of the environment becomes common recognition.LED illumination will replace the low first generation of efficiency and second generation lighting technology.During use, high-power LED illuminating lamp all adopts many LED series connection, the mode that each cluster of lamps, ornamental drives separately.Because the characteristic requirements constant pressure and flow of LED drives, so require the constant voltage constant current power that the power supply of LED all will provide a few road independent simultaneously, and the design of LED lamp is target with energy-conservation, also require that the constant pressure and flow precision of power supply is high, efficiency is high, life-span is long, but the matching of general LED lamp bar and LED drive power when dispatching from the factory all matches, its quantity connecting LED lamp bar to LED drive power is conditional, so a lot of user when in use, as long as LED can be luminous with regard to the unrestricted quantity increasing LED lamp bar, easily LED drive power is burnt when reaching some, cause potential safety hazard, and LED drive power cost common at present still remains high, be unfavorable for reducing use cost.
Summary of the invention
Main purpose of the present invention is to provide a kind of LED constant pressure and flow driving power, it is by unique design, make full use of the height of TL431 type controllable accurate source of stable pressure precisely, high sensitivity, good stability, cheap advantage, because the present invention utilizes the cabling above copper-clad plate as sample resistance without the need to traditional sample resistance, realize the effect reduced costs, and stability of the present invention is strong.
Another object of the present invention is to provide a kind of and provides the driving power of constant current, constant voltage for LED.
Technical scheme provided by the invention is: a kind of LED constant pressure and flow driving power, comprise and to be electrically connected rectification circuit AC energy being converted to direct current energy, the control circuit be connected with this rectification circuit with city, the constant-current circuit of constant current is provided for LED and provides the constant voltage circuit of constant voltage for LED, wherein, this constant-current circuit is connected between this rectification circuit and this constant voltage circuit, and this constant voltage circuit 40 is connected with this control circuit again;
When output current does not reach set point, control this control circuit for LED by this constant voltage circuit and burning voltage is provided;
When the electric current exported reaches set point, this constant-current circuit and this control circuit conducting, replace this constant voltage circuit to control this control circuit by this constant-current circuit and reduce output voltage, the current value of output current no longer rises, constant output current,
This control circuit comprises optocoupler.
This constant-current circuit comprise can with the first controllable accurate source of stable pressure of this optocoupler conducting, to provide for this first controllable accurate source of stable pressure the second controllable accurate source of stable pressure of reference voltage source, for control this first controllable accurate source of stable pressure the first divider resistance, for controlling the second divider resistance of this first controllable accurate source of stable pressure and utilizing copper-clad plate cabling as the sample resistance sampling resistance.
This constant voltage circuit comprises the 3rd controllable accurate source of stable pressure.
When output current does not reach set point, this the first controllable accurate source of stable pressure is subject to the effect of this first divider resistance, the second divider resistance, this the first controllable accurate source of stable pressure is closed, and the optocoupler being controlled this control circuit by the 3rd controllable accurate source of stable pressure of this constant voltage circuit provides stable voltage for LED.
When the electric current exported reaches set point, this sample resistance produces enough pressure drops, and be superimposed with the magnitude of voltage of this second controllable accurate source of stable pressure, impel the optocoupler conducting of this first controllable accurate source of stable pressure and control circuit, now, replace the 3rd controllable accurate source of stable pressure to control this optocoupler by this first controllable accurate source of stable pressure, impel this optocoupler to reduce output voltage, and the current value of output current no longer rises.
This first controllable accurate source of stable pressure, the second controllable accurate source of stable pressure, the 3rd controllable accurate source of stable pressure are TL431 type.
Beneficial effect of the present invention is: the present invention structurally comprises and to be electrically connected rectification circuit AC energy being converted to direct current energy, the control circuit be connected with this rectification circuit with city, to provide the constant-current circuit of constant current for LED and to provide the constant voltage circuit of constant voltage for LED, wherein, this constant-current circuit is connected between this rectification circuit and this constant voltage circuit, and this constant voltage circuit 40 is connected with this control circuit again, when output current does not reach set point, control this control circuit for LED by this constant voltage circuit and burning voltage is provided, when the electric current exported reaches set point, this constant-current circuit and this control circuit conducting, replace this constant voltage circuit to control this control circuit by this constant-current circuit and reduce output voltage, the current value of output current no longer rises, constant output current, it is by unique design, utilize the cabling above copper-clad plate as sample resistance thus replace traditional sample resistance, and the height making full use of TL431 precision voltage regulator is accurate, high sensitivity, good stability, cheap advantage, realize the effect reduced costs.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention.
Embodiment
Be illustrated in figure 1 one of the present invention preferably specific embodiment, a kind of LED constant pressure and flow driving power, comprise and to be electrically connected the rectification circuit 10 AC energy being converted to direct current energy, the control circuit 20 be connected with this rectification circuit 10, the constant-current circuit 30 that constant current is provided for LED with city and to provide the constant voltage circuit 40 of constant voltage for LED, wherein, this constant-current circuit 30 is connected between this rectification circuit 10 and this constant voltage circuit 40, and this constant voltage circuit 40 is connected with this control circuit 20 again.
When output current does not reach set point, control this control circuit 20 for LED by this constant voltage circuit 40 and burning voltage be provided,
When the electric current exported reaches set point, this constant-current circuit 30 and this control circuit 20 conducting, replace this constant voltage circuit 40 to control this control circuit 20 by this constant-current circuit 30 and reduce output voltage, the current value of output current no longer rises, constant output current, plays effect that is constant, stabling current.
This control circuit 20 comprises optocoupler 21.
This constant-current circuit 30 comprise can with the first controllable accurate source of stable pressure 31 of this optocoupler 21 conducting, to provide for this first controllable accurate source of stable pressure 31 second controllable accurate source of stable pressure 32 of reference voltage source, for control this first controllable accurate source of stable pressure 31 the first divider resistance 33, for controlling the second divider resistance 34 of this first controllable accurate source of stable pressure 31 and utilizing copper-clad plate cabling as the sample resistance 35 sampling resistance.
This constant voltage circuit 40 comprises the 3rd controllable accurate source of stable pressure 41.
When output current does not reach set point, this the first controllable accurate source of stable pressure 31 is subject to the effect of this first divider resistance 33, second divider resistance 34, this the first controllable accurate source of stable pressure 31 is closed, and the optocoupler 21 being controlled this control circuit 20 by the 3rd controllable accurate source of stable pressure 41 of this constant voltage circuit 40 provides stable voltage for LED.
When the electric current exported reaches set point, this sample resistance 35 produces enough pressure drops, and be superimposed with the magnitude of voltage of this second controllable accurate source of stable pressure 32, impel optocoupler 21 conducting of this first controllable accurate source of stable pressure 31 and control circuit 20, now, replace the 3rd controllable accurate source of stable pressure 41 to control this optocoupler 21 by this first controllable accurate source of stable pressure 31, impel this optocoupler 21 to reduce output voltage, and the current value of output current no longer rises, thus realize reaching constant and effect that is stabling current.
It is worth mentioning that, this first controllable accurate source of stable pressure 31, second controllable accurate source of stable pressure 32, the 3rd controllable accurate source of stable pressure 41 are TL431 type.This second controllable accurate source of stable pressure 32 is as reference voltage source, and this first controllable accurate source of stable pressure 31, second controllable accurate source of stable pressure 32 is the components and parts of same model specification, and therefore it has positive effect to temperature drift.
What the present invention will realize is, the present invention make full use of the height of TL431 type controllable accurate source of stable pressure precisely, high sensitivity, good stability, cheap advantage, because the present invention utilizes the cabling above copper-clad plate as sample resistance without the need to traditional sample resistance, realize the effect reduced costs, and stability of the present invention is strong.
Embodiments of the invention and accompanying drawing are just in order to show design concept of the present invention, and protection scope of the present invention should not be confined to this embodiment.
By above describe can find out that purpose of design of the present invention can effectively be implemented.The portion shows of embodiment object of the present invention and implement function and structure theme, and comprise other equivalent replacement.
Therefore, right of the present invention forms the equivalence comprising other and implements, concrete right range reference claim.
Claims (7)
1. a LED constant pressure and flow driving power, it is characterized in that: comprise and to be electrically connected rectification circuit AC energy being converted to direct current energy, the control circuit be connected with this rectification circuit with city, the constant-current circuit of constant current is provided for LED and provides the constant voltage circuit of constant voltage for LED, wherein, this constant-current circuit is connected between this rectification circuit and this constant voltage circuit, and this constant voltage circuit 40 is connected with this control circuit again;
When output current does not reach set point, control this control circuit for LED by this constant voltage circuit and burning voltage is provided;
When the electric current exported reaches set point, this constant-current circuit and this control circuit conducting, replace this constant voltage circuit to control this control circuit by this constant-current circuit and reduce output voltage, the current value of output current no longer rises, constant output current.
2. a kind of LED constant pressure and flow driving power as claimed in claim 1, it is characterized in that, this control circuit comprises optocoupler.
3. a kind of LED constant pressure and flow driving power as claimed in claim 2, it is characterized in that, this constant-current circuit comprise can with the first controllable accurate source of stable pressure of this optocoupler conducting, to provide for this first controllable accurate source of stable pressure the second controllable accurate source of stable pressure of reference voltage source, for control this first controllable accurate source of stable pressure the first divider resistance, for controlling the second divider resistance of this first controllable accurate source of stable pressure and utilizing copper-clad plate cabling as the sample resistance sampling resistance.
4. a kind of LED constant pressure and flow driving power as claimed in claim 3, it is characterized in that, this constant voltage circuit comprises the 3rd controllable accurate source of stable pressure.
5. a kind of LED constant pressure and flow driving power as claimed in claim 4, it is characterized in that, when output current does not reach set point, this the first controllable accurate source of stable pressure is subject to the effect of this first divider resistance, the second divider resistance, this the first controllable accurate source of stable pressure is closed, and the optocoupler being controlled this control circuit by the 3rd controllable accurate source of stable pressure of this constant voltage circuit provides stable voltage for LED.
6. a kind of LED constant pressure and flow driving power as claimed in claim 5, it is characterized in that, when the electric current exported reaches set point, this sample resistance produces enough pressure drops, and is superimposed with the magnitude of voltage of this second controllable accurate source of stable pressure, impels the optocoupler conducting of this first controllable accurate source of stable pressure and control circuit, now, replace the 3rd controllable accurate source of stable pressure to control this optocoupler by this first controllable accurate source of stable pressure, impel this optocoupler to reduce output voltage, and the current value of output current no longer rises.
7. a kind of LED constant pressure and flow driving power as claimed in claim 6, is characterized in that, this first controllable accurate source of stable pressure, the second controllable accurate source of stable pressure, the 3rd controllable accurate source of stable pressure are TL431 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387178.0A CN104918391A (en) | 2015-07-06 | 2015-07-06 | LED constant-voltage and constant-current driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387178.0A CN104918391A (en) | 2015-07-06 | 2015-07-06 | LED constant-voltage and constant-current driving power supply |
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| Publication Number | Publication Date |
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| CN104918391A true CN104918391A (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510387178.0A Pending CN104918391A (en) | 2015-07-06 | 2015-07-06 | LED constant-voltage and constant-current driving power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793311A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | The LED Intelligent constant flow constant-voltage driving power sources of tunable optical |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
-
2015
- 2015-07-06 CN CN201510387178.0A patent/CN104918391A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793311A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | The LED Intelligent constant flow constant-voltage driving power sources of tunable optical |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
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