CN102682707A - Energy saving device of light emitting diode - Google Patents
Energy saving device of light emitting diode Download PDFInfo
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- CN102682707A CN102682707A CN2011100571678A CN201110057167A CN102682707A CN 102682707 A CN102682707 A CN 102682707A CN 2011100571678 A CN2011100571678 A CN 2011100571678A CN 201110057167 A CN201110057167 A CN 201110057167A CN 102682707 A CN102682707 A CN 102682707A
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- light emitting
- emitting diode
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- control
- feedback unit
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Abstract
The invention provides an energy saving device of a light emitting diode, which is applied to control of breakover current and breakover voltage of a light emitting diode array. The energy saving device of the light emitting diode comprises an alternating/direct current converter, a control and feedback unit as well as a resistor. The alternating/direct current converter provides a voltage output; the control and feedback unit is electrically connected with the alternating/direct current converter and the light emitting diode array and used for detecting a breakover current and a breakover voltage, which break over the light emitting diode array; and the resistor is electrically connected with the control and feedback unit as well as a ground end, wherein when the breakover current satisfies the light emitting diode array, the control and feedback unit feeds back a control signal to the alternating/direct current converter, so that the voltage output of the alternating/direct current converter is stabilized to reduce the power supply conversion loss of the alternating/direct current converter.
Description
Technical field
The present invention provides a kind of energy saver, refers to a kind of energy saver of light emitting diode especially.
Background technology
The liquid crystal panel of no autoluminescence character has been applied on the LCD (LCD) like different sizes such as TV, computer screen, mobile phone and PDA(Personal Digital Assistant)s widely; And in order to reach the purpose of video picture, the light source of must arranging in pairs or groups changes so that the corresponding signal of video signal of this liquid crystal panel produces shadow to shine this liquid crystal panel.Because this light source is provided with as for after the liquid crystal panel more; Be to be called as " backlight "; Common on the market backlight mainly can be divided into two kinds at present; One of which provides element for using CCFL with the light source as backlight, and it is two for using light emitting diode with the light source as backlight element to be provided.
Cooperating and consult Figure 1A, is the circuit block diagram of an existing backlight module.
This backlight module 80 is electrically connected on AC power ACV, and this backlight module 80 comprises an AC/DC converter 82, a driver element 84 and at least one CCFL 86.This AC/DC converter 82 is electrically connected on this AC power ACV, this AC power ACV is converted into direct current power supply output; This driver element 84 is electrically connected AC/DC converter 82 and this CCFL 86, and this driver element 84 receives this DC voltage, and uses this CCFL 86 of driving, makes this CCFL 86 produce light source output.
But along with LCD slimming gradually, light emitting diode becomes the light source producing component that a new generation is applied to backlight module.Cooperate and consult Figure 1B, be the circuit block diagram of another existing backlight module.This backlight module 90 comprises an AC/DC converter 92, a DC-DC converter 94 and a light emitting diode matrix 50; Wherein these light emitting diode matrixs 50 are connected in series by a plurality of light emitting diodes 520 and form a LED serial 52; Compose in parallel light emitting diode matrix 50 by a plurality of LED serials again, as shown in Figure 2.
Consult Figure 1B and Fig. 2 again, this AC/DC converter 92 is electrically connected on an AC power ACV, exports this DC-DC converter 94 to convert this AC power ACV into a direct current power supply.This DC-DC converter 94 supplies to boost or be depressurized to a driving voltage VLED that can drive these light emitting diodes 50.These light emitting diodes 50 receive this driving voltage VLED, corresponding simultaneously generation one conducting electric current I LED, and produce light source output.
Yet because these light emitting diodes 50 are in constant voltage mode operation down, this driving voltage VLED is much larger than the required maximum voltage value of these light emitting diode 50 conductings, and this unnecessary voltage extra power loss that is this backlight module 90.
And; Existing use light emitting diode provides a scheduled voltage (as: 12V, 24V) to give this light emitting diode matrix 50 as the backlight module of light source; But the magnitude of voltage that drives these light emitting diode 520 conductings simultaneously might not just equal this scheduled voltage; And when this scheduled voltage during greater than the magnitude of voltage of these light emitting diodes of conducting, unnecessary voltage increases the power supply conversion losses of this AC/DC converter 92.
Again; Because this above-mentioned backlight module 80,90 all must be through the power source conversion of two-period form; I.e. an AC/ DC converter 82,92 collocation one driver element 84 or DC-DC converters 94; And the loss that this AC/DC converter 82,92, this driver element 84 and this DC-DC converter 94 all have conversion efficiency causes the service efficiency of the backlight module 80,90 with two-period form power source conversion effectively to promote.
Summary of the invention
Said in view of prior art, a purpose of the present invention is to provide a kind of light emitting diode energy saver that can reach power saving function effectively.
This light emitting diode energy saver is applied to the conducting electric current of a light emitting diode matrix and the control of forward voltage, and this light emitting diode energy saver is electrically connected on an AC power.
This light emitting diode energy saver comprises an AC/DC converter, a control and feedback unit and a resistor, and this AC/DC converter is electrically connected on this AC power and this light emitting diode matrix, and this AC/DC converter provides voltage output.This control and feedback unit are electrically connected on this AC/DC converter and this light emitting diode matrix, in order to detect conducting in a conducting electric current and a forward voltage of this light emitting diode matrix.This resistor is electrically connected on this control and feedback unit and ground end.Wherein, when this conducting electric current satisfies this light emitting diode matrix, this control and feedback unit feedback one control signal to this AC/DC converter, make the voltage output of stablizing this AC/DC converter, with the loss of the power source conversion that reduces this AC/DC converter.
Described light emitting diode energy saver wherein, also comprises a switch element, is electrically connected on this light emitting diode matrix and this control and feedback unit, and via resistance-grounded system.
Described light emitting diode energy saver, wherein, this switch element is a metal oxide semiconductcor field effect transistor or a two-carrier junction transistor.
Described light emitting diode energy saver, wherein, this AC/DC converter comprises a PWM control module, provide a dimming control signal with the conducting of controlling this switch element with end, make the bright dark variation of generation of this light emitting diode matrix.
This light emitting diode energy saver of the present invention side by side detects forward voltage and the conducting electric current of conducting in this light emitting diode matrix through this control and feedback unit; And be satisfied with this light emitting diode matrix when this conducting electric current and can produce maximum optical intensity when output; This control and feedback unit are seen a control signal off to stablize the output voltage of this AC/DC converter, to reduce power supply conversion losses effectively; And this light emitting diode energy saver only uses single power supply changeover device (AC/DC converter), can avoid the energy loss of existing described two-stage type power source conversion effectively, and then reach energy-conservation effect.
Description of drawings
Figure 1A is the circuit block diagram of a conventional lighting sources module;
Figure 1B is the circuit block diagram of another conventional lighting sources module;
Fig. 2 is the synoptic diagram of light emitting diode matrix;
Fig. 3 is the circuit block diagram of light emitting diode energy saver of the present invention.
Wherein, Reference numeral:
< prior art >
50 light emitting diode matrixs
52 LED serials
520 light emitting diodes
80,90 backlight modules
82,92 AC/DC converters
84 driver elements
86 CCFLs
94 DC-DC converters
The ACV AC power
ILED conducting electric current
The VLED forward voltage
< the present invention >
10 light emitting diode energy savers
12 AC/DC converters
The 122PWM control module
14 control and feedback units
16 switch elements
18 resistors
50 light emitting diode matrixs
52 LED serials
The ACV AC power
ILED conducting electric current
The VLED forward voltage
Embodiment
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Cooperate and consult Fig. 3, be the calcspar of light emitting diode energy saver of the present invention.This light emitting diode energy saver 10 supplies to be connected at least one light emitting diode matrix 50, and this light emitting diode energy saver 10 is applied to regulate a conducting electric current I LED and a forward voltage VLED of this light emitting diode matrix 50.Consult Fig. 2 again, this light emitting diode matrix 50 is composed in series a LED serial 52 by a plurality of light emitting diodes 520, parallelly connected more a plurality of LED serials 52 and the light emitting diode matrix 50 that is in array-like arrangement that forms.
The unidirectional breakover element of low-voltage that this light emitting diode 520 is a kind of current drives; And the luminance brightness of this light emitting diode 520 is along with conducting changes in the conducting electric current I LED of this light emitting diode 520 to some extent; Therefore, providing a stable conducting electric current I LED to give this LED serial 52 can effectively make the luminosity of these light emitting diodes 520 of forming this LED serial 52 reach consistent.
This light emitting diode energy saver 10 provides a stable conducting electric current I LED to give this light emitting diode matrix 50, and this conducting electric current I LED can make this light emitting diode matrix 50 produce maximum luminance; Side by side, this light emitting diode energy saver 10 provides and drives a forward voltage VLED of these light emitting diodes 520 simultaneously, produces to avoid the unnecessary loss of power, and then promotes the efficient of integrated circuit.
Consult Fig. 3 again, this light emitting diode energy saver 10 comprises an AC/DC converter 12, and controls and feedback unit 14, a switch element 16 and a resistor 18.This AC/DC converter 12 is electrically connected on an outside AC power ACV, and this AC power ACV being converted into the direct current power supply that this light emitting diode matrix 50 is suitable for, and this light emitting diode matrix 50 is given in output.This AC/DC converter 12 has a PWM (pulse width modulation) control module 122, and this PWM control module 122 provides the bright dark variation of these light emitting diodes 520 of a dimming control signal to control this light emitting diode matrix 50.
This control and feedback unit 14 are electrically connected on this AC/DC converter 12, this light emitting diode matrix 50, this switch element 16 and this resistor 18; This on-off element 16 is electrically connected on this light emitting diode matrix 50; And via these resistor 18 ground connection; Wherein this switch element 16 be metal oxide semiconductcor field effect transistor (metal-oxide-semiconductor field-effect transistor, MOSFET) or the two-carrier junction transistor (bipolar junction transistor, BJT); But not as limit, other can reach the impartial element that equates effect and all should be contained in the category of the present invention.
This AC/DC converter 12 is passed to this light emitting diode matrix 50 with the forward voltage VLED of this AC power ACV after conversion; If this DC voltage is more than or equal to forward voltage, then these light emitting diode 520 conductings (promptly luminous) of minimum of these light emitting diodes 520 that drive this light emitting diode matrix 50; Side by side, these light emitting diode 520 conductings have a conducting electric current I LED.
This PWM control module 120 of this AC/DC converter 12 produces a dimming control signal simultaneously; This dimming control signal is passed to this on-off element 16 via this control and feedback unit 14; Through conducting (turn-on) or by (turn-off) this on-off element 16, with the bright dark variation of these light emitting diodes 520 of controlling this light emitting diode matrix 50 effectively.
This control and feedback unit 14 side by side detect this forward voltage VLED and this conducting electric current I LED of these AC/DC converter 12 outputs.If this conducting electric current I LED is less than a scheduled current, then this control and feedback unit 14 provide a feedback control signal to promote the forward voltage VLED of its output to order about this AC/DC converter 12, and then improve this conducting electric current I LED.When this conducting electric current I LED equals this scheduled current; This control and feedback unit 14 transmit one and control signal to this AC/DC converter 12; Make this forward voltage VLED that stablizes this AC/DC converter 12; And then stablize this conducting electric current I LED, make this conducting current stabilization make the output of these light emitting diode 520 light stable brightness in certain value.
When this conducting electric current I LED greater than this predetermined conducting electric current; Cause these light emitting diodes 520 to damage easily; Therefore; This control and feedback unit 14 transmit a feedback control signal to this ac/dc converting unit 12 to order about the forward voltage VLED that this AC/DC converter 12 reduces its output, so that the corresponding decline of this conducting electric current I LED damages under high current practice to avoid these light emitting diodes 520.
Comprehensive the above; This light emitting diode energy saver 10 of the present invention side by side detects forward voltage VLED and the conducting electric current I LED of conducting in this light emitting diode matrix 50 through this control and feedback unit 14; And satisfy this light emitting diode matrix 50 in this conducting electric current I LED and can produce maximum optical intensity when output; This control and feedback unit 14 are seen a control signal off to stablize the output forward voltage VLED of this AC/DC converter 12; So, through feeding back this conducting electric current I LED in real time, can reduce unnecessary power supply conversion losses effectively to adjust this forward voltage VLED accordingly; And this light emitting diode energy saver only uses single power supply changeover device (AC/DC converter), can avoid the energy loss of existing described two-stage type power source conversion effectively, and then reach energy-conservation effect.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (4)
1. a light emitting diode energy saver is applied to the conducting electric current of a light emitting diode matrix and the control of forward voltage, and this light emitting diode energy saver is electrically connected on an AC power, it is characterized in that, this light emitting diode energy saver comprises:
One AC/DC converter is electrically connected on this AC power and this light emitting diode matrix, and this AC/DC converter provides voltage output;
One control and feedback unit is electrically connected on this AC/DC converter and this light emitting diode matrix, in order to detect conducting in a conducting electric current and a forward voltage of this light emitting diode matrix;
One resistor is electrically connected on this control and feedback unit and ground end;
Wherein, when this conducting electric current satisfies this light emitting diode matrix, this control and feedback unit feedback one control signal to this AC/DC converter, make the voltage output of stablizing this AC/DC converter, with the loss of the power source conversion that reduces this AC/DC converter.
2. light emitting diode energy saver according to claim 1 is characterized in that, also comprises a switch element, is electrically connected on this light emitting diode matrix and this control and feedback unit, and via resistance-grounded system.
3. light emitting diode energy saver according to claim 2 is characterized in that, this switch element is a metal oxide semiconductcor field effect transistor or a two-carrier junction transistor.
4. light emitting diode energy saver according to claim 2; It is characterized in that; This AC/DC converter comprises a PWM control module, provide a dimming control signal with the conducting of controlling this switch element with end, make the bright dark variation of generation of this light emitting diode matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100571678A CN102682707A (en) | 2011-03-10 | 2011-03-10 | Energy saving device of light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100571678A CN102682707A (en) | 2011-03-10 | 2011-03-10 | Energy saving device of light emitting diode |
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| Publication Number | Publication Date |
|---|---|
| CN102682707A true CN102682707A (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100571678A Pending CN102682707A (en) | 2011-03-10 | 2011-03-10 | Energy saving device of light emitting diode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968965A (en) * | 2012-12-14 | 2013-03-13 | 深圳市华星光电技术有限公司 | Direct type LED (Light-emitting Diode) backlight source |
| US9024532B2 (en) | 2012-12-14 | 2015-05-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Direct type LED backlight and liquid crystal display thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101360374A (en) * | 2007-08-02 | 2009-02-04 | 宇威光电股份有限公司 | Driving circuit for LED unit |
| WO2011021850A2 (en) * | 2009-08-18 | 2011-02-24 | Lg Innotek Co., Ltd. | Led driving circuit |
-
2011
- 2011-03-10 CN CN2011100571678A patent/CN102682707A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101360374A (en) * | 2007-08-02 | 2009-02-04 | 宇威光电股份有限公司 | Driving circuit for LED unit |
| WO2011021850A2 (en) * | 2009-08-18 | 2011-02-24 | Lg Innotek Co., Ltd. | Led driving circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968965A (en) * | 2012-12-14 | 2013-03-13 | 深圳市华星光电技术有限公司 | Direct type LED (Light-emitting Diode) backlight source |
| WO2014089877A1 (en) * | 2012-12-14 | 2014-06-19 | 深圳市华星光电技术有限公司 | Direct-lit led backlight source and liquid crystal display device thereof |
| US9024532B2 (en) | 2012-12-14 | 2015-05-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Direct type LED backlight and liquid crystal display thereof |
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Application publication date: 20120919 |