CN201323679Y - Luminescent diode driving loop - Google Patents
Luminescent diode driving loop Download PDFInfo
- Publication number
- CN201323679Y CN201323679Y CNU2008201807268U CN200820180726U CN201323679Y CN 201323679 Y CN201323679 Y CN 201323679Y CN U2008201807268 U CNU2008201807268 U CN U2008201807268U CN 200820180726 U CN200820180726 U CN 200820180726U CN 201323679 Y CN201323679 Y CN 201323679Y
- Authority
- CN
- China
- Prior art keywords
- emitting diode
- light
- drive
- voltage
- energy storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a luminescent diode driving loop, which changes the structure of a known luminescent diode driving circuit, and utilizes a rectifier diode to convert voltage into negative pressure and output the negative pressure through a loading circuit, output capacitance can supply energy for the luminescent diode independently, and the problem that the luminescent diode flickers due to discontinuous power supply of an alternating current power can be avoided.
Description
Technical field
The utility model is the light-source system about a kind of backlight module, especially a kind of LED driving circuit that is applied to.
Background technology
Fig. 1 is known LED driving circuit 10, and it is to couple a buck-converter 14 by a rectification circuit 12, again by several serial connection light-emitting diodes D
2Export as load.Wherein, rectification circuit 12 comprises a bridge rectifier D
5With a capacitor C
1Buck-converter 14 comprises a transistor component Q
1, a pulse duration module 16, a free-wheel diode D
1, an inductance L
1With a capacitor C
2Its signal effect be with AC power as input signal, transfer AC power to the ripple signal via rectification circuit, and pulse bandwidth module 16 oxide-semiconductor control transistors Q
1Work period.In transistor Q
1During conducting, the ripple signal is to inductance L
1With capacitor C
2Charge, and by ripple signal and inductance L
1With capacitor C
2The energy storage driven for emitting lights diode D that is discharged
2In transistor Q
1When ending, inductance L
1The electric current and the capacitor C that discharge
2, light-emitting diode D
2With free-wheel diode D
1Between form the loop, so that lumination of light emitting diode D to be provided
2
Yet, when AC power is changed at positive negative electricity, can't effectively suppress because of exchanging the input ripple, the situation that the input ripple generation that causes rectification circuit to provide is interrupted, and can't provide light-emitting diode required energy, so light-emitting diode generation scintillation.On the other hand, the electric capacity of known LED driving circuit is necessary for the large bulk capacitance impedance, and this restriction also causes this drive circuit volume to dwindle, and in addition, its conversion efficiency of this kind drive circuit is low, and therefore many problems can't reach the requirement of market institute.
In view of this, the utility model is promptly at the variety of problems that exists in the above-mentioned known technology, changes the LED driving circuit framework, is present in those problems in the prior art with effective solution.
Summary of the invention
Main purpose of the present utility model provides a light-emitting diode and drives the loop, is internal circuit configuration is changed, and to fall the mode of changeing negative pressure, solves the phenomenon of LED flash, and improves its conversion efficiency.
Another purpose of the present utility model provides a light-emitting diode and drives the loop, need not to use jumbo capacitor, drives shared space, loop to dwindle this light-emitting diode.
For achieving the above object, the utility model provides a kind of light-emitting diode and drives the loop, wherein is to comprise an AC power, a rectification circuit, a switch module, a pulse duration module, a rectifier diode, an energy storage inductor, an output capacitance and a load circuit.Wherein, rectification circuit comprises a bridge rectifier input capacitance in parallel, and switch module links first node; The energy storage inductor cross-over connection is in switch module and Section Point; The pulse duration module includes input, drive end, feedback end and earth terminal, and its drive end is to be connected with switch module, and input is connected with first node; The output capacitance cross-over connection is in the earth terminal of Section Point and pulse duration module; The rectifier diode cross-over connection is in the earth terminal of the back of switch module with the pulse duration module; Load circuit comprises a plurality of light-emitting diodes and connects with a control leakage resistance; Wherein the drive end of pulse duration module be connected light-emitting diodes management and control leakage resistance between.
The utility model is by changing the connection relationship of circuit structure originally, make free-wheel diode originally increase the function of rectification, can fall and change the electric current and voltage of electric current and voltage, therefore for bearing, when the input ripple interrupts, still can provide lumination of light emitting diode by an independent cross-pressure.
Beneath by the appended graphic explanation in detail of specific embodiment cooperation, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 is the known luminescence diode drive circuit.
Fig. 2 is embodiment circuit block diagram of the present utility model.
Fig. 3 is detailed circuit schematic of the present utility model.
Among the figure:
10 LED driving circuit, 12 rectification circuits
14 buck-converter, 16 pulse duration modules
20 light-emitting diodes drive loop 22 rectification circuits
24 load circuits, 26 pulse duration modules
28 AC power, 261 inputs
262 drive ends 263 are feedback and are held
264 earth terminals, 30 transistor components
32 rectifier diodes, 34 energy storage inductors
36 output capacitance C
3Input capacitance
D
6Bridge rectifier N
1First node
N
2Section Point
D
1Free-wheel diode L
1Inductance
C
2Electric capacity D
2Light-emitting diode
D
5Bridge rectifier C
1Electric capacity
Q
1Transistor component
Embodiment
Fig. 2 and Fig. 3 are respectively embodiment of the present utility model and make circuit diagram in fact, the utility model provides a kind of light-emitting diode to drive loop 20, it is to comprise an AC power 28, a rectification circuit 22, a switch module 30, a pulse duration module 26, a rectifier diode 32, an energy storage inductor 34, an output capacitance 36 and a load circuit 24, wherein, rectification circuit is by a bridge rectifier D
6With an input capacitance C
3Compose in parallel, and be linked to first node N
1With Section Point N
2Output, this bridge rectifier D
6Be to be connected in series diode in the same way by two groups two to be formed in parallel relatively, it forward is linked to this first node N
1, reverse this Section Point N that is linked to
2This pulse duration module 26 comprises an input 261, a drive end 262, feedbacks end 263 and one earth terminal 264, and its input 261 links the first node N of rectification circuit
1, its drive end 262 is to be connected in switch module (Q
2) 30, its earth terminal 261 is to be linked to load circuit 24 outputs; Energy storage inductor (L
2) 34 cross-over connections are in switch module (Q
2) 30 with the Section Point N of rectification circuit
2Output capacitance (C
4) 36 cross-over connections are in the Section Point N of rectification circuit
2Earth terminal 261 with the pulse duration module; Rectifier diode (D
3) 32 cross-over connections are in switch module (Q
2) 30 with the earth terminal 261 of pulse duration module; Load circuit 24 is by at least one light-emitting diode D
4With a control leakage resistance R
2Series connection is formed, and the back coupling end 263 of pulse duration module is linked to light-emitting diode D
4With control leakage resistance R
2Between node.
It is by bridge rectifier D with AC power 28 input voltages that this light-emitting diode drives loop 20
6With input capacitance C
3Transfer electric current and voltage to, this electric current and voltage is to transmit energy signal with input ripple (47Hz-63Hz) form.And pulse duration module 26 controls one switch module (Q
2) 30, this switch module (Q
2) the 30th, can be a transistor component, its conducting is by this electric current and voltage of decision energy storage inductor (L to coupling whether
2) 34 and one output capacitance (C
4) 36 charge, and utilize a rectifier diode (D
3) 32 originally positive electric current and voltage signal transfer negative electric current and voltage output to, it provides this lumination of light emitting diode D
4
Wherein, in transistor component (Q
2) during 30 conductings, electric current and voltage is to energy storage inductor (L
2) 34 with output capacitance (C
4) 36 chargings and light-emitting diode D is provided
4Driving voltage; In transistor component (Q
2) 30 by the time, be by output capacitance (C
4) 36 energy storage provides driving voltage, makes light-emitting diode D
4Luminous.
Under the situation of side circuit effect, may make ripple be interrupted because the input ripple can't effectively suppress, though therefore at transistor component (Q
2) during 30 conductings, its loop may not have the emergency situations that any electric current and voltage is input into the back segment circuit yet, causes first node N
1With Section Point N
2Its cross-pressure is zero.Since the utility model with electric current and voltage via a rectifier diode (D
3) 32 fall and transfer negative electric current and voltage to, so, be to be independence in the cross-pressure at load circuit two ends and the cross-pressure of rectification circuit, under the situation that this kind ripple is interrupted, be therefore with another cross-pressure driven for emitting lights led lighting D
4, to prevent the discontinuous light-emitting diode D that caused of power signal
4The situation of flicker produces.
Above-described embodiment only is for technological thought of the present utility model and characteristics are described, its purpose is to make the personage who has the knack of this skill can understand content of the present utility model and implements according to this, can not be used to limit claim of the present utility model, promptly the equalization of doing according to the content that the utility model disclosed generally changes or modifies, and must be encompassed in the claim of the present utility model.
Claims (7)
1. a light-emitting diode drives the loop, it is characterized in that:
One AC power provides alternating voltage;
One rectification circuit, in order to transfer this alternating voltage to electric current and voltage, wherein this rectification circuit comprises a first node and a Section Point;
One pulse duration module, it comprises an earth terminal and a drive end;
One switch module is to be connected with this drive end, ends and conducting by this this transistor of pulse duration module controls;
One rectifier diode, be reverse cross-over connection in this first node and this earth terminal, change this current/voltage into negative current/voltage;
One energy storage inductor, its cross-over connection are by this current/voltage this energy storage inductor to be charged in this switch module and this Section Point;
One output capacitance, its cross-over connection are by the energy storage of this current/voltage and this energy storage inductor this output capacitance to be charged in this Section Point and this earth terminal; And
One load circuit is to comprise at least one light-emitting diode, is that the energy storage by this current/voltage, this energy storage inductor and this output capacitance continues to make these lumination of light emitting diode.
2. drive the loop according to the described light-emitting diode of 1 of claim the, it is characterized in that, this rectification circuit is to be the bridge rectifier input capacitance that is connected in parallel.
3. drive the loop according to 2 described light-emitting diodes of claim the, it is characterized in that this bridge rectifier is to be connected in series diode in the same way by two groups two to be formed in parallel relatively, it forward is linked to this first node, reverse this Section Point that is linked to.
4. drive the loop according to 1 described light-emitting diode of claim the, it is characterized in that, this load circuit more comprises a control leakage resistance, and its cross-over connection is in these light-emitting diode one end and this earth terminal.
5. drive the loop according to 1 described light-emitting diode of claim the, it is characterized in that, this pulse duration module more comprises input and feedback end, and this input is connected in this first node, and this feedback end is connected in this light-emitting diode one end, wherein obtain input signal, regain in the feedback termination and award signal, control this switch module in this drive end in this input.
6. drive the loop according to 1 described light-emitting diode of claim the, it is characterized in that this switch module is to be transistor component.
7. drive the loop according to 1 described light-emitting diode of claim the, it is characterized in that, in, when the cross-pressure of this first node and this Section Point reduces to zero, but the cross-pressure of this load circuit is an independently supplying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201807268U CN201323679Y (en) | 2008-12-05 | 2008-12-05 | Luminescent diode driving loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201807268U CN201323679Y (en) | 2008-12-05 | 2008-12-05 | Luminescent diode driving loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201323679Y true CN201323679Y (en) | 2009-10-07 |
Family
ID=41161050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201807268U Expired - Fee Related CN201323679Y (en) | 2008-12-05 | 2008-12-05 | Luminescent diode driving loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201323679Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072418B (en) * | 2009-11-23 | 2012-06-20 | 福华电子股份有限公司 | AC light-emitting diode device with high reliability and long service life |
| CN102612204A (en) * | 2010-12-22 | 2012-07-25 | 梁从主 | Light emitting diode driving circuit |
| CN103348772A (en) * | 2011-01-28 | 2013-10-09 | 首尔半导体株式会社 | Led luminescence apparatus |
| WO2014183228A1 (en) * | 2013-05-13 | 2014-11-20 | 长华电材股份有限公司 | Drive controller operating circuit, drive controller chip and operation method therefor |
-
2008
- 2008-12-05 CN CNU2008201807268U patent/CN201323679Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072418B (en) * | 2009-11-23 | 2012-06-20 | 福华电子股份有限公司 | AC light-emitting diode device with high reliability and long service life |
| CN102612204A (en) * | 2010-12-22 | 2012-07-25 | 梁从主 | Light emitting diode driving circuit |
| CN102612204B (en) * | 2010-12-22 | 2014-05-28 | 梁从主 | Light emitting diode driving circuit |
| CN103348772A (en) * | 2011-01-28 | 2013-10-09 | 首尔半导体株式会社 | Led luminescence apparatus |
| WO2014183228A1 (en) * | 2013-05-13 | 2014-11-20 | 长华电材股份有限公司 | Drive controller operating circuit, drive controller chip and operation method therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20091007 Termination date: 20141205 |
|
| EXPY | Termination of patent right or utility model |