CN202005012U - Multi-path light-emitting diode (LED) current balancing control circuit, LED liquid crystal display screen and television - Google Patents
Multi-path light-emitting diode (LED) current balancing control circuit, LED liquid crystal display screen and television Download PDFInfo
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- CN202005012U CN202005012U CN2010206334003U CN201020633400U CN202005012U CN 202005012 U CN202005012 U CN 202005012U CN 2010206334003 U CN2010206334003 U CN 2010206334003U CN 201020633400 U CN201020633400 U CN 201020633400U CN 202005012 U CN202005012 U CN 202005012U
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Abstract
The utility model provides a multi-path light-emitting diode (LED) current balancing control circuit, an LED liquid crystal display screen and a television. The multi-path LED current balancing control circuit comprises an electromagnetic interference filter, an alternating current (AC) rectifying and filtering circuit, a power factor correction circuit, a DC-DC full/half-bridge topology circuit, a plurality of transformers, a plurality of rectifying and filtering circuits and a plurality of LED series light bars which are connected in series in turn, wherein an input end of the electromagnetic interference filter is connected with an AC power supply; primary windings of the plurality of transformers are connected in series in turn; an input end of the DC-DC full/half-bridge topology circuit is connected with an output end of the power factor correction circuit; two output ends of the DC-DC full/half-bridge topology circuit are connected with two ends of a transformer series circuit; a first end of a secondary winding of each transformer is connected with an input end of the rectifying and filtering circuit; a first output end of the rectifying and filtering circuit is connected with an anode of an LED series light bar; a second end of the secondary winding of each transformer is connected with an input end of another rectifying and filtering circuit; a first output end of the another rectifying and filtering circuit is connected with the anode of an LED series light bar; and cathodes of the plurality of LED series light bars are grounded.
Description
Technical field
The utility model belongs to technical field of television sets, relates in particular to a kind of LED multi-path current balance type control circuit, LED liquid crystal display screen and television set.
Background technology
Liquid crystal TV set has been widely used in the every aspect in our life, and the critical piece of liquid crystal TV set is the LED liquid crystal display screen, the LED assembly that adopts plurality of LEDs to form in the LED liquid crystal display screen.
The technical scheme of existing driving LED is after adopting interchange to change DC converter, adopt one-level DC-DC converter and constant-current control circuit to realize current controlling again to LED, thereby the control LED brightness and the uniformity, this technology major defect is the cost height, efficient is low, to energy-conservation unfavorable.
The utility model content
The purpose of the utility model embodiment is to provide a kind of LED multi-path current balance type control circuit, is intended to solve existing LED multi-path current balance type control circuit and has the cost height, and efficient is low, be unfavorable for problem of energy saving.
The utility model embodiment realizes like this, a kind of LED multi-path current balance type control circuit, described LED multi-path current balance type control circuit comprises Electromagnetic interference filter, AC rectification filter circuit and the circuit of power factor correction of serial connection successively, the input termination AC power of described Electromagnetic interference filter, described LED multi-path current balance type control circuit also comprises:
The full half-bridge topology circuit of DC-DC and a plurality of transformer;
The elementary winding of described a plurality of transformers is connected in series successively, form a transformer series circuit, the output of the described circuit of power factor correction of input termination of the full half-bridge topology circuit of described DC-DC, two outputs of the full half-bridge topology circuit of described DC-DC connect the two ends of described transformer series circuit respectively, and full half-bridge topology circuit of described DC-DC and transformer series circuit form a loop;
Described LED multi-path current balance type control circuit also comprises a plurality of current rectifying and wave filtering circuits and a plurality of LED series lamp bar, the input of the described current rectifying and wave filtering circuit of first termination of described each Secondary winding of transformer, the positive pole of the first output termination, the one LED series lamp bar of described current rectifying and wave filtering circuit, second end of described each Secondary winding of transformer also connects the input of described another current rectifying and wave filtering circuit, the positive pole of the first output termination, the one LED series lamp bar of described another current rectifying and wave filtering circuit, the equal ground connection of negative pole of described a plurality of LED series lamp bars.
In the said structure, described each current rectifying and wave filtering circuit includes first diode, second diode and electric capacity, the negative electrode of the anode of described first diode and second diode is connected to the input of described current rectifying and wave filtering circuit, the anode of the negative electrode of described first diode and second diode connects the positive pole and the negative pole of electric capacity respectively, and the positive pole of described electric capacity and negative pole are respectively first output and second output of current rectifying and wave filtering circuit.
In the said structure, described LED multi-path current balance type control circuit also comprises a sampling resistor R1, and first end of described sampling resistor R1 connects second output of described each current rectifying and wave filtering circuit respectively, the second end ground connection of described sampling resistor R1.
In the said structure, described LED multi-path current balance type control circuit also comprises a feedback circuit, first end of the described sampling resistor R1 of input termination of described feedback circuit, the test side of the full half-bridge topology circuit of the described DC-DC of output termination of described feedback circuit.
In the said structure, described feedback circuit comprises a current sampling comparison circuit and a photoelectrical coupler, first end of the described sampling resistor R1 of input termination of described current sampling comparison circuit, two outputs of described current sampling comparison circuit connect the anode and the negative electrode of the light-emitting diode of described photoelectrical coupler respectively, and the collector and emitter of the triode of described photoelectrical coupler connects the test side of the full half-bridge topology circuit of described DC-DC respectively.
In the said structure, a plurality of LED of described LED series lamp strip adoption connect and constitute.
Another purpose of the utility model embodiment is to provide a kind of LED liquid crystal display screen that comprises above-mentioned LED multi-path current balance type control circuit.
Another purpose of the utility model embodiment is to provide a kind of television set that comprises above-mentioned LED liquid crystal display screen.
Among the utility model embodiment, a plurality of transformer adopting are connected in series, transformer had not only had the power conversion function but also had had the effect of each paths of LEDs electric current of balance, the former scheme of comparing is saved one-level converter and constant-current control circuit, therefore reduced cost, and have characteristics of high efficiency, saved electric energy greatly.
Description of drawings
Fig. 1 is the structure chart of the LED multi-path current balance type control circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 is the structural representation of the LED multi-path current balance type control circuit that provides of the utility model embodiment.
LED multi-path current balance type control circuit comprises Electromagnetic interference filter 100, AC rectification filter circuit 200 and the circuit of power factor correction 300 of serial connection successively, the input termination AC power of Electromagnetic interference filter 100, LED multi-path current balance type control circuit also comprises:
The full half-bridge topology circuit 400 of DC-DC and a plurality of transformer 500;
The elementary winding of a plurality of transformers 500 is connected in series successively, form a transformer series circuit, the output of the input termination circuit of power factor correction 300 of the full half-bridge topology circuit 400 of DC-DC, two outputs of the full half-bridge topology circuit 400 of DC-DC connect the two ends of transformer series circuit respectively, and the full half-bridge topology circuit 400 of DC-DC forms a loop with the transformer series circuit;
LED multi-path current balance type control circuit also comprises a plurality of current rectifying and wave filtering circuits 600 and a plurality of LED series lamp bar 700, the input of the first termination current rectifying and wave filtering circuit 600 of the secondary winding of each transformer 500, the positive pole of the first output termination, the one LED series lamp bar 700 of current rectifying and wave filtering circuit 600, second end of the secondary winding of each transformer 500 also connects the input of another current rectifying and wave filtering circuit 600, the positive pole of the first output termination, the one LED series lamp bar 700 of another current rectifying and wave filtering circuit 600, the equal ground connection of negative pole of a plurality of LED series lamp bars 700.
As the utility model one embodiment, each current rectifying and wave filtering circuit 600 includes first diode, second diode and electric capacity, the negative electrode of the anode of first diode and second diode is connected to the input of current rectifying and wave filtering circuit 600, the anode of the negative electrode of first diode and second diode connects the positive pole and the negative pole of electric capacity respectively, and the positive pole of electric capacity and negative pole are respectively first output and second output of current rectifying and wave filtering circuit 600.
Be example below with Fig. 1, the structure of LED multi-path current balance type control circuit be specifically described:
This LED multi-path current balance type control circuit comprises transformer T1 and transformer Tn, the output terminals A of the full half-bridge topology circuit 400 of the elementary winding first termination DC-DC of transformer T1, elementary winding first end of the elementary winding second termination transformer Tn of transformer T1, the output B of the full half-bridge topology circuit 400 of the elementary winding second termination DC-DC of transformer Tn, secondary winding first end of transformer T1 connects the anode of diode D1 and the negative electrode of diode D3 simultaneously, the anode of the negative electrode of diode D1 and diode D3 connects the positive pole and the negative pole of capacitor C 1 respectively, and the positive pole of capacitor C 1 connects a LED series lamp bar that is made of LEDa1......LEDan series connection; Secondary winding second end of transformer T1 connects the anode of diode D4 and the negative electrode of diode D2 simultaneously, the anode of the negative electrode of diode D4 and diode D2 connects the positive pole and the negative pole of capacitor C 2 respectively, and the positive pole of capacitor C 2 connects a LED series lamp bar that is made of LEDb1......LEDbn series connection; Secondary winding first end of transformer Tn connects the anode of diode D5 and the negative electrode of diode D6 simultaneously, the anode of the negative electrode of diode D5 and diode D6 connects the positive pole and the negative pole of capacitor C 3 respectively, and the positive pole of capacitor C 3 connects a LED series lamp bar that is made of LEDc1......LEDcn series connection; Secondary winding second end of transformer Tn connects the anode of diode D8 and the negative electrode of diode D7 simultaneously, the anode of the negative electrode of diode D8 and diode D7 connects the positive pole and the negative pole of capacitor C 4 respectively, and the positive pole of capacitor C 4 connects a LED series lamp bar that is made of LEDd1......LEDdn series connection.
As the utility model one embodiment, LED multi-path current balance type control circuit also comprises a sampling resistor R1, first end of sampling resistor R1 connects second output of each current rectifying and wave filtering circuit 600 respectively, the second end ground connection of sampling resistor R1, in the present embodiment, first end of sampling resistor R1 connects the negative pole of capacitor C 1, the negative pole of capacitor C 2, the negative pole of capacitor C 3 and the negative pole of capacitor C 4 respectively.
As the utility model one embodiment, LED multi-path current balance type control circuit also comprises a feedback circuit 800, first end of the input termination sampling resistor R1 of feedback circuit 800, the test side of the full half-bridge topology circuit 400 of output termination DC-DC of feedback circuit 800.
As the utility model one embodiment, feedback circuit 800 comprises a current sampling comparison circuit 801 and photoelectrical coupler U1, first end of the input termination sampling resistor R1 of current sampling comparison circuit 801, two outputs of current sampling comparison circuit 801 connect the anode and the negative electrode of the light-emitting diode of photoelectrical coupler U1 respectively, and the collector and emitter of the triode of photoelectrical coupler U1 connects the test side of the full half-bridge topology circuit 400 of DC-DC respectively.
The operation principle of this LED multi-path current balance type control circuit is:
According to the transformer energy law of conservation, law of electromagnetic induction principle, the current ratio and the turn ratio of transformer are inversely proportional, illustrate, IP1/NS1=IS1/NP1 (IP1 among the transformer T1, IS1 is respectively the electric current of elementary winding of transformer T1 and the electric current of secondary winding, NP1, NS1 is respectively the number of turn of elementary winding of transformer T1 and the number of turn of secondary winding), IPn/NSn=ISn/NPn (IPn among the transformer Tn, ISn is respectively the electric current of elementary winding of transformer Tn and the electric current of secondary winding, NPn, NSn is respectively the number of turn of elementary winding of transformer Tn and the number of turn of secondary winding), from the schematic diagram as can be seen, transformer T1 and transformer Tn are series connection, IP1=IPn, and transformer T1 is identical with the first number of turn parameter of transformer Tn, calculate IS1=IS2, therefore, the electric current of each lamp bar reaches balance.
The operation principle process of transformer T1 and transformer Tn is the same, be example now with transformer T1, after full half-bridge topology circuit 400 operate as normal of DC-DC, the electric current I P1 of the first utmost point winding of transformer T1 when A flows to B, diode D1, diode D3 conducting, diode D2, diode D4 ends, and from LEDa1 to LEDan, work by this lamp bar through sampling resistor R1 for the current IS 1 of the inferior utmost point winding of transformer T1; When the converter counteragent, the electric current I P1 of first utmost point winding that is transformer T1 is when B flows to A, diode D2, diode D4 conducting, diode D1, diode D3 ends, and the current IS 1 same process sampling resistor R1 of the inferior utmost point winding of transformer T1 is from LEDb1 to LEDbn, this lamp bar work, capacitor C 1, capacitor C 2 have played filtering and continuous energy respectively.
Gather total current by sampling resistor R1 and feed back to the full half-bridge topology circuit 400 of DC-DC,, get final product by transformer control total current by full half-bridge topology circuit 400 control transformers of DC-DC.
The utility model embodiment also provides a kind of LED liquid crystal display screen that comprises above-mentioned LED multi-path current balance type control circuit.
The utility model embodiment also provides a kind of television set that comprises above-mentioned LED liquid crystal display screen.
Among the utility model embodiment, a plurality of transformer adopting are connected in series, transformer had not only had the power conversion function but also had had the effect of each paths of LEDs electric current of balance, the former scheme of comparing is saved one-level converter and constant-current control circuit, therefore reduced cost, and have characteristics of high efficiency, saved electric energy greatly.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. LED multi-path current balance type control circuit, described LED multi-path current balance type control circuit comprises Electromagnetic interference filter, AC rectification filter circuit and the circuit of power factor correction of serial connection successively, the input termination AC power of described Electromagnetic interference filter, it is characterized in that described LED multi-path current balance type control circuit also comprises:
The full half-bridge topology circuit of DC-DC and a plurality of transformer;
The elementary winding of described a plurality of transformers is connected in series successively, form a transformer series circuit, the output of the described circuit of power factor correction of input termination of the full half-bridge topology circuit of described DC-DC, two outputs of the full half-bridge topology circuit of described DC-DC connect the two ends of described transformer series circuit respectively, and full half-bridge topology circuit of described DC-DC and transformer series circuit form a loop;
Described LED multi-path current balance type control circuit also comprises a plurality of current rectifying and wave filtering circuits and a plurality of LED series lamp bar, the input of the described current rectifying and wave filtering circuit of first termination of described each Secondary winding of transformer, the positive pole of the first output termination, the one LED series lamp bar of described current rectifying and wave filtering circuit, second end of described each Secondary winding of transformer also connects the input of described another current rectifying and wave filtering circuit, the positive pole of the first output termination, the one LED series lamp bar of described another current rectifying and wave filtering circuit, the equal ground connection of negative pole of described a plurality of LED series lamp bars.
2. LED multi-path current balance type control circuit as claimed in claim 1, it is characterized in that, described each current rectifying and wave filtering circuit includes first diode, second diode and electric capacity, the negative electrode of the anode of described first diode and second diode is connected to the input of described current rectifying and wave filtering circuit, the anode of the negative electrode of described first diode and second diode connects the positive pole and the negative pole of electric capacity respectively, and the positive pole of described electric capacity and negative pole are respectively first output and second output of current rectifying and wave filtering circuit.
3. LED multi-path current balance type control circuit as claimed in claim 1, it is characterized in that, described LED multi-path current balance type control circuit also comprises a sampling resistor R1, first end of described sampling resistor R1 connects second output of described each current rectifying and wave filtering circuit respectively, the second end ground connection of described sampling resistor R1.
4. LED multi-path current balance type control circuit as claimed in claim 3, it is characterized in that, described LED multi-path current balance type control circuit also comprises a feedback circuit, first end of the described sampling resistor R1 of input termination of described feedback circuit, the test side of the full half-bridge topology circuit of the described DC-DC of output termination of described feedback circuit.
5. LED multi-path current balance type control circuit as claimed in claim 4, it is characterized in that, described feedback circuit comprises a current sampling comparison circuit and a photoelectrical coupler, first end of the described sampling resistor R1 of input termination of described current sampling comparison circuit, two outputs of described current sampling comparison circuit connect the anode and the negative electrode of the light-emitting diode of described photoelectrical coupler respectively, and the collector and emitter of the triode of described photoelectrical coupler connects the test side of the full half-bridge topology circuit of described DC-DC respectively.
6. LED multi-path current balance type control circuit as claimed in claim 1 is characterized in that, a plurality of LED of described LED series lamp strip adoption connect and constitute.
7. a LED liquid crystal display screen is characterized in that, described LED liquid crystal display screen comprises each described LED multi-path current balance type control circuit as claim 1-6.
8. a television set is characterized in that, described television set comprises LED liquid crystal display screen as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206334003U CN202005012U (en) | 2010-11-30 | 2010-11-30 | Multi-path light-emitting diode (LED) current balancing control circuit, LED liquid crystal display screen and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206334003U CN202005012U (en) | 2010-11-30 | 2010-11-30 | Multi-path light-emitting diode (LED) current balancing control circuit, LED liquid crystal display screen and television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202005012U true CN202005012U (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206334003U Expired - Lifetime CN202005012U (en) | 2010-11-30 | 2010-11-30 | Multi-path light-emitting diode (LED) current balancing control circuit, LED liquid crystal display screen and television |
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|---|---|
| CN (1) | CN202005012U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102833912A (en) * | 2012-07-30 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED (light emitting diode) power circuit, backlight module and liquid crystal display device |
| CN113179568A (en) * | 2021-04-09 | 2021-07-27 | 深圳市立创普电源技术有限公司 | Multi-output constant-current control circuit and driving power supply |
-
2010
- 2010-11-30 CN CN2010206334003U patent/CN202005012U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102833912A (en) * | 2012-07-30 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED (light emitting diode) power circuit, backlight module and liquid crystal display device |
| CN113179568A (en) * | 2021-04-09 | 2021-07-27 | 深圳市立创普电源技术有限公司 | Multi-output constant-current control circuit and driving power supply |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111005 |
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| CX01 | Expiry of patent term |