CN200969207Y - Back-light source driver for liquid crystal display screen - Google Patents
Back-light source driver for liquid crystal display screen Download PDFInfo
- Publication number
- CN200969207Y CN200969207Y CN 200620079153 CN200620079153U CN200969207Y CN 200969207 Y CN200969207 Y CN 200969207Y CN 200620079153 CN200620079153 CN 200620079153 CN 200620079153 U CN200620079153 U CN 200620079153U CN 200969207 Y CN200969207 Y CN 200969207Y
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- pin
- integrated circuit
- capacitor
- resistance
- magnetic core
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- Expired - Fee Related
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Abstract
The utility model relates to an integrated backlight source driver in LCD, where a cold cathode fluorescent backlight driver and a switch are integrated into a compact circuit. The compact circuit is used for driving the cold cathode fluorescent lamps of LCD TV and LCD backlight source. The utility model is composed of a thick film integrated circuit, three magnetic core transformers, a four lamp output circuit, a controlling silicon, a semiconductor transistor, a semiconductor diode, a resistor, a capacitor, a connector, a common mode inductor, a fuse and a bridge rectifier. The 220V AC passes the bridge rectifier and then is changed into a DC of plus and minus 150V to respectively supply for the switch power supply circuit centered by the integrated circuit IC1, a magnetic core transformer T1 and a magnetic core transformer T2, as well as the cold cathode fluorescent backlight source driving circuit centered by an integrated circuit IC2, a magnetic core transformer T3 and an equalized current circuit M ; The utility model solves the problem that the low power supply efficiency of low switch power voltage (12V DC) to the cold cathode fluorescent backlight source driving circuit. The utility model is also high in power efficiency, small in integration size and balanced in lamp current.
Description
One, technical field
The utility model relates to a kind of cold-cathode fluorescence lamp backlight driver and the incorporate device of Switching Power Supply, is used for LCD and liquid crystal TV set.
Two, background technology
The cold-cathode fluorescence lamp backlight is the main power consumption assembly in LCD and the liquid crystal TV set functional circuit, and the big more power consumption of screen is big more, improves the electric energy efficiency of cold-cathode fluorescence lamp backlight, can reduce Overall Power Consumption effectively.The power supply mode of LCD and liquid crystal TV set is at present: 220VAC obtains 300VDC through rectifying and wave-filtering, reduce voltage (12VDC) through the DC-DC change-over circuit again, supply with other circuit of complete machine and cold-cathode fluorescence lamp backlight driver, supply with cold-cathode fluorescence lamp work through this driver DC-AC inversion boosting.DC (high pressure)-DC (low pressure)-two transfer processes of AC (high pressure) have reduced the complete machine power-efficient.
Three, summary of the invention
The purpose of this utility model provides a kind of integrated design, it passes through backlight driver and Switching Power Supply integrated design, to backlight driver directly carry out high direct voltage power supply (± 150VDC), reduce the conversion links of DC (low pressure)-AC (high pressure), improved the complete machine power-efficient.
The purpose of this utility model is achieved like this: 220VAC obtains ± 150VDC through rectifying and wave-filtering, supplies with IC respectively
1, T1, T2 be Switching Power Supply DC (high pressure)-DC (low pressure) change-over circuit of core and with IC
2, T3, M be backlight driver DC (high pressure)-AC (high pressure) inverter circuit of core.Backlight driver provides High AC voltage for cold-cathode fluorescence lamp, and Switching Power Supply provides low-voltage dc voltage for other circuit of complete machine.
The integrated backlight driver of the LCDs that the utility model provides has improved the complete machine power-efficient, has reduced the volume of circuitry, and pollution-free, noiselessness.
Four, description of drawings
Accompanying drawing 1 is the circuit diagram of the integrated backlight driver of the utility model LCDs.
Wherein: IC
1, IC
2Be width modulation power thick film integrated circuit HL80631G.;
F1, F2 are fuse;
LF is a common mode inductance;
J1-J6 is a connector;
Q1 is a controllable silicon, and Q2 is a transistor;
C1-C28 is a capacitor;
R1-R28 is a resistance;
D0-D16 is a semiconductor diode;
BD is a rectifier bridge;
T1, T2, T3 are the magnetic core transformer;
M is the cold-cathode fluorescence lamp flow equalizing circuit;
Five, embodiment
With reference to accompanying drawing, the integrated backlight driver of the LCDs that the utility model provides comprises width modulation power thick film integrated circuit (IC1, IC2) (its number of patent application of present technique patent applied for is: 200620078896.6), magnetic core transformer (T1, T2, T3), 200620078624.6) and controllable silicon (Q1) transistor (Q2) (its number of patent application of present technique patent applied for is cold-cathode fluorescence lamp flow equalizing circuit (M):, semiconductor diode (D0---D6), resistance (R1---R28), capacitor (C1---C28), connector (J1---J6), common mode inductance (LF), fuse (F1, F2), rectifier bridge (BD).It is characterized in that: 220V AC is through BD rectification and C5-C9 filtering, and R1, R2 obtain ± the 150V DC voltage, supply with respectively with IC1, T1, T2 and be the switching power circuit of core and be the backlight driver circuit of core with IC2, T3, M, described circuit is: C1, C2 series connection back is in parallel with C3, wherein an end is connected with 1 end of LF, the other end is connected with 3 ends of LF, and C1, C2 series connection end is connected with the G end of J1; F1 one end is connected with the L end of J1, and the other end is connected with 1 end of LF; The N end of J1 is connected with 3 ends of LF; 2,4 ends of LF be connected with the two ends of C4 respectively and respectively with two ac input ends (～) of BD.C6 is anodal to connect with the C7 negative pole, C8, C9 series connection, and R1, R2 series connection, the parallel connection of three series connection groups, the series connection point of three series connection groups connects, and the C6 negative pole end is connected with BD (-) end, and the C7 positive terminal is connected with BD (+) end; The C5 both positive and negative polarity is connected with BD (+-) end respectively; 1 pin of IC1 is connected with 18 pin of IC1 through R6, and two ends are connected with 1 pin, 20 pin of IC1 respectively behind D2, the D3 reverse parallel connection; IC
12 pin be connected with 5,6 pin of IC1 through R7; IC
13 pin be connected with 5,6 pin IC1 through C11; IC
14 pin be connected with 5,6 pin of IC1 through R8; IC
15,6 pin be connected with the series connection point of C6, C7; IC
17 pin be empty pin; IC
18 pin be connected with 4 ends of T1 through R10; IC
19 pin, 5 ends of T1,2 ends of T2,11 pin of IC1 join; IC
1(+) end of 10 pin and BD be connected; IC
112 pin be connected with (-) end of 7 ends of T1, BD respectively; IC
113 pin be connected with 6 ends of T1 through R9; IC
114 pin be connected with 2 ends of T1; IC
115 pin be connected with 3 ends of T1; IC
116 pin be connected with 1 end of T1; IC
117 pin be connected with the negative pole of D1, the K utmost point of Q1, the end of C10, the other end of C10 is connected with 5,6 pin of IC1; IC
119 pin be empty pin; R4 connects with R5, and series connection point is connected with the G utmost point of Q1, and the R4 other end is connected with (+) end of BD, and the other end of R5 is connected with the positive pole of C6; R3 one end is connected with the positive pole of D0, and the other end is connected with the G utmost point of Q1; The A utmost point of Q1 is connected with BD (+) end; 3,7 ends of T2 are connected with the positive pole of D4, D5 respectively, and the negative pole of D4, D5 connects; 4,6 ends of T2 are connected with the positive pole of D6, D7 respectively, and the negative pole of D6, D7 connects; 8 ends of T2 are connected with the negative pole of the positive pole of D8 and D0, and the negative pole of D8 is connected with the positive pole of C20; 9,1 pin of T2 is connected with 5,6 pin of IC1 and the negative pole of C20; C12-C15 homopolarity parallel connection, the C12 positive pole is connected with the negative pole of D4, the negative pole of C12 is connected with 5 pin of T2; C16-C19 homopolarity parallel connection, the C16 positive pole is connected with the negative pole of D7, the negative pole of C16 is connected with 5 pin of T2; It is in parallel after R11 connects with R12 with C20, C21; D9 is anodal to be connected with R11, R12 series connection point, and the D9 negative pole is connected with the end of C22, and the other end of C22 is connected with 5,6 pin of IC1, and the negative pole of D9 is connected with 20 pin of IC1 by R13; IC
21 pin be connected with 18 pin of IC2 by R15; IC
22 pin be connected with the series connection point of R21 and R22; IC
23 pin be connected with 5,6 pin of IC2 by C25; IC
24 pin be connected with 5,6 pin of IC2 by R17; IC
25,6 pin be connected with 5 pin of T2; IC
27 pin be empty pin; IC
28 pin be connected with 4 pin of T3 by R19; IC
29,11 pin and T3 5 pin intersection points and be connected with 2 pin of M; IC
2(+) end of 10 pin and BD be connected; IC
2(-) end of 12 pin and BD be connected with 7 pin of T3; IC
213 pin be connected with 6 pin of T3 by R18; IC
214 pin be connected with 2 pin of T3; IC
215 pin be connected with 3 pin of T3; IC
216 pin be connected with 1 pin of T3; IC
217 pin be connected with the negative pole of D4, be connected with 1 pin of J2 by F2; IC
219 pin be connected with 5 pin of J2 by R16; IC
2D10, the DI1 of 20 pin by reverse parallel connection be connected with 1 pin of IC2; R14 one end is connected with 3 pin of J2, and the other end is connected with the positive pole of D12, the negative pole of D12 and IC
220 pin connect; R23 is in parallel with C26, and C26 is anodal to be connected with the C utmost point of Q2, and the C26 negative pole is connected with the E utmost point of Q2; R21 connects with R22, its series connection point and IC
220 pin connect, the end of R21 is connected with the E utmost point of Q2, the end of R22 is connected with the C utmost point of Q2; The C utmost point of Q2 is connected with 5 pin of J2 by R20, and the E utmost point of Q2 is connected with 5,6 pin of IC2; The B utmost point of Q2 is connected with the end of R24, R25, and the other end of R24 is connected with the E utmost point of Q2, and the other end of R25 is connected with the negative pole of D16; The end of C28 is connected with the negative pole of D16, and the other end of C28 is connected with the E utmost point of Q2; The end of the positive pole of D16 and R28 is connected with 5 pin of M, and the other end of R28 is connected with 5,6 pin of IC2; The end of the positive pole of D15 and R27 is connected with 4 pin of M, and the other end of R27 is connected with 5,6 pin of IC2; The negative pole of D15 is connected with the positive pole of D14, and the negative pole of D14 is connected with 20 pin of IC2 by R26; The end of C27 is connected with the positive pole of D14, and the other end is connected with 5,6 pin of IC2; 2 pin and the IC of J2
25,6 pin connect; 3 pin and the IC of M
25,6 pin connect; 1 pin of M is connected with the negative pole of C7; C23, C24 are in parallel with the D13 reversed polarity, the positive pole of C23 and IC
217 pin connect, the negative pole of C23 is connected with 5,6 pin of IC2.
The integrated backlight driver of LCDs provided by the utility model, it is the switching power circuit of core with IC1, T1, T2 and is the backlight driver circuit of core with IC2, T3, M, is integrated combinational circuit.
Claims (2)
1. integrated backlight driver of LCDs, comprise width modulation power thick film integrated circuit (IC1, IC2), magnetic core transformer (T1, T2, T3), cold-cathode fluorescence lamp flow equalizing circuit (M) and controllable silicon (Q1) transistor (Q2), semiconductor diode (D0---D6), resistance (R1---R28), capacitor (C1---C28), connector (J1---J6), common mode inductance (LF), fuse (F1, F2), rectifier bridge (BD), it is characterized in that: 220V AC is through rectifier bridge (BD) rectification and capacitor (C5-C9) filtering, and resistance (R1, R2) obtain ± the 150V DC voltage, supply with respectively with integrated circuit (IC1), magnetic core transformer (T1, T2) be the switching power circuit of core and with integrated circuit (IC2), magnetic core transformer (T3), flow equalizing circuit (M) is the backlight driver circuit of core, the backlight driver circuit, the integrated combination of switching power circuit, described integrated circuit is connected to: capacitor (C1, C2) the series connection back is in parallel with capacitor (C3), wherein an end is connected with 1 end of common mode inductance (LF), the other end is connected capacitor (C1 with 3 ends of common mode inductance (LF), C2) the series connection end is connected with the G end of connector (J1); Fuse (F1) end is connected with the L end of connector (J1), and the other end is connected with 1 end of common mode inductance (LF); The N end of connector (J1) is connected with 3 ends of common mode inductance (LF); 2,4 ends of common mode inductance (LF) are connected with the two ends of capacitor (C4) respectively and are connected with two ac input ends (～) of rectifier bridge (BD) respectively, capacitor (C6) is anodal connects with capacitor (C7) negative pole, capacitor (C8, C9) series connection, resistance (R1, R2) series connection, the parallel connection of three series connection groups, the series connection point of three series connection groups connects, and capacitor (C6) negative pole end is connected with (-) end of rectifier bridge (BD), and capacitor (C7) positive terminal is connected with (+) end of rectifier bridge (BD); Capacitor (C5) both positive and negative polarity is connected with (+-) end of rectifier bridge (BD) respectively; 1 pin of integrated circuit (IC1) is connected through 18 pin of resistance (R6) with integrated circuit (IC1), and two ends are connected with 1 pin, 20 pin of integrated circuit (IC1) respectively behind diode (D2, the D3) reverse parallel connection; Integrated circuit (IC
1) 2 pin be connected with 5,6 pin of integrated circuit (IC1) through resistance (R7); Integrated circuit (IC
1) 3 foot meridian capacitor devices (C11) be connected with 5,6 pin of integrated circuit (IC1); Integrated circuit (IC
1) 4 pin be connected with 5,6 pin of integrated circuit (IC1) through resistance (R8); Integrated circuit (IC
1) 5,6 pin be connected with the series connection point of capacitor (C6, C7); Integrated circuit (IC
1) 7 pin be empty pin; Integrated circuit (IC
1) 8 pin be connected through 4 ends of resistance (R10) with magnetic core transformer (T1); Integrated circuit (IC
1) 5 ends, 2 ends of magnetic core transformer (T2), 11 pin of integrated circuit (IC1) of 9 pin, magnetic core transformer (T1) connect; Integrated circuit (IC
1) (+) end of 10 pin and rectifier bridge (BD) be connected; Integrated circuit (IC
1) 12 pin be connected with (-) end of 7 ends of magnetic core transformer (T1), rectifier bridge (BD) respectively; Integrated circuit (IC
1) 13 pin be connected through 6 ends of resistance (R9) with magnetic core transformer (T1); Integrated circuit (IC
1) 14 pin be connected with 2 ends of magnetic core transformer (T1); Integrated circuit (IC
1) 15 pin be connected with 3 ends of magnetic core transformer (T1); Integrated circuit (IC
1) 16 pin be connected with 1 end of magnetic core transformer (T1); Integrated circuit (IC
1) 17 pin be connected with the negative pole of diode (D1), the K utmost point of controllable silicon (Q1), an end of capacitor (C10), the other end of capacitor (C10) is connected with 5,6 pin of integrated circuit (IC1); Integrated circuit (IC
1) 19 pin be empty pin.Resistance (R4) is connected with resistance (R5), and series connection point is connected with the G utmost point of controllable silicon (Q1), and resistance (R4) other end is connected with (+) end of rectifier bridge (BD), and the other end of resistance (R5) is connected with the positive pole of capacitor (C6); Resistance (R3) end is connected with the positive pole of diode (D0), and the other end is connected with the G utmost point of controllable silicon (Q1); The A utmost point of controllable silicon (Q1) is connected with rectifier bridge (BD) (+) end; 3,7 ends of magnetic core transformer (T2) are connected with the positive pole of diode (D4, D5) respectively, and the negative pole of diode (D4, D5) connects; 4,6 ends of magnetic core transformer (T2) are connected with the positive pole of diode (D6, D7) respectively, and the negative pole of diode (D6, D7) connects; 8 ends of magnetic core transformer (T2) are connected with the positive pole of diode (D8) and the negative pole of diode (D0), and the negative pole of diode (D8) is connected with the positive pole of capacitor (C20); 9,1 pin of magnetic core transformer (T2) is connected with the negative pole of 5,6 pin of integrated circuit (IC1) and capacitor (C20); The parallel connection of capacitor (C12-C15) homopolarity, capacitor (C12) positive pole is connected with the negative pole of diode (D4), the negative pole of capacitor (C12) is connected with 5 pin of magnetic core transformer (T2); The parallel connection of capacitor (C16-C19) homopolarity, capacitor (C16) positive pole is connected with the negative pole of diode (D7), the negative pole of capacitor (C16) is connected with 5 pin of magnetic core transformer (T2); It is in parallel after resistance (R11) is connected with resistance (R12) with capacitor (C20, C21); Diode (D9) is anodal to be connected with resistance (R11, R12) series connection point, diode (D9) negative pole is connected with an end of capacitor (C22), the other end of capacitor (C22) is connected with 5,6 pin of integrated circuit (IC1), and the negative pole of diode (D9) is connected with 20 pin of integrated circuit (IC1) by resistance (R13); Integrated circuit (IC
2) 1 pin be connected with 18 pin of integrated circuit (IC2) by resistance (R15); Integrated circuit (IC
2) 2 pin be connected with the series connection point of resistance (R21) with resistance (R22); Integrated circuit (IC
2) 3 pin be connected with 5,6 pin of integrated circuit (IC2) by capacitor (C25); Integrated circuit (IC
2) 4 pin be connected with 5,6 pin of integrated circuit (IC2) by resistance (R17); Integrated circuit (IC
2) 5,6 pin be connected with 5 pin of magnetic core transformer (T2); Integrated circuit (IC
2) 7 pin be empty pin; Integrated circuit (IC
2) 8 pin be connected with 4 pin of magnetic core transformer (T3) by resistance (R19); Integrated circuit (IC
2) 9,11 pin and magnetic core transformer (T3) 5 pin intersection points and be connected with 2 pin of flow equalizing circuit (M); Integrated circuit (IC
2) (+) end of 10 pin and rectifier bridge (BD) be connected; Integrated circuit (IC
2) 7 pin intersection points of 12 pin, magnetic core transformer (T3) be connected in (-) end of rectifier bridge (BD); Integrated circuit (IC
2) 13 pin be connected with 6 pin of magnetic core transformer (T3) by resistance (R18); Integrated circuit (IC
2) 14 pin be connected with 2 pin of magnetic core transformer (T3); Integrated circuit (IC
2) 15 pin be connected with 3 pin of magnetic core transformer (T3); Integrated circuit (IC
2) 16 pin be connected with 1 pin of magnetic core transformer (T3); Integrated circuit (IC
2) 17 pin be connected with the negative pole of diode (D4), be connected by 1 pin of fuse (F2) with connector (J2); Integrated circuit (IC
2) 19 pin be connected with 5 pin of connector (J2) by resistance (R16); Integrated circuit (IC
2) the diode (D10, D11) of 20 pin by reverse parallel connection be connected with 1 pin of integrated circuit (IC2).Resistance (R14) end is connected with 3 pin of connector (J2), and the other end is connected with the positive pole of diode (D12), the negative pole of diode (D12) and integrated circuit (IC
2) 20 pin connect; Resistance (R23) is in parallel with capacitor (C26), and capacitor (C26) is anodal to be connected with the C utmost point of triode (Q2), and capacitor (C26) negative pole is connected with the E utmost point of triode (Q2); Resistance (R21) is connected with resistance (R22), its series connection point and integrated circuit (IC
2) 20 pin connect, an end of resistance (R21) is connected with the E utmost point of triode (Q2), an end of resistance (R22) is connected with the C utmost point of triode (Q2); The C utmost point of triode (Q2) is connected with 5 pin of connector (J2) by resistance (R20), and the E utmost point of triode (Q2) is connected with 5,6 pin of integrated circuit (IC2); The B utmost point of triode (Q2) is connected with an end of resistance (R24, R25), and the other end of resistance (R24) is connected with the E utmost point of triode (Q2), and the other end of resistance (R25) is connected with the negative pole of diode (D16); One end of capacitor (C28) is connected with the negative pole of diode (D16), and the other end of capacitor (C28) is connected with the E utmost point of triode (Q2); One end of the positive pole of diode (D16) and resistance (R28) is connected with 5 pin of flow equalizing circuit (M), and the other end of resistance (R28) is connected with 5,6 pin of integrated circuit (IC2); One end of the positive pole of diode (D15) and resistance (R27) is connected with 4 pin of flow equalizing circuit (M), and the other end of resistance (R27) is connected with 5,6 pin of integrated circuit (IC2); The negative pole of diode (D15) is connected with the positive pole of diode (D14), and the negative pole of diode (D14) is connected with 20 pin of integrated circuit (IC2) by resistance (R26); One end of capacitor (C27) is connected with the positive pole of diode (D14), and the other end is connected with 5,6 pin of integrated circuit (IC2); 2 pin of connector (J2) and integrated circuit (IC
2) 5,6 pin connect; 3 pin of flow equalizing circuit (M) and integrated circuit (IC
2) 5,6 pin connect; 1 pin of flow equalizing circuit (M) is connected with the negative pole of capacitor (C7); Capacitor (C23, C24) is in parallel with diode (D13) reversed polarity, the positive pole of capacitor (C23) and integrated circuit (IC
2) 17 pin connect, the negative pole of capacitor (C23) is connected with 5,6 pin of integrated circuit (IC2).
2. the integrated backlight driver of LCDs as claimed in claim 1 is characterized in that: be the switching power circuit of core and be that the backlight driver circuit of core is integrated combinational circuit with integrated circuit (IC2), magnetic core transformer (T3), flow equalizing circuit (M) with integrated circuit (IC1), magnetic core transformer (T1, T2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620079153 CN200969207Y (en) | 2006-06-13 | 2006-06-13 | Back-light source driver for liquid crystal display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620079153 CN200969207Y (en) | 2006-06-13 | 2006-06-13 | Back-light source driver for liquid crystal display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200969207Y true CN200969207Y (en) | 2007-10-31 |
Family
ID=38968781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620079153 Expired - Fee Related CN200969207Y (en) | 2006-06-13 | 2006-06-13 | Back-light source driver for liquid crystal display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200969207Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024404A (en) * | 2009-09-17 | 2011-04-20 | 群康科技(深圳)有限公司 | Power switch circuit and power supply system of liquid crystal display |
-
2006
- 2006-06-13 CN CN 200620079153 patent/CN200969207Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024404A (en) * | 2009-09-17 | 2011-04-20 | 群康科技(深圳)有限公司 | Power switch circuit and power supply system of liquid crystal display |
| CN102024404B (en) * | 2009-09-17 | 2013-01-16 | 群康科技(深圳)有限公司 | Power switch circuit and power supply system of liquid crystal display |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071031 |