CN2747807Y - Built-in master mains of wide screen liquid crystal TV set - Google Patents
Built-in master mains of wide screen liquid crystal TV set Download PDFInfo
- Publication number
- CN2747807Y CN2747807Y CN 200420098408 CN200420098408U CN2747807Y CN 2747807 Y CN2747807 Y CN 2747807Y CN 200420098408 CN200420098408 CN 200420098408 CN 200420098408 U CN200420098408 U CN 200420098408U CN 2747807 Y CN2747807 Y CN 2747807Y
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- Expired - Fee Related
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- Television Receiver Circuits (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The utility model provides a built-in main electrical source of a liquid crystal TV provided with a big screen, connecting in other circuits of the TV. The electrical source comprises a rectifying filter circuit, a PCF circuit connected with the rectifying filter circuit, an STR-E1017 chip connected with the PCF circuit, a first transformer connected with the STR-E1017 chip, an STR-X6769 chip connected with the PCF circuit, a second transformer connected with the STR-X6769 chip, a rectification circuit, an STR-A6351 chip connected with the rectification circuit, a third transformer connected with the STR-A6351 chip, a relay connected between the city-electricity and the third transformer. Three transformers output a 12v/14v/5v vice electrical source, a 24v main voltage, and a 5v waiting electrical source through being rectified. The voltage output by the built-in main electrical source of a liquid crystal TV provided with a big screen has stable output voltage, small ripples, good dynamic property, low noise, good EMC property, and low waiting efficiency, and the power factor can reach 99%, the efficiency can reach more than 85%, and the built-in main electrical source of a liquid crystal TV provided with a big screen is suitable to various liquid crystal TV sets with big screens.
Description
Technical field
The utility model belongs to the power circuit technical field of television set, more particularly relates to the design of the built-in main power source of large-screen liquid crystal display television machine.
Background technology
Large-screen liquid crystal display television machine circuit complexity, machine requirement are light, thin, therefore higher to parameter requests such as the power factor of its power supply, efficient, especially very strict to the requirement of its output voltage ripple, to the requirement of noise and Electro Magnetic Compatibility (EMC) also than higher.Particularly for 42 cun liquid crystal TV set power supplys of 300W output, accomplish above some difficulty relatively.Therefore, power supply is one of core technology of large-screen liquid crystal display television machine.
At present, the dynamo-electric source of domestic large-screen liquid crystal display television mainly relies on import or direct introduction of foreign technology.
Summary of the invention
The purpose of this utility model just is to overcome above-mentioned shortcoming and defect, and a kind of built-in main power source of large-screen liquid crystal display television machine is provided.It can satisfy the thickness requirement of LCD TV, and higher complete machine performance, security performance and EMC performance are arranged, and parameter such as power factor, efficient, fin temperature rise, transformer temperature rise and stability, reliability can both be guaranteed.
Television set comprises casing and is installed in circuit in the casing.The decoding digital video chip that circuit comprises tuner, be connected with tuner and sound accompaniment process chip, the electronic switch that is connected with the high definition YUV signal, the Digital Image Processing chip, the LCDs that is connected with the Digital Image Processing chip, the power amplifier that is connected with the sound accompaniment process chip and the loud speaker that are connected with the decoding digital video chip with electronic switch and to the built-in main power source of above-mentioned circuit supply.
In order to achieve the above object, the built-in main power source of the utility model comprises the current rectifying and wave filtering circuit of input AC civil power, the pfc circuit that is connected with current rectifying and wave filtering circuit, the SMA-E1017 chip that is connected with pfc circuit, first transformer that is connected with the SMA-E1017 chip through field effect transistor, the STR-X6769 chip that is connected with pfc circuit, second transformer that is connected with the STR-X6769 chip through diode, the rectification circuit that is connected with electric main, the STR-A6351 chip that is connected with rectification circuit, through the 3rd transformer that diode is connected with the STR-A6351 chip and be connected civil power and the output of the 3rd transformer between relay.First transformer is output as the 12V/14V/5V auxiliary power after rectification, second transformer is output as the 24V principal voltage after rectification, and the 3rd transformer is output as the 5V standby power after rectification.
This power supply adopts three STR-A6351 that agree company to do a standby power separately, cuts off the main power source input with relay during standby.Three SMA-E1017 that agree company have one road PWM output, export auxiliary powers such as 12V/14V/5V after rectification with a transformer, realize the output of 24V/8.2A principal voltage with STR-X6769.
Power factor correction (PFC) circuit is made of two transformers connected in parallel.
This power supply has the output of 5 road voltages.Be respectively: (1) liquid crystal screen backlight lamp power supply output 24V/8.2A.(2) liquid crystal display screen chip power 12V/3.5A.(3) sound equipment amplifier power supply 14V/2A.(4) MCU power supply 5V/2A (5) standby 5V/1A, liquid crystal screen backlight lamp power supply output 24V/8.2A makes of STR-X6769, STR-X6769 is the thick film integrated circuit with the work of quasi-resonance mode, has high efficiency, premium properties such as low noise, power supply starts with soft starting mode, increases power supply reliability, and the voltage output ripple is less than 5%.In order not make the power amplifier jamming pattern, 14V independent grounding and 12V branch are opened, guarantee the stability of 12V.From 12V voltage DC/DC output 5V, ripple is less than 2% with LM2576 in its 5V output, and such Frame Design has guaranteed the stable of each road voltage, and higher reliability is arranged.
This power supply has adopted special standby power to reach the purpose that reduces stand-by power consumption.Standby power is worked always, and it cuts off main power source by under holding state by relay, thereby standby power and CPU work are only arranged, and stand-by power consumption can be dropped to below the 3W
Three E1017 that agree are adopted in the PFC design of this power supply, and this chip has very high reliability, and power factor reaches 99%, adopts critical mode of operation, have advantages such as noise is low, interference is few.
Filter in the current rectifying and wave filtering circuit is by an inductance coil and two pi filters that electric capacity is formed.Connect an electrochemical capacitor between the transformer input of 24V principal voltage and 12V/14V/5V auxiliary power and the ground respectively.
The Conducted Electromagnetic Interference test of this power supply does not add under the situation of filter terminal at complete machine, also has the surplus of 5dB.The major measure that achieves this end is noted having added one by an inductance coil and two pi type filters that electric capacity is formed behind rectifier bridge the EMC design except the wiring of row's plate, plays an important role.Also have this power supply to add a Creative Design, exactly 24V main power source and auxiliary power are powered respectively with 2 electrochemical capacitors, ground wire is got back to pi type filter, She Ji benefit is the phase mutual interference of having eliminated between 2 circuit like this, so both reduced the EMC interference, and also made transformer noise drop to minimum point.
The utility model has satisfied the thickness requirement of liquid crystal TV set, and its output voltage is reliable, stable, and output ripple is little, and the output dynamic property is good, and power factor can reach 99%, and efficient reaches more than 85%, and noise is low, and Electro Magnetic Compatibility is good, and stand-by power consumption is low.The temperature rise of all key chips all is controlled at below 35 ℃, and the transformer temperature rise is below 40 ℃, under the internal high temperature condition of LCD TV, can continue, reliably, stably work.Its complete machine performance, security performance, EMC performance all are guaranteed.It can be widely used in large-screen liquid crystal display television machine 42 cun liquid crystal TV sets that especially 300W exports.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is its circuit theory diagrams.
Embodiment
Embodiment 1.A kind of built-in main power source of large-screen liquid crystal display television machine is as Fig. 1～shown in Figure 2.It is connected in other circuit of television set, the current rectifying and wave filtering circuit (1) that comprises the input AC civil power, the pfc circuit (15) that is connected with current rectifying and wave filtering circuit (1), the SMA-E1017 chip (2) that is connected with pfc circuit (15), first transformer (3) that is connected with SMA-E1017 chip (2) through field effect transistor (16), the STR-X6769 chip (4) that is connected with pfc circuit (15), second transformer (5) that is connected with STR-X6769 chip (4) through diode (17), the rectification circuit that is connected with electric main (6), the STR-A6351 chip (7) that is connected with rectification circuit (6), through the 3rd transformer (8) that diode (18) is connected with STR-A6351 chip (7) and be connected civil power and the output of the 3rd transformer (8) between relay (9), first transformer (3) is output as 12V after diode (19) rectification, export 5V through LM2576 (20) from 12V voltage DC/DC again, after diode (21) rectification, be output as the 14V auxiliary power, second transformer (5) is output as the 24V principal voltage after diode (22) rectification, the 3rd transformer (8) is output as the 5V standby power after diode (23) rectification.Pfc circuit (15) is made of two transformers connected in parallel.
The pi filter that filter in the current rectifying and wave filtering circuit (1) is made up of an inductance coil (10) and two electric capacity (11) and (12).Connect an electrochemical capacitor (13) and (14) between the input of the transformer of 24V principal voltage and 12V/14V/5V auxiliary power (5) and (3) and the ground respectively.
Embodiment 1 output voltage stabilization, ripple is little, and dynamic property is good.Power factor can reach 99%, and efficient reaches more than 85%, and noise is low, and the EMC performance is good, and stand-by power consumption is low.Can be widely used in various large-screen liquid crystal display television machines 42 cun liquid crystal TV sets that especially 300W exports.
Claims (4)
1. the built-in main power source of a large-screen liquid crystal display television machine, it is connected in other circuit of television set, it is characterized in that it comprises the current rectifying and wave filtering circuit of input AC civil power, the pfc circuit that is connected with current rectifying and wave filtering circuit, the SMA-E1017 chip that is connected with pfc circuit, first transformer that is connected with the SMA-E1017 chip through field effect transistor, the STR-X6769 chip that is connected with pfc circuit, second transformer that is connected with the STR-X6769 chip through diode, the rectification circuit that is connected with electric main, the STR-A6351 chip that is connected with rectification circuit, through the 3rd transformer that diode is connected with the STR-A6351 chip and be connected civil power and the output of the 3rd transformer between relay, first transformer is output as the 12V/14V/5V auxiliary power after rectification, second transformer is output as the 24V principal voltage after rectification, the 3rd transformer is output as the 5V standby power after rectification.
2. according to the built-in main power source of the described large-screen liquid crystal display television machine of claim 1, it is characterized in that said pfc circuit is made of two transformers connected in parallel.
3. according to the built-in main power source of the described large-screen liquid crystal display television machine of claim 2, it is characterized in that filter in the said current rectifying and wave filtering circuit is by an inductance coil and two pi filters that electric capacity is formed.
4. according to the built-in main power source of the described large-screen liquid crystal display television machine of claim 3, it is characterized in that connecting an electrochemical capacitor respectively between the transformer input of said 24V principal voltage and 12V/14V/5V auxiliary power and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420098408 CN2747807Y (en) | 2004-11-16 | 2004-11-16 | Built-in master mains of wide screen liquid crystal TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420098408 CN2747807Y (en) | 2004-11-16 | 2004-11-16 | Built-in master mains of wide screen liquid crystal TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2747807Y true CN2747807Y (en) | 2005-12-21 |
Family
ID=35708347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420098408 Expired - Fee Related CN2747807Y (en) | 2004-11-16 | 2004-11-16 | Built-in master mains of wide screen liquid crystal TV set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2747807Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105376508A (en) * | 2015-11-18 | 2016-03-02 | 深圳创维－Rgb电子有限公司 | High power supply for display device, and display device |
-
2004
- 2004-11-16 CN CN 200420098408 patent/CN2747807Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105376508A (en) * | 2015-11-18 | 2016-03-02 | 深圳创维－Rgb电子有限公司 | High power supply for display device, and display device |
| WO2017084291A1 (en) * | 2015-11-18 | 2017-05-26 | 深圳创维－Rgb电子有限公司 | High-power power supply for use in display apparatus, and display apparatus |
| CN105376508B (en) * | 2015-11-18 | 2019-03-12 | 深圳创维－Rgb电子有限公司 | Large power supply and display device for display device |
| US10354570B2 (en) | 2015-11-18 | 2019-07-16 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | High-power power supply for use with display devices and associated display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |