CN101742186B - Liquid crystal display television (LCD TV) power system - Google Patents
Liquid crystal display television (LCD TV) power system Download PDFInfo
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- CN101742186B CN101742186B CN200910109892A CN200910109892A CN101742186B CN 101742186 B CN101742186 B CN 101742186B CN 200910109892 A CN200910109892 A CN 200910109892A CN 200910109892 A CN200910109892 A CN 200910109892A CN 101742186 B CN101742186 B CN 101742186B
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Abstract
The invention discloses an LCD TV power system, comprising a relay and a standby circuit which are respectively connected with an AC input, a filter circuit connected with the relay, a rectifier circuit connected with the filter circuit, and a power factor corrector circuit connected with the rectifier circuit, wherein the relay is also connected with a low power consumption standby control circuit; and the power factor corrector circuit is also connected with a DC-DC transfer circuit and a DC-AC sine high voltage transfer circuit. The LCD TV power system in the invention can provide corresponding voltage and current for each system of the LCD TV, has ultra-low standby power consumption, high voltage conversion efficiency in normal work, relatively simple system and large power of unit volume output, and fully satisfies rigorous requirements of the LCD TV on power supply.
Description
[technical field]
The present invention relates to technical field of television sets, particularly a kind of liquid crystal display television (LCD TV) power system that can improve the efficient of liquid crystal television power supply greatly.
[background technology]
At present, LCD TV (LCD TV) is by feat of numerous advantages such as large-screen, low thickness and high definitions, the permeability fast lifting on market, and LCD TV more and more receives numerous consumers' welcome, and occupation rate of market constantly raises.Yet when LCD TV market was constantly developed, its electrical source consumption problem was also attracted attention more, and the higher power consumption of LCD TV can directly increase consumer's electricity charge spending, and deviated from mutually with the trend of energy-conserving and environment-protective.Simultaneously; The liquid crystal TV set power requirement is light, thin, high efficiency, and along with the continuous increase of LCD TV size, requires the also corresponding increase of power of power supply; Still adopt the words of the power supply power supply of prior art; The volume of power supply increases, thus have higher requirement for the design of liquid crystal TV power, can the high efficiency voltage transitions when how to design low standby power loss, operate as normal, simple relatively, the unit volume power output of structure greatly, take the lcd power source of advantages such as the PCB area is little; This is the problem that LCD TV manufacturer need solve; Television manufacturer is only continued to optimize its liquid crystal television power supply design, makes it to meet up-to-date efficiency code requirement and other important development trend, could in market competition, get the mastery.
[summary of the invention]
For addressing the above problem, main purpose of the present invention is to provide a kind of liquid crystal display television (LCD TV) power system, can improve the efficient of liquid crystal TV set power supply greatly.
For realizing above-mentioned purpose, technical scheme of the present invention is:
A kind of liquid crystal display television (LCD TV) power system; The circuit of power factor correction that include the relay that connect to exchange input and stand-by circuit, the filter circuit that is connected with relay, the rectification circuit that is connected with filter circuit, is connected with rectification circuit; Said relay also is connected with the low-power consumption standby control circuit, and said circuit of power factor correction is connected with DC-DC translation circuit and the sinusoidal high-voltage conversion circuit of DC-AC.
Compared to prior art; Liquid crystal display television (LCD TV) power system of the present invention can provide correspondent voltage, electric current demand for each system of liquid crystal TV set; Voltage transitions efficient is high when ultralow stand-by power consumption, operate as normal, system is simple relatively, power unit volume output is big, has fully satisfied the harsh requirement of liquid crystal TV set to power supply.
[description of drawings]
Fig. 1 is the theory diagram of liquid crystal display television (LCD TV) power system of the present invention.
Fig. 2 is the circuit diagram of the stand-by circuit of liquid crystal display television (LCD TV) power system of the present invention.
Fig. 3 is the circuit diagram of the low-power consumption standby control circuit of liquid crystal display television (LCD TV) power system of the present invention.
Fig. 4 is the circuit diagram of the APFC of liquid crystal display television (LCD TV) power system of the present invention.
[embodiment]
See also shown in Figure 1ly, the present invention creates liquid crystal display television (LCD TV) power system and includes the relay and stand-by circuit, the filter circuit that is connected with relay and low-power consumption standby control circuit, the rectification circuit that is connected with filter circuit, the circuit of power factor correction that is connected with rectification circuit, the DC-DC translation circuit that is connected with circuit of power factor correction and DC-AC sine high-voltage conversion circuit that connect to exchange input.
See also shown in Figure 2; Stand-by circuit includes pwm chip, transformer T101; Wherein, pwm chip and transformer T101 form single-ended flyback circuit, the 5V direct voltage of the secondary output ST5V of transformer; The auxiliary winding of transformer T101 is exported the direct voltage about 18V through diode D103, and this voltage supplies pwm chip and other chips to use.
See also shown in Figure 3ly, the low-power consumption standby control circuit includes triode, is connected in parallel in the relay and the diode D107 of transistor emitter, is connected in parallel in diode ZD102 and resistance R 107 between transistor base and the ground.Power Vcc is connected with resistance R 100 through the collector electrode that diode D106 is connected to triode between the collector electrode of triode and the base stage.Under the state of standby, cut off other obsolete circuit under holding state through control relay RLY1, can effectively reduce stand-by power consumption.And triode Q102, voltage-stabiliser tube ZD102, resistance R 199, resistance R 107 have formed control circuit and the voltage stabilizing circuit of relay R LY1, and the value through adjustment voltage-stabiliser tube ZD102 can have different output voltage, are used for supplying relay to use.
See also shown in Figure 4; APFC includes filter circuit, first rectification circuit, inductance, metal-oxide-semiconductor, second rectification circuit and the electrochemical capacitor, feedback circuit, the metal-oxide-semiconductor drive circuit APFC that connect successively and works in the HF switch state; Volume is little, in light weight, and is higher than passive power factor correcting circuit efficient.
Rectification circuit, filter circuit and DC-DC translation circuit and DC-AC translation circuit are common prior art, so repeat no more at this.Wherein, DC-DC translation circuit output 12V and 24V direct voltage have protective circuits such as overpower, overvoltage.And the DC-AC translation circuit is used for the driving of LCD TV backlight module fluorescent tube.The light source of present module backlight is cold-cathode fluorescence lamp (CCFL), and cold-cathode fluorescence lamp is a kind of length and thin sealed glass tube, interior filling with inert gas.When applying high voltage to fluorescent tube, gas is produced ultraviolet ray (UV) by ionization.Ultraviolet ray is got on the fluorescent material of coated inner wall it is excited, and sends visible light.In order to maximize the life-span of fluorescent tube, need to adopt AC wave shape to drive CCFL.Any flip-flop can make the end of a part of air accumulation at fluorescent tube, causes irreversible smooth gradient, makes an end of fluorescent tube brighter than the other end.In addition, in order to maximize its efficient (light is exported the ratio with input electric power), need with drive waveform fluorescent tube near sine.Therefore, CCFL needs a DC-AC converter that DC power supply voltage is become the AC wave shape of 40kHz to 80kHz usually, and operating voltage is usually at 500VRMS to 1200VRMS.The DC-AC translation circuit is the working method of full-bridge in this creation, also is to boost from 400V simultaneously, has reduced step-up ratio, has improved the efficient of whole liquid crystal television power supply.
The present invention creates liquid crystal display television (LCD TV) power system can provide correspondent voltage, electric current demand for each system of liquid crystal TV set; High efficiency voltage transitions when having ultralow stand-by power consumption, operate as normal, system are simple relatively, the unit volume power output is big, take advantages such as the PCB area is little; Fully satisfied the harsh requirement of liquid crystal TV set, realized extensive popularization and the application of efficient liquid crystal television power supply in liquid crystal TV set power supply.
Most preferred embodiment described above only is that the present invention is set forth and explains, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variation.
Claims (3)
1. liquid crystal display television (LCD TV) power system; The circuit of power factor correction that include the relay that connect to exchange input and stand-by circuit, the filter circuit that is connected with relay, the rectification circuit that is connected with filter circuit, is connected with rectification circuit; It is characterized in that: said relay also is connected with the low-power consumption standby control circuit, and said circuit of power factor correction is connected with DC-DC translation circuit and the sinusoidal high-voltage conversion circuit of DC-AC; Said stand-by circuit includes pwm chip, transformer (T101); Wherein, Pwm chip and transformer (T101) are formed the single-ended flyback circuit; The 5V direct voltage of the secondary output ST5V of transformer, the auxiliary winding of transformer (T101) is exported the direct voltage about 18V through diode (D103), uses for pwm chip and other chips; Said low-power consumption standby control circuit includes triode, is connected in parallel in the relay and the diode (D107) of transistor emitter, is connected in parallel in diode (ZD102) and resistance (R107) between transistor base and the ground.
2. liquid crystal display television (LCD TV) power system as claimed in claim 1; It is characterized in that: power Vcc is connected to the collector electrode of triode through diode (D106); Be connected with resistance (R100) between the collector electrode of triode and the base stage; Triode (Q102), voltage-stabiliser tube (ZD102), resistance (R199), resistance (R107) have been formed the control circuit and the voltage stabilizing circuit of relay (RLY1); Under the state of standby, cut off other obsolete circuit under holding state through control relay (RLY1), can effectively reduce stand-by power consumption.
3. liquid crystal display television (LCD TV) power system as claimed in claim 2 is characterized in that: said circuit of power factor correction includes filter circuit, first rectification circuit, inductance, metal-oxide-semiconductor, second rectification circuit and electrochemical capacitor, feedback circuit, the metal-oxide-semiconductor drive circuit that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109892A CN101742186B (en) | 2009-11-27 | 2009-11-27 | Liquid crystal display television (LCD TV) power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109892A CN101742186B (en) | 2009-11-27 | 2009-11-27 | Liquid crystal display television (LCD TV) power system |
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| CN101742186A CN101742186A (en) | 2010-06-16 |
| CN101742186B true CN101742186B (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910109892A Expired - Fee Related CN101742186B (en) | 2009-11-27 | 2009-11-27 | Liquid crystal display television (LCD TV) power system |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064719B (en) * | 2010-11-02 | 2013-06-12 | 深圳创维－Rgb电子有限公司 | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device |
| TR201103185A2 (en) | 2011-04-01 | 2012-10-22 | Vestel Elektroni̇k Sanayi̇ Ve Ti̇caret A.Ş. | Switched power supply system with power factor correction. |
| CN103280978A (en) * | 2013-06-28 | 2013-09-04 | 广州视源电子科技股份有限公司 | Low power consumption standby circuit based on feedback signals of load mainboard |
| CN103561221B (en) | 2013-11-15 | 2016-08-17 | 京东方科技集团股份有限公司 | A kind of power supply circuits and display device |
| CN104252840B (en) * | 2014-09-11 | 2017-01-18 | 天津三星电子有限公司 | Driving circuit |
| CN104202890B (en) * | 2014-09-24 | 2016-10-05 | 北京极澈远技术有限公司 | The stand-by circuit of luminaire and the operating circuit of luminaire |
| CN104779801A (en) * | 2015-03-20 | 2015-07-15 | 四川长虹电器股份有限公司 | Multiplexed output low-power-consumption standby switching power supply |
| CN107105178B (en) * | 2017-04-20 | 2019-07-02 | 深圳市华星光电技术有限公司 | TV set power |
| CN113204935B (en) * | 2021-05-08 | 2023-03-24 | 山东英信计算机技术有限公司 | Power supply modular design method and device |
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| US6118584A (en) * | 1995-07-05 | 2000-09-12 | U.S. Philips Corporation | Autostereoscopic display apparatus |
| CN1564584A (en) * | 2004-03-26 | 2005-01-12 | 四川长虹电器股份有限公司 | Method and device for single tube reverse exciting power source for realizing low standby power loss |
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| CN200976642Y (en) * | 2006-12-06 | 2007-11-14 | 深圳创维－Rgb电子有限公司 | LCD TV electrical source |
| CN201142635Y (en) * | 2007-12-18 | 2008-10-29 | 深圳创维－Rgb电子有限公司 | DC-AC inversion boosted circuit |
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2009
- 2009-11-27 CN CN200910109892A patent/CN101742186B/en not_active Expired - Fee Related
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| US6118584A (en) * | 1995-07-05 | 2000-09-12 | U.S. Philips Corporation | Autostereoscopic display apparatus |
| CN1564584A (en) * | 2004-03-26 | 2005-01-12 | 四川长虹电器股份有限公司 | Method and device for single tube reverse exciting power source for realizing low standby power loss |
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| CN101742186A (en) | 2010-06-16 |
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