CN1738173A - Power supply circuit and TV set with said power supply circuit - Google Patents
Power supply circuit and TV set with said power supply circuit Download PDFInfo
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- CN1738173A CN1738173A CN 200510044646 CN200510044646A CN1738173A CN 1738173 A CN1738173 A CN 1738173A CN 200510044646 CN200510044646 CN 200510044646 CN 200510044646 A CN200510044646 A CN 200510044646A CN 1738173 A CN1738173 A CN 1738173A
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Abstract
The invention discloses a power circuit and a TV set with said power circuit, which reduces the volume of power by the method of double transformers in parallel and under the condition that confirming the output power of power source, as well as meets the requirement for power height of LCD TV set. The invention keeps the consistency between currents flowing along said two transformers by designing the primary winding of double transformer in series, to reduce the noise effectively and improve the reliability of product. In addition, the secondary winding is designed in parallel to increase the output current and the output power without winding in big diameter, while meeting the demand for outputting high power of the power source of LCD TV set. The invention has simple and effective circuit which solves the height of transformer when the power outputs high power in limited height, with the advantages of high reliability, lower noise and lower EMI interference. So it has wide application in the field of panel display.
Description
Technical field
The present invention relates to a kind of improvement of power circuit, specifically, relate to a kind of ultra-thin power circuit that can be applicable in the large-screen liquid crystal display television machine.
Background technology
At present, the power supply of domestic large-screen liquid crystal display television machine mainly relies on import or direct introduction of foreign technology to produce, because the large-screen liquid crystal display television power requirement is light, thin, power factor and operating efficiency require high, output voltage ripple requires very strict, and disturb the EMI function that higher requirement is also arranged to suppressing noise and anti-electromagnetic wave, particularly in 42 cun liquid crystal television power supplies of 300W output, reach above some require relatively difficulty.This mainly is because the panel TV thickness requirement is strict especially, and the transformer height is a principal contradiction, in order to solve height problem, usually the solution that adopts has two kinds: a kind of is the operating frequency that increases Switching Power Supply, can effectively reduce core volume like this, but the EMI interference that brings and transformer noise, switch chip problem of temperature rise are difficult to solve; Another kind method is to select the alloy magnetic made transformer with high magnetic permeability and high-saturation magnetic induction for use, and then reduce power volume, and still, this type of material price costliness, be used in the raising that can cause production cost in the household appliances, thereby reduced the competitiveness of product in market.Therefore, adopt above-mentioned two kinds of methods all can not fundamentally satisfy the designing requirement of large-screen liquid crystal display television power supply.
Summary of the invention
The present invention is in order to solve the height problem of liquid crystal TV set power supply in the prior art, a kind of novel power circuit is provided, by adopting the method for dual transformer parallel connection, not only efficiently solve the height problem of power supply, but also satisfied the high-power output requirement of liquid crystal TV set, have higher reliability and practicality.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of power circuit and have the television set of described power circuit, comprise high voltage input terminal, transformer and switching circuit, wherein, in described power circuit, include two-way transformer at least, an end connects high voltage input terminal after the former limit windings in series of described transformer, and the other end connects described switching circuit; Described Secondary winding of transformer one end ground connection, the other end connects low-voltage output.
As further qualification to technique scheme; former limit at described transformer is provided with overvoltage crowbar; the sampling winding is arranged on the former limit of transformer in described overvoltage crowbar; one end ground connection; the other end links to each other with the positive pole of a diode through a notch resistance, and the negative pole of described diode connects executive circuit.
As the further qualification again to technique scheme, described transformer includes two-way, and its secondary winding is connected described low-voltage output through the parallel branch of a diode and electric capacity.Described switching circuit then adopts a P channel MOS tube switching circuit to realize, wherein, the source electrode of P channel MOS tube connects the former limit winding of transformer, grounded drain, and grid connects the switch controlling signal output.
Compared with prior art, advantage of the present invention and good effect are: the present invention adopts the method for dual transformer parallel connection guaranteeing to have effectively reduced the volume of power supply under the prerequisite of output power of power supply, has satisfied the requirement of liquid crystal TV set to the power supply height.Become series connection by former limit design of Windings, the electric current that flows through two transformers is consistent, thereby effectively reduces noise, improved reliability of products dual transformer.And, by Secondary winding of transformer is designed to parallel connection, makes winding wire diameter be unlikely to have increased output current under the too thick situation, and then the power output of power supply is raise, satisfied the high-power output requirement of liquid crystal TV set power supply.This circuit construction of electric power is simply effective, has solved the transformer height problem of power supply high-power output when height-limited, has high reliability, low noise, EMI and disturbs advantages such as little, can be widely used in the flat panel display field.
Description of drawings
Fig. 1 is the concrete circuit connection diagram of power circuit among the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
In the liquid crystal TV set power supply, need the output of one road 24V/12A power supply, adopt the single-ended reverse exciting circuit to realize usually, need the bigger transformer of configuration.We adopt two horizontal FERRITE CORE of EER4220 in the present invention, 32mm highly only, and power output can reach 160W, adopts two in parallel realizations, power output just in time satisfies the high-power output requirement of 300W of 42 cun liquid crystal TV set power supplys.Its line map that is connected in parallel is referring to shown in Figure 1.
Among Fig. 1, after the former limit windings in series with two transformer TE005, TE006, an end connects 380V high voltage input terminal INPUT, and the other end connects the metal-oxide-semiconductor switching circuit.Wherein, the source electrode of described P channel MOS tube connects former limit winding, and grounded drain, grid connect switch controlling signal, and control metal-oxide-semiconductor conducting or end under its effect, and then controls former limit winding earth.Former limit windings in series by with two transformer TE005, TE006 is consistent the electric current that flows through two transformer TE005, TE006, has not only reduced noise, and has improved its reliability greatly.Because can there be the making error in two transformers when making,, works long hours and to damage if adopt and joint conference causes the electric current that flows through in the transformer coil big.It is more convenient that series design makes that also PCB sets type, and reduced loop area, reduced the EMI interference.
To export design of Windings and become parallel form, an end ground connection, the other end connects 24V low-voltage output OUTPUT by diode connected in parallel DE511, capacitor C E511 or diode DE512, capacitor C E515.Wherein, diode DE511, DE512 guarantee the circulating direction of electric current, and capacitor C E511, CE515 eliminate the transient voltage spike at described diode DE511, DE512 two ends, guarantee that voltage steadily exports.Because require the electric current of power supply output bigger, adopt design in parallel, make winding wire diameter be unlikely to too thick, guaranteed the consistency that transformer TE005, TE006 make, also make the model of output diode DE511, DE512 select well simultaneously.
In order to make any No. one transformer TE005 or TE006 when the output overvoltage, can both in time be protected, therefore, be provided with overvoltage crowbar on the former limit of each road transformer TE005 or TE006.The former sampling edge design of Windings of two-way transformer TE005 and TE006 is become parallel form, one end ground connection, the other end connects the positive pole of diode DF009 respectively by resistance R E031 or resistance R E037, the negative pole of described diode DF009 connects executive circuit, when sampled voltage VCC surpassed set point, executive circuit was controlled described transformer TE005 and TE006 quits work.Because load is a dynamic load, the voltage VCC that the winding of therefore sampling produces can fluctuate along with the fluctuation of load, so connect on each road sampling winding a resistance R E031 or RE037 reduce fluctuating range, prevent that misoperation from producing.
Foregoing circuit the most important thing is the design and fabrication of transformer when design, because guarantee the consistency of two transformers, so when design former limit winding and secondary winding must be designed to full around, sampling winding for guarantee its consistency also to keep to the side close around, fix.
The present invention has solved the transformer height problem of power supply high-power output when height-limited by adopting above-mentioned simple circuit configuration, has high reliability, low noise, EMI and disturbs advantages such as little.Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (10)
1. power circuit, comprise high voltage input terminal, transformer and switching circuit, it is characterized in that: include two-way transformer at least in described power circuit, an end connects high voltage input terminal after the former limit windings in series of described transformer, and the other end connects described switching circuit; Described Secondary winding of transformer one end ground connection, the other end connects low-voltage output.
2. power circuit according to claim 1; it is characterized in that: the former limit at described transformer is provided with overvoltage crowbar; the sampling winding is arranged on the former limit of transformer in described overvoltage crowbar; one end ground connection; the other end connects the positive pole of a diode, and the negative pole of described diode connects executive circuit.
3. power circuit according to claim 2 is characterized in that: be in series with a notch resistance on the line of described sampling winding and diode cathode.
4. according to claim 1 or 2 or 3 described power circuits, it is characterized in that: described Secondary winding of transformer is connected described low-voltage output through the parallel branch of a diode and electric capacity.
5. power circuit according to claim 1 is characterized in that: described transformer includes two-way; Described switching circuit adopts a P channel MOS tube switching circuit to realize, wherein, the source electrode of P channel MOS tube connects the former limit winding of transformer, grounded drain, and grid connects the switch controlling signal output.
6. television set with described power circuit, comprise high voltage input terminal, transformer and switching circuit, it is characterized in that: in described power circuit, include two-way transformer at least, an end connects high voltage input terminal after the former limit windings in series of described transformer, and the other end connects described switching circuit; Described Secondary winding of transformer one end ground connection, the other end connects low-voltage output.
7. the television set with described power circuit according to claim 6; it is characterized in that: the former limit at described transformer is provided with overvoltage crowbar; the sampling winding is arranged on the former limit of transformer in described overvoltage crowbar; one end ground connection; the other end connects the positive pole of a diode, and the negative pole of described diode connects executive circuit.
8. the television set with described power circuit according to claim 7 is characterized in that: be in series with a notch resistance on the line of described sampling winding and diode cathode.
9. according to claim 6 or 7 or 8 described television sets with described power circuit, it is characterized in that: described Secondary winding of transformer is connected described low-voltage output through the parallel branch of a diode and electric capacity.
10. the television set with described power circuit according to claim 6 is characterized in that: described transformer includes two-way; Described switching circuit adopts a P channel MOS tube switching circuit to realize, wherein, the source electrode of P channel MOS tube connects the former limit winding of transformer, grounded drain, and grid connects the switch controlling signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510044646A CN100593897C (en) | 2005-08-31 | 2005-08-31 | Power supply circuit and TV set with said power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510044646A CN100593897C (en) | 2005-08-31 | 2005-08-31 | Power supply circuit and TV set with said power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1738173A true CN1738173A (en) | 2006-02-22 |
| CN100593897C CN100593897C (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510044646A Active CN100593897C (en) | 2005-08-31 | 2005-08-31 | Power supply circuit and TV set with said power supply circuit |
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| CN (1) | CN100593897C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970500A (en) * | 2012-11-16 | 2013-03-13 | 深圳创维－Rgb电子有限公司 | Liquid crystal display television and power supply circuit thereof |
| CN104350686A (en) * | 2012-06-15 | 2015-02-11 | 高通股份有限公司 | Powerline communication diversity coupling technique |
-
2005
- 2005-08-31 CN CN200510044646A patent/CN100593897C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104350686A (en) * | 2012-06-15 | 2015-02-11 | 高通股份有限公司 | Powerline communication diversity coupling technique |
| US9325374B2 (en) | 2012-06-15 | 2016-04-26 | Qualcomm Incorporated | Powerline communication diversity coupling technique |
| CN104350686B (en) * | 2012-06-15 | 2017-05-24 | 高通股份有限公司 | Powerline communication diversity coupling technique |
| CN102970500A (en) * | 2012-11-16 | 2013-03-13 | 深圳创维－Rgb电子有限公司 | Liquid crystal display television and power supply circuit thereof |
| CN102970500B (en) * | 2012-11-16 | 2015-06-03 | 深圳创维－Rgb电子有限公司 | Liquid crystal display television and power supply circuit thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100593897C (en) | 2010-03-10 |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: HISENSE Co.,Ltd. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE Co.,Ltd. Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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