CN101106674B - An implementation method and circuit for low voltage output loop of plasma TV power supply - Google Patents
An implementation method and circuit for low voltage output loop of plasma TV power supply Download PDFInfo
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- CN101106674B CN101106674B CN200710075328XA CN200710075328A CN101106674B CN 101106674 B CN101106674 B CN 101106674B CN 200710075328X A CN200710075328X A CN 200710075328XA CN 200710075328 A CN200710075328 A CN 200710075328A CN 101106674 B CN101106674 B CN 101106674B
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Abstract
The invention discloses an implementation method of low-voltage output loop for plasma TV power supply and the circuit thereof. The circuit thereof includes a main transformer (T1), a first commutation diode (D1), a second commutation diode (D2), a third commutation diode (D3), a fourth commutation diode (D4), a fifth commutation diode (D5), a sixth commutation diode (D6), and at least one autotransformer (T2); wherein the primary side of the main transformer (T1) is connected with the output of a resonance circuit, the C end of the secondary side is connected with the anode of the first commutation diode (D1), the D end is connected with the anode of the second commutation diode (D2), the F end is connected with the anode of the third commutation diode (D3), the G end is connected with the anode of the fourth commutation diode (D4), and the E end is earthed. The invention solves the problem of insufficient transformer base pins due to too many output lines, and furthermore the transformer secondary side has the advantages of convenience for adjusting the turn ratio, low cost and high implementation efficiency.
Description
Technical field
The present invention relates to electric and electronic technical field, relate in particular to the implementation method and the circuit of a kind of PDP (plasm TV) power supply low voltage output loop.
Background technology
PDP (plasm TV) power supply is the heart of whole TV, is responsible for providing the power pack of all screens and signal plate.As shown in Figure 1, its output generally is divided into four parts, standby output (being generally 5V), and (be generally 175～210V), the Va loop feature (is generally 55～85V), LV (low pressure output) loop feature to the Vs loop feature.Wherein the LV loop is the most complicated, and is different with the demand of signal plate according to screen, and its LV loop is also different.Generally by 33V, 24V, 15V, 12V, 9V, 5V, 3.3V forms.Minimum form by three tunnel outputs that (5V), many forms by 7 the tunnel for 12V, 24V.General PDP power supply is all formed by 4 the road or 5 the tunnel.
What the LV loop was at present more common is to adopt traditional circuit of reversed excitation mode, but because the output way of low tension loop is many, so make the problem that will bring the bad and inefficiency of intermodulation characteristic of traditional circuit of reversed excitation.Better solution is to adopt resonant circuit, the efficient height of resonant circuit, and be soft switch circuit.In addition, because the pulsewidth of resonant circuit is 50%, so the intermodulation characteristic of its multichannel output is just relatively good.But also brought following problem simultaneously, the one, the transformer coiling problem that the output way is brought more, because the general skeleton of most of transformers at most also has only 12～16 pins, adopt the resonant circuit can only coiling three tunnel outputs, just cannot coiling if way is many again; Another problem is because each road output voltage is all different, determines so the turn ratio of transformer secondary is just very difficult, regulates inconvenient.
The method of existing solution LV loop problem has following several:
A kind of method is special transformer framework, with regard to having solved owing to the output way not enough problems of bringing of pin, sees Fig. 2 (being output as example with 4 tunnel) so more; But because the way of transformer output is too many, just must bring the bad definite problem of the secondary turn ratio of transformer, and need to bring the increase on the cost separately to the transformer framework die sinking.
Another kind method is that main transformer only goes out 2～3 the tunnel, and other go out with the buck circuit, because main transformer only goes out symmetric winding (such as 12V and 24V), with regard to the bad definite problem of the turn ratio that has solved the transformer secondary, sees Fig. 3 (being output as example with 4 tunnel) like this; But because other a few Lu Yaoyong buck circuit go out, thus cost just than higher, and efficient relatively low (＜94%).
Summary of the invention
The technical problem to be solved in the present invention provides a kind of implementation method and circuit of low voltage output loop of plasm TV power supply.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
A kind of implementation method of low voltage output loop of plasm TV power supply is output as main transformer output with two-way symmetry wherein, and other each roads outputs are exported with autotransformer; Described low voltage output loop comprises main transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the 5th rectifier diode (D5) and the 6th rectifier diode (D6), at least one autotransformer (T2);
The output of the former edge joint resonant circuit of described main transformer (T1), its secondary first tap C end links to each other with the anode of first rectifier diode (D1), second tap D end links to each other with the anode of second rectifier diode (D2), the 4th tap F end links to each other with the anode of the 3rd rectifier diode (D3), the 5th tap G end of main transformer links to each other with the anode of the 4th rectifier diode (D4), and the 3rd tap E holds ground connection; The negative electrode of described first rectifier diode (D1) with connect second output (Vo2) after the negative electrode of the 4th rectifier diode (D4) links to each other, the negative electrode of described second rectifier diode (D2) with connect first output (Vo1) after the negative electrode of the 3rd rectifier diode (D3) links to each other; The former limit of described autotransformer (T2) links to each other with the secondary second tap D, the 4th tap F end or the first tap C, the 5th tap G end of main transformer (T1) respectively, the secondary first tap C end of its autotransformer (T2) links to each other with the anode of the 5th rectifier diode (D5), the 3rd tap E end of autotransformer (T2) links to each other with the anode of the 6th rectifier diode (D6), the second tap D end ground connection of autotransformer (T2); The negative electrode of described the 5th rectifier diode (D5) with connect the 3rd output (Vo3) after the negative electrode of the 6th rectifier diode (D6) links to each other.Wherein, the output voltage of described two-way symmetry output satisfies proportionate relationship.
A kind of low-voltage output circuit of plasm TV power supply, main transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the 5th rectifier diode (D5) and the 6th rectifier diode (D6), at least one autotransformer (T2);
The output of the former edge joint resonant circuit of described main transformer (T1), its secondary C end links to each other with the anode of first rectifier diode (D1), the D end links to each other with the anode of second rectifier diode (D2), the F end links to each other with the anode of the 3rd rectifier diode (D3), the G end links to each other with the anode of the 4th rectifier diode (D4), and E holds ground connection; The negative electrode of described first rectifier diode (D1) with connect second output (Vo2) after the negative electrode of the 4th rectifier diode (D4) links to each other, the negative electrode of described second rectifier diode (D2) with connect first output (Vo1) after the negative electrode of the 3rd rectifier diode (D3) links to each other; The former limit of described autotransformer (T2) links to each other with secondary D, F end or C, the G end of main transformer (T1) respectively, and its secondary C end links to each other with the anode of the 5th rectifier diode (D5), and the E end links to each other with the anode of the 6th rectifier diode (D6), and D holds ground connection; The negative electrode of described the 5th rectifier diode (D5) with connect the 3rd output (Vo3) after the negative electrode of the 6th rectifier diode (D6) links to each other.
Wherein, also comprise first filter capacitor (C1), second filter capacitor (C2), the 3rd filter capacitor (C3); One end ground connection of described first filter capacitor (C1), the other end links to each other with first output (Vo1), one end ground connection of described second filter capacitor (C2), the other end links to each other with second output (Vo2), one end ground connection of described the 3rd filter capacitor (C3), the other end links to each other with the 3rd output (Vo3).
Wherein, also comprise second autotransformer (T3), the 7th rectifier diode (D7), the 8th rectifier diode (D8), the 4th filter capacitor (C4);
The former limit of described second autotransformer (T3) links to each other with secondary D, F end or C, the G end of main transformer (T1) respectively, and its secondary C end links to each other with the anode of the 7th rectifier diode (D7), and the E end links to each other with the anode of the 8th rectifier diode (D8), and D holds ground connection; The negative electrode of described the 7th rectifier diode (D7) with connect the 4th output (Vo4) after the negative electrode of the 8th rectifier diode (D8) links to each other; One end ground connection of described the 4th filter capacitor (C4), the other end links to each other with the 4th output (Vo4).
Wherein, described autotransformer (T2) secondary also comprises F, G, H tap terminals, the 7th rectifier diode (D7), the 8th rectifier diode (D8).
Described autotransformer (T2) secondary F end links to each other with the anode of the 7th rectifier diode (D7), and the H end links to each other with the anode of the 8th rectifier diode (D8), and G holds ground connection; The negative electrode of described the 7th rectifier diode (D7) with connect the 4th output (Vo4) after the negative electrode of the 8th rectifier diode (D8) links to each other.
Wherein, also comprise the 4th filter capacitor (C4); One end ground connection of described the 4th filter capacitor (C4), the other end links to each other with the 4th output (Vo4).
Above technical scheme as can be seen, the present invention has following beneficial effect:
The present invention exports as the transformer master by select the output of two-way symmetry from output, autotransformer output is adopted on other each roads, thereby not only solved the not enough problem of bringing too much owing to the output way of transformer pin, and the transformer secondary turn ratio is easy to adjust, with low cost, and implementation efficiency height (＞97%).
Description of drawings
Fig. 1 is the plasm TV power supply circuit block diagram;
Fig. 2 is the low voltage output loop solution of existing a kind of plasm TV power supply;
Fig. 3 is the low voltage output loop solution of existing another kind of plasm TV power supply;
Fig. 4 is the solution of plasm TV power supply low pressure output of the present invention;
Fig. 5 is the first embodiment circuit diagram;
Fig. 6 is the second embodiment circuit diagram;
Fig. 7 is the 3rd embodiment circuit diagram.
Embodiment
For ease of the present invention is further understood, now reach embodiment in conjunction with the accompanying drawings and describe the present invention.
See also shown in Figure 4ly, comprise main transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the 5th rectifier diode (D5) and the 6th rectifier diode (D6), at least one autotransformer (T2); First filter capacitor (C1), second filter capacitor (C2), the 3rd filter capacitor (C3); Second autotransformer (T2), the 7th rectifier diode (D7), the 8th rectifier diode (D8), the 4th filter capacitor (C4);
The output of the former edge joint resonant circuit of described main transformer (T1), its secondary C end links to each other with the anode of first rectifier diode (D1), the D end links to each other with the anode of second rectifier diode (D2), the F end links to each other with the anode of the 3rd rectifier diode (D3), the G end links to each other with the anode of the 4th rectifier diode (D4), and E holds ground connection; The negative electrode of described first rectifier diode (D1) with connect second output (Vo2) after the negative electrode of the 4th rectifier diode (D4) links to each other, the negative electrode of described second rectifier diode (D2) with connect first output (Vo1) after the negative electrode of the 3rd rectifier diode (D3) links to each other; The former limit of described autotransformer (T2) links to each other with secondary D, F end or C, the G end of main transformer (T1) respectively, and its secondary C end links to each other with the anode of the 5th rectifier diode (D5), and the E end links to each other with the anode of the 6th rectifier diode (D6), and D holds ground connection; The negative electrode of described the 5th rectifier diode (D5) with connect the 3rd output (Vo3) after the negative electrode of the 6th rectifier diode (D6) links to each other.One end ground connection of described first filter capacitor (C1), the other end links to each other with first output (Vo1), one end ground connection of described second filter capacitor (C2), the other end links to each other with second output (Vo2), one end ground connection of described the 3rd filter capacitor (C3), the other end links to each other with the 3rd output (Vo3).
The former limit of described second autotransformer (T2) links to each other with secondary D, F end or C, the G end of main transformer (T1) respectively, and its secondary C end links to each other with the anode of the 7th rectifier diode (D7), and the E end links to each other with the anode of the 8th rectifier diode (D8), and D holds ground connection; The negative electrode of described the 7th rectifier diode (D7) with connect the 4th output (Vo4) after the negative electrode of the 8th rectifier diode (D8) links to each other; One end ground connection of described the 4th filter capacitor (C4), the other end links to each other with the 4th output (Vo4).
Vo1 and Vo2 are the output of two-way symmetry among Fig. 4, and we select them to export as the transformer master.And other two-way are exported by autotransformer.Wherein the input of autotransformer can be selected as required, and IN1 and IN2 can select to be connected D and the F point of main transformer T1, perhaps connects the C and the G point of main transformer.
Like this, the output of Vo3 and Vo4 just only and autotransformer T2, the turn ratio of T3 has relation, and and the turn ratio of main transformer have nothing to do.Main transformer flexible design so not only, and the turn ratio that only need change autotransformer just can design the output voltage of Vo3 and Vo4 easily, and do not influence the main transformer design.In addition, autotransformer can boost, also can step-down, and global design just becomes very flexible like this, and main transformer does not need special transformer framework yet.And the size of autotransformer is the power setting according to Vo3 and Vo4, compared with coming with the buck circuit, saved cost greatly like this.
Can be combined in autotransformer T2 and T3 in the transformer, as shown in Figure 5 as required during actual the use.
Fig. 4 and output voltage V o3 and Vo4 and Vo1 and Vo2 isolation output shown in Figure 5 if do not need to isolate, can connect together their ground wire.
For not needing to isolate output, we can also adopt the mode shown in Fig. 6 (step-down mode) and Fig. 7 (boosting mode) to export, and its equivalent electric circuit is the same.
The low voltage output loop solution of plasm TV power supply of the present invention is fit to other multiple-output electric power equally.
More than the implementation method and the circuit of the low tension loop of a kind of plasm TV power supply provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. the implementation method of the low voltage output loop of a plasm TV power supply is characterized in that, is output as main transformer output with two-way symmetry wherein, and other each roads outputs are exported with autotransformer; Described low voltage output loop comprises main transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the 5th rectifier diode (D5) and the 6th rectifier diode (D6), at least one autotransformer (T2);
The output of the former edge joint resonant circuit of described main transformer (T1), its secondary first tap C end links to each other with the anode of first rectifier diode (D1), second tap D end links to each other with the anode of second rectifier diode (D2), the 4th tap F end links to each other with the anode of the 3rd rectifier diode (D3), the 5th tap G end of main transformer links to each other with the anode of the 4th rectifier diode (D4), and the 3rd tap E holds ground connection; The negative electrode of described first rectifier diode (D1) with connect second output (Vo2) after the negative electrode of the 4th rectifier diode (D4) links to each other, the negative electrode of described second rectifier diode (D2) with connect first output (Vo1) after the negative electrode of the 3rd rectifier diode (D3) links to each other; The former limit of described autotransformer (T2) links to each other with the secondary second tap D, the 4th tap F end or the first tap C, the 5th tap G end of main transformer (T1) respectively, the secondary first tap C end of its autotransformer (T2) links to each other with the anode of the 5th rectifier diode (D5), the 3rd tap E end of autotransformer (T2) links to each other with the anode of the 6th rectifier diode (D6), the second tap D end ground connection of autotransformer (T2); The negative electrode of described the 5th rectifier diode (D5) with connect the 3rd output (Vo3) after the negative electrode of the 6th rectifier diode (D6) links to each other.
2. the implementation method of the low voltage output loop of plasm TV power supply according to claim 1 is characterized in that, the output voltage of described two-way symmetry output satisfies proportionate relationship.
3. plasm TV power supply low-voltage output circuit, it is characterized in that, comprise main transformer (T1), first rectifier diode (D1), second rectifier diode (D2), the 3rd rectifier diode (D3), the 4th rectifier diode (D4), the 5th rectifier diode (D5) and the 6th rectifier diode (D6), at least one autotransformer (T2);
The output of the former edge joint resonant circuit of described main transformer (T1), its secondary first tap C end links to each other with the anode of first rectifier diode (D1), second tap D end links to each other with the anode of second rectifier diode (D2), the 4th tap F end links to each other with the anode of the 3rd rectifier diode (D3), the 5th tap G end of main transformer links to each other with the anode of the 4th rectifier diode (D4), and the 3rd tap E holds ground connection; The negative electrode of described first rectifier diode (D1) with connect second output (Vo2) after the negative electrode of the 4th rectifier diode (D4) links to each other, the negative electrode of described second rectifier diode (D2) with connect first output (Vo1) after the negative electrode of the 3rd rectifier diode (D3) links to each other; The former limit of described autotransformer (T2) links to each other with the secondary second tap D, the 4th tap F end or the first tap C, the 5th tap G end of main transformer (T1) respectively, the secondary first tap C end of its autotransformer (T2) links to each other with the anode of the 5th rectifier diode (D5), the 3rd tap E end of autotransformer (T2) links to each other with the anode of the 6th rectifier diode (D6), the second tap D end ground connection of autotransformer (T2); The negative electrode of described the 5th rectifier diode (D5) with connect the 3rd output (Vo3) after the negative electrode of the 6th rectifier diode (D6) links to each other.
4. as plasm TV power supply low-voltage output circuit as described in the claim 3, it is characterized in that, also comprise first filter capacitor (C1), second filter capacitor (C2), the 3rd filter capacitor (C3); One end ground connection of described first filter capacitor (C1), the other end links to each other with first output (Vo1), one end ground connection of described second filter capacitor (C2), the other end links to each other with second output (Vo2), one end ground connection of described the 3rd filter capacitor (C3), the other end links to each other with the 3rd output (Vo3).
5. as plasm TV power supply low-voltage output circuit as described in claim 3 or 4, it is characterized in that, also comprise second autotransformer (T3), the 7th rectifier diode (D7), the 8th rectifier diode (D8), the 4th filter capacitor (C4);
The former limit of described second autotransformer (T3) links to each other with secondary D, F end or C, the G end of main transformer (T1) respectively, and its secondary C end links to each other with the anode of the 7th rectifier diode (D7), and the E end links to each other with the anode of the 8th rectifier diode (D8), and D holds ground connection; The negative electrode of described the 7th rectifier diode (D7) with connect the 4th output (Vo4) after the negative electrode of the 8th rectifier diode (D8) links to each other; One end ground connection of described the 4th filter capacitor (C4), the other end links to each other with the 4th output (Vo4).
6. as plasm TV power supply low-voltage output circuit as described in the claim 4, it is characterized in that described autotransformer (T2) secondary also comprises F, G, H tap terminals, the 7th rectifier diode (D7), the 8th rectifier diode (D8).
Described autotransformer (T2) secondary F end links to each other with the anode of the 7th rectifier diode (D7), and the H end links to each other with the anode of the 8th rectifier diode (D8), and G holds ground connection; The negative electrode of described the 7th rectifier diode (D7) with connect the 4th output (Vo4) after the negative electrode of the 8th rectifier diode (D8) links to each other.
7. as plasm TV power supply low-voltage output circuit as described in the claim 6, it is characterized in that, also comprise the 4th filter capacitor (C4); One end ground connection of described the 4th filter capacitor (C4), the other end links to each other with the 4th output (Vo4).
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| CN200710075328XA CN101106674B (en) | 2007-07-25 | 2007-07-25 | An implementation method and circuit for low voltage output loop of plasma TV power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2456061A3 (en) * | 2010-11-17 | 2013-03-27 | Nihonmakisen Kogyo Co., Ltd. | Power supply circuit |
| US8773877B2 (en) | 2009-12-28 | 2014-07-08 | Nihonmakisen Kogyo Co., Ltd. | Power supply circuit for LED light circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237836B (en) * | 2014-09-05 | 2018-04-27 | 北京铁道工程机电技术研究所有限公司 | A kind of test device of voltage transformer D.C. magnetic biasing performance |
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| CN88200403U (en) * | 1988-01-22 | 1988-10-19 | 天津市第二变压器厂 | Three-phase stepless voltage regulator |
| CN1229303A (en) * | 1998-08-20 | 1999-09-22 | 深圳市华为电气股份有限公司 | High-efficiency multichannel output power supply |
| CN1389971A (en) * | 2002-07-16 | 2003-01-08 | 艾默生网络能源有限公司 | Dc-to-DC converter with several outputs and its conversion method |
| CN2605581Y (en) * | 2003-03-05 | 2004-03-03 | 深圳市科陆电子科技股份有限公司 | Multichannel isolating voltage output device |
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Patent Citations (4)
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| CN88200403U (en) * | 1988-01-22 | 1988-10-19 | 天津市第二变压器厂 | Three-phase stepless voltage regulator |
| CN1229303A (en) * | 1998-08-20 | 1999-09-22 | 深圳市华为电气股份有限公司 | High-efficiency multichannel output power supply |
| CN1389971A (en) * | 2002-07-16 | 2003-01-08 | 艾默生网络能源有限公司 | Dc-to-DC converter with several outputs and its conversion method |
| CN2605581Y (en) * | 2003-03-05 | 2004-03-03 | 深圳市科陆电子科技股份有限公司 | Multichannel isolating voltage output device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8773877B2 (en) | 2009-12-28 | 2014-07-08 | Nihonmakisen Kogyo Co., Ltd. | Power supply circuit for LED light circuit |
| EP2456061A3 (en) * | 2010-11-17 | 2013-03-27 | Nihonmakisen Kogyo Co., Ltd. | Power supply circuit |
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