TWM282278U - Circuit applied to uniform the current in light tubes - Google Patents

Description

M282278 8. Description of the new type: [Technical field to which the new type belongs] Kind of 4; application circuit, especially a connection relationship between a plurality of transformers and a plurality of lamps, for adjusting the current balance between the plurality of lamps The circuit.

[Previous technology] Due to technological progress and consumer demand, the size of LCD panels has continued to increase, so that a single lamp can no longer meet its lighting requirements, so it is necessary to use two or more; k 7. In order to ensure the uniform brightness of the LQ panel, the current of each tube must be adjusted at any time to make the amount of current flowing through each tube equal. 'But because of various reasons such as the cathode fluorescent tube (GGFL) being highly unstable and having a negative impedance characteristic', it is difficult to maintain the tube impedance uniformity, causing changes in each lamp and preventing the current from reaching ㈣. The currents between the lamps are not the same. In addition to the uneven brightness, lamps with too much current will shorten the life expectancy, making the aging rates (AgingRate) between the lamps different. ， 第 ； ： The diagram is the conventional two using a differential ballast to adjust two =: of: early circuit diagram. It includes a transformer 12 with a first coil and a coil 122. One end of the first coil 121 is connected to an AC power source 10, and the other is a remote pole. A net total m is known to be connected to a younger, a lamp officer 141, and The other end of the B-th 41 is connected to a reference potential G. And a first-coil 122, one end of which is connected to Xi Liu Fa Lei, β μ σ a ▲ Κ Π, Gua power supply 10, and the other end is connected to the other end of the second lamp tube 142, shi hai To a reference. As described above, the AC power source 10 is provided through a transformer 121 coil-a solid 100 ... 丄 i mouth to provide a differential ballast, used to respectively U, 12 is used for the first lamp tube 141 and the second lamp tube 142 5 M282278 to use the effect of balancing the current flowing through the first lamp tube 142 and the second lamp tube 142. In conjunction with the first diagram, please refer to the second diagram, which is a schematic diagram of the equivalent magnetic circuit of the transformer 12 in the first diagram. As shown in the second figure, the magnetic core 120 series includes two side posts A1 and A2, and two shoulder posts A3 and A4. When the currents 11 and 12 are the same, the currents flowing through the first coil 121 and the second coil 122 are also equal, and the magnetomotive force generated by the current Π in the first coil 121 and the magnetism generated by the current 12 in the second coil 丨 22 The momentum is also equal, that is, the magnetomotive force in the side pillar A1 • and the magnetomotive force in the side pillar A2 cancel each other, so there is no magnetic flux in the shoulder pillar A3 and the shoulder pillar A4. At the same time, in the side column a 1 and the side column a, through Φ1 and φ2 can complete the loop through the air gap on the outside, but because the magnetic resistance of the air gap is high, the inductance effect caused by this loop can generally be ignored. "In conjunction with the first picture, please refer to the third picture, which is a schematic diagram of the equivalent magnetic circuit of the first picture and the connection of the lamp tube. When the current 11 of the first lamp tube 141 and the current 12 of the second lamp officer 142 are different, Then the magnetomotive force generated by the current π on the first coil 121 and the magnetomotive force generated by the current 12 on the second coil 122 are different, that is, the magnetomotive forces in the side pillars A1 and A2 are not the same. Equal, the difference between the two is applied to the low-resistance circuit formed by the side posts A1, side posts A2, shoulder posts A3, and shoulder posts A4 / jin to generate a large amount of magnetic flux ①, the magnetic flux ① cut "the coil 121 and The second coil 122 induces a correction voltage Λν between its ends, and the electric voltage ^ of the correction voltage Δν and the current 12 of the second lamp tube 142 return to equilibrium and equal 5. It is a simple schematic diagram of the conventional method of using a differential ballast to regulate a complex and & current. The simple circuit shown in the fourth figure includes 6 M282278 including a plurality of coils having a first coil 〖21 and a second coil〗 Transformer of 22 12 ° One end of the first coil 121 is connected to a reference potential g, and the other-do n’t connect a The first lamp tube 141 and the other of the first lamp tubes i4i are connected to a parent current source. And the second coils 1 have their vertical ends connected to the reference potential G, and the other ends are respectively connected to a first potential. The two lamps 142, and the other ends of the second lamps 142 are connected to the AC power source 10. As described above, the AC power source 10 passes through the first coil 121 and the second coil 122 of the transformers J 2 Differential ballasts are formed to provide stable currents U, 12 to the first and second lamps 141 and 142, respectively, so that the first and second lamps 141 and 142 flow through them. The current reaches the effect of balancing, it is only limited between the two lamps and cannot have the effect of current balance between the other lamps. / Consider the fifth picture, which is another kind of conventional use of a differential ballast to adjust the lamp A simple circuit diagram of the official current. As shown in the fifth figure, the two lamps are taken as an example. The two lamps 31 and 32 are connected in parallel, and the high voltage ends of the two lamps M and the transmissive-differential ballast element 39 are used. And connected to the-AC power / the differential ballast element 39 can generate-correction voltage, this-correction voltage system The mismatch between the lamp currents 13 and 132 is proportional and can be superimposed to a common drive voltage. Therefore, after the corrected driving voltage, the lamp currents 13 and 132 can be appropriately adjusted to evenly distribute. Although this ^ The circuit can ensure that the currents of the two lamps are equal, but their structure—generally includes a specific shape of the core and the coil frame, and these cores and coil frames are not generally standard products, so that in terms of material cost and cost control All of them are inconvenient. Please refer to the sixth figure, which is another simple circuit diagram of the conventional use of a differential ballast to adjust the current of a plurality of lamps. As shown in the sixth figure, a plurality of differential M282278 dynamic ballast elements (Tl, T2, Tq Τ / Ι π connection to connect to-AC: T ηΤ5: T6, T7) is shunted to the tree-like current (m layered shunting principle will not balance this, its operation principle is the same as the fifth ® I wo n’t go into details here. HI, you point, the circuit for adjusting the lamp current is known-there is a common lack of two and two, and when there are multiple lamps, it can only be applied to two lamps. 'And it is applicable to an odd number of lamps, And the number of lamps on the sixth square. Sense ... Same and can only be applied to the secondary [New Content] / This' this creation — a kind of lamp current sharing circuit, the main purpose of which is: two / multiple transformers with primary winding and secondary winding, The change == person D and its-end is connected to the-tube respectively, and the other end is connected to the-power source through the adjacent transformer main winding; by this winding connection method, the source can be provided through these transformers 11 The same king makes current to these lamps. In addition, this embodiment of the lamp current sharing application circuit is a first transformer with a primary winding and a primary winding and a primary transformer with a primary winding and a secondary winding. The second transformer is connected to one end of the primary winding, which is connected to a power source, the other end is connected to the first lamp tube through the # 人 凡, ", and one end of the second winding is connected to the second The other end of the lamp tube is connected to the power source through the first main winding; thereby, the "Hei power source system provides the same working current to the lamp tubes. Another embodiment of the lamp current sharing application circuit used in this creation, is M282278 :: ί !: the first transformer and the first winding of the first main winding and the eighth brother-the main winding and a second winding The second transformer transforms into one end of one or two main windings connected to an electric power source. Two = the first-person group is connected to a first lamp; a third transformer has-the main winding and-the first The third end of the third winding is connected to: Hai: Shiyuan 'the other end is connected to a second lamp through the second winding, and the-end of the third winding is connected to the third lamp The other end of the tube is connected to the power source through the first main winding; thereby, the power working current flows to the lamps. This creation uses the transformer's electromagnetic induction characteristics to make the loops formed by the transformers, '%, and serially connected to each other, so as to provide the same μ current to the Lian Lin Lu Shi =. At the same time, this creative system can be applied to the odd or even number of lamps, so that the lamp attendant can reach the current sharing balance while working, thereby improving the conventional circuit. According to the sixth graph theory, the coils at different levels must have different inductances, and they cannot be applied to odd-numbered healthy tubes. They can only be used for the shortcomings of the power of the second power of poem 2. 2. I have improved my understanding of the characteristics and technical content of this creation. Please refer to the following for a detailed description and drawings of this creation. However, the drawings are provided for reference only and are not intended to limit this creation. [Embodiment] Referring to the seventh figure, it is a schematic diagram of the lamp current sharing circuit of the second embodiment of the present invention. The circuit shown in the seventh figure is based on two lamps as an example, which includes a voltage transformer T1 having a first main winding Lip and a first winding 1 ^ 3; and a second main winding L2p A second transformer T2 of a second M282278 winding L2s 'one of the second main winding up is connected to a power source Vsec' and the other end is connected to the two first lamp tubes L1 through the first secondary winding, and the first The secondary winding L2s is connected to a second lamp L2 at one end, and the second domain group is up to connect the power source.

Vsec; thereby, the power source Vsec provides the same operating currents u, i2 to the lamps L1, L2. ,

The winding connection method of using the secondary winding of the first transformer τι in series with the primary winding of the second transformer T2 and the primary winding of the first transformer T1 in series with the secondary winding of the second transformer T2, and then by the first transformer T1 and the second transformer The electromagnetic induction characteristic of T2, the power source Vsec can transmit the current to the first lamp tube L1 and the second lamp tube L2 for use through the windings connected in series. At the same time, by deriving formula (1) below, it can be obtained that the currents flowing through the first lamp L1 and the second lamp L2 will be equal. Since the first transformer T1 is equivalent to the second transformer T2, so Lsl = Ls2, L / A = LP2, Lm = K · v \ Lp \

Fsec-(2χ5ΐ) .7 · 1 +/- 1 ^ 2)-/ 1-2- (2 / · Zw) · / 2 + / 1 · i? Z2-(2 * ^ * + / 2-2- (2 / + — = · {Ls2 + + 2 · Lm) + RLl l2 2 ·, f, (Lsmp2 + 2 · Lm, + RL2 If f or (Lsl + Lpl + Lm) is greater than RLl and RL2, then il = i2 In the above formula (1), Lpl, Lp2, Lsl, and Ls2 are the inductances of the windings of the first transformer T1 and the second transformer T2; Lm is the mutual inductance; RL1, Zhuang 2 are the impedance of the lamp; the power source vsec is the power source ; F is the working frequency of the power source; k is the coupling coefficient; i 1 and i 2 are the currents. In the above description, the first transformer T1 and the second transformer T2 have two sets of M282278 on both sides: the numbers are equal and equal Balancing transformer. At the same time, the first μ% and "°" first winding are connected in series in the form of polarity addition, and the "T main / winding and the first winding are connected in series in the form of polarity addition The first lamp tube L1 and the second lamp tube L2 may be a cold cathode tube (CCFL) or an external electrode cold cathode tube (EEFL). The eighth picture of the second test of the second month is the second embodiment of this creation Three lamps = circuit is not intended. The circuit shown in Figure 8 uses three lamps For example, its flute Γ has a first main winding Llp and a first winding Lis, and a state T1; one has a second main winding; a wide second transformer T2, and the second main winding L2p: : Duanrenlian-you two-junction power f Vsec, the other end is connected through the first winding Lis; one lamp officer L1; a third transformer T3 with a third main winding Up and a third winding L3S, One of the third main winding L3p: connected = to the power source Vsee, the other end is connected to the second money group ... connected to-the second lamp L2, and the-end of the third winding ... is connected to a second Lamp officer L3, the other end is connected to the power source VSec through the first main winding Up; thereby, the 'power source ^ ratio is to provide the same working current 12, 13 to the lamps LI, L2, L3. Complex> Consider the eighth figure, the three-lamp current-sharing application circuit shown in the eighth figure = the two-lamp current-sharing application circuit shown in the figure, the operating principle and formula are the same, so I will not repeat them here. In this way, 'this creative system can be applied to two or even multiple lamps, and the current is achieved when the lamps are working: balance, and then the conventional circuit will be improved in Different inductances f 'on the secondary coil and the common disadvantages that can not be applied to the odd number of lamps can only be applied to the even number of lamps. M282278: 4-sided ΓΓ, the first lamp L1, the second lamp L2 and The second = g L3 series may be a cold cathode tube (CCFL) or an external electrode cold cathode tube (EEFL). The first transformer n and the second transformer τ voltage transformer have equal winding resistances, and the first main winding:-丄 is connected in series with the side secondary winding L3s in the form of polarity addition. The second main winding ^ 2ρ and the first winding Lls are connected in series in the form of polarity addition. The first-main winding L3p and the second winding L2s are connected in series in the form of polarity addition. Please refer to the seventh diagram and the ninth diagram, which is a schematic diagram of a lamp current sharing application circuit according to the third embodiment of the present invention. The T-type transformer winding connection shown in the ninth figure is slightly different from the seventh figure. The main reason is that the winding polarities of the transformers Π and T2 used are different. Therefore, when the transformer windings are connected in series, it is necessary to use Adding the polarity principle to connect is the figure of δ, which is the spirit of the creation, and the tenth figure is the schematic diagram of the current sharing circuit of the three lamps in the fourth embodiment of the creation. The three-lamp current-sharing application circuit shown in the tenth figure and the two-lamp current-sharing application circuit shown in the ninth figure have the same operating principle and formula ^ derivation, so they will not be repeated here. In this way, the creative system can be applied to odd or even number of lamps, and the lamps can achieve current sharing when they work ^ balance, and then improve the conventional circuit will produce different inductances in the coils at all levels, and can not be applied to odd numbers One lamp can only be applied to the common disadvantage of an even number of lamps. In summary, this creation is based on the use of a plurality of transformers with a primary winding and a secondary winding, and one end of the secondary windings of these transformers are respectively connected to two tubes. The other end is connected to a Power source 1 With this winding connection method, the power source system can use these transformers to achieve 12 M282278 to achieve current sharing balance during kf operation, thereby improving the conventional circuit will produce different inductances in the coils at all levels, and cannot It is applied to the odd number of lamps, and it is only applied to the common disadvantage of the even number of lamps. > Exactly, the above description is only a detailed description of a specific embodiment of the creation and a schematic drawing. However, the characteristics of this creation are not hidden here, and are not intended to limit the scope of this creation. The following patent application should be taken as the standard. "Everything that is appropriate for the scope of the patent in this creation and similar changes =: embodiment" should be included in the scope of this creation, anyone familiar with the

In the field of this creation, those who can easily consider the changes or modifications are covered by the patent scope of the following case. [Schematic description] The first picture is a conventional single-circuit schematic diagram of adjusting two lamp currents using a differential ballast; the first diagram is the equivalent magnetic circuit diagram of the transformer of the first diagram; the first diagram is the first diagram A diagram of a conventional equivalent magnetic circuit connecting a lamp tube; Section: = For the conventional use of a differential ballast to adjust the early circuit diagram of a plurality of lamps; Kanji No. 1 is another conventional use of a differential ballast to adjust Schematic diagram of the early circuit of the lamp; < Another kind—a conventional schematic diagram of adjusting the early circuit between the electric lamps of a plurality of lamps using a differential ballast; the electric snapshot is the second embodiment of the current sharing of the lamp Application Circuit Schematic Example Three Lamp Current Sharing Application Circuit Blame The eighth picture is the second picture of the creation; 13 M282278 The ninth picture is the second diagram of the third embodiment of the lamp current sharing application circuit; the tenth picture This is a schematic diagram of the third lamp current sharing application circuit in the fourth embodiment of the present invention. [Description of main component symbols] Known: 10 AC power supply 12 Transformer> 120 magnetic core 121 first coil 122 second coil 141 first tube 142 second tube G reference potential II, 12 current Al, A2 side pillar ► A3, A4 shoulder post Φ, Φ 1, Φ 2 magnetic flux △ V correction voltage 31, 32 lamp 39 differential ballast element 131, 132 lamp current TI, T2, T3, T4, T5, T6, T7 differential Ballast elements U, L2, L3, L4, L5, L6, L7, L8 tube 14 M282278 This creation:

Ll, L2, L3 lamps

Vsec power source Ti, T2, T3 transformer

Lip, L2p, L3p, Lis, L2s, L3s winding resistance il, i2, i3 working current

15

Claims (1)

M282278 9. Scope of patent application: 1. A lamp current sharing application circuit, including a complex, a transformer, all of which has a main winding and a primary winding, and these secondary windings are connected to a lamp. The other end of the tube is connected to a power source through the main winding of an adjacent transformer; by this, the power source provides the same working current to the lamps through the transformers. 2 · As stated in the patent | 巳 m, the current sharing application circuit of the lamp tube, so that these transformers can be an even number of converters or an odd number of dust converters, 3. The lamp current sharing circuit described in the above item, wherein the transformers have equal number of winding turns. 4 · Rushen Eye Patent No. 1! The lamp current sharing application circuit described in item 1, = The tube system can be a cold cathode tube) or the external electrode cold cathode tube 5. Two =!:? The lamp current sharing application circuit described in item 1, where% u The secondary windings are connected in series in the form of polarity addition. 6 · A kind of lamp current sharing application circuit includes: a first transformer 'having -the -main winding and -the -second winding; and a second A transformer has a second main winding and an a, a long, and first long winding. The-: two-connection :: terminal is connected to a power source, and the other end is connected through the first, second, and second windings. The other end of New Power Source Lu 'is connected to the electricity 16 through the first-main winding. By this, the power source system is phase 7. If the scope of the patent application is the second one, the first-lamp tube and current sharing application circuit, where External electrode cold cathode tube ⑽L ;. It is a cold cathode tube (CCFL) or outside 8. If the scope of the patent application is item β, the first transformer and the second official current sharing application circuit, where the Q,, ^ ^ 芰 I states have equal winding turns. The lamp current sharing application circuit described in the second item, the second item, wherein ^ connects the main group and the secondary winding, and is connected in the form of polarity addition. The lamp current sharing application circuit described above is electrically connected in the form of polarity addition in the form of electrical two-main winding and the first-second winding. u. A lamp current sharing application circuit, including the first! The weight loss has a first main winding and a first winding; ―the transformer ^ has-a second main winding and-a second winding, and one end of a main winding is connected to a power source and the other end Connected to a first lamp tube through the first winding; and a second transformer having a third main winding and a third secondary winding, one end of the third main winding is connected to the power source, and the other end passes through the The second winding is connected to a second lamp, one end of the third winding is connected to a third lamp, and the other end is connected to the power source through the first main winding; thus, the 'power source system provides the same The operating current to these lamps. 2. The lamp current sharing application circuit as described in item 11 of the patent scope of the application, wherein the first lamp, the second lamp and the third lamp may be cold cathode 17 M282278 tubes (CCFL) or External electrode cold cathode tube (EEFL). 13. According to the lamp current sharing application circuit described in item 1 of the scope of the patent application, the first transformer, the second transformer, and the third transformer are in the basin; and equal winding turns. And the other 14. Λ application material f_U rhyme time-sharing wire circuit, basin connected in series ^ the main winding 4 third winding, connected in series in the form of polarity addition. … 4 person windings, which are in the form of polarity addition. The lamp equalizing circuit described in item 11 of Zhongli is connected in series. … Heidi… Human winding ’is in the form of polarity addition