TWM265740U - Circuit for uniform current of lamp tube - Google Patents

Description

M265740 8. Description of the new type: [Technical field to which the new type belongs] A lamp current sharing application circuit, especially a connection relationship between a plurality of transformers and a plurality of lamps, for adjusting the electricity generation between the plurality of lamps: Hengzhi's lamp current sharing application circuit. s ”Machine Flat [Previous Technology] Due to technological advances and consumer demand, the size of LCD panels is so large that single-lamp tubes can no longer meet their lighting requirements, so two or more lamps need to be used. In order to ensure the brightness of LCD panels In the same sentence, the current of each lamp must be adjusted so that the amount of current flowing through each lamp is equal to that of the cold cathode fluorescent lamp (CCFL), which is highly unstable and negative: It is difficult to maintain the same lamp impedance, causing = the current cannot be equal. In addition to the uneven current between the lamps, in addition to the unevenness of the current, lamps with too much current will also shorten the length and make the lamps age. The speeds (AgingRate) are inconsistent. However, it is a conventional method to use a differential ballast to adjust two two: = diagrams. It includes a first coil with a first coil ㈣ and a transformer 12 ′ first coil ⑵, one end of which is connected: parent Current source 1Q, the other end is connected to the first tube ⑷ = the other end of the lamp 141 is connected to the reference potential G. and a first position G. As described above, the other end of 42 is connected to the reference Electric first-line ... second ': turn again ^ provides stable current L, ί2 are used for the second differential ballast, which are used separately, and s 141 and the second lamp 142 use M265740, so that the current flowing through the first lamp 142 and the second lamp 142 is balanced. The effect is shown in the picture. Please refer to the second picture, which is a schematic diagram of the equivalent magnetic circuit of the transformer 12 in the first picture. As shown in the second picture, the magnetic core 12 ° includes two side posts. A1 and A2, and the two shoulder posts A3 and A4. When the currents I ,, ^ are the same, t, and f pass through the first coil 121 * the current of the second coil 122 is also equal to '' and '' Baozhou _ L · in the first-coil The magnetomotive force generated by 121 is also equal to the magnetomotive force generated by the current l in the second coil 122, that is, the magnetomotive force in ㈣A1 'and the magnetomotive force in side pillar A2 cancel each other, so the shoulder post A3 and the shoulder There is no magnetic flux in Central A4. At the same time, the magnetic flux in side column A1 and side column A2 ① φ φ 2. The loop can be completed through the outer air gap, but because the magnetic resistance of air gap is very high, this The inductance effect caused by the circuit can generally be ignored. Please refer to the first picture in Figure 2. Please refer to the third picture of McCaw, which is the first picture of the equivalent magnetic circuit connection kg. When the current I! Of the first lamp tube 141 is different from the current 12 of the second lamp tube 142, the magnetomotive force generated by the current h on the first coil 121 and the current l2 on the second coil 122 The generated magnetomotive forces are also different, that is, the magnetomotive forces in the side column A1 and the side master A2 are not equal. The difference between the two is added to the side column A1, record A2, shoulder column A3, and shoulder column M. Low-resistance loop to generate a large amount of magnetic flux ①, the magnetic flux ❿ cuts the first coil ^ and the second wire mesh 122, and induces between its ends-a correction pressure ^ This correction voltage forces the first lamp The current of the tube 141 is equal to that of the current of the first tube 142. ^ Refer to the fourth figure, which is a schematic diagram of a conventional simple circuit using a differential ballast to regulate the complex k-element current. The simple circuit shown in the fourth figure includes M265740 including a plurality of first coils 121 and a second coil. In the transformer 12 of the coil 122, one end of the first coils 121 is connected to a reference potential G, the other end is respectively connected to a first lamp tube 141, and the other end of the first lamp tubes 141 is connected to an AC power source 10. And one end of the second coils 122 is connected to the reference potential G, and the other ends of the second coils 122 are respectively connected to a second lamp tube 142, and the other ends of the second lamp tubes 142 are connected to the AC power source 10. As described above, the AC power source 10 forms a differential ballast through the first coil 121 and the second coil 122 of the transformers 12 to provide stable currents h and I2 to the first lamps 141, respectively. Use with these second lamp tubes 142, so that the current flowing through the first lamp tube 141 and the second lamp tube 142 achieves the effect of balancing. It is limited to the current between the two lamps and cannot be balanced with other lamps. effect. Please refer to the fifth figure, which is another simple circuit diagram for adjusting the lamp current using a differential ballast. As shown in the fifth figure, two lamps are used as an example. The two lamps 31 and 32 are connected in parallel. The high-voltage ends of the two lamps 31 and 32 are connected to an AC power source through a differential ballast element 39. 10. The differential ballast element 39 can generate a correction voltage that is proportional to the mismatch between the lamp currents 131, 132 and can be superimposed on a common drive voltage. Therefore, after the modified driving voltage, the currents 131 and 132 of the lamps can be adjusted appropriately to make them evenly distributed. Although this circuit can ensure that the currents of the two lamps are equal, their structure generally includes a specific shape of the magnetic core and the coil frame, and these magnetic cores and coil frames are not generally standard products, so that in the material arrangement and cost control All are inconvenient. Please refer to Figure 6, which is another simple circuit diagram for adjusting the current of multiple lamps using a differential ballast. As shown in the sixth figure, a plurality of differential M265740 dynamic ballast elements (Ti, T2, and Td are connected to the cross-connect # 'T5'T6'T7) are tree-shaped to achieve the current balance U: 2, L3 , L4, L5, L6, L7. The operation principle is the same as that described in the fifth figure. The conventional shovel _M and official current circuit in the above description has a common gap: when it is above multiple lamps, it can only Application == Can be applied to an odd number of lamps, and the number of lamps in the sixth figure is shown. * Li Bai is different and can only be applied to two times. [New content] In view of this, the original you _ ^ I think you are like a kind of straight and official current application circuit. Its main eyepiece is closed with a / number Λ transformer: return / .: the other side of the second i voltage transformer is connected and connected in series to form one. ^ Use, under-voltage electromagnetic induction characteristics, and cry through these transformers: Group reading = closed loop flow of f, ..., = q two lamps connected to the other side of the winding generate the same working power The lamp officer current sharing application circuit embodiment uses a plurality of ^ I, one ^ respectively connected to a power source; and the other end of the lamps are tied to one side of several voltage regulators, the other- The side winding string t forms a closed loop, whereby the power source system can provide the same working current to the lamps. Another embodiment of the lamp current sharing application circuit is to connect one end of the k-tube together, and use the other end of these lamps-'end M265740 knife = connected to a number of device-side windings The other end of the winding is connected to a power source. At the same time, the other side of the transformers are connected to form a closed circuit. Here, the Hai power source provides the same current to the lamps. The lamp current sharing application circuit used in the creation of electric books has a plurality of embodiments. The-terminal of the lamp is connected to the-one of the plurality of transformer groups = one end of the winding on one side of the transformer and the other end of the winding on one side is connected. To a power source, and the other windings of the transformers in the first plurality of transformer groups are connected in series to form a closed loop. At the same time, the other end of the lamp tubes is secreted to a second plurality of transformer groups. One side of the transformers is connected to the second side, and the other end of the I / Zewu group is connected to the second power source, and the brother: the windings on the other side of the transformers in the plurality of transformer groups are connected in series. Therefore, the first power source is the same as the second power source. The working current reaches these lamps. = Creative department, the closed loop formed by this group in series using the electromagnetic induction characteristics of the inkjet device, so that the current flowing through the winding _ ㈣ 1 is applied to the other side windings On the other hand, / The same day Shouben creative department can be applied to the odd or even number of lamps two, the Asian Ambassador lamp tube to achieve current sharing balance, and then the second brother = :; r coils must have different shortcomings on paper. G 上The number of lamps can only be applied to the power of two. In order to understand the content of the technical review 1 # _, you can understand the characteristics of the abstract and the technical drawings. Only the table test is provided. * ㈣ 与 附 ® 'However ^ " brother Ming It is not used to limit the creation of M265740 system. [Embodiment] = Refer to the diagram of Leqi, which is the schematic diagram of the current sharing and application of the two lamps in this creation. The element of the seventh diagram > + μ " ^ Bad circuit Take two lamps as an example, which includes two lamps 3 L2), one end of the two lamps (LI, L2) is connected to a power source, and the other end is connected to one side of the transformer (Π, Τ2). Winding (仏, j2p), and the other winding (Lis, L2s) of the transformer (Τ 卜 Τ2) are connected in series to form a closed circuit. Circuit. Through the transformer (T1, T2) electromagnetic induction characteristics and through these transformers (T1, T2)-side windings (Lis, L entangled closed loop formed by the closed circuit), so that one side winding (Lls, L2s) flows through The currents ix are equal. By using =, the power source Vsec provides the same working current (ii, i2) to the two lamps (U, L2). In the above description, the transformers (T, T2) have winding turns on both sides They are equal and equal transformers. At the same time, the two lamps (LI, L2) can be cold cathode tubes (CCFL) or external electrodes (EEFL). e ▲ Stomach, please refer to the seventh picture, where the transformer (T1, T2) is a two-balanced transformer, so the number of windings E on both sides of the transformer T1 is equal (Nlp = number of windings on both sides of the Mt. Takayama transformer T2). Equal (N2p = N2s), so it can be known that the equivalent inductances on the windings on both sides of the transformer will also be equal, as shown in the following formula G): LIp—Llsj L2p ~ L2s (1) ^ surface type In sub-section (1), LIp and Lis represent the equivalent inductance settings on the windings on both sides of the transformer T1, and L2P and L2s represent the equivalent inductance values on the windings on both sides of the transformer T2. If yes, in the case of transformer T1 and transformer T2, the equation (1) can be written as shown in the following equation (2):, M265740 L1p = L1s = L2p = L2s (2) At the same time, because transformer T1 and The equivalent inductance value of the transformer T2 winding is equal, so the mutual value (MI, M2) generated between the windings on both sides of the transformer (Ti, T2) will also be approximately equal, as shown in the following formula (3) : M1 = M2 (3) In the above formula (3), M1 is the mutual inductance value between the windings on both sides of the transformer τΐ, and M2 is the mutual inductance value between the windings on both sides of the transformer T2. Please refer to the seventh figure again. It can be seen in the figure that the value of the power source Vsec can be obtained from the internal resistance value (ZbZ2) of the lamp U, L2 and the operating current ^; Equivalent inductance ([ip, L2P); mutual inductance (M1, M2) generated between windings on both sides of transformer τι, T2; and current flowing through voltage transformers Ti, T2 — side windings (Lis, L2s) ix calculated, as shown in the following sub-paragraphs (4), (5): 7sec = (Z1 + plus) · & — ίχ (加 Ml) (4)

Kec = (Z2-l · 7 6 > i2p) · z2-ιχ {] ωΜl) (5) In the above formulas (4) and (5), ω is expressed as the operating frequency value of the power source Vsec, and j is expressed The equivalent inductance value (1 ^,! ^) On the winding resistance is the inductance characteristic. From the above equations (4) and (5), the following equation (6) can be obtained as follows: (Z1 +] ωηρ \ ιχ-ιχ {] ωΜ \) = (Z2 -f] ωΣ2ρ \ i2-ιχ (] ωΜ2) ⑹ And, after the formula (6) is sorted, the following formula (7) can be obtained to know the value of the working current 丨!, as shown below: ^. = (Z2 + ^ Z2 ^ ^ _ίΦ ^ Μ2) ^ ιχ (] ωΜ \)) ZO1 ^] ωΠρ ZO1 +] ωΙ \ ρ ⑺ With reference to equation (7), the mutual inductance values Μ1 and M2 due to the windings on both sides of the transformer T1 and T2 are Are equal (M1 = Μ2), so the 11 M265740 watt-hour electrical value shown in the formula (?) Can be written as shown in the following formula {{2 ^] ωη?) · ~ ^ Ϊ́ + ΤωΪΛ} h考 ^ After examining formulas (2) and (8) and sorting them out, you can know that the following formula (9) is shown: (Z2 + 7 ^ Z1ρ) + Mu ip) (9) From the above formula, we can It is learned that when the internal resistance values of the two lamps U, L2 (⑵, Z ± 2) are less than the operating frequency value of the power source Vsec 0 and the equivalent inductance value 仏%, the operating current core of the lamp u will be equal to the lamp The working of the L2 is the electric continent I2 (11- I2). On the right, when the internal resistance values of one of the lamps L1 and L2 are not equal to Yin Z2), the operating current of the lamp L1 is equal to the operating current of the lamp L2 12 (1F 12)-the same holds true. As can be seen from the above formula, this creation is based on the pressure-deficit and undercharacteristic characteristics. The closed circuit formed by the transformer T1 and T2-side windings is connected so that the currents ix flowing through the side windings are equal to provide the same The current 11M2 is used for the lamps L1 and L2 connected to the other winding: the working current of the lamps U, L2, and 12 reach the current sharing balance, and then the improvement of Baizhi circuit will cause different levels of coils. The sense of f, and the common disadvantage of not being able to be applied to countable lamp officials, but only applicable to an even number of lamps = please refer to the eighth figure, which is the circuit diagram of the three-tube current sharing application. The circuit shown in Figure 8 uses three lamps as an example, which includes two tubes α, L2, L3), and one end of the three lamps (u, L2, L3) is divided into :: to a power source Vsec, The other end is respectively connected to one side winding (LlP, L2p, L3p) of the transformer u, T3), and the side windings (L1 s, L2S, L3s) of the transformer (n, T2, τ3) are connected in series to form a closed circuit. By the transformer 12 M265740 (Ti, T2, T3) electromagnetic induction characteristics, and through these transformers (τι, η T3)-side windings (Lls, L2s, L3s) formed by the closed loop formed by closed loop Through the transformer (T2, T2, T3)-the currents S of the side windings (Lls, L2s, L3s) are equal, whereby the power source Vsec provides the same working current (^, ^) to the two lamps (U, L2). In the above description, the number of turns of the windings on both sides of the transformers (Ting, T2, T3) are equal, and they are equal balancing transformers. At the same time, the two lamps (U, L2, L3) may be cold cathode tubes (ccfl) & electrode cold cathode tubes (eefl). ΜRefer to the eighth figure. The three-lamp current-sharing application circuit board shown in the eighth figure: The two-lamp current-sharing application circuit shown in the seventh diagram has the same operating principle and formula. Add more details. In this way, the odd or even number of complex lamps are used, and the lamp fJL is operated === balance, and then the improved conventional circuit will be applied to the odd number saki on the coils at all levels, and can only be applied to the even number two. The sound η ::: is the creation of another two-tube current sharing application circuit = The circuit is based on the two-tube as an example, which includes Yus (L, L2), which two lamps (u, L2 ) One reference end G and the other end are connected to one side winding of Λ = ⑺, T2 through two later blades (L1P, L2P) respectively, and the other side-T2) electromagnetic induction characteristics, and the dust : Two closed loops 1 ^, T2) formed by changing _, L2S) series connection-side winding (L1S, side winding called the current 1χ phase '|: flowing through the transformer (T1, T2) one for the same Working current (^ force = Vsec system to increase x — / and official (Li, L2). In the above 13 M265740 Ming, these transformers (T1, Tu 2) /, the number of turns on both sides of the winding are equal, and the phase The temple's Qianheng Shuangwuyi. At the same time, the 2-pole tube coffee) or the external electrode cold cathode tube (^). Hitting the tenth picture for Lingyin is another three intentions of this creation. Show Thunder Package three lamps (U, L2, ... lamps as an example, including, Chala a), the three lamps (11, L2, one end of each are 'Lingkao end G, and the other-through the transformer respectively (Π, T2, T3) „,) The other side windings (L1S, L2s, L3s) are connected in series to form a single

Two ((T2, T3))-side windings (Lls, L2s, L3s) are connected in series to form a closed circuit, so that the current through the winding cores, ^, ^ of the transformer windings, T2, and T3 is equal to 1X. Therefore, the power source Vsec provides the same working current (ii, h, to the three lamps (u, L2, u). The above description and: the undervoltage gain (Ti, T2, T3) should be counted on both sides of the winding They are equal and equal transformers. At the same time, the two lamps (u, L2, u) can be cold cathode tubes (CCFL) or external electrode cold cathode tubes (EEFL). '' ,,

^ Reference to the ninth and tenth pictures, such as the lamps shown in the ninth and tenth pictures: current sharing application circuit, its operation principle and formula deduction system and the lamps shown in the seventh and eighth pictures The tube current sharing application circuit is the same, so I will not go into details here. This creative system can be applied to an odd or even number of lamps and achieves the current sharing balance when the lamps are working, thereby improving the conventional circuit. It has different common inductances, and cannot be applied to the odd number of tubes, and can only be applied to the common disadvantages of the even number of lamps. The eleventh picture of the Ming Dynasty examination is a circuit diagram of the current for multiple lamps. The circuit shown in the tenth figure is based on the principle of fi0 = input from the terminals at the left and right ends of the lamp tube to reverse the electric potential = k-off lighting. Here, two lamps are used as an example. The thirteen lamp tubes (L, L2, L3) of the circuit have two ends, and the three lamps (u, L2, l are connected to a first-side winding through transformer T1, Ding 2, and Ding 3 respectively). A ^ The source of power Vsecl, and this change is a closed loop jg y〇T ^. At the same time, the other end of the; Qing ^ η ^ ΎΑ τα L3) is transmitted through the other side of T4, T5, T6 The windings are connected to—the second power source Vsec2, the other-side windings of the transformers are connected in series to form a closed loop. The above voltage τΓί is composed of T2 and T3 series-the first-a plurality of transformer groups, • The burglars of T4, T5, and T6 series are composed-the second plurality of variable renters. With the transformers (T2, T3, T4, T5, T6), Emperor-style processing of α and the transformers (η, T2, D3, T4), how to use the inch, TO Tq Τ / | τ, ΤΛλ b Τ6) — side winding (Lis, == closed loop formed by ^ L4 L5 Μ ΓΤ4, Τ5, ^ I Λ? Ixl Α1X2 ^ ° ^ -1 ^ cl and the power source Vsec2 is transmitted through the transformer Cry αΐρ, ul, L3p, L4p, L5p, L6p) provide the same 'electricity two: is) to the three lamps (Li, L2, L3). These transformers (T1, M j2 two, two) have equal and variable windings on both sides of the transformer. The two lamps may be cold cathode thin tubes or outer electrode cold cathode tubes (EEFL). It should be ==: number description, so if the connection method increases or decreases the lamp ’and its action :::: = 15 M265740 Same. For the eleventh figure of the test, as shown in the eleventh figure, the operation principle and the derivation of the formula are the same as those in the seventh figure. Two = use:, the tube current sharing application circuit is the same, so it will not be repeated here. This book: To = apply to the balance of odd or new complex lamps, and then improve the conventional circuit will be at all levels; secondary production; different inductance I, and the common disadvantages of not being able to apply to the odd and even lamps. Lu Shangyi applied to the current sharing application of the lamps used in the creation of these transformers. The windings on one side of these transformers are connected in series. Electricity = two = The windings have the same current to provide the same work. Two lamps on the other side are used. At the same time, this second creation IS: on a countable or even number of lamps, and when the lamp is in operation, the circuit will generate no less than an odd number of lamps on all levels of wires. This creation is in full compliance with the patent patent application. Please check and add to the T element 'Old friends protect the creator's rights and interests. If the fishing bureau feels virtuous, please write to us. There is no suspicion in the case of Yiyibei, but the above is only the best of this creation = two and the diagram, but the characteristics of this creation are not limited to this area. The garden should use the following examples of patent applications, which should be included in the scope of this creation. Anyone familiar with this item: 16 M265740 In the field of this creation, changes or modifications that artists can easily think about can be covered in The patent scope of this case is as follows. [Brief description of the diagram] The first diagram is a simple schematic diagram of a conventional circuit using a differential ballast to regulate the current of two lamps; the second diagram is a schematic diagram of the equivalent magnetic circuit of a transformer in the first diagram; the third diagram is the first diagram One picture is a schematic diagram of a conventional equivalent magnetic circuit connected to a lamp tube. The fourth picture is a simple circuit diagram of a conventional ballast that is used to adjust the current of a plurality of lamps. The fifth picture is another conventionally used differential ballast. A simple circuit diagram of a lamp to adjust the lamp current; the sixth diagram is another simple circuit diagram of the conventional use of a differential ballast to adjust the plurality of lamp currents; the seventh diagram is a schematic diagram of the second lamp current sharing application circuit; Figure 8 is a schematic diagram of the three-lamp current-sharing application circuit of the creation; Figure 9 is a schematic diagram of the other two-lamp current-sharing application circuit of the creation; Figure 10 is a schematic diagram of the other three-lamp current-sharing application circuit of the creation; and Figure 11 is a schematic diagram of a plurality of lamp current sharing application circuits. [Description of symbols of main components] Known: 1 〇 AC power supply 12 transformer 12 0 magnetic rage 17 M265740 121 first coil 122 second coil 141 first tube 142 second tube G reference potential II, 12 current A A2 side Column A3, A4 shoulder Φ, Φ 1, Φ 2 magnetic flux △ V correction voltage 31, 32 lamp 39 differential ballast element 131, 132 lamp current T1, T2, T3, T4, T5, T6, T7 difference Dynamic ballast element LI, L2, L3, L4, L5, L6, L7, L8 lamps This creation: U, L2, L3 lamps

Vsec power source

Vsecl first power source

Vsec2 second power source Ti, T2, T3, T4, T5, T6 transformer

Lis, L2s, L3s, L4s, L5s, L6s, Up, L2p, L3p, L4p, L5p, L6p winding resistance 18 M265740 ix, ixl, ix2 current ii, i2, i3 working current Mb M2, M3 mutual inductance

Claims (1)

M265740 9. Scope of patent application: 1. A lamp current sharing application circuit, which includes a number of hard tubes, one end of which is connected to a power source, and a number of transformers, the side windings of which are connected to this. The lamp-end and the other-side windings are connected in series to form a closed loop. ::: The power source system provides the same work. 2. The lamp circuit as described in the application section. The circuit is an even number of tubes or an odd number of tubes. The current equal to the number of tubes as described in the item of the scope of the patent application. The plurality of tubes can be cold cathode tubes ( ). ~ ^ Lu (CCFL) or external electrode cold cathode 4. The current sharing circuit of the lamp tube as described in the scope of the application for patent! These transformers have equal winding resistance. 、 / 、 中 5. A lamp The tube current sharing application circuit includes: a plurality of lamp tubes, one end of which is connected together; a hard number H ', one of its side windings, is connected to the other end of the lamps, and the other end is connected to one Power source and its other winding are connected in series to form a closed loop As a result, the electric power source provides the same working current to the lamps. 6 · For example, the scope of the patent application: 5 lamp sheet current sharing application circuit, among which, the lamps can be an even number of lamps Or an odd number of lamps. • The lamp current sharing application circuit described in item 5 of the patent application, wherein the plurality of lamp systems can be cold cathode tubes (CCFL) or external electrode cold cathode tubes (EEFL). 20 M265740 8. The lamp current sharing application circuit as described in item 5 of the scope of patent application, wherein the transformers have equal winding turns. 9 · A lamp current sharing application circuit includes: a plurality of lamps , Each has two ends; the first plurality of transformer groups has a plurality of transformers, one end of one side of the transformers is connected to one end of the lamps, and the other end of one side of the windings is connected to a first A power source, and the windings on the other side of the transformers are connected in series to form a closed loop; a second plurality of transformer groups having a plurality of transformers, and one end of one side of the transformers is respectively connected to the lamps The other end, one, the other end of the winding is connected to a second power source, and the other side of the transformers are connected in series to form a closed loop; thereby, the first power source and the second power source The same working current is provided to these lamps. A. If you apply for a full-time current sharing circuit for the ninth item of the full-time application, "Hai some lamps can be an even number of tubes or an odd number of tubes. 丨 1 · The lamp current sharing application circuit described in item 9 of the application patent, wherein the plurality of lamp systems may be cold cathode tubes (CCFL) or external electrode cathode cathode tubes (EEFL). According to the lamp current sharing application circuit, the transformers have equal winding turns. twenty one