TW200541408A - A multi-lamp-tube driving device - Google Patents

Abstract

Disclosed is a multi-lamp-tube driving device, wherein a primary coil of a transformer is wound around a plurality of magnetic cores in a sequential and alternately reversed manner and is connected to an exciting power source to receive power for excitement. When the primary coil is excited, the current that flows through the primary coil maintains the same, which imposes identical but of sequentially reversed directed magnetomotive forces to the multiple magnetic cores and induces magnetic flux. The magnetic flux passes through the magnetic core of the transformer and induces a corresponding working voltage in a secondary coil, which is then processed by a ballast element for supplying uniform current for operation of cold cathode fluorescent lamp.

Description

200541408 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a multi-lamp driving device, in particular to a transformer used in driving at least one cold cathode fluorescent lamp (CCFL), and Multi-lamp driving device using such a transformer. [Prior technology] It is known that a cold cathode fluorescent lamp (CCFL, Cold Cathode Fluorescent Lamp) is used as a light source of a backlight module (B a c k 1 i g h t S y s t em) in a liquid crystal display panel (L C D P a n e 1). These cold cathode glare lamps are driven by a drive circuit called an inverter. Due to technological progress and consumer demand, the size of LCD panels has continued to increase, making single lamps unable to meet their lighting needs, so two or more lamps need to be used due to the brightness of the lamps. Lamp total + τ 仏, as < working current has a close relationship. If the working current is large, then the brightness of the lamp is obvious. Conversely, if the working current is small, the brightness of the lamp will be relatively reduced. . However, in the application of tritium and rubber tubes, the working current flowing through these lamps will have different characteristics when the tubes are delivered from the factory, and the noise during the aging process is deviated from the mother lamp. Therefore, if the working currents of the lamps are not the same, there will be some differences. This will cause the user to view the images with different brightness on the LCD panel, which will affect the video quality. , ′ Generate Ming Please refer to the first picture, which is a block diagram of the conventional control of multiple lights. The driving circuit is connected to at least two cold-cathode fluorescent tubes using at least two controlled driving circuits, and at least two transformers such as device 2 and device 2 are respectively obtained from the cold-cathode fluorescent tubes. Descent T. The control " ~ working current,

200541408 V. Description of the invention (2) After the calculation process, the individual output voltages are adjusted and transmitted to the cold cathode fluorescent tubes 1 through the transformer T and a capacitor C to stabilize the cold cathode fluorescent lights. The operating current of the lamp tube 1 is at a predetermined average current. This method of adjusting the working current requires additional circuits to achieve a balanced control of the working current. Please refer to the second figure, which is a block diagram of a multi-lamp driving circuit for a conventional ballast with a strong ballast. The multi-lamp driving circuit uses a controller 2 to connect at least two cold-cathode fluorescent tubes 1 and a transformer T. The controller 2 obtains the total working current of the cold-cathode fluorescent tubes 1 and adjusts its output voltage after calculation processing, and boosts the adjusted voltage through the transformer T and passes the ballast element B. , Respectively, applied to the cold cathode fluorescent tubes 1 to stabilize the total current of the cold cathode fluorescent tubes 1. The ballast elements B are equal or extremely high-capacitance capacitive or inductive units; because of the extremely high impedance, they can dominate the working current flowing through the lamps, and because of the equality, they can make the operating current of the lamps Consistently balanced. To maintain these high-impedance ballast components, a very large output voltage is consumed, and the transformer T must therefore provide a very high output voltage to achieve the required lamp operating current. Please refer to the third figure, which is a block diagram of a conventional multi-lamp driving circuit using a differential ballast element. The multi-lamp driving circuit uses a controller 2 to connect at least two cold-cathode fluorescent tubes 1 and a transformer T. The controller 2 obtains the total working current of the cold-cathode fluorescent lamp tubes 1 and outputs a adjusted voltage after calculation processing, and boosts the adjusted voltage through the transformer T, and then passes through a differential ballast. Current element DB to distribute the input current to the cold cathode fluorescent lamps 1 to stabilize the cold cathode fluorescent lamps 1

200541408 V. Description of the invention (3) Total current of I-tube 1. Differential — — The left-handed ballast of the π tube's electricity h, will evenly distribute the lamp voltage when there is a deviation in the lamp current, so the forced lamp current will be strong and huge. Dimensional volume phase of this differential ballast element Summary of the invention

Master of the invention! α M The main purpose is to provide a transformer (CCFL) and a cold-cathode fluorescent tube driving device for small (CCFL) driving. control. In order to achieve the above purpose, the multi-lamp drive transformer of the present invention is connected to an excitation power source and the cold-stage pole vines, and the paper 7 u pole fluorescent lamp ( CCFL). The ballast element can be selectively inserted into the connection of the lamp tube. | End, which is at one end of the other secondary coils of these center pillars-, < π ..., bed 7U >and; (C C F L), and is connected to a reference end. The other ends of the secondary coils are connected to the other ends of the cold cathode fluorescent lamps (CCFL) through a ballast element, respectively. i When the transformer is excited, the primary coil is wound on the center column in series and alternately in the reverse direction. Therefore, on the adjacent center columns, in the above description, the transformer system includes There is a magnetic core, which has a first side pillar and a second side pillar. At least two middle pillars are arranged between the first side pillar and the second side pillar. At one end of the center pillars, secondary windings are wound in series and alternately in series. The coils of the primary winding are connected to the excitation power source to obtain the power required for excitation. Same as **, the coils are respectively wound with a secondary coil, which are respectively connected to the cold cathode fluorescent tubes

Page 7 200541408 V. Description of the invention (4) 丨 will accept equal size and square „aa Ⅰ. ——To the opposite magnetomotive force and generate corresponding magnetic flux, these magnetic flux system will flow to the first of the transformer Side pillars, adjacent pillars, or the second pillar, and then flow back to the pillars to form a magnetic flux loop. Because the magnetomotive forces on the pillars are the same, they are wound around the pillars The secondary coil at the other end will sense the equivalent secondary voltage and U-pieces, which will generate the average output current, and provide this; Ballast 2: Make = Reach "for the work of current balance, please refer to; ^ :: -fUnderstand the features of the present invention and the technical drawings of the technical institute only provide reference blood $ x = detailed description and drawings, but I system. It is not intended to limit the present invention. [Embodiment] Please refer to the fourth figure, which is a schematic diagram of a driving circuit for driving two lamps. l (g, h), < are respectively transparent;; = description. The cold-cathode glory tube | the transformers T1 and T2—the secondary coil p is connected to the ink converters T1 and T2, and the two ends of the primary side line are connected in series and reversely connected in series, the same as T2 and T2. The primary side coil resistance needs to be the same, and the transformer needs to be the same. In this way, when the transformer n, ，, the number of turns of the secondary coil flows through the transformers T1 and T2—the primary coils of the secondary coil are excited, and the two phases of the secondary coil are induced to lose phase. | The small m gives these cold cathodes 2: pressure, which will also produce the same large I schematic. Which is based on driving two = two ^ transformer converter winding and circuit block | and Lu as an example. Multi-lamp of the present invention, page 8 200541408 V. Description of the invention (5) The tube driving device 1 is connected to one end of some cold cathode glory lamps (g, h) by a transformer Tr, and the transformer 1Tr is more transparent A ballast element (p, q) is connected to the other ends of the cold cathode glare lamps (g, h), respectively. In the above description, the transformer Tr dance includes a magnetic core i 〇, which has a younger side pillar 12 and a younger side pillar 14. Between the first side pillar 12 and the second side pillar 14 , The system is provided with two middle pillars 16. And at one end of these center pillars, they are wound in series and alternately in series and reversely. The secondary coil 11 is connected at both ends of the primary coil 11 to the excitation power source v. Used to obtain the power required for excitation. At the same time, on the other ends of the middle pillars 16, a secondary-side coil 13 is wound, and one end of the secondary-side coils 13 is respectively connected to the cold-cathode fluorescent tubes (g , H) and are commonly connected to the reference terminal G. The other ends of the secondary-side coils 13 are connected to the other ends of the cold-cathode fluorescent tubes (g, h) through ballast elements (P, q), respectively. When the transformer Tr is excited, the primary side coil 11 is wound in series on the center pillars 16 in sequence and reversely, so it will be accepted on the adjacent center pillars 16 The magnetomotive forces of equal size and opposite directions generate corresponding magnetic fluxes, which will flow to the first side pillar 1 of the transformer T r, the adjacent other middle pillars, or the second side pillar 1 4. Flow back to the center pillars 16 to form a magnetic flux loop. Because the magnitudes of the magnetomotive forces on the center pillars 16 are equal, the secondary windings 1 3 wound around the other end of the center pillars 16 will induce equivalent secondary voltages and pass through the ballasts respectively. The components (p, q) provide the average working current of the cold cathode fluorescent lamps (g, h). In addition, because these phases

200541408 V. Description of the invention (6) The magnetic flux in the adjacent center pillar will take the adjacent center #mesh to the right and the direction is opposite, so the magnetic flux loop base is therefore no matter the number of center pillars: only a small deviation The magnetic flux will go through the side posts: increase. The number of side pillars is small, and the number of cross-pillars and the cross-sectional area are not used. In the above description, I and the cold cathodes and the ballast elements (p, q) are capacitors and impedances. At the same time, when this-attack ^ s (g, h) moves, the relatively high number of turns is equal. The parallel coils 11 are wound on the central pillars 16 and the coils on the central pillars 16 of the coils. The secondary coils 13 are wound on the current capture units (the equivalent is not equal to that of the electric current.) Alternatively, the present invention may have either (g, h) end, which is connected to the cold-cathode fluorescent tubes to obtain the resistance ((not labeled)) flowing through the cold-cathode fluorescent tubes. Please refer to section Six pictures, this is the present; another real J? Cha: stream. Another invention of this invention-multi-tube turmoil: a case to illustrate for example., These closures / at least-closed magnet ... 22 series in order JJ secondary coils 22, stomach-secondary coils are serially connected in parallel and connected to the excitation power required for the field operation. Furthermore, ^ ψ Λ ^, please take a one-by-one ± # 丨 绿 朴w ZZ ^ ^ The closed magnetic core 20 is further rolled separately? One-human-side coil 24, and one end of these secondary-side coils 24 will be respectively connected to cold cathode fluorescent tubes (g, h) ", and are commonly connected Test in J: The other ends of the secondary-side coils 24 are respectively connected to the cold-cathode fluorescent tubes (g, h) through the (p, q) 200541408 V. Description of the invention (7 ) When the primary side coils 22 are excited, because the primary side strings: are wound on the closed magnetic cores 20, the magnetomotive forces of equal size are generated on the closed magnetic ^ '^, and generate Corresponding magnetic fluxes will form a magnetic flux loop on the closed magnetic angers 20 respectively. = The magnitudes of the magnetomotive forces on the closed magnetic cores 20 are the same, so they are simultaneously bound to the closed magnetic cores 20 The secondary-side coils 24 of the magnetic core 20 will induce a coincidence = a small secondary voltage and pass through the ballast elements (p, q), respectively, to provide this: the average value of the cold-cathode fluorescent tube (g, h) 7 In the above description, the ballast elements (p, q) are capacitors, which have relatively high impedance when operating with the cold cathode fluorescent tubes (g, h): at the same time, The primary-side coils 22 have the same number of turns. Moreover, the secondary-side coils 24 have the same number of turns. Furthermore, the present invention may further have a current capture unit (not labeled). Is connected to either end of the cold-cathode fluorescent tubes (g, h), and can be connected by at least one resistor (not labeled) It is used to obtain the working current flowing through the cold-cathode fluorescent tubes (g, h). Match the fifth figure of B, and refer to the seventh figure of Qing, which is a moxibustion pressure of a further embodiment of the present invention: Schematic diagram of wires and circuit blocks. The present invention is based on driving three lamp officials as an example. The difference between the transformer Tr 1 used in the present invention and the transformer Tr shown in the fifth figure is the difference between the column 16 Number, because the transformer T r is used to drive two lamps, the middle pole 6 used by it is one, and the transformer T r 1 is used to drive three lamps, so the used middle pole 16 is Three. Furthermore, the primary side coil wound on the 16-end of the column in the transformer Tr1

Page 11 200541408 V. Description of the invention (8) The 11 series are sequentially and reversely wound in series and wound on the center pillars. The primary coil 11 and the two ends of the coil are connected to the excitation power supply. v, used to obtain the power required for excitation. At the same time, a secondary coil i 3 is wound on the other ends of the middle pillars 6 and one end of the secondary coils 3 is respectively connected to the cold cathode fluorescent tubes (g , H, 丨) and are commonly connected to a reference terminal G. The other ends of the secondary-side coils 3 are connected to the other ends of the cold-cathode fluorescent tubes (g, h, i) through ballast elements (p, q, r), respectively. When the Tr 1 is excited as described above, the coils are wound at the same time to receive large, other magnetic fluxes, other poles, or loops. The central pillars 16 are pressed separately, and the light tubes (g,, in the central pillar are routed similarly. Regardless of the description of the plus 0, the present invention drives three lamps. When the transformer is driven by the primary coil,丨 丨 series, sequentially and reversely alternate some of the center pillars 16 in sequence, so on these adjacent center pillars 丨 6 will have the same and opposite direction of the magnetomotive force, and generate the corresponding magnetic flux system flow To the first side columns 1 2 of the transformer T r 丨, the second side columns 14 adjacent to it, and then flow back to the middle columns 16 to form the same magnetomotive force on the middle columns 16 The secondary-side coil 1 3 wound around the one end will induce equivalent secondary electricity to pass through the ballast element (p, q, r), and provide the average working current of these cold cathode fluorescent lamps h, 1). In addition, since these adjacent magnetic fluxes are similar in size and opposite in direction, the magnetic flux loops will be based on the adjacent ones, and only a small amount of deviation magnetic flux will pass through the side pillars. Due to the number of pillars, the number of side pillars and the cross-sectional area do not need to be increased. In summary, a transformer is used to sequentially and reversely alternately connect the side coils to the excitation power source and obtain the power required for excitation.

200541408 V. Description of the invention (9), ^! When the coil is excited, a current of the same magnitude is passed on the primary coil, and a magnetomotive force of the same magnitude is applied, and the corresponding obstacle is prevented. The magnetic flux; at the same time, the phase § operating voltage is induced on the secondary coil, and respectively passes through the armor current element to provide the average cold cathode fluorescent lamp working current. In addition, since the size of the magnetic flux in adjacent transformers of these transformers is similar and the directions are opposite, the magnetic flux loop will basically pass through the adjacent central pillar, and only a small deviation of the magnetic flux will pass through the side pillar. Therefore, regardless of the number of center pillars, the number of side pillars and the cross-sectional area need not be increased. However, the above description is only one of the best detailed descriptions and drawings of the specific implementation of the present invention. Any embodiment that is within the scope of the patent application of the present invention 类似 = similar changes should be included in the application of the present invention. In the field of the present invention, any skilled person in the field of the present invention can cover any of the decorations in the following patents in this case: "Variation or repair 200541408" A simple illustration of the diagram: The first picture is A block diagram of a conventional multi-lamp driving circuit for controlling multiple lamps; the second diagram is a block diagram of a multi-lamp driving circuit that uses conventional ballasts; a third diagram is a conventional multi-lamp driving that uses differential ballasts The schematic diagram of the circuit block; the fourth diagram is the schematic diagram of the multi-lamp driving circuit of the present invention; the fifth diagram is the schematic diagram of the transformer winding and circuit block of the present invention; the sixth diagram is the schematic diagram of the transformer winding and circuit block of another embodiment of the present invention; And FIG. 7 is a schematic diagram of a transformer winding and a circuit block according to another embodiment of the present invention. Explanation of drawing number: Known: 1 cold cathode fluorescent tube 2 controller T transformer C capacitor B ballast element DB differential ballast element The present invention: g, h cold cathode fluorescent tube P, q capacitor

Page 14 200541408 Schematic description

Th T2 transformer V excitation power supply 1 Multi-lamp driving device Tr, Trl transformer 1 0 Magnetic anger 11 Primary side coil 1 2 First side post 1 2 1 4 Second side post 1 3 Secondary side coil 16 Middle post G reference end p, q ballast element 2 multi-lamp driving device 2 0 closed magnetic core 2 2-secondary coil 2 4 secondary coil

Page 15

Claims (1)

200541408 6. Scope of patent application 1. A multi-lamp driving device connected to an excitation power source for driving at least two cold-cathode glory lamps, including: a transformer including: a magnetic core having at least _Side pillars, at least two middle pillars are arranged adjacent to the side pillars; the secondary side coil ^ has two ends of the coil connected to the excitation power source, and is connected in series and reversely alternately and wound around the at least two secondary sides The coil is a τ Dugong, and one of the secondary coils is #% above the center pillars, and one end of the fluorescent tube is connected to a cold cathode connected to the cold The other end of the side coil of the cathode fluorescent tube is the other end of the technique described in item 1 of the scope of patent application. There is at least a-ballast element, which is connected to the ^ / Wei moving device, the more end of which. ~ Let any of the cathode fluorescent tubes 3 · As described in the scope of the patent application, the first current capture unit at the end of the multi-lamp described in Item 01, the bar ## drive device, which is connected to the 4b A ^ ~ Let any of the cathode fluorescent tubes 4 · The primary side coils of the multi-lamp camp as described in item 1 of the scope of the patent application be wound in sections on the center pillars & driving devices, which are equal. The number of turns of each section of the coil is 5. As described in item 1 of the scope of the patent application, the multiple secondary coils are wound around the middle stiffeners " ’Its coil resistance is 6 · — a transformer with multiple lamp driving devices, including Page 16 200541408 VI. Patent application scope A magnetic core, which has at least one side pillar, at least two middle pillars are arranged adjacent to the side pillar; —— secondary coil, which is connected in series and reversely in series. Winding on the center pillars; and at least two secondary coils are respectively wound on the center pillars. 7. A multi-lamp driving device connected to an excitation power source for driving at least two cold-cathode fluorescent tubes, including: at least two closed magnetic cores, each of which forms a magnetic core Pass the closed path; at least two primary-side coils are respectively wound on the closed magnetic cores, which are connected in series and connected to the excitation power source; at least two secondary-side coils are respectively wound on the closed cores. One end of each secondary-side coil is connected to one end of a cold cathode fluorescent lamp; the other end of the secondary-side coil is connected to one of the cold-cathode fluorescent tubes. another side. 8. The multi-lamp driving device according to item 7 of the scope of the patent application, wherein at least one ballast element is connected to any one end of the cold-cathode fluorescent lamps. 9. The multi-lamp driving device according to item 7 of the scope of the patent application, wherein a current capture unit is further connected to any one end of the cold-cathode fluorescent lamps. 10. The multi-lamp driving device according to item 7 of the scope of the patent application, wherein the primary and secondary coils on the closed magnetic cores have equal coil turns ratios.