TW200533246A - Serial/parallel connection method and circuit of dual-output transformer bridging plural cold cathode fluorescent lamps and method and circuit for examining abnormal cold cathode fluorescent lamp - Google Patents

Abstract

The present invention is related to serial/parallel connection method and circuit of dual-output transformer bridging plural cold cathode fluorescent lamps (CCFL) and method and circuit for examining abnormal cold cathode fluorescent lamp. The serial/connection method contains the following steps: providing the first output transformer and the second output transformer; providing the first bridging arm, which is connected between the first terminal of the secondary side of the first output transformer and the first terminal of the secondary side of the second output transformer so as to have a parallel connection with B branches where each branch can be connected in series with L lamps; providing the second bridging arm, which is connected between the second terminal of the secondary side of the first output transformer and the second terminal of the secondary side of the second output transformer so as to have a parallel connection with B branches where each branch can be connected in series with L lamps; and connecting (B-1) current balance transformers in series between the first bridging arm and the first terminal of the secondary side of the first output transformer as well as connecting (B-1) current balance transformers in series between the second bridging arm and the second terminal of the secondary side of the second output transformer when driving 2BL cold cathode fluorescent lamps.

Description

200533246 V. Description of the Invention (1) [Technical Field Circuit of the Invention :: bridging a series of parallel cold cathode lamp tubes and a parallel method, an abnormality detection method of a private circuit and a Q cathode lamp officer, and an output voltage-varying bridge complex number Only cold cathode tube, 0 ~ inside of the cathode tube, s, three-string sub-connection method and circuit, and cold detection method and circuit, prior technology

Di pole χΞ1 Takes the tube lamp poles of the moving picture and other + 1+ r i electric various portable meters and video display splav \ mP 5 ^ 0Bal ^^^ quld crystal

Play (LCD, LCD) has become a variety of flat display t ^^ CCold Cathode Fluorescent I ' The display has the basic function of 5 weeks as a basic backlight source. In order to cooperate with many internships, only 1% of the output mode of the traditional backlight power supply is used-the output transformer PT-1 is shown as the cold cathode lamp f 2 power output stage 11. The conventional conventional backlight shown in Figure-':::, as in the first-the connection method of the plurality of cold cathode lamp tubes is only connected in parallel with 2 output transformer drives, and six cold cathode lamp tubes are connected in parallel. For the table = method, in the second figure, the output power stage 1 1 contains an output transformer p τ-1 as "there is only a single method, during which five current balancing transformers are required to average the current of the moving cold cathode lamp. The cold cathode abnormality detectors 1 to 1-5) serve as the lamp current detection circuit 12 formed by the lamp body and the like. In the embodiment, the parallel connection of the six cold cathode lamps requires a mountain stream. In the first picture, the lamp current detection

Page 5 200533246 V. Description of the invention (2) Circuit 12. The ratio of the lamp tube composed of the capacitor-current detection circuit i 2 to the capacitor and the diode. In addition, the luminous efficiency of the seed tube and the total efficiency of the system are too large, which leads to the meter effect, and because of the number of parts, the cost is increased by the cost of the parts. Experiments and studies, i :: t, in view of the lack of conventional technology, have carefully studied "Dual Output Transforming Cry," The "cold loss." Is used to improve the lack of the above-mentioned conventional methods. [Summary of the Invention] The number of the present invention can be reduced according to the above two: the current of the cold cathode tube of each branch is required to be reduced. A number of lamp tubes and a second arm are connected to the secondary circuit of the output transformer, and each second bridge arm is connected to the second output of the B branch circuit only on the second side of the cold cathode lamp stage. This case provides a The dual output transformer 51 g + series-parallel method, the steps of which include providing [; two bridge rear wheel output transformers; providing a first bridge arm, V first wheel output transforms the second bridge of the-output transformer secondary side, -Bridge is connected to the Λ and Λ tube; a second bridge arm is provided, the end = the second to = the tube 'is connected to the first bridge arm L: two " and, the drive 2BL end is connected in series T current balance transformers, and the number of times is 1. Asia 200533246 V. Description of the invention (3) The second bridge arm is connected in series with the second end of the secondary side of the second output transformer (B- 1) Current balance transformers. As mentioned, the lamps are cold cathode lamps, and the shape of the cold cathode lamps includes straight 1-shaped tubes, U-shaped tubes and other suitable for backlight power supply. Shaped type of cold cathode tube. As described, the first output transformer and the second output transformer are Drive power pack. The method as in claim, each of the first bridge arm a way a series of more stable capacitance.

In the method described, L is 1 or 2. As described, the total number of current balancing transformers is 2 (B-1).

According to the above concept, the present invention also provides a series-parallel connection method for a dual output transformer to bridge a plurality of lamps. The steps include providing a first output transformer and a second output transformer. The second end of the secondary side of the first output transformer is provided. Connected to the second end of the secondary side of the second output transformer; providing a bridge arm connected to the first end of the secondary side of the first output transformer and the first end of the secondary side of the second output transformer End, and the bridge arm is connected in parallel with B branches, and each branch can be connected with L cold cathode lamp tubes in series; and when the BL cold cathode lamp tubes are to be driven, the bridge arm and the first output transformer (B-1) current balancing transformers are connected in series between the first ends of the secondary side. According to the method described, the lamps are cold cathode lamps, and the shapes of the cold cathode lamps include straight 1-shaped tubes, U-shaped tubes, and other types of cold-cathode tubes suitable for backlight power sources.

Page 7 200533246 V. Description of the invention (4) As described in the method, the first output transformer and the second output transformer are a driving power supply group. As described, a stabilizing capacitor is connected in series on each branch of the bridge arm. In the method described, L is 1 or 2. According to the above idea, this case also provides a lamp abnormality detection method for detecting the abnormal state of the lamps in a system connected to a plurality of branches. Any of these branches includes at most two lamps, and the The iso-branch system is electrically connected to at least one current balancing transformer, the current balancing transformer has a detection winding, and the steps of the method include detecting a detection voltage on the detection winding; a detection output signal is generated in response to the detection voltage. ; At least one corresponding warning element should be driven due to the detection output signal to indicate a branch circuit with an abnormal lamp, and the detection output signal is transmitted to a system safety identification circuit to determine whether the abnormal lamp can continue Use; and via a feedback controller to determine whether the system is to be stopped or continued. According to the method described, the lamp is a cold cathode lamp, and the shape of the cold cathode lamp includes a straight 1-shaped tube, a U-shaped tube, and other types of cold-cathode tubes suitable for backlight power sources. As described, when the lamps are in a normal state, the detection voltage is zero. As described, when any of these lamps is in an abnormal state, the detection voltage is not equal to zero. As described, the detection voltage is generated by a detector.

200533246 V. Description of the invention (5) Detection output signal. As described, the corresponding warning element is a light emitting diode.

According to the above-mentioned concept, the present case further provides a series-parallel circuit of a dual-output transformer bridging a plurality of lamps, including a first output transformer; a second output transformer; a first bridge arm, the first bridge arm is connected to the The first end of the secondary side of the first output transformer and the first end of the secondary side of the second output transformer, and the first bridge arm is connected in parallel to the B branches, and L lamps can be connected in series on each branch Tube; and a second bridge arm, the second bridge arm is connected to the second end of the secondary side of the first output transformer and the second end of the secondary side of the second output transformer, and the second bridge arm is B branches are connected in parallel, and L lamps can be connected in series on each branch; wherein the first bridge arm and the first end of the secondary side of the first output transformer are connected in series (B-1) Current balancing transformers, and (B-1) current balancing transformers are also connected in series between the second bridge arm and the second end of the secondary side of the second output transformer. According to the method described, the lamps are cold cathode lamps, and the shapes of the cold cathode lamps include straight 1-shaped tubes, U-shaped tubes, and other types of cold-cathode tubes suitable for backlight power sources.

As described, the first output transformer and the second output transformer are a driving power supply group. As described, a stabilizing capacitor is further connected in series on each branch of the first bridge arm. In the method described, L is 1 or 2. As described, the total number of current balancing transformers is 2 (B-1) 0

Page 9 200533246 V. Description of the invention (6) According to the above-mentioned structure, a series of lamp tubes are connected in parallel; circuit: its spoon two: "output, calendar f bridge complex two output transformer, this The first output: wide: an output becomes a robber;-the second end connected to the second output is connected to the bridge arm at the ψ =,-end; and a bridge arm , The two output voltages are changed ί times: = voltage regulator: the first end of the under-level side and the first path, and each branch 忒 and the bridging arm system are connected to β branches and the first output is tight. A is connected to L cold cathode lamps; among them, the bridge arm current is balanced and transformed; the first ends of the stage sides are connected in series ⑼ 1) cold lamps, such as straight cathodes, and the cold cathode first Cold cathode tubes of various shapes and types for power supplies. In the method described above, the first green device is a driving power pack. 1 and 10 The second output voltage is changed in series. A stable capacitor is connected in series on each branch of the bridge. L is 1 or 2. It is used to detect the 卞 中 卞 if: re ;: a common type of lamp abnormality detection circuit, 1 A of lamp camps connected to a plurality of branches in the 忐 system • 忐, any one of the 忒 temple branches contains at most- /, ㊉ connected to at least-current balance transformer, and these branches are electrical detection windings, 1 contains at least ^ δ δ Xuan current balance transformer has _ Bingbao 3 main J / a detector, Lei Qin ^ voltage Device for detecting at least one port on the winding / Λ current leveling transformer output, electrically connected to the detector, producing and detecting the method as described above according to the above-mentioned concept 200533246 V. Description of the invention (7) The at least one corresponding warning element is driven by the detection of the signal of the lost person to indicate that: 1 crane t & 2 branches;-system security identification circuit, electrically connected to the port 丄 for receiving the connection cockroach The transmitted lamp checks whether the abnormal lamp can continue to be used; and once judged, it is connected to the security authentication circuit of the system to determine the system: the electrical connection continues to operate.疋 Whether to stop or—as described, the lamp is a cold cathode lamp, and the shape of the lamp includes a straight 1-shaped tube, a U-shaped tube, and various types of cold cathodes that form the cold cathode power source. tube. Applicable to backlight As described in the above method, when the lamps are all in the positive measurement voltage system is zero. When X is angry, the detection method is as described. When any of these lamps is in fire, the detection voltage is not equal to zero. When the state is ~, the corresponding warning element is the X nine-diode as described above. [Embodiment] Moonlight power supply is an inverter converter (I nverter), the basic architecture includes Royer, push-pull (push — puU), eight $ output stage (Full-bridge), half-bridge (Half — bridge), flyback, and forward. The output transformer structure includes a center tap (for Royer and push-pull) and a primary side (for full-bridge, half-bridge, flyback and forward, etc.). Pumping type. The conventional backlight power source is shown in single-stage output driving mode, and two types are shown.

200533246 V. Description of the invention (8) The backlight power converter of the present invention has three driving modes, including two sets of single power output stages 21 and 22, including a single output transformer PT-1, PT-2 driving mode, as shown in the second figure (A) shown; single group of power output stage 2 3 contains two output transformers PT-1, PT-2 primary side parallel drive mode, as shown in the second figure (b); and single group of power output stage 2 4 contains a single The output transformer has two output winding drive modes on its secondary side, as shown in the second figure (c). In the cold-cathode tube parallel connection method of the present invention, three types of transformer output structures as shown in Figs. 2 (a) to 2 (c) are used as bridge driving sources. The second figure (a) shows two sets of single power output stages 21, 22 with a single output transformer PT-1, PT-2 drive mode, which are made up of two sets of backlight power converters with completely independent and same characteristics The output transformer of the two converter converters is formed and used as a load bridge of a cold cathode tube. The second figure (b) shows a single group of power output stage 23 with two output transformers PT-1, PT-2 primary side parallel driving mode, which is formed by a single group of backlight power converters, but its power stage 2 3 The output side is formed by connecting two independent output transformers PT-1 and PT-2 with the same characteristics in parallel. The connection method is to correspond to the primary-side terminals of the two output transformers PT-1 and PT-2. It is connected, and the secondary-side output windings of the two output transformers PT-1 and PT-2 are used as load bridges of cold cathode tubes. The second figure (c) shows a single group of power output stage 24 with a single output transformer. Its secondary side has two output winding drive methods. It is formed by a single group of backlight power converters. Its power stage 24 output side There is only one independent output transformer. The transformer includes a primary-side winding, but the secondary side is formed by two sets of output windings with the same characteristics, and the two sets of output windings are used as load bridges for cold cathode tubes.

Page 12 200533246 V. Description of the invention (9) The present invention is a device and method for driving a cold cathode tube by using a dual output transformer as a backlight power module to improve output power. The present invention uses a dual output transformer as a driving power supply group. Connection method for connecting a plurality of cold-cathode lamp loads in series and parallel in a bridge manner. The bridge method can adopt two-arm load connection method (as shown in Figures 3 to 5) and single-arm load connection method (as shown in Figures 6 to 7). Please refer to the third figure, which is a schematic diagram of a two-arm symmetrical bridge method of two cold-cathode lamp tubes connected in series. It can be seen from the figure that the CCFL-1 of the cold cathode lamp is connected in series with a stabilizing capacitor C to form a branch, and the CCFL2 of the cold cathode lamp is connected in series with another stabilizing capacitor C to form another branch, and the two branches are respectively It is connected in series between the first end of the secondary side of a first output transformer PT-1 and the first end of the secondary side of a second output transformer PT-2 and the first end of the secondary side of the first output transformer PT-1. Between the two terminals and the second terminal of the second output transformer PT-2. Please refer to the fourth figure, which is a schematic diagram of the double-arm symmetrical bridge method of eight cold-cathode lamp tubes connected in series and parallel. As can be seen from the figure, this method uses a first bridge arm and a second bridge arm, wherein the first bridge arm is composed of two branches and is connected to the secondary side of the first output transformer PT-1. Between the first end and the first end of the secondary side of the second output transformer PT-2, two cold cathode lamp tubes and a stabilization capacitor C are connected in series on each branch. At the same time, a current balancing transformer T-1 is connected in series between the first bridge arm and the first end of the secondary side of the first output transformer PT-1. The structure of the second bridge arm is similar to that of the first bridge arm. It is composed of two branches and is connected to the second end of the secondary side of the first output transformer PT-1.

Page 13 200533246 Fifth invention description (10), the second side of the secondary side of the second output transformer PT-2 is connected in series with two cold cathode lamps and one, and each J bridge arm and The second output transformer — ㈣ — is connected in series with a current balancing transformer τ — 2. Please refer to the fifth figure between the second end, and wait for the + -wheel-out transformer to symmetrically bridge the two side-by-side lamp tubes in parallel, using the first method—the first bridge-brake arm and the second = ϋ. As can be seen from the figure, the party is described by three branches and connected to the first-bridge 2 of 3? The-terminal and the second output change: == =,〗, and the mother-branch line is connected in series with two cold cathode strict two PT ~ 2 terminal C. At the same time, the gatekeeper at the first end of the first bridge splitting-stabilizing capacitor side is 0. The output transformer PT-1 secondary 哕 笸 r, θ, D, and two current balance transformers T 彳 "bridge The structure of the arm is the same as the surname of the first bridge arm: Le :, T-2. And one branch road is similar, and it is connected by two cold cathode light tubes and one Between stability, on the 2nd, the second bridge arm and the second output transformer-'valley C. The same-Lier ^ series is connected in series with two current balance transformers _3, τ =, the first if Θ > See the sixth figure, which is a schematic diagram of the four cold cathode tube string it # single-arm bridging method. From the picture; Erya ::: Fang Cai double-lost-Guang Qiao arm system is composed of two branches: Connected to the first end of the secondary side of the output voltage receiver PT— 丨 which is connected to the first end of the ~ 2 secondary side, and each ^: turn out the transformer pole lamp and-stable ^ Just connect two cold 丨 j inch K Qiaodi bridge arms with the first

II Page 14 200533246

V. Description of the invention (11) ____ — Output transformer PT-1: A transformer T-1 is connected between the first end of the under-level side. For a current balance, please refer to the seventh head. It is a six-cathode cold-bridge transformer single-arm bridging method. It uses a 7Γ bridge arm and a second bridge arm for double wheels. The branch group < is connected to the first output transformer; Second, the arm is connected to the second side of the second output transformer PT-2 by one end of f and -1: the under-level side and the mother branch On the road, two cold-cathode lamps are connected in series with the Yi'an-di terminal. The second temple 'transforms between the first-bridge arm and the first output; . The two ends of the current balancing transformer T-i and the t-th secondary side are connected in series between the same ends. It can be known that each of the bridge arms of the present invention I * 2 J branch, and each branch can be connected in series up to Multiple doubles can be connected in parallel! In the bridge load method, the arms of each arm are: If the number of lamps is the same, the number of lamps must be the same, but the total number of lamps must be determined by the number of circuits and cold cathode power. If the single-arm bridge load method is adopted, then the output of the device and the number of cold-cathode lamps must be changed according to the output voltage == the number of branches on the arm adopts the bridge-type parallel connection method. Ray: It depends on the output. The quantity can be the smallest, and the average number of each balance transformer can be achieved. The demand for balanced current transformers is ① the number of cold cathode lamp electrodes is L) and the number of branches is B. Leng Yin (1) One-arm bridged multiple cold cathode lamps: Implementation of Figures -7 For example, when the required currents are connected in parallel, if the number is (B-1), the number of cold cathode lamp tubes T-χ with an average current or two. In the embodiment shown in the sixth figure, four 隹 ... BL, where l is 1 tube (U2, B = 2) are connected in series and parallel

Page 15 200533246, only one current balancing converter is needed — 1. (2) The double-arm bridged multiple cold cathode tube branches, in the embodiments shown in Figures 5 to 5, when the required current balance becomes subj, there are three (B-1), the number of cold cathode tubes with an average current is The number of Bu x is 2 2. In the embodiment shown in the fourth figure, eight cold fuses'—where 1 is 1 or connected in parallel, only two current balancing transformers are needed. The lamp f (L = 2, β = 2) is connected to the cold cathode of the present invention. A lamp coil abnormality detector 2 is added with a detection coil winding as an average state of the current balance change current, as shown in the eighth figure (a) / thunder, each cold > The detected coil windings on the cathode lamp official power T-2 are κ-1 n :: balanced t voltage, there is an abnormal phenomenon in the cold cathode lamp current on a certain branch, the coil winding K on a bridge arm eight -1 or K-2 will be able to sense the signal in real time, and send it to the second line and a system security identification circuit 81 to a feedback = detector ~ Dn system security, as shown in Figure 8 (c) Show. The current level is based on the eighth graph (a) to the eighth graph (c) as an example, to remove / make the original: N2, take the first current balance transformer τ-1 as an example, and each 11 When counting ^ i ^ J, ^ ^ t (CCFL-1 5.CCFL ^ 4) ^ ^ ^ ^, ii2 = k. Among them, if there is a small amount of current in one lamp tube, the balance voltage regulator D- 丄 will automatically adjust according to Ampere's law to make the amount of traces become zero, and make each lamp reach the equilibrium state. , 卞 'Please refer to the eighth figure (C), which is the method of detecting the abnormality of the tube of the eight-cathode cold-cathode tube and the dual-output transformer double-arm bridge method. Kn is attached to the current balance transformer: intentionally, a plurality of detectors D-1 to Dn, a plurality of ports p — nn 糸

Page 16 200533246 V. Description of the invention (13) The system security authentication circuit 81 and a feedback control circuit 82. The eighth figure (a) is a schematic diagram of the current balancing transformer T-1 including the detection winding {(-1), and the eighth figure (b) is a practical winding physical diagram of the eighth figure (a), in which the winding coil Number N] = N2, the number of coils N3 on the detection winding K-1 is determined by the demand of the detection signal. When the first current balancing transformer T -1 belongs to the two lamps (CCFL1 to CCFL) -4) When the current is in the equilibrium state, that is, ii2 = i34, then it is detected that the winding K-1 = 〇 and V56 = 〇. If a lamp on the two roads is in an abnormal state, for example, the lamp aging occurs Or open circuit problems, then ii2 is closed ^, I56 # 〇 on the winding K-1 is detected and v56 = i56Ri is off 〇. Other current balancing transformers τ_ η also have the same detection capabilities as described above. For example, if τ _ A certain lamp on 1 is in an abnormal state, and the detection voltage V56 = ^ R 丨 will be sent to the detection Is D-1 input terminal of the eighth figure (c), and the output of the detector d-1 will pass through the port p — 1. On the one hand, driving LED-1 indicates that there is an abnormality in the lamp on the branch (the purpose is to indicate the location of the abnormal lamp for easy maintenance), and the output signal is also sent to The system safety identification circuit 81 determines whether the lamp can be continuously used, and then determines whether the system is to be stopped or continued to operate through the feedback control circuit 82. In summary, the method of the present invention can effectively reduce the required current The number of balancing transformers can achieve the purpose of averaging the cold-cathode lamp current of each branch. 'Effectively improving the lack of known technology is of industrial value, and thus achieves the purpose of developing this case. This case may be developed by those familiar with this technique. Ren Shijiang thinks of all kinds of modifications, but they are not inferior to those who want to protect the scope of patent application.

Page 17 200533246 V. Description of the invention (14) [Brief description of the diagram] The first diagram: the circuit diagram of the conventional parallel method of multiple cold cathode lamps. The second figure (a): it is a schematic diagram of two sets of single power output stage with a single output transformer driving mode. The second figure (b): it is a schematic diagram of a single group power output stage with two output transformers connected in parallel on the primary side of the drive mode. The second figure (c): it is a schematic diagram of a single group of power output stage with a single output transformer, and the secondary side with two output winding drive mode. The third picture: It is the intent of two cold cathode lamp tubes connected in series and using double output transformer double arm symmetrical bridge method. Figure 4: It is a schematic diagram of eight cold-cathode lamp tubes connected in series and parallel, and a double-arm symmetrical bridge using a dual output transformer. Fifth figure: It is a schematic diagram of twelve cold-cathode lamp tubes connected in series and parallel, using a dual-output transformer with symmetrical two-arm bridge. Figure 6: It is a schematic diagram of four cold-cathode lamp tubes connected in series and parallel, using a single-arm bridge method of a dual output transformer. Figure 7: It is the intention of six cold-cathode lamp tubes connected in series and parallel, adopting the double-arm transformer single-arm bridge method. Figure 8 (a): It is a schematic diagram of a current balancing transformer with a detection winding. The eighth figure (b): it is the actual winding entity diagram of the eighth figure (a). Figure 8 (c): It is a schematic diagram of the method of detecting the abnormality of eight cold-cathode lamp tubes connected in series and in parallel, using a dual output transformer and a two-arm bridge method.

Page 18 200533246 V. Description of the invention (15) [Description of component symbols] 1 1: Output power stage 1 2: Lamp current detection circuit 21: Power output stage-1 22: Power output stage-2 23: Power output stage 24: Power output stage 8 1: System safety identification circuit 8 2: Feedback control circuit

Page 19 200533246 Schematic description of the first diagram: The circuit diagram of the parallel method of multiple cold-cathode lamps is shown in the figure. The second figure (a): it is a schematic diagram of two sets of single power output stage with a single output transformer driving mode. The second figure (b): it is a schematic diagram of a single group power output stage with two output transformers connected in parallel on the primary side of the drive mode. The second figure (c): it is a schematic diagram of a single group of power output stage with a single output transformer, and the secondary side with two output winding drive mode. The third picture: It is a schematic diagram of two cold-cathode lamp tubes connected in series and adopting a double-output transformer double-arm symmetrical bridge method. Figure 4: It is a schematic diagram of eight cold-cathode lamp tubes connected in series and parallel, and a double-arm symmetrical bridge using a dual output transformer. Fifth figure: It is a schematic diagram of twelve cold-cathode lamp tubes connected in series and parallel, using a dual-output transformer with symmetrical two-arm bridge. Figure 6: It is a schematic diagram of four cold-cathode lamp tubes connected in series and parallel, using a single-arm bridge method of a dual output transformer. Figure 7: It is a schematic diagram of six cold cathode lamp tubes connected in series and in parallel, using the single-arm bridge method of a dual output transformer. Figure 8 (a): It is a schematic diagram of a current balancing transformer with a detection winding. The eighth figure (b): it is the actual winding entity diagram of the eighth figure (a). Figure 8 (c): It is a schematic diagram of the method of detecting the abnormality of eight cold-cathode lamp tubes connected in series and in parallel, using a dual output transformer and a two-arm bridge method.

Page 20

Claims (1)

200533246 6. Scope of patent application1. A double-output transformer bridge complex number ^^ ~ Includes the step-and-parallel method of Lu, its stepper and the second-round output provide a first bridge arm, which ^ The transformer; a bridge wall, the first end of the secondary side of the transformer and the second terminal connected between the first end, and the first bridge pile wall # 2 a secondary side of the daylight generator Between the first end and the -bridge arm are shot in parallel: L lamps can be connected in series; ~~~ branch provides a second bridge arm, the second bridge arm out of the transformer Side < second end and Xiaodi: ㈣㈣H read between the second end, and the second bridge arm is connected in parallel with β branches, and L lamps can be connected in series on each side; and 2BL In the case of a cathode lamp tube, (B —) electric transformers are connected in series between the first end of the first bridge arm and the secondary side of an output transformer, and are connected between the second bridge arm and the second Output transformer ^^ 1 'There are (B-1) current balancing transformers connected in series between the second end of the scale. Ge Ge Ze < 2 · The method as described in item 1 of the scope of patent application, wherein the cold cathode lamp tubes are burned, and the shape of the cold cathode lamp tubes includes a straight 1-split ^ ▲ pattern official and other Suitable for various shapes and types of cooling tubes for backlight power. 3. The method as described in item 1 of the scope of the patent application, wherein the first voltage transformer and the second output transformer are a driving power supply group. 4 · The method as described in item 1 of Shenjing's patent scope, wherein a stabilizing capacitor is connected in series on each of the branches ~. 5 · The method described in item 1 of the scope of patent application, where [is a 1-wheel 'wheel arm page 21 200533246 6. The scope of patent application 6. The method as described in item 1 of the patent scope, wherein the current balance transformer The total number is 2 (B-1). 7. A series-parallel connection method for a dual output transformer to bridge a plurality of lamps, the steps of which include: providing a first output transformer and a second output transformer, the second end of the secondary side of the first output transformer is connected to the A second end of the secondary side of the second output transformer; providing a bridge arm connected between the first end of the secondary side of the first output transformer and the first end of the secondary side of the second output transformer And the bridge arm is connected in parallel with B branches, and each branch can be connected with L cold cathode lamps in series; and when the BL cold cathode lamps are to be driven, the bridge arm and the first output transformer are (B-1) current balancing transformers are connected in series between the first ends of the stage sides. 8. The method as described in item 7 of the scope of patent application, wherein the lamps are cold cathode lamps, and the shape of the cold cathode lamps includes straight 1-shaped tubes, U-shaped tubes and other suitable backlight power sources Cold cathode tubes of various shapes and types. 9. The method according to item 7 of the scope of patent application, wherein the first output transformer and the second output transformer are a driving power supply group. 10. The method according to item 7 of the scope of patent application, wherein a stabilizing capacitor is further connected in series on each of the bridge arms. 1 1. The method according to item 7 of the scope of patent application, wherein L is 1 or 2. 1 2. —A kind of abnormal lamp detection method, used to detect Page 22 200533246 VI. The abnormal state of the lamps on several branches of the patent application. Any one of these branches contains at most two lamps, and these branches are electrically connected to at least one current balancing transformer. The current balance transformer has a detection winding, and the steps of the method include: detecting a detection voltage on the detection winding; generating a detection output signal in response to the detection voltage; At least one corresponding warning element is driven due to the detection output signal to indicate a branch with an abnormal light tube, and the detection output signal is transmitted to a system safety identification circuit to determine whether the abnormal light tube can continue to be used ; And via a feedback controller to determine whether the system is to be stopped or continued. 1 3. The method as described in item 12 of the scope of patent application, wherein the lamp is a cold cathode lamp, and the shape of the cold cathode lamp includes a straight 1-shaped tube, a U-shaped tube, and other suitable backlights. Cold cathode tubes of various shapes and types for power supplies. 14. The method according to item 12 of the scope of patent application, wherein when the lamps are in a normal state, the detection voltage is zero. 15. The method as described in item 12 of the scope of patent application, wherein when any of the lamps is in an abnormal state, the detection voltage is not equal to zero. 16. The method according to item 12 of the scope of patent application, wherein the detection voltage is generated by a detector to generate the detection output signal. 1 7. The method as described in item 12 of the scope of patent application, wherein the corresponding warning element is a light emitting diode. Page 23 200533246 The series-parallel circuit of the lamp tube, the sixth, the scope of the patent application 18 ·-a type of dual output transformer bridge complex includes only: a first output transformer; a second output transformer; a first bridge arm, the first in the rubbish " The first end of the secondary side of the voltage transformer and the second input between u ::, and the first bridge arm is connected in parallel with B 1s, and the L side can be connected in series with the L lamp tube; A second bridge arm is connected on each branch, and the second bridge arm is connected between the second end of the secondary side of the first output transformer and the second end of the secondary side of the second output transformer, and the The second bridge arm is connected in parallel to the B branches, and each lamp can be connected in series with L lamps; among them, the first bridge arm is connected in series with the third terminal of the secondary side of the first output transformer. (B-1) current balancing transformers, and the second bridge arm and the second end of the secondary side of the second output transformer are also connected in series (BO current balancing transformers. The method described in item 1, wherein the lamps are cold cathode lamps, and the shape of the cold cathode lamps is Contains straight 1-shaped tube, 1-shaped tube, 1-shaped tube and other cathode tubes of various shapes suitable for backlight power supply. 々 2 0 · The method described in item 18 of the scope of patent application, wherein the first _The transformer and the second output transformer are the driving power supply unit. Relief 2 1 · The method described in item 18 of the scope of patent application, wherein a stable power valley is connected in series on each branch of the-arm.榀 200533246 6. Scope of patent application 2 2. The method described in item 18 of the scope of patent application, where L is 1 or 2. 2 3. The method according to item 18 of the scope of patent application, wherein the total number of current balancing transformers is 2 (B-1). 2 4. A series circuit of a dual output transformer bridges a plurality of lamps, including: a first output transformer; a second output transformer, the second end of the secondary side of the first output transformer is connected to the second A second end of the secondary side of the output transformer; and a bridge arm connected between the first end of the secondary side of the first output transformer and the first end of the secondary side of the second output transformer, and The bridge arm is connected in parallel with B branches, and each branch can be connected with L cold cathode lamp tubes in series; wherein, the bridge arm is connected in series with the first end of the secondary side of the first output transformer ( B-1) current balancing transformers. 2 5. The method described in item 24 of the scope of patent application, wherein the lamps are cold cathode lamps, and the shape of the cold cathode lamps includes straight 1-shaped tubes, U-shaped tubes and other suitable Cold cathode tubes of various shapes and types for backlight power. 2 6. The method according to item 24 of the scope of patent application, wherein the first output transformer and the second output transformer are a driving power supply group. 2 7. The method according to item 24 of the scope of patent application, wherein a stabilizing capacitor is further connected in series on each of the bridge arms. 28. The method according to item 24 of the scope of patent application, wherein L is 1 or 2. 2 9, —A kind of abnormal lamp detection circuit, used to detect the On page 25, the scope of the patent application is that there are abnormally more than two lamps on several branches, and these branches are i =. Any of these branches includes a device. The current balancing transformer is connected to at least one current. Balance transformer ^ A check 'ηϊ * to at least one detector to measure the winding which should be detected on the winding = balanced transformer,' for at least one connection 璋, 电 远 # i generates a detection output letter electric transport Connected to the detector said that at least one pair is driven due to the output signal, = r J is used to respond to the branch of the inspection lamp; and g is a component to indicate that there is an abnormality that the connection is transmitting. You can continue to use it to receive it; and whether the chandeliers are different, whether it is OK; [= device, electrically connected to the system's safety circuit, for / 夬 疋 4 糸 system, whether to stop or continue operation. Use 30. The method as described in item 29 of the scope of the patent application, wherein the cold cathode, the lamp tube, and the shape of the cold cathode lamp tube include a straight 1 shape, two = yes, type tubes and other suitable backlight power sources Various types of cold poles, u 31 · The method as described in item 29 of the scope of patent application, wherein when the general manager is in a normal state, the detection voltage is zero. And B 32. The method as described in item 29 of the scope of patent application, wherein when any one of the lamps is in an abnormal state, the detection voltage is not equal to zero. And Lu 33. The method as described in item 2 of the scope of patent application, wherein the corresponding warning element is a light emitting diode. mouth