TWI360795B - Back light unit and transformer - Google Patents

Description

1360795 0610064ITW 20911twf.doc/n When the cold cathode (four) tube 1G4 is in normal operation, (4) has a stable current value. The 〃 light unit can effectively maintain the cold cathode fluorescent tube = t The above external circuit increases the cost of the hardware. ικνΙΤ α 'In order to respond to the start-up of the cold cathode fluorescent lamp, it is necessary to have a larger capacitance value, resulting in an overall hardware. Therefore, the present invention provides a transformer, Providing the hybrid poles of the red ginseng circuit, the other two also provide a kind of backlight unit, which can eliminate the need for external hair: 'the working voltage and current of the ancestors to the cold cathode lamp. side. The special difficulty is that two t(four)' have - the secondary side and - the second and the first end have - L. Between the other ends, there is a second inductance value. Source and transformer factory = view 3 to provide a backlight unit, including the light-sub-side is used to receive _; width; =; a $: and - secondary side 'with - first end, - measuring end The width of the first end: ^ and the measuring end and the first end; 'the second grounding, the first end has a second; the first sense and the second end and to - measuring electric grinder, value material, can Measuring it to represent the light source of its working characteristics moxibustion 1360795 061 (five) 64ITW 20911twf.d〇e / n number ' and from the second end of the job - axis signal, in view of _, the present invention # ^ ^ number The light source and the change shoe H ^ early 兀 include multiple sides, wherein the - secondary side is used to receive a pulse = change: f number of secondary sides have - the first end of the transfer amount „ 别 别, each - twice

= Quantity: There is a - inductance between the end and the first end. There is a second inductance value between the first & In addition, the above-mentioned measurement can measure the voltage, which represents the operating characteristic of the light source: the number ' and the second end outputs the - (four) signal to drive the corresponding light source to emit 0 k. The present invention provides another transformer that also has a primary side and a secondary side. In particular, the secondary side of the transformer has a first %, a first end, and a plurality of measuring ends, and each of the measuring ends and the second end and the first end have different inductance values.

Viewed from another point of view, the present invention provides a backlight unit comprising a light source and a transformer. The transformer has a secondary side and a secondary side, and the primary side is used to receive a pulse width modulation signal. More specifically, the secondary side has a first end, a second end, and a plurality of measuring turns. Wherein, the first terminal is connected to the ground and each of the measuring terminals and the inductance between the second end and the second end are different. In addition, different measurement voltages are measured from each measurement end to represent different operating characteristic parameters of the light source, and a driving signal can be rotated from the second end to drive the light source to emit light. The invention provides a backlight unit comprising a plurality of light sources and a transformer 1360795 0610064ITW 20911twf.doc/n. The transformer has a sub-down and a plurality of quadratic: one, the variable signal' and the per-secondary side corresponds to each = each secondary side has a -th - two

. The first end is grounded, and the inductance value between each measurement and the first one is different. Another Φ mother - the secondary side - the measuring end can measure different measurements every f 丄:: other: table, the light source has different working characteristic parameters, and from 7 to 2 y - the end is rotated The signal, the corresponding light, the green hair is not. As can be seen from the above, since the transformer provided by the present invention has one to several measuring terminals, different measuring voltages can be measured. Therefore, by using these #measured voltages, the user can know various operating characteristic parameters of the light source without arranging other external circuits. The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the invention.

[Embodiment] Several preferred embodiments are provided below to illustrate the technical features of the present invention. The present invention can be applied to a backlight unit using a cold cathode fluorescent lamp as a light source, and in the following description, a cold cathode fluorescent lamp will be exemplified. However, those having ordinary skill in the art should know that different light sources are also covered by the present invention' and this will not be repeatedly mentioned below. Further, the pulse width modulation signal in the following description can be generated by the pulse width modulation unit, and will not be specifically mentioned below. 9 <S) 1360795 0610064ITW 2091 ltwf.doc/n EMBODIMENT FIG. 2 is a circuit diagram of a backlight unit in accordance with a first embodiment of the present invention. Referring to FIG. 2, in the backlight unit 2A provided by the present invention, a side voltage regulator is included to drive the cold cathode fluorescent lamp 222 to emit light according to a pulse width modulation signal Vp. Transformer 210 has a primary side 212 and a secondary side 214. The primary side 212 receives the pulse width modulation signal Vp. More special is the secondary side

214 has a first end A1, a second end A2, and a measuring end M1. In the present embodiment, the first end A1 is grounded, and the first end A1 and the measuring end M1 have an inductance value L1, and the first end A1 to the second end A2 have an inductance value ^2. In this embodiment, the second end A2 is electrically connected to the cold cathode fluorescent tube 222'. Therefore, the transformer 21 can be driven according to the pulse width modulation signal Vp, and the driving signal I is driven from the first end A2 to drive the cold. Cathode fluorescent tube 222. In addition, a quantity of electricity measurement vfb can be measured from the measuring end M1. Since the inner/end end shares a magnetic circuit with the one end A1 and the second end A2, the relationship can be expressed as:

Also = LI (1) where λ is the magnetic flux linkage, and the voltage relationship is V = d^t L : the inductance value of the secondary side of the transformer 210 is based on the equation (1), and v and I are linear. . Therefore, under the operation of the backlight unit 200, the relationship between the output voltage Vout on the secondary side of the transformer 210 and the measured voltage Vfb< is: V0·. (2)

/420 A 1360795 20911twf.doc/n

0610064ITW is available from the above two formulas: vfb=^l= dt Ιαιΐ) (3) VoutrVfb = L2: L1 vfb=Mv〇ut (4) From equation (4), the user can measure the second end of the battery. Whether A2 reaches the cold cathode fluorescent tube = and the current of the series, and then determines whether the backlight unit is operating normally.

Figure 1 shows a circuit diagram in accordance with a second embodiment of the present invention. Referring to FIG. 3, in the backlight unit provided in this embodiment, there are a plurality of cold cathode fluorescent lamps, for example, 332 and 334 test ports 336. Therefore, the transformers 31A, 312 and the plurality of secondary sides 314, 316, ..., 318 used in the backlight unit 300. The primary side 312 of the transformer 310 receives the pulse width modulation signal Vp, and each of the secondary sides 314, 316, ... 318 is electrically connected to one of the cold cathode fluorescent tubes. Thereby, the transformer 310 can drive the cold cathode fluorescent lamps 332-336 according to the pulse width modulation signal VP. In this embodiment, the structure of each secondary side 314, 316, 318, 318 is the same as that of the secondary side 214 in the first embodiment, and those having ordinary knowledge in this field should be able to analogize themselves. This will not be repeated here. Since the structure of each of the secondary sides 314, 316, ... 318 is the same as that of the secondary side circuit 214 in the first embodiment, the user can measure the voltages Vfb-1, Vfb-2 in FIG. ·.., Vfb-n, to know each cold yin 11 < S ) 1360795 0610064ITW 20911twf.doc / n = light tube madness New parameters, such as jade electricity l 妓 working current 笫 three examples in a certain At some point, the user needs to measure a variety of different operating characteristics of the cold cathode fluorescent tube at the same time. Because the other light unit is provided. In the embodiment of the present invention, a circuit diagram of a backlight unit according to a third embodiment of the present invention is provided. As shown in FIG. 4, in the backlight unit 400, a second transformer 412 and a secondary side of the secondary side 412 are also included to receive the pulse width modulation signal Vp. ==, the secondary side 414 of the viewer has a first m, a younger terminal A2, and a plurality of measuring terminals 1VQ, M2 'M3.··, Mn. In this practical example, the first end... is grounded, and the first μΓμΓμ^ is off, the amount is eight τ, the bat A1 to each of the tears, the 1 azole M2, the M3··., the Mn, and the first end A1 to The second end A2 will have different inductance values. Thereby, the user can measure the voltages Vfb-1, Vfb-2, and An extremely different from the mother η, especially πη' while knowing the coldness and self-referencing the description in the first embodiment. The original TU fourth capital application% 12 1360795

0610064ITW 20911twf.doc/n FIG. 5 is a circuit diagram of a backlight unit in accordance with a fourth embodiment of the present invention. Referring to FIG. 5, the backlight unit 500 is similar to the backlight unit 300 of the second embodiment, and has a plurality of cold cathode fluorescent tubes 532, 534.., 536. In addition, the backlight unit 500 also has a transformer 51A having a primary side 512 and a plurality of secondary sides 514, 516, . . . , 518. Therefore, the primary side 512 疋 is used to receive the pulse width modulation signal Vp, and each of the secondary sides 514, 516, . . . , 518 is electrically connected to one of the cold cathode fluorescent tubes 532, 534. ·, 536. The difference between the backlight unit 500 and the backlight unit 300 is that in the backlight unit 500, the structure of each of the secondary sides 514, 516, ... 518 is the same as that of the third, secondary side 414 in the embodiment. Therefore, the user can know the working hiding parameter of the corresponding cold cathode fluorescent tube according to the measured voltage measured by each secondary side. For example, the user can measure the voltages Vfb-H, Vfb_12, Vfb_13... generated by the side 514,

Vfb-ln, and it is known that the cold cathode fluorescent lamp 532 is an operating characteristic parameter such as an operating voltage and a working current. In summary, because the measurement side is to be formed on the secondary side, =nr亍 is a performance, and on the technical level, the invention does not require expensive hardware costs, so that the work can be carried out in advance. Characteristic parameters. Although the present invention has been disclosed in accordance with the preferred embodiments of the present invention, any skilled person skilled in the art will be able to make changes and refinements without departing from the hair. Apply for special _ define the scales. ', thin 13 1360795 0610064ITW 20911twf.doc / n [Simple diagram of the drawing] Figure 1 shows a circuit diagram of a conventional backlight unit. 2 is a circuit diagram of a backlight unit in accordance with a first embodiment of the present invention. 3 is a circuit diagram of a backlight unit in accordance with a second embodiment of the present invention. 4 is a circuit diagram of a backlight unit in accordance with a third embodiment of the present invention. Figure 5 is a circuit diagram of a backlight unit in accordance with a fourth embodiment of the present invention. [Description of Main Component Symbols] 100, 200, 300, 400, 500: Backlight Unit 102: Pulse Width Modulation (PWM) Units 104, 222, 332, 334, 336, 432, 532, 534, 536: Cold Cathode Fluorescence Lamps 106, 210, 310, 410, 510: Transformers # 108, 212, 312, 412, 512: - Secondary side 110, 214, 314, 316, 318, 414, 514, 516, 518: Secondary side - 112 , 114, 116 : External circuit " A1 . First end A2 · Second end CU , C2 : Capacitor la , lb : Current 1360795 0610064ITW 20911twf.doc / n I , Id : Drive signal U , L2 : Inductance value

Ml, M2, Μ3·", Μη: measuring end R1, R2: resistance

Vf: feedback signal

Vfb, Vfb-1, Vfb-2..., Vfb-n, Vfb-ΙΙ~Vfb-ln: measuring voltage

Vp: Pulse width modulation signal Vout: What is the output power?

15

Claims (1)

1360795 0610064ITW 20911twf.doc/n X. Patent application scope: 1. A transformer suitable for a backlight unit having a primary side and a secondary side, and the transformer is characterized in that the secondary side has: a first end; a measuring end having a first-inductance value and a second end between the first end and a second inductance value between the first end and the first end. a backlight unit comprising: a light source; and a transformer having a secondary side and a secondary side, wherein the primary side has a 2-pulse width modulation signal, and the secondary side has a first end, a a measuring end, wherein the first end is grounded, and the measuring end and the first end have an -I inductance value, and the second end has a second inductance value between the second end and the first end, wherein The measurement voltage measured by the measurement terminal is used to represent the operating characteristic parameter, and the second terminal output-drive signal is used to drive the light source to emit light. 3. If the backlight unit described in the second application of the patent application is further provided, the width modulation unit is used to generate the pulse width modulation signal. 4. The backlight unit of claim 2, wherein / is originally a cold cathode fluorescent lamp. μ 5· As described in item 4 of the scope of claim, the end of the diode lamp is electrically connected to the terminal. - 乐一柒, another 6. The backlight unit according to claim 2, wherein the work 0610064ITW 20911twf.doc/n is a characteristic parameter for the work of the light source, "the pressure and the operating current" 7. A backlight unit comprising: a plurality of light sources; Connecting the light sources to the -, and each: the secondary sides, respectively, the electrical end, the measuring end and the second end 丨 have a - the first end and the first end have a - first end grounding, the Measured between the opposite ends has a -second inductance value /, and the second end and the first one is measured - the measured voltage is the second: the ship characteristic parameter ' - The second dance, the signal m drives the corresponding light source to emit light. 8. If the backlight unit sold in the 7th section of the section is more than a wide variable, a single d is generated to generate the pulse width modulation signal. A changer has a primary side, such as a secondary side receiving-pulse width modulation signal, and: a plurality of secondary sides, wherein one of the readings, the day a, the secondary sides are respectively 9 The backlight unit of the seventh aspect of the invention, wherein the side light source is a cold cathode fluorescent tube. 10. The backlight unit of claim 9, wherein an end of each of the cold cathode fluorescent tubes is electrically connected to a second end of the secondary side and the other end is grounded. 11. The backlight unit of claim 7, wherein the characteristic parameter of each of the light sources is one of a voltage and an operating current of each of the light sources. 12. The transformer is suitable for a backlight unit having a secondary side and 17 < S > 0610064ITW 20911twf.doc/n a primary side, and the transformer is characterized in that the secondary side has a first end, a second end and a plurality of measuring ends, wherein each of the measuring ends and the second end and the first end have different inductance values. 13. A backlight unit, comprising: a light source; and a transformer having a primary side and a secondary side, wherein the primary side receives a pulse width modulation signal and the secondary side has a first end, a The second = and the imaginary I measuring end, wherein the first end is grounded, and each of the measurements and the inductance value between the second end and the first end are not phase I5J > θ \ 〃, the mother measures the different measured voltages measured by the measuring terminals, and the other uses the different characteristic parameters of the light source, and the driving signal from the second round is used to drive the The light source emits light. The backlight unit described in Item 13 of the pulse further has a wide adjustment k early 7G for generating the pulse width modulation signal. 15. The backing described in item 13 of the patent application is originally a cold cathode fluorescent tube. Cold application special (4) 15 of the backlight material, re-payment for the extremely fluorescent tube - the end of the electrical connection ^ " ~ end is grounded. (10) material-end, another I7·, as described in claim 15 of the patent application park, the apricot-light source two work parameters include the work of the light source; make = the 18. a backlight unit, including: machine. Most of the light sources; and 1360795 0610064ITW 20911tw£doc/n, a Wei device '昊有—(10) and money twice _, which = side receiving - pulse width modulation signal, and each of these points is electric = connection = Light = _, and each - the secondary side:: should be between the second end and the first end of the 4;, the amount of electricity: each of the measured end of the amount _ non-polar parameters And each of the different light sources of the corresponding light source is used to drive the driving signal corresponding to the second end of the corresponding first side to be the backlight unit of the pulse 18, which has 2 turns, ^ The pulse width modulation signal is generated. Wu Guangyuan is the backlight unit of the cold item, (4), the fan, and the backlight unit of item 20, wherein each of the continuation of the first end is connected to the secondary side of the lamp-to-terminal electrical connection. The other end is grounded. The backlight unit according to item 18, wherein each of the current and work characteristic parameters includes the operating voltage of the light sources and 19 c S >