CN102026459B - Drive circuit of cold-cathode fluorescence lamp - Google Patents
Drive circuit of cold-cathode fluorescence lamp Download PDFInfo
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- CN102026459B CN102026459B CN2009101778122A CN200910177812A CN102026459B CN 102026459 B CN102026459 B CN 102026459B CN 2009101778122 A CN2009101778122 A CN 2009101778122A CN 200910177812 A CN200910177812 A CN 200910177812A CN 102026459 B CN102026459 B CN 102026459B
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Abstract
The invention provides a drive circuit of a cold-cathode fluorescence lamp. The drive circuit of the cold-cathode fluorescence lamp is characterized in that a first end of each U-shaped cold-cathode fluorescence lamp is coupled to a second end of one first balance capacitor; a second end of each U-shaped cold-cathode fluorescence lamp is coupled to a second end of one second balance capacitor; then first ends of all first balance capacitors are coupled together to receive first sine wave alternating-current voltage generated by matching a first boosting transformer with a first resonance circuit; and first ends of all the second balance capacitors are coupled together to receive second sine wave alternating-current voltage generated by matching a second boosting transformer with a second resonance circuit. Therefore, a boosting plate is not needed, and the drive structure is simple.
Description
Technical field
The invention relates to a kind of backlight driver technology, particularly about a kind of drive circuit of cold-cathode fluorescence lamp that is applicable to the large scale liquid crystal display.
Background technology
The backlight of existing large scale liquid crystal display mainly contains two kinds, a kind of is by many U-shaped cathode fluorescent tubes (Cold Cathode Fluorescent Lamp, referred to as CCFL) arrange the direct-light-type backlight form, another kind is to arrange by many external electrode fluorescent lamp pipes (External Electrode Fluorescent Lamp, referred to as EEFL) direct-light-type backlight formed.
The circuit diagram that Fig. 1 is a kind of existing CCFL drive circuit.Referring to Fig. 1, the CCFL drive circuit is located on power panel (power board) 11 and the plate that boosts (boost board) 12, and in order to drive backlight 13, and backlight 13 comprises many U-shaped CCFL 131～13N, and N is positive integer.Be provided with bridge rectifier 111, merit because of corrector (power factor corrector) 112, half-bridge/full-bridge converter (inverter) 113 and first order transformer Tr1 on power panel 11.Be provided with a plurality of second level transformer Tr2 and and the corresponding resonant circuit of each second level transformer Tr2 (being formed by resonant inductor Lk and resonant capacitor Cp) on the plate 12 that boosts.Wherein, the turn ratio of first order transformer Tr1 and second level transformer Tr2 primary side and secondary side winding is all for example 1: n, n is positive integer, therefore first order transformer Tr1 and second level transformer Tr2 are step-up transformers, and resonant inductor Lk can be provided by the secondary side leakage inductance of second level transformer Tr2 usually in addition.
The electric main AC of input is by after bridge rectifier 111, and its voltage can become direct voltage, but its current waveform can produce distortion, therefore usually also needs to repair its current waveforms to meet the harmonic current standard by merit because of corrector 112.Then, direct voltage becomes the alternating voltage (or being called square wave alternating-current voltage) of square wave form by the half-bridge/switching of full-bridge converter 113, square wave alternating-current voltage is divided on the second level transformer Tr2 first side winding of serial connection by after the boosting of first order transformer Tr1 again.Then, each second level transformer Tr2 is by become the alternating voltage (or being called string alternating current wave pressure) of string waveshape after the boost in voltage of assigning on first side winding by the resonance of resonant circuit, to drive CCFL again.It should be noted that every U-shaped CCFL need to produce two string alternating current waves with phase difference 180 degree by two second level transformer Tr2 and press to drive, so N root CCFL 131～13N needs (2 * N) individual second level transformer Tr2 to drive altogether.
The circuit diagram that Fig. 2 is a kind of existing EEFL drive circuit.Referring to Fig. 2, the EEFL drive circuit is located at power panel 21, and in order to drive backlight 23, and backlight 23 comprises many EEFL 231 and 232, and wherein EEFL 231 is connected in parallel, and EEFL 232 is connected in parallel.Be provided with bridge rectifier 111, merit because of corrector 112, half-bridge/full-bridge converter 113, the transformer Tr21 with a first side winding and two secondary side winding and and the corresponding resonant circuit of each secondary side winding of transformer Tr21 (being formed by resonant inductor Lk and resonant capacitor Cp) on power panel 21.Wherein, the turn ratio of transformer Tr21 primary side and secondary side winding is 1: m, and m is positive integer, therefore transformer Tr21 is step-up transformer, resonant inductor Lk can be provided by the secondary side leakage inductance of transformer Tr21 usually in addition.
The electric main AC of input becomes square wave alternating-current voltage by rectification, the merit of bridge rectifier 111 because of the current waveform finishing of corrector 112, the switching of half-bridge/full-bridge converter 113.Square wave alternating-current voltage again by after the boosting of transformer Tr21 from two square wave alternating-current voltages with phase difference 180 degree of two secondary side winding output, then the resonant inductor Lk coupled separately by two secondary side winding and the resonance of resonant capacitor Cp become two string alternating current waves with phase difference 180 degree presses, to drive respectively EEFL231 in parallel and EEFL 232 in parallel.
EEFL drive circuit shown in CCFL drive circuit shown in comparison diagram 1 and Fig. 2, need to the boost second level transformer Tr2 of plate 12 and resonant circuit of CCFL drive circuit helps to drive CCFL, and in order to make the luminance difference after each root CCFL lights little, every CCFL needs two second level transformer Tr2 and corresponding resonant circuit thereof to light separately, therefore when backlight 13 needs more CCFL, more second level transformer Tr2 and resonant circuit just need to be set on the plate 12 that boosts.Although the EEFL drive circuit produces plasma because EEFL adopts the outer electrode mode, make the luminance difference after each root EEFL lights little, be applicable to by transformer Tr21, being driven together after many EEFL parallel connections, drive circuit structure is comparatively simple, but uses the cost ratio of the backlight 23 of EEFL to use the backlight 13 of CCFL expensive.
Summary of the invention
In view of this, purpose of the present invention is exactly to be to provide a kind of drive circuit of cold-cathode fluorescence lamp that is applicable to the large scale liquid crystal display, its use be the U-shaped cathode fluorescent tube (CCFL) that cost ratio external electrode fluorescent lamp pipe (EEFL) is cheap, but do not need the complicated drive circuit structure of use as described in background technology to drive.
In order to reach above-mentioned purpose and other purpose, the present invention proposes a kind of drive circuit of cold-cathode fluorescence lamp, in order to drive many U-shaped cathode fluorescent tubes.Drive circuit of cold-cathode fluorescence lamp comprises a bridge rectifier, a half-bridge or full-bridge converter, one first step-up transformer, one second step-up transformer, one first resonant circuit, one second resonant circuit, a plurality of the first balanced capacitor and a plurality of the second balanced capacitor.Bridge rectifier is in order to receive electric main and it is changed into to direct voltage.Half-bridge or full-bridge converter are coupled to bridge rectifier, in order to the direct voltage that receives bridge rectifier output and it is changed into to square wave alternating-current voltage.The first step-up transformer and the second step-up transformer all have first side winding and secondary side winding, first side winding and secondary side winding are wound in shaped iron core on the one, day shaped iron core has a newel and two side columns, wherein secondary side winding is around the newel coiling, and first side winding is around newel and arbitrary side column coiling.The first side winding of the first step-up transformer and the second step-up transformer is connected in series and is connected across the output of half-bridge or full-bridge converter and presses with recipient's alternating current wave.The first resonant circuit is coupled to the secondary side winding of the first step-up transformer, the second resonant circuit is coupled to the secondary side winding of the second step-up transformer, the first resonant circuit and the second resonant circuit are exported respectively first string alternating current wave pressure and the second string alternating current wave is pressed, and the first string alternating current wave is pressed and the second string alternating current wave is pressed phase difference 180 degree.The first end of each the first balanced capacitor is couple to the first resonant circuit and presses to receive the first string alternating current wave, and the second end of each the first balanced capacitor is couple to respectively the first end of corresponding U-shaped cathode fluorescent tube.The first end of each the second balanced capacitor is couple to the second resonant circuit and presses to receive the second string alternating current wave, and the second end of each the second balanced capacitor is couple to respectively the second end of corresponding U-shaped cathode fluorescent tube.
In one embodiment, bridge rectifier, half-bridge or full-bridge converter, the first step-up transformer, the second step-up transformer, the first resonant circuit and the second resonant circuit are located on power panel.The first balanced capacitor and the second balanced capacitor all are located on balance plate.
Drive circuit of cold-cathode fluorescence lamp of the present invention, the first end of every U-shaped cathode fluorescent tube is coupled to the second end of first balanced capacitor, the second end of every U-shaped cathode fluorescent tube is coupled to the second end of second balanced capacitor, then the first end of all the first balanced capacitors is coupled in to the first string alternating current wave pressure that coordinates the first resonant circuit to be produced to receive the first step-up transformer together, the first end of all the second balanced capacitors is coupled in the second string alternating current wave pressure that coordinates the second resonant circuit to be produced to receive the second step-up transformer together, therefore needn't be as the cathode fluorescent tube in background technology (CCFL) drive circuit, need to add the plate that boosts, and the number transformer on it increases along with the increase of fluorescent tube quantity, but can be the same with external electrode fluorescent lamp pipe (EEFL) drive circuit in background technology, use comparatively simple Drive Structure.In addition, step-up transformer strengthens between its first side winding and secondary side winding two windings gap and/or strengthens the every MLT mean length of turn of its first side winding by special winding method, to obtain larger secondary side leakage inductance, and then only with first and second step-up transformer, enough drive many U-shaped cathode fluorescent tubes.
For above and other objects of the present invention, feature and advantage can be become apparent, below with specific embodiment, and by reference to the accompanying drawings, elaborate.
The accompanying drawing explanation
The circuit diagram that Fig. 1 is a kind of existing CCFL drive circuit.
The circuit diagram that Fig. 2 is a kind of existing EEFL drive circuit.
The circuit diagram of the CCFL drive circuit that Fig. 3 is one embodiment of the invention.
The structural representation that Fig. 4 is the step-up transformer in the CCFL drive circuit shown in Fig. 3.
The circuit diagram of the transformer that Fig. 5 is CCFL drive circuit shown in Fig. 3, resonant circuit, balanced capacitor, stray capacitance and CCFL.
In accompanying drawing, the list of parts of each label representative is as follows:
11,21,31: power panel
111: bridge rectifier, 112: merit is because of corrector, and 113: half-bridge/full-bridge converter
12: plate boosts
13,23: backlight
131～13N:U type cathode fluorescent tube (CCFL)
231,232: external electrode fluorescent lamp pipe (EEFL)
32: balance plate
4: day shaped iron core
41,42:E shaped iron core
411,421: newel
412,413,422,423: side column
43: air gap
AC: electric main
Cf1: fluorescent tube capacitor
Ck: stray capacitance
Cp, Cp1, Cp2: resonant capacitor
Cs1: the first balanced capacitor, Cs2: the second balanced capacitor
Df1, Df2: fluorescent tube Zener diode
Lk, Lk1, Lk2: resonant inductor
Rf1: fluorescent tube resistor
Tr1: first order transformer
Tr2: second level transformer, Tr21: transformer
Tr31: the first step-up transformer, Tr32: the second step-up transformer
P1, P2: first side winding
S1, S2: secondary side winding
I1: first side winding electric current, I2: secondary side winding electric current
N1: the first side winding number of turn, N2: the secondary side winding number of turn
B: first side winding accounts for the coiling window height
C: gap between first side winding and secondary side winding
D: secondary side winding accounts for the coiling window height
Len1, L: first side winding accounts for the coiling window width
Len2: secondary side winding accounts for the coiling window width
V1: the first string alternating current wave is pressed, V2: the second string alternating current wave is pressed
Embodiment
For the purpose, technical solutions and advantages of the present invention more can be become apparent, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The circuit diagram of the CCFL drive circuit that Fig. 3 is one embodiment of the invention.Referring to Fig. 3, the CCFL drive circuit is located on power panel 31 and balance plate (balance board) 32, and in order to drive backlight 13, and backlight 13 comprises many U-shaped CCFL 131～13N, and N is positive integer.Be provided with bridge rectifier 111, merit because of corrector 112, converter 113, the first step-up transformer Tr31, the second step-up transformer Tr32, the first resonant circuit (being comprised of resonant inductor Lk1 and resonant capacitor Cp1) and the second resonant circuit (being comprised of resonant inductor Lk2 and resonant capacitor Cp2) on power panel 31, wherein converter 113 is for example half-bridge converter or full-bridge converter.Be provided with a plurality of the first balanced capacitor Cs1 and a plurality of the second balanced capacitor Cs2 on balance plate 32.
The first step-up transformer Tr31 has first side winding P1 and secondary side winding S1, and first side winding P1 and secondary side winding S1 are wound in a day shaped iron core.In one embodiment, as shown in Figure 4, a day shaped iron core 4 is comprised of E shaped iron core 41 and E shaped iron core 42, but not as limit; For example, a day shaped iron core also can be comprised of E shaped iron core and I shaped iron core, or is comprised of C shaped iron core and T-shaped iron core.Day shaped iron core 4 has newel and two side columns, the newel of day shaped iron core 4 is comprised of the newel 411 of E shaped iron core 41 and the newel 421 of E shaped iron core 42, day, one side column of shaped iron core 4 was comprised of the side column 412 of E shaped iron core 41 and the side column 422 of E shaped iron core 42, and another side column of day shaped iron core 4 is comprised of the side column 413 of E shaped iron core 41 and the side column 423 of E shaped iron core 42.The secondary side winding S1 of the first step-up transformer Tr31 is in the present embodiment around newel 411 coilings, and first side winding P1 is in the present embodiment around newel 421 and side column 422 coilings.Wherein, the turn ratio of the first step-up transformer Tr31 first side winding P1 and secondary side winding S1 is for example 1: n, n is positive integer.In addition, the second step-up transformer Tr32 has first side winding P2 and secondary side winding S2 equally, and first side winding P2 and secondary side winding S2 are wound in a day shaped iron core, and its winding method is identical with the first step-up transformer Tr31, repeats no more.
The first side winding P2 of the first side winding P1 of the first step-up transformer Tr31 and the second step-up transformer Tr32 is connected in series and is connected across the output of half-bridge/full-bridge converter 113, with recipient's alternating current wave, presses.The secondary side winding S1 of the first step-up transformer Tr31 is coupled to the first resonant circuit, and the secondary side winding S2 of the second step-up transformer Tr32 is coupled to the second resonant circuit, wherein, resonant inductor Lk1 in the first resonant circuit can be provided by the secondary side leakage inductance of the first step-up transformer Tr31 usually, and the resonant inductor Lk2 in the second resonant circuit can be provided by the secondary side leakage inductance of the second step-up transformer Tr32 usually.The first step-up transformer Tr31 is by after the boost in voltage of assigning on its first side winding P1, resonance by the first resonant circuit becomes first string alternating current wave pressure V1 output again, and the second step-up transformer Tr32 is after the boost in voltage of assigning on its first side winding P2, then the resonance by the second resonant circuit becomes the second string alternating current wave and presses V2 output.Because the secondary side winding S2 polarity of the secondary side winding S1 of the first step-up transformer Tr31 and the second step-up transformer Tr32 is contrary, make the first string alternating current wave that the first resonant circuit and the second resonant circuit are exported respectively press V1 and the second string alternating current wave to press V2 phase difference 180 degree.
The first end of each the first balanced capacitor Cs1 is couple to the first resonant circuit and presses V1 to receive the first string alternating current wave, and the second end of each the first balanced capacitor Cs1 is couple to respectively the first end of corresponding U-shaped CCFL.The first end of each the second balanced capacitor Cs2 is couple to the second resonant circuit and presses V2 to receive the second string alternating current wave, and the second end of each the second balanced capacitor Cs2 is couple to respectively the second end of corresponding U-shaped CCFL.The U-shaped CCFL 131 of take is example, the first end of CCFL 131 is couple to the first string alternating current wave by the first balanced capacitor Cs1 and presses V1, the second end of CCFL 131 is couple to the second string alternating current wave by the second balanced capacitor Cs2 and presses V2, so CCFL 131 presses V1 and the second string alternating current wave to press the V2 cooperation to drive by the first string alternating current wave of phase difference 180 degree.
Referring to Fig. 4, the first step-up transformer Tr31 of below take estimates its secondary side leakage inductance Lk1 as example.The first side winding P1 number of turn of now establishing the first step-up transformer Tr31 is that N1 and electric current are I1, and the secondary side winding S1 number of turn is that N2 and electric current are I2, N1 * I1=N2 * I2, wherein N1: N2 is illustrated in figure 31: n.In addition, establish first side winding P1 account for the coiling window height be that b and width are len1, secondary side winding S1 account for the coiling window height be that d and width are len2, between first side winding P1 and secondary side winding S1 two windings, gap is c.Because the shared coiling window width of first side winding P1 len1 is usually also large than the shared coiling window width of secondary side winding S1 len2, for convenience of calculation, establish len1=L, len2=(1/2) * L.Being stored in the magnetic field energy Wm that is not transmitted of coiling window is the energy We that is input to leakage inductance,
Wm＝We (1)
The magnetic field energy Wm be not transmitted that the coiling window stores comprises that the magnetic field energy Wb contributed by first side winding P1, the magnetic field energy Wc contributed by gap between two coils reach the magnetic field energy Wd by secondary side winding S1 contribution,
Wm＝Wb+Wc+Wd (2)
The computational methods that provide according to document can push away,
Wb＝[μ0×lav1×b×(N1×I1)
2]/(6×L) (3)
Wc＝[μ0×lav3×c×(N1×I1)
2]/(4×L) (4)
Wd＝[μ0×lav2×d×(N2×I2)
2]/(3×L) (5)
Wherein, the magnetic capacity that μ 0 is air, lav1, lav2 and lav3 are respectively every MLT mean length of turn in gap between first side winding P1, secondary side winding S1 and two windings.Formula (3)～(5) are updated to formula (2), and the magnetic field energy Wm be not transmitted that the window that winds the line stores is
Wm＝[μ0×lav1×b×(N1×I1)
2]/(6×L)+[μ0×lav3×c×(N1×I1)
2]/(4×L)+[μ0×lav2×d×(N2×I2)
2]/(3×L) (6)
In addition, leakage inductance energy We is
We＝(1/2)×Lk1×I2
2＝Wm (7)
Formula (6) is updated to formula (7), considers N1 * I1=N2 * I2, can push away to such an extent that secondary side leakage inductance Lk1 is
Lk1＝μ0×N2
2/L×[(1/3)×lav1×b+(1/2)×lav3×c+(2/3)×lav2×d](8)
From formula (8), secondary side leakage inductance Lk1 and N2 square are directly proportional, and with L, are inversely proportional to, and to the linear combination of lav1 * b, lav3 * c and lav2 * d, are directly proportional.The present invention is by strengthening gap c and/or the every MLT mean length of turn lav1 of increasing step-up transformer first side winding between step-up transformer first side winding and secondary side winding two windings, to obtain larger secondary side leakage inductance, and then only with two step-up transformer Tr31 and Tr32, enough drive many U-shaped CCFL 131～13N as shown in Figure 3.
Referring to Fig. 5, the circuit diagram of its transformer that is CCFL drive circuit shown in Fig. 3, resonant circuit, balanced capacitor, stray capacitance and CCFL.The equivalent electric circuit of CCFL is as shown in CCFL in Fig. 5 131, and it comprises fluorescent tube capacitor Cf1, fluorescent tube Zener diode Df1, Df2 and fluorescent tube resistor Rf1.Present infinitely-great impedance when CCFL does not light, be the resistive impedance of a negative electricity after lighting.After CCFL 131 is placed in display, it can produce stray capacitance with the inner support iron-clad part of display, as shown in stray capacitance Ck in Fig. 5, therefore the present invention utilizes a capacitance to be serially connected with between the first resonant circuit and CCFL 131 much smaller than the first balanced capacitor Cs1 of stray capacitance Ck, can eliminate CCFL 131～13N because stray capacitance Ck causes the uneven problem of the size of current flow through each other.
In sum, drive circuit of cold-cathode fluorescence lamp of the present invention by the first end of every U-shaped cathode fluorescent tube be coupled to first balanced capacitor the second end, the second end of every U-shaped cathode fluorescent tube is coupled to the second end of second balanced capacitor, then the first end of all the first balanced capacitors is coupled in together to the first string alternating current wave pressure that coordinates the first resonant circuit to be produced to receive the first step-up transformer; The first end of all the second balanced capacitors is coupled in together, the the second string alternating current wave pressure that coordinates the second resonant circuit to be produced to receive the second step-up transformer, therefore needn't be as the cathode fluorescent tube in background technology (CCFL) drive circuit, need to add boost plate and the number transformer on it to increase along with the increase of fluorescent tube quantity, but can be the same with external electrode fluorescent lamp pipe (EEFL) drive circuit in background technology, use comparatively simple Drive Structure.In addition, step-up transformer strengthens between its first side winding and secondary side winding two windings gap and/or strengthens the every MLT mean length of turn of its first side winding by special winding method, to obtain larger secondary side leakage inductance, and then only with first and second step-up transformer, enough drive many U-shaped cathode fluorescent tubes.
The foregoing is only preferred embodiment of the present invention, not thereby limit the scope of the claims of the present invention.Any modification that every utilization specification of the present invention and accompanying drawing content are done, be equal to replacement, improvement etc., or directly or indirectly be used in other relevant technical field, all in like manner be included in protection scope of the present invention.
Claims (4)
1. a drive circuit of cold-cathode fluorescence lamp, in order to drive many U-shaped cathode fluorescent tubes, is characterized in that, described drive circuit of cold-cathode fluorescence lamp comprises:
One bridge rectifier, in order to receive an electric main and it changed into to a direct current voltage;
One half-bridge or full-bridge converter, be coupled to described bridge rectifier, in order to receive described direct voltage and it is changed into to a square wave alternating-current voltage;
One first and one second step-up transformer, all there is a first side winding and a secondary side winding and be wound in the shaped iron core on the one with a newel and two side columns, described secondary side winding is around described newel coiling, described first side winding is around described newel and arbitrary side column coiling, described first and the first side winding of described the second step-up transformer be connected in series and be connected across the output of described half-bridge or full-bridge converter to receive described square wave alternating-current voltage;
One first and one second resonant circuit, wherein said the first resonant circuit is coupled to the secondary side winding of described the first step-up transformer, described the second resonant circuit is coupled to the secondary side winding of described the second step-up transformer, described first and described the second resonant circuit export respectively one first and one second string alternating current wave and press, described first and described the second string alternating current wave press phase difference 180 degree;
A plurality of the first balanced capacitors, wherein the first end of each the first balanced capacitor is couple to described the first resonant circuit to receive described first string alternating current wave pressure, and the second end of each the first balanced capacitor is couple to respectively the first end of corresponding U-shaped cathode fluorescent tube; And
A plurality of the second balanced capacitors, wherein the first end of each the second balanced capacitor is couple to described the second resonant circuit to receive described the second string alternating current wave pressure, and the second end of each the second balanced capacitor is couple to respectively the second end of corresponding U-shaped cathode fluorescent tube;
The capacitance of the stray capacitance that wherein, the capacitance of each first and second balanced capacitor produces much smaller than the inner support iron-clad part of corresponding U-shaped cathode fluorescent tube and described display.
2. drive circuit of cold-cathode fluorescence lamp as claimed in claim 1, it is characterized in that, wherein said bridge rectifier, described half-bridge or full-bridge converter, described first and described the second step-up transformer, described first and described the second resonant circuit be located on a power panel.
3. drive circuit of cold-cathode fluorescence lamp as claimed in claim 1, is characterized in that, wherein said the first balanced capacitor and described the second balanced capacitor are located on a balance plate.
4. drive circuit of cold-cathode fluorescence lamp as claimed in claim 1, is characterized in that, also comprises that a merit is because of corrector, is coupled between described bridge rectifier and described half-bridge or full-bridge converter, in order to repair the current waveform of described bridge rectifier output.
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| CN2009101778122A CN102026459B (en) | 2009-09-21 | 2009-09-21 | Drive circuit of cold-cathode fluorescence lamp |
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|---|---|---|---|
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| CN101203079A (en) * | 2006-12-12 | 2008-06-18 | 台达电子工业股份有限公司 | Multiple lamp tube driving system and flow equalizing circuit thereof |
| US7663322B2 (en) * | 2007-07-20 | 2010-02-16 | Samsung Electro-Mechanics Co., Ltd. | Backlight driving system for liquid crystal display |
| CN201197215Y (en) * | 2008-02-03 | 2009-02-18 | 达方电子股份有限公司 | Current balancing apparatus and multi-light tube backlight module |
| CN201256475Y (en) * | 2008-09-12 | 2009-06-10 | 冠捷投资有限公司 | Multiple lamp tube driving circuit |
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