TWI258726B - High voltage lamp driving method and circuit thereof - Google Patents

Abstract

A high voltage lamp driving method and circuit thereof is disclosed. The circuit includes a first transformer for delivering a first AC driving signal to one end of a lamp and a second transformer for delivering a second AC driving signal to the one end of a lamp. The first and second driving signals have a predetermined phase difference. The circuit enables the lamp illuminating uniformly and reduces the endurant voltage of the peripheral components. The inability of the endurance of the peripheral components is enhanced and the safety distance is also improved.

Description

1258726 Become a household electric steel, home appliances Wei rate. The liquid crystal display of the panel allows the bright feedback resistor 5 彳 or the bright and dark voltage to be displayed. The TV-based air conditioners that are easy to have this part need to be invested in the key technology of the TV. Therefore, the important factor is to use the fluorescent tube in the south, that is, the activity of the pole is lower than the activity of the ring. The cold cathode technology in the Dazhi light-resistant module adopts a single-point driving method. The electrode points the south voltage 'the other power, and the other end is connected to the brightness unevenness. When the difference between the high and the dark is longer, the component and the peripheral parts are more suitable. Use. The drive circuit, especially one applied to the double high pressure lamp drive circuit. V. DESCRIPTION OF THE INVENTION (1) The prior art of the present invention is a liquid crystal display device. A display device for a liquid crystal display device, such as a computer manufactured by an electric lead, is used to expand the brightness of the liquid crystal display module. It is also the use of the inductive display. In the back, the voltage of the tube is weak. Therefore, the length of the bright tube is high-voltage and the output is high. The technical field is that the lamp in the backlight module has been used.曰夯成疋 refrigerator, quotient and market occupies in addition to lighting LCD display, as a trend display device, no, or application, etc., its huge and large resources to push outside, it needs to use optical modules Liangzhu. In addition, in order to match the brightness and uniformity, the drive circuit in the middle says the voltage of the two electrodes. This type of electric drive is easy, mainly strong, when the temperature is low near low or. In addition, the driving voltage is subjected to stress. The other market is related to the backlight and the stable and large-sized multi-lamp. One of the well-known ones makes the cold cathode. Because the lamp terminal is cooler than the cold cathode circuit, the limit is limited.

Page 6 1258726 V. Description of the invention As this is because of the unevenness of the indication area, it is to be solved: in the invention, in view of the problem of the high-pressure lamp, the method is moved to the other end of the lamp (2) The large size shows the expected problem, and how to make the technical problem accommodate the above-mentioned question driving method or shortcoming. In order to achieve the above objective, the dual high voltage lamp tube drive disclosed in the present invention is used to drive a lamp tube, and a first AC drive signal and a second AC drive signal are respectively input to the lamp to emit light, wherein the first AC drive The increase in the brightness of the indicator. The impact of the display of the lamp, the hair and its drive, highlights the need to use long and long lamps in the display of the drive to evenly illuminate the main eye, so that the technical problems. The lamp is designed to make it easier to produce bright light throughout the display. The illuminating, the entanglement of the present invention is to provide a double solution to the prior art and the first end of the tube and the input lamp uniform signal have a predetermined to drive the AC drive for the above purpose, the circuit disclosed by the present invention, A device is included for outputting a first voltage device for outputting a phase difference of the first parent flow driving. The circuit according to the present invention and its circuit have a principle that the phase difference is across the tube. The dual high voltage lamp is driven by the first transformer and a second transformer. The first AC drive two parent flow drive signals and the principle, the lamp uniform electrode is one end of the tube, the other one of the lamp is transformed, the second change signal to the light signal to the second AC drive signal has a predetermined end. The dual high voltage driving method disclosed in the invention has the advantage of illuminating. Giving a high voltage having a predetermined phase difference according to the present invention

Page 7 1258726 V. Description of invention (3) AC signal to improve the cold cathode tube may cause excessive difference in brightness between the high voltage and low voltage of the lamp due to changes in ambient temperature or assembly, body, mechanism, etc., even bright and dark Half of the situation happened. In accordance with the principles of the present invention, the dual high voltage driving method and circuit thereof disclosed herein have the advantage of reducing the maximum voltage experienced by the component. In accordance with the principles of the present invention, the present invention can reduce the maximum withstand voltage of the peripheral components of the drive circuit to address the low voltage withstand capability of peripheral components, improve the safe distance of the ambient environment withstand voltage, and increase the selection of high voltage components. The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description. It is understood from the contents disclosed in the specification, the scope of the application, and the drawings. The above description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the principles of the invention. [Embodiment] The features and implementations of the present invention are described in detail with reference to the preferred embodiments. Please refer to FIG. 1 for the circuit diagram of the double high voltage lamp driving circuit disclosed in the present invention. As shown, a pulse width modulation (PWM) controller 10, a first transformer T1, and a second transformer T2 are included. The pulse width modulation controller 10 is configured to output a driving signal, and the driving signal is boosted by the first transformer T1 and the second transformer T2 to drive the lamp

1258726 V. Description of the invention (4) 2 0, so that the lamp 20 can emit light. The first transformer T1 and the second transformer, wherein the first transformer T1 is coupled to the PWM controller 10, and the first end of the secondary side of the second T1 is coupled to the first end of the secondary side. The first transformer T1 and the second transformer connected to the secondary side of the lamp and the second transformer T 2 are selectively coupled to a reciprocator 10 to achieve the lamp current. The second transformer T 2 is On the same number of turns, you can select separate transformers on the variable side. In accordance with the principles of the present invention, the low voltage terminals of the secondary side coils of the alternating high voltage drivers of respective phase differences. In accordance with the principles of the present invention, the illuminating force is similar in the case of a lamp, and the lamp is used to obtain a uniform brightness of the lamp. Under ambient conditions, the poles at both ends of the lamp are less likely to appear. If the push and output voltages are set to V s in the push and output, the output lighting voltage needs Vs/2, and the voltage converter T 2 has the first ends of the primary side of the primary side and the secondary two transformers T 2 respectively - The ends are coupled to each other. The first transformer has one end of the lamp 20, and the other end of the second transformer T2 is 20, and the second end of the first transformer T1 is coupled to each other. The second end of the secondary side of the presser T 2 has a resistance R to feedback the stable control of the lamp current to the P W control. The first transformer Τ 1 and the transformer of the ratio and inductance. In the selection of the pressure device, or having more than two secondary to a transformer output with a pre-number to push the electrodes at both ends of the tube, and selectively couple the feedback resistance to the mercury molecules at both ends of the tube For the high voltage tube, the difference in brightness between the two ends is small, which can reduce the uneven brightness. In the case of lamps with the same high voltage end and bright and dark half of the same situation, if the transformer operating voltage is set to V 0 , the two transformers can illuminate the cold cathode tube, and the working voltage

Page 9 I258726 ^----- IX, invention description (5) --------------- * / 2 for the pressure of the wheat, and the passive components around the high voltage output, and withstand voltage The stress is half that of the prior art. έ μ Stomach The operation process of the double high voltage driving circuit disclosed in the present invention is detailed as follows. ^ σ The first transformer Τ 1 and the second transformer Τ 2 output high-voltage AC drive Λ have a predetermined phase difference, and the following description uses one hundred and eighty degrees as a predetermined phase difference. —^ When the high voltage output of the first transformer τ 1 is the positive half cycle of the alternating current signal, the output alternating current signal of the first transformer Τ 2 is an inverted signal that is one hundred and eighty degrees away from the first transformer τ, which is negative. Half cycle, and when the first transformer τ i outputs a high voltage of a negative half cycle, the second transformer T2 outputs a positive half cycle. Assume that the pole of one end of the lamp is V a ′ and the pole of the other end is V b , and the voltage difference between the two ends of the lamp is Vab. Assume that the open lighting voltage v 3 required for this lamp is 3 〇 〇 〇 v r m s, and the operating voltage Vo is 1500 Vrms. For the bilateral high voltage of the lamp, the open voltage Vs(rms) = Vab = Va(rms)-Vb(rms) then Vb(rms) two Va(rnis)-Vs(rins) The known condition Vs is 3 0 0 0 Vrms assumes Va is 1500Vrms

Vb two 1500Vrms-3000Vrmss

Vb = -1500Vrm (negative sign indicates opposite phase) From the above equation, it is known that the open voltage (Vs) of the lamp is required to be 3000Vrms, the first transformer Tl (Va) needs 1 500 Vriiis, and the second transformer T2 (Vb) needs to be reversed.

Page 10 1258726 V. Description of the invention (6) The phase of the 1 phase of the 1 500 Vrms' drive signal is shown in Figure 2. In this way, the withstand voltage required for the peripheral parts of the transformer and the high-voltage output can be reduced, and the specification of the parts with insufficient pressure and parts selection problems can be solved. The operating voltage and so on, the first transformer T 1 and the second transformer τ 2 each output phase of the opposite 75 0 Vrms that can make the poles at both ends of the lamp work at 1500Vrms (ie V 〇 = 1500Vrms) differential pressure, such as As shown in Fig. 3, both Vb and V are voltages, and the molecular activity in the lamp tube is better and consistent, which reduces the problem of bright unevenness and half brightness and darkness at both ends of the lamp. According to the principle of the present invention, under the condition that the lamp current is 丨6 m A, after the actual test, the double-high voltage driving method disclosed in the present invention is applied, and the brightness of the two ends of the driven lamp is 473 cd/m 2 and 494 cd/ M2, the brightness is almost the same. Under the condition that the lamp current is 1.6 mA, the brightness of the two ends of the lamp is 5 8 1 c d /rri and 380 cd/m2 after the cross-section test of the lamp driven by the prior art, and the difference in luminance between the two ends is large. It can be seen that the present invention gives a predetermined phase difference to the lamp, for example, the high voltage output at both ends of the reverse phase, so that the lamp can work normally under the condition of longer length or more severe environmental temperature, thereby increasing product reliability. Sexuality, the open voltage and working voltage of the lamp can be driven only by half of the requirements of the lamp, and the transformer and high-voltage output peripheral parts do not have to withstand such high resistance to electric Φ. If the Va of the conventional lamp is high voltage and the other end Vb is the same phase low voltage, the transformer outputs 300 V rms (V a 2 V s 2 300 V rms ) to illuminate the lamp. And output 1500Vrms operating voltage, transformers and high-voltage output peripheral parts in the voltage resistance specifications can meet the demand, the parts are more difficult to choose

Page 11 1258726 V. The invention is difficult to explain, and the condition of the two ends is reliable. The reliability of the hair module is improved by the ring. The larger the cold indenter and the higher the foot, the smaller and the more limited and the defined 7) When the lamp is only unilaterally high pressure, it will be poorly and adaptable due to environmental and institutional changes. The dual high-voltage driving environment disclosed in the Ming dynasty affects the reliability of the cold cathode tube to meet the shortest withstand voltage required for the output peripheral components of the lower pole length and the normal dynamic voltage. The invention has been described in terms of the preferred embodiments described above. Without departing from the refinement of the present invention, it is a scope of patent protection of the present invention, please refer to the attached application, the mercury molecules in the high and low voltage bright and dark uneven or dark half of the method and its loop unevenness and dark temperature free environment Or the conditions, the financial voltage to bear the distance. The examples reveal the spirit and scope of protection as above. Please patent the scope to improve the backlight half of the problem, is the backlight module and solve the deformation stress is not, but it is not inside, as for the invention Φ

Page 12 1258726 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a dual high voltage driving circuit disclosed in the present invention; Fig. 2 is a driving signal of a dual high voltage driving circuit disclosed in the present invention;

Device 1 controller, variable pressure, said, variable, variable, wide tube, one or two, resistance, pulse, the first electric pattern, the 13th page, the signal area, the horse's road, the return zone, the horse pressure, the high double exposure This is the picture 3

Claims (1)

1258726 VI. Application Patent Range 1. A dual high voltage lamp driving circuit for driving a lamp, comprising: a first AC driving signal for outputting one end of the first transformer lamp; and a second The other end of the transformer lamp has a pre-drive signal for outputting a second AC drive signal to a phase difference between the first AC drive signal and the second AC. In the double high-pressure lamp driving circuit of the above, one of the primary sides is connected to one of the second transformers. The double high voltage lamp driving circuit of claim 1, wherein a low voltage end of one of the secondary sides of the first transformer is coupled to the second transformer end. The double high-voltage lamp driving circuit described in the above description is further coupled with a resistor between the low-voltage terminals. The double high-pressure lamp driving circuit described in 1 item, such as one of the primary side of the application. For example, one of the patents is as follows: 4. If the application is in the application, the first variable range pressure device of the patent is applied. The second side of the mutual range is requested to be patented, etc., and the patent is reserved for the type of double high voltage and one pulse width. The first device is coupled with the drive signal to drive a second connection, and the signal is used to the range of the range. The phase difference lamp drives the variable speed transformer to set the tube transformer to one hundred and eighty degrees. The driving circuit is configured to drive a lamp, comprising: a controller for outputting a driving signal; and one of the primary side and the pulse width modulation control driving signal is boosted to output a first alternating current end And, on the primary side thereof, one end and the pulse width modulation control driving signal are boosted to output the other end of the second alternating current, wherein the first alternating current driving signal 11111 Page 14 1258726 VI. Patent Application Range The second AC drive signal has a predetermined phase difference. 7. The dual high voltage lamp driving circuit of claim 6, wherein one of the primary side of the first transformer and one of the primary side of the second transformer are coupled to each other. 8. The dual high voltage lamp driving circuit of claim 6, wherein a low side end of one of the secondary sides of the first transformer and a low voltage end of one of the secondary sides of the second transformer are coupled to each other. 9. The double high-pressure lamp driving circuit of claim 8, wherein the transformers are coupled to each other with a resistor coupled to the low-voltage end. 10. The double high pressure lamp driving circuit of claim 6, wherein the predetermined phase difference is one hundred and eighty degrees. 1 1. A dual high voltage lamp driving method for driving a lamp, comprising the steps of: inputting a first alternating current driving signal to one end of the lamp; and inputting a second alternating current driving signal to the lamp The other end, wherein the first AC drive signal and the second AC drive signal have a predetermined phase difference. The double high voltage lamp driving method according to claim 11, wherein the step of outputting a first alternating current driving signal is output by a first transformer. The method of driving a dual high voltage lamp according to claim 11, wherein the step of outputting a second alternating current driving signal is output by a second transformer. 1 4 . The method for driving a double high pressure lamp as described in claim 1 of the patent scope, Page 15 1258726 Page 16