TWI285864B - System and method for driving multiple lamps - Google Patents

Abstract

A system for driving multiple lamps includes a transformer circuit, a filter and steady-flow circuit, and a light source. The transformer circuit includes a first output end for outputting a first AC signal, and a second output end for outputting a second AC signal. The filter and steady-flow circuit includes plural filter and steady-flow circuit units that are respectively connected to the first output end for suppressing harmonic signal associated with the first AC signal, smoothing sinusoidal shape of the first AC signal, and transmitting plural third AC signals that have substantial same current values. Each of the filter and steady-flow circuit unit includes an inductance and a capacitor. The light source includes a plurality of lamps, each of which having one end is connected to one of the filter and steady-flow circuit units, and is driven by the third AC signal.

Description

1285864 'Nine, the invention belongs to the technical field of the invention. The invention relates to a lamp driving system, in particular to a multi-tube for a liquid crystal display (LCD) backlight module (BackHght module) Drive System. [Prior Art] _ Liquid Crystal Display (LCD) panels are used as a light source for a Backlight system by placing a 'Discharge Lamp', especially a Cold Cathode Fluorescent Lamp (CCFL). Typically, a cold cathode fluorescent lamp is driven by an inverter circuit that can supply a parent flow signal to a lamp and typically has a feedback and control circuit to monitor the lamp current. Stability. In larger LCD panels, two or more cold cathode fluorescent lamps need to be provided to provide sufficient brightness. The first figure shows a functional module diagram of a conventional multi-lamp drive system. The system includes a commutation circuit 101, a transformer and filter circuit 1〇3, a current balancing circuit 105, a lamp group 1〇7, and a feedback control circuit 1〇9. The converter circuit 101 is configured to convert the input DC signal into an AC signal. The transformer circuit 103 is coupled to the converter circuit 101 for changing the voltage level of the AC signal and suppressing the harmonic signals in the AC signal. Generally, the transformer and filter circuit 1〇3 includes a transformer T1 and a capacitor C1 connected in parallel across the transformer τΐ secondary winding 1285864. An LC filter is formed by the leakage inductance of the transformer T1 and the capacitor C1 to filter the AC signal output from the transformer T1. The current balancing circuit 105 is coupled between the transformer and filter circuit 103 and the lamp group 107. Due to the difference in impedance between the lamps in the lamp group 107, the current flowing through the lamps varies. Therefore, current balancing circuit 105 is required to balance the current flowing through each of the lamps. The feedback control circuit 109 is connected between the lamp group 1〇7 and the commutation circuit for controlling the commutation circuit 1〇1 in accordance with the feedback signal from the lamp group 107.

Please refer to the second figure, which is a specific circuit diagram of the first figure. The connection relationship between the function modules is the same as in the first figure. The transformer and filter circuit 103a is composed of a transformer τι and a capacitor G1 connected in parallel across the secondary winding of the transformer T1. The current balancing circuit 105a is composed of a plurality of transformers Τ11, Τ12, Τ13, ..·τΐη. The primary windings of the transformers Til, Τ12, Τ13, . . . Tin are respectively connected between the end of the transformer π secondary winding and the plurality of lamps LpU, Lpl2呪pi3, ..., and the lamp group 107, and the secondary windings are sequentially connected in series - Loop. The conventional multi-lamp driving system described above provides energy to drive a plurality of lamps by a transformer, and usually requires a current balancing circuit, and the more the number of lamps, the higher the size of the current balancing circuit. Secondly, the Lc filter is formed by the leakage inductance of the transformer and the external capacitor according to the wave circuit system. The demand for leakage inductance has invisiblely increased the size of the transformer and increased the circuit size and cost. Please refer to the third figure, which is also a functional model diagram of a conventional multi-lamp drive system. The difference from the first figure is that the 'variable voltage and wave circuit l〇3b includes 1285864 tr complex transformers T, T2, ... Τη and complex capacitors C1, C2, ... Cn. Each of the transformers ΤΙ, Τ2, "·Τη and the corresponding capacitors Cl, C2," () η form a transformer and filter circuit unit. Each of the transformer and filter circuit units is respectively associated with the lamp group 107 A lamp is connected. A transformer and filter circuit unit drives a lamp. Please refer to the fourth figure, which shows another functional module diagram of a conventional multi-lamp drive system. The difference from the first figure is that The voltage and filter circuit 103c is composed of a transformer and a plurality of capacitors Cl, C2, ·_·(: η. The transformer is wound on the same core with a plurality of sets of windings W, W2, ..., for each winding Wl, W2, ... Wn ^ forms a transformer and filter circuit unit with a capacitor Cl, C2, "πη. Each of the variable voltage and filter circuit units is respectively connected to one of the lamps of the lamp group 107, by a transformer And the filter circuit unit drives a lamp. Since each of the windings W1, W2, ... Wn will occupy a certain space, the number of windings that can be accommodated on the same transformer is limited. The two drawings shown in the third and fourth figures Knowing how many lamp drive systems can be used simultaneously without the need for a current balancing circuit Multiple lamps are required. However, each lamp tube needs a corresponding transformer and filter circuit unit drive. As the number of lamps increases, the size and cost of the transformer and filter circuit increase accordingly. In view of this, it is necessary to provide a multi-lamp driving system to simplify the circuit and reduce the cost without affecting the performance of the circuit. In addition, it is necessary to provide a multi-lamp driving method without affecting the performance of the circuit. The utility model simplifies the circuit and reduces the cost. 9 1285864 A multi-lamp driving system comprises: a transformer circuit, a filtering and steady current circuit and a lamp group. The transformer circuit is used for converting a voltage level of an input AC signal, The method includes: a first output end, outputting a first alternating current signal; and a second output end outputting a second alternating current signal, the second alternating current signal being opposite to a phase of the first alternating current signal. The filtering and current stabilizing circuit includes a plurality of a filtering and current stabilizing circuit unit, respectively connected to the first output end, configured to suppress a harmonic signal in the first alternating current signal, so that the first alternating current The waveform of the signal is smooth, and respectively output a third alternating current signal whose current value is substantially the same. Each of the filtering and current stabilizing circuit units includes an inductor and a capacitor. One end of the inductor is connected to the first input of the transformer circuit. One end of the capacitor is connected to the other end of the inductor, and the other end of the capacitor is grounded. The tube group includes a plurality of tubes, one end of each tube is respectively connected to a filtering and steady current circuit unit, respectively, by the third The multi-lamp driving system comprises a transformer circuit, a filtering and steady current circuit and a lamp group, wherein the transformer circuit is used for converting a voltage level of an input AC signal, comprising: a first output And outputting a first alternating current signal; and outputting a second alternating current signal, the second alternating current signal is opposite to the phase of the first alternating current signal. The filtering and current stabilizing circuit includes a plurality of filtering and steady current circuit units connected to the first output end and the second output end, respectively. Each of the filtering and current stabilizing circuit units includes a first inductor and a second inductor. One end of the first inductor is connected to the first output end of the transformer circuit, and the other end is a third output end, and a third alternating current signal having substantially the same current value is output from the third output end. One end of the second inductor is connected to the second output end of the transformer circuit, and the other 1285864 end is a fourth output end, and a fourth alternating current signal whose current value is substantially the same is output from the fourth output end. The fourth alternating current signal and the third alternating current signal have substantially the same current value and opposite phases. The lamp group includes a plurality of lamps, one end of each of the lamps being connected to a third output of one of the filtering and steady current circuit units, respectively, and driven by the third alternating current signal. A multi-lamp driving method includes the steps of: receiving a DC signal; converting a DC signal into a square wave AC signal; converting a voltage level of a square wave AC signal; and a plurality of filtering and steady current circuit units by a filtering and steady current circuit Converting the square wave AC signal after the conversion voltage level to a plurality of sine wave intersections with the same current value; respectively outputting the sine wave AC signal to each of the lamps of the lamp group; wherein the filtering and The steady current circuit controls the capacitances of the sinusoidal alternating current signals to be substantially the same by controlling the same inductance and capacitance of the complex impedance values. The multi-lamp driving system of the present invention can control the current value of the alternating signal between the lamps of the lamp group through the control of the impedance values of the inductances in the filtering and current-stabilizing circuit units being substantially the same and the impedance values of the capacitors being substantially the same. The same is true, and thus is not affected by the difference in the self-generated impedance of each tube, so there is no need to increase the current balancing circuit in the circuit design. Secondly, a filter and steady current circuit unit is connected in series between each of the transformer circuit and the lamp tube. The filtering and current stabilizing circuit unit forms an LC filter through an external inductor and an external capacitor. Therefore, in the transformer circuit, the transformer design does not need to consider the leakage inductance, and the size thereof can be reduced. Again, each lamp has an inductance connected to it. Therefore, each lamp has a short 11 1285864 m or open state, and the voltage across the lamp varies greatly, which is beneficial to the design of the lamp protection circuit. [Embodiment] Referring to Fig. 5, there is shown a functional block diagram of a first embodiment of a multi-lamp driving system of the present invention. In this embodiment, the multi-lamp driving system includes: an inverter circuit 201, a transformer circuit 203, a filtering and steady current circuit 205, a lamp group 207, and a feedback control circuit (i?eedback) Lu Control Circuit) 209. The commutation circuit 201 is configured to convert an input DC signal into a square wave AC signal. In an actual circuit, the commutation circuit 201 can be a half-bridge converter circuit, a full-bridge converter circuit, or a push-pull commutation. Circuits, etc. The transformer circuit 203 is coupled to the converter circuit 201 for converting the voltage level of the AC signal to provide the power required by the lamp group 207. The filtering and current stabilizing circuit 205 is coupled between the transformer circuit 203 and the lamp group 207 for suppressing the harmonic signal of the AC signal outputted from the transformer_circuit 203, smoothing the waveform, and outputting the AC signal to the lamp group 207. The feedback control circuit 209 is coupled between the lamp group 207 and the converter circuit 201 for controlling the converter circuit 201 in accordance with a feedback signal from the lamp group 207. Please refer to the sixth drawing, which is a specific circuit diagram of a first variation of the first embodiment of the multi-lamp driving system shown in FIG. The commutation circuit 201 is configured to receive an input DC signal Vin and convert it into an AC signal. The transformer circuit 2〇3a can be a transformer T21. The primary winding of the transformer T21. is coupled to the commutation circuit 12 1285864 201 for converting the voltage level of the alternating current signal and outputting from the secondary winding of the transformer T21. One end of the secondary winding of transformer T21 is defined as a first output terminal and the other end is a second output terminal. The first output end and the second output end respectively output a first alternating current signal and a second alternating current signal. The first alternating current signal is only opposite in phase to the second alternating current signal. In the present embodiment, the filtering and current stabilizing circuit 205a includes complex inductances L21, L22, L23, ... L2n and complex capacitors C2, C22, C23, ..., C2n. The inductors L21, L22, L23, . " L2n and a corresponding capacitor 〇2^〇22, 〇23, ···42n • The filtering and steady current circuit unit is defined as the first filter and the current stabilizing circuit unit. The first output end of the secondary winding of the transformer Τ21 is connected in series with one of the lamps Lp21, Lp22, Lp23 of the lamp group -207a. For example, the inductor L21 and the capacitor C21 form a first filtering and current stabilizing circuit unit, which is connected in series between the first output end of the secondary winding of the transformer T21 and the lamp Lp21. The first filtering and current stabilizing circuit unit is configured to suppress the harmonic signals in the first alternating current signal, smooth the waveform of the first alternating current signal, and output third _ alternating current signals having substantially the same current value. The lamps Lp21, Lp22, and Lp23 are respectively driven by a third AC signal. In this embodiment, one of the plurality of inductors L21, L22, L23, . . . , is connected in parallel to the first output of the secondary winding of the transformer T21. The second output of the transformer T21 secondary winding is grounded. Multiple tubes of tube group 207a

Lp21, Lp22, Lp23, ... Lp2n - terminals are respectively connected to the other ends of the complex inductors L2hL22, L23, "·ί2η. One ends of the complex capacitors C21, C22, C23, "·02η are respectively connected to the complex inductors L21, L22, L23 With multiple lamps 13 1285864

Between Lp21, Lp22, Lp23, and. The other end of the complex capacitors C21, C22, C23, .4211 is grounded. The other end of the lamps Lp21, Lp22, Lp23, ."Lp2n is grounded via a resistor R2. In other embodiments than this embodiment, resistor R2 can be replaced by other impedance elements. The feedback control circuit 209 is coupled between the other ends of the plurality of lamps Lp21, Lp22, and Lp23 and the commutation circuit 201. In order to facilitate the circuit principle of the three brothers, in the present embodiment, only the branch formed by the inductor L21, the capacitor C21 and the lamp Lp21 is exemplified. The other branches have the same principle as this branch and are no longer described. In this embodiment, the lamp Lp21 is a Cold Cathode Fluorescent Lamp (CCFL), which usually requires an AC signal of 30 kHz to 10 kHz to drive. Therefore, the frequency of the AC signal output from the converter circuit 201 is required to be high. In the case of high frequency input, the higher the equivalent impedance of the inductor Lp21. At this time, the inductance L21 corresponds to a current source, and the impedance of the lamp Lp21 changes, and the influence of the current flowing through the lamp Lp21 is negligible. Further, the impedance values of the respective branch inductors L21, L22, L23, ..., L2n are substantially the same, and the impedance values of the capacitors C21, C22, C23, ..., C2n are substantially the same, and in this case, flow through the respective lamps Lp21, Lp22 The current values of the third alternating current signal of Lp23 and the third alternating current signal are substantially the same. In each of the paths, the impedance difference of each of the lamps Lp21, Lp22, Lp23, and 1^) 211 itself has little effect on the current values flowing through the lamps Lp21, Lp22, Lp23, ... Lp2n. Therefore, the multi-lamp driving circuit of the present invention does not require an external current balancing circuit. Next, in this embodiment, the inductor L21 and the capacitor C21 form an LC filter 14 1285864 wave filter for suppressing the harmonic signal of the first alternating current signal to smooth the waveform. Therefore, the transformer T21 does not need to consider the leakage inductance requirement, and a smaller size transformer can be selected to reduce the cost. Further, it is possible to simultaneously drive the plurality of lamps Lp21, Lp22, and Lp23 by a transformer T21. In this embodiment, the AC signal outputted by the transformer T21 is a boosted square wave AC signal, which is filtered by the inductor L21 and the capacitor C21 to be converted into a smooth sine wave AC signal for driving the lamp.

Lp2 Bu Again, since the lamp Lp21 is connected to the inductor L21, the voltage difference between the two ends of the lamp Lp21 in the short-circuit or open-circuit state is large, which is beneficial to the protection circuit design of the lamp Lp21. Fig. 7 is a detailed circuit diagram showing a second variation of the first embodiment of the multi-lamp driving system shown in Fig. 5. The difference from the sixth figure is that the filtering and current stabilizing circuit 205b includes a plurality of first filtering and steady current circuit units and a plurality of second filtering and current stabilizing circuit units; the lamp tube group 207b includes a plurality of first lamps Lp31, Lp32, and A plurality of second lamps Lp41, Lp42, and . Each of the inductors L31, L32, ... L3n and a corresponding capacitor C31, C32, . " C3n respectively constitute a first filtering and current stabilizing circuit unit. Each of the inductors L41, L42, and a corresponding capacitor C41, C42, ... [such as a second filter and steady current circuit unit. The components and connection relationships of the first filtering and steady current circuit unit and the second filtering and current stabilizing circuit unit are the same as those of the first filtering and current stabilizing circuit in the fifth figure. The first filtering and current stabilizing circuit is connected to the first output end of the secondary winding of the transformer T31, for suppressing the harmonic 15 1585864 signal in the first alternating current signal outputted by the first output terminal, smoothing the waveform, and rotating the current A third alternating signal with roughly the same value. The second chopping and steady current circuit is coupled to the second output end of the secondary winding of the transformer T31 for suppressing the harmonic signal in the second alternating current signal outputted by the second output terminal, smoothing the waveform, and outputting the current value The same fourth alternating signal. The fourth communication 5 tiger and the second parent flow signal are only in opposite phase. One end of each of the first lamps Lp31, Lp32, ... Lp3n of the lamp group 207b is respectively connected to a first filtering and current stabilizing circuit, and is respectively driven by a third alternating current signal, and each second lamp Lp41, One end of the Lp42 is respectively connected to a second filtering and current stabilizing circuit, and is respectively driven by a fourth alternating current signal. In this embodiment, the impedance values of the complex inductors L31, L32, ." LpSii, Lp41, Lp42, ... Lp4n are substantially the same, and the impedance values of the complex capacitors C31, C32, ... C3n, C41, C42, ^/411 are all Roughly the same. Referring to the eighth drawing, there is shown a functional block diagram of a second embodiment of the multi-lamp driving system of the present invention. In this embodiment, the multi-lamp driving system includes: a commutating electric circuit 3 (H, a transformer circuit 303, a filtering and steady current circuit 305, a lamp tube group 307, and a feedback control circuit 309. The multi-lamp driving system shown in FIG. 5 is different in that the feedback control circuit 309 is coupled between the transformer circuit 303 and the converter circuit 310 for controlling the commutation according to the feedback signal from the transformer circuit 300. Circuit 301. Please refer to the ninth embodiment, which is a specific circuit diagram of a first variation of the second embodiment of the multi-lamp driving system shown in the eighth figure. The difference from the sixth figure is that the transformer circuit 303a includes a transformer T51, Transformer T61, full-bridge circuit 300a and 16 1285864 resistor R5. The primary winding of transformer T51 and the primary winding of transformer T61 are connected in parallel to commutating circuit 301. One end of the secondary winding of transformer T51 is defined as the first output, and the other One end is connected to the first end of the full bridge circuit 300a. One end of the transformer secondary winding is connected to the third end of the full bridge circuit 300a, and the third end is opposite to the first end. The second end of the full bridge circuit 300a is grounded through the resistor R5. Potential. full bridge The fourth end of the circuit 300a is grounded. The other end of the secondary winding of the transformer T61 is defined as an output terminal. The feedback control circuit 309a is connected between the full bridge circuit and the converter circuit 301. The full bridge The circuit 300a is configured to obtain a feedback signal from the transformers T51 and T61, and output the feedback signal to the feedback control circuit 3〇9a. The filtering and current stabilization circuit 305a and the seventh diagram also include a plurality of first filtering and standby circuit early elements. And a plurality of second wave and steady current circuit units, and respectively output a plurality of 苐 父 父 流 5 虎 虎 虎 虎 虎 虎 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 One end is respectively connected to a first filtering and steady current circuit unit, and the other end is respectively connected to a second wave and steady current circuit unit. Each of the lamps Lp51 and Lp52 is simultaneously driven by the third alternating current signal and the fourth alternating current signal. In the present embodiment, the impedance values of the complex inductors L51, L52, and "LpSii, Lp61, Lp62, ..., Lp6n are substantially the same, and the impedance values of the complex capacitors C5pC52, ..., C5n, C61, C62, .. 4611 are substantially the same. Please refer to the tenth figure, which is a specific circuit diagram of a second variation of the second embodiment of the multi-lamp driving system shown in the eighth figure, wherein the commutation circuit 3{n, the transformer circuit 303b and the feedback control circuit 3〇 The composition and connection relationship of 9b are the same as those in the ninth figure 17 285 864. The difference is that the filtering and current stabilizing circuit 305b includes a plurality of filtering and steady current circuit units, and the sixth, seventh, and ninth The structure of the first or second filtering and current stabilizing circuit unit is different. As shown in the tenth figure, the filtering and current stabilizing circuit 305b includes a plurality of inductors 171, 172-丄711, 1^81, [ 82, 〜1811 and a plurality of capacitors 〇71, 〇72, 〇711. Among them, the complex inductors L71, L72, "·: ί7η are connected to the first output end of the transformer circuit 303b, and the complex inductors L81, L82, 〜L8n are connected To the second output of the transformer circuit 303b I. In this implementation In the example, each of the filtering and current stabilizing circuit units includes two inductors and a capacitor. One of the two inductors is respectively connected to the first output end and the second output end of the transformer circuit 303b. The other ends of the two inductors are respectively defined as the third output. And a fourth output end, the capacitor is connected between the third output end and the fourth output end. For example, the inductor L71, the inductor L81 and the capacitor C71 form a filtering and steady current circuit unit. The filtering and steady current circuit unit is used for suppressing The first alternating current signal and the second output end of the transformer circuit 303b output the first alternating current signal and the second alternating current signal, and the harmonic signals in the second alternating current signal are smoothed, and are respectively output from the third output end and the fourth output end. The third alternating current signal and the fourth alternating current signal are output. The third alternating current signal and the fourth alternating current signal are only opposite in phase. One ends of the plurality of lamps Lp71, Lp72, ... Lp7n of the lamp group 307b are respectively connected to each of the filtering and steady current circuits. The third output end of the unit, the other ends of the lamps Lp71 and Lp72 are respectively connected to the fourth output end of each chopper and steady current circuit unit. Each of the lamps Lp71, Lp72 and the third exchange are simultaneously In the present embodiment, the impedance values of the complex inductors L71, L72, ..., L7n, L81, L82, *" L8n 18 1285864 are substantially the same, and the complex capacitors C71, C72, ^/711 The impedance values are substantially the same. Please refer to the eleventh figure, which is a specific circuit diagram of the third variation of the second embodiment of the multi-lamp driving system shown in the eighth figure. The commutation circuit 301, the transformer circuit 303c, the filtering and The constituent elements and the connection relationship of the steady current circuit 305c and the feedback control circuit 309c are the same as those of the corresponding portions of the tenth figure, and the same elements are omitted. The difference is that the lamp group 307c includes a plurality of first lamps Lp91, Lp92, and a plurality of second tubes LplOl, Lpl02, ".LplOn. One end of each of the first lamps Lp91, Lp92, ... Lp9n is respectively connected to the third output end of each of the filtering and steady current circuit units, and the other end is grounded through a resistor R10. The plurality of first lamps Lp91, Lp92, ."Lp9n are respectively driven by the third alternating current signal. One end of each of the second lamps LplO1, Lpl02, ... 14) 1011 is respectively connected to the fourth output end of each of the filtering and steady current circuit units, and the other end is transmitted through a resistor R1 接地 to the ground potential. The plural brothers - LLP01, Lpl02, ."LplOn are driven by the fourth AC signal. In the present embodiment, the impedance values of the complex inductors L91, L92, "·ί9η, L101, L102, "·1010 are substantially the same, and the impedance values of the complex capacitors C71, C72, ..., αη are substantially the same. The circuit principle of the multi-lamp driving system shown in the above seventh to eleventh drawings is the same as that of the multi-lamp driving system of U, and has the same advantages. Referring to Figure 12, a flow chart of a first embodiment of the multi-lamp driving method of the present invention 19 1285864. First, in step S1001, the commutation circuit 201 receives the constant stream signal. In step S1003, the commutation circuit 201 converts the direct current signal into a horizontal wave communication. At step S10 〇 5, the voltage level of the square wave parent stream signal is converted via the transformer circuit 203. In step S1007, the square wave alternating current signal after the converted voltage level is converted into a complex sine wave alternating current signal having substantially the same current value via the complex filtering and current stabilizing circuit unit of the filtering and steady current circuit 205. In step S1009, the sine wave alternating current signals having substantially the same current value are respectively output to the plurality of lamps of the lamp group 207. Finally, in step S1011, the feedback control circuit 209 controls the commutation circuit 2〇1 to convert the DC signal to the square wave AC signal based on the feedback signal obtained from the lamp group 207. Referring to Fig. 13, there is shown a flow chart of a second embodiment of the multi-lamp driving method of the present invention. Step S20 (U, step S2003, step S2005, step S2007, and step S2009 are the same as step s1 〇〇1, step sio 〇 3, step sio 〇 5, step S100 ??? and step S1 shown in the eleventh figure. _ the same. The difference is that in step S2G1, the feedback control circuit _ converts the direct current signal to the square wave alternating signal according to the feedback signal controlled by the transformer circuit to obtain the commutating circuit 3〇1. The invention meets the requirements of the invention patent, and the patent application 22 is according to law: the above description is only the preferred embodiment of the present invention, and all the ___ifications of the case (4) God should be included in The following patent application scope. Tow fly k white [simplified description] 20 1285864 The first picture is the functional module diagram of the first conventional multi-lamp drive system. The first picture is shown in the first figure. The circuit diagram of the lamp driving system. The second figure is the functional module diagram of the second conventional multi-lamp driving system. The fourth figure is the functional module diagram of the third conventional multi-lamp driving system. The work of the first embodiment of the inventive multi-lamp drive system The sixth diagram is a circuit diagram of a first variation of the first embodiment of the multi-lamp driving system of the present invention. The seventh diagram is a first embodiment of the multi-lamp driving system of the present invention. Figure 8 is a circuit diagram of a second embodiment of the multi-lamp driving system of the present invention. The ninth drawing is the first embodiment of the second embodiment of the multi-lamp driving system of the present invention. 10 is a circuit diagram of a second variation of the second embodiment of the multi-lamp driving system of the present invention. FIG. 11 is a second embodiment of the multi-lamp driving system of the present invention. Fig. 12 is a flow chart showing a first embodiment of the multi-lamp driving method of the present invention. Fig. 13 is a flow chart showing a second embodiment of the multi-lamp driving method of the present invention. [Description of main component symbols] Converter circuit 101, 201, 3〇1 21 1285864 Transformer and filter circuit current balancing circuit lamp group feedback control circuit 103, 103a, 103b, 103c 105, 105a 107, 107a, 207, 207a , 207b, 307, 307 a, 307b, 307c 109, 209, 209a, 209b, 309, 309a, 309b, 309c transformer circuit 203, 203a, 203b, 303, 303a, 303b,

303c Transformer Π, Τ2, Τη, ΤΗ, Τ12, Τ13, Τ1η, T21, T3, T51, T6, T7, T8, T9, 9, 101, filter, and current-stabilizing circuits 205, 205a, 205b, 305, 305a, 305b, 305c • Capacitor W Bu W2, Wn C Bu C2, Cn, C2 Bu C22, C23, C2n, C3 Bu C32, C3n, C4J, C42, C4n, C5 Bu C52, C5n, C6 Bu C62, C6n, C7 Bu C72, C7n , C9; l, C92, C9n Inductance L2, L22, L23, L2n, L3, L32, L3n, L4, L42, L4n, L5, L52, L5n, L6, L62, L6n, L7, L72, L7n, L8, L82 , L8n, L9 Bu L92, 22 1285864 L9n, L1 (H, L102, LlOn tube

LpH, Lpl2, Lpl3, Lpln, Lp21,

Lp22, Lp23, Lp2n, Lp31, Lp32,

Lp3n, Lp41, Lp42, Lp4n, Lp51,

Lp52, Lp5n, Lp71, Lp72, L7n '

Lp91, Lp92, Lp9n, LplOl, Lpl02,

LplOn _ resistance Full-bridge circuit R2, R3, R4, R5, R7, R9, RIO 300a, 300b, 300c

twenty three

Claims (1)

1285864 X. Patent application scope: • 1. A multi-lamp driving system 'includes a transformer circuit for converting a voltage level of an input AC signal, the transformer circuit comprising: a first output terminal, outputting a first alternating current The signal 'and a second output terminal output a second alternating current signal, the second alternating current signal is opposite to the phase of the first alternating current signal; _ a filtering and steady current circuit comprising a plurality of filtering and steady current circuit units respectively The first output end is connected to suppress the chopping signal in the first alternating current signal, smooth the waveform of the first alternating current signal, and output a third alternating current signal having substantially the same current value, wherein each filtering and The steady current circuit unit comprises: an inductor, one end is connected to the first output end of the transformer circuit; and _ a capacitor, one end is connected to the other end of the inductor, the other end of the capacitor is grounded; and a lamp group includes a plurality of lamps, one end of each of the lamps being respectively connected to one of the filtering and steady current circuit units, respectively, by the third exchange No. driving. 2. The multi-lamp driving system of claim 1, wherein the impedance values of the respective inductors in the filtering and current-stabilizing circuit units are substantially the same, and the impedance values of the capacitors are substantially the same, such that flowing through the The current value of the second AC signal of the lamp 24 1285864 is approximately the same. 3. The multi-lamp drive system of claim 1, wherein the second output of the transformer circuit is grounded. 4. The multi-lamp driving system of claim 1, wherein the filtering and current stabilizing circuit further comprises a plurality of filtering and steady current circuit units respectively connected to the second output end of the transformer circuit for suppressing The harmonic signal in the second alternating current signal smoothes the waveform of the second alternating current signal, and outputs a fourth alternating current signal whose current value is substantially the same. 5. The multi-lamp driving system of claim 4, wherein the third* alternating current signal and the fourth alternating current signal have substantially the same current value and opposite phases. 6. The multi-lamp driving system of claim 4, wherein the lamp group further comprises a plurality of lamps, one of the ends of each tube and the second output of the transformer circuit are respectively filtered And one of the steady current circuit units is respectively driven by the fourth alternating current signal. 7. The multi-lamp driving system of claim 4, wherein the other end of each of the tube sets is respectively connected to the filtering and steady-current circuit of the second output end of the transformer circuit. One of the units is connected, and is driven by the third alternating current signal and the fourth alternating current signal respectively. 8. The multi-lamp driving system of claim 1, further comprising a converter circuit connected to the transformer circuit for converting an input DC signal into an AC signal and outputting the signal to the AC signal Transformer circuit. 25 1285864 罾9. The multi-lamp driving system of claim 8 further comprising a feedback control circuit coupled between the tube group and the converter circuit for The feedback signal of the lamp group controls the commutation circuit. 10. The multi-lamp driving system as recited in claim 8 further includes a feedback control circuit that is coupled between the read transformer circuit and the commutation circuit for use in accordance with the change_electric_ The feedback signal (4) is the commutation circuit. 11. A multi-lamp driving system comprising: _-transformer circuit for converting a voltage level of a one-person alternating current signal, the transformer circuit comprising: a '-first-output terminal' output 卞 alternating current signal; and a second output end 'Transmission "Ί alternating signal, the second alternating signal is opposite to the phase of the first alternating current signal; a filtering and steady current circuit 'comprising a plurality of filtering and steady current circuit units, respectively, and the first output end and the second round The output terminals are connected, wherein each of the filtering and steady current circuit units comprises: a first inductor, one end connected to the first output end of the transformer circuit, and the other end being a third output end and from the first a third alternating current signal having substantially the same output current value; and a second inductor having one end connected to the second output end of the transformer circuit and the other end being a fourth output end, and outputting from the fourth output end a fourth alternating current signal having substantially the same current value, wherein the fourth alternating current signal and the third alternating current signal have substantially the same current value and opposite phases; and 26 1285864 a light tube group, Comprising a plurality of tubes, one end of each tube are connected with those of the third output terminal wherein one of the filter means and the constant current circuit, are driven by the third alternating current signal. 12. The multi-lamp driving system of claim 11, wherein the filtering and stabilizing circuit unit further comprises a capacitor connected between the third output and the fourth output. 13. The multi-lamp driving system according to claim 12, wherein in the filtering and current stabilizing circuit unit, the impedance values of the first inductor and the second inductor are substantially the same, and the impedance of each capacitor The values are substantially the same, such that the current values of the third alternating current signal and the fourth alternating current signal are substantially the same and the phases are opposite. 14. The multi-lamp driving system of claim 11, wherein the tube group further comprises a plurality of tubes, one of the plurality of tubes and one of the filtering and current-stabilizing circuit units respectively The fourth output ends are connected, and are respectively driven by the fourth alternating current signal. The multi-lamp drive system of claim 11, wherein the other end of each of the tubes of the tube group and the fourth output of one of the filter and current-stabilizing circuit units The terminals are connected to each other, and the third alternating current signal and the fourth alternating current signal are simultaneously driven. 16. The multi-lamp driving system of claim 11, further comprising a converter circuit connected to the transformer circuit for converting an input DC signal into an AC signal and outputting the signal to the AC signal Transformer circuit. 17. The multi-lamp driving system of claim 16, further comprising a 27 1285864 p-feedback control circuit, between the reduced lamp tube group and the commutation circuit, in accordance with the light from the lamp The feedback signal of the pipe group controls the commutation circuit. The multi-lamp driving system of claim 16, further comprising a feedback control circuit coupled between the transformer circuit and the commutation circuit for operating in accordance with the transformer circuit The feedback signal controls the commutation function. 19. A multi-lamp driving method, comprising: ° receiving a DC signal; • converting the DC signal to a square wave AC signal; converting a voltage level of the square wave AC signal; a filtering and steady current circuit converts the square wave alternating current signal after the changing voltage level to a complex sine wave alternating current signal having substantially the same current value; and respectively outputting the sinusoidal alternating current signals to the plurality of light tubes; wherein the filtering and stabilization The flow circuit unit controls the capacitance and capacitance of the same complex impedance value such that the current values of the sine wave AC signals are substantially the same. The multi-lamp driving method of claim 19, further comprising the steps of: generating a feedback control signal via a sine wave alternating signal flowing through the lamps; and controlling the feedback according to the feedback The signal controls the DC signal to convert to the square wave AC signal. 21. The multi-lamp driving method of claim 19, further comprising the steps of: 28 1285864 generating a feedback control signal via a transformer circuit that converts the voltage level of the square wave alternating signal; and according to the The control signal is controlled to convert the DC signal to the square wave AC signal. 29 1285864 XI. Schema: 1285864 VII. Designated representative map: (1) The representative representative of the case is: (6). (2) Brief description of the components of the representative diagram: Converter circuit 201 Transformer circuit 203a Filtering and steady current circuit 205a Lamp group 207a Feedback control circuit 209a Transformer T21 Inductance L2 L22, L23, L2n Capacitor C2 C22, C23 , C2n lamp Lp21, Lp22, Lp23, Lp2n resistor R2 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: None 6