JP2006127789A - Driving circuit for lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving circuit for a lighting fixture, with which occurrence of differences in brightnesses of respective lamps due to variations in characteristics of respective output transformers can be prevented when a plurality of the lamps are driven by using a plurality the output transformers. <P>SOLUTION: Primary input terminals to which AC voltage signals are inputted, of single input/multiple output transformers T1 and T2 having mutually same specifications, are connected in parallel. One of electrodes of a pair of lighting instruments 18 and 24 connected mutually in series and one of electrodes of a pair of lighting instruments 20 and 22 connected mutually in series are connected to secondary high voltage output terminals e and f of the output transformer T1, and another electrode of the pair of lighting instruments 18 and 24 and another electrode of the pair of lighting instrument 20 and 22 are connected to secondary high voltage output terminals h and g of another output transformer T2 corresponding the secondary high voltage output terminals e and f of the output transformer T1. Secondary low voltage terminals a, b, c and d of the output transformers T1 and T2 are connected to the ground. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drive circuit used for an inverter or the like for driving a lighting fixture such as a cold cathode type fluorescent lamp or an EL plate (electric luminescence plate).

Conventionally, a ballastless discharge lamp driving circuit using a multi-lamp type leakage transformer is known as a circuit for driving a plurality of discharge lamps (see, for example, Patent Document 1). Further, a discharge lamp driving circuit has been developed in which primary sides of a plurality of output transformers are connected in parallel and a discharge lamp is connected to the secondary side of each output transformer for driving.
Conventionally, when a plurality of lighting fixtures such as cold cathode fluorescent lamps are driven using the secondary side high-voltage terminal of a 1-input 2-output winding transformer, as shown in FIG. The primary sides of T2 and T3 are connected in parallel, and lighting fixtures L1 to L6 are independently connected to each transformer T1, T2 and T3 as shown in the figure.
JP 2002-075756 (paragraph 0012, FIG. 11)

When the primary sides of a plurality of output transformers are connected in parallel and a lamp such as a cold cathode fluorescent lamp is driven for each output transformer, the characteristics of the output transformer and the load vary even with the same standard. The brightness of the lamp connected to the output transformer will vary. In addition, when many lamps such as cold cathode fluorescent lamps are connected to a large number of secondary windings of a 1-input / multi-output type transformer and the lamps are driven, a load is applied even if each secondary winding is of the same standard. As a result, the brightness of the lamps connected to the secondary windings varies.
The present invention aims to solve the above problems.

When driving a plurality of lamps, a method of driving a lamp by connecting one electrode of the lamp to the secondary high-voltage terminal of the output transformer and dropping the other electrode to the ground (see Patent Document 1) is common. However, in this method, since one end side of the lamp is grounded, the current supplied to the lamp escapes to the ground side due to the presence of stray capacitance in the lamp supply path. For this reason, the voltage at one end of the lamp is lowered, the high voltage terminal connection side of the output transformer is bright, the ground side is dark, and unevenness in brightness occurs between the lamps.
Another object of the present invention is to solve the above problems.

In order to achieve the above-mentioned object, the present invention connects a primary side of a plurality of output transformers of the same standard of one input and a plurality of outputs to each other and inputs an AC signal to the primary side. A luminaire driving circuit for inducing a high-voltage output on a secondary side and driving a plurality of luminaires by the high-voltage output, wherein one of the plurality of luminaires or a plurality of lights connected in series with each other An electrode on one side of the instrument is connected to a secondary high-voltage output terminal of one output transformer of at least a pair of output transformers of the plurality of output transformers, and the one or the other is connected in series with each other. The other electrode of the plurality of lighting fixtures is connected to the other secondary high-voltage output terminal of the pair of output transformers, which is opposite in phase to the secondary high-voltage output terminal of the one output transformer. is there.
According to the present invention, the output transformer is a 1-input 2-output-type winding transformer, and the lighting fixture is a cold cathode fluorescent lamp.
Further, in the present invention, the plurality of output transformers are two one-input two-output type wound transformers, and the secondary side high-voltage terminal of one of the two wound transformers is connected to the secondary transformer. One or a plurality of luminaires connected in series are connected between the high-voltage terminal and the secondary high-voltage terminal of the other winding transformer of opposite phase.
Further, according to the present invention, the plurality of output transformers are two one-input multi-output type output transformers, one secondary high-voltage terminal of one of the two output transformers, A lighting fixture is connected between one of the two output transformers out of phase with the secondary high-voltage terminal and the secondary high-voltage terminal of the other output transformer. Connect lighting fixtures between the two secondary high-voltage terminals of opposite phase, and connect each lighting fixture between the remaining one secondary high-voltage terminal and secondary ground terminal of each output transformer. It is a thing.
According to the present invention, the plurality of output transformers are two one-input multiple-output type output transformers, and each of the secondary high-voltage terminals i, j, k, l and the secondary high-voltage terminals i, j, k, l are opposite in phase to the secondary high-voltage terminals p, o, n, of the other output transformer of the two output transformers. A lighting fixture is connected to m, and the secondary low-voltage terminals a, b, c, d, e, f, g, and h of the two output transformers are grounded.
According to the present invention, the plurality of output transformers are at least three one-input / multiple-output type winding transformers, and a secondary side high-voltage terminal of one winding type transformer among the at least three winding transformers. And the secondary high-voltage terminal and the secondary high-voltage terminal having the opposite phase of one of the other winding-type transformers via one or a plurality of lighting fixtures connected in series The secondary side high voltage terminals of all the winding type transformers are connected in a loop.
In the present invention, the secondary winding is composed of a plurality of wires arranged in parallel.
In the present invention, the output transformer is a winding type transformer in which a primary winding and a secondary winding are mounted on a bobbin in which a core is inserted, and the first secondary winding is wound around the bobbin. A second secondary winding having the same number of turns as the first secondary winding is wound on the secondary winding via an insulating material, and a plurality of secondary windings having the same number of turns are wound on the bobbin. It is constructed by laminating wires.
In the present invention, the primary sides of a plurality of output transformers of one input and multiple outputs type are connected to each other, a lighting fixture is connected to the secondary side of each output transformer, and induced on the secondary side of each output transformer. A lighting fixture driving circuit for lighting a plurality of lighting fixtures with a high-voltage output, wherein all secondary output ends of each of the output transformers are closed loop in series so that secondary output ends of opposite phases are connected to each other. In this configuration, a loop circuit is formed, and a lighting fixture is connected between the secondary output end of the output transformer and the output end of another output transformer having a phase opposite to that of the output end.
In the present invention, a circuit for detecting an abnormal voltage is connected to a connection point between the secondary output terminal and a secondary output terminal having a phase opposite to the secondary output terminal.
In the present invention, a voltage clamp circuit is connected to a connection point between the secondary output terminal and a secondary output terminal having a phase opposite to that of the secondary output terminal.
In the present invention, one side of each of the plurality of coils on the secondary side of the plurality of output transformers is short-circuited to each other.
Further, in the present invention, a wire for short-circuiting one side of each coil on the secondary side is grounded through a high resistance element.
Further, according to the present invention, each of the plurality of output transformers has four secondary coils in the same core, one side of each of the four secondary coils is short-circuited, and the short-circuit wire is connected via a high resistance element. It is characterized by being grounded.
In the present invention, the primary sides of a plurality of output transformers of one input and multiple outputs type are connected to each other, a lighting fixture is connected to the secondary side of each output transformer, and induced on the secondary side of each output transformer. A lighting fixture driving circuit for lighting a plurality of lighting fixtures with a high-voltage output, wherein the secondary output ends of the output transformers are connected in series in a closed loop so that the secondary output ends of opposite phases are connected to each other. It is connected to form a loop circuit, and a plurality of lighting fixtures are connected to the loop circuit so that reverse-phase voltages are applied to the electrodes at both ends.
In the present invention, a number of lighting fixtures are connected to the secondary side of a single output transformer of a single input / multiple output type, and a number of lighting fixtures are turned on by a high-voltage output induced on the secondary side of the output transformer. A lighting circuit driving circuit, wherein all or a plurality of secondary output terminals of the output transformer are connected in series in a closed loop so that secondary output terminals of opposite phases are connected to form a loop circuit. In this loop circuit, a large number of lighting fixtures are connected so that reverse-phase voltages are applied to the electrodes at both ends thereof.
In the present invention, the plurality of lighting fixtures are arranged in parallel on the substrate so as to be parallel to each other, and terminals of one end adjacent to each other of the lighting fixtures are in reverse phase.
According to the present invention, the core of the output transformer includes a pair of parallel core portions and a vertical core portion that couples the parallel core portions, and the primary winding is mounted on the vertical core portion of the core portions, This is a one-input four-output type winding transformer in which a pair of secondary windings are mounted on a pair of parallel core portions at an appropriate interval from each other.
Further, according to the present invention, the core of the output transformer has a linear core portion, a primary winding is mounted in the middle of the linear core portion, and secondary windings are mounted on both sides thereof. This is a winding transformer.
Further, according to the present invention, the core of the output transformer has a pair of parallel core portions extending in a linear direction, and a primary winding is mounted in the middle of each of the parallel core portions, and both sides of each primary winding. This is a one-input four-output type winding transformer in which a secondary winding is mounted.
The present invention further includes a pair of parallel core portions and a coupling core portion having a U-shaped cross section connected to both ends of the parallel core portions, and a primary winding is provided in the middle of each of the pair of parallel core portions. A secondary winding is mounted on both sides of these primary windings to form a 1-input 4-output type winding transformer, an AC signal is input to the primary winding, and the secondary winding Inducing a high-voltage output to drive a plurality of lighting fixtures by the high-voltage output, among the plurality of lighting fixtures, one or a plurality of lighting devices connected in series with each other, The high voltage output terminal of the secondary winding is connected to one high voltage output terminal of the plurality of secondary windings, and the other electrode of the one or the plurality of lighting fixtures connected in series with each other is connected to the high voltage output terminal of the secondary winding. Is connected to the high-voltage output terminal of the other secondary winding of the plurality of secondary windings in reverse phase

  The present invention can reduce variations in brightness of a plurality of lighting fixtures connected to an output transformer.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
In FIG. 1, T1 and T2 are winding type 1 input 2 output type high voltage output transformers having the same structure and the same standard, and the primary side input windings 2 and 4 are connected in parallel by lead wires 6 and 8, respectively. ing. Between the input terminals A and B of the output transformer T1, a resonance capacitor Co and L of the primary winding 2 constitute a series resonance circuit. The input terminals A and B are connected to an inverter circuit, and the input terminals A and B are configured to receive an AC voltage output from the inverter circuit. One ends a, b, c, d of the secondary windings 10, 12, 14, 16 of the output transformers T1, T2 are connected to the ground via terminals.

  Reference numerals 18 and 24 denote cold cathode fluorescent lamps, which are connected in series with each other. The electrode at one end of the lamp 18 is connected to the high voltage terminal e of the secondary winding 10 of the output transformer T1 via the ballast capacitor C1. The electrode at one end of the lamp 24 is connected to the high voltage terminal h of the secondary winding 16 of the output transformer T2 via the ballast capacitor C4. The terminal e and the terminal h are in an opposite phase relationship. Reference numerals 20 and 22 denote a pair of cold cathode fluorescent lamps connected in series with each other, and an electrode at one end of the lamp 20 is connected to a high voltage terminal f of the secondary winding 12 of the output transformer T1 through a ballast capacitor C2. ing. The electrode at one end of the lamp 22 is connected to the high voltage terminal g of the secondary winding of the output transformer T2 via the ballast capacitor C3. The terminal f and the terminal g are in an opposite phase relationship.

  In the configuration described above, when an AC voltage is input to the input terminals A and B and a high AC voltage is induced on the secondary side of the output transformers T1 and T2, a high voltage is applied to both ends of each lamp 18, 20, 22, and 24. An AC voltage is applied, and each lamp 18, 20, 22, 24 is lit. Since high pressure is applied to both ends of each lamp, unevenness in brightness and darkness does not occur. At this time, even if there are variations in characteristics of the output transformers T1, T2, lamps, ballast capacitors, etc., the secondary sides of the output transformers T1, T2 are connected to each other so that a relationship arises. The variation in characteristics is eliminated. As a result, the four lamps 18, 20, 22, and 24 are driven by the averaged characteristic of the secondary side of the output transformers T1 and T2, and the brightness between the lamps 18, 20, 22, and 24 is increased. There will be no difference.

  In the above embodiment, an example in which a 1-input 2-output-type winding transformer is used as an output transformer and a cold cathode fluorescent lamp is used as a load has been described. However, the present invention is not particularly limited to these configurations. A multi-output type piezoelectric transformer may be used, and a lighting device such as an EL plate or a hot cathode fluorescent lamp may be used as a load. Further, the output transformer is not particularly limited to the 1-input 2-output type, and a wound-type 1-input multiple-output transformer can be used as shown in FIG. In FIG. 2, T1 and T2 are winding-type 1-input 4-output high-voltage output transformers of the same structure and the same standard, the primary sides of which are connected in parallel with each other. The lamps 42, 44, 46, 48, 50, 52, 54, 56 are connected as shown.

  The lamps 44 and 46 are connected in series, and one electrode of one lamp 44 is connected to the high voltage terminal j of the secondary winding 28 of the output transformer T1 via the ballast capacitor C6, and one of the other lamps 34 is connected. The electrode is connected to the high voltage terminal k of the secondary winding 30 of the output transformer T1 via the ballast capacitor C7. The high voltage terminal j and the high voltage terminal k are in an opposite phase relationship. Of the lamps 52 and 54 connected in series, one electrode of one lamp 52 is connected to the high voltage terminal n of the secondary winding 36 of the output transformer T2 via the ballast capacitor C10, and One electrode is connected to the high voltage terminal o of the secondary winding 38 of the output transformer T2 via the ballast capacitor C11. The high-voltage terminal m and the high-voltage terminal o are in an opposite phase relationship. The low voltage terminals f and g of the secondary windings 36 and 38 of the output transformer T2 are connected to the ground, and the low voltage terminals b and c of the secondary windings 28 and 30 of the output transformer T1 are connected to the ground.

  One electrode of the lamp 42 is connected to the high voltage terminal i of the secondary winding 26 of the output transformer T1 through the ballast capacitor C5, and the other electrode is connected to the ground terminal a on the low voltage side of the secondary winding 26 of the output transformer T1. Connected to. One electrode of the lamp 56 is connected to the high voltage terminal p of the secondary winding 40 of the output transformer T2 via the ballast capacitor C12, and the other electrode is connected to the grounded low voltage terminal h of the secondary winding 40. is doing. Among the lamps 48 and 50 connected in series, one electrode of the lamp 48 is connected to the high voltage terminal l of the secondary winding 32 of the output transformer T1 via the ballast capacitor C8, and one electrode of the lamp 50 is The ballast capacitor C9 is connected to the high voltage terminal m of the secondary winding 34 of the output transformer T2. The high-voltage terminal l and the high-voltage terminal m are in an opposite phase relationship to each other. The low voltage terminals d and e of the secondary windings 32 and 34 of the output transformers T1 and T2 are grounded.

In the above configuration, by connecting the secondary sides of the output transformers T1 and T2 via the lamps 48 and 50, the characteristics of each other are averaged, and variations in the characteristics are removed. Thereby, the lamps 42, 44, 46, 48, 50, 52, 54, 56 driven by the secondary side of the output transformers T1, T2 are lit with substantially the same brightness.
FIG. 3 shows a modification of the embodiment shown in FIG.
In FIG. 3, T1 and T2 are winding-type 1-input 4-output high-voltage output transformers of the same structure and the same standard, whose primary sides are connected in parallel with each other. Eight cold cathode fluorescent lamps are provided on the secondary side. The lamps 42, 44, 46, 48, 50, 52, 54, 56 are connected as shown.

  The lamps 42 and 56 are connected in series, and one electrode of one lamp 42 is connected to the high voltage terminal i of the secondary winding 26 of the output transformer T1 through the ballast capacitor C5, and one of the other lamps 56 is connected. The electrode is connected to the high voltage terminal p of the secondary winding 40 of the output transformer T1 via the ballast capacitor C12. The high voltage terminal i and the high voltage terminal p are in an opposite phase relationship. Of the lamps 44 and 52 connected in series, one electrode of one lamp 44 is connected to the high voltage terminal j of the secondary winding 28 of the output transformer T1 via the ballast capacitor C6, and One electrode is connected to the high voltage terminal o of the secondary winding 38 of the output transformer T2 via the ballast capacitor C11. The high voltage terminal j and the high voltage terminal o are in an opposite phase relationship.

One electrode of the lamps 46 and 52 connected in series is connected to the high voltage terminal k of the secondary winding 30 of the output transformer T1 via the ballast capacitor C7, and the other electrode is connected to the output transformer T2 via the ballast capacitor C10. The secondary winding 36 is connected to the high voltage terminal n. One electrode of the lamps 48 and 50 connected in series is connected to the high voltage terminal l of the secondary winding 32 of the output transformer T1 via the ballast capacitor C32.
The other electrode is connected to the high voltage terminal m of the secondary winding 34 of the output transformer T2 via the ballast capacitor C9. The high-voltage terminal k and the high-voltage terminal n, and the high-voltage terminals l and m are in an opposite phase relationship. The low voltage terminals a, b, c, d, e, f, g, and h of the secondary windings 32 and 34 of the output transformers T1 and T2 are grounded.

In the configuration described above, the secondary sides of the output transformers T1 and T2 are connected via the lamps 42, 56, 44, 54, 46, 52, 48, and 50, and the respective characteristics are averaged. Variation is removed. Thereby, the lamps 42, 44, 46, 48, 50, 52, 54, 56 driven by the secondary side of the output transformers T1, T2 are lit with substantially the same brightness.
Next, another embodiment of the present invention will be described with reference to FIG.
In FIG. 4, T1, T2, and T3 are high voltage output transformers of the same structure and the same standard of 1 input and 2 output type, and the primary side input winding P1 of each transformer is connected in parallel by a lead wire. . The input terminals A and B of the output transformer T1 are connected to, for example, a Royer parallel resonant inverter circuit, a series resonant inverter circuit, or a separately excited inverter circuit that supplies an AC signal to the primary side of the output transformer T1. The low voltage side terminals a, b, c, d, e, and f connected to the winding end ends of the secondary windings S1, S2, and the output transformers T1, T2, and T3 are connected to the ground.

L1 and L6 are cold cathode fluorescent lamps, which are connected in series with each other. One electrode of the cold cathode fluorescent lamp L1 is connected via a ballast capacitor C1 to a high voltage side terminal g connected to the winding start end of the secondary winding S1 of the output transformer T1, and the cold cathode fluorescent lamp L6 One electrode is connected via a ballast capacitor C6 to a high-voltage side terminal l connected to the winding start end of the secondary winding S2 of the output transformer T3. Among the pair of lamps L2 and L3 connected in series, one electrode of one lamp L2 is connected to the winding start end of the secondary winding S2 of the output transformer T1 via the ballast capacitor C2. One electrode of the other lamp L3 connected to the terminal h is connected to a high voltage side terminal i connected to the winding start end of the secondary winding S1 of the output transformer T2 via the ballast capacitor C3.

Among the lamps L4 and L5 connected in series with each other, one electrode of one lamp L4 is connected to the winding start end of the secondary winding S2 of the output transformer T2 via the ballast capacitor C4. And one electrode of the other lamp L5 is connected to the high voltage side terminal k connected to the winding start end of the secondary winding S1 of the output transformer T3 via the ballast capacitor C5. The high-voltage side terminals g, h, i, j, k, and l of the output transformers T1, T2, and T3 are in opposite phases to each other, and the connection points of the lamps L1 and L6, L2 and L3, L4 and L5, respectively. Apparently, it becomes zero volts.

  In the above configuration, when an AC signal is input from the input terminals A and B to the primary side of the output transformers T1, T2, and T3, and a high-voltage AC voltage is induced on the secondary side of the output transformers T1, T2, and T3. A high-voltage AC voltage is applied across the lamps L1, L6, L2, L3, L4, and L5. At both ends of the secondary windings S1, S2 of the output transformers T1, T2, T3, a voltage corresponding to the total impedance including the load connected to both ends is generated. At this time, for example, related voltages are generated in the secondary winding S2 of the output transformer T1 and the secondary winding S1 of the output transformer T2 via the lamps L2 and L3 connected in series. Similarly, related voltages are generated at both ends of the secondary winding S1 of the output transformer T1 and the secondary winding S2 of the output transformer T3 via lamps L1 and L6 connected in series. In addition, a voltage related to each other through the lamps L4 and L5 is generated at both ends of the secondary winding S2 of the output transformer T2 and the secondary winding S1 of the output transformer T3.

Thereby, all the output transformers T1, T2, and T3 are related, and a uniform current flows through all the lamps L1 to L6, so that the brightness becomes uniform. This means that even if the load impedances of the output transformers T1, T2, and T3 vary, related voltages are generated in the secondary windings S1 and S2 of the output transformers T1, T2, and T3. To do. At this time, when a voltage difference occurs between the secondary windings S1 and S2, the operation of the shunt transformer occurs in the windings of S1 and S2, and the currents flowing through S1 and S2 tend to be the same. And the current correction of S2. With the above operation, all the lamps L1 to L6 are lit with the same brightness. Further, even if the constant of the impedance component of the lamp changes due to the temperature change, stable brightness can be obtained for each of the lamps L1 to L6 by the above operation.

As described above, the voltage across the secondary windings S1, S2 of the output transformers T1, T2, T3 becomes uniform, so that the voltage of the winding P1 on the primary side of each of the output transformers T1, T2, T3 is also almost equal. It becomes the same value, and stable lamp driving becomes possible. A voltage corresponding to the primary and secondary winding ratio is generated on the primary side of each output transformer. That is, a voltage corresponding to the turn ratio of the voltage generated in the secondary winding is generated. If the secondary side voltages of the output transformers T1, T2, and T3 are substantially equal to each other, the primary side of each output transformer And the supplied power are the same. Also in this embodiment, the lamp is not particularly limited to a cold cathode fluorescent lamp, and the output transformer is not particularly limited to a winding type, and a piezoelectric transformer or the like can be used.

FIG. 5 shows an embodiment in which twelve lamps L1 to L12 are driven using three transformers TF1, TF2, and TF each having a bifilar winding (parallel winding) on the secondary side and one input and four outputs. Yes. 6 and 7 show a bifilar-winding 1-input 4-output transformer TF1.
In FIG. 6, reference numeral 182 denotes a core, and two U-shaped cores are joined to form a square-shaped core. A primary bobbin 184 is fitted and disposed in one of the parallel portions of the core 182. A terminal block 186 is fixed at the center of the primary bobbin 184, and primary input terminals 188 and 190 are provided on the terminal block 186. A primary winding 192 is mounted on the bobbin 184, and both ends of the primary winding 192 are connected to primary input terminals 188 and 190 via lead wires.

  On the outside of the primary bobbin 184, a pair of secondary bobbins 191 and 194 are fitted and arranged on both sides of the terminal block 186. The partitions 196 at each end of the secondary bobbins 191 and 194 are in contact with both side surfaces of the terminal block 186. In FIG. 6, the partitions 196 of the secondary bobbins 191 and 194 are not shown in order to avoid complication of the drawing. Secondary windings 198 and 200 are wound around the secondary bobbins 191 and 194 by two double wires a and b. The winding start ends of the secondary windings 198 and 200 made of double wires are secondary high-voltage terminals 206 and 208 provided on the terminal blocks 202 and 204 of the secondary bobbins 191 and 194 via lead wires. 210, 212, and the winding end ends are connected to ground terminals 214, 216, 218, 220 via lead wires.

In the above-described configuration, the relationship between the primary winding 192 and the secondary windings 198 and 200 is simple because the secondary windings 198 and 200 are disposed on both sides of the primary winding in the two-layer structure of the bobbin. Multiple outputs can be configured with a simple structure. In the present embodiment, a high voltage is applied to the double parallel lines constituting the secondary winding. However, since these high voltages are at the same potential, there is no short circuit or leakage of current between the parallel secondary windings. Absent. In addition, the other parallel portion 182a of the core 182 can have the same configuration, and in the case of this vertically symmetric structure, the primary side is connected in series or in parallel to provide one input, thereby realizing eight outputs. . Further, when the number of windings of the secondary winding is 3 or 4, etc., more outputs can be achieved.
In FIG. 5, TF1, TF2, and TF3 have primary-side input terminals 188 and 189 connected in parallel by lead wires. The input terminals 188 and 189 of the output transformer TF1 are connected to, for example, a Royer parallel resonant inverter circuit, a series resonant inverter circuit, or a separately excited inverter circuit that supplies an AC signal to the primary side of the output transformer TF1.

The low-voltage side terminals 214, 216, 218, and 220 connected to the winding end ends of the secondary windings 198 and 200 of the output transformers TF1, TF2, and TF3 are connected to the ground. L1 and L12, L2 and L11 are cold cathode fluorescent lamps, and are connected in series with each other. One electrode of the cold cathode fluorescent lamps L1 and L2 is connected to high-voltage side terminals 206 and 208 connected to the winding start end of the secondary winding of the output transformer TF1 via the ballast capacitors C1 and C2. One electrode of the fluorescent lamps L12 and L11 is connected to high-voltage side terminals 210 and 212 connected to the winding start end of the secondary winding of the output transformer TF3 via ballast capacitors C12 and C11. Of the pair of lamps L3 and L6 and the pair of lamps L4 and L5 connected in series, one electrode of one of the lamps L3 and L4 is connected to the secondary winding of the output transformer FT1 via the ballast capacitors C3 and C4. Connected to the high voltage side terminals 212 and 210 connected to the winding start end of 200, one electrode of the other lamps L5 and L6 is wound by the secondary winding of the output transformer TF2 via the ballast capacitors C5 and C6. It is connected to the high voltage side terminals 206 and 208 connected to the start end.

Among the lamps L7 and L10 and the pair of lamps L8 and L9 connected in series, one electrode of one of the lamps L7 and L8 is wound by the secondary winding of the output transformer TF2 via the ballast capacitors C7 and C8. Connected to the high voltage side terminals 212 and 210 connected to the starting end, one electrode of the other lamps L9 and L10 is connected to the winding starting end of the secondary winding of the output transformer TF3 via the ballast capacitors C9 and C10. It connects to the high voltage side terminals 206 and 208 to be connected. The high-voltage side terminals 206 and 208 and the high-voltage side terminals 210 and 212 of the output transformers TF1, TF2, and TF3 are in opposite phases to each other, and the lamps L1 and L12, L2 and L11, L3 and L6, L4 and L5. , L7 and L10, L8 and L10, and L8 and L9 are apparently connected to zero volts. Also in this embodiment, the lamp is not particularly limited to a cold cathode fluorescent lamp, and the output transformer is not particularly limited to a winding type, and a piezoelectric transformer or the like can be used.

  In the above configuration, an AC signal is input from the input terminals A and B of the circuit to the primary side of the output transformers TF1, TF2, and TF3, and a high-voltage AC voltage is induced on the secondary side of the output transformers TF1, TF2, and TF3. Then, a high-voltage AC voltage is applied across the lamps L1, L12, L2, L11, L3, L6, L4, L5, L7, L10, L8, and L9. At both ends of the secondary windings 198, 200 of each output transformer TF1, TF2, TF3, a voltage corresponding to the total impedance including the load connected to both ends is generated. At this time, for example, related voltages are generated in the secondary winding 200 of the output transformer TF1 and the secondary winding 198 of the output transformer TF2 via the lamps L2 and L6 connected in series and the lamps L4 and L5. . Similarly, voltages related to each other through the lamps L1, L2 and L11, L12 connected in series are generated at both ends of the secondary winding 198 of the output transformer TF1 and the secondary winding 200 of the output transformer TF3. . Further, voltages related to each other through the lamps L7, L10, L8, and L9 are generated at both ends of the secondary winding 200 of the output transformer TF2 and the secondary winding 198 of the output transformer TF3.

Thereby, all the output transformers TF1, TF2, and TF3 are related to each other, and a uniform current flows through all the lamps L1 to L12, so that the brightness becomes uniform. This means that even if the load impedances of the output transformers TF1, TF2, and TF3 vary, related voltages are generated in the secondary windings 198 and 200 of the output transformers TF1, TF2, and TF3. To do. At this time, when a voltage difference occurs between the secondary windings 198 and 200, the operation of the shunt transformer occurs in the windings of the secondary windings 198 and 200, and the current flowing through the secondary windings 198 and 200 The currents of the secondary windings 198 and 200 are corrected. Similarly, the current correction is performed between the windings a and b of the secondary winding 198 by the operation of the shunt transformer, and the current correction is similarly performed between the windings a and b of the secondary winding 200 by the operation of the shunt transformer. Done. With the above operation, all the lamps L1 to L12 are lit with the same brightness.

Further, even if the constant of the impedance component of the lamp changes due to the temperature change, stable brightness can be obtained for each of the lamps L1 to L12 by the above operation. As described above, the voltage across the secondary windings 198, 200 of the output transformers TF1, TF2, TF3 becomes uniform, so that the voltage of the winding 192 on the primary side of each output transformer TF1, TF2, TF3 is also almost equal. It becomes the same value, and stable lamp driving becomes possible. A voltage corresponding to the primary and secondary winding ratio is generated on the primary side of each output transformer. That is, a voltage corresponding to the turn ratio of the voltage generated in the secondary winding is generated. This is because the primary side of each output transformer is equal if the secondary side voltages of the output transformers TF1, TF2, and TF3 are substantially equal to each other. And the supplied power are the same.

FIG. 8 shows another embodiment of parallel winding of wires in a transformer.
A first secondary winding 136 is laminated and wound on a bobbin 132 having a built-in core 130 via an insulating material 134, and is wound on the first secondary winding 136 via an insulating material 138. The second secondary winding 140 is laminated and wound with the same number of turns as the first secondary winding 136, and corresponds to the two windings a and b in FIG. The secondary windings 136 and 140 may be configured as a laminated structure. The first secondary winding 136 may be a bifilar winding composed of two or more lines, and similarly, the second secondary winding 140 may be a bifilar winding composed of two or more lines. In FIG. 8, if each of the first and second secondary windings 136 and 140 is constituted by two wires, a 1-input 4-output winding transformer can be constituted. This laminated transformer can be used in all of the embodiments of the present invention.

Next, another embodiment of the present invention will be described with reference to FIG.
In FIG. 9, output transformers T1, T2 and T3 are one-input four-output type winding transformers having the same standard and having a secondary winding wound around the same core by bifilar winding, and each primary side Are connected in parallel by lead wires. The output transformers T1, T2, and T3 are not particularly limited to the winding type transformer in which the secondary winding is wound around the same core by bifilar winding, and may be wound around different cores. In short, a transformer having any structure may be used as long as it is a one-input / multiple-output transformer, such as a piezoelectric transformer.
Input terminals a and b of the output transformer T1 are connected to an output portion of a full-bridge self-excited oscillation circuit 56 including four FETs Q1, Q2, Q3, and Q4 via a resonance capacitor Co. The resonant capacitor Co and the primary winding of the output transformer T1 are connected in series, and an LC series resonant circuit is configured on the primary side of the output transformer T1.

A phase detection circuit 58 is connected to an input terminal a positioned at the midpoint of the LC series resonance circuit on the primary side of the output transformer T1, and the phase signal on the primary side of the output transformer T1 is transmitted through the lead wire to the self-excitation. It is configured to be supplied to 56 control units (not shown) of the oscillation circuit. The power supply circuit for supplying an AC signal to the primary side of the output transformer T1 is not particularly limited to the full-bridge self-excited oscillation circuit 56. A Royer-type parallel resonant inverter circuit, a separately-excited inverter circuit, etc. Can be used. The output ends of all twelve coils S1 to S12 on the secondary side of the output transformers T1, T2, and T3 are connected in series to each other on a loop circuit that forms a closed loop. This loop circuit is configured by a single closed-loop current carrying path that starts from the output end p1 and returns to the other output end p3 of the coil S1, with one output end p1 of the coil S1 as a reference.

The path of the loop circuit is as follows: output terminal p1, terminal e of terminal block CN2, lamp L1 (CCFL), lamp L2, coil S11, resistor Rs, resistor Rs, coil S10, terminal f of terminal block CN5, lamps L3, L4 , Terminal g of terminal block CN3, coil S8, resistor Rs, resistor Rs, coil S5, terminal i of terminal block CN2, coil S3, resistor Rs, resistor Rs, coil S2, terminal j of terminal block CN1, lamps L7, L8 , Terminal k of terminal block CN5, coil S12, resistor Rs, resistor Rs, coil S9, terminal l of terminal block CN6, lamps L9, L10, coil S7, resistor Rs, resistor Rs, coil S6, terminal m of terminal block CN3 , Lamps L11 and L12, terminal n of the terminal block CN1, coil S4, resistor Rs, resistor Rs, and a closed loop that reaches the other output end p3 of the coil S1. It has been. A voltage clamp circuit 60 composed of Zener diodes ZD, ZD or a surge absorber is connected to the connection points r1, r2, r3, r5, r6 of the coils of the output transformers T1, T2, T3.

A connection point r4 of the output transformer T2 is connected to the ground in order to obtain a lamp current detection signal from the shunt resistor Rs through the lead wire 68. The connection points r1, r2, r3, r5, r6 of the coils of the output transformers T1, T2, T3 are respectively connected to a lamp open detection comparator 62 and a lamp deterioration detection comparator via a diode D and a voltage detection circuit 66. 64 input terminals are connected. The output terminals p1, p2, p9, p10, p17, and p18 of the output transformers T1, T2, and T3 are in phase with each other, and the output terminals p7, p8, p15, p16, p23, p24 is in reverse phase. The output terminals p3, p4, p11, p12, p19, and p20 are in phase with each other, and the output terminals p5, p6, p13, p14, p21, and p22 are out of phase with respect to these output terminals. Due to this relationship, the connection points of the pair of lamps connected in series and the connection points r1 to r6 of the coil are apparently zero volts. The output terminals of the comparators 62 and 64 are connected to the control unit of the self-excited oscillation circuit 56, respectively.

  In the configuration described above, an AC signal is input from the output section of the self-excited oscillation circuit 56 to the primary side P of the output transformers T1, T2, T3, and a high voltage is induced on the secondary side of the output transformers T1, T2, T3. Then, the same current flows through each of the lamps L1 to L12 through a loop circuit that connects the coils of the output transformers T1, T2, and T3 in a loop shape, and the lamps L1 to L12 are lit with the same luminance. When a disconnection occurs in any lamp, wiring, or output transformer winding on the loop circuit, a high voltage corresponding to the number of outputs of the output transformers T1, T2, and T3 is generated in the loop circuit. When this high voltage is generated, the voltage balance of the loop circuit is lost, and a voltage exceeding the set Zener voltage is generated at the coil connection points r1 to r6. At this time, the loop circuit is connected to the ground through the voltage clamp circuit 60, and the loop circuit is clamped to a predetermined voltage.

This prevents an abnormally high voltage from occurring in the loop circuit. On the other hand, when an abnormal voltage is generated at the connection points r1 to r6, this voltage signal is detected by the voltage detection circuit 66 through the diode D, and this detection signal is input to the comparators 62 and 64. The comparator 62 outputs a lamp open detection signal, and the driving of the self-excited oscillation circuit 56 is stopped. Further, when the lamps L1 to L12 deteriorate and the balance of the loop circuit is lost, an unbalanced current flows as reactive power to the voltage clamp circuit 60, and a lamp deterioration signal is obtained. This lamp deterioration signal is supplied to the comparator 64, and the comparator 64 outputs a lamp deterioration detection signal, and the self-excited oscillation circuit 56 stops. In this embodiment, the primary sides P of the output transformers T1, T2, and T3 are connected in parallel to the output unit of the self-excited oscillation circuit 56. However, the present invention is not particularly limited to this connection method, and is connected in series. But it ’s okay.

FIG. 11 shows a modification of the configuration in which a plurality of lamps are connected in a loop.
As shown in FIG. 10, the output transformers T1, T2, and T3 include a U-shaped upper core 222 and a lower core 224, and a primary coil is formed on the vertical core portion of the upper core 222 and the pair of parallel core portions 222a and 222b. P and four secondary coils S1, S2, S3, S4 are attached via bobbins (not shown). The secondary coils S1, S2 and S3, S4 may be parallel windings as shown in FIG. In FIG. 11, the primary side of the output transformers T1, T2, T3 is the same as that shown in FIG. 9, and this portion is omitted. A pair of lamps L1, L2, L3, L4, lamps L5, L6, lamps L7, L8, lamps L9, L10, and lamps L11, 12 connected in series are output transformers T1, T2, T3 as shown in the figure. Is connected to the high-voltage output terminal on the secondary side. The high-voltage terminals on the secondary side of the output transformer connected to one side a and the other side b of each pair of lamps are in opposite phases. That is, the output terminals A and L are out of phase with each other. Similarly, D and E, H and I, M and X, P and Q, and T and U are out of phase with each other.

As shown in FIG. 11, terminals N and C, R and G, V and K on one side of the secondary coils S1 and S4 of the output transformers T1, T2 and T3, which are in opposite phases to each other, are connected to a resistor RS1. , RS4 is connected. Terminals B and O, F and S, J and W, which are in opposite phases to each other on one side of the secondary coils S2 and S3, are connected via resistors RS2 and RS3, and a high resistance R1, 1M ohm Grounded via R2. The output ends of all twelve secondary coils S1, S2, S3, S4 on the secondary side of the output transformers T1, T2, T3 are connected in series with each other on one loop circuit forming a closed loop. Connected. This loop circuit starts from this terminal H with reference to the terminal H on one side of the secondary coil S4 of the output transformer T2, and the coils S1, S4 of the output transformer T3, the lamps L6, L5, and the coil S2, of the output transformer T2. S3, lamps L7 and L8, coils S1 and S4 of the output transformer T1, lamps L3 and L4, coils S2 and S3 of the output transformer T3, lamps 12 and 11, and coils S1 and S4 of the output transformer T2 to this terminal H Consists of a single closed loop current carrying path. In the figure, N is a connector.

In the output transformer shown in FIG. 10, when the windings are not parallel, the secondary windings S1 and S2 are separated from each other, and the secondary windings S3 and S4 are separated from each other. Binding is avoided. Thereby, in the closed loop coupling circuit shown in FIG. 11 in which all the lamps are connected in series on one loop, it is possible to prevent a short circuit phenomenon of the closed loop circuit due to capacitive coupling between the secondary windings. In addition, as shown in FIG. 17, the primary winding P is arranged in the middle of the straight portion of the core 240, and the secondary windings S1 and S2 are arranged on both sides thereof via bobbins (not shown). Two output transformers T1 and T2 (may be two or more) are provided, and the primary winding P of each of the output transformers T1 and T2 is connected in parallel, and the circuit shown in FIG. 1 or the closed loop circuit shown in FIG. If it is comprised, the short circuit phenomenon by the capacitive coupling between secondary windings can be prevented more effectively. In FIG. 17, the secondary terminals a and b, and c and d are in an opposite phase relationship to each other. That is, when a positive high voltage appears at terminals a and c, a negative high voltage of negative phase appears simultaneously at terminals b and d. Both ends of the linear portion 240a of the core of each output transformer are magnetically coupled by the lower core 240b. Note that the output transformers T1 and T2 shown in FIG. 17 may be combined into one as shown in FIG.

FIG. 19 shows a 1-input 4-output type output transformer. In FIG. 19, both ends of the parallel core portions 242 and 244 of the upper core are coupled by the lower core 246, and the primary winding P is connected to the center of the parallel core portions 242 and 244 via bobbins (not shown), respectively. The primary winding is formed by winding. The primary winding is wound around each parallel core portion 242 and 244 via a bobbin (not shown), and these are connected in parallel or in series. The primary winding P may be formed by winding the parallel core portions 242 and 244 across the bobbin (not shown). On both sides of the primary winding P, secondary windings S1, S2, S3, and S4 are mounted on parallel core portions 242 and 244 via bobbins (not shown) as shown in the figure. In FIG. 17 and FIG. 19, L1, L2, L3, and L4 are lighting fixtures composed of cold cathode fluorescent lamps. FIG. 21 shows a four-output type output transformer in which parallel core portions 242 and 244 and a vertical core portion 248 are formed by an H-shaped core. The configuration other than the vertical core portion 248 of the output transformer is the same as the configuration of the output transformer using the I-type core shown in FIG. By using the output transformer having such a configuration, it is possible to prevent the adverse effect of capacitive coupling between the secondary windings in the luminaire driving circuit using the multi-output transformer.

Next, an embodiment obtained by improving the embodiment shown in FIG. 11 will be described with reference to FIG.
In the output transformer used in the lamp driving circuit, normally, as shown in FIG. 10A, magnetic lines 226 and 228 are generated in one core portion 222a of the upper core 222 and the other core portion 222b. When an imbalance occurs in the currents of the secondary coils S1 and S2 of the core part 222a and the secondary coils S3 and S4 of the core part 222b, a coupling capacitor X is generated between the core part 222a and the core part 222b, and the magnetic field lines 230 are generated. Is generated in the lower core 224. This magnetic field line 230 causes a current to flow between the core portions 222a and 222b, all of which become invalid currents, and currents flowing through the secondary coils S1 and S2 of the core portion 222a and the secondary coils S3 and S4 of the core portion 222b. Is unbalanced. In order to eliminate this phenomenon, the present invention eliminates this phenomenon, as shown in FIG. 12, the terminals NB, OC, RF, SG, VJ, WK on one side of the secondary coils S1, S2 of the output transformers T1, T2, T3 that are in phase with each other. Are connected (short-circuited), and each midpoint AB of this short-circuited line is connected (short-circuited) in series by a line 232, and the midpoint of this line 232 is connected to the ground through a high resistance 234 of 1 M ohm. .

As described above, when point A and point B are connected in series by line 232, current flows between AB, and secondary coils S1, S2 and secondary coils S3, S4 of each output transformer T1, T2, T3 are , Equal voltages (potentials). The output ends of all twelve secondary coils S1 to S4 on the secondary side of the output transformers T1, T2, and T3 are connected in series to each other on a single loop circuit forming a closed loop. The twelve lamps L1 to L12 are connected in series to the loop circuit, and a current flows through the twelve lamps through a line 232 connecting AB. When current flows through all the lamps, the secondary coils S1 and S2 or S3 and S4 of each output transformer have the same potential due to the operation of the shunt choke (shunt transformer), and the points A and B are connected. As a result, the secondary coils S1 and S2 and the secondary coils S3 and S4 have closer voltages. By connecting the points A and B and connecting to the ground through the high resistance 234, a voltage corresponding to the current flowing to the ground through the high resistance 234 is generated at the point C. Theoretically, the point C is zero volts, but it has a potential deviated from zero volts due to the imbalance between the secondary coils S1, S2 and the secondary coils S3, S4 due to the stray capacitance of the output transformer, the leakage inductor, or the like. . It is preferable to determine the value of the resistor 234 so that this potential is a safe voltage. However, since the potential at the point C varies depending on the external temperature or the like, in this embodiment, the resistance is set to 1 M ohm for the time being. is there. However, this resistance value is not limited, and an appropriate value can be selected from values higher than the total impedance of the closed loop.

In implementing the present invention, grounding the wire 234 via the high resistance 234 is not an essential requirement. When the unbalance between the secondary coils S1, S2 and the secondary coils S3, S4 increases, the unbalance current flowing through the high resistance 234 increases. All of these currents become reactive currents and cause efficiency deterioration, but in this embodiment, the unbalanced state generated between the secondary coils S1 to S4 by connecting points A and B in series is An unbalanced current flows between each other, the unbalance is corrected, the potential at the point C becomes zero, and the luminance of each of the lamps L1 to L12 becomes constant. In addition, capacitive charge leakage in the core portions 222a and 222b and magnetic flux 230 across the core portions 222a and 222b are also reduced. Other configurations of the present embodiment shown in FIG. 12 are the same as those of the embodiment shown in FIG.

FIG. 13 shows an implementation in which the output terminals of all 12 secondary coils S1 to S4 on the secondary side of the output transformers T1, T2, T3 are connected in series on a loop circuit forming a closed loop. The form is shown. One and the other of each pair of lamps are connected to the output ends of the secondary coils, which are in an opposite phase relationship. The connection circuit configuration in which the secondary side points A and B of each output transformer are short-circuited is the same as the configuration shown in FIG. 12, but the configuration shown in FIG.
FIG. 14 shows a configuration in which a closed loop current carrying path is formed for each transformer T1 to T3, and four lamps L1 to L4 are connected in series to each current carrying path. FIG. 15 shows a preferred arrangement example of the lamps L <b> 1 to L <b> 12 with respect to the backlight unit substrate 236. The connection terminals at the left end of the lamp on the substrate 236 are arranged so as to be alternately in reverse phase. In the circuit of FIG. 15, all the lamps are connected in series to a closed loop circuit, and this configuration is the same as the configuration of FIG.

In the figure, -HV and + HV indicate secondary high-voltage outputs in opposite phases. For example, when the output -HV is applied to the connection terminals a, c, e, g, i, and k of the lamps arranged in order, the output + HV is output to the connection terminals b, d, e, h, j, and l. Applied. In this way, it has been experimentally confirmed that a favorable lamp driving characteristic can be obtained by the configuration. As long as the left connection terminals of the lamps L1 to L12 are alternately in opposite phases, the present invention is not particularly limited to the lamp arrangement shown in FIG. The position of may be changed, and other arrangements can be selected. In the present invention, each pair of lamps employs a straight tube type lamp and is connected by a lead wire. However, the present invention is not particularly limited to this configuration, and instead of the pair of lamps, 1 A U-tube lamp can be used. Moreover, each output transformer used by this invention is the same standard, and the winding number of each secondary coil is also the same.

In addition, as shown in FIG. 16, the present invention uses a single output transformer such as a 1-input 12-output type in which the secondary windings S1 to S12 are wound around the same core. It is possible to light the lamps L1 to L12 uniformly. The embodiment shown in FIG. 16 is the same as the embodiment shown in FIGS. 13 and 15 except for the configuration using one output transformer T1 instead of the three output transformers T1 to T3 shown in FIGS. It is. That is, the embodiment of FIG. 16 shows a modified example of the closed loop connection of a large number of lamps. Also, the number of turns of each secondary coil is the same, and the primary coil is not shown.

It is a circuit diagram of the lighting fixture drive circuit which concerns on this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a plane explanatory view of a winding type transformer. It is an external view explanatory drawing of a winding type transformer. It is sectional drawing which shows other embodiment of a parallel winding transformer. It is a circuit diagram which shows other embodiment of this invention. It is explanatory drawing of an output transformer. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention. It is explanatory drawing which shows other embodiment of this invention. It is explanatory drawing of an output transformer. It is explanatory drawing which shows other embodiment of this invention. It is explanatory drawing of an output transformer. It is explanatory drawing which shows other embodiment of this invention. It is explanatory drawing of an output transformer. It is a circuit diagram of a prior art.

Explanation of symbols

2 Input winding
4 Input winding
6 Lead wire 8 Lead wire 10 Secondary winding 12 Secondary winding 14 Secondary winding 16 Secondary winding 18 Lamp 20 Lamp 22 Lamp 24 Lamp 26 Secondary winding 28 Secondary winding 30 Secondary winding 32 Secondary winding 34 Secondary winding 36 Secondary winding 38 Secondary winding 40 Secondary winding 42 Lamp 44 Lamp 46 Lamp 48 Lamp 50 Lamp 52 Lamp 54 Lamp 56 Self-excited oscillation circuit 58 Phase detection circuit 60 Voltage clamp Circuit 62 Comparator 64 Comparator 66 Voltage detection circuit 68 Lead wire 130 Core 132 Bobbin 134 Insulating material 136 Secondary winding 138 Insulating material 140 Secondary winding 182 Core 184 Bobbin 186 Terminal block 188 Input terminal 190 Input terminal 192 Bobbin 194 Bobbin 196 Partition 198 Secondary winding 200 Secondary winding 202 Terminal block 204 Terminal block 206 High voltage terminal 08 High voltage terminal 210 High voltage terminal 212 High voltage terminal 214 Ground terminal 216 Ground terminal 218 Ground terminal 220 Ground terminal 222 Upper core 224 Lower core 226 Magnetic field line 228 Magnetic field line 230 Magnetic field line 232 Line 234 High resistance 236 Substrate 240 Core 242 Parallel core part 244 Parallel core part 246 Lower core 248 Vertical core part

Claims (22)

  Connecting the primary sides of a plurality of output transformers of the same standard of one input and multiple outputs to each other, inputting an AC signal to the primary side, inducing a high-voltage output on the secondary side of each output transformer, A lighting fixture driving circuit for driving a plurality of lighting fixtures with a high-voltage output, wherein one of the plurality of lighting fixtures or one electrode of a plurality of lighting fixtures connected in series is connected to the plurality of lighting fixtures. Of the at least one pair of output transformers, and connected to the secondary high-voltage output terminal of one of the output transformers, and the other electrode of the one or more lighting fixtures connected in series to each other A lighting fixture driving circuit, wherein the lighting device drive circuit is connected to the other secondary high-voltage output terminal of the pair of output transformers, which is opposite in phase to the secondary high-voltage output terminal of the one output transformer.   2. The lighting fixture driving circuit according to claim 1, wherein the output transformer is a one-input two-output winding transformer, and the lighting fixture is a cold cathode fluorescent lamp.   The plurality of output transformers are two one-input two-output type wound transformers, and a secondary high-voltage terminal of one of the two wound-type transformers and a phase opposite to the high-voltage terminal The lighting fixture drive circuit according to claim 1, wherein one or a plurality of lighting fixtures connected in series are connected between the secondary winding high-voltage terminal of the other winding type transformer.   The plurality of output transformers are two one-input multi-output type output transformers, one secondary high-voltage terminal of one output transformer of the two output transformers, and the secondary high-voltage terminal Is connected to a secondary high-voltage terminal of one of the two output transformers out of the two output transformers, and each of the two output transformers has a phase opposite to each other. A lighting fixture is connected between the secondary side high voltage terminals, and each lighting fixture is connected between the remaining one secondary side high voltage terminal of each output transformer and the secondary side ground terminal. The lighting fixture drive circuit according to claim 1.   The plurality of output transformers are two one-input multi-output type output transformers, and each of the secondary high-voltage terminals i, j, k, l of one of the two output transformers; Between the secondary high-voltage terminals p, o, n, m of the other output transformer of the two output transformers, which are in reverse phase to the secondary high-voltage terminals i, j, k, l. The lighting device according to claim 1, wherein a lighting fixture is connected, and the secondary low-voltage terminals a, b, c, d, e, f, g, and h of the two output transformers are grounded. Instrument drive circuit.   The plurality of output transformers are at least three one-input multiple-output type winding transformers, and the secondary side high-voltage terminal of one of the at least three winding transformers and the other windings. The secondary-side high-voltage terminal and the secondary-side high-voltage terminal of opposite phase of one winding transformer in the linear transformer are connected via one or a plurality of lighting fixtures connected in series, 2. The lighting fixture drive circuit according to claim 1, wherein the secondary high-voltage terminal of the wound transformer is connected in a loop.   The lighting device driving circuit according to any one of claims 1 to 6, wherein the secondary winding is constituted by a plurality of wires arranged in parallel.   The output transformer is a winding-type transformer in which a primary winding and a secondary winding are mounted on a bobbin in which a core is inserted, the first secondary winding is wound around the bobbin, and the secondary winding A second secondary winding having the same number of turns as the first secondary winding is wound on an insulating material on the top, and a plurality of secondary windings having the same number of turns are stacked on the bobbin. The luminaire driving circuit according to any one of claims 1 to 6, wherein the luminaire driving circuit is configured.   The primary side of a plurality of output transformers of one input and multiple output type is connected to each other, a lighting fixture is connected to the secondary side of each output transformer, and a plurality of high voltage outputs are induced on the secondary side of each output transformer. A lighting device driving circuit for lighting a lighting device, wherein all secondary output terminals of each output transformer are connected in series in a closed loop so that secondary output terminals of opposite phases are connected to each other. A luminaire driving circuit comprising a loop circuit, and a luminaire connected between a secondary output end of the output transformer and an output end of another output transformer having a phase opposite to that of the output end.   The lighting device driving circuit according to claim 9, wherein a circuit for detecting an abnormal voltage is connected to a connection point between the secondary output terminal and a secondary output terminal having a phase opposite to that of the secondary output terminal.   The lighting fixture drive circuit according to claim 9, wherein a voltage clamp circuit is connected to a connection point between the secondary output terminal and a secondary output terminal having a phase opposite to the secondary output terminal.   The lighting fixture drive circuit according to claim 9, wherein one side of each of the plurality of coils on the secondary side of the plurality of output transformers is short-circuited to each other. The lighting device driving circuit according to claim 12, wherein a wire that short-circuits one side of each coil on the secondary side is grounded via a high resistance element.   Each of the plurality of output transformers has four secondary coils in the same core, one side of each of the four secondary coils is short-circuited, and the short-circuit wire is grounded through a high resistance element. The luminaire driving circuit according to claim 9, wherein   The plurality of lighting fixtures are arranged in parallel on a substrate so as to be parallel to each other, and terminals at one end adjacent to each other of the lighting fixtures are in reverse phase. Item 10. A lighting device driving circuit according to Item 9.   The primary side of a plurality of output transformers of one input and multiple output type is connected to each other, a lighting fixture is connected to the secondary side of each output transformer, and a plurality of high voltage outputs are induced on the secondary side of each output transformer. A lighting device driving circuit for lighting a lighting device, wherein the secondary output terminals of the output transformers are connected in series in a closed loop so that the secondary output terminals of opposite phases are connected to each other. A lighting fixture driving circuit, wherein a plurality of lighting fixtures are connected to the loop circuit so that reverse-phase voltages are applied to electrodes at both ends.   A luminaire drive for connecting a large number of luminaires to the secondary side of a single output transformer of one input / multiple output type and lighting the luminaires by a high voltage output induced on the secondary side of the output transformer A plurality of secondary output terminals of the output transformer are connected in series in a closed loop so that secondary output terminals of opposite phases are connected to each other to form a loop circuit. A luminaire driving circuit, wherein the luminaires are connected so that a reverse-phase voltage is applied to electrodes at both ends thereof.   The plurality of lighting fixtures are arranged in parallel on a substrate so as to be parallel to each other, and terminals of one end adjacent to each other of the lighting fixtures are in reverse phase. Luminaire driving circuit. The core of the output transformer includes a pair of parallel core portions and a vertical core portion that couples the parallel core portions, and a primary winding is mounted on the vertical core portion of the core portions, and the pair of parallel core portions 10. The drive for a luminaire according to claim 1 or 9, wherein each of the pair of secondary windings is a one-input four-output type winding transformer having a suitable spacing therebetween. circuit. The core of the output transformer is a one-input two-output type winding transformer having a linear core portion, a primary winding being mounted in the middle of the linear core portion, and secondary windings being mounted on both sides thereof. The drive circuit for a luminaire according to claim 1, wherein the drive circuit is for a luminaire. The core of the output transformer has a pair of parallel core portions extending in a linear direction, and a primary winding is mounted in the middle of each of the parallel core portions, and a secondary winding is provided on both sides of each primary winding. 10. The drive circuit for a lighting fixture according to claim 1, wherein the winding transformer is a one-input four-output type to which is mounted. A pair of parallel core portions and a coupling core portion having a U-shaped cross section connected to both ends of the parallel core portions, and a primary winding is mounted in the middle of each of the pair of parallel core portions; A secondary winding is mounted on both sides of the secondary winding to form a 1-input 4-output type winding transformer, an AC signal is input to the primary winding, and a high-voltage output is induced in the secondary winding. The plurality of lighting fixtures are driven by the high-voltage output, and one of the plurality of lighting fixtures connected in series with each other is connected to the plurality of secondary lighting fixtures. Connected to one high-voltage output terminal in the winding, and the electrode on the other side of the one or a plurality of luminaires connected in series with each other has a phase opposite to the high-voltage output terminal of the secondary winding, A luminaire connected to a high-voltage output terminal of another secondary winding among the plurality of secondary windings Dynamic circuit.

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