JP2002110383A - Lighting device of discharge lamp and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device of a discharge lamp that is capable of lighting other discharge lamps even if some out of plural discharge lamps are disconnected. SOLUTION: When an electric power is inputted, a base drive circuit 5 starts operation and, by the base drive circuit 5, the transistor Q1 is put in high frequency switching action and resonates by the parallel resonance circuit 3, and a resonance voltage is generated respectively in the secondary coils Tr1b1, Tr1b2. As the voltage of the capacitors C4, C5 is increased, the voltage of the fluorescent lamps FL1, FL2 increases and the fluorescent lamps FL1, FL2 are started and lighted in high frequency. Since each of the fluorescent lamps FL1, FL2 is connected with each of the secondary soils Tr1b1, Tr1b2 separately even if one of the fluorescent lamps FL1, FL2 is disconnected, the other of the fluorescent lamps FL1, FL2 can be lighted as the other of the fluorescent lamps FL1, FL2 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting a discharge lamp and a lighting device.

[0002]

2. Description of the Related Art Conventionally, as a discharge lamp lighting device of this type, for example, a configuration shown in FIG. 10 is known.

In the discharge lamp lighting device shown in FIG. 10, a full-wave rectifier circuit 1 is connected to a commercial AC power supply e, and an output terminal of the full-wave rectifier circuit 1 is connected to a smoothing capacitor C1.
The inverter circuit 2 is connected to the capacitor C1.

[0004] A parallel resonance circuit 3 is connected to the inverter circuit 2. This parallel resonance circuit 3
The resonance inductor L1 and the coupling coefficient are 0.8 to 1.
It has a resonance inductance circuit 4 for the primary winding Tr1a of the tightly coupled inverter transformer Tr1, and a resonance capacitor C2 that resonates with the resonance inductance circuit 4. A transistor Q1 as a switching element is connected in series to the parallel resonance circuit 3. Further, a base drive circuit 5 as drive means is connected to the transistor Q1, and a start-up resistor R1 is connected to the base drive circuit 5.

The secondary winding T of the inverter transformer Tr1
A load circuit 6 is connected to r1b. The load circuit 6 has a fluorescent lamp FL1 and a fluorescent lamp FL2 as discharge lamps connected in series, and a secondary winding Tr1b of an inverter transformer Tr1.
One end of a filament FL1a of the fluorescent lamp FL1 and one end of a filament FL2b of the fluorescent lamp FL2 are connected. Between the other end of the fluorescent lamp FL2 and the other end of the filament FL2b of the fluorescent lamp FL2.
Is connected.

When the power is turned on, the starting resistor R1
, The base drive circuit 5 starts operating, the base drive circuit 5 causes the transistor Q1 to perform a high-frequency switching operation, and the inductor L1 of the resonance inductance circuit 4 of the parallel resonance circuit 3 resonates with the resonance capacitor C2. When a resonance voltage is generated in the secondary winding Tr1b and the voltage of the capacitor C3 increases, the voltage between the filament FL1a of the fluorescent lamp FL1 and the filament FL2b of the fluorescent lamp FL2 increases, and the fluorescent lamp FL1 and the fluorescent lamp FL2 starts and is lit high frequency.

[0007]

However, in the discharge lamp lighting device shown in FIG. 10, when one of the fluorescent lamp FL1 and the fluorescent lamp FL2 is removed, a closed circuit is formed in the load circuit 6. Therefore, there is a problem that one of the fluorescent lamp FL1 and the fluorescent lamp FL2 does not light up.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a discharge lamp lighting device and a lighting device capable of lighting another discharge lamp even if any of the plurality of discharge lamps is removed. With the goal.

[0009]

A discharge lamp lighting device according to claim 1 includes inverter means for lighting a discharge lamp;
A primary winding provided in the inverter means, and a transformer having a plurality of secondary windings which are magnetically connected to the primary winding, are respectively connected to the discharge lamps, and are electrically connected to at least one of the primary windings. The discharge lamp is turned on by the inverter means, and the discharge lamp is connected to each of the plurality of secondary windings of the transformer of the inverter means. Discharge lamps that are not removed because a closed circuit is formed are lit, and the secondary winding is electrically connected to other secondary windings to eliminate the loss due to the middle dotted current, Alternatively, the electric shock current of the discharge lamp is suppressed.

According to a second aspect of the present invention, there is provided a discharge lamp lighting device, comprising: a primary winding; and a plurality of secondary windings which are magnetically connected to the primary winding, are respectively connected to the discharge lamp, and are electrically connected to at least one of them. A transformer having a secondary winding; a resonance inductance circuit; and a resonance circuit having a resonance capacitor resonating with the resonance inductance circuit; a switching element connected to the resonance circuit; and a drive for controlling the switching element. Means for inducing a voltage in a secondary winding of a transformer by a switching element controlled by a resonance circuit and a drive circuit to light a discharge lamp, and discharging a discharge lamp to a plurality of secondary windings of the transformer, respectively. If one of the discharge lamps is removed, the other discharge lamps are closed. The discharge lamp that has not been removed because it is formed lights up, and the secondary winding is electrically connected to other secondary windings to eliminate the loss due to the midpoint dotted current, or Suppresses electric shock current.

According to a third aspect of the present invention, there is provided a discharge lamp lighting device comprising: a rectifier for rectification connected to an AC power supply; a first capacitor connected to an output side of the rectifier; and an output side of the first capacitor. A diode connected and connected to the rectifier in a forward polarity, a second capacitor connected in parallel to a series circuit of the diode and the first capacitor, and a rectifier connected in parallel to the second capacitor. Harmonic suppression means including a partial smoothing circuit having a charging capacitor charged at a voltage equal to or less than the maximum instantaneous value; a primary winding connected to the harmonic suppression means; A transformer having a plurality of secondary windings connected to each other and electrically connected to at least one of the discharge lamps; a resonance inductance circuit; A resonance circuit having a resonance capacitor that resonates with a resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element, and a waveform is improved by the harmonic suppression means. In addition to improving the power factor and suppressing harmonics, the switching element controlled by the resonance circuit and the drive circuit induces a voltage in the secondary winding of the transformer to turn on the discharge lamp, and the multiple secondary transformers By connecting a discharge lamp to each winding, even if one of the discharge lamps is removed, the other discharge lamps are closed because the closed circuit is formed. By electrically connecting the wire to other secondary windings, the loss due to the middle dotted current can be eliminated, or Pump of suppressing the lightning current.

According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device comprising: a rectifier for rectification connected to an AC power supply; a first capacitor connected to an output side of the rectifier; and an output side of the first capacitor. A diode connected in forward polarity to the rectifier, a second capacitor connected in parallel with the diode, and a first capacitor and a second capacitor connected in parallel to the diode.
Harmonic suppression means having a partial smoothing circuit having a charging capacitor connected in parallel to a series circuit of capacitors and charged with a voltage equal to or less than the maximum instantaneous value of the rectification means; and a primary connected to the harmonic suppression means. A winding, and a transformer having a plurality of secondary windings that are magnetically connected to the primary winding, are respectively connected to the discharge lamp, and are electrically connected to at least one of the windings; a resonance inductance circuit; A resonance circuit having a resonance capacitor that resonates with the resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element. A switch controlled by a resonance circuit and a drive circuit that improves the power factor and suppresses harmonics. A voltage is induced in the secondary winding of the transformer by the switching element to turn on the discharge lamp, and by connecting the discharge lamp to each of the multiple secondary windings of the transformer, one of the discharge lamps is removed. In addition, other discharge lamps are closed, so the discharge lamps that have not been removed are turned on, and the secondary winding is electrically connected to the other secondary windings, resulting in the loss due to the midpoint dotted current. Or suppress the electric shock current of the discharge lamp.

According to a fifth aspect of the present invention, there is provided a discharge lamp lighting device comprising: a first capacitor connected to an AC power supply; a rectifier having an input connected in parallel with the first capacitor; and an output connected to the rectifier. A second capacitor connected in parallel with the second capacitor and a partial smoothing circuit having a charging capacitor charged with a voltage equal to or less than the maximum instantaneous value of the rectifier; A transformer having a primary winding connected to the means, and a plurality of secondary windings magnetically connected to the primary winding and connected to the discharge lamp and electrically connected to at least one of the primary windings; Inductance circuit, and
A resonance circuit having a resonance capacitor that resonates with the resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element. To improve the power factor, suppress harmonics, induce a voltage in the secondary winding of the transformer by a switching element controlled by the resonance circuit and the drive circuit, and turn on the discharge lamp. By connecting a discharge lamp to each of the secondary windings, even if one of the discharge lamps is removed, the other discharge lamps are closed because a closed circuit is formed. By electrically connecting the winding to other secondary windings, the loss due to the middle dotted current can be eliminated or Lamp of suppressing the lightning current.

According to a sixth aspect of the present invention, there is provided a discharge lamp lighting device according to any one of the first to fifth aspects.
The transformer has two secondary windings and the secondary windings are connected in the same phase.By connecting the secondary windings in the same phase, the current flowing through the middle dotted line is eliminated. Eliminates the loss of the dotted line and improves efficiency.

According to a seventh aspect of the present invention, there is provided a discharge lamp lighting device according to any one of the first to fifth aspects.
The transformer has two secondary windings, and the secondary windings are connected in opposite phases. By connecting the secondary windings in opposite phase, the potential at both ends of the discharge lamp is reduced. , Suppresses the electric shock current of the discharge lamp.

According to an eighth aspect of the present invention, there is provided an illuminating device comprising: the discharge lamp lighting device according to any one of the first to seventh aspects; and a fixture main body to which a discharge lamp lit by the discharge lamp lighting device is mounted. Thus, the respective functions are achieved.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention. Parts corresponding to those of the conventional example shown in FIG.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device, and FIG. 2 is a perspective view showing the appearance of the lighting device.

As shown in FIG. 2, the lighting device 11 has a fixture main body 12, and reflection surfaces 13, 13 are formed on the lower surface of the fixture main body 12, and lamps are provided on both ends of the reflection surfaces 13, 13, respectively. Sockets 14 and 14 are installed, these lamp sockets
Fluorescent lamps FL1 and FL2 as discharge lamps are respectively mounted between 14 and 14, and the discharge lamp lighting device shown in FIG.

In this discharge lamp lighting device, as shown in FIG. 1, an input terminal of a full-wave rectifier circuit 1 composed of, for example, a diode bridge or the like is connected as a rectifier to a commercial AC power source e. A smoothing capacitor C1 is connected to an output terminal of the wave rectifier circuit 1, and an inverter circuit 2 as inverter means is connected to the capacitor C1.

A parallel resonance circuit 3 is connected to the inverter circuit 2. This parallel resonance circuit 3
The resonance inductor L1 and the coupling coefficient are 0.8 to 1.
It has a resonance inductance circuit 4 for the primary winding Tr1a of the tightly coupled inverter transformer Tr1, and a resonance capacitor C2 that resonates with the resonance inductance circuit 4. A transistor Q1 as a switching element is connected in series to the parallel resonance circuit 3. Further, a base drive circuit 5 as drive means is connected to the transistor Q1, and a start-up resistor R1 is connected to the base drive circuit 5.

The inverter transformer Tr1 includes a plurality of, for example, two secondary windings Tr1b electrically connected to each other.
1 and Tr1b2, and a load circuit 6 is connected to these secondary windings Tr1b1 and Tr1b2.
One end of each of the filaments FL1a and FL1b of the fluorescent lamp FL1 is connected to 1b1, and a starting capacitor C4 is connected between the other ends of the filaments FL1a and FL1b. The filaments FL2a and FL2b of the fluorescent lamp FL2 are connected to the secondary winding Tr1b2.
Is connected between the other ends of the filaments FL2a and FL2b of the fluorescent lamp FL2.
Is connected.

Next, the operation of the above embodiment will be described.

First, when the power is turned on, the base drive circuit 5 starts operating via the starting resistor R1, the transistor Q1 is switched by the base drive circuit 5 at a high frequency, and the resonance inductance circuit 4 of the parallel resonance circuit 3 is turned on. Resonates with the inductor L1 and the resonance capacitor C2,
A resonance voltage is generated in each of the secondary winding Tr1b1 and the secondary winding Tr1b2.

When the voltage of the capacitor C4 increases, the voltage of the fluorescent lamp FL1 increases, and the fluorescent lamp F1 increases.
L1 is started to perform high-frequency lighting, and the voltage of the capacitor C5 is increased, so that the voltage of the fluorescent lamp FL2 is increased to start the fluorescent lamp FL2 and perform high-frequency lighting.

As described above, each secondary winding Tr1b1, T2
By connecting the fluorescent lamps FL1 and FL2 to r1b2, respectively, even if one of the fluorescent lamps FL1 and FL2 is removed, one of the fluorescent lamps FL1 and FL2 forms a closed circuit. Either of FL2 can be turned on.

When the secondary windings Tr1b1 and Tr1b2 are connected in the same phase as shown in FIG. 3, for example, the fluorescent lamp FL1
The current I1 flowing through the fluorescent lamp FL2 and the current I2 flowing through the fluorescent lamp FL2 have substantially the same current value and the directions are opposite to each other.
As shown in FIG. 4, the current loss due to the middle dotted line can be reduced as compared with the case where the secondary windings Tr1b1 and Tr1b2 are separated and independent.

Further, when the secondary windings Tr1b1 and Tr1b2 are connected in opposite phases as shown in FIG.
The voltage V1 applied to 1 and the voltage V2 applied to the fluorescent lamp FL2 have substantially the same voltage value and opposite polarities, so that the voltage V3 becomes 0, and the voltage V3 can be reduced.
Lightning current of the fluorescent lamps FL1 and FL2 can be reduced.

Next, a discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 6 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. In the discharge lamp lighting device shown in FIG. Is provided.

The harmonic suppression means 16 is connected to a commercial AC power supply e.
Is connected to a first capacitor C11 between the output terminals of the full-wave rectifier circuit 1, and has a switching function in the forward polarity from the positive side of the full-wave rectifier circuit 1. D11 is connected, and the second capacitor C12 is connected to the full-wave rectifier circuit 1 via the diode D11. Further, in parallel with the second capacitor C12, a charging capacitor C13 charged with a voltage value lower than the maximum instantaneous voltage of the diode D11 and an inductor L11
A series circuit of a diode D12 connected to a polarity opposite to that of the diode D11 is connected, and a connection point of the inductor L11 and the diode D12 is connected to the parallel resonance circuit 3 and a collector of the transistor Q1 via a diode D13.

Next, the operation of the discharge lamp lighting device shown in FIG. 6 will be described. The basic operation is the same as that of the discharge lamp lighting device shown in FIG.

When the commercial AC power supply e is turned on, full-wave rectification is performed by the full-wave rectifier circuit 1 to charge the first, second and charging capacitors C11, C12, and C13.

First, a description will be given of a portion where the voltage of the pulsating current rectified by the full-wave rectifier circuit 1 is higher than the charging voltage of the charging capacitor C13.

When the transistor Q1 is turned on, current is supplied from the first capacitor C11 and partly from the second capacitor C12 to the primary winding Tr1a of the inverter transformer Tr1. Since the combined capacitance of the first capacitor C11 and the second capacitor C12 has sufficient energy to drive the inverter circuit 2, the first capacitor
According to the power supply from C11 and the second capacitor C12, energy from the commercial AC power supply e flows as an input current. When the transistor Q1 is turned on, the charging capacitor C13 is charged according to the inductor L11. If the voltage of the pulsating current full-wave rectified by the full-wave rectifier circuit 1 is higher than the charging voltage of the charging capacitor C13, the charging capacitor C13 is not discharged to the inverter circuit 2.

Next, a description will be given of a portion where the voltage of the pulsating current full-wave rectified by the full-wave rectifier circuit 1 is lower than the charging voltage of the charging capacitor C13.

When the transistor Q1 is turned on when the voltage of the pulsating current, which has been full-wave rectified by the full-wave rectifier circuit 1, with respect to the charging voltage of the charging capacitor C13, the transistor Q1 is turned on from the second capacitor C12. Power is supplied to the primary winding Tr1a. Then, since the voltage of the second capacitor C12 is insufficient as energy required by the inverter circuit 2, the voltage of the second capacitor C12 decreases. Thereafter, when the voltage of the second capacitor C12 decreases to the voltage of the first capacitor C11, the first capacitor C11
Supplies energy to the inverter circuit 2. In addition, the full-wave rectifier circuit 1 is used as an input current in such a form as to be supplied from the commercial AC power supply e by an amount corresponding to the discharge amount of the first capacitor C11.
Inflows from. This operation is continued until the transistor Q1 turns off.

On the other hand, the charging voltage of the charging capacitor C13 delays the release of energy due to the inductance of the inductor L11, and releases the energy immediately before the transistor Q1 is turned on.

Thereafter, when the transistor Q1 is turned off, the charging voltage of the charging capacitor C13 is supplied to the inverter circuit 2 by resonance with the inductor L11. In addition, the first capacitor C13 with respect to the charging voltage of the charging capacitor C13
As the voltage at 11 decreases, the amplitude of the inductor L11 and the charging capacitor C13 increases, and the resonance current peaks at the portion where the input current is lowest, and the current flows continuously even when the input current decreases.

As described above, even in a portion where the pulsating current is close to zero, the harmonic current contained in the input current is reduced by making the input current continuous by the harmonic suppression means 16.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 7 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device shown in FIG.
In the discharge lamp lighting device shown in FIG.
C12 is connected in parallel with diode D11.

The discharge lamp lighting device shown in FIG. 7 operates similarly to the discharge lamp lighting device shown in FIG.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 8 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment. The discharge lamp lighting device shown in FIG. 8 is different from the discharge lamp lighting device shown in FIG. The full-wave rectifier circuit 1 is connected between the second capacitors C12, the input terminal of the full-wave rectifier circuit 1 is connected to the first capacitor C11, and the output terminal of the full-wave rectifier circuit 1 is connected to the second capacitor C12. Connected.

The discharge lamp lighting device shown in FIG. 8 operates similarly to the discharge lamp lighting device shown in FIG.

Further, a discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 9 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment. The discharge lamp lighting device shown in FIG. 9 differs from the discharge lamp lighting device shown in FIG. Connect the detection winding CT1a of the current transformer CT1 as the circuit current detection means to the middle dotted line with the next winding Tr1b1 and Tr1b2 connected in phase,
Is connected to the base drive circuit 5.

Then, the fluorescent lamp FL1 and the fluorescent lamp F
When both L2 are normal, since the voltage of the fluorescent lamp FL1 and the voltage of the fluorescent lamp FL2 are almost equal, no current flows through the middle dotted line, and the detection winding CT1a does not detect the current. At the end of life, the fluorescent lamp FL2
The voltage of the fluorescent lamp FL1 is higher than the voltage of the fluorescent lamp FL1, and a current flows through the middle dotted line.
When a is detected, a voltage is induced in the output winding CT1b, and the base drive circuit 5 reduces the amount of base drive to the transistor Q1 and reduces the stress on the transistor Q1.

It should be noted that the configuration shown in FIG.
The same effect can be obtained by using the discharge lamp lighting device shown in FIG.

[0051]

According to the discharge lamp lighting device of the present invention, the discharge lamp is lit by the inverter means, and the discharge lamp is connected to each of the plurality of secondary windings of the transformer of the inverter means. Even if one of the discharge lamps is removed, the other discharge lamps are closed because the other discharge lamps are closed, and the secondary winding is electrically connected to the other secondary windings. As a result, it is possible to eliminate the loss due to the current indicated by the middle dotted line, or to suppress the electric shock current of the discharge lamp.

According to the discharge lamp lighting device of the second aspect,
A voltage is induced in the secondary winding of the transformer by the switching element controlled by the resonance circuit and the drive circuit to light the discharge lamp, and the discharge lamp is connected to each of the plurality of secondary windings of the transformer. Even if one of the discharge lamps is removed, the other discharge lamps are closed because the other discharge lamps are closed, and the secondary winding is electrically connected to the other secondary windings. As a result, it is possible to eliminate the loss due to the current indicated by the middle dotted line, or to suppress the electric shock current of the discharge lamp.

According to the discharge lamp lighting device of the third aspect,
The waveform is improved by the harmonic suppression means to improve the power factor and suppress the harmonics, and the switching element controlled by the resonance circuit and the drive circuit induces a voltage in the secondary winding of the transformer to light the discharge lamp. By connecting a discharge lamp to each of a plurality of secondary windings of a transformer, even if one of the discharge lamps is removed, the other discharge lamps are not removed because a closed circuit is formed. Is turned on, and the secondary winding is electrically connected to another secondary winding, so that the loss due to the current of the middle dotted line can be eliminated or the electric shock current of the discharge lamp can be suppressed.

According to the discharge lamp lighting device of the fourth aspect,
The waveform is improved by the harmonic suppression means to improve the power factor and suppress the harmonics, and the switching element controlled by the resonance circuit and the drive circuit induces a voltage in the secondary winding of the transformer to light the discharge lamp. By connecting a discharge lamp to each of a plurality of secondary windings of a transformer, even if one of the discharge lamps is removed, the other discharge lamps are not removed because a closed circuit is formed. Is turned on, and the secondary winding is electrically connected to another secondary winding, so that the loss due to the current of the middle dotted line can be eliminated or the electric shock current of the discharge lamp can be suppressed.

According to the discharge lamp lighting device of the fifth aspect,
The waveform is improved by the harmonic suppression means to improve the power factor and suppress the harmonics, and the switching element controlled by the resonance circuit and the drive circuit induces a voltage in the secondary winding of the transformer to light the discharge lamp. By connecting a discharge lamp to each of a plurality of secondary windings of a transformer, even if one of the discharge lamps is removed, the other discharge lamps are not removed because a closed circuit is formed. Is turned on, and the secondary winding is electrically connected to another secondary winding, so that the loss due to the current of the middle dotted line can be eliminated or the electric shock current of the discharge lamp can be suppressed.

According to the discharge lamp lighting device of the sixth aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 5, since the secondary windings are connected in phase, by connecting the secondary windings in phase, the current flowing through the middle dotted line is reduced. By eliminating the loss, the loss of the middle dotted line can be eliminated, and the efficiency can be improved.

According to the discharge lamp lighting device of the seventh aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 5, since the secondary winding is connected in an opposite phase, by connecting the secondary winding in an opposite phase, the potential at both ends of the discharge lamp is connected. And the electric shock current of the discharge lamp can be suppressed.

According to the illuminating device of the eighth aspect, since the apparatus main body to which the discharge lamp lit by the discharge lamp lighting device according to any one of the first to seventh aspects is mounted is provided, the respective effects are exhibited. be able to.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a discharge lamp lighting device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of the lighting device.

FIG. 3 is a circuit diagram showing a state in which secondary windings of the inverter transformer are connected in the same phase.

FIG. 4 is a circuit diagram showing a state where a secondary winding of the inverter transformer is separated.

FIG. 5 is a circuit diagram showing a state in which secondary windings of the inverter transformer are connected in opposite phases.

FIG. 6 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 7 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention;

FIG. 8 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment of the present invention.

FIG. 9 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment of the present invention.

FIG. 10 is a circuit diagram showing a conventional discharge lamp lighting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Full-wave rectification circuit as rectification means 2 Inverter circuit as inverter means 3 Resonance circuit 4 Resonance inductance circuit 12 Instrument body 17 Partial smoothing circuit C2 Resonance capacitor C11 First capacitor C12 Second capacitor C13 Charging capacitor D11 Diode FL1, FL2 Fluorescent lamp as discharge lamp Q1 Transistor as switching element Tr1a Primary winding Tr1b1, Tr1b2 Secondary winding

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Tsuji 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo F-term in Toshiba Lighting & Technology Corporation (reference) 3K072 AA02 AB02 AB03 BA03 BB01 BB03 BC01 DB03 DD04 EA02 EB07 GA01 GB04 GC04 HA01

Claims (8)

[Claims] 1. Inverter means for lighting a discharge lamp; a primary winding provided in the inverter means;
A transformer having a plurality of secondary windings that are magnetically connected to the primary winding, are respectively connected to the discharge lamps, and are electrically connected to at least one of the discharge lamps. . 2. A transformer having a primary winding, and a plurality of secondary windings magnetically connected to the primary winding, each connected to a discharge lamp and electrically connected to at least one of the primary winding; A resonance circuit having a resonance capacitor that resonates with the resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element. Discharge lamp lighting device. 3. A rectifier for rectification connected to an AC power supply, a first capacitor connected to an output of the rectifier, and a positive polarity connected to an output of the first capacitor with respect to the rectifier. , A second capacitor connected in parallel with a series circuit of the diode and the first capacitor, and a second capacitor connected in parallel with the second capacitor and charged with a voltage equal to or less than the maximum instantaneous value of the rectifier. Harmonic suppressing means having a partial smoothing circuit having a charging capacitor; a primary winding connected to the harmonic suppressing means; and a discharge lamp magnetically connected to the primary winding and connected to the primary winding. Having a plurality of secondary windings electrically connected to at least one of the transformers; a resonance inductance circuit; and the resonance inductance circuit and the resonance A discharge lamp lighting device comprising: a resonance circuit having a resonance capacitor; a switching element connected to the resonance circuit; and drive means for controlling the switching element. 4. A rectifier for rectification connected to an AC power supply, a first capacitor connected to an output side of the rectifier, and a positive polarity connected to an output side of the first capacitor with respect to the rectifier. , A second capacitor connected in parallel to the diode, and a first
Harmonic suppression means provided with a partial smoothing circuit having a charging capacitor connected in parallel to the series circuit of the capacitor and the second capacitor and charged with a voltage equal to or less than the maximum instantaneous value of the rectifier means; A transformer having a primary winding connected to the primary winding and a plurality of secondary windings magnetically connected to the primary winding and connected to a discharge lamp and electrically connected to at least one of the primary windings; A resonance circuit having an inductance circuit and a resonance capacitor that resonates with the resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element. Discharge lamp lighting device. 5. A first capacitor connected to an AC power supply, a rectifier having an input connected in parallel with the first capacitor, a second capacitor connected to an output of the rectifier, and a second capacitor connected to an output of the rectifier. Harmonic suppression means provided with a partial smoothing circuit having a charging capacitor connected in parallel with the capacitor of the rectifier and charged with a voltage equal to or less than the maximum instantaneous value of the rectifier;
A primary winding connected to the harmonic suppression means, and a plurality of secondary windings which are magnetically connected to the primary winding, are respectively connected to the discharge lamps, and are electrically connected to at least one of them. A transformer; a resonance inductance circuit, and a resonance circuit having a resonance capacitor that resonates with the resonance inductance circuit; a switching element connected to the resonance circuit; and drive means for controlling the switching element. A lighting device for a discharge lamp, comprising: 6. The transformer according to claim 1, wherein the transformer has two secondary windings, and the secondary windings are connected in phase.
6. The discharge lamp lighting device according to any one of claims 5 to 5. 7. The transformer according to claim 1, wherein the transformer has two secondary windings, and the secondary windings are connected in opposite phases.
6. The discharge lamp lighting device according to any one of claims 5 to 5. 8. A lighting device comprising: the discharge lamp lighting device according to claim 1; and a fixture main body to which a discharge lamp to be lighted by the discharge lamp lighting device is mounted. .