JPH08264288A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE: To reduce radiation noise by lighting lamps through first and second inverters as synchronizing with an oscillation current fed to first lamp through first and second transformers. CONSTITUTION: The inverter I1 synchronistically oscillates with an oscillation current fed to first lamp L1 by first transformer CT1 so as to light the lamp L1 . The inverter I2 synchronistically oscillates with an oscillation current fed to second lamp L2 by second transformer CT2 so as to light the lamp L2 . Then, the inverter I1 conducts self-oscillation, and the inverter I2 conducts separate oscillation. The oscillation of the inverter I, is interlinked with the ring core 13 of the transformer CT2 so that flux is generated in the magnetic amount cross section of the core 13 to couple mutually through electromagnetic induction. Then, since the inverter I1 , I2 are synchronized with each other so as to oscillate with the same frequency and the same phase, when an apparatus is wired so that the directions of the lamp currents I1 , I2 are reverse to each other, radiation noise is cancelled even in the case of separated lighting. Thereby, plural lamps can be lighted by a ballast for single lamp.

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.

[0002]

2. Description of the Related Art As a method of lighting an N-light luminaire, generally, one N-ballast ballast is used for individual lighting, and collective lighting with one N-ballast ballast is used. N is a number of 2 or more. The individual lighting system oscillates at its own oscillation frequency. However, in the collective lighting system, N oscillation circuits are formed on a single printed circuit board, and each individual oscillation system oscillates at its own oscillation frequency as in the individual lighting system. There is a single oscillation in which a load is connected in series or in parallel with one oscillation circuit.

On the other hand, the radiation noise of the lamps increases as the number of lamps increases.
Since there is a tendency to add, for N lights it is in the fixture for N lights
You need to pay attention to the wiring. For example, N other than one light
Of the lights, the one for two lights has the highest ratio, so one for two lights
Explaining in parallel lighting of single oscillation of bulk lighting method, it is shown in FIG.
As shown, lamp L ₁Lamp current i₁And lamp L
₂Lamp current i₂Have the same frequency and phase
It In this case, wiring as shown in FIG.
180 degrees out of phase ramp L₁, L₂Radiation from
Radiation noise is always the opposite of the current direction, so radiation noise
Are offset. P₁~ P_Four, B₁~ B_FourIs a terminal.
Therefore, when the number of lights is increased, the same function as in the case of two lights is used.
It is possible to cancel the radiation noise by setting it as a key.
I can wait.

On the other hand, the one-lamp ballast has versatility because it can be used with any number of lighting fixtures. Since the frequencies are different, the directions of the lamp currents of the two lamps are not always reversed, no matter how the wiring inside the fixture is wired.
Therefore, the radiation noise is not reduced, and the noise level of the odd harmonics of each frequency becomes high, and as a result, the noise level becomes high in a wide band of frequencies.

For example, a self-excited type 1 which synchronizes with an oscillating current
An example of a ballast for a lamp is shown in FIG. This ballast is half
Ridge configuration and lamp L₀Lamp current i₃And preheat
Current i_FourThe oscillation current i, which is the sum of
Of the secondary winding 6a, 7a
Voltage is generated in the switching element of the transistor
Q ₁, Q₂Alternately turn on, inductor L, lamp L
₀, Capacitor C₁, C₂Generates oscillating current in the load circuit
To do. That is, a start-up circuit (not shown)
Itching element Q₂Switch by applying voltage to the gate of
Element Q₂Turn on the capacitor C₁From lamp L
₀A current flows while drawing an arc of resonance via. Next
A positive voltage is generated in the winding end direction of the secondary winding 6a,
A negative voltage is generated at the beginning of the winding of the secondary winding 7a.
Pressure is gate resistance R₁, R₂Join the gate through
Switching element Q₁Turns on and the switching element
Q₂Turns off. This allows the capacitor C₁Accumulated in
The electric charge that was being charged is the lamp L₀Via lamp L₀Discharge to
It After that, switching elements Q₂, Q₁On and off
I do.

As shown in FIG. 9, the current transformer CT is wound around the ring core 30, and the pin 31 of the pedestal 32 to which the pin 31 is fixed and the ends of the windings 5a, 6a and 7a are fixed by soldering. It Therefore, the current transformer CT is mounted and soldered on the printed wiring board as one electronic component to form a circuit.

[0007]

As shown in FIG. 7, in the method of driving the switching element in synchronization with the oscillation current,
Since self-excited oscillation occurs because it synchronizes only with its own oscillation, there is a drawback that the noise level is high because the illuminating equipment for N lamps using such N 1-ballasts has different oscillation frequencies.

Therefore, an object of the present invention is to illuminate a plurality of lamps with a single ballast,
It is an object of the present invention to provide a discharge lamp lighting device capable of reducing radiation noise.

[0009]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device including a first lamp and a second lamp arranged in parallel, and a signal input section for inputting an oscillation signal, and the output section is the output section. A first inverter connected to the first lamp to output an oscillating current synchronized with the oscillating signal to the first lamp; and a primary winding interposed in series with the first lamp
A first transformer having a next winding connected to the signal input section of the first inverter, and a signal input section for inputting an oscillation signal, and an output section connected to the second lamp for the oscillation signal. A second inverter for outputting an oscillating current synchronized with the second lamp to the second lamp, and a primary winding interposed in series with the first lamp so that the secondary winding has the signal of the second inverter. A second transformer connected to the input section is provided, and the currents flowing through the first lamp and the second lamp are wired in directions opposite to each other.

According to a second aspect of the present invention, there is provided the discharge lamp lighting device according to the first aspect, wherein the first inverter has a first opening in an outer shell thereof.
Exposing the core of the second transformer, exposing the core of the second transformer in the opening of the outer shell of the second inverter, and connecting a lamp wire connecting the output part of the first inverter and the first lamp. Each core is sequentially wound as a primary winding.

[0011]

According to the discharge lamp lighting device of the first aspect, the first inverter oscillates in synchronization with the oscillating current supplied to the first lamp by the first transformer to illuminate the first lamp and the second lamp. The inverter oscillates in synchronization with the oscillation current supplied to the first lamp by the second transformer and lights the second lamp. For this reason, since oscillating currents having the same frequency and the same phase flow in the first lamp and the second lamp, by arranging the first lamp and the second lamp in parallel and making the directions of the lamp currents opposite to each other. , Radiation noise can be canceled out. Therefore, the radiation noise can be reduced in the case where a plurality of lamps are each lit by the one-lamp ballast.

According to the discharge lamp lighting device of the second aspect, in the first aspect, the first inverter exposes the core of the first transformer in the opening of the outer shell thereof, and the second inverter has the outer portion thereof. Expose the core of the second transformer in the opening of the shell,
The lamp wire connecting the output part of the first inverter and the first lamp is sequentially wound around each core as a primary winding. Therefore, in addition to the function of claim 1, a plurality of lamp wires of the first lamp are provided. By sequentially winding around the core of the inverter, the wiring inside the device can be facilitated, the wiring inside the device of the lamp wire can be fixed, and the number of lamps can be easily increased or decreased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. That is, this discharge lamp lighting device includes a first lamp L ₁ , a second lamp L _2, and a first inverter I 2.
₁ , the second inverter I ₂ , and the first transformer CT ₁
And a second transformer CT ₂ .

First lamp L₁And the second lamp L₂
Are arranged in parallel with each other (not shown). Also the first
Lamp L₁And the second lamp L₂The currents flowing through each other
Wired in the opposite direction. C₂Is the first run
L₁And the second lamp L ₂Installed in the preheating circuit of
It is a capacitor. First inverter I₂Is the oscillation signal
Has signal input sections 1 and 2 for inputting
1 lamp L₁Connected to the
Flow the first lamp L₁Electronic ballast for single output
Is. The one-ballast ballast of the embodiment basically has the same configuration as in FIG.
And was connected in series to the DC power supply E and the DC power supply E
Switching element Q of a pair of transistors₁, Q₂When,
A capacitor connected between the output unit 3 and the positive electrode of the DC power source E.
Sensor C₁And output unit 4 and switching element Q₁, Q₂of
And an inductor L connected to the connection point. R
₁, R₂Is the signal input section 1 and 2 and the switching element Q₁,
Q₂Is the gate resistance connected between the gate and So
Then, the first lamp L is provided between the output units 3 and 4.₁Are connected.
The first inverter I₁The operation of will also be explained with reference to FIG.
It is the same as

On the other hand, as shown in FIG. 2, an opening 12 having an inner diameter of a ring core is formed in an outer shell 11 of the ballast for a single lamp. The first transformer CT ₁ is a current transformer, and the primary winding 5a is inserted in series with the first lamp L ₁ so that the secondary windings 6a and 7a have a signal input portion of the _first inverter I _1. 1 and 2 are connected. In the embodiment, the secondary winding 6a is connected between the signal input unit 1 and the output unit 4, and the secondary winding 7a is connected between the signal input unit 2 and the source side of the switching element Q _2. There is. Further, as shown in FIG. 2, the ring core 13 of the first transformer CT ₁ is exposed in the opening 12. As shown in FIG. 3, the ring core 13 is formed by covering the ring core 13 with a pair of molded product covers 15 and 16 so as to sandwich the ring core 13 and adhering a pedestal 18 provided with a pin 17 to the inside of the outer shell thereof. Secondary winding 6
A and 7a are wound and both ends are soldered to the pin 17, and the positioning dimension of the ring core 13 is designed so that the hole 13a of the inner diameter of the ring core 13 is located outside the outer shell 11 of the ballast. Further, the primary winding 5a has one end connected to the output portion 4 and the other end connected to _one pole of the lamp L ₁
It uses a lamp wire 10 has one end connected to the terminal 4a of the output unit 4 as shown in FIG. 2, the first inverter I ₁
The outer side of the outer shell 11 of the first transformer CT ₁
It is wound around the hole 13a of the ring core 13. That is, the first transformer CT ₁ of the embodiment has the secondary winding 6
A part wound only with a and 7a is prepared, mounted on the printed wiring board of the first inverter I ₁ and soldered, and the primary winding 5a
Is then wound outside the outer shell 13 as a part of wiring of a device such as a ballast, so that a predetermined electric current is coupled. If the other end of the lamp line 10 is connected to _one pole of the first lamp L ₁ , the circuit becomes similar to that of FIG. 7.

The second inverter I ₂ has signal input portions 1'and 2'for inputting an oscillating signal, and output portions 3'and 4'are connected to the second lamp L ₂ to synchronize with the oscillating signal. It is an electronic ballast for one lamp that outputs the oscillated current to the second lamp L ₂ . The embodiment has the same configuration as that of the first inverter I _1, and common parts are denoted by the same reference numerals. The outer shape of the second inverter is also similar to that of FIG.
Is provided.

The second transformer CT ₂ is a current transformer, and the primary winding 5a 'is inserted in series with the first lamp L ₁ so that the secondary windings 6a' and 7a 'are second inverters. It is connected to the signal input sections 1'and 2'of I ₂ . Secondary winding 6a of Example ', 7a' is provided so as to be exposed to the opening 12 of the first is similar to the connection of the transformer CT _1, also the ring core 13 and the second inverter I ₂ of the outer shell 11 This is also the same as the first transformer CT ₁ . on the other hand,
Primary winding 5a 'is using the first ramp line 10 of the lamp L _1, primary winding second after connecting to 5a transformer CT ₂
Is wound around a ring core 13 of which the end is connected to _one pole of the first lamp L ₁ .

Therefore, the first inverter I ₁ with the ring core 13 of the first transformer CT ₁ exposed and the second inverter I ₂ with the ring core 13 of the second transformer CT ₂ exposed are installed in the lighting fixture. The lamp wire 10 of the first lamp L ₁ is sequentially wound around each ring core 13, and both ends of the lamp wire 10 of the first lamp L ₁ are connected to the output portion 4 of the first inverter I ₁ and the first inverter I ₁ .
1 is formed by connecting it to _one pole of the lamp L ₁ .

In this embodiment, the first inverter I ₁ is self-excited oscillation synchronized with its own oscillation current, and the second inverter I ₂ is self-excited oscillation synchronized with the oscillation current of the first inverter I _1. Become. Further, the oscillation current of the _first inverter I ₁ is linked to the ring core 13 of the second transformer CT ₂ of the second inverter I ₂ to generate a magnetic flux in the magnetic quantity cross section of the ring core 13, and the coupling is established by electromagnetic induction. To be As a result,
The first inverter I ₁ and the second inverter I ₂ are synchronized and oscillate at the same frequency and the same phase. For this reason,
As shown in FIG. 5, if the lamp currents i ₁ and i ₂ are wired so that the directions thereof are opposite to each other, the phases are 180 degrees out of phase even if they are individually lit, and the directions of the currents are always opposite to each other to cancel the radiation noise. It will be. Therefore, the radiation noise can be reduced in the case where a plurality of lamps are each lit by the one-lamp ballast.

Further, the first inverter I₁Is its outer shell 1
1st transformer CT in opening 12 of 1 ₁The core 13 of
And the second inverter I₂In the opening 12 of the outer shell 11
Second trans CT₂Exposing the core 13 of the
Barta I₁Output parts 3 and 4 and the first lamp L₁Connect to
Winding lamp wire 10 as primary winding around each core 13
Therefore, the first lamp L₁The lamp line 10 of
Inverter I₁, I₂By sequentially winding it around the core 13 of
Wiring inside the device becomes easier and the wiring inside the
Also, it is easy to deal with the increase and decrease in the number of lamps.
Can be.

That is, the ballasts for individual lighting can be synchronized by magnetic coupling without electrical connection at the time of wiring of the lighting equipment, and versatility can be achieved without preparing ballasts according to the number of lights. A single ballast for one lamp oscillates with the same period and the same phase to reduce noise. In the case of a discharge lamp lighting device having three or more lamps, the number of inverters of the second inverter I ₂ is two or more, and for example, the oscillation current of one lamp lit by the ballast for one lamp is used for the remaining one lamp. Similarly, synchronization can be achieved by passing the current through the primary winding of the transformer core of the ballast.

Further, since the primary winding is wound around the ring core 13 exposed from the outer shell of the inverter, the wiring of the lighting fixture can be simplified. On the contrary, the secondary winding is used as the fixture wiring, and the primary winding is It may be pre-wound as a component inside the ballast.

[0023]

According to the discharge lamp lighting device of the first aspect, the first inverter oscillates in synchronization with the oscillating current supplied to the first lamp by the first transformer to illuminate the first lamp, The second inverter oscillates in synchronization with the oscillating current supplied to the first lamp by the second transformer and lights the second lamp. Therefore, the first lamp and the second lamp are oscillated with the same frequency and in the same phase.
The radiation noise can be canceled by arranging the above lamp and the second lamp in parallel and making the directions of the lamp currents opposite to each other. Therefore, there is an effect that the radiation noise can be reduced in the case where a plurality of lamps are each turned on by a single ballast.

According to the discharge lamp lighting device of the second aspect, in the first aspect, the first inverter exposes the core of the first transformer in the opening of the outer shell thereof, and the second inverter has the outer portion thereof. Expose the core of the second transformer in the opening of the shell,
The lamp wire connecting the output part of the first inverter and the first lamp is sequentially wound around each core as a primary winding. Therefore, in addition to the effect of claim 1, a plurality of lamp wires of the first lamp are provided. By sequentially winding around the core of the inverter, the wiring inside the device can be facilitated, the wiring inside the device of the lamp wire can be fixed, and the number of lamps can be easily increased or decreased.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is an external perspective view of an inverter provided with a transformer.

FIG. 3 is a cross-sectional view of a transformer core.

FIG. 4 is a circuit diagram of a conventional example.

FIG. 5 is a wiring diagram thereof.

FIG. 6 is a waveform diagram showing a pair of lamp currents.

FIG. 7 is a circuit diagram of a self-excited discharge lamp lighting circuit.

FIG. 8 is an explanatory diagram of the current transformer.

FIG. 9 is a schematic perspective view of a current transformer.

[Explanation of symbols]

I ₁ 1st inverter I ₂ 2nd inverter CT ₁ 1st transformer CT ₂ 2nd transformer L ₁ 1st lamp L ₂ 2nd lamp 1,1 ', 2,2' Signal input part 3, 3 ', 4, 4'output section

Claims (2)

[Claims] 1. A first lamp and a second lamp arranged in parallel, and a signal input section for inputting an oscillation signal, and an output section connected to the first lamp and synchronized with the oscillation signal. A first inverter that outputs an oscillating current to the first lamp, and a primary winding that is inserted in series with the first lamp so that a secondary winding is connected to the signal input unit of the first inverter. A first transformer connected to the second lamp, a signal input section for inputting an oscillation signal, and an output section connected to the second lamp for outputting an oscillation current synchronized with the oscillation signal to the second lamp; Two inverters and a second transformer in which a primary winding is inserted in series with the first lamp and a secondary winding is connected to the signal input section of the second inverter, The currents flowing through the first lamp and the second lamp are opposite to each other Discharge lamp lighting device that is wired so that. 2. The first inverter exposes the core of the first transformer in the opening of its outer shell, and the second inverter exposes the core of the second transformer in the opening of its outer shell,
The discharge lamp lighting device according to claim 1, wherein a lamp wire that connects the output section of the first inverter and the first lamp is sequentially wound around each core as a primary winding.