JPS637404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a lighting fixture using a discharge lamp such as a fluorescent lamp.

(Prior Art) Generally, in lighting equipment using discharge lamps, such as fluorescent lamps, electronic lighting circuits using high-frequency lighting devices have recently come to be used because of their advantages of high performance and efficiency. There is.

(Problems to be Solved by the Invention) It is known that when the above-mentioned discharge lamp is turned on, high-frequency noise is generated when the lamp is turned on and off every half cycle of the power supply. Further, when a discharge lamp is lit at high frequency as described above, this high frequency component is generated from the discharge lamp and the like and is fed back to the power source. Therefore, noise interference (radio noise) becomes a problem for other devices connected to the power supply.

Here, the feedback of the noise to the power supply is either via a circuit line or via stray capacitance that occurs between appliances or electric wires. The former can reliably prevent feedback to some extent due to the circuit configuration, but the latter depends on the positional relationship of the instruments. In particular, when the output line from the lighting circuit to the discharge lamp and the power line to the discharge lamp lighting circuit are close to each other, the noise voltage from the discharge lamp occurring in the output line will be transmitted through the stray capacitance between them.
Alternatively, it may be transmitted to the power supply line by electromagnetic induction, causing large noise in the power supply. Therefore, these must be taken into consideration when assembling and wiring the main body of the device.If the distance between each wire is sufficient, it will be difficult to downsize the device and the wiring work will be complicated. Become.

An object of the present invention is to provide a lighting fixture that maintains a sufficient distance between a power supply line and an output line to a discharge lamp to reduce the amount of noise feedback to the power supply.

[Structure of the invention]

(Means for Solving the Problems) The lighting equipment of the present invention includes a main body case, a discharge lamp lighting circuit component provided in the main body case, an output line connected to the peripheral part, and a central part from the peripheral part. a wiring board having a through hole on the side thereof; a switch arranged below the through hole of the wiring board in the main body case and blinking the discharge lamp; and a switch that is drawn into the main body case from above the wiring board. and a power line connected to the switch through the through hole of the wiring board.

(Function) In the present invention, by passing the power supply line to be switched through the through hole in the center of the wiring board on which the discharge lamp lighting circuit components are installed, the distance between the power line and the output line drawn out from the periphery of the wiring board can be reduced. This is to keep the stray capacitance sufficiently small and reduce the amount of noise feedback to the power supply.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Figure 1 shows a chandelier-like multi-lamp lighting fixture 1.
1 is shown. In FIG. 1, reference numeral 12 denotes a main body case, and this main body case 12 has a discharge lamp lighting circuit described later inside thereof, and is suspended from the ceiling surface of the room by a chain 13. Further, base ends of a plurality of arms 14 extending radially are attached to the outer periphery of the main body case 12.
A lamp 15 is supported at the tip of the lamp. This light fixture 1
Although not shown, an annular discharge lamp such as a fluorescent lamp is provided inside the arm 5, and as shown in FIG.
6 to the discharge lamp lighting circuit inside the main body case 12.

The main body case 12 is constructed as shown in FIGS. 2 and 3. That is, the main body case 12 itself has an open bottom surface, and a main body lower cover 18 having a decorative cover 17 is detachably attached to the open surface.

Reference numerals 20 and 21 denote wiring boards, for example printed circuit boards, which are provided inside the main body case 12 and are connected to a plurality of support screws 24.
They are supported and fixed in a multi-tiered manner with vertical spacing maintained. And the printed circuit board 20,
Circuit parts constituting the discharge lamp lighting circuit are mounted on the plate surface of 21, and the output line 16 is connected to the peripheral edge of the lower printed circuit board 21. Furthermore, through holes 20a and 21b are formed in the printed circuit boards 20 and 21 closer to the center than the peripheral edge.

Reference numeral 26 denotes a power supply line that reaches the top surface of the main body case 12 along the chain 13, passes through a hanging pipe 27 fixed to the top surface of this main body case 12, is drawn into the main body case 12, and is connected to the printed circuit board 20,
It passes through the through holes 20a, 21a from above 21 and is connected to the input section of the discharge lamp lighting circuit configured on the printed circuit boards 20, 21 via a switch 28 for blinking the discharge lamp. The suspension pipe 27 is connected to the lower end of the chain 13 to suspend the main body case 12.

In this embodiment, the switch 28 includes:
Turn on/off by pulling the drawstring 30 led out downward.
It uses a pull switch that operates off. The switch 28 is fixed on the main body lower cover 18 at the lower part of the main body case 12, that is, below the through holes 20a, 21a of the printed circuit boards 20, 21.
It is connected via a terminal 32 to the power supply line 26 passing through the through holes 20a, 21a on the center side of 21. In this way, attach the switch 28 to the lower cover 18 of the main body.
If it is provided on the top, it can be easily maintained or replaced.

Next, the discharge lamp lighting circuit will be explained with reference to FIG.

35 is a commercial power supply, which is connected to contact 2 of the switch 28 above.
It is connected to the rectifier circuit 36 via 8a _-1 . The positive side electric line P of this rectifier circuit 36 is directly connected, and the negative side electric line N is connected via a constant current inductance 37 to an inverter 39 which is a high frequency generator. This inverter 39 is a pair of transistors 40a and 40b connected in a push-pull manner.
The collectors of these transistors 40a and 40b are connected to the primary windings 43a and 43a of the inverter transformer 43, respectively.
The winding start end and winding end of 43b are connected to both ends of the resonant capacitor 42, and each emitter is commonly connected to the negative side electric circuit N, and each base is connected to the positive side through the starting resistor 45a and 45b, respectively. Connect to side electric circuit P. Moreover, this positive side electric circuit P is also connected to the midpoint between the primary windings 43a and 43b.

The inverter transformer 43 is configured as an insulated type, that is, a leakage transformer, and the primary winding 4
In addition to 3a and 43b, a feedback winding 43c and a secondary winding 4
3d each. Here, the feedback winding 43
Reference numeral c is used to alternately turn on and off a pair of transistors 40a and 40b, whose output terminals are connected to the bases of these transistors 40a and 40b, respectively.

The secondary winding 43d is connected to the lamp 1 shown in FIG.
It serves as a power source for lighting the discharge lamps 45 provided in each of the discharge lamps 45, and one end thereof is connected to the dimming inductor 4.
6 and a balance transformer 47 via a dimming contact 28a _-2 connected in parallel thereto. Here, a plurality of the discharge lamps 45, in this case four, are provided, but these are directly connected two at a time and connected in parallel via the balance transformer 47, and the parallel connection point at the bottom of the diagram is Secondary winding 43
Connect to the other end of d. Further, each discharge lamp 45 is connected in parallel with a single-wound filament transformer 49, whose filament windings 49f are respectively connected to the filaments constituting each electrode, and supply preheating power to the filaments. Note that a contact within the switch 28 is used as the dimming contact 28a _-2 .

The discharge lamp lighting circuit is configured on the printed circuit boards 20 and 21 as described above, but in this case, the primary side circuit components including the inverter transformer 43 and the secondary side circuit components are separated from each other and are placed on different printed circuit boards. Attach to 20 and 21.

In the above configuration, when the switch 28 is operated to close the contact 28-a ₁ , AC power is supplied from the commercial power source 35 to the rectifier circuit 36 . Then, after being converted into DC power, it is input to the inverter 39. The inverter 39 performs high-frequency oscillation of approximately 30 KHz, and generates high-frequency power amplitude-modulated with the pulsating current as an envelope on the secondary side of the inverter transformer 43. This high frequency power is transferred to the balance transformer 47
It is supplied to each discharge lamp 45 and each filament transformer 49 via , and lights each discharge lamp 45 . Note that the constant current inductance 37 provided on the primary side allows the inverter 39 to operate stably. In addition, since a dimming inductor 46 is provided on the secondary side, the switch 28 can be operated to
The light can be adjusted arbitrarily by opening and closing 8- _d2 .

Due to the above lighting, noise is generated from the discharge lamp 45, etc., especially when it is turned on and off in each cycle, and the noise tries to be returned to the power source. In this case, the feedback via the circuit line can be reliably reduced to some extent by the circuit configuration as described above, particularly by using an insulated transformer, so feedback due to stray capacitance will be explained here. In this case, the biggest problem is the power line 26 and the output line 16, that is, the balance transformer 4.
7 to the connection line from each discharge lamp 45.

Here, the output line 16 is drawn out from the peripheral edge of the printed circuit board 21 into the arm 14 shown in FIGS. 1 and 2. On the other hand, the power line 26 is the output line 1
It is located through the central part side of each printed circuit board 20, 21 sufficiently away from 6. Therefore, the stray capacitance during this period is extremely small, and as a result, noise on the output line 16 is hardly transmitted to the power supply line 26, and noise generation can be significantly reduced.

Note that in the present invention, a circuit for reducing high frequency noise that is transmitted to the power supply via a circuit line may be provided on the input side of the lighting circuit, and the effects of the present invention can also be obtained in this case. Furthermore, the number of wiring boards may be one.

〔Effect of the invention〕

As described above, according to the present invention, the output line to the discharge lamp is connected to the periphery of the wiring board, and the power line is routed through the through hole provided in the center of the wiring board. The space between the output line and the output line to the discharge lamp can be made sufficiently large, and therefore the stray capacitance and electromagnetic induction between them can be made sufficiently small, and the amount of noise feedback to the power supply can be significantly reduced. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the lighting fixture of the present invention, FIG. 2 is an exploded perspective view showing the main parts of FIG. 1,
FIG. 3 is a sectional view showing the assembled state of FIG. 2, and FIG. 4 is a circuit diagram showing an example of a discharge lamp lighting circuit used in the present invention. 11...Lighting equipment, 12...Body case, 16
...Output line, 20, 21...Printed circuit board as wiring board, 20a, 21a...Through hole, 26...
Power line, 28... Switch, 30... Drawstring, 39
...High frequency generator, 43...Transformer, 45...
...Discharge lamp.

Claims (1)

[Scope of Claims] 1. A main body case, and a wiring board that is provided inside the main body case and has a discharge lamp lighting circuit component mounted thereon, an output line connected to the peripheral edge, and a through hole located closer to the center than the peripheral edge. a switch disposed below the through hole of the wiring board in the main body case to blink the discharge lamp; and a switch drawn into the main body case from above the wiring board through the through hole of the wiring board. A lighting device comprising a power line connected to the switch. 2. The lighting device according to claim 1, wherein a printed circuit board configured in a plurality of layers is used as the wiring board. 3. The lighting circuit for a discharge lamp is a high-frequency generator having an insulated output transformer, and its primary side and secondary side are separated and mounted on different wiring boards. The lighting fixture according to item 1 or 2. 4. The switch is arranged at the lower part of the main body case, and is connected to a power line introduced from above the main body case, and has a drawstring led out downward. The lighting equipment according to any of paragraph 3.