JPS637403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) 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) When a discharge lamp is lit at high frequency as described above, harmonic components of this high frequency are generated from the discharge lamp, etc.
It is returned to the power supply. Therefore, noise interference (radio noise) becomes a problem for other devices connected to the power supply. That is, when a discharge lamp is turned on at a high frequency (for example, 30 KHz), harmonic components of the high frequency are generated when the power source is turned on and off every half cycle, resulting in radio noise (525 KHz to 1605 KHz). In the case of low frequency lighting, since the fundamental wave is generally a commercial frequency of 50 or 60 KHz, almost no radio noise occurs. Furthermore, in the case of high-frequency lighting, parasitic waves occur, and these parasitic waves also fall into the radio noise area.

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.

The purpose of the present invention is to sufficiently increase the distance between the power supply line and the output line to the discharge lamp, and to minimize the length of the power supply line within the main body case so that it can be close to other lighting components. An object of the present invention is to provide a lighting device that minimizes the noise feedback rate and reduces the amount of noise feedback to the power source.

[Structure of the invention]

(Means for Solving the Problems) The lighting device of the present invention includes a main body case, and a circuit component of a lighting circuit that is provided in the main case to face the upper surface of the main case and lights a discharge lamp at high frequency. At the same time, a wiring board to which an output line is connected to the peripheral edge and a part other than the peripheral edge to which the output line of the wiring board is connected to the upper surface of the main body case are formed to face each other, and a power line is introduced into the main body case from the outside. and a blinking switch disposed near the power line introduction part, directly connected to the power line, and interposed between the power line and an input part of the lighting circuit of the discharge lamp. It is prepared.

(Function) In the present invention, the blinking switch interposed between the power supply line and the discharge lamp lighting circuit is provided near the power supply line introduction part in the main body case, and the output line drawn out from the peripheral part of the wiring board Maintain sufficient space between the
By significantly shortening the length of the power line inside the main body case, the proportion of the power line coming close to other lighting components is minimized, and the area facing them is minimized.
This reduces the amount of high frequency noise feedback to the power supply due to stray capacitance or electromagnetic induction.

(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 in the main body case 12 so as to face the upper surface of the main body case 12, and are maintained vertically apart from each other by a plurality of support screws 24. They are supported and fixed in a multi-tiered manner.
Circuit components constituting the discharge lamp lighting circuit are mounted on the surfaces of the printed circuit boards 20 and 21, and the output line 16 is connected to the peripheral edge of the lower printed circuit board 21.

Further, a power line introduction tube 27 forming a power line introduction part is provided at the center of the upper surface of the main body case 12. That is, this power line introduction tube 27 connects the output line 1 of the wiring board 21 to the upper surface of the main body case 12.
6 is connected and is provided so as to face the portion other than the peripheral portion.

Reference numeral 26 denotes a power line, which reaches the top surface of the main body case 12 along the chain 13, passes through a power line introduction tube 27 fixed to the top surface of the main body case 12, is drawn into the main body case 12, and is drawn into the main body case 12, and is connected to the discharge lamp. It is connected via a flashing switch 28 to an input section of a discharge lamp lighting circuit configured on printed circuit boards 20 and 21. The power line introduction tube 27 also serves as a hanging tool, and is coupled to the lower end of the chain 13 to suspend the main body case 12.

In this embodiment, the blinking switch 28 is a pull switch that is turned on and off by pulling a drawstring 30 led out downward. This flashing switch 28 is connected to the main body case 1.
2, in the vicinity of the power line introduction part 2, that is, directly below the power line introduction tube 27, is fixed upwardly on the upper printed circuit board 20 together with other parts,
It is directly connected to the power supply line 26 via the terminal 32. When the flashing switch 28 is installed on the upper printed circuit board 20 in this way, the main body case 12
The internal space can be used effectively and the height dimension can be reduced.

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

35 is a commercial power source, which is connected to the rectifier circuit 36 via the contact 28a- ₁ of the blinking switch 28.
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 has a pair of transistors 40a and 40b connected in a push-pull manner, and the collectors of these transistors 40a and 40b are connected to the primary winding 43 of an inverter transformer 43.
a, 43b are connected to the winding start end and winding end end and 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 through a starting resistor 45a, 45b, respectively. Connect to the above positive 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 the contact within the blinking 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. That is, the primary side circuit components are mounted upward on the upper printed circuit board 20 close to the power line introduction tube 27 together with the flashing switch 28, and the secondary side circuit components are located away from the power line introduction tube 27. It is attached to the lower printed circuit board 21 facing downward.

In the above configuration, when the blinking 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 supplied to each discharge lamp 45 and each filament transformer 49 via a balance transformer 47, 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, a dimming inductor 46 is provided on the secondary side.
, the light can be adjusted arbitrarily by operating the flashing switch 28 to open and close the contact 28-d ₂ .

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 distance between the power supply line 26 and the secondary circuit components, especially the output line 16, that is, the connection line from the balance transformer 47 to each discharge lamp 45.

Here, the secondary circuit components are mounted on the lower printed circuit board 21 facing downward, and the output line 16 is inserted from the periphery of the lower printed circuit board 21 into the arm 14 shown in FIGS. 1 and 2. be drawn out. On the other hand, the power line 26 is located close to the upper power line introduction tube 27 inside the main body case 12 and sufficiently away from the output line 16 and the like. Therefore, the stray capacitance between these lines is extremely small, so that the noise on the output line 16 is hardly transmitted to the power line 26.
Noise generation can be significantly reduced. At this time, the distance between the power supply line 26 and the output line 16 is further increased by arranging the printed circuit boards 20 and 21 in two stages, upper and lower, and connecting the output line 16 to the lower printed circuit board 21.

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, and even in this case, the blinking switch 28
The power line 26 may be disposed close to the power line introduction part so as not to come close to the output line 14 to the discharge lamp 45, etc.

〔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 flashing switch connected to the power line is provided close to the power line introduction part of the main body case. , the distance between the power supply line and the lighting components that have high-frequency noise, such as the output line to the discharge lamp, can be made sufficiently large, and the length of the power supply line inside the main body case can be minimized so that it is close to other lighting components. It is possible to minimize the ratio between the two and the area where they face each other, so that the stray capacitance and electromagnetic induction between them can be sufficiently reduced, and the amount of noise feedback to the power supply can be significantly reduced.

[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 a wiring board, 26 ... Power line, 27 ... Power line introduction tube forming a power line introduction part, 28 ... Flashing switch, 30 ... Draw string, 39 ...High frequency generator, 4
3...Transformer, 45...Discharge lamp.

Claims (1)

[Scope of Claims] 1. A main body case, in which circuit components for a lighting circuit that is provided facing the upper surface of the main body case and lights up a discharge lamp at high frequency are installed, and an output line is connected to the peripheral portion. a wiring board; a power line introduction part that is formed on the upper surface of the main body case to face a portion other than the peripheral edge where the output line of the wiring board is connected and that introduces a power line from the outside into the main body case; the power line; A lighting device comprising: a blinking switch disposed near the introduction part, directly connected to the power supply line, and interposed between the power supply line and the input part of the lighting circuit for the discharge lamp. . 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 with an isolated output transformer, and its primary side circuit components are attached to a wiring board close to the power line introduction part along with a flashing switch, and its secondary side circuit components are attached to the power supply line. 3. The lighting device according to claim 1, wherein the lighting device is mounted on a wiring board located away from the wire introduction section. 4. Claim 1, characterized in that the flashing switch is disposed at the upper part of the main body case, is connected to a power supply line introduced from above the main body case, and has a drawstring led out downward. The lighting equipment according to any one of paragraphs 1 to 3.