JP4428217B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture in which a fixture main body and a discharge lamp lighting device are installed apart from each other.

  2. Description of the Related Art Conventionally, there has been provided a lighting fixture that lights a discharge lamp such as a fluorescent lamp using a discharge lamp lighting device including an inverter circuit that operates at a high frequency.

  In such a lighting fixture, noise generated due to the high frequency output of the inverter circuit when the discharge lamp is lit may be superimposed on the input power line connected to the discharge lamp lighting device and adversely affect other electrical devices. There is. Therefore, when connecting the input power supply line to the printed wiring board on which the lighting circuit including the inverter circuit is mounted, the input power supply line is routed by avoiding the area where the components of the inverter circuit are mounted. There has been proposed a lighting fixture that suppresses the radiant noise (see, for example, Patent Document 1).

  Moreover, as a lighting fixture, a line-type lighting fixture is conventionally provided in which a plurality of lighting fixtures using straight tube fluorescent lamps are directly attached to a ceiling surface so as to be aligned in a line along the longitudinal direction thereof. . Here, when installing a plurality of lighting fixtures in a line, if the metal cases of adjacent lighting fixtures are connected to each other via a non-conductive connector, an electrical connection between the metal cases is obtained. Therefore, the noise superimposed on the input power line tends to deteriorate, so the noise performance can be improved by electrically connecting the metal cases using a coupling tool with a conductive contact surface. An improved lighting fixture has also been proposed (see, for example, Patent Document 2).

  By the way, since the lighting fixture shown by the above-mentioned patent documents 1 and 2 is equipped with the discharge lamp lighting device integrally with the fixture main body which mounts a discharge lamp, the fixture main body becomes large-sized and narrow like the back of a ceiling. Lighting fixtures could not be installed in the installation space. Therefore, by forming the fixture body and the discharge lamp lighting device separately and installing them separately, the lighting fixture is designed to reduce the size of the fixture body and to cope with a small installation space. Traditionally provided.

Such lighting fixtures include, for example, ceiling-mounted lighting fixtures, and are provided with lamp sockets and reflectors for mounting compact lamps such as single-end fluorescent lamps and high-intensity discharge lamps (HID lamps). By forming the main body and the discharge lamp lighting device provided with the inverter circuit operating at high frequency separately, it is possible to flexibly cope with a narrow mounting space such as the back of the ceiling. In addition, since the discharge lamp lighting device is installed away from the discharge lamp, the circuit components constituting the discharge lamp lighting device are not easily affected by the heat radiated from the discharge lamp, and the temperature rise of the circuit components can be reduced. is there.
JP 2000-182785 A JP 2004-127869 A

  However, in the above-mentioned lighting fixture in which the fixture main body and the discharge lamp lighting device are separately provided, the cable length of the lamp lead wire that electrically connects the lamp socket provided in the fixture main body and the output terminal of the discharge lamp lighting device. Therefore, there is a possibility that the radiation noise radiated from the lamp lead wire is increased and the noise performance is deteriorated.

  Therefore, apart from the lamp lead wire, the metal part of the fixture main body and the metal part of the case that houses the discharge lamp lighting device (the metal part and the conductive pattern of the circuit board of the discharge lamp lighting device are capacitively coupled) In some cases, the noise performance has been improved by electrically connecting between the two via a connecting wire different from the lamp lead wire, but in recent years, the demand for noise performance has increased. The improvement effect was insufficient.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a luminaire having further improved noise performance.

In order to achieve the above object, the present invention provides an apparatus body having a lamp socket for mounting a discharge lamp, and a discharge lamp lighting for lighting the discharge lamp inside a metal case formed separately from the apparatus body. The lighting device block that houses the device, the multiple lamp lead wires that electrically connect the output terminal of the discharge lamp lighting device and the lamp socket, and the metal part of the fixture body and the metal case, respectively. A first connecting wire and a second connecting wire that are connected to each other, and when the cable length of the lamp lead wire and the first and second connecting wires is 40 cm, the capacitance between the lamp lead wire and the lamp lead wire is 8 pF or more. a first connecting wire, the lamp lead wire and the first and interline capacitance between the lamp lead wires when the cable length of the second connecting wire of 40cm of the instrument body through the second connection wire becomes less 4pF Wherein the between the metal part and the metal case are electrically connected.

  According to the present invention, between the metal part of the instrument body and the metal case, the first connecting wire having a line capacity with the lamp lead wire of 8 pF or more (when the cable length is 40 cm), the lamp lead wire, Since the line-to-line capacitance is electrically connected via a second connecting wire that is 4 pF or less (when the cable length is 40 cm), the discharge lamp is lit compared to the case where only the second connecting wire is connected. Noise superimposed on the input power line from the device can be reduced, and noise performance can be improved.

  Here, it is preferable that the cross-sectional area of the conductor of the second connecting wire is larger than the cross-sectional area of the conductor of the first connecting wire, or the number of the second connecting wires is larger than the number of the first connecting wires. The noise performance is further improved.

In addition, the line capacitance between the lamp lead wire having the lowest ground voltage and the other lamp lead wires among the plurality of lamp lead wires may be 8 pF or more when the cable length of the lamp lead wire is 40 cm. Preferably, the noise performance is further improved.

  Moreover, it is also preferable to cover the periphery of the plurality of lamp lead wires and the first connection line with a jacket formed of an insulating material or a jacket formed of a conductive material.

  It is also preferable that the discharge lamp lighting device includes a boost chopper circuit that boosts a DC voltage to a desired voltage value, and an inverter circuit that converts the output voltage of the boost chopper circuit into a high-frequency voltage and supplies the high-frequency voltage to the discharge lamp. Even if the input power supply voltage fluctuates slightly, the voltage output from the boost chopper circuit to the inverter circuit hardly changes, and the power factor can be improved.

  It is also preferable that the step-up chopper circuit includes a switching element that switches the input voltage, and a snubber circuit in which a parallel circuit of a diode and a resistor and a capacitor are connected in series is provided between the output terminals of the switching element. Although the noise level is increased by providing the boost chopper circuit, switching noise can be reduced and noise performance can be improved by providing a snubber circuit.

  According to the present invention, between the metal part of the instrument main body and the metal case, the first connecting wire having a line capacity with the lamp lead wire of 8 pF or more (when the cable length is 40 cm), the lamp lead wire, Since the line-to-line capacitance is electrically connected via a second connecting wire that is 4 pF or less (when the cable length is 40 cm), the discharge lamp is lit compared to the case where only the second connecting wire is connected. The noise superimposed on the input power line from the apparatus can be reduced, and the noise performance is improved.

  Embodiments of the present invention will be described below with reference to FIGS. The lighting fixture 1 of this embodiment is provided with the fixture main body 2, the lighting device block 3, the several lamp lead wire 4, the 1st connection line 51, and the 2nd connection line 52 as main structures.

  The appliance body 2 is formed in a substantially L-shaped shape when viewed from the side by bending a metal plate and a pair of lamp sockets 21 for mounting the caps 101 of the discharge lamps La1 and La2 such as single-piece fluorescent lamps. Then, the socket mounting plate 22 in which the pair of lamp sockets 21 are mounted on the horizontal piece 22a in the width direction, and the dome-shaped reflecting plate 23 that reflects light irradiated upward from the discharge lamps La1 and La2 downward. With. Arms 24, 24 extend downward from the left and right side edges of the tip of the upper piece 22 b of the socket mounting plate 22, and the tips of both arms 24, 24 are connected to the ring portion 25. In the space surrounded by the piece 22b, the arms 24, 24, and the ring portion 25, the reflecting plate 23 is attached with the opening facing downward. At this time, the bulbs 100 of the discharge lamps La1 and La2 attached to the lamp socket 21 protrude into the reflecting plate 23 through holes (not shown) formed in the peripheral surface of the reflecting plate 23.

  The lighting device block 3 includes a metal case 30 having a substantially rectangular parallelepiped shape and provided with L-shaped leg pieces 31 and 31 on both side surfaces opposed in the longitudinal direction. A discharge lamp is provided inside the metal case 30. A discharge lamp lighting device 32 for stably lighting La1 and La2 is housed. The discharge lamp lighting device 32 includes a circuit board 34 made of a printed wiring board on which circuit components 33 constituting a lighting circuit to be described later are mounted. The terminal device 35 mounted on the circuit board 34 has a lamp lead wire 4 connected thereto. One end is connected. That is, the output terminal of the discharge lamp lighting device 32 and the lamp socket 21 are electrically connected via a plurality of lamp lead wires 4, and the high frequency voltage output from the discharge lamp lighting device 32 is the lamp. It is supplied to the discharge lamps La1 and La2 through the lead wire 4 and the lamp socket 21, and the discharge lamps La1 and La2 are turned on.

  Here, each lamp socket 21 is provided with four contactors respectively connected to four base pins (not shown) provided on the base 101 of the discharge lamp La1. 4 lamp lead wires 4 are required for each lamp socket 21. Therefore, when n discharge lamps La1 and La2 are connected to the fixture body 2, 4 × n (pieces) lamp lead wires 4 are required. become. Therefore, when the fixture main body 2 and the lighting device block 3 are placed separately as in this embodiment, a plurality of lamp lead wires 4 are bundled and used for each of the discharge lamps La1 and La2. It is preferable that the outer periphery of the four lamp lead wires 4 is covered with an outer covering (outer coating) 6. As the exterior covering 6, a so-called spiral tube formed in a spiral shape with an insulating synthetic resin is used, and a spiral tube is wound around the four lamp lead wires 4, so that four lamp lead wires 4 are provided. Bundled. Instead of the exterior covering 6 formed of an insulating material, an exterior covering 6 formed of a conductive material may be used. For example, as the exterior covering 6, a braid formed by knitting a metal wire into a net shape and forming a cylindrical shape. The lamp lead wires 4 may be bundled four by four by using a wire (not shown) and passing the four lamp lead wires 4 through the braided wire.

  Next, the circuit configuration of the discharge lamp lighting device 32 will be described with reference to FIG. The discharge lamp lighting device 32 includes a filter circuit 61, a rectifier circuit 62, a boost chopper circuit 63, an inverter circuit 64, and a chopper control circuit 65 as main components.

  The AC voltage of the commercial power supply AC is first input to the rectifier circuit 62 via the filter circuit 61, and full-wave rectified by the rectifier circuit 62 and converted into a DC voltage.

  The step-up chopper circuit 63 has a choke T1, a switching element Q1 composed of a MOSFET, and a resistor R10 connected in series between output terminals of the rectifier circuit 62, and a diode D10 between both ends of the series circuit composed of the switching element Q1 and the resistor R10. And a capacitor C10 connected in series. On / off of the switching element Q1 is controlled by the chopper control circuit 65. The chopper control circuit 65 is fed back with the output voltage of the boost chopper circuit 63 (the voltage across the capacitor C10) and determines the ON time of switching of the switching element Q1 while comparing with the input voltage after rectification. It operates to improve the power factor by bringing the waveform closer to the input voltage waveform. By providing such a step-up chopper circuit 63, the output voltage (the voltage across the capacitor C10) hardly changes even when the commercial power supply AC of the input voltage slightly fluctuates, and the power factor is improved as described above. It becomes possible. The chopper control circuit 65 may be a general-purpose IC made for controlling the step-up chopper, for example, a power factor improving IC (model number IC33262) manufactured by ON Semiconductor may be used.

  The inverter circuit 64 is supplied with the output voltage of the step-up chopper circuit 63 (the voltage across the capacitor C10), and is converted into a high-frequency AC voltage by switching the output voltage of the step-up chopper circuit 63 with a switching element (not shown). Supply to lamps La1 and La2.

  As described above, since the discharge lamp lighting device 32 includes the inverter circuit 64 that operates at a high frequency, noise is applied to the input power supply line that supplies power to the discharge lamp lighting device 32 due to the influence of the high-frequency output generated by the inverter circuit 64. May be superimposed. Therefore, in the present embodiment, the metal portion (for example, the socket mounting plate 22) of the instrument body 2 and the metal case 30 are electrically connected via the first connection wire 51 and the second connection wire 52. The noise superimposed on the input power line is reduced to improve the noise performance.

  A first connecting wire (hereinafter abbreviated as connecting wire) 51 is bundled together with four lamp lead wires 4, and the outer periphery of the connecting wire 51 and the lamp lead wire 4 is covered with an outer sheath 6. One end of the connecting wire 51 is screwed to the portion near the lamp socket 21 within the mounting surface (the surface on the reflecting plate 23 side) of the lamp socket 21 in the horizontal piece 22a with the screw 11, and the other end of the connecting wire 51 is connected. Is introduced into the inside of the metal case 30 and screwed to the inner surface of the metal case 30 using a fixing screw 11 for the discharge lamp lighting device 32 provided in the vicinity of the terminal device 35.

  In addition to the connection wires 51, two second connection wires (hereinafter abbreviated as connection wires) 52 that are not covered with the outer sheath 6 together with the lamp lead wires 4 are provided. One end is screwed to the surface of the horizontal piece 22 a opposite to the mounting surface of the lamp socket 21 using the screw 11, and the other end of each connection wire 52 is screwed to the outer surface of the metal case 30 using the screw 11. Has been.

  As described above, as a result of measuring the noise performance by electrically connecting the metal part (socket mounting plate 22) of the instrument body 2 and the metal case 30 using the two types of connection wires 51 and 52, the input It was confirmed that the noise level superimposed on the power line was reduced and the noise performance was greatly improved.

  Here, when both ends of the connecting wire 51 are screwed to the instrument body 2 and the metal case 30 using the screws 11, respectively, the instrument body 2 (the socket mounting plate 22 and the reflecting plate 23) is formed of metal, so that the connection This also affects the line capacity between the other four lamp lead wires 4 bundled with the outer sheath 6 different from the electric wire 51 and the connecting electric wire 51. Using the LCR meter (model number hp4284A) manufactured by Yokogawa Hewlett-Packard Co., the line capacity between the other four lamp lead wires 4 and the connecting wire 51 was measured under the measurement conditions of Cp mode and measurement frequency 2.5 kHz. When measured, the capacitance between the lines was about 8-11 pF. Since the line capacity between the lamp lead wire 4 bundled in the same outer sheath 6 as the connection electric wire 51 is expected to be larger than this value, the line capacity between the connection electric wire 51 and the lamp lead wire 4 is It is 8 pF or more when the cable length is 40 cm. Moreover, when the measurement was performed under the same conditions using the same measuring instrument as described above, the line capacity between the connecting wire 52 and the lamp lead wire 4 was about 2 to 4 pF when the cable length was 40 cm.

  The result of having measured noise performance about the lighting fixture of this embodiment and a comparative example below is demonstrated based on FIGS.

  5A and 5B show measurement results when the number of connection wires 51 covered with the lamp lead wires 4 in the outer sheath 6 is zero, and the lamp lead wires 4 are included in the outer sheath 6. In addition, FIG. 5A shows the measurement results when the number of connection wires 52 not covered is one, and FIG. 5B shows the measurement results when there are two connection wires 52. From this measurement result, when the number of connection wires 51 covered with the lamp lead wire 4 is zero, the peak value of the noise level is increased even if the number of connection wires 52 not covered with the lamp lead wire 4 is increased. Is hardly changed, and it can be seen that there is almost no effect of reducing the peak value.

  6A and 6B show the measurement results when the number of connection wires 52 not covered with the lamp lead wire 4 in the outer sheath 6 is zero, and the lamp lead wire is not included in the outer sheath 6. FIG. 6A shows the measurement results when the number of connection wires 51 covered with 4 is one, and FIG. 6B shows the measurement results when the number of connection wires 51 is two. From this measurement result, when the number of connection wires 52 not covered with the lamp lead wire 4 is zero, even if the number of connection wires 51 covered with the lamp lead wire 4 is increased, the peak value of the noise level is almost zero. It can be seen that there is almost no effect of reducing the peak value without changing.

  On the other hand, FIGS. 7A and 7B show the measurement results when the number of the connecting electric wires 51 covered with the lamp lead wire 4 in the outer sheath 6 is one, FIG. 7 (a) shows the measurement results when the number of the connecting electric wires 52 covered with the lamp lead wires 4 is one, and FIG. 7 (b) shows the measurement results when the number of the connection wires 52 is two. From this measurement result, when both the connection wires 51 and 52 are connected, if the number of the connection wires 52 is increased to two, the peak value of the noise level is remarkably lowered and the noise performance is greatly improved. There was found. That is, it is also preferable that the number of the second connection wires 52 is larger than the number of the first connection wires 51, and the cross-sectional area of the conductors of the second connection wires 52 is greater than the cross-sectional area of the conductors of the first connection wires 51. May be larger.

  8A and 8B show the measurement results when the number of the connecting electric wires 52 not covered with the lamp lead wire 4 in the outer sheath 6 is two. Among the two, the high voltage side is taken out of the outer sheath 6 and only the two low voltage sides are covered with the outer sheath 6 together with the connecting wire 51. FIG. FIG. 89B shows the measurement results when the book is put out of the outer sheath 6 and only the two high voltage side wires are covered with the outer sheath 6 together with the connection wires 51. From this measurement result, the peak value of the noise level is reduced when the lamp lead wire 4 and the connection electric wire 52 on the low voltage side are bundled and the lamp lead wire 4 and the connection electric wire 52 are covered with the outer sheath 6. It turned out to be highly effective. In addition, it is also preferable that the line capacitance between the lamp lead wire 4 having the lowest voltage to ground and the other lamp lead wires 4 is 8 pF or more, and noise performance can be further improved.

  9A shows a measurement result when the discharge lamp lighting device 32 does not include the boost chopper circuit 63, and FIG. 9B shows a measurement result when the discharge lamp lighting device 32 includes the boost chopper circuit 63. FIG. From this measurement result, it was found that when the boost chopper circuit 63 is provided, the peak value of the noise level becomes larger and the noise performance is lowered. However, the provision of the boost chopper circuit 63 provides the advantages that the output voltage can be made substantially constant even if the commercial power supply AC changes somewhat, and the power factor is improved. In order to suppress the peak value of the noise level, a snubber circuit is preferably provided. 4 shows a circuit in which the snubber circuit 66 is provided in parallel with the switching element Q1 in the step-up chopper circuit 63 of FIG. 3 described above, and the circuit configuration other than the snubber circuit 66 is the same as the circuit of FIG. The description is omitted.

  The snubber circuit 66 includes a diode D1 whose anode is connected to the drain of the switching element Q1, a resistor R1 connected in parallel with the diode D1, and a capacitor connected between the cathode of the diode D1 and the source of the switching element Q1. The snubber circuit 66 can reduce switching noise and further improve noise performance.

It is a side view of the lighting fixture of this embodiment. (A) is the figure which looked at the instrument main body of the state which removed the reflecting plate and the discharge lamp from the A direction in FIG. 1, (b) is sectional drawing which can abbreviate | omit a part of lighting device block. It is a block circuit diagram of a discharge lamp lighting device same as the above. It is a block circuit diagram of the other discharge lamp lighting device same as the above. (A) (b) is a figure which shows the measurement result of noise performance. (A) (b) is a figure which shows the measurement result of noise performance. (A) (b) is a figure which shows the measurement result of noise performance. (A) (b) is a figure which shows the measurement result of noise performance. (A) (b) is a figure which shows the measurement result of noise performance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Appliance main body 21 Lamp socket 22 Socket mounting plate 23 Reflector 3 Lighting device block 30 Metal case 32 Discharge lamp lighting device 4 Lamp lead wire 51 1st connecting wire 52 2nd connecting wire La1, La2 Discharge lamp

Claims (8)

An instrument body having a lamp socket for mounting a discharge lamp;
A lighting device block containing a discharge lamp lighting device for lighting the discharge lamp inside a metal case formed separately from the appliance body;
A plurality of lamp lead wires that electrically connect between the output terminal of the discharge lamp lighting device and the lamp socket ;
A first connecting wire and a second connecting wire that electrically connect between the metal part of the instrument body and the metal case, respectively,
When the cable length of the lamp lead wire and the first and second connection wires is 40 cm, the first connection wire having an interline capacitance of 8 pF or more with the lamp lead wire, and the lamp lead wire and the first and second connection wires When the cable length is 40 cm, the metal part of the instrument body and the metal case are electrically connected via the second connection wire having a line-to-lamp capacitance of 4 pF or less. Characteristic lighting equipment.   The lighting fixture according to claim 1, wherein a cross-sectional area of the conductor of the second connection electric wire is larger than a cross-sectional area of the conductor of the first connection electric wire.   The lighting fixture according to claim 1, wherein the number of the second connection wires is larger than the number of the first connection wires. Among the plurality of lamp lead wires, the capacitance between the lamp lead wire having the lowest ground voltage and other lamp lead wires is set to 8 pF or more when the cable length of the lamp lead wire is 40 cm. The lighting fixture according to any one of claims 1 to 3.   5. The lighting apparatus according to claim 1, wherein the plurality of lamp lead wires and the first connection line are covered with an outer jacket formed of an insulating material.   The lighting fixture according to any one of claims 1 to 4, wherein the plurality of lamp lead wires and the first connection line are covered with a jacket made of a conductive material.   The discharge lamp lighting device includes a boost chopper circuit that boosts a DC voltage to a desired voltage value, and an inverter circuit that converts an output voltage of the boost chopper circuit into a high-frequency voltage and supplies the high-frequency voltage to the discharge lamp. The lighting fixture according to any one of claims 1 to 6.   The step-up chopper circuit includes a switching element that switches an input voltage, and a snubber circuit in which a parallel circuit of a diode and a resistor and a capacitor are connected in series is provided between output terminals of the switching element. The lighting fixture according to claim 7.

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