JP2007317678A - Discharge lamp lighting device, luminaire including it, and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noise caused by stray capacitance even when grounding capacitors are mounted to a substrate by lead-free flow soldering. <P>SOLUTION: This luminaire includes a lamp 1 and a discharge lamp lighting device 2. In the discharge lamp lighting device 2, a plurality of components including a grounding part 25 are fixed onto a substrate by lead-free flow soldering, a power supply E is connected to its input side, and the lamp 1 is connected to its output side. The length of the lamp (length of a glass tube) is not smaller than 1,200 mm. The grounding part 25 is composed of grounding capacitors 26, 26, and is provided to be grounded to the earth. The grounding capacitor 26 is a film capacitor, and excellent in heat resistance. The discharge lamp lighting device 2 converts power from the power supply E to high frequency power through an inverter 23 and outputs it to the lamp 1 to control lighting of the lamp 1. Then, the grounding part 25 reduces high frequency noise generated from the inverter 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device for controlling lighting of a discharge lamp, a lighting fixture including the same, and a lighting system, for example.

  Conventionally, various discharge lamp lighting devices of this type have been proposed and marketed in order to prevent noise or malfunction due to stray capacitance generated between the fixture body or the lamp (discharge lamp). For example, Patent Documents 1 to 3 disclose a discharge lamp lighting device that reduces noise or malfunction by providing a grounding capacitor between the fixture main body.

  In FIG. 11, the leakage current of the discharge lamp lighting device (inverter ballast) 4 is indicated by an arrow. The discharge lamp lighting device 4 includes a filter LF, a rectifier circuit 40, an inverter 41, and a resonance circuit 42. The inverter 41 includes, for example, switching elements Q2 and Q3 having a half bridge configuration. The resonance circuit 42 includes, for example, a coil (inductor) L3 and capacitors C6 and C7. In the discharge lamp lighting device 4, when the lamp 1 is lit, leakage current is generated through the stray capacitances Ce 1 and Ce 2 of the lamp wires 10 and 10 and the stray capacitance Ce 3 between the lamp 1 and the fixture reflector 43. . The stray capacitances Ce1, Ce2, and Ce3 increase as the glass tube of the lamp 1 increases in length, thereby increasing the leakage current.

  Since the leakage current is fed back to the inverter 41 via the power supply E, a grounding capacitor 44 having a larger capacity than the stray capacitances Ce1, Ce2, Ce3 is provided to be grounded in order to reduce the leakage current. As a result, the leakage current flowing through the ground capacitor 44 is fed back to the power supply via the ground, so that the leakage current including inverter noise due to the stray capacitances Ce1, Ce2, and Ce3 is reduced, and noise is reduced. A ceramic capacitor (disk ceramic capacitor) is generally used as the grounding capacitor 44.

In recent years, lead-free, which does not contain lead (Pb), has been promoted in order to reduce the burden on the global environment. As a result, many high melting point materials have been used as solder components.
Japanese Patent No. 3304596 JP-A-9-28979 Japanese Patent Laid-Open No. 2001-1601

  However, in the above conventional discharge lamp lighting device, since the grounding capacitor is a ceramic capacitor, the temperature characteristics are poor, and the capacitance of the grounding capacitor decreases due to an increase in ambient temperature or self-heating. When the capacitance of the grounding capacitor is reduced, there is a problem that the leakage current flowing through the stray capacitance increases and noise increases. In particular, when a grounding capacitor is mounted on a substrate with lead-free flow solder, the preheating temperature and the solder dip temperature are increased, so that it is easily affected by the heat, and the above problem becomes conspicuous.

  The present invention has been made in view of the above points, and an object of the present invention is to reduce noise caused by stray capacitance even when a grounding capacitor is mounted on a substrate with lead-free flow solder. Disclosed is a discharge lamp lighting device, and a lighting fixture and a lighting system including the same.

  The invention according to claim 1 is a discharge lamp lighting device for controlling lighting of a discharge lamp by mounting a plurality of parts including a grounded capacitor provided on the ground with a lead-free flow solder, wherein the discharge lamp The glass tube has a length of 1200 mm or more, and the grounding capacitor is a film capacitor.

  In this configuration, even when the grounding capacitor is mounted on the board with lead-free flow solder, the decrease in the capacitance of the grounding capacitor is suppressed when the ambient temperature rises, self-heating, or the stray capacitance of the discharge lamp increases. Therefore, noise due to stray capacitance can be reduced.

  The invention according to claim 2 is the invention according to claim 1, wherein the grounding capacitor is a PET film capacitor. In this configuration, since the heat resistance of the grounding capacitor can be improved, the solder temperature can be further increased.

  The invention according to claim 3 is the invention according to claim 1, wherein the grounding capacitor is a high heat-resistant PP film capacitor. In this configuration, since the heat resistance of the grounding capacitor can be improved, the solder temperature can be further increased.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the grounding capacitor includes a film having a thickness of 19 μm or more. This configuration can withstand even if a lightning surge voltage is applied.

  The invention according to claim 5 is the invention according to claim 1 or 2, characterized in that the electrode of the ground capacitor is made of an aluminum foil of 5 μm or more. With this configuration, it is possible to prevent scattering of the deposited film due to high voltage or corona discharge, and improve workability.

  The invention described in claim 6 is characterized in that the lighting fixture incorporates the discharge lamp lighting device according to any one of claims 1 to 5. In this configuration, even when the grounding capacitor is mounted on the board with lead-free flow solder, the decrease in the capacitance of the grounding capacitor is suppressed when the ambient temperature rises, self-heating, or the stray capacitance of the discharge lamp increases. Therefore, noise due to stray capacitance can be reduced.

  According to a seventh aspect of the present invention, an illumination system includes the discharge lamp lighting device according to any one of the first to fifth aspects. In this configuration, even when the grounding capacitor is mounted on the board with lead-free flow solder, the decrease in the capacitance of the grounding capacitor is suppressed when the ambient temperature rises, self-heating, or the stray capacitance of the discharge lamp increases. Therefore, noise due to stray capacitance can be reduced.

  According to the present invention, even when a grounding capacitor is mounted on a substrate with lead-free flow solder, noise due to stray capacitance can be reduced.

(Embodiment 1)
First, the basic configuration of the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the lighting fixture of Embodiment 1 controls lighting of a lamp (discharge lamp) 1 by a discharge lamp lighting device 2, and includes a lamp 1 in a fixture body (not shown). The discharge lamp lighting device 2 is built in and provided. The instrument body (not shown) includes an instrument reflector (not shown) at the place where the lamp 1 is installed.

  The lamp 1 is provided with electrodes on both ends of a glass tube, and is discharged by high-frequency power from the discharge lamp lighting device 2 to be lit.

  The discharge lamp lighting device 2 has a plurality of components mounted on a substrate with lead-free flow solder, and includes a filter unit 20, a rectifying unit 21, a chopper 22, an inverter 23, a resonance circuit 24, and a grounding unit 25. Further, the discharge lamp lighting device 2 is connected to the power source E on the input side and is connected to the lamp 1 on the output side to control lighting of the lamp 1. The power source E is a commercial power source, for example, and supplies AC power to the discharge lamp lighting device 2.

  The filter unit 20 includes a capacitor C <b> 1 and a filter LF in this order from the power source E side, receives AC power from the power source E, and outputs the AC power to the rectifying unit 21. Capacitor C1 is connected to both ends of power supply E to reduce normal mode noise. The filters LF are connected to the power supply E line, respectively, to reduce common mode noise. The filter unit 20 reduces noise generated in the inverter 23 and suppresses harmonics from flowing to the power source E side.

  The rectification unit 21 includes a rectification circuit 210 and a capacitor C2 in this order from the filter unit 20 side. The rectifier circuit 210 is, for example, a diode bridge composed of four diodes, and is a single-phase full-wave rectifier circuit that full-wave rectifies the AC power input from the filter unit 20. The capacitor C2 converts the full-wave rectified power into smooth DC power. The rectifying unit 21 outputs the DC power to the chopper 22. Note that the rectifier circuit 210 is not limited to a single-phase full-wave rectifier circuit, and may be a single-phase half-wave rectifier circuit or the like. Further, when the power source E is three-phase, a three-phase full-wave rectifier circuit, a three-phase half-wave rectifier circuit, or the like may be used.

  The chopper 22 is a step-up chopper that includes a coil (inductor) L1, a switching element Q1, a diode D, and an electrolytic capacitor C3 in this order from the rectifying unit 21 side. The switching element Q1 is, for example, a field effect transistor (FET) or the like, and performs an on / off operation based on a control signal from a control unit (not shown). The electrolytic capacitor C3 has a large capacity. The chopper 22 is not limited to the step-up chopper, and may be a step-down chopper, a step-up / step-down chopper, a polarity reversal chopper, or the like.

  The chopper 22 receives DC power from the rectifier 21 and converts the DC power into DC power suitable for the inverter 23. Specifically, first, when the switching element Q1 is turned on, the DC power from the rectifying unit 21 becomes a path of the coil L1 and the switching element Q1. At this time, electromagnetic energy is stored in the coil L1. Next, when the switching element Q1 is turned off, a counter electromotive force is generated in the coil L1, and the counter electromotive force is added to the DC power from the rectifying unit 21 to output a DC power larger than the DC power from the rectifying unit 21. . From the above, the DC power from the rectifying unit 21 is pulsed power. The pulse power becomes smooth DC power by the electrolytic capacitor C3. The chopper 22 outputs the smooth DC power to the inverter 23.

  The inverter 23 is a half-bridge circuit composed of a series circuit of two switching elements Q2, Q3, for example. The switching elements Q2 and Q3 are, for example, field effect transistors or the like, and perform on and off operations based on a control signal from a control unit (not shown). The inverter 23 receives DC power from the chopper 22 and converts the DC power into high-frequency power based on switching on and off by the switching elements Q2 and Q3. The high frequency power is output to the resonance circuit 24. The frequency at which the switching elements Q2, Q3 are switched on and off is referred to as a switching frequency, and the frequency of the high-frequency power depends on the switching frequency.

  The resonance circuit 24 includes, for example, a coil (inductor) L2 and capacitors C4 and C5, and has a specific resonance frequency. The resonance circuit 24 receives high frequency power from the inverter 23 and converts the magnitude of the high frequency power based on the frequency of the high frequency power. Specifically, when the frequency of the high frequency power increases and approaches the resonance frequency, the high frequency power increases. On the other hand, when the frequency of the high frequency power becomes far from the resonance frequency, the high frequency power becomes small. The high frequency power whose size has been converted as described above is output to the lamp 1.

  The grounding unit 25 includes, for example, two grounding capacitors 26 and 26, and is provided with one end connected to the output side of the rectifier circuit 210 and the other end grounded.

  The grounding capacitor 26 is a film capacitor having an appearance as shown in FIG. 2A. As shown in FIG. 2B, the pair of films 260 and 260, the pair of electrodes 261 and 261, and the pair of lead wires 262. , 262. The pair of films 260 and 260 is a dielectric such as polypropylene (PP), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), and is wound. The pair of films 260 and 260 are formed by laminating aluminum foils 264 and 264 by, for example, vapor deposition while providing margins 263 and 263 alternately. FIG. 2 (c) shows a cross section. The steady applied voltage of each film 260 is generally 100 V / μm, and the instantaneous high voltage is 130 V / μm, which is 1.3 times the steady applied voltage. Here, if the lightning surge voltage is 2.5 kV, the required thickness of the film 260 is (2500 V) / (130 V / μm) ≈19 μm. From the above, in the first embodiment, the thickness of each film 260 is set to 19 μm or more.

  As shown in FIG. 2B, the electrode 261 is, for example, a metallized film, an aluminum foil, or the like, and is joined to the end of the wound film 260. At this time, the electrode 261 is electrically connected to the aluminum foil 264. The metallized film is obtained by evaporating an aluminum (Al) alloy or the like on a film. On the other hand, aluminum foil does not scatter even if high voltage or corona discharge occurs. When aluminum foil is used, the thickness of the electrode 261 is 5 μm or more in order to improve workability. If the thickness is 6 μm or more, workability is further improved. The lead terminal 262 has one end connected to the electrode 261 and the other end fixed to a substrate (not shown) with lead-free solder.

Even if the grounding part 25 (see FIG. 1) applies the lightning surge waveform as shown in FIG. 3 2000 times at intervals of 15 seconds (see FIG. 4 (a)), it is shown in FIGS. 4 (b) to 4 (d). As described above, there is no change in capacitance, dielectric loss tangent, and insulation resistance before (after the test) and after (after the test) application of the lightning surge. Further, FIG. 5A shows the withstand voltage before leaving in a high temperature environment, and FIG. 5B shows the withstand voltage after standing. Before and after standing in a high temperature environment, the withstand voltage is 4.0 kV _0-p or more, and thus it can be said that the lightning surge performance is sufficiently ensured. The withstand voltage was measured with a rare short tester. Further, when the grounding portion 25 is mounted on a substrate (not shown) with lead-free flow solder, preheating at 120 ° C. for 90 seconds is performed, and then solder dipping at 260 ° C. for 6 seconds is performed in a lead-free solder bath. It was confirmed that the characteristics of the grounding portion 25 were not impaired.

  Next, operation | movement of the lighting fixture of Embodiment 1 is demonstrated using FIG. In the discharge lamp lighting device 2, the rectification unit 21 rectifies the AC power input from the power source E through the filter unit 20 into DC power, and outputs the DC power to the chopper 22. The chopper 22 converts the magnitude of the DC power and outputs the converted DC power to the inverter 23. The inverter 23 converts the converted direct-current power into high-frequency power and outputs the high-frequency power to the resonance circuit 24. The resonance circuit 24 converts the magnitude of the high frequency power based on the frequency of the high frequency power, and outputs the converted high frequency power to the lamp 1. The lamp 1 is turned on and off based on the high frequency power from the resonance circuit 24.

  As described above, according to the first embodiment, even when the ground capacitors 26 and 26 are mounted on a substrate (not shown) with lead-free flow solder, the ambient temperature can be increased by using the film capacitors for the ground capacitors 26 and 26. When the rise, self-heating, or increase in the stray capacitance of the lamp 1 occurs, the decrease in the capacitance of the ground capacitors 26 and 26 can be suppressed, so that noise due to stray capacitance can be reduced. Moreover, even if a lightning surge voltage is applied, it can endure. Furthermore, scattering of the deposited film due to high voltage or corona discharge can be prevented, and workability can be improved.

(Embodiment 2)
The lighting fixture of Embodiment 2 includes the discharge lamp lighting device 2 (see FIGS. 1 and 6) similarly to the lighting fixture of Embodiment 1, and the discharge lamp lighting device 2 of Embodiment 2 includes a filter unit 20 and a rectification unit 21. The chopper 22 (both see FIG. 6), the inverter 23, and the resonance circuit 24 (both see FIG. 1) are provided in the same manner as the discharge lamp lighting device 2 (see FIG. 1) of the first embodiment. There are features described below that are not present in the appliance and discharge lamp lighting device 2.

  As shown in FIG. 6, the discharge lamp lighting device 2 of Embodiment 2 has one end of the grounding part 25 connected between the filter LF and the rectifier circuit 210. In addition, the lamp 1 (see FIG. 1) of the second embodiment has a lamp length (the length of the glass tube) of 1200 mm or more, such as an 86-type lamp (FHF86, lamp length 2367 mm). The lamp 1 and the grounding unit 25 of the second embodiment are the same as the lamp 1 and the grounding unit 25 of the first embodiment (see FIG. 1 for both), except for the points described above. 6 is obtained by replacing the input side (left side in FIG. 1) with respect to A1 and A2 in FIG. 1, and A1 and A2 in FIG. 6 are connected to A1 and A2 in FIG. 1, respectively.

  FIG. 7 shows the stray capacitance CL between the 86-type lamp and the instrument body. As a comparative example, the stray capacitance between the 32-type lamp (FHF32, lamp length 1198 mm) and the instrument body is also shown. Since the 86-type lamp has a lamp length that is about twice that of the 32-type lamp, the stray capacitance CL between the fixture body and the stray capacitance CL between the 32-type lamp and the fixture body is doubled. More than that. The stray capacitance CL is stray capacitance Ce1, Ce2, Ce3 (see FIG. 11), and CL≈Ce1 + Ce2 + Ce3. FIG. 8 shows the temperature characteristics of the combined capacitance when the grounding capacitors 26 and 26 (see FIG. 6) are connected in series. The capacitance of each grounding capacitor 26 is 4700 pF. For comparison, the case where the grounding capacitor is a ceramic capacitor is also shown. When the ground capacitors 26 and 26 are film capacitors, the capacitance of the ground capacitors 26 and 26 does not change even if the temperature of the ground capacitors 26 and 26 changes.

  On the other hand, when the ground capacitor is a ceramic capacitor, the capacitance of the ground capacitor decreases as the temperature of the ground capacitor rises, and may be the same as or smaller than the stray capacitance CL. In the above case, the leakage current through the stray capacitance increases, and this causes the leakage current to be fed back to the power supply through the ground, leading to an increase in terminal noise.

  From the above, if the ground capacitors 26 and 26 (see FIG. 6) are film capacitors, even if the temperature of the ground capacitors 26 and 26 changes, the capacitance of the ground capacitors 26 and 26 is greater than the stray capacitance CL of the instrument body 3a. Since it is kept large and constant, an increase in noise due to a temperature change can be prevented.

  As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained, and the lamp length of the lamp 1 (see FIG. 1) becomes longer and the stray capacitance becomes larger. Even in such a case, stray capacitance can be greatly reduced.

  As a modification of the second embodiment, even in the case of a lamp having a short lamp length (for example, FHF32), the structure is long, or compared with the instrument main body 3a as shown in FIG. As shown in FIG. 9B, even if the stray capacitance is increased by the structure of the cylindrical pipe-shaped instrument body 3b, the same effect as in the second embodiment can be obtained.

(Embodiment 3)
The lighting fixture of Embodiment 3 includes a lamp 1 (see FIG. 1) and a discharge lamp lighting device 2 (see FIGS. 1 and 10) in the same manner as the lighting fixture of Embodiment 1, and the discharge lamp lighting device 2 of Embodiment 3 includes The filter unit 20, the rectifying unit 21, the chopper 22 (both refer to FIG. 10), the inverter 23, and the resonance circuit 24 (both refer to FIG. 1) are provided in the same manner as the discharge lamp lighting device 2 of Embodiment 1 (refer to FIG. 1). However, the discharge lamp lighting device 2 according to the first embodiment has the following characteristic portions that are not included in the discharge lamp lighting device 2.

  As shown in FIG. 10, the discharge lamp lighting device 2 according to the third embodiment includes a grounding unit 25 that is a grounding capacitor that is a PET (polyethylene terephthalate) film capacitor, and is connected between the capacitor C1 and the filter LF. Is provided with grounding. In addition, the grounding part 25 of Embodiment 3 is the same as that of the grounding part 25 (refer FIG. 1) of Embodiment 1 in points other than the above. 10 is obtained by replacing the input side (left side in FIG. 1) with respect to A1 and A2 in FIG. 1, and A1 and A2 in FIG. 10 are connected to A1 and A2 in FIG. 1, respectively.

  As described above, according to the third embodiment, the same effects as those of the first embodiment can be obtained, and the heat resistance of the grounding capacitors 26 and 26 can be improved, so that the solder temperature can be further increased.

  As a modification of the third embodiment, the grounding portion 25 may be either one of a high heat resistant PP (polypropylene) film capacitor and a high heat resistant PPS (polyphenylene sulfide) film capacitor. Even if it does in this way, the effect similar to Embodiment 3 can be acquired. However, in terms of dielectric strength and cost, PET film capacitors and PP film capacitors are superior to PPS film capacitors.

  Further, as a modification of any one of the first to third embodiments, a lighting system may be provided that includes a lamp and a discharge lamp lighting device separately and electrically connects the lamp and the discharge lamp lighting device. . Even if it is such a structure, the effect similar to Embodiment 1-3 can be acquired.

  Furthermore, as another modified example of any one of the first to third embodiments, a steel wire having a lower thermal conductivity than a copper (Cu) wire is used as a lead wire, or the diameter is, for example, 0.6 mm or 0.8 mm. You may use the thing of thin. Thereby, the thermal influence on the grounding capacitor can be reduced, and as a result, a PP film can be used as the film of the grounding capacitor.

It is a circuit diagram of the lighting fixture of Embodiment 1 by this invention. It is a grounding capacitor same as the above, (a) is an external view, (b) is a developed view, and (c) is a sectional view. It is a wave form diagram of the lightning surge pulse applied to a discharge lamp lighting device same as the above. In the above discharge lamp lighting device, (a) is a diagram showing measurement conditions, (b) is a diagram showing capacitance, (c) is a diagram showing dielectric loss tangent, and (d) is a diagram showing insulation resistance. . The breakdown voltage normal probability distribution of the same discharge lamp lighting device, (a) is a distribution diagram before leaving at high temperature, (b) is a distribution diagram after leaving at high temperature. It is a circuit diagram of the lighting fixture of Embodiment 2 by this invention. It is a figure showing the stray capacity between a lamp length same as the above and a lamp | ramp, and an instrument main body. It is a figure showing the temperature characteristic about the capacity | capacitance of a grounding capacitor same as the above. It is another discharge lamp lighting device same as the above, (a) is a perspective view when an instrument main body is planar shape, (b) is a perspective view when an instrument main body is cylindrical pipe shape. It is a circuit diagram of the lighting fixture of Embodiment 3 by this invention. It is a circuit diagram of the conventional lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp 2 Discharge lamp lighting device 23 Inverter 25 Grounding part 26 Grounding capacitor E Power supply

Claims (7)

A discharge lamp lighting device for controlling a lighting of a discharge lamp by mounting a plurality of components including a grounded capacitor provided on the ground with a lead-free flow solder,
The length of the glass tube of the discharge lamp is 1200 mm or more,
The discharge lamp lighting device, wherein the grounding capacitor is a film capacitor.   The discharge lamp lighting device according to claim 1, wherein the grounding capacitor is a PET film capacitor.   The discharge lamp lighting device according to claim 1, wherein the grounding capacitor is a high heat-resistant PP film capacitor.   The discharge lamp lighting device according to claim 1, wherein the grounding capacitor includes a film having a thickness of 19 μm or more.   The discharge lamp lighting device according to claim 1 or 2, wherein the electrode of the grounding capacitor is made of an aluminum foil of 5 µm or more.   A lighting fixture comprising the discharge lamp lighting device according to any one of claims 1 to 5.   An illumination system comprising the discharge lamp lighting device according to claim 1.

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