JP3829946B2 - Discharge lamp lighting device and lighting device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a discharge lamp lighting device and an illumination device including an igniter that generates a high voltage for starting.
[0002]
[Prior art]
Conventionally, this kind of discharge lamp lighting device has been proposed in Japanese Patent Application Laid-Open No. 5-258874. As shown in FIG. 5, the high-pressure discharge lamp 52 is lit by the output of the inverter 51 and has an igniter 53 composed of a multiple voltage rectifying and smoothing circuit. The igniter 53 rectifies and smoothes the output of the inverter 51 by a multi-stage rectification and smoothing circuit, and applies a boosted DC voltage to the discharge lamp 52 to start the discharge lamp 52.
[0003]
After the discharge lamp 52 is lit, the voltage across the igniter 53 is reduced to the lamp voltage, so that no high voltage is generated.
[0004]
Since this conventional technique can obtain a DC voltage smoothed at a required voltage value, the discharge lamp 53 can be started reliably.
[0005]
[Problems to be solved by the invention]
In the above prior art, as described above, a boosted and smoothed DC voltage is generated, so that the DC voltage is continuously output until the discharge lamp is turned on. For this reason, when attaching the lighting fixture incorporating the conventional discharge lamp lighting device, it may be necessary to perform special grounding. That is, the electrical equipment standard stipulates that a lighting device having an effective value of output voltage (for 2 seconds or more) of 300 V or more and a lamp current of 1 A or more should be subjected to special type 3 grounding. For example, many high-pressure discharge lamps of 200 W or more used for general facility lighting have a lamp current of 1 A or more and a starting voltage of 1 KV or more is required. Therefore, the conventional type often requires the special type 3 grounding. The fact that such grounding is required makes the lighting fixtures more expensive and makes the installation work cumbersome. Furthermore, in addition to the grounding, there are also problems of electric shock due to continuous output of a high voltage and insulation deterioration of parts.
[0006]
Such a problem occurs not only when the discharge lamp is started, but also when there is no load, such as when the discharge lamp cannot be started for some reason, or when the discharge lamp is removed.
[0007]
The present invention has been made to solve such a problem, and it is possible to start the discharge lamp with certainty, eliminate the need for special grounding as much as possible, and at low cost without complicating the installation work. An object of the present invention is to provide a discharge lamp lighting device and a lighting device that can eliminate or reduce the problem of insulation deterioration of components.
[0008]
[Means for Solving the Problems]
The invention of claim 1 includes a power supply unit that outputs an alternating voltage, discharge stabilization means connected to the power supply part, a discharge lamp energized by the output of the power supply part via the discharge stabilization means, and a power supply part An igniter mainly composed of a multiple voltage rectifier circuit for multiple voltage rectification of the output, a discharge resistor connected in parallel to the smoothing capacitor in the final stage of the igniter, and at least when starting the discharge lamp And a control means for discontinuous voltage supply to the igniter.
[0009]
In the present invention, the power supply unit may be a power supply itself such as a commercial AC power supply, or may convert a DC voltage such as an inverter into an AC voltage.
[0010]
The discharge stabilization means may be any means that can stably light the discharge lamp, such as a leakage transformer, a choke coil, or a capacitor.
[0011]
Furthermore, as the discharge lamp, a high-intensity discharge lamp such as a metal halide lamp or a mercury lamp, a low-pressure mercury vapor discharge lamp such as a fluorescent lamp, or the like, which requires high pressure at the time of starting.
[0012]
Further, discontinuous voltage supply to the igniter at least at the start of the discharge lamp means that discontinuity is allowed even after the discharge lamp is turned on.
[0013]
Further, discontinuity includes both intermittent and irregular intermittent ones.
[0014]
The above is common to the same configurations in the following inventions.
[0020]
The invention of claim 2 comprises the discharge lamp lighting device of claim 1 , a lighting fixture body, and a discharge lamp disposed in the lighting fixture body and started and lit by the discharge lamp lighting device. Features.
[0021]
[Action]
According to the first aspect of the present invention, when a voltage is supplied from the power supply unit, the igniter rectifies and smoothes in multiple stages and applies the output to the discharge lamp. Further, the control means makes the voltage supply to the igniter discontinuous. Therefore, for example, even if the igniter is designed to output a voltage having a peak value number KV, its effective value becomes small. The voltage supply period to the igniter is set so that the output voltage has a peak value and a width that can start the discharge lamp and shift to lighting. When the discharge lamp is turned on, the lamp is steadily lit by the output from the power supply unit and through the discharge stabilizing means. After lighting, regardless of whether or not the voltage supply to the igniter is discontinuous, the voltage at both ends is reduced to the lamp voltage, so that no high voltage is generated.
[0027]
According to the second aspect of the present invention, the lighting device operates in the same manner as the discharge lamp lighting device according to the first aspect .
[0028]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0029]
FIG. 1 is a circuit diagram showing a first embodiment of the present invention. Reference numeral 1 denotes a power supply unit that outputs an alternating voltage, 2 denotes discharge stabilization means, and 3 denotes a discharge lamp. For example, the power supply unit 1 is a commercial frequency AC power supply, and the discharge stabilization means 2 is mainly a leakage transformer. Reference numeral 4 denotes an igniter mainly composed of a multiple voltage rectifier circuit having diodes 5 to 8 and capacitors 9 to 12. A discharge resistor 13 is connected in parallel to the capacitor 12 at the final stage of the igniter 4. Reference numeral 14 denotes control means for discontinuously supplying voltage to the igniter. In this embodiment, it comprises a switch 15 provided on the anode side of the diode 5 and an opening / closing control device 16 for opening and closing the switch 15 periodically.
[0030]
Next, the operation of this embodiment will be described. When an AC voltage is output from the power supply unit 1, the voltage is applied to the igniter 4 via the discharge stabilization means 2. Therefore, during the period when the switch 15 of the control means 14 is on, the igniter 4 is rectified and smoothed in multiple stages by the diodes 5 to 8 and the capacitors 9 to 12 to apply a high voltage to the discharge lamp 3. To do. Next, when the switch 15 of the control means 14 is turned off, no voltage is supplied to the igniter 4 and the electric charge accumulated in the capacitor 12 at the final stage is discharged via the resistor 13. For this reason, the output voltage of the igniter 4 falls. Thereafter, when the switch 15 is turned on, the igniter 4 again generates a high voltage. How many times this high voltage is applied to start depends on the starting voltage of the discharge lamp, the peak value of the high voltage to be generated, the width, the environmental conditions, etc., but by applying at least once, the discharge lamp 3 Starts. When the discharge lamp 3 is started, the discharge lamp 3 continues to be lit by the output from the power supply unit 1 via the discharge stabilization means 2. Further, after the discharge lamp 3 is turned on, the voltage at both ends thereof decreases to the lamp voltage, so that the igniter 4 does not generate a high voltage even when the switch 15 is turned on. Note that the switch 15 of the control means 14 may not be turned on after lighting. As a means for preventing the switch from being turned on, the control means 14 is provided with a timer function linked to turning on the power supply unit 1 so that the switch 15 is opened and closed only for a predetermined period, and a means for detecting the lighting of the discharge lamp 3 is provided. The switch 15 is turned off in response to the above.
[0031]
FIG. 2 is a circuit diagram showing a second embodiment of the present invention. The same or corresponding parts as in FIG. 1 are given the same reference numerals. In the present embodiment, the discharge lamp 3 is lit at high frequency using the high frequency generator 21. The high-frequency generator 21 in FIG. 2 is a series inverter mainly composed of a pair of switching elements 22 and 23 and a series resonance circuit 24. However, a parallel inverter, a full-bridge inverter, a single-stone inverter, or the like may be used. The high frequency generator 21 is configured to output a high frequency voltage of, for example, 200 KHz or higher, preferably 300 KHz or higher. Reference numeral 25 denotes a control means for controlling the operation of the high-frequency generator 21 and operates the high-frequency generator 21 discontinuously when the discharge lamp 3 is started. In this embodiment, it is operated periodically. In the present embodiment, the gate signals of the switching elements 22 and 23 can be supplied, and the high frequency generator 21 is periodically operated by outputting or stopping the gate signals. . 26 is a commercial frequency AC power source, and 27 is a rectifying means for rectifying and smoothing the output of the AC power source 26 as required.
[0032]
The igniter 4 ′ is the same as that of FIG. 1 except that the number of stages of rectification and smoothing is different. Reference numeral 28 denotes a lighting detection means, for example, which detects the lamp current of the discharge lamp 3 to control the control means 25, and thereafter causes the high frequency generator 21 to operate continuously.
[0033]
Next, the operation of this embodiment will be described with reference to FIG. When the AC power supply 26 is turned on, a DC voltage is supplied to the high frequency generator 21 via the rectifying means 27. The high frequency generator 21 is supplied with a gate signal for a period t shown in FIG. Therefore, a high-frequency voltage is output during this period t, and this high-frequency voltage is subjected to multiple voltage rectification by the igniter 4 ′ to generate the high voltage shown in FIG. In this embodiment, the period T for periodically operating the high frequency generator 21 is set to 2 seconds, and the period t for operating the high frequency generator 21 is set to 0.05 seconds. Further, the output voltage v of the igniter 4 ′ was set to about 3 KV.
[0034]
When such a high voltage is applied and the discharge lamp 3 starts, a lamp current flows, so that the lighting detection means 28 detects this and controls the control means 25. Therefore, the high frequency generator 21 is continuously operated thereafter to keep the discharge lamp 3 on.
[0035]
FIG. 4 is a partial sectional side view showing an embodiment of the illumination device of the present invention. This embodiment shows a ceiling-embedded illumination device, 41 is an appliance main body, and a high-intensity discharge lamp 42 is disposed on the appliance main body 41. Reference numeral 43 denotes a reflector disposed optically facing the discharge lamp 42, and reference numeral 44 denotes a translucent body provided in the irradiation opening of the main body 41. In order to start and light the discharge lamp 42, for example, the discharge lamp lighting device 45 of the embodiment described above is housed in the upper part of the instrument body 41. However, the discharge lamp lighting device 45 may be stored separately from the appliance main body 41.
[0036]
The lighting device is not limited to that shown in FIG. 4 and may be other types such as a direct ceiling type and a suspended type.
[0037]
【The invention's effect】
According to the first aspect of the present invention, the discharge resistor is connected in parallel with the capacitor at the final stage of the igniter that performs multiple voltage rectification, and the voltage supply to the igniter is made discontinuous. While the output is intermittent, the effective value can be lowered while starting the discharge lamp, and grounding can be simplified. Moreover, the problem of electric shock and deterioration of insulation of parts can be reduced.
[0043]
According to invention of Claim 2, the illuminating device which has the effect of Claim 1 can be provided.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing a second embodiment of the present invention.
FIG. 3 is a diagram showing the operation of the second exemplary embodiment of the present invention.
FIG. 4 is a partial cross-sectional side view showing an embodiment of the illumination device of the present invention.
FIG. 5 is a circuit diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Power supply part stabilizer, 2 ... Lighting stabilization means 3, 42 ... Discharge lamp 4, 4 '... Igniter, 13 ... Resistance, 14, 25 ... Control means,
21 ... high frequency generator, 41 ... instrument body, 45 ... discharge lamp lighting device

Claims (2)

A power supply unit that outputs an AC voltage; a discharge stabilization unit connected to the power supply unit; a discharge lamp energized by the output of the power supply unit via the discharge stabilization unit; an igniter configured to multiple precision voltage rectifier circuit as a subject that; the resistance for discharge that will be parallel connected to the smoothing capacitor of the last stage of the igniter; is at the start of at least the discharge lamp to the igniter together with the discharging resistor and control means Ru reduces the effective value of the voltage supplied to the discontinuity; equipped with, at the output rms value of the voltage (2 seconds or more) is more than 300 V, the lamp current is needed to more luminaires 1A A discharge lamp lighting device characterized by not requiring special type 3 grounding . An illuminating device comprising: the discharge lamp lighting device according to claim 1; a lighting fixture main body; a discharge lamp disposed in the lighting fixture main body and started and lit by the discharge lamp lighting device.

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