JP2008084684A - Discharge lamp lighting device and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress evil effects on detecting operation of an acoustic resonance phenomenon by transitional change of a lamp voltage or change of a voltage level itself accompanied with changes of an oscillating frequency or a lighting frequency of a high frequency generating device. <P>SOLUTION: A detecting means 19 detects the acoustic resonance phenomenon based on a lamp voltage value of a high brightness discharge lamp 18 only when energized by either one of the oscillating frequencies out of different oscillating frequencies (Fig. 2 (a)). Accordingly, it is hard to be effected by changes of a lamp voltage level generated by the transitional lamp voltage changes and differences of the frequencies generated at changing the oscillating frequency. Moreover, when the acoustic resonance phenomenon actually occurs, it surely detects the lamp voltage fluctuations at this time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device and an illuminating device that can light a high-intensity discharge lamp at high frequency and suppress the occurrence or continuation of an acoustic resonance phenomenon.

Conventionally, a discharge lamp lighting device has been proposed as a discharge lamp lighting device for lighting a high-intensity discharge lamp at high frequency and suppressing the occurrence of an acoustic resonance phenomenon. The technique disclosed in Patent Document 1 is the ratio between the first lighting frequency and the second lighting frequency in the first stable window in which the acoustic resonance phenomenon of the high-intensity discharge lamp does not occur within one cycle of the predetermined PWM frequency. The switching frequency of the inverter is switched while controlling the lamp power of the high-intensity discharge lamp to a predetermined value.
JP 2004-241370 A

  As described above, Patent Document 1 is useful because it does not cause an acoustic resonance phenomenon and can control the lamp power to a predetermined value.

  However, according to experiments by the present inventors, it has been found that there are further points to be improved in order to actually realize a discharge lamp lighting device.

  That is, it has been found that when the high-intensity discharge lamp is lit by switching different frequencies within a predetermined period, as shown in FIG. Further, for example, when different frequencies are the first frequency and the second frequency, it is understood that the lamp voltage changes between when the light is lit at the first frequency and when the light is lit at the second frequency. It was.

  This will be described in detail with reference to FIG. FIG. 5 shows a lamp voltage value (FIG. 5A) and a lamp current value (FIG. 5B) when a high-intensity discharge lamp is lit at a first lighting frequency and a second lighting frequency in a predetermined cycle. Is shown. FIG. 5 shows the case where the predetermined period is 10 msec, the first lighting frequency is 30 kHz, and the second lighting frequency is 60 kHz.

  As shown in FIG. 5, when switching from the first lighting frequency to the second lighting frequency, the lamp voltage once decreases greatly, then rises up and finally from the time of lighting at the first lighting frequency. growing. On the other hand, when switching from the second lighting frequency to the first lighting frequency, the lamp voltage increases for a short time, and then settles to a substantially constant level (smaller than when lighting at the second lighting frequency).

  Therefore, when the lamp voltage is detected and an acoustic resonance phenomenon is detected according to the lamp voltage value, the lamp voltage change at the time of the frequency switching or the lamp voltage level change due to the lighting frequency is erroneously detected. Sometimes it was detected as a resonance phenomenon.

  Further, when it is attempted to make the power supplied to the high-intensity discharge lamp constant based on the lamp voltage, there is a case where stable constant control cannot be performed due to the change in the lamp voltage. On the other hand, if the supply voltage is detected by detecting the average value or effective value over a sufficiently long period of time, stable stabilization control may be possible. This means that control cannot be performed.

  The present invention suppresses adverse effects on the acoustic resonance phenomenon detection operation due to a transient change in the lamp voltage or a change in the level itself due to a change in the oscillation frequency of the high-frequency generator, that is, the lighting frequency. An object of the present invention is to provide a discharge lamp lighting device and a lighting device capable of stably lighting an electric lamp.

  In addition, the present invention stabilizes a high-intensity discharge lamp by suppressing the transient change of the lamp voltage or the change of the level itself associated with the change of the oscillation frequency of the high-frequency generator, that is, the lighting frequency, from the lamp power detection signal. An object of the present invention is to provide a discharge lamp lighting device and a lighting device that can be turned on.

  The discharge lamp lighting device according to claim 1 energizes the high-intensity discharge lamp and changes the power supplied to the high-intensity discharge lamp according to its own oscillation frequency; A control device capable of changing the oscillation frequency of the generator to two or more different from each other and controlling the time ratio of these different oscillation frequencies; and being energized at any one of the different oscillation frequencies Detecting means for detecting an acoustic resonance phenomenon based on the lamp voltage value of the high-intensity discharge lamp.

  In the present invention and each of the following inventions, the scope or meaning of each component and term is as follows.

  The target high-performance discharge lamps are mercury lamps, metal halide lamps, high-pressure sodium lamps, etc., which are discharge lamps that may cause an acoustic resonance phenomenon during starting and lighting. The dimensions, shape, material, etc. are not limited.

  Although the specific configuration of the high-frequency generator is not limited, the power supplied to the high-intensity discharge lamp can be changed by changing the oscillation frequency, and typically includes a parallel or series resonant circuit. An inverter that outputs a sine wave voltage is mainly configured. A high frequency power supply device mainly composed of an inverter has been widely put into practical use, and can be easily adopted at a relatively low cost. The inverter may be of any type such as a half bridge type, a full bridge type, a single stone type, or a parallel type. And what supplies a high frequency electric power directly with respect to a discharge lamp, or what supplies through insulation means, such as a transformer, may be sufficient.

  The high-frequency generator outputs a high-frequency voltage having a waveform that causes a high-intensity discharge lamp to generate an acoustic resonance phenomenon. That is, it is known that a general high-intensity discharge lamp is less likely to cause an acoustic resonance phenomenon with a rectangular wave voltage and is more likely to occur with a sine wave. Therefore, in the present invention, a high frequency generator that outputs a sinusoidal high frequency voltage is a typical target, but the present invention is not limited to this, and eventually depends on a combination with a high-intensity discharge lamp, Targets those that may cause acoustic resonance.

  Furthermore, the high frequency exceeds the commercial frequency, but is preferably higher than the audible frequency, and the upper limit is preferably several hundred kHz or lower in terms of high frequency noise and switching loss.

  Two or more types of oscillation frequencies of the high-frequency generator to be varied within a predetermined period depending on the control device, if at least one of them is within the stable lighting window (frequency region where no acoustic resonance phenomenon occurs) It may be in a stable lighting window or in an unstable lighting area. Moreover, the control apparatus may change the length of a predetermined period as needed.

  The detection means detects an acoustic resonance phenomenon based on the lamp voltage. That is, when an acoustic resonance phenomenon occurs in a high-intensity discharge lamp, the lamp voltage increases in a relatively initial state, and the lamp voltage pulsates when the arc is fluctuating. Therefore, it is possible to detect that an acoustic resonance phenomenon has occurred by monitoring the lamp voltage.

  The detecting means detects the acoustic resonance phenomenon based on the lamp voltage when operating at any one of the oscillation frequencies energized at a plurality of oscillation frequencies within a predetermined period. Here, when operating at any one of the oscillation frequencies, it may be the entire period when operating at any one of the oscillation frequencies, but as shown in FIG. Since the lamp voltage changes, it is possible to avoid this period. When the detection means detects an acoustic resonance phenomenon, at least one of the oscillation frequencies within a predetermined period is changed to a frequency at which no acoustic resonance phenomenon occurs, or the time ratio with a different oscillation frequency is changed. Thus, it is preferable to control the oscillation frequency so as to eliminate the acoustic resonance phenomenon. However, the output of the high frequency generator may be stopped and forcibly turned off in order to eliminate discomfort caused by continued lighting in an unstable state and reduce the burden on the lighting device.

  According to the first aspect of the present invention, the detection means detects the acoustic resonance phenomenon based on the lamp voltage value of the high-intensity discharge lamp when being energized at any one of the different oscillation frequencies. . Therefore, it is difficult to be affected by the transient lamp voltage change that occurs when the oscillation frequency is changed, and the lamp voltage level change that is caused by the difference in frequency, and when the acoustic resonance phenomenon actually occurs, the lamp voltage fluctuation at this time is not affected. Detect and detect the acoustic resonance phenomenon.

  The discharge lamp lighting device according to claim 2 energizes the high-intensity discharge lamp and changes the power supplied to the high-intensity discharge lamp according to its own oscillation frequency; Different from the control device that changes the oscillation frequency of the generator to two or more different from each other, and controls the time ratio of these different oscillation frequencies to bring the power supplied to the high-intensity discharge lamp closer to a predetermined value set in advance; The power supply to the high-intensity discharge lamp is calculated based on the lamp voltage value of the high-intensity discharge lamp when it is energized at any one of the oscillation frequencies, and the oscillation frequency time ratio of the control device is calculated. And a detecting means for reflecting in the control.

  The control device according to the second aspect of the invention controls the power supplied to the high-intensity discharge lamp by controlling the time ratio of the different oscillation frequencies of the high-frequency generator. Therefore, the predetermined period may be fixed, and the time ratio within the period may be changed. However, the order and duration of the lighting frequency are fixed and the period can be changed within a preset range. The ratio may be changed.

  In addition, calculating the power supplied to the high-intensity discharge lamp based on the lamp voltage value by the detection means in the second aspect of the invention allows the lamp current to be detected and calculated. In this case, the power can be calculated by the lamp voltage at the time of lighting at any one of the oscillation frequencies × the lamp current, and the supplied power can be calculated by the time ratio within a predetermined period. However, the present invention may be any method other than this method as long as the power supplied to the high-intensity discharge lamp can be calculated.

  According to the second aspect of the present invention, the supply to the high-intensity discharge lamp is based on the lamp voltage value of the high-intensity discharge lamp when the detection means is energized at any one of the different oscillation frequencies. Calculate power. For this reason, the detection means does not change the calculated value due to a transient lamp voltage change that occurs when the oscillation frequency is changed or a lamp voltage level change that occurs due to a difference in frequency. For this reason, the operation of the control device that changes the time ratio of the oscillation frequency in accordance with the calculated value of the detection means becomes stable.

  The discharge lamp lighting device according to claim 3 is the discharge lamp lighting device according to claim 1 or 2, wherein a rectifying means for rectifying a commercial AC power supply voltage is provided on an input side of the high frequency generator; and an output voltage of the rectifying means. An output variable DC power supply device that smoothes the output voltage, and the control means changes the output voltage value of the DC power supply device according to the type of oscillation frequency within the predetermined period. Features.

  In the high-intensity discharge lamp, when the oscillation frequency (lighting frequency) is changed within a predetermined period, the lamp voltage level differs for each lighting frequency as described with reference to FIG. Further, the lamp voltage changes transiently when the lighting frequency is changed. In such a case, when the lamp voltage changes greatly, the high-intensity discharge lamp may disappear due to the relationship with the applied voltage (the applied voltage is relatively small).

  For this reason, in the invention described in claim 3, the output of the DC power supply device is changed according to the type of the lighting frequency. For example, in FIG. 5, the output voltage of the DC power supply device is set larger during the period of lighting at the second lighting frequency than during the period of lighting at the first lighting frequency. As a result, the high-intensity discharge lamp can be lit without being extinguished, and the selection range of the second lighting frequency can be expanded.

  At the same time or separately, the output voltage of the DC power supply device may be changed only for a short time when changing from the second lighting frequency to the first lighting frequency. Here, the short time can be determined corresponding to the time during which the lamp voltage rises transiently by changing the oscillation frequency. For example, as shown in FIG. 5, since the rapid increase of the lamp voltage when changing from the second lighting frequency to the first lighting frequency is at most 0.1 to 0.2 msec, it is about the same or slightly higher than this. Just set a larger value.

  Further, the timing for greatly changing the output voltage value of the DC power supply device may be all timings for changing the frequency other than when changing from the second lighting frequency to the first lighting frequency. This is because applying a sufficiently large voltage when the lamp voltage changes suddenly is considered to affect discharge stabilization.

  The lighting device according to claim 4 is a lighting device body; a high-intensity discharge lamp mounted on the lighting device body; and a discharge lamp lighting device according to any one of claims 1 to 3 that lights the high-intensity discharge lamp. And characterized by comprising:

  In the present invention, the luminaire main body may be either outdoor or indoor, and may have any shape such as an embedded shape or an exposed shape. Further, the discharge lamp lighting device does not necessarily have to be provided entirely in the lighting fixture body.

  According to the invention described in claim 4, by using the discharge lamp lighting device having the same function as that of any one of claims 1 to 3, the acoustic resonance phenomenon can be correctly detected, or the lamp power is set to a predetermined value. Can be controlled.

  In the present specification, “target” in series and parallel means that both the case of series or parallel with other components interposed and the case of series or parallel without intervening are included.

  According to the first aspect of the present invention, the acoustic resonance phenomenon is detected based on the lamp voltage value of the high-intensity discharge lamp only when energized at any one of the different oscillation frequencies. It is difficult to be affected by the transient lamp voltage change that occurs when the frequency is changed and the lamp voltage level change caused by the difference in frequency, and when an acoustic resonance phenomenon actually occurs, the lamp voltage fluctuation at this time is detected and the sound is detected. A resonance phenomenon can be detected.

  According to the second aspect of the present invention, the detection means applies the high-intensity discharge lamp to the high-intensity discharge lamp based on the lamp voltage value of the high-intensity discharge lamp when being energized at any one of the different oscillation frequencies. Since the power supply is calculated, the calculated value can be reduced from being affected by a transient lamp voltage change that occurs when the oscillation frequency is changed, or a lamp voltage level change that is caused by a difference in frequency. It can be turned on with electric power, and the operation of the entire apparatus can be stabilized.

  According to the invention of claim 3, since the output of the DC power supply device is changed according to the type of the lighting frequency within the predetermined period, it is possible to light the high-intensity discharge lamp without turning it off. At the same time, it is possible to widen the selection range of the lighting frequency.

  According to invention of Claim 4, the illuminating device which has an effect similar to either of the invention of Claim 1 thru | or 3 can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between a lighting frequency, a lamp voltage value, and a lamp current value for explaining the operation of the embodiment.

  In FIG. 1, reference numeral 1 denotes a commercial power supply, and the output voltage of the commercial power supply 1 is input to a rectifying means 2 such as a full-wave rectifier. The output voltage of the rectifying means 2 is supplied to a DC power supply device 3 such as an active filter and converted into a desired DC voltage. The DC power supply device 3 in the present embodiment includes a filter capacitor 4 provided on the input side, a switching device 5 constituted by a field effect transistor, a power storage inductor 6, a backflow prevention diode 7 and a smoothing. This is a step-up chopper configured with the capacitor 8 as a main component. The DC power supply device 3 controls the ON period of the switching device 5 by a signal from the output control means 9 (on-duty control when the cycle is constant or frequency control when the ON period is constant). Be controlled. The configuration and operation of such a DC power supply device 3 are well known.

  The output voltage of the DC power supply device 3 is supplied to the high frequency generator 10 and converted into a high frequency voltage. The high-frequency generator 10 mainly includes a pair of switching devices 11 and 12 and a series resonant circuit 13 connected in series between output terminals of the DC power supply device 3. Each of the pair of switching devices 11 and 12 is configured by a field effect transistor, and is turned on and off alternately by the control device 14.

  The series resonance circuit 13 includes a DC cut capacitor 15, a current limiting / resonance inductor 16 and a resonance capacitor 17 in series, and is provided in parallel with the drain / source of one switching device 12. . Therefore, if the switching frequency (oscillation frequency) of the pair of switching devices 11 and 12 is set as the slow phase region of the resonance characteristics of the series resonance circuit 13, the resonance output decreases as the oscillation frequency increases.

  A high-intensity discharge lamp 18 is provided in parallel to the resonance capacitor 17 of the series resonance circuit 13.

  Furthermore, a detection means 19 is provided for the high-intensity discharge lamp 18. The detection means 19 in this embodiment detects the lamp voltage of the high-intensity discharge lamp 18 and detects the lamp current. That is, the lamp voltage detector 20 connected in parallel to the high-intensity discharge lamp 18, the lamp current detector 21 connected in series, and the detection signals of these detectors 20, 21 are input to calculate and compare And a processing unit 22 for storing and the like. Then, the power supplied to the high-intensity discharge lamp 18 in the period excluding the transitional fluctuation at the initial stage of switching from the lighting period at the first lighting frequency is calculated, or the acoustic resonance phenomenon is detected separately (electricity in FIG. 2). Characteristic measurement period).

  The processing unit 22 of the detection unit 19 controls the control device 14 according to at least one of the detection result and the calculation result. That is, at least one of the oscillation frequency or the time ratio of the oscillation frequency is changed. Further, the output control device 9 may be controlled by the processing unit 22 of the detection means 19.

  It should be noted that the signal processing parts such as calculation, comparison, and storage of the detection means 19, the control device 14, and the output control device 9 can be constituted by an IC, a microcomputer, a digital signal processor, etc., and these are integrally configured. You can also

  Next, an outline of the operation of the first embodiment will be described. The voltage of the commercial power source 1 is converted into a DC voltage smoothed by the DC power source device 3 and supplied to the high frequency generator 10. In the high frequency generator 10, a pair of switching devices 11 are switched between a first oscillation frequency (eg, between 20 kHz and 30 kHz) and a second oscillation frequency (between 60 kHz and 80 kHz) within a predetermined period (eg, 10 msec), 12 is turned on and off. The series resonance circuit 13 is supplied with such a switching output and resonates, and turns on the high-intensity discharge lamp 18 with the resonance output.

  During the period when the high-intensity discharge lamp 18 is stably lit, the detection means 19 detects the lamp voltage and the lamp current, monitors the occurrence of the acoustic resonance phenomenon, and supplies power to the high-intensity discharge lamp 18. We are trying to make it constant.

  That is, on the other hand, the presence or absence of an abnormal voltage in the lamp voltage is monitored, and the occurrence of an acoustic resonance phenomenon is monitored. On the other hand, the supply power is calculated from the integration of the lamp voltage signal and the lamp current signal and the lighting time ratio at the first lighting frequency, and if there is a difference due to a comparison with a set value set in advance, this The control device 14 is controlled to change the time ratio of the lighting frequency so that the difference is reduced.

  Here, when the high-intensity discharge lamp 18 causes an acoustic enemy resonance phenomenon due to the end of its life, the surrounding environment, the mounting posture, or the characteristic degree of each discharge lamp, the lamp voltage schematically represented as (a) in FIG. Rise.

  Since the rise of the lamp voltage is detected by the detection means 19, the detection means 19 controls the control device 14 to change the time ratio of the lighting frequency or to change the first lighting frequency itself. Of course, the second lighting frequency may also be changed.

  Note that although a change also occurs in the lamp current (b) due to the occurrence of the acoustic resonance phenomenon, the drawing for this change is omitted in FIG. 2 (b).

  Next, a second embodiment of the present invention will be described. FIG. 3 is a diagram showing the relationship between the lighting frequency, the lamp voltage value, the lamp current value, and the output voltage value of the DC power supply for explaining the operation of the second embodiment of the present invention. 3A and 3B show the lamp voltage value and the lamp current value according to the lighting frequency as in FIG. 2, while FIG. 3C shows the DC power supply device according to the lighting frequency. A mode that an output voltage value changes is shown typically. The circuit configuration of this embodiment can be the same as that of FIG.

  In the present embodiment, the control device 14 changes the output voltage value of the DC power supply device 3 according to the change of the oscillation frequency (lighting frequency) according to the detection result from the detection means 19. First, the output of the DC power supply device 3 is set larger during the period of lighting at the second lighting frequency than during the period of lighting at the first lighting frequency.

  Further, when switching from the second lighting frequency to the first lighting frequency, the output voltage value of the DC power supply device 3 is further increased. And, it is set to the smallest voltage during the lighting period at the first lighting frequency.

  In this embodiment as well, from the detection of the acoustic resonance phenomenon, the detection from the supply power to the stabilization control may be performed as in the first embodiment.

  Next, an embodiment of a lighting device according to the present invention will be described with reference to FIG. FIG. 4 is a partial cross-sectional view schematically showing an embodiment of the lighting device.

  In FIG. 4, reference numeral 40 denotes a lighting fixture body, which is configured as a spotlight and is directly attached to the ceiling surface 41. Reference numeral 42 denotes a single-piece high-intensity discharge lamp, which is attached to the socket 43. The high-intensity discharge lamp 42 is provided with a bowl-shaped reflector 44 that is optically opposed.

  A front glass 45 is disposed on the opening side of the reflector 44 so that light from the high-intensity discharge lamp 42 is irradiated from the light projection opening of the reflector 44 through the front glass 45. .

  A discharge lamp lighting device 46 lights the high-intensity discharge lamp 42, and performs the same operation as that of the above-described embodiment. In the present embodiment, the discharge lamp lighting device 46 is disposed in the ceiling.

  The lighting device according to the present embodiment is suitable for use as a spot lighting device in a store, a studio, and the like, and can suppress the occurrence or continuation of the acoustic resonance phenomenon, thereby reducing the problem of light flickering and extinction.

  Further, it is possible to control the power supply to the high-intensity discharge lamp to be constant, and the light output can be made constant.

The circuit diagram which shows 1st Embodiment of the discharge lamp lighting device of this invention The figure which shows the relationship between the lighting frequency for demonstrating the effect | action of the embodiment, a lamp voltage value, and a lamp current value The figure which shows the relationship between the lighting frequency for demonstrating the effect | action of the 2nd Embodiment of this invention, a lamp voltage value, a lamp current value, and the output voltage value of a DC power supply device. The partial cross section figure which simplifies and shows one Embodiment of the illuminating device of this invention The figure which shows the relationship between the lighting frequency in a conventional apparatus, a lamp voltage value, and a lamp current value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Rectification means, 3 ... DC power supply device, 9 ... Output control means, 10 ... High frequency generator, 13 ... Series resonance circuit, 14 ... Control apparatus, 18 ... High-intensity discharge lamp, 19 ... Detection means, 20 ... Lamp voltage Detector, 21... Lamp current detector, 22.

Claims (4)

A high-frequency generator that energizes the high-intensity discharge lamp and changes the power supplied to the high-intensity discharge lamp according to its own oscillation frequency;
A control device capable of changing the oscillation frequency of the high-frequency generator to two or more different from each other within a predetermined period and controlling the time ratio of these different oscillation frequencies;
Detecting means for detecting an acoustic resonance phenomenon based on a lamp voltage value of the high-intensity discharge lamp when energized at any one of different oscillation frequencies;
A discharge lamp lighting device comprising: A high-frequency generator that energizes the high-intensity discharge lamp and changes the power supplied to the high-intensity discharge lamp according to its own oscillation frequency;
Within a predetermined period, the oscillation frequency of the high-frequency generator is changed to two or more different from each other, and the time ratio of these different oscillation frequencies is controlled to bring the power supplied to the high-intensity discharge lamp closer to a preset predetermined value A control device;
Calculate the power supplied to the high-intensity discharge lamp based on the lamp voltage value of the high-intensity discharge lamp when energized at any one of the different oscillation frequencies, and the oscillation frequency time of the control device Detection means to be reflected in the ratio control;
A discharge lamp lighting device comprising:   And a rectifying means for rectifying a commercial AC power supply voltage; and an output variable DC power supply apparatus for smoothing an output voltage of the rectifying means, on the input side of the high-frequency generator. The discharge lamp lighting device according to claim 1 or 2, wherein an output voltage value of the DC power supply device is changed in accordance with the type of oscillation frequency within. A lighting fixture body;
A high-intensity discharge lamp mounted on the luminaire body;
The discharge lamp lighting device according to any one of claims 1 to 3, which lights a high-intensity discharge lamp;
An illumination device comprising:

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