JP2008034335A - Discharge lamp lighting device, discharge lamp state detection device, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of easily measuring lighting integrating time without changing lamp characteristics. <P>SOLUTION: In the discharge lamp lighting device 11 with light output lit by switching PWM control, the length of a period of the PWM control is changed corresponding to the lighting integrating time. The lighting integrating time of a discharge lamp can be easily calculated by measuring the length of a period of the change of the light output. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device, a discharge lamp state detection device, and an illumination device that have an improved measuring mechanism of the discharge lamp lighting integrated time or lighting power.

  In general, a discharge lamp has a characteristic that its luminous flux maintenance factor decreases with life. For this reason, even if the lighting power of the discharge lamp is kept constant, the luminous flux changes at the beginning and end of the life. In order to solve this problem, the discharge lamp lighting time is accumulated, and based on the accumulated time, a correction value is obtained from a luminous flux maintenance table prepared in advance inside the microcomputer of the discharge lamp lighting device, and the lighting power is changed. There exists a method (for example, refer patent document 1).

  In addition to the above control, grasping the accurate lighting integration time and lamp lighting power of the lamps used can be done by estimating lamp life, planning maintenance plans, planning and checking energy saving designs, etc. Indispensable for this. Therefore, it is necessary to adopt a configuration in which the lighting integrated time and lighting power are stored in a nonvolatile memory in a microcomputer incorporated in the electronic ballast.

In order to provide a device, in a discharge lamp lighting device that includes a lighting frequency determination circuit that supplies an alternating current of a predetermined frequency to a discharge lamp, and controls the lighting of the discharge lamp, a control signal is sent to the lighting frequency determination circuit, and the discharge lamp A lighting frequency control means for controlling the lighting frequency, a lighting time integrating means for integrating the lighting time of the discharge lamp, and an integrated time storage means for storing the lighting integrated time obtained by the lighting time integrating means, The discharge lamp lighting characterized in that the lighting frequency determining circuit is controlled by the frequency control means so as to light the discharge lamp at a different lighting frequency in accordance with the discharge lamp lighting accumulated time stored in the accumulated time storage means. An apparatus is disclosed.
JP 2001-326086 A JP-A-2005-353445

  As described in Patent Document 1, in order to read the accumulated time and lamp lighting power, which are information stored in a nonvolatile memory or the like, a separate display unit or the like must be provided in the electronic ballast. However, in general, the lamp fixture and the electronic ballast body are rarely installed in a place where they can be directly operated, and it may be difficult to check the display unit itself. Moreover, there is a problem that the apparatus becomes expensive due to the provision of a separate display unit.

  In recent years, a technique for lighting a discharge lamp at a high frequency in order to reduce the size of a lighting device is widely known. Since the lamp power can be controlled by controlling the frequency by using the high frequency and the LC resonance circuit, the lamp power control can be simplified. For this reason, if the lighting frequency is changed as described in Patent Document 2, the power control may not be controlled.

  Furthermore, it is known that when a high-pressure discharge lamp is lit at a high frequency, an acoustic resonance phenomenon occurs depending on the lighting frequency, and the arc of the lamp bends, shakes, flickers or disappears. In addition, since the lighting frequency that causes this acoustic resonance varies depending on the life of the lamp and the lighting time, changing the lighting frequency in accordance with the cumulative lighting time may cause lighting at a lighting frequency that is likely to cause acoustic resonance. There is.

  The present invention has been made in view of the problem, and an object of the present invention is to provide a discharge lamp lighting device capable of easily measuring the lamp lighting integration time and the lamp lighting power.

  The discharge lamp lighting device according to the first aspect of the present invention includes a PWM control circuit that performs control to switch the light output so as to switch at least two steps in one cycle; lighting time integration means that integrates the lighting time of the discharge lamp; A PWM cycle control circuit for controlling the discharge lamp to be turned on by changing the length of one cycle of the PWM control according to the accumulated lighting time of the discharge lamp calculated by the time integrating means. And

The meaning is as follows.

It is preferable to set so that. By setting the light output to be switched from the initial state of the integrated lighting time, the light output can be stabilized for a long time by changing the duty ratio of the light output.

  The discharge lamps that can be lit by this discharge lamp lighting device include mercury lamps, metal halide lamps, high-pressure sodium lamps, and the like as high-pressure discharge lamps, and include ceramic discharge lamps and fluorescent lamps using alumina tubes as arc tubes.

  The lighting means integrating means counts the lighting time, integrates the lighting time of the discharge lamp up to the present time, and accepts what is stored in a nonvolatile memory or the like. One period of PWM control is determined according to the accumulated lighting time stored here.

A discharge lamp lighting device according to a second aspect of the present invention includes a chopper circuit that outputs a predetermined DC voltage; an inverter circuit that converts the DC voltage obtained by the chopper circuit into an AC voltage; and an output of the inverter circuit that is connected to the inverter circuit An LC resonance circuit for applying a voltage corresponding to the frequency to the discharge lamp; and a first lighting frequency and a second lighting frequency of the discharge lamp in one cycle of the PWM control so that the lamp power of the discharge lamp becomes a predetermined value. A PWM control circuit for controlling the ratio; an inverter control circuit for controlling the inverter circuit by switching between the first lighting frequency and the second lighting frequency at a ratio controlled by the PWM control circuit; and lighting for integrating the lighting time of the discharge lamp Time integration means; control to turn on the discharge lamp by changing the length of one cycle of PWM control according to the accumulated lighting time of the discharge lamp stored in the integration time storage means And a PWM cycle control circuit.

  The chopper circuit may take any form as long as the DC power source is boosted or lowered to a desired voltage value. For example, a step-up chopper circuit, a step-down chopper circuit, and combinations thereof are allowed. The inverter circuit supplies high-frequency power to the high-pressure discharge lamp via a resonance circuit based on the DC voltage obtained by the chopper circuit. For example, the inverter circuit has two switch elements and supplies the DC voltage from the rectifying and smoothing circuit. The two switch elements are alternately turned on and off from the inverter control circuit as an input, and are configured in a half-bridge type that outputs a high-frequency voltage to the output side. Supply high frequency power. In addition to the half-bridge type, a constant current push-pull type, one-stone type, full-bridge type inverter circuit may be used.

  The LC resonance circuit is composed of an inductor and a capacitor, and the power supplied to the discharge lamp can be varied according to the frequency of the high frequency voltage input from the inverter circuit. Further, when a high pressure discharge lamp is connected, a high voltage can be generated near the resonance frequency of the LC resonance circuit to start the high pressure discharge lamp.

  The PWM control circuit controls the ratio between the first lighting frequency and the second lighting frequency, and sets the ratio between the first lighting frequency and the second lighting frequency so that the lamp power of the discharge lamp becomes a predetermined value. decide. As a general method, when the lamp is lit in the slow phase region, the lamp power decreases when the lighting frequency is high, and the lamp power increases when the lighting frequency is low. The lamp power can be increased by increasing the ratio of the low frequency, and the light output can be controlled by controlling the lamp power.

  A discharge lamp lighting device according to a third aspect of the present invention is a chopper circuit that outputs a predetermined DC voltage; an inverter circuit that converts a DC voltage obtained by the chopper circuit into an AC voltage; an output of the inverter circuit connected to the inverter circuit LC resonance circuit for applying a voltage according to frequency to the discharge lamp; PWM control for switching the discharge lamp lighting frequency in one cycle of the predetermined PWM control so that the lamp power of the discharge lamp becomes a predetermined value A circuit; an inverter control circuit for controlling the inverter circuit by switching a lighting frequency by a PWM control circuit; a lighting time integrating means for integrating the lighting time of the discharge lamp; and an integrated lighting time of the discharge lamp stored in the integrated time storage means A PWM cycle control circuit for controlling the lighting of the discharge lamp by changing the switching state of the lighting frequency of one cycle of the PWM control according to It is characterized by providing.

  In the present invention, the PWM cycle control circuit is controlled so that the discharge lamp is lit at the lighting frequency by changing the switching state of the lighting frequency of one cycle of the PWM frequency according to the lighting integrated time. That is, it is allowed to change the order of the lighting frequencies to be switched during one cycle, which changes the number of lighting frequencies to be switched during the cycle.

  According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device comprising: a chopper circuit that outputs a predetermined DC voltage; an inverter circuit that converts a DC voltage obtained by the chopper circuit into an AC voltage; an output of the inverter circuit connected to the inverter circuit LC resonance circuit for applying a voltage according to frequency to the discharge lamp; PWM control for switching the discharge lamp lighting frequency in one cycle of the predetermined PWM control so that the lamp power of the discharge lamp becomes a predetermined value A circuit; an inverter control circuit for controlling the inverter circuit by switching a lighting frequency by a PWM control circuit; a lighting time integrating means for integrating the lighting time of the discharge lamp; and an integrated lighting time of the discharge lamp stored in the integrated time storage means In accordance with the P, control is performed so that the discharge lamp is lit by changing the switching state of the lighting frequency of one cycle of the PWM frequency and the length of the one cycle. And a WM cycle control circuit.

In the present invention, the PWM control circuit is configured to turn on the discharge lamp by PWM control according to the lighting integrated time by changing the switching state of the lighting frequency of one cycle of PWM control and changing the length of one cycle. And the PWM cycle control circuit is controlled.

  A fifth aspect of the invention is the discharge lamp lighting device according to the third or fourth aspect, wherein the switching state of the lighting frequency changes the number of frequencies switched during one cycle of PWM control. .

  A discharge lamp lighting device according to a sixth aspect of the present invention is a PWM control circuit that performs control to switch the light output so as to switch at least two steps in one cycle; and sets the lamp power of the discharge lamp based on an external signal A lamp power setting means; and a PWM cycle control circuit that controls the discharge lamp to light by changing the length of one cycle of the PWM control based on a set value of the lamp power setting means. To do.

  “Based on the set value of the lamp power setting means” includes not only the change of the cycle of the PWM cycle control circuit in accordance with the set value, but also the ratio of the lamp power to the rated value calculated from the set value. This also includes changing the period of the PWM cycle control circuit according to the above.

  A discharge lamp lighting device according to a sixth aspect of the present invention is a chopper circuit that outputs a predetermined DC voltage; an inverter circuit that converts a DC voltage obtained by the chopper circuit into an AC voltage; an output of the inverter circuit connected to the inverter circuit LC resonance circuit for applying a voltage according to frequency to the discharge lamp; lamp power setting means for setting the lamp power of the discharge lamp based on a signal from the outside; lamp power of the discharge lamp is set by the lamp power setting means A PWM control circuit that controls the ratio of the first lighting frequency and the second lighting frequency of the discharge lamp in one cycle of the PWM control so that the lamp power becomes the same; the first lighting at a ratio controlled by the PWM control circuit; An inverter control circuit for controlling the inverter circuit by switching between the frequency and the second lighting frequency; the length of one cycle of PWM control based on the set value of the lamp power setting means And a PWM cycle control circuit for controlling the discharge lamp to light up by changing the height.

  According to an eighth aspect of the present invention, there is provided the discharge lamp lighting device according to the sixth or seventh aspect, wherein the switching state of the lighting frequency by the PWM cycle control circuit is the lamp power when the discharge lamp is actually lit. Detecting by the lamp power detection means and switching based on the detection value of the lamp power detection means.

  A discharge lamp state detection device according to a ninth aspect of the present invention is the discharge lamp lighting device according to any one of the first to eighth aspects of the present invention; the light output of the discharge lamp is detected and measured by the PWM period of the detected light output A light output measuring instrument for measuring the lighting integrated time or lighting power of the high-pressure discharge lamp.

  By measuring the light output and measuring how the light output changes and the length of one cycle, it is possible to read the corresponding integrated lighting time or lighting power of the discharge lamp.

  The light output measuring device may be installed anywhere as long as the light output can be measured, and further, it is allowed to be configured to be portable.

  An illuminating device according to a tenth aspect of the present invention comprises: the discharge lamp lighting device according to any one of the first to eighth aspects; a discharge lamp that is lit by the discharge lamp lighting device; and an appliance main body to which the discharge lamp is mounted. It is characterized by having.

  According to the first or sixth aspect of the invention, the length of one cycle of the PWM control can be measured by measuring the change in the light output, and the life or lighting power of the discharge lamp corresponding to this can be measured. Therefore, it is possible to provide a discharge lamp lighting device that can easily measure the state of the discharge lamp without affecting the output characteristics of the discharge lamp. As a result, the accumulated lighting time and lighting power can be measured accurately and easily, so the remaining life of the discharge lamp can be estimated, maintenance can be planned more easily, and the current power consumption can be reduced. It can be easily grasped.

  According to the invention of claim 2 or 7, it is possible to provide a discharge lamp lighting device capable of stabilizing the power supply of the discharge lamp in addition to easily measuring the life or lighting power of the discharge lamp.

  According to the invention of claim 3, 4 or 5, it is possible to measure the lighting integrated time more finely by controlling the fine light output.

  According to the eighth aspect of the invention, since the actual lighting power of the discharge lamp can be accurately measured, more accurate lighting power information can be transmitted.

  According to the ninth aspect of the present invention, since the lighting integrated time or the lighting power can be measured by measuring the light output, it is possible to provide a discharge lamp state detecting device that can easily measure the state of the discharge lamp.

  According to the invention of claim 10, it is possible to provide an illuminating device having the effects of claims 1 to 8.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a discharge lamp lighting device according to an embodiment of the present invention.

  FIG. 1 is a block diagram of the high-pressure discharge lamp lighting device 11. The AC voltage from the AC power supply 12 is input to the rectifying / smoothing circuit 13 of the high-pressure discharge lamp lighting device 11 and converted into a DC voltage. The DC voltage obtained by the rectifying / smoothing circuit 13 is boosted to a predetermined voltage value by the boost chopper circuit 14. The DC voltage obtained by the step-up chopper circuit 14 is input to the inverter circuit 15, converted into a high-frequency voltage by turning on and off the switch elements Q 1 and Q 2 of the inverter circuit 15, and high-frequency power is supplied to the high-pressure discharge lamp 17 through the resonance circuit 16. Supply.

  The inverter circuit 15 has two switch elements Q1 and Q2, and the DC voltage from the boost chopper circuit 14 is input to the inverter circuit 15 so that the two switch elements Q1 and Q2 are alternately turned on / off by the inverter control circuit 20 to the output side. It is composed of a half-bridge type that outputs a high-frequency voltage. The resonance circuit 16 includes an inductor L1 and a capacitor C1. When the high-pressure discharge lamp 17 is started, a high voltage is generated near the resonance frequency of the resonance circuit 16 according to the frequency of the high-frequency voltage input from the inverter circuit 15. The high pressure discharge lamp 17 is turned on.

  The PWM control circuit 18 inputs the lamp power of the high-pressure discharge lamp 17 converted from the lamp voltage and lamp current detected by the lamp power detection circuit 19, and sets the first lighting frequency so that the lamp power becomes a predetermined value. PWM control of the ratio with the second lighting frequency. The inverter control circuit 20 performs switching control of the two switches Q1 and Q2 of the inverter circuit 15 by switching between the first lighting frequency and the second lighting frequency at a predetermined duty ratio and period set by the PWM control circuit 18. Here, the PWM control circuit 18 detects the switching of the inverter circuit 15 and starts the operation. This is because the control power of the PWM control circuit 18 is supplied after the oscillation of the inverter circuit 15 is started. Thereby, the lamp power from the start to the stable lighting can be changed.

  FIG. 2 is an explanatory diagram of a lighting waveform having a ratio of the first lighting frequency 45 kHz and the second lighting frequency 84 kHz in one period T with the PWM frequency. As shown in FIG. 2, within a predetermined PWM cycle T, a lamp current having a first lighting frequency of 45 kHz and a lamp current having a second lighting frequency of 84 kHz are alternately generated. Since the output of the LC resonance circuit connected to the output of the inverter circuit changes depending on the input frequency, the light output and lamp power during the period of operation at the first lighting frequency are large, and the output at the second lighting frequency is high. The operating light output and lamp power are low. The adjustment of the lamp power when the lamp power changes depending on the power supply voltage or the lamp state is performed by changing a so-called duty ratio that changes a ratio of operating time at the first lighting frequency 45 kHz and the second lighting frequency 84 kHz. This is because the lamp power is large at the first lighting frequency of 45 kHz where the lighting frequency is low and the lamp power is small at the second lighting frequency of 84 kHz where the lighting frequency is high. This is because the lamp power can be adjusted by changing the ratio.

  Here, the PWM frequency that defines the predetermined PWM cycle T is set to 100 Hz or more. The reason why the PWM frequency is set to 100 Hz or more is to prevent the visual sensitivity from responding to the change in the light output and not to flicker.

  The lamp power detection circuit 19 inputs the lamp voltage and lamp current of the high-pressure discharge lamp 17 to calculate the lamp power, confirms whether the high-pressure discharge lamp 17 is lit, and inputs it to the lighting integrated time calculation means 20. The calculated integrated lighting time is stored in the integrated lighting time calculation means 21.

  The method of changing the lighting frequency according to the lighting integrated time may be performed according to an appropriate rule or stored as a correspondence table (storage means 22) between the lighting integrated lighting time and the lighting frequency. In other words, the PWM control circuit 18 also serves as a PWM cycle control circuit, reads the lighting integrated time of the lamp 17 from the lighting time integrating means 21, and refers to the correspondence table in the storage means 22 to determine the read lighting integrated time. Extract the corresponding lighting frequency information. Then, the length of one cycle is determined and a control signal is sent to the inverter control circuit 20.

Here, as the correspondence between the lighting integrated time and the PWM cycle T, as shown in Table 1, a case where the lighting cycle T is changed at a constant rate every time the lamp lighting integrated time elapses is considered. In other words, the lighting frequency when a new lamp is installed is 5 msec, the lighting frequency is increased by 0.2 msec every 500 hours of accumulated discharge lamp lighting, and the lighting frequency becomes 10 msec when the accumulated lighting time is 12500 hours. After that, it will be constant thereafter. In addition, when the lamp is replaced, the stored lighting integrated time is initialized to 0 by inputting a reset signal, and the lighting frequency starts again from 5 msec. Further, the correspondence between the lighting integrated time and the lighting frequency is not limited to the example given here, and may be set as appropriate.

  According to the present embodiment, since the light output changes by switching the first lighting frequency and the second lighting frequency, the lamp power can be switched by switching the duty ratio by PWM control of the first lighting frequency and the second lighting frequency. The lighting integrated time can be notified by making the PWM control cycle correspond to the lighting integrated time.

  FIG. 3 is an explanatory diagram when reading the lighting integrated time in the discharge lamp lighting device according to the embodiment of the present invention. In the discharge lamp lighting device of the present embodiment, the lamp light output measuring instrument 40 is used as a lighting frequency detecting means for reading the lighting frequency. This lighting frequency detection means is provided separately from the main body of the electronic ballast 11 and the high-pressure discharge lamp 17.

  When the discharge lamp lighting device 11 is turned on, the lamp 17 is lit at a lighting frequency corresponding to the lamp integration time. When the lamp light output at this time is measured by the lamp light output measuring instrument 40, the light output intensity is measured. The length of one cycle T of the PWM control of the lamp output can be obtained from the time change. Then, since there is a correspondence between one cycle T of PWM control and the lighting integrated time, it is possible to know the lighting integrated time. That is, the lighting frequency is obtained by measuring the light output of the lamp, and the accumulated time is calculated backward from the correspondence table. For example, if it is found that one cycle T of the PWM control is 5.4 msec as a result of measurement by the light output measuring instrument 40, it can be seen that the lighting integrated time of the lamp is 1000 to 1500 hours.

  FIG. 4 is a block circuit diagram showing the second embodiment. In addition, about the structure similar to explanatory drawing of FIG. 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  This embodiment is different from the first embodiment in that the information for the PWM control circuit 18 to set the length of one cycle is a dimming signal 40 from the outside.

  That is, the method of changing the lighting frequency by the lamp power may be stored as a correspondence table (storage means 41) with the dimming signal 40 from the outside. That is, the PWM control circuit 18 also serves as a PWM cycle control circuit, acquires the dimming data input from the dimming signal 40, and refers to the correspondence table in the storage means 41 to obtain the read table value. Extract the corresponding lighting frequency information. Then, the length of one cycle is determined and a control signal is sent to the inverter control circuit 20.

Here, as correspondence between the lamp lighting power and the PWM cycle T, as shown in Table 2, it is considered that the lamp lighting power is changed at a certain rate and the lighting cycle T is changed at a certain rate. That is, the lighting frequency when the lamp lighting power is 100% of the rated value is 10 msec, and the lighting frequency is decreased by 0.5 msec every time the rated value decreases by 10%. The correspondence between the lamp lighting power and the lighting frequency is not limited to the example given here, and may be set as appropriate. For example, the correspondence may be made according to the output of the lamp power detection circuit 19. Although not shown, it may be possible to confirm a situation in which the lamp power is different for each lighting time when performing control such as so-called initial illuminance correction in combination with the lighting time integrating means.

  Then, by using the lamp light output measuring instrument 40 as shown in FIG. 3, when the discharge lamp lighting device 11 is turned on, the lamp 17 is lit at a lighting frequency corresponding to the dimming rate by an external signal. When the lamp light output at this time is measured by the lamp light output measuring instrument 40, the length of one cycle T of PWM control of the lamp output can be obtained from the temporal change of the light output intensity. Then, since there is a correspondence between one cycle T of the PWM control and the lamp lighting power, the actual lighting power of the lamp can be known.

  FIG. 5 is an explanatory diagram of a lighting waveform of PWM control in the third embodiment. In this embodiment, although the discharge lamp lighting device of FIG. 1 is used, the state where the switching of the lighting frequency is increased to three is shown. For example, as shown in Table 2, the number of switching of the lighting frequency can also be increased in correspondence with the lighting integrated time. In addition, by changing both the number of switching of the lighting frequency and the PWM cycle, it is possible to more precisely correspond to the lighting integrated time, so that the accuracy of measuring the lighting integrated time is increased.

  FIG. 6 is an explanatory diagram of a lighting waveform of PWM control in the fourth embodiment. In the present embodiment, the discharge lamp lighting device of FIG. 1 is used, but in this embodiment, the switching of the light output is not performed by switching the output of the booster circuit 14 by the PWM control circuit 18 without switching the lighting frequency. Is going. Also in this embodiment, it is possible to notify the lighting integrated time by associating the PWM control period and the number of switching of the output of the booster circuit 14 with the lighting integrated time.

  FIG. 7 is a schematic configuration diagram of a discharge lamp lighting device according to a fifth embodiment of the present invention. The discharge lamp lighting device 30 according to the present embodiment includes a rectifier circuit 31 that rectifies the power supply 12 into a DC voltage, a booster circuit 32 that boosts the DC voltage output from the rectifier circuit 31 to a predetermined voltage, and a step-down output voltage from the booster circuit 32. Thus, a voltage reduction circuit 33 that outputs a predetermined voltage and a full bridge circuit 34 that inverts the polarity of the DC voltage output from the voltage reduction circuit 33 and supplies an AC rectangular wave to the high-pressure discharge lamp 17 are schematically shown. The full bridge circuit 34 outputs alternating rectangular waves to a frequency of about 600 Hz by switching the four switching elements Q3, Q4, Q5, and Q6 alternately between Q3 and Q6 and Q4 and Q5.

  The lamp power detection circuit 38 detects lamp power from the output power of the step-down circuit 33. When the lamp power is detected, the lighting integration time is calculated together with the lighting integration means 39 storage means 37. The PWM control circuit 36 switches the output voltage of the step-down circuit 33 or controls the duty ratio so that the lamp power becomes a predetermined value. Thus, the PWM cycle T has a correspondence table corresponding to the accumulated lighting time in the storage means 37 to control the PWM cycle T of the output voltage of the step-down circuit 33.

  According to the present embodiment, since the high pressure discharge lamp can be lit at a low frequency at which acoustic resonance of the high pressure discharge lamp is difficult to occur, a discharge lamp lighting device that can obtain a stable discharge can be provided. Thus, it is possible to easily measure the lighting integrated time of the high-pressure discharge lamp 17. A discharge lamp lighting device is provided.

  A sixth embodiment of the present invention will be described with reference to FIG. FIG. 9 shows the lighting device 7 equipped with the lighting device 73 and the high-pressure discharge lamp LP of the first embodiment. The lighting device 7 includes a reflective shade 71, a socket 72, a lighting device 73, and the like. The base 7 of the metal halide lamp LP is attached to the socket 72 of the lighting device 7 and used. The secondary output terminal of the high pressure discharge lamp lighting device 73 is connected to the socket 72 to supply power to the high pressure discharge lamp LP. The lighting device 7 is supported by the ceiling surface 70.

1 is a schematic configuration diagram of a discharge lamp lighting device according to a first embodiment of the present invention. Similarly explanatory drawing of a lighting waveform. Explanatory drawing of the detection of the lighting integration time by a discharge lamp lighting device similarly. Schematic configuration diagram of a discharge lamp lighting device according to a second embodiment Explanatory drawing of the lighting waveform concerning 3rd Embodiment. Explanatory drawing of the lighting waveform concerning 4th Embodiment. The schematic block diagram of the discharge lamp lighting device concerning the 5th Embodiment of this invention. Similarly explanatory drawing of a lighting waveform. Schematic of the illuminating device concerning the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Discharge lamp lighting device, 12 ... Supply power supply, 14 ... Booster circuit, 15 ... Inverter circuit, 16 ... LC resonance circuit, 17 ... High pressure discharge lamp, 18 ... PWM control circuit, 21... Lighting time integrating means, 22.

Claims (10)

A PWM control circuit that performs control to switch the light output so as to switch at least two steps in one cycle;
Lighting time integrating means for integrating the lighting time of the discharge lamp;
A PWM cycle control circuit for controlling the discharge lamp to light by changing the length of one cycle of the PWM control according to the accumulated lighting time of the discharge lamp calculated by the lighting time integrating means;
A discharge lamp lighting device comprising: A chopper circuit that outputs a predetermined DC voltage;
An inverter circuit for converting a DC voltage obtained by a chopper circuit into an AC voltage;
An LC resonance circuit connected to the inverter circuit and applying a voltage corresponding to the output frequency of the inverter circuit to the discharge lamp;
A PWM control circuit that controls the ratio of the first lighting frequency and the second lighting frequency of the discharge lamp in one cycle of the PWM control so that the lamp power of the lamp becomes a predetermined value;
An inverter control circuit for controlling the inverter circuit by switching between the first lighting frequency and the second lighting frequency at a ratio controlled by the PWM control circuit;
Lighting time integrating means for integrating the lighting time of the discharge lamp;
A PWM cycle control circuit that controls the discharge lamp to light by changing the length of one cycle of the PWM control according to the accumulated lighting time of the discharge lamp stored in the accumulated time storage means;
A discharge lamp lighting device comprising: A chopper circuit that outputs a predetermined DC voltage;
An inverter circuit for converting a DC voltage obtained by a chopper circuit into an AC voltage;
An LC resonance circuit connected to the inverter circuit and applying a voltage corresponding to the output frequency of the inverter circuit to the discharge lamp;
A PWM control circuit for switching the lighting frequency of the discharge lamp in one cycle of the predetermined PWM control so that the lamp power of the discharge lamp becomes a predetermined value;
An inverter control circuit for controlling the inverter circuit by switching the lighting frequency with the PWM control circuit;
Lighting time integrating means for integrating the lighting time of the discharge lamp;
A PWM cycle control circuit for controlling the lighting of the discharge lamp by changing the switching state of the lighting frequency of one cycle of the PWM control according to the accumulated lighting time of the discharge lamp stored in the accumulated time storage means;
A discharge lamp lighting device comprising: A chopper circuit that outputs a predetermined DC voltage;
An inverter circuit that converts a DC voltage obtained by the chopper circuit into an AC voltage; an LC resonance circuit that is connected to the inverter circuit and applies a voltage according to the output frequency of the inverter circuit to the discharge lamp;
A PWM control circuit for switching the lighting frequency of the discharge lamp in one cycle of the predetermined PWM control so that the lamp power of the discharge lamp becomes a predetermined value;
An inverter control circuit for controlling the inverter circuit by switching the lighting frequency with the PWM control circuit;
Lighting time integrating means for integrating the lighting time of the discharge lamp;
PWM for controlling the lighting of the discharge lamp by changing the switching state of the lighting frequency of one cycle of the PWM frequency and the length of one cycle according to the lighting lighting lighting time stored in the cumulative time storage means A cycle control circuit;
A discharge lamp lighting device comprising: The discharge lamp lighting device according to claim 3 or 4, wherein the switching state of the lighting frequency changes the number of frequencies switched during one period of PWM control. A PWM control circuit that performs control to switch the light output so as to switch at least two steps in one cycle;
Lamp power setting means for setting the lamp power of the discharge lamp based on an external signal;
A PWM cycle control circuit for controlling the lighting of the discharge lamp by changing the length of one cycle of the PWM control based on the set value of the lamp power setting means;
A discharge lamp lighting device comprising: A chopper circuit that outputs a predetermined DC voltage;
An inverter circuit for converting a DC voltage obtained by a chopper circuit into an AC voltage;
An LC resonance circuit connected to the inverter circuit and applying a voltage corresponding to the output frequency of the inverter circuit to the discharge lamp;
Lamp power setting means for setting the lamp power of the discharge lamp based on an external signal;
A PWM control circuit for controlling the ratio of the first lighting frequency and the second lighting frequency of the discharge lamp in one cycle of the PWM control so that the lamp power of the discharge lamp becomes the lamp power set by the lamp power setting means; ;
An inverter control circuit for controlling the inverter circuit by switching between the first lighting frequency and the second lighting frequency at a ratio controlled by the PWM control circuit;
A PWM cycle control circuit for controlling the lighting of the discharge lamp by changing the length of one cycle of the PWM control based on the set value of the lamp power setting means;
A discharge lamp lighting device comprising:   The switching state of the lighting frequency by the PWM cycle control circuit can be switched by detecting the lamp power when the discharge lamp is actually lit by the lamp power detecting means and based on the detection value of the lamp power detecting means. The discharge lamp lighting device according to claim 6 or 7. A discharge lamp lighting device according to any one of claims 1 to 8;
A light output measuring device that detects the light output of the discharge lamp and measures the integrated lighting time or lighting power of the high-pressure discharge lamp measured by the PWM period of the detected light output;
A discharge lamp state detection device comprising: A discharge lamp lighting device according to any one of claims 1 to 8;
A discharge lamp to be lit by a discharge lamp lighting device;
An instrument body to which a discharge lamp is mounted;
An illumination device comprising: