JP2007059148A

JP2007059148A - Discharge lamp lighting device

Info

Publication number: JP2007059148A
Application number: JP2005241550A
Authority: JP
Inventors: Toshio Tsuji; 俊雄辻; Toshiyuki Hiraoka; 敏行平岡; Kimihito Sato; 公仁佐藤; Noriyuki Kitamura; 紀之北村; Koji Takahashi; 浩司高橋; Naoko Iwai; 直子岩井; Masatoshi Kumagai; 昌俊熊谷
Original assignee: Toshiba Lighting and Technology Corp
Current assignee: Toshiba Lighting and Technology Corp
Priority date: 2005-08-23
Filing date: 2005-08-23
Publication date: 2007-03-08

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of preventing drop of luminous flux of a discharge lamp in emergency lighting and of extending emergency lighting by using, in emergency lighting in common, a regular lighting device for controlling the lighting of the discharge lamp with constant power in normal lighting. <P>SOLUTION: A D.C. voltage obtained from a rectifier 13 for providing a direct current by rectifying A.C. power is normally raised by a step-up circuit 14, and an inverter circuit 15 converts the raised voltage to a high-frequency voltage to light the discharge lamp 17 with high frequency. An emergency power charging circuit 18 charges an emergency power source 21 with D.C. power obtained from the rectifier 13. An emergency power step-up circuit 22 raises the voltage of the emergency power source 21 in emergency. A lighting control part 27 executes a normal lighting operation for lighting the discharge lamp with constant power at high frequency by converting the voltage raised by the step-up circuit 14 to a high-frequency voltage in a normal time and executes an emergency lighting operation for dimming and lighting the discharge lamp 17 with constant power by converting the voltage from the emergency power step-up circuit 22 to a high-frequency voltage in an emergency time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、通常時は交流電源で放電灯を点灯させる常用点灯装置と、交流電源の停電時には非常用電源で放電灯を点灯させる非常用点灯装置とを一体的に形成した放電灯点灯装置に関する。 The present invention relates to a discharge lamp lighting device in which a normal lighting device for lighting a discharge lamp with an AC power source in a normal state and an emergency lighting device for lighting a discharge lamp with an emergency power source when a power failure occurs in the AC power source. .

通常時においては放電灯を常用点灯装置で点灯しつつ非常用電源に充電し、商用の交流電源が停電となった場合には、非常用点灯装置で非常用電源からの電源により放電灯を非常灯として点灯させる照明器具がある。このような照明器具では、常用点灯装置と非常用点灯装置とを照明器具内に別々に搭載している。常用点灯装置および非常用点灯装置が個別に装備されているので、構成部品の中に重複するものが多く、部品コストの上昇を招くと共に器具組立にも手数がかかる。そこで、常用点灯装置および非常用点灯装置の構成部品の重複するものを少なくし、部品コストを低減するできるようにしたものがある（特許文献１参照）。
特開２００５−３８７５４号公報 In normal times, the discharge lamp is lit by the emergency lighting device while charging the emergency power supply. When the commercial AC power supply fails, the emergency lighting device uses the emergency power supply to power the discharge lamp. There are lighting fixtures that are turned on as lights. In such a lighting fixture, the regular lighting device and the emergency lighting device are separately mounted in the lighting fixture. Since the regular lighting device and the emergency lighting device are individually provided, many of the components are duplicated, resulting in an increase in the cost of the components and a trouble in assembling the appliance. In view of this, there is a configuration in which the component parts of the regular lighting device and the emergency lighting device are reduced to reduce the component cost (see Patent Document 1).
JP 2005-38754 A

しかし、常用点灯装置と非常用点灯装置との構成分品の重複を避けるにあたっては、常用点灯装置や非常用点灯装置の機能を損なわないようにしなければならない。例えば、常用点灯装置のインバータ回路を共用して、通常時および非常時において放電灯を点灯させる場合、単にインバータ回路を共用しただけでは非常時の非常点灯動作を適切に行うことができない。例えば、非常時においては非常用電源から放電灯に電力が供給されるが、非常用電源の電圧が低下した場合には放電灯の光束が低下し、規格化されている所定照度を所定時間内に維持することができない虞がある。また、非常点灯時において放電灯が高温になった場合には放電灯が消灯することがある。 However, in order to avoid duplication of components between the regular lighting device and the emergency lighting device, the functions of the regular lighting device and the emergency lighting device must not be impaired. For example, in the case where the inverter circuit of the common lighting device is shared and the discharge lamp is lit in the normal time and the emergency time, the emergency lighting operation in the emergency time cannot be appropriately performed only by sharing the inverter circuit. For example, in an emergency, power is supplied from the emergency power supply to the discharge lamp, but when the voltage of the emergency power supply decreases, the luminous flux of the discharge lamp decreases and the standardized predetermined illuminance is maintained within a predetermined time. There is a possibility that it cannot be maintained. Further, when the discharge lamp becomes hot during emergency lighting, the discharge lamp may be turned off.

本発明の目的は、通常点灯時において定電力で放電灯を点灯制御する常用点灯装置を非常点灯時に共用し、非常点灯時に放電灯の光束低下を防止できるとともに非常点灯を長くすることができる放電灯点灯装置を提供することである。 It is an object of the present invention to share a common lighting device that controls lighting of a discharge lamp with constant power during normal lighting in an emergency lighting, to prevent a decrease in luminous flux of the discharge lamp during emergency lighting and to increase the length of emergency lighting. It is to provide an electric lighting device.

請求項１の発明に係わる放電灯点灯装置は、通常時は交流電源を整流して得られた直流を高周波変換し放電灯を高周波点灯する常用点灯装置と、通常時は交流電源を整流して非常用電源を充電するとともに非常時は非常用電源を電源として放電灯を非常点灯させる非常用点灯装置とを一体的に形成した放電灯点灯装置であって、前記交流電源を整流して直流を得る整流器と；前記整流器で得られた直流電圧を昇圧する昇圧回路と；前記昇圧回路で昇圧された電圧を高周波電圧に変換し放電灯を高周波点灯するインバータ回路と；前記整流器で得られた直流電力を非常用電源に充電する非常用電源充電回路と；前記非常時に前記非常用電源の電圧を昇圧する非常用電源昇圧回路と；通常時は前記昇圧回路で昇圧された前記整流器からの直流電圧を高周波電圧に変換し定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には前記非常用電源昇圧回路からの電圧を高周波電圧に変換し定電力で放電灯を調光点灯する非常点灯動作を行う点灯制御部と；を備えたことを特徴とする。 The discharge lamp lighting device according to the invention of claim 1 is a normal lighting device for high-frequency conversion of direct current obtained by rectifying an alternating current power source and rectifying the alternating current power source, and a normal lighting device for normally rectifying the alternating current power source. A discharge lamp lighting device that is integrally formed with an emergency lighting device that charges an emergency power source and emergency discharges the discharge lamp using the emergency power source as a power source in an emergency. A rectifier to be obtained; a booster circuit for boosting a DC voltage obtained by the rectifier; an inverter circuit for converting the voltage boosted by the booster circuit into a high-frequency voltage and lighting a discharge lamp at a high frequency; and a DC obtained by the rectifier An emergency power supply charging circuit for charging power to an emergency power supply; an emergency power supply booster circuit for boosting the voltage of the emergency power supply during the emergency; and a DC voltage from the rectifier boosted by the booster circuit during normal operation Converts to high frequency voltage and performs normal lighting operation of the discharge lamp at high frequency with constant power. In an emergency, converts the voltage from the emergency power supply booster circuit to high frequency voltage and dimmes and discharges the discharge lamp with constant power And a lighting control unit for performing the above.

本発明および以下の発明において、特に指定しない限り用語の定義や技術的意味は以下による。放電灯点灯装置は、通常時は交流電源で放電灯を点灯させる常用点灯装置と、交流電源の停電時には非常用電源で放電灯を点灯させる非常用点灯装置とを、一部の構成回路を共用して一体的に形成したものである。 In the present invention and the following inventions, terms and technical meanings are as follows unless otherwise specified. The discharge lamp lighting device shares a part of the configuration of the regular lighting device that normally lights the discharge lamp with an AC power source and the emergency lighting device that lights the discharge lamp with the emergency power source when the AC power supply fails And formed integrally.

常用点灯装置は、少なくとも、交流電源を整流して直流を得る整流器と、整流器で得られた直流電圧を昇圧する昇圧回路と、昇圧回路で昇圧された電圧を高周波電圧に変換し放電灯を高周波点灯するインバータ回路とを有し、非常用点灯装置は、少なくとも、整流器で得られた直流電力を非常用電源に充電する非常用電源充電回路と、非常時に非常用電源の電圧を昇圧して昇圧回路の前段に出力する非常用電源昇圧回路とを有する。 The regular lighting device includes at least a rectifier that rectifies an AC power source to obtain DC, a booster circuit that boosts the DC voltage obtained by the rectifier, and converts the voltage boosted by the booster circuit into a high-frequency voltage to make the discharge lamp a high-frequency The emergency lighting device has at least an emergency power supply charging circuit for charging the emergency power supply with the DC power obtained by the rectifier, and boosts the voltage of the emergency power supply in an emergency. And an emergency power boosting circuit that outputs to the previous stage of the circuit.

常用点灯装置の整流器で得られた直流電力を非常用点灯装置の非常用電源に充電することから、非常用点灯装置では直流電力を得る整流器を共用している。また、非常時においてはインバータ回路を用いて非常点灯動作を行うことになり、インバータ回路を共用している。従って、回路構成を簡素化できる。 Since the DC power obtained by the rectifier of the regular lighting device is charged to the emergency power source of the emergency lighting device, the emergency lighting device shares a rectifier that obtains DC power. In an emergency, an emergency lighting operation is performed using an inverter circuit, and the inverter circuit is shared. Therefore, the circuit configuration can be simplified.

点灯制御部は、共用された常用点灯装置のインバータ回路を制御する。通常時の通常点灯動作は、昇圧回路で昇圧された整流器からの直流電圧を高周波電圧に変換し、定電力で放電灯を高周波点灯する。一方、非常時の非常点灯動作には、非常用電源昇圧回路からの電圧を必要に応じて昇圧回路で昇圧して高周波電圧に変換し定電力で放電灯を調光点灯する。非常時の調光制御機能は、例えば非常用電源昇圧回路の出力電圧をインバータ回路に出力する部分に設け、インバータ回路への印加電圧を調整することにより調光制御する。 The lighting control unit controls the inverter circuit of the common service lighting device. In the normal lighting operation, the DC voltage from the rectifier boosted by the booster circuit is converted into a high frequency voltage, and the discharge lamp is turned on at a high frequency with constant power. On the other hand, in the emergency lighting operation in an emergency, the voltage from the emergency power supply booster circuit is boosted by the booster circuit as necessary and converted to a high frequency voltage, and the discharge lamp is dimmed with constant power. The dimming control function at the time of emergency is, for example, provided in a portion that outputs the output voltage of the emergency power supply booster circuit to the inverter circuit, and performs dimming control by adjusting the voltage applied to the inverter circuit.

請求項２の発明に係わる放電灯点灯装置は、通常時は交流電源を整流して得られた直流を高周波変換し放電灯を高周波点灯する常用点灯装置と、通常時は交流電源を整流して非常用電源を充電するとともに非常時は非常用電源を電源として放電灯を非常点灯させる非常用点灯装置とを一体的に形成した放電灯点灯装置であって、前記交流電源を整流して直流を得る整流器と；前記整流器で得られた直流電圧を昇圧する昇圧回路と；前記昇圧回路で昇圧された電圧を高周波電圧に変換し放電灯を高周波点灯するインバータ回路と；前記整流器で得られた直流電力を非常用電源に充電する非常用電源充電回路と；前記非常時に前記非常用電源の電圧を昇圧する非常用電源昇圧回路と；通常時は前記昇圧回路で昇圧された前記整流器からの直流電圧を高周波電圧に変換し定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には前記非常用電源昇圧回路からの電圧を高周波電圧に変換し定電流で放電灯を調光点灯する非常点灯動作を行う点灯制御部と；を備えたことを特徴とする。 The discharge lamp lighting device according to the invention of claim 2 is a normal lighting device for high-frequency conversion of direct current obtained by rectifying an alternating current power source and converting a direct current obtained by rectifying the alternating current power source, and a normal current rectifying AC power source. A discharge lamp lighting device that is integrally formed with an emergency lighting device that charges an emergency power source and emergency discharges the discharge lamp using the emergency power source as a power source in an emergency. A rectifier to be obtained; a booster circuit for boosting a DC voltage obtained by the rectifier; an inverter circuit for converting the voltage boosted by the booster circuit into a high-frequency voltage and lighting a discharge lamp at a high frequency; and a DC obtained by the rectifier An emergency power supply charging circuit for charging power to an emergency power supply; an emergency power supply booster circuit for boosting the voltage of the emergency power supply during the emergency; and a DC voltage from the rectifier boosted by the booster circuit during normal operation Converts to high frequency voltage and performs normal lighting operation of the discharge lamp at high frequency with constant power. In emergency, converts the voltage from the emergency power booster circuit to high frequency voltage and dimmes the discharge lamp with constant current. And a lighting control unit for performing the above.

本発明は、通常時は定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には前記非常用電源昇圧回路からの電圧を高周波電圧に変換し定電流で放電灯を調光点灯するようにしたものである。 The present invention performs a normal lighting operation in which the discharge lamp is lit at a high frequency with a constant power during a normal time, and dimming the discharge lamp with a constant current by converting the voltage from the emergency power supply booster circuit into a high frequency voltage in an emergency. It is a thing.

一般に、放電灯の温度が１２０℃を超えるとランプ電圧は急激に上昇する。この場合、常用点灯装置が放電灯を定電力で点灯制御している場合には、ランプ電圧の上昇に伴いランプ電流が減少し、放電灯が立ち消えしてしまうことがある。例えば、周囲温度が所定温度以上となるとランプ電圧が所定電圧以上となり、ランプ電流が減少して放電灯が立ち消えしてしまう。このように、火事等で放電灯が高温となったときに、非常用電源から電源が供給されていても放電灯が消灯してしまうことがある。そこで、点灯制御部は、非常時には放電灯のランプ電流を一定に維持し、放電灯の温度が高温になっても放電灯が立ち消えとならないようにする。 In general, when the temperature of the discharge lamp exceeds 120 ° C., the lamp voltage increases rapidly. In this case, when the regular lighting device controls the discharge lamp to be lit with constant power, the lamp current may decrease as the lamp voltage increases, and the discharge lamp may go out. For example, when the ambient temperature becomes equal to or higher than a predetermined temperature, the lamp voltage becomes equal to or higher than the predetermined voltage, the lamp current decreases, and the discharge lamp goes out. As described above, when the discharge lamp becomes hot due to a fire or the like, the discharge lamp may be turned off even when power is supplied from the emergency power supply. Therefore, the lighting control unit keeps the lamp current of the discharge lamp constant in an emergency so that the discharge lamp does not go out even when the temperature of the discharge lamp becomes high.

請求項３の発明に係わる放電灯点灯装置は、請求項１または２の発明において、前記点灯制御部は、放電灯の温度または周囲温度が所定温度以下では定電力で放電灯を高周波点灯し、所定温度を超えると定電流で放電灯を点灯する非常点灯動作を行うことを特徴とする
本発明は、非常時には放電灯の温度を監視し、放電灯の温度が所定温度以下では定電力で放電灯を高周波点灯し、所定温度を超えると定電流で放電灯を点灯するようにしたものである。 A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the first or second aspect of the present invention, wherein the lighting control unit performs high-frequency lighting of the discharge lamp with a constant power when the temperature of the discharge lamp or the ambient temperature is equal to or lower than a predetermined temperature. The present invention is characterized by performing an emergency lighting operation of lighting a discharge lamp with a constant current when a predetermined temperature is exceeded. The present invention monitors the temperature of the discharge lamp in an emergency, and discharges it with a constant power when the temperature of the discharge lamp is lower than a predetermined temperature. The electric lamp is turned on at a high frequency, and when the temperature exceeds a predetermined temperature, the discharge lamp is turned on with a constant current.

定電力で放電灯を点灯制御する場合、放電灯の温度が上昇すると放電灯のランプ電圧が上昇しランプ電流が減少するが、放電灯の立ち消えが起こらない所定温度までは、定電力制御により放電灯を点灯制御する。これにより、放電灯の負荷特性が定電力特性となり、複数定格の放電灯についてインバータ回路を共用できる。そして、放電灯の立ち消えが起こると予想される所定温度以上となると、定電流により放電灯を点灯制御する。 When controlling the discharge lamp with constant power, if the discharge lamp temperature rises, the lamp voltage of the discharge lamp rises and the lamp current decreases, but the discharge is controlled by constant power control until a predetermined temperature at which the discharge lamp does not go out. Controls lighting of the light. Thereby, the load characteristic of the discharge lamp becomes a constant power characteristic, and the inverter circuit can be shared for the discharge lamps of multiple ratings. Then, when the temperature exceeds a predetermined temperature at which the discharge lamp is expected to disappear, the discharge lamp is controlled to be turned on with a constant current.

請求項４の発明に係わる放電灯点灯装置は、請求項３の発明において、前記点灯制御部は、放電灯の温度が所定温度を超えたか否かを放電灯のランプ電圧で判定することを特徴とする。 According to a fourth aspect of the present invention, there is provided the discharge lamp lighting device according to the third aspect, wherein the lighting control unit determines whether or not the temperature of the discharge lamp exceeds a predetermined temperature based on a lamp voltage of the discharge lamp. And

放電灯の温度は放電灯のランプ電圧で表されることから、放電灯のランプ電圧を検出し、ランプ電圧を監視することにより放電灯の温度を判定するようにしたものである。 Since the temperature of the discharge lamp is expressed by the lamp voltage of the discharge lamp, the lamp voltage of the discharge lamp is detected and the temperature of the discharge lamp is determined by monitoring the lamp voltage.

請求項１の発明によれば、放電灯を高周波点灯するインバータ回路を共用し、通常時は定電力で放電灯を高周波点灯し、非常時には定電力で放電灯を調光点灯するので、非常時において放電灯の光束が低下することがない。また、非常において調光制御するので放電灯の非常点灯を長くすることができる。 According to the first aspect of the present invention, the inverter circuit for high-frequency lighting of the discharge lamp is shared, the high-frequency lighting of the discharge lamp with constant power is performed normally, and the discharge lamp is dimmed with constant power in an emergency. In this case, the luminous flux of the discharge lamp does not decrease. In addition, since dimming control is performed in an emergency, the emergency lighting of the discharge lamp can be lengthened.

請求項２の発明によれば、放電灯を高周波点灯するインバータ回路を共用し、通常時は定電力で放電灯を高周波点灯し、非常時には定電流で放電灯を高周波点灯するので、放電灯が温度上昇しても非常用電源からの電源供給がある限りは放電灯の点灯を維持できる。 According to the invention of claim 2, since the inverter circuit for high-frequency lighting of the discharge lamp is shared, the discharge lamp is high-frequency lighted with a constant power during normal times, and the discharge lamp is high-frequency lighted with a constant current in an emergency. Even if the temperature rises, as long as power is supplied from the emergency power supply, the discharge lamp can be kept on.

請求項３または４の発明によれば、通常時は定電力で放電灯を高周波点灯し、非常時には放電灯の温度が所定温度以下では定電力で放電灯を点灯し、所定温度を超えると定電流で放電灯を点灯するので、非常時に放電灯が消灯してしまうことがない。 According to the third or fourth aspect of the invention, the discharge lamp is lit at a high frequency with a constant power during normal times, and the discharge lamp is lit with a constant power when the temperature of the discharge lamp is lower than a predetermined temperature in an emergency. Since the discharge lamp is turned on with an electric current, the discharge lamp does not turn off in an emergency.

（第１の実施の形態）
図１は本発明の第１の実施の形態に係わる放電灯点灯装置の回路構成図である。交流電源１１は放電灯点灯装置の雑防回路１２を介して整流器１３に入力される。整流回路１３で整流された直流電圧は昇圧回路１４で昇圧され、インバータ回路１５に入力される。インバータ回路１５は昇圧回路１４で昇圧された電圧を高周波電圧に変換し、負荷回路１６の放電灯１７に供給し高周波点灯する。 (First embodiment)
FIG. 1 is a circuit configuration diagram of a discharge lamp lighting device according to a first embodiment of the present invention. The AC power supply 11 is input to the rectifier 13 via the noise prevention circuit 12 of the discharge lamp lighting device. The DC voltage rectified by the rectifier circuit 13 is boosted by the booster circuit 14 and input to the inverter circuit 15. The inverter circuit 15 converts the voltage boosted by the booster circuit 14 into a high frequency voltage and supplies the high frequency voltage to the discharge lamp 17 of the load circuit 16 so that the high frequency lighting is performed.

一方、整流器１３で得られた直流は非常用電源充電回路１８に入力され、電源監視回路１９により交流電源１１が正常であるか否かが判定される。すなわち、整流器１３で整流され得られた直流電圧が正常であるか否かを判定することにより、交流電源１１が正常であるか否かが判定される。交流電源１１が正常であるときは充電回路２０は、整流器１３で得られた直流を非常用電源２１に充電する。また、非常用電源昇圧回路２２は交流電源１１の喪失等の非常時に非常用電源２１の電圧を昇圧して昇圧回路１４の前段に出力するように接続されている。 On the other hand, the direct current obtained by the rectifier 13 is input to the emergency power supply charging circuit 18 and the power supply monitoring circuit 19 determines whether or not the alternating current power supply 11 is normal. That is, whether or not the AC power supply 11 is normal is determined by determining whether or not the DC voltage rectified by the rectifier 13 is normal. When the AC power supply 11 is normal, the charging circuit 20 charges the emergency power supply 21 with the direct current obtained by the rectifier 13. The emergency power supply booster circuit 22 is connected to boost the voltage of the emergency power supply 21 and output it to the preceding stage of the booster circuit 14 in the event of an emergency such as the loss of the AC power supply 11.

雑防回路１２、整流器１３、昇圧回路１４、インバータ回路１５、負荷回路１６により、放電灯１７の通常点灯動作を行う常用点灯装置を形成しており、雑防回路１２、整流器１３、非常用電源充電回路１８、非常用電源昇圧回路２２により、放電灯１７の非常点灯動作を行う非常用点灯装置を形成している。雑防回路１２および整流器１３は、常用点灯装置と非常用点灯装置とで共用している。また、非常用電源昇圧回路２２の出力を昇圧回路１４の前段に接続し、非常時においても、昇圧回路１４、インバータ回路１５、負荷回路１６を使用して放電灯１７を非常時点灯動作させる。従って、昇圧回路１４、インバータ回路１５、負荷回路１６も共用している。しかも、これらは一体的に形成されている。 The miscellaneous circuit 12, the rectifier 13, the booster circuit 14, the inverter circuit 15, and the load circuit 16 form a regular lighting device that performs the normal lighting operation of the discharge lamp 17. The miscellaneous circuit 12, the rectifier 13, and the emergency power supply An emergency lighting device that performs an emergency lighting operation of the discharge lamp 17 is formed by the charging circuit 18 and the emergency power boosting circuit 22. The miscellaneous circuit 12 and the rectifier 13 are shared by the regular lighting device and the emergency lighting device. Further, the output of the emergency power supply booster circuit 22 is connected to the previous stage of the booster circuit 14, and the discharge lamp 17 is lit in an emergency using the booster circuit 14, the inverter circuit 15, and the load circuit 16 even in an emergency. Therefore, the booster circuit 14, the inverter circuit 15, and the load circuit 16 are also shared. Moreover, they are integrally formed.

なお、図１では放電灯１７が１個である場合について示しているが、放電灯が２個である２灯用の放電灯点灯装置にも適用できる。以下の説明では、放電灯１７が１個である１灯用の場合について説明する。 Although FIG. 1 shows the case where there is one discharge lamp 17, it can also be applied to a discharge lamp lighting device for two lamps having two discharge lamps. In the following description, a case of one lamp having one discharge lamp 17 will be described.

壁切りスイッチ部２３はスイッチ２４がオンしたときに導通するフォトダイオード２５を有し、フォトダイオード２５の導通によりフォトトランジスタ２６が動作し点灯制御部２７を動作させる。スイッチ２４をオフしたときはフォトダイオード２５が非導通となるので、フォトトランジスタ２６が不動作となり点灯制御部２７の通常点灯動作が停止する。なお、スイッチ２４がオフであったとしても、雑防回路１２および整流器１３は動作しており、整流回路１３は非常用電源充電回路１８に直流電圧を印加している。従って、スイッチ２４がオフで点灯制御部２７の通常点灯動作が停止状態であり、放電灯１９が消灯していても、非常用電源充電回路１８を動作させて非常用電源１９に充電をすることは可能であり、非常時はスイッチ２４がオフでも非常点灯を行える回路構成である。 The wall-cutting switch unit 23 has a photodiode 25 that is conductive when the switch 24 is turned on, and the phototransistor 26 is operated by the conduction of the photodiode 25 to operate the lighting control unit 27. When the switch 24 is turned off, the photodiode 25 becomes non-conductive, so that the phototransistor 26 does not operate and the normal lighting operation of the lighting control unit 27 stops. Even if the switch 24 is off, the noise prevention circuit 12 and the rectifier 13 are operating, and the rectifier circuit 13 applies a DC voltage to the emergency power supply charging circuit 18. Therefore, even when the switch 24 is off and the normal lighting operation of the lighting control unit 27 is stopped, and the discharge lamp 19 is turned off, the emergency power supply charging circuit 18 is operated to charge the emergency power supply 19. The circuit configuration can perform emergency lighting even when the switch 24 is turned off.

次に、点灯制御部２７には、フォトトランジスタ２６の動作や不動作に加え、非常用電源充電回路１８の電源監視回路１９の出力信号も入力される。非常用電源充電回路１８の電源監視回路１９は、交流電源１１の電圧が正常範囲を逸脱したか否かを監視するとともに、交流電源１１の電圧が所定値以下か否かを監視し、非常点灯動作への切り替えが必要であるか否かを判定する。 Next, in addition to the operation and non-operation of the phototransistor 26, the output signal of the power supply monitoring circuit 19 of the emergency power supply charging circuit 18 is also input to the lighting control unit 27. The power supply monitoring circuit 19 of the emergency power supply charging circuit 18 monitors whether or not the voltage of the AC power supply 11 has deviated from the normal range, monitors whether or not the voltage of the AC power supply 11 is equal to or lower than a predetermined value, and performs emergency lighting. It is determined whether switching to operation is necessary.

昇圧回路１４は昇圧制御部２８によりスイッチ素子２９をオンオフ制御して入力電圧を昇圧する昇圧チョッパ回路であり、非常時調光回路３０を備えている。非常時調光回路３０のスイッチ素子Ｑ１は点灯制御部２７からの指令でオンオフ制御される。非常用電源昇圧回路２２は点灯制御部２７からの指令で動作する。 The booster circuit 14 is a booster chopper circuit that boosts an input voltage by controlling the switch element 29 on and off by the booster control unit 28, and includes an emergency light control circuit 30. The switch element Q1 of the emergency light control circuit 30 is on / off controlled by a command from the lighting control unit 27. The emergency power boosting circuit 22 operates in response to a command from the lighting control unit 27.

次に、点灯制御部２７は、壁切りスイッチ部２３のスイッチ２４がオンであり、交流電源１１の電圧が正常範囲内であるときは、非常時調光回路３０のスイッチ素子Ｑ１をオンするとともに、非常用電源昇圧回路２２の動作をロックする。そして、スイッチ素子３１ａ、３１ｂをオンオフ制御して、昇圧回路１４で昇圧された整流器１３からの直流電圧を高周波電圧に変換し、定電力で放電灯１７を高周波点灯する通常点灯動作を行う。すなわち、点灯制御部２７は定電力制御部３２によりインバータ回路１５の出力が定電力になるように、スイッチ素子３１ａ、３１ｂをオンオフ制御する。従って、通常時の放電灯１７の通常点灯状態では定電力特性を持った負荷特性となる。 Next, the lighting control unit 27 turns on the switch element Q1 of the emergency dimming circuit 30 when the switch 24 of the wall-cutting switch unit 23 is on and the voltage of the AC power supply 11 is within the normal range. The operation of the emergency power boosting circuit 22 is locked. Then, the switching elements 31a and 31b are turned on / off to convert the DC voltage from the rectifier 13 boosted by the booster circuit 14 into a high frequency voltage, and a normal lighting operation is performed in which the discharge lamp 17 is lighted at a high frequency with constant power. That is, the lighting control unit 27 performs on / off control of the switch elements 31a and 31b so that the output of the inverter circuit 15 becomes constant power by the constant power control unit 32. Therefore, in the normal lighting state of the discharge lamp 17 at normal time, the load characteristic has a constant power characteristic.

一方、点灯制御部２７は、電源監視回路１９から交流電源１１の電圧が正常範囲を逸脱したことを入力すると、インバータ回路１５のスイッチ素子３１ａ、３１ｂのオンオフ動作（発振動作）を停止する。 On the other hand, when the lighting control unit 27 inputs from the power supply monitoring circuit 19 that the voltage of the AC power supply 11 has deviated from the normal range, the lighting control unit 27 stops the on / off operation (oscillation operation) of the switch elements 31a and 31b of the inverter circuit 15.

図２は電源監視回路１９の動作特性の説明図である。電源監視回路１９は交流電源１１の電圧を監視しており、交流電源１１の電圧がしきい値Ｖ１以上であるときは正常範囲内である判断する。この場合、点灯制御部２７は放電灯１７を交流電源１１からの電力で点灯する（ＡＣ点灯）。そして、交流電源１１の電圧がしきい値Ｖ１未満となると、電源監視回路１９は交流電源１１の電圧が正常範囲を逸脱した判断する。点灯制御部２７は発振動作を停止し放電灯１７を不点灯状態とする（不点灯）。さらに、交流電源１１の電圧が所定値Ｖ２以下となると、電源監視回路１９は非常点灯動作を開始すべき状態であると判断すると、点灯制御部２７の動作を停止状態から非常点灯動作に切り替える。 FIG. 2 is an explanatory diagram of the operating characteristics of the power supply monitoring circuit 19. The power supply monitoring circuit 19 monitors the voltage of the AC power supply 11 and determines that the voltage is within the normal range when the voltage of the AC power supply 11 is equal to or higher than the threshold value V1. In this case, the lighting control unit 27 lights the discharge lamp 17 with power from the AC power supply 11 (AC lighting). When the voltage of the AC power supply 11 becomes less than the threshold value V1, the power supply monitoring circuit 19 determines that the voltage of the AC power supply 11 has deviated from the normal range. The lighting control unit 27 stops the oscillation operation and puts the discharge lamp 17 into a non-lighting state (non-lighting). Further, when the voltage of the AC power supply 11 becomes equal to or lower than the predetermined value V2, the power supply monitoring circuit 19 switches the operation of the lighting control unit 27 from the stopped state to the emergency lighting operation when determining that the emergency lighting operation should be started.

ここで、通常点灯動作（ＡＣ点灯）と非常点灯動作（ＤＣ点灯）との間で、不点灯状態を持たせているのは、交流電源１１の電圧が通常点灯動作と非常点灯動作との境界で変動したときに、通常点灯動作と非常点灯動作とが頻繁に切り替わることを避けるためである。 Here, the non-lighting state is given between the normal lighting operation (AC lighting) and the emergency lighting operation (DC lighting) because the voltage of the AC power supply 11 is the boundary between the normal lighting operation and the emergency lighting operation. This is for avoiding frequent switching between the normal lighting operation and the emergency lighting operation when the value fluctuates.

また、点灯制御部２７は、電源監視回路１９から非常点灯動作すべき状態信号を入力すると、非常時調光回路３０のスイッチ素子Ｑ１をオフとするとともに非常用電源昇圧回路２２を動作させる。非常時調光回路３０のスイッチ素子Ｑ１をオフにより、非常時調光回路３０が有効となり調光制御が行われる。すなわち、昇圧回路１４の昇圧制御部２８の目標電圧が分圧抵抗の追加により低く設定されるので、昇圧回路１４の出力電圧が低くなる。 In addition, when the lighting control unit 27 receives a state signal for an emergency lighting operation from the power supply monitoring circuit 19, the lighting control unit 27 turns off the switch element Q <b> 1 of the emergency light control circuit 30 and operates the emergency power boosting circuit 22. When the switch element Q1 of the emergency dimming circuit 30 is turned off, the emergency dimming circuit 30 becomes effective and dimming control is performed. That is, since the target voltage of the boost control unit 28 of the booster circuit 14 is set low by adding a voltage dividing resistor, the output voltage of the booster circuit 14 is lowered.

また、非常用電源昇圧回路２２の動作により、非常用電源昇圧回路２２からの電圧が昇圧回路１４の前段に入力され、昇圧回路１４により所定電圧に昇圧される。この場合、昇圧回路１４に入力される非常用電源昇圧回路２２の出力電圧が変動したとしても、昇圧回路１４で所定値に昇圧されるので、昇圧回路に出力電圧はほぼ一定となり、インバータ回路１５に入力される電圧はほぼ一定となる。 Further, by the operation of the emergency power supply booster circuit 22, the voltage from the emergency power supply booster circuit 22 is input to the previous stage of the booster circuit 14 and boosted to a predetermined voltage by the booster circuit 14. In this case, even if the output voltage of the emergency power supply booster circuit 22 input to the booster circuit 14 fluctuates, the booster circuit 14 boosts the voltage to a predetermined value, so that the output voltage in the booster circuit becomes substantially constant, and the inverter circuit 15 The voltage input to is substantially constant.

点灯制御部２７は、定電力制御部３２によりインバータ回路１５の出力が定電力になるように、スイッチ素子３１ａ、３１ｂをオンオフ制御するので、非常時の放電灯１７の非常点灯動作に対しても同様に定電力特性を持った負荷特性となる。インバータ回路１５の入力電圧はほぼ一定であるので、放電灯１７の光束をほぼ一定に保つことができ、建家の床面の照度をほぼ一定に保つことができる。 Since the lighting control unit 27 performs on / off control of the switch elements 31 a and 31 b so that the output of the inverter circuit 15 becomes constant power by the constant power control unit 32, the lighting control unit 27 also responds to an emergency lighting operation of the discharge lamp 17 in an emergency. Similarly, the load characteristic has a constant power characteristic. Since the input voltage of the inverter circuit 15 is substantially constant, the luminous flux of the discharge lamp 17 can be kept almost constant, and the illuminance on the floor surface of the building can be kept almost constant.

第１の実施の形態によれば、通常点灯時と非常点灯時とで放電灯を高周波点灯するインバータ回路を共用するので、回路構成を簡素化できる。また、通常時は定電力で放電灯を高周波点灯し、非常時には定電力で放電灯を調光点灯するので、一定の光束となるように放電灯を点灯できる。また、非常時には調光点灯するので放電灯を長時間に亘って非常点灯できる。 According to the first embodiment, since the inverter circuit for high-frequency lighting of the discharge lamp is shared between normal lighting and emergency lighting, the circuit configuration can be simplified. In addition, the discharge lamp is lit at a high frequency with a constant power during normal times, and the discharge lamp is dimmed with a constant power during an emergency, so that the discharge lamp can be lit so as to have a constant luminous flux. Further, since the light is lit in an emergency, the discharge lamp can be lit for a long time.

（第２の実施の形態）
図３は本発明の第２の実施の形態に係わる放電灯点灯装置の回路構成図である。この第２の実施の形態は、図１に示した第１の実施の形態に対し、非常時には定電力制御部３２の動作をロックするためのトランジスタＱ１、Ｑ２を設け、通常時は定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には定電流で放電灯を調光点灯する非常点灯動作を行うようにしたものである。図１と同一要素には同一符号を付し重複する説明は省略する。 (Second Embodiment)
FIG. 3 is a circuit configuration diagram of a discharge lamp lighting device according to the second embodiment of the present invention. This second embodiment is different from the first embodiment shown in FIG. 1 in that transistors Q1 and Q2 for locking the operation of the constant power control unit 32 are provided in an emergency, and at a constant power at a normal time. A normal lighting operation for high-frequency lighting of the discharge lamp is performed, and in an emergency, an emergency lighting operation for dimming and lighting the discharge lamp with a constant current is performed. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

図３において、定電力制御部３２の動作をロックするトランジスタＱ１、Ｑ２が設けられ、非常時にはこのトランジスタＱ２、Ｑ３が導通する。すなわち、電源監視回路１９は非常点灯動作を開始すべき状態であると判断すると、点灯制御部２７の動作を停止状態から非常点灯動作に切り替えるとともに、トランジスタＱ２、Ｑ３を導通し定電力制御部３２の動作をロックする。定電力制御部３２の動作のロックにより、点灯制御部２７の動作周波数が固定され、点灯制御部２７の点灯制御は、定電力による点灯制御に代えて定電流による点灯制御となる。例えば、点灯制御部２７の動作周波数は無負荷時共振周波数に設定され、定電流による点灯制御となる。 In FIG. 3, transistors Q1 and Q2 that lock the operation of the constant power control unit 32 are provided, and the transistors Q2 and Q3 are turned on in an emergency. That is, when the power supply monitoring circuit 19 determines that the emergency lighting operation should be started, the operation of the lighting control unit 27 is switched from the stopped state to the emergency lighting operation, and the transistors Q2 and Q3 are turned on to make the constant power control unit 32 operate. Lock the operation. The operation frequency of the lighting control unit 27 is fixed by locking the operation of the constant power control unit 32, and the lighting control of the lighting control unit 27 is lighting control by constant current instead of lighting control by constant power. For example, the operating frequency of the lighting control unit 27 is set to a no-load resonance frequency, and lighting control is performed with a constant current.

このように、非常時となったときは、トランジスタＱ２、Ｑ３を導通させ定電力制御部３２の動作をロックする。この定電力制御部３２の動作のロックにより、点灯制御部２７の動作周波数が例えば無負荷時共振周波数に固定され、点灯制御部２７の点灯制御は、定電力による点灯制御に代えて定電流による点灯制御となる。従って、ランプ電流の減少を防止できるので、放電灯１７が立ち消えすることがなくなる。 Thus, when an emergency occurs, the transistors Q2 and Q3 are turned on to lock the operation of the constant power control unit 32. Due to the locking of the operation of the constant power control unit 32, the operating frequency of the lighting control unit 27 is fixed at, for example, a no-load resonance frequency, and the lighting control of the lighting control unit 27 is performed by a constant current instead of the lighting control by the constant power. It becomes lighting control. Therefore, since the reduction of the lamp current can be prevented, the discharge lamp 17 does not disappear.

第２の実施の形態によれば、通常点灯時と非常点灯時とで放電灯を高周波点灯するインバータ回路を共用するので、回路構成を簡素化できる。また、通常時は定電力で放電灯を高周波点灯し、非常時には定電流で放電灯を高周波点灯するので、放電灯が高温となりランプ電圧が上昇しても一定のランプ電流を非常用電源から供給でき放電灯の点灯を維持できる。従って、放電灯が高温になっても立ち消えを防止できる。 According to the second embodiment, since the inverter circuit for high-frequency lighting of the discharge lamp is shared between normal lighting and emergency lighting, the circuit configuration can be simplified. In addition, the discharge lamp is operated at a high frequency with a constant power during normal times, and the discharge lamp is operated at a high frequency with a constant current in an emergency, so that a constant lamp current is supplied from the emergency power supply even if the discharge lamp becomes hot and the lamp voltage rises. The discharge lamp can be kept on. Therefore, even if the discharge lamp becomes high temperature, it can be prevented from disappearing.

（第３の実施の形態）
図４は本発明の第３の実施の形態に係わる放電灯点灯装置の回路構成図である。この第３の実施の形態は、図３に示した第２の実施の形態に対し、周囲温度を判定する温度検出手段３３を設け、放電灯１７の温度が所定温度以下では定電力で高周波点灯し、所定温度を超えると定電流で調光点灯するようにしたものである。図３と同一要素には、同一符号を付し重複する説明は省略する。 (Third embodiment)
FIG. 4 is a circuit configuration diagram of a discharge lamp lighting device according to the third embodiment of the present invention. This third embodiment is provided with temperature detecting means 33 for determining the ambient temperature, compared with the second embodiment shown in FIG. 3, and when the temperature of the discharge lamp 17 is lower than a predetermined temperature, it is operated at high frequency with constant power. When the temperature exceeds a predetermined temperature, dimming is performed with a constant current. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

温度検出手段３３は、例えば非常用電源昇圧回路２２の近傍に設けられ、放電灯点灯装置（放電灯）の周囲温度を検出し点灯制御部２７に出力する。点灯制御部２７は温度検出手段３３で検出された温度が所定温度を超えているかどうかを判定する。放電灯１７の温度が所定値を超えるとランプ電圧は急激に上昇し、常用点灯動作により放電灯１７を定電力で点灯制御している場合には、ランプ電圧の上昇に伴いランプ電流が減少し、放電灯が立ち消えしてしまうことがある。そこで、放電灯の周囲温度が所定温度を超えると定電流で調光点灯する。 The temperature detection means 33 is provided, for example, in the vicinity of the emergency power supply booster circuit 22, detects the ambient temperature of the discharge lamp lighting device (discharge lamp), and outputs it to the lighting control unit 27. The lighting control unit 27 determines whether or not the temperature detected by the temperature detection unit 33 exceeds a predetermined temperature. When the temperature of the discharge lamp 17 exceeds a predetermined value, the lamp voltage rapidly rises. When the discharge lamp 17 is controlled to be lit at a constant power by the regular lighting operation, the lamp current decreases as the lamp voltage increases. The discharge lamp may go out. Therefore, when the ambient temperature of the discharge lamp exceeds a predetermined temperature, dimming is performed with a constant current.

図５は放電灯のランプ電圧と温度との関係を示す特性曲線である。放電灯の温度が１２０℃を超えるとランプ電圧は急激に上昇する。この場合、常用点灯装置が放電灯を定電力で点灯制御している場合には、ランプ電圧の上昇に伴いランプ電流が減少し、放電灯が立ち消えしてしまうことがある。例えば、温度がＴ０以上となるとランプ電圧がＶ０以上となり、ランプ電流が減少して放電灯が立ち消えしてしまう。このように、火事等で放電灯が高温となったときに、非常用電源から電源が供給されていても放電灯が消灯してしまうことがある。 FIG. 5 is a characteristic curve showing the relationship between the lamp voltage and the temperature of the discharge lamp. When the temperature of the discharge lamp exceeds 120 ° C., the lamp voltage increases rapidly. In this case, when the regular lighting device controls the discharge lamp to be lit with constant power, the lamp current may decrease as the lamp voltage increases, and the discharge lamp may go out. For example, when the temperature becomes T0 or higher, the lamp voltage becomes V0 or higher, the lamp current decreases, and the discharge lamp goes out. As described above, when the discharge lamp becomes hot due to a fire or the like, the discharge lamp may be turned off even when power is supplied from the emergency power supply.

そこで、点灯制御部２７は温度検出手段３３で検出された温度検出信号を入力し、周囲温度が放電灯１７の立ち消えの起こらない所定温度未満であるときは、電源監視回路１９によるトランジスタＱ２、Ｑ３の導通を阻止し、定電力により放電灯を点灯制御する。一方、放電灯１７が立ち消えする所定温度以上となったときは、点灯制御部２７は電源監視回路１９によるトランジスタＱ２、Ｑ３の導通を許可し、定電流により放電灯を点灯制御する。従って、ランプ電流の減少を防止できるので、放電灯１７が立ち消えすることがなくなる。 Therefore, the lighting control unit 27 inputs the temperature detection signal detected by the temperature detection means 33, and when the ambient temperature is lower than a predetermined temperature at which the discharge lamp 17 does not disappear, the transistors Q2, Q3 by the power supply monitoring circuit 19 are used. And the lighting of the discharge lamp is controlled with constant power. On the other hand, when the temperature exceeds a predetermined temperature at which the discharge lamp 17 goes off, the lighting control unit 27 allows the transistors Q2 and Q3 to be turned on by the power supply monitoring circuit 19, and controls the lighting of the discharge lamp with a constant current. Therefore, since the reduction of the lamp current can be prevented, the discharge lamp 17 does not disappear.

所定温度を超えた場合の定電流制御の電流値については、立ち消えしない程度の最低電流値とする。もしくは、周囲温度が１４０℃以上であっても所定の照度を維持できる電流値をする。 The current value of constant current control when the temperature exceeds a predetermined temperature is set to a minimum current value that does not disappear. Alternatively, a current value that can maintain a predetermined illuminance even when the ambient temperature is 140 ° C. or higher is used.

以上の説明では、温度検出手段３３を非常用電源昇圧回路２２の近傍に設けたが、放電灯１７の近傍に設けて直接的に放電灯１７の温度を検出するようにしてもよい。 In the above description, the temperature detecting means 33 is provided in the vicinity of the emergency power supply booster circuit 22, but it may be provided in the vicinity of the discharge lamp 17 to directly detect the temperature of the discharge lamp 17.

第３の実施の形態によれば、非常点灯時には、放電灯１７の立ち消えが起こらない所定温度までは定電力により放電灯１７を点灯制御するので、放電灯１７の負荷特性が定電力特性となり、複数定格の放電灯についてインバータ回路を共用できる。また、放電灯の立ち消えが起こると予想される所定温度以上となると定電流により放電灯を点灯制御するので、放電灯１７が立ち消えすることを防止できる。 According to the third embodiment, at the time of emergency lighting, since the discharge lamp 17 is controlled to be lighted with constant power until a predetermined temperature at which the discharge lamp 17 does not disappear, the load characteristics of the discharge lamp 17 become constant power characteristics. The inverter circuit can be shared for discharge lamps with multiple ratings. Further, since the discharge lamp is controlled to be turned on by a constant current when the temperature exceeds a predetermined temperature at which the discharge lamp is expected to disappear, it is possible to prevent the discharge lamp 17 from going out.

（第４の実施の形態）
図６は本発明の第４の実施の形態に係わる放電灯点灯装置の回路構成図である。この第４の実施の形態は、図４に示した第３の実施の形態に対し、周囲温度を判定する温度検出手段３３に代えてランプ異常電圧検出回路３４を設け、放電灯の温度が所定温度を超えたか否かを放電灯のランプ電圧で判定するようにしたものである。図４と同一要素には、同一符号を付し重複する説明は省略する。 (Fourth embodiment)
FIG. 6 is a circuit configuration diagram of a discharge lamp lighting device according to the fourth embodiment of the present invention. The fourth embodiment is different from the third embodiment shown in FIG. 4 in that a lamp abnormal voltage detection circuit 34 is provided instead of the temperature detection means 33 for determining the ambient temperature, and the temperature of the discharge lamp is predetermined. Whether or not the temperature has been exceeded is determined by the lamp voltage of the discharge lamp. The same elements as those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

ランプ異常電圧検出回路３４は放電灯１７のランプ異常電圧を検出し、点灯制御部２７に入力される。通常運転時においては、点灯制御部２７は放電灯１７の異常電圧を入力すると、インバータ回路１５のスイッチ素子３１ａ、３１ｂの発振を停止する。これにより装置を保護する。 The lamp abnormal voltage detection circuit 34 detects the lamp abnormal voltage of the discharge lamp 17 and inputs it to the lighting control unit 27. During normal operation, when the lighting control unit 27 inputs an abnormal voltage of the discharge lamp 17, the lighting of the switch elements 31a and 31b of the inverter circuit 15 is stopped. This protects the device.

非常運転時においては、放電灯１７が立ち消えする異常電圧であるか否かを判定する。放電灯の立ち消えが起こらない異常電圧未満であるときは、電源監視回路１９によるトランジスタＱ２、Ｑ３の導通を阻止し、定電力により放電灯を点灯制御する。一方、放電灯１７が立ち消えする所定温度以上となったときは、点灯制御部２７は電源監視回路１９によるトランジスタＱ２、Ｑ３の導通を許可し、定電流により放電灯を点灯制御する。すなわち、点灯制御部２７の動作周波数が例えば無負荷時共振周波数に固定され、点灯制御部２７の点灯制御は、定電力による点灯制御に代えて定電流による点灯制御となる。従って、ランプ電流の減少を防止できるので、放電灯１７が立ち消えすることがなくなる。 In an emergency operation, it is determined whether or not the discharge lamp 17 has an abnormal voltage that goes off. When the voltage is lower than the abnormal voltage at which the discharge lamp does not go out, the power supply monitoring circuit 19 prevents the transistors Q2 and Q3 from being turned on, and the lighting of the discharge lamp is controlled with constant power. On the other hand, when the temperature exceeds a predetermined temperature at which the discharge lamp 17 goes off, the lighting control unit 27 allows the transistors Q2 and Q3 to be turned on by the power supply monitoring circuit 19, and controls the lighting of the discharge lamp with a constant current. That is, the operating frequency of the lighting control unit 27 is fixed at, for example, a no-load resonance frequency, and the lighting control of the lighting control unit 27 is lighting control with a constant current instead of lighting control with constant power. Therefore, since the reduction of the lamp current can be prevented, the discharge lamp 17 does not disappear.

第４の実施の形態によれば、第３の実施の形態に効果に加え、ランプ電圧の異常を検出するランプ電圧異常回路３４は、通常時のランプ異常電圧の検出に用いられるものであり、そのランプ電圧異常回路３４を温度検出手段としても兼用できるので、温度検出手段を追加して設ける必要がなく、回路構成を簡素化できる。 According to the fourth embodiment, in addition to the effects of the third embodiment, the lamp voltage abnormality circuit 34 that detects the abnormality of the lamp voltage is used for detecting the lamp abnormality voltage at the normal time. Since the lamp voltage abnormality circuit 34 can also be used as a temperature detection means, it is not necessary to additionally provide a temperature detection means, and the circuit configuration can be simplified.

本発明の第１の実施の形態に係わる放電灯点灯装置の回路構成図。The circuit block diagram of the discharge lamp lighting device concerning the 1st Embodiment of this invention. 本発明の第１の実施の形態における電源監視回路の動作特性の説明図。Explanatory drawing of the operating characteristic of the power supply monitoring circuit in the 1st Embodiment of this invention. 本発明の第２の実施の形態における電源監視回路の動作特性の説明図。Explanatory drawing of the operating characteristic of the power supply monitoring circuit in the 2nd Embodiment of this invention. 本発明の第３の実施の形態に係わる放電灯点灯装置の回路構成図。The circuit block diagram of the discharge lamp lighting device concerning the 3rd Embodiment of this invention. 放電灯のランプ電圧と温度との関係を示す特性曲線。A characteristic curve showing the relationship between lamp voltage and temperature of a discharge lamp. 本発明の第４の実施の形態に係わる放電灯点灯装置の回路構成図。The circuit block diagram of the discharge lamp lighting device concerning the 4th Embodiment of this invention.

符号の説明Explanation of symbols

１１…交流電源、１２…雑防回路、１３…整流器、１４…昇圧回路、１５…インバータ回路、１６…負荷回路、１７…放電灯、１８…非常用電源充電回路、１９…電源監視回路、２０…充電回路、２１…非常用電源、２２…非常用電源昇圧回路、２３…壁切りスイッチ部、２４…スイッチ、２５…フォトダイオード、２６…フォトトランジスタ、２７…点灯制御部、２８…昇圧制御部、２９…スイッチ素子、３０…非常時調光回路、３１…スイッチ素子、３２…定電力制御部、３３…温度検出手段、３４…ランプ異常電圧検出回路
DESCRIPTION OF SYMBOLS 11 ... AC power supply, 12 ... Noise prevention circuit, 13 ... Rectifier, 14 ... Booster circuit, 15 ... Inverter circuit, 16 ... Load circuit, 17 ... Discharge lamp, 18 ... Emergency power supply charging circuit, 19 ... Power supply monitoring circuit, 20 DESCRIPTION OF SYMBOLS ... Charging circuit, 21 ... Emergency power supply, 22 ... Emergency power supply booster circuit, 23 ... Wall cutting switch part, 24 ... Switch, 25 ... Photodiode, 26 ... Phototransistor, 27 ... Lighting control part, 28 ... Boost control part , 29 ... switch element, 30 ... emergency dimming circuit, 31 ... switch element, 32 ... constant power control unit, 33 ... temperature detection means, 34 ... lamp abnormal voltage detection circuit

Claims

通常時は交流電源を整流して得られた直流を高周波変換し放電灯を高周波点灯する常用点灯装置と、通常時は交流電源を整流して非常用電源を充電するとともに非常時は非常用電源を電源として放電灯を非常点灯させる非常用点灯装置とを一体的に形成した放電灯点灯装置であって、
前記交流電源を整流して直流を得る整流器と；
前記整流器で得られた直流電圧を昇圧する昇圧回路と；
前記昇圧回路で昇圧された電圧を高周波電圧に変換し放電灯を高周波点灯するインバータ回路と；
前記整流器で得られた直流電力を非常用電源に充電する非常用電源充電回路と；
前記非常時に前記非常用電源の電圧を昇圧する非常用電源昇圧回路と；
通常時は前記昇圧回路で昇圧された前記整流器からの直流電圧を高周波電圧に変換し定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には前記非常用電源昇圧回路からの電圧を高周波電圧に変換し定電力で放電灯を調光点灯する非常点灯動作を行う点灯制御部と；
を備えたことを特徴とする放電灯点灯装置。 A normal lighting device that converts the DC power obtained by rectifying the AC power source into high-frequency power to light up the discharge lamp at high frequency, and a normal power source that rectifies the AC power source and charges the emergency power supply at normal time. A discharge lamp lighting device integrally formed with an emergency lighting device for emergency lighting of a discharge lamp using as a power source,
A rectifier for rectifying the alternating current power source to obtain direct current;
A booster circuit for boosting a DC voltage obtained by the rectifier;
An inverter circuit for converting the voltage boosted by the booster circuit into a high-frequency voltage and lighting the discharge lamp at a high frequency;
An emergency power supply charging circuit for charging an emergency power supply with DC power obtained by the rectifier;
An emergency power boosting circuit for boosting the voltage of the emergency power supply in the emergency;
During normal operation, the DC voltage from the rectifier boosted by the booster circuit is converted into a high frequency voltage, and a normal lighting operation is performed in which the discharge lamp is turned on at a high frequency with constant power. In an emergency, the voltage from the emergency power supply booster circuit is changed to a high frequency. A lighting control unit for performing an emergency lighting operation for converting the voltage into a voltage and dimming the discharge lamp with constant power;
A discharge lamp lighting device comprising:

通常時は交流電源を整流して得られた直流を高周波変換し放電灯を高周波点灯する常用点灯装置と、通常時は交流電源を整流して非常用電源を充電するとともに非常時は非常用電源を電源として放電灯を非常点灯させる非常用点灯装置とを一体的に形成した放電灯点灯装置であって、
前記交流電源を整流して直流を得る整流器と；
前記整流器で得られた直流電圧を昇圧する昇圧回路と；
前記昇圧回路で昇圧された電圧を高周波電圧に変換し放電灯を高周波点灯するインバータ回路と；
前記整流器で得られた直流電力を非常用電源に充電する非常用電源充電回路と；
前記非常時に前記非常用電源の電圧を昇圧する非常用電源昇圧回路と；
通常時は前記昇圧回路で昇圧された前記整流器からの直流電圧を高周波電圧に変換し定電力で放電灯を高周波点灯する通常点灯動作を行い、非常時には前記非常用電源昇圧回路からの電圧を高周波電圧に変換し定電流で放電灯を調光点灯する非常点灯動作を行う点灯制御部と；
を備えたことを特徴とする放電灯点灯装置。 A normal lighting device that converts the DC power obtained by rectifying the AC power source into high-frequency power to light up the discharge lamp at high frequency, and a normal power source that rectifies the AC power source and charges the emergency power supply at normal time. A discharge lamp lighting device integrally formed with an emergency lighting device for emergency lighting of a discharge lamp using as a power source,
A rectifier for rectifying the alternating current power source to obtain direct current;
A booster circuit for boosting a DC voltage obtained by the rectifier;
An inverter circuit for converting the voltage boosted by the booster circuit into a high-frequency voltage and lighting the discharge lamp at a high frequency;
An emergency power supply charging circuit for charging an emergency power supply with DC power obtained by the rectifier;
An emergency power boosting circuit for boosting the voltage of the emergency power supply in the emergency;
During normal operation, the DC voltage from the rectifier boosted by the booster circuit is converted into a high frequency voltage, and a normal lighting operation is performed in which the discharge lamp is turned on at a high frequency with constant power. In an emergency, the voltage from the emergency power supply booster circuit is changed to a high frequency. A lighting control unit for performing an emergency lighting operation for converting the voltage into a voltage and dimming the discharge lamp with a constant current;
A discharge lamp lighting device comprising:

前記点灯制御部は、放電灯の温度または周囲温度が所定温度以下では定電力で放電灯を高周波点灯し、所定温度を超えると定電流で放電灯を点灯する非常点灯動作を行うことを特徴とする請求項１または２記載の放電灯点灯装置。 The lighting control unit performs an emergency lighting operation of lighting the discharge lamp at a high frequency with a constant power when the temperature of the discharge lamp or the ambient temperature is equal to or lower than a predetermined temperature, and lighting the discharge lamp with a constant current when the temperature exceeds the predetermined temperature. The discharge lamp lighting device according to claim 1 or 2.

前記点灯制御部は、放電灯の温度が所定温度を超えたか否かを放電灯のランプ電圧で判定することを特徴とする請求項３記載の放電灯点灯装置。
The discharge lamp lighting device according to claim 3, wherein the lighting control unit determines whether or not the temperature of the discharge lamp exceeds a predetermined temperature based on a lamp voltage of the discharge lamp.