JP4836587B2 - High pressure discharge lamp lighting device - Google Patents

High pressure discharge lamp lighting device Download PDF

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JP4836587B2
JP4836587B2 JP2006020251A JP2006020251A JP4836587B2 JP 4836587 B2 JP4836587 B2 JP 4836587B2 JP 2006020251 A JP2006020251 A JP 2006020251A JP 2006020251 A JP2006020251 A JP 2006020251A JP 4836587 B2 JP4836587 B2 JP 4836587B2
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circuit
voltage
discharge lamp
pressure discharge
power supply
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JP2007200793A (en
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秀樹 福田
健一郎 西
広康 私市
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Mitsubishi Electric Corp
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本発明は、高圧水銀ランプ、高圧ナトリウムランプ、メタルハライドランプ等の高圧放電灯を点灯制御する高圧放電灯点灯装置に関するものである。   The present invention relates to a high pressure discharge lamp lighting device that controls lighting of a high pressure discharge lamp such as a high pressure mercury lamp, a high pressure sodium lamp, or a metal halide lamp.

従来の高圧放電灯点灯装置は、高圧放電灯を始動点灯するパルス電圧を発生させるためのイグナイタ始動回路を備えている。このイグナイタ始動回路は、２次巻線が高圧放電灯及びインダクタの間に挿入された高圧トランスと、高圧トランスの１次巻線の一端側に設けられ、チョッパ回路からの電流により充電される一方の充放電回路と、一対のＦＥＴのうち一方のＦＥＴのオン時にインダクタを介して流れる電流により充電される他方の充放電回路と、高圧トランスの１次巻線の他端に接続された３端子サイリスタと、この３端子サイリスタのゲートと接続され、他方の充放電回路の充電電圧がブレークオーバ電圧に達したときに導通して３端子サイリスタをオンし、一方の充放電回路の充電電圧を高圧トランスの１次巻線に印加させる２端子サイリスタとを備えている（例えば、特許文献１参照）。   The conventional high pressure discharge lamp lighting device includes an igniter start circuit for generating a pulse voltage for starting and lighting the high pressure discharge lamp. This igniter starting circuit is provided with a high-voltage transformer whose secondary winding is inserted between the high-pressure discharge lamp and the inductor, and one end of the primary winding of the high-voltage transformer, and is charged by the current from the chopper circuit. Charge / discharge circuit, the other charge / discharge circuit charged by the current flowing through the inductor when one of the pair of FETs is turned on, and the three terminals connected to the other end of the primary winding of the high-voltage transformer The thyristor is connected to the gate of this three-terminal thyristor, and is turned on when the charging voltage of the other charging / discharging circuit reaches the breakover voltage, turning on the three-terminal thyristor, and increasing the charging voltage of one charging / discharging circuit. And a two-terminal thyristor to be applied to the primary winding of the transformer (see, for example, Patent Document 1).

特開２００５−２０３１８５公報（第６頁、図７）JP-A-2005-203185 (6th page, FIG. 7)

前述した従来の高圧放電灯点灯装置では、イグナイタ始動回路において、高圧放電灯を始動点灯するための高電圧パルスを発生又は停止させるために、２種のサイリスタと２つの充放電回路を用いており、回路構成が複雑になっていた。   In the conventional high pressure discharge lamp lighting device described above, two types of thyristors and two charge / discharge circuits are used in the igniter start circuit to generate or stop a high voltage pulse for starting and lighting the high pressure discharge lamp. The circuit configuration was complicated.

本発明は、前記のような課題を解決するためになされたものであり、回路構成が簡単で、小型のイグナイタ始動回路を備えた高圧放電灯点灯装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a high-pressure discharge lamp lighting device having a simple circuit configuration and a small igniter starting circuit.

本発明に係る高圧放電灯点灯装置は、高圧放電灯が取り付けられる負荷回路と、商用電源と接続される整流回路及び該整流回路の出力間に接続された昇圧型ＰＦＣ回路で構成され、商用電源を所望の直流電圧に変換する直流電源回路と、直流電源回路からの直流電圧を交流電圧に変換し、負荷回路に供給するインバータ回路と、直流電源回路の出力間に直列に接続された抵抗、ダイオード及び充放電コンデンサにより構成された充放電回路、２次巻線が負荷回路に挿入され、１次巻線の一端がダイオード及び充放電コンデンサの接続点に接続された昇圧トランス、該昇圧トランスの１次巻線の他端と充放電コンデンサの負極側の間に挿入された２端子サイリスタを有し、２端子サイリスタが導通したときに昇圧トランスの２次巻線に高電圧パルスを発生させるイグナイタ始動回路と、負荷回路の高圧放電灯を始動する際、充放電回路の充電電圧が２端子サイリスタを導通させる電圧値となるように直流電源回路を制御し、高圧放電灯が点灯した後は、充電電圧が２端子サイリスタを非導通させる電圧値となるように直流電源回路を制御する制御部とを備えたものである。
A high pressure discharge lamp lighting device according to the present invention includes a load circuit to which a high pressure discharge lamp is attached, a rectifier circuit connected to a commercial power source, and a boost type PFC circuit connected between outputs of the rectifier circuit. a desired DC voltage dc power supply circuit that converts into a DC voltage from the DC power source circuit is converted into an AC voltage, and an inverter circuit for supplying a load circuit, connected in series between the output of the DC power supply circuit resistance, the charging and discharging circuit constituted by diodes and charging and discharging the capacitor, the secondary winding is inserted into the load circuit, the step-up transformer with one end of the primary winding is connected to a connection point of the diodes and charging and discharging the capacitor, the boost It has a two-terminal thyristor inserted between the other end of the primary winding of the transformer and the negative electrode side of the charge / discharge capacitor. When the two-terminal thyristor becomes conductive, the secondary winding of the step-up transformer When starting the igniter starting circuit for generating the load and the high-pressure discharge lamp of the load circuit, the DC power supply circuit is controlled so that the charging voltage of the charging / discharging circuit becomes a voltage value for conducting the two-terminal thyristor. After being lit, a control unit is provided that controls the DC power supply circuit so that the charging voltage has a voltage value that causes the two-terminal thyristor to become non-conductive.

本発明においては、負荷回路の高圧放電灯を始動する際、充放電回路の充電電圧が２端子サイリスタを導通させる電圧値となるように直流電源回路を制御し、高圧放電灯が点灯した後は、その充電電圧が２端子サイリスタを非導通させる電圧値となるように直流電源回路を制御するようにしたので、充放電回路と２端子サイリスタをそれぞれ一部品で済み、このため、イグナイタ始動回路の構成が簡単になり、小型化を図れるという効果がある。 In the present invention, when starting the high-pressure discharge lamp of the load circuit, the DC power supply circuit is controlled so that the charging voltage of the charging / discharging circuit becomes a voltage value for conducting the two-terminal thyristor. Since the DC power supply circuit is controlled so that the charging voltage becomes a voltage value that makes the two-terminal thyristor non-conductive, the charging / discharging circuit and the two-terminal thyristor are each one component. The structure is simplified, and the size can be reduced.

実施の形態１．
図１は本発明の実施の形態１に係る高圧放電灯点灯装置の構成を示す回路図である。
図中に示す本実施の形態の高圧放電灯点灯装置は、直流電源回路１と、ハーフブリッジ型のインバータ回路と、負荷回路と、イグナイタ始動回路と、制御回路１４とを備えている。直流電源回路１は、例えば、交流電源の電力を直流電力に整流する整流回路と、この整流回路の出力間に接続された昇圧型ＰＦＣ（Power Factor Contorol ）回路とで構成されている。この昇圧型ＰＦＣ回路には、インダクタ、制御回路１４のオン・オフ制御に基づいて整流回路の出力を昇圧するスイッチング素子等が設けられている。 Embodiment 1 FIG.
FIG. 1 is a circuit diagram showing a configuration of a high pressure discharge lamp lighting device according to Embodiment 1 of the present invention.
The high pressure discharge lamp lighting device of the present embodiment shown in the figure includes a DC power supply circuit 1, a half-bridge type inverter circuit, a load circuit, an igniter starting circuit, and a control circuit 14. The DC power supply circuit 1 includes, for example, a rectifier circuit that rectifies the power of the AC power supply into DC power, and a step-up PFC (Power Factor Control) circuit connected between the outputs of the rectifier circuit. This step-up PFC circuit is provided with an inductor, a switching element for stepping up the output of the rectifier circuit based on on / off control of the control circuit 14 and the like.

前記のインバータ回路は、直流電源回路１の出力間に直列に接続された第１のスイッチング素子２及び第２のスイッチング素子３と、これらスイッチング素子２，３に並列に接続され、第１の電解コンデンサ４及び第２の電解コンデンサ５の直列回路とから構成されている。負荷回路は、第１及び第２のスイッチング素子２，３の接続点と第１及び第２の電解コンデンサ４，５の接続点との間に、後述する昇圧トランス８の２次巻線８ｂを介在して直列に接続されたインダクタ６及び高圧放電灯９と、この高圧放電灯９及び前記２次巻線８ｂに並列に接続されたコンデンサ７とで構成されている。前述した高圧放電灯９として、ＨＩＤランプ（高圧水銀ランプ）、高圧ナトリウムランプ、メタルハライドランプ等が用いられている。   The inverter circuit includes a first switching element 2 and a second switching element 3 connected in series between the outputs of the DC power supply circuit 1, and is connected in parallel to the switching elements 2 and 3. It consists of a series circuit of a capacitor 4 and a second electrolytic capacitor 5. The load circuit includes a secondary winding 8b of a step-up transformer 8 described later between a connection point of the first and second switching elements 2 and 3 and a connection point of the first and second electrolytic capacitors 4 and 5. The inductor 6 and the high-pressure discharge lamp 9 are connected in series with each other, and the capacitor 7 is connected in parallel with the high-pressure discharge lamp 9 and the secondary winding 8b. As the high-pressure discharge lamp 9 described above, an HID lamp (high-pressure mercury lamp), a high-pressure sodium lamp, a metal halide lamp, or the like is used.

イグナイタ始動回路は、直流電源回路１の出力間に直列に接続された抵抗１０、ダイオード１１及び充放電コンデンサ１２と、２次巻線８ｂが前述の如くインダクタ６及び高圧放電灯９の間に挿入され、１次巻線８ａの一端がダイオード１１及び充放電コンデンサ１２の接続点に接続された昇圧トランス８と、昇圧トランス８の１次巻線の他端及び充放電コンデンサ１２の負極側の間に挿入された２端子サイリスタ１３とから構成されている。なお、前述した抵抗１０、ダイオード１１及び充放電コンデンサ１２により充放電回路が構成されている。   In the igniter starting circuit, the resistor 10, the diode 11 and the charge / discharge capacitor 12 connected in series between the outputs of the DC power supply circuit 1 and the secondary winding 8b are inserted between the inductor 6 and the high pressure discharge lamp 9 as described above. And between the other end of the primary winding of the step-up transformer 8 and the negative electrode side of the charge / discharge capacitor 12. One end of the primary winding 8 a is connected to the connection point of the diode 11 and the charge / discharge capacitor 12. And a two-terminal thyristor 13 inserted into the. Note that a charge / discharge circuit is configured by the resistor 10, the diode 11, and the charge / discharge capacitor 12 described above.

制御回路１４は、動作説明時に詳述するが、負荷回路の高圧放電灯９を始動する際、充放電回路の充電電圧が２端子サイリスタ１３を導通させる電圧値、即ち２端子サイリスタ１３のブレークオーバー電圧に達する電圧値となるように直流電源回路１を制御し、高圧放電灯９が点灯した後は、その充電電圧が２端子サイリスタ１３を非導通させる電圧値（ブレークオーバー電圧より低い電圧値）となるように直流電源回路１を制御する。高圧放電灯９が点灯したか否かの判別は、図１には図示していないが、例えば電圧検出回路により検出された高圧放電灯９の電圧が予め設定された電圧値より低くなったときに、高圧放電灯９が点灯したと判別する。なお、これに代えて、電流検出回路の検出電流から高圧放電灯９が点灯したか否かを判別するようにしても良い。この場合、その検出電流が予め設定された電流値よりも高くなったときに、高圧放電灯９が点灯したと判別する。   The control circuit 14 will be described in detail when explaining the operation. When starting the high-pressure discharge lamp 9 of the load circuit, the control circuit 14 sets the voltage value at which the charging voltage of the charging / discharging circuit makes the two-terminal thyristor 13 conductive, that is, the breakover of the two-terminal thyristor 13. After the DC power supply circuit 1 is controlled to reach a voltage value that reaches the voltage and the high-pressure discharge lamp 9 is lit, the charging voltage is a voltage value that makes the two-terminal thyristor 13 non-conductive (a voltage value lower than the breakover voltage). The DC power supply circuit 1 is controlled so that The determination as to whether or not the high-pressure discharge lamp 9 is lit is not shown in FIG. 1, but for example, when the voltage of the high-pressure discharge lamp 9 detected by the voltage detection circuit becomes lower than a preset voltage value. Then, it is determined that the high pressure discharge lamp 9 has been turned on. Instead of this, it may be determined whether or not the high-pressure discharge lamp 9 has been lit based on the current detected by the current detection circuit. In this case, when the detected current becomes higher than a preset current value, it is determined that the high pressure discharge lamp 9 has been turned on.

次に、本実施の形態の高圧放電灯点灯装置の動作について説明する。
制御回路１４は、高圧放電灯９を始動する際、第１のスイッチング素子２及び第２のスイッチング素子３を交互にオン・オフすると共に、直流電源回路１を制御し、かつ、電圧検出回路の検出電圧を通じて高圧放電灯９が点灯したか否かを判別する。第１及び第２のスイッチング素子２，３の制御は、予め設定された第１の期間、第１のスイッチング素子２のみを高周波でオン・オフし、次いで、第２の期間、第２のスイッチング素子３のみを高周波でオン・オフし、この第１及び第２の期間の切り替えを低周波で繰り返し行っている。また、直流電源回路１側の制御は、抵抗１０及びダイオード１１を介して充放電コンデンサ１２に充電される電圧が２端子サイリスタ１３のブレークオーバー電圧に達する電圧値となるように行っている。 Next, the operation of the high pressure discharge lamp lighting device of the present embodiment will be described.
When starting the high-pressure discharge lamp 9, the control circuit 14 alternately turns on and off the first switching element 2 and the second switching element 3, controls the DC power supply circuit 1, and the voltage detection circuit. It is determined whether or not the high pressure discharge lamp 9 has been turned on through the detection voltage. The first and second switching elements 2 and 3 are controlled by turning on / off only the first switching element 2 at a high frequency for a preset first period, and then for the second period. Only the element 3 is turned on / off at a high frequency, and the switching between the first and second periods is repeated at a low frequency. The control on the DC power supply circuit 1 side is performed so that the voltage charged to the charge / discharge capacitor 12 via the resistor 10 and the diode 11 reaches a voltage value that reaches the breakover voltage of the two-terminal thyristor 13.

この制御により、充放電コンデンサ１２の充電電圧が２端子サイリスタ１３のブレークオーバー電圧に達する毎に放電され、その電圧が昇圧トランス８の１次巻線８ａに間欠的に印加され、２次巻線８ｂに高電圧パルスが発生し、第１及び第２のスイッチング素子２，３の動作による点灯周波数の矩形波電圧に重畳し、高圧放電灯９に繰り返し印加される。一方、制御回路１４は、昇圧トランス８の２次巻線８ｂに高電圧パルスを発生させているときに、電圧検出回路の検出電圧が予め設定された電圧値より低くなったことを検知すると、高圧放電灯９が点灯したと判別して、充放電コンデンサ１２の充電電圧が２端子サイリスタ１３のブレークオーバー電圧より低くなるように直流電源回路１を制御し、昇圧トランス８の２次巻線８ｂに発生する高電圧パルスを停止させる。   By this control, the charging voltage of the charging / discharging capacitor 12 is discharged every time it reaches the breakover voltage of the two-terminal thyristor 13, and the voltage is intermittently applied to the primary winding 8 a of the step-up transformer 8. A high voltage pulse is generated in 8b, is superimposed on a rectangular wave voltage of the lighting frequency by the operation of the first and second switching elements 2 and 3, and is repeatedly applied to the high pressure discharge lamp 9. On the other hand, when the control circuit 14 generates a high voltage pulse in the secondary winding 8b of the step-up transformer 8, and detects that the detection voltage of the voltage detection circuit is lower than a preset voltage value, It is determined that the high-pressure discharge lamp 9 has been turned on, and the DC power supply circuit 1 is controlled so that the charging voltage of the charging / discharging capacitor 12 is lower than the breakover voltage of the two-terminal thyristor 13, and the secondary winding 8 b of the step-up transformer 8. The high-voltage pulse generated in is stopped.

以上のように実施の形態１によれば、負荷回路の高圧放電灯９を始動する際、充放電コンデンサ１２の充電電圧が２端子サイリスタ１３のブレークオーバー電圧に達する電圧値となるように直流電源回路１を制御し、高圧放電灯９が点灯した後は、その充電電圧が２端子サイリスタ１３のブレークオーバー電圧より低い電圧値となるように直流電源回路１を制御するようにしたので、充放電回路と２端子サイリスタ１３をそれぞれ一部品で済み、このため、イグナイタ始動回路の構成が簡単になり、小型化を図れるという効果がある。   As described above, according to the first embodiment, when starting the high-pressure discharge lamp 9 of the load circuit, the DC power supply is set so that the charging voltage of the charging / discharging capacitor 12 reaches a voltage value that reaches the breakover voltage of the two-terminal thyristor 13. After the circuit 1 is controlled and the high-pressure discharge lamp 9 is lit, the DC power supply circuit 1 is controlled so that the charging voltage is lower than the breakover voltage of the two-terminal thyristor 13. Since the circuit and the two-terminal thyristor 13 are each one component, the configuration of the igniter starting circuit is simplified and the size can be reduced.

実施の形態２．
図２は本発明の実施の形態２に係る高圧放電灯点灯装置の構成を示す回路図である。なお、図１で説明した実施の形態１と同一又は相当部分には同じ符号を付し説明を省略する。
実施の形態１では、直流電源回路１の出力間に、抵抗１０、ダイオード１１及び充放電コンデンサ１２を直列に接続してなる充放電回路を設けているが、本実施の形態は、インダクタ６及び昇圧トランス８の２次巻線８ｂの接続点と直流電源回路１の負極側（アース側）との間に、抵抗１０、ダイオード１１及び充放電コンデンサ１２を直列に接続してなる充放電回路を設けたものである。 Embodiment 2. FIG.
FIG. 2 is a circuit diagram showing a configuration of a high pressure discharge lamp lighting device according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIG. 1, and description is abbreviate | omitted.
In the first embodiment, a charging / discharging circuit in which a resistor 10, a diode 11, and a charging / discharging capacitor 12 are connected in series is provided between the outputs of the DC power supply circuit 1. However, in the present embodiment, the inductor 6 and the A charging / discharging circuit in which a resistor 10, a diode 11, and a charging / discharging capacitor 12 are connected in series between a connection point of the secondary winding 8b of the step-up transformer 8 and the negative electrode side (ground side) of the DC power supply circuit 1. It is provided.

本実施の形態におけるイグナイタ始動回路の２端子サイリスタ１３は、実施の形態１と同様に、充放電コンデンサ１２に昇圧トランス８の１次巻線８ａを介して接続されており、始動時に高圧放電灯９に印加される電圧よりブレークオーバー電圧が低く、高圧放電灯９が点灯した後の電圧よりもブレークオーバー電圧が高い特性を有するものが選定されている。また、制御回路１４は、高圧放電灯９を始動する際、実施の形態１と同様に、まず、第１の期間、第１のスイッチング素子２のみを高周波でオン・オフし、次いで、第２の期間、第２のスイッチング素子３のみを高周波でオン・オフし、この切り替えを低周波で繰り返し行う。   Similarly to the first embodiment, the two-terminal thyristor 13 of the igniter starting circuit in the present embodiment is connected to the charge / discharge capacitor 12 via the primary winding 8a of the step-up transformer 8, and at the time of starting the high-pressure discharge lamp 9 having a characteristic that the breakover voltage is lower than the voltage applied to 9 and the breakover voltage is higher than the voltage after the high-pressure discharge lamp 9 is lit. When starting the high-pressure discharge lamp 9, the control circuit 14 first turns on and off only the first switching element 2 at a high frequency for the first period, and then the second During this period, only the second switching element 3 is turned on / off at a high frequency, and this switching is repeated at a low frequency.

次に、本実施の形態の高圧放電灯点灯装置の動作について説明する。
制御回路１４は、負荷回路の高圧放電灯９を始動する際、前述したように、第１の期間、第１のスイッチング素子２のみを高周波でオン・オフし、次いで、第２の期間、第２のスイッチング素子３のみを高周波でオン・オフし、この切り替えを低周波で繰り返し行う。第１のスイッチング素子がオン・オフ動作しているときにインダクタ６を介して流れる電流が充放電コンデンサ１２に充電され、その充電電圧が２端子サイリスタ１３のブレークオーバー電圧に達したときに、その充電電圧が放電されて昇圧トランス８の１次巻線８ａに印加し、その２次巻線８ｂに高電圧パルスが発生し、第１及び第２のスイッチング素子２，３の動作による点灯周波数の矩形波電圧に重畳して、高圧放電灯９に印加される。 Next, the operation of the high pressure discharge lamp lighting device of the present embodiment will be described.
As described above, when starting the high-pressure discharge lamp 9 of the load circuit, the control circuit 14 turns on / off only the first switching element 2 at a high frequency in the first period, and then in the second period, Only the second switching element 3 is turned on / off at a high frequency, and this switching is repeated at a low frequency. When the first switching element is on / off, the current flowing through the inductor 6 is charged into the charge / discharge capacitor 12, and when the charge voltage reaches the breakover voltage of the two-terminal thyristor 13, The charging voltage is discharged and applied to the primary winding 8a of the step-up transformer 8, a high voltage pulse is generated in the secondary winding 8b, and the lighting frequency due to the operation of the first and second switching elements 2 and 3 is increased. The voltage is applied to the high-pressure discharge lamp 9 while being superimposed on the rectangular wave voltage.

一方、制御回路１４は、高電圧パルスの印加により高圧放電灯９が点灯すると、第１及び第２のスイッチング素子２，３を高周波で交互にオン・オフし、高圧放電灯９の点灯を継続する。この時、高圧放電灯９に印加される電圧が低下するので、放電コンデンサ１２の充電電圧が２端子サイリスタ１３のブレークオーバー電圧より低くなり、昇圧トランス８の２次巻線８ａに発生する高電圧パルスを停止する。なお、制御回路１４による高圧放電灯９の点灯判別は、電圧検出回路の検出電圧が予め設定された電圧値より低くなったことを検知したときである。   On the other hand, when the high-pressure discharge lamp 9 is lit by application of a high voltage pulse, the control circuit 14 alternately turns on and off the first and second switching elements 2 and 3 at a high frequency, and continues lighting the high-pressure discharge lamp 9. To do. At this time, since the voltage applied to the high-pressure discharge lamp 9 decreases, the charging voltage of the discharge capacitor 12 becomes lower than the breakover voltage of the two-terminal thyristor 13, and the high voltage generated in the secondary winding 8 a of the step-up transformer 8. Stop the pulse. Note that the lighting determination of the high-pressure discharge lamp 9 by the control circuit 14 is when it is detected that the detection voltage of the voltage detection circuit has become lower than a preset voltage value.

以上のように実施の形態２によれば、高圧放電灯９の始動時には、充放電コンデンサ１２への充電電圧が２端子サイリスタ１３のブレークオーバー電圧に達する毎に昇圧トランス８の２次巻線８ｂに高電圧パルスが発生し、高圧放電灯９が点灯した際には、充放電コンデンサ１２への充電電圧が２端子サイリスタ１３のブレークオーバー電圧より低くなって昇圧トランス８の２次巻線８ｂに発生する高電圧パルスが停止するので、高圧放電灯９の点灯時の直流電源回路１の出力電圧の変更に対する制御が不要になり、このため、イグナイタ始動回路を簡素化及び小型化できるという効果に加え、制御回路１４の構成を実施の形態１と比べ簡素化できる。   As described above, according to the second embodiment, when the high-pressure discharge lamp 9 is started, the secondary winding 8b of the step-up transformer 8 every time the charging voltage to the charge / discharge capacitor 12 reaches the breakover voltage of the two-terminal thyristor 13. When a high voltage pulse is generated and the high pressure discharge lamp 9 is turned on, the charge voltage to the charge / discharge capacitor 12 becomes lower than the breakover voltage of the two-terminal thyristor 13 and is applied to the secondary winding 8b of the step-up transformer 8. Since the generated high voltage pulse stops, it becomes unnecessary to control the change of the output voltage of the DC power supply circuit 1 when the high pressure discharge lamp 9 is turned on. For this reason, the igniter start circuit can be simplified and miniaturized. In addition, the configuration of the control circuit 14 can be simplified as compared with the first embodiment.

本発明の実施の形態１に係る高圧放電灯点灯装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the high pressure discharge lamp lighting device which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る高圧放電灯点灯装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the high pressure discharge lamp lighting device which concerns on Embodiment 2 of this invention.

符号の説明Explanation of symbols

１ 直流電源回路、２ 第１のスイッチング素子、３ 第２のスイッチング素子、４ 第１の電解コンデンサ、５ 第２の電解コンデンサ、６ インダクタ、７ コンデンサ、８ 昇圧トランス、９ 高圧放電灯、１０ 抵抗、１１ ダイオード、１２ 充放電コンデンサ、１３ ２端子サイリスタ、１４ 制御回路。
DESCRIPTION OF SYMBOLS 1 DC power supply circuit 2 1st switching element 3 2nd switching element 4 1st electrolytic capacitor 5 2nd electrolytic capacitor 6 Inductor 7 Capacitor 8 Boost transformer 9 High pressure discharge lamp 10 Resistance , 11 Diode, 12 Charging / discharging capacitor, 13 Two-terminal thyristor, 14 Control circuit.

Claims (3)

高圧放電灯が取り付けられる負荷回路と、
商用電源と接続される整流回路及び該整流回路の出力間に接続された昇圧型ＰＦＣ回路で構成され、商用電源を所望の直流電圧に変換する直流電源回路と、
該直流電源回路からの直流電圧を交流電圧に変換し、前記負荷回路に供給するインバータ回路と、
前記直流電源回路の出力間に直列に接続された抵抗、ダイオード及び充放電コンデンサにより構成された充放電回路、２次巻線が前記負荷回路に挿入され、１次巻線の一端が前記ダイオード及び前記充放電コンデンサの接続点に接続された昇圧トランス、該昇圧トランスの１次巻線の他端と前記充放電コンデンサの負極側の間に挿入された２端子サイリスタを有し、前記２端子サイリスタが導通したときに前記昇圧トランスの２次巻線に高電圧パルスを発生させるイグナイタ始動回路と、
前記負荷回路の高圧放電灯を始動する際、前記充放電回路の充電電圧が前記２端子サイリスタを導通させる電圧値となるように前記直流電源回路を制御し、前記高圧放電灯が点灯した後は、前記充電電圧が前記２端子サイリスタを非導通させる電圧値となるように前記直流電源回路を制御する制御部と
を備えたことを特徴とする高圧放電灯点灯装置。 A load circuit to which a high-pressure discharge lamp is attached;
Consists of connected boost PFC circuit between the output of the rectifier circuit and the rectifier circuit is connected to a commercial power source, a dc power supply circuit that converts a commercial power source to a desired DC voltage,
An inverter circuit that converts a DC voltage from the DC power supply circuit into an AC voltage and supplies the AC voltage to the load circuit;
A charge / discharge circuit comprising a resistor, a diode and a charge / discharge capacitor connected in series between the outputs of the DC power supply circuit; a secondary winding is inserted into the load circuit; and one end of the primary winding is the diode and A step-up transformer connected to a connection point of the charge / discharge capacitor; a two-terminal thyristor inserted between the other end of the primary winding of the step-up transformer and the negative electrode side of the charge / discharge capacitor; An igniter starting circuit for generating a high voltage pulse in the secondary winding of the step-up transformer when
When starting the high-pressure discharge lamp of the load circuit, the DC power supply circuit is controlled so that the charging voltage of the charge / discharge circuit becomes a voltage value for conducting the two-terminal thyristor. A high pressure discharge lamp lighting device comprising: a control unit that controls the DC power supply circuit so that the charging voltage has a voltage value that makes the two-terminal thyristor non-conductive. 前記負荷回路の高圧放電灯の電圧を検出する電圧検出回路を備え、
前記制御部は、前記電圧検出回路の検出電圧が予め設定された電圧値より低くなったときに高圧放電灯の点灯を判別することを特徴とする請求項１記載の高圧放電灯点灯装置。 A voltage detection circuit for detecting the voltage of the high-pressure discharge lamp of the load circuit;
The high pressure discharge lamp lighting device according to claim 1, wherein the control unit determines lighting of the high pressure discharge lamp when a detection voltage of the voltage detection circuit becomes lower than a preset voltage value. 前記負荷回路の高圧放電灯の電流を検出する電流検出回路を備え、
前記制御部は、前記電流検出回路の検出電流が予め設定された電流値より高くなったときに高圧放電灯の点灯を判別することを特徴とする請求項１記載の高圧放電灯点灯装置。 A current detection circuit for detecting the current of the high-pressure discharge lamp of the load circuit;
The high pressure discharge lamp lighting device according to claim 1, wherein the control unit determines lighting of the high pressure discharge lamp when a detection current of the current detection circuit becomes higher than a preset current value.
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