JP2006260845A - Device for lighting high-pressure discharge lamp and device for illuminating high-pressure discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for lighting a high-pressure discharge lamp capable of stably starting a high-pressure discharge lamp even with aggravated starting properties. <P>SOLUTION: Tow pairs of capacitors C1, C2 are connected in series to a direct-current power source obtained by rectifying an alternate-current power source, and are connected in parallel with paired switching elements S2a, S2b connected in series with each other. At least either of the capacitors C1, C2 is provided with an auxiliary power source circuit 17 to supplement a charge, a high-pressure discharge lamp 13 and an igniter 16 are connected in a load circuit 24 between contact points of the two pairs of capacitors C1, C2 and the switching elements S2a, S2b, and pulse-state high voltage capable of starting the high-pressure discharge lamp 13 is made generated by the igniter 16. A control means supplies the capacitors with charge of the auxiliary power source circuit 17 by detecting fall of voltage by a voltage detecting means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high pressure discharge lamp lighting device for lighting a high pressure discharge lamp and an illumination device for the high pressure discharge lamp.

  In general, since a high pressure discharge lamp has a characteristic of starting a discharge by changing from a glow discharge to an arc discharge, it is necessary to supply high energy for a predetermined time for the arc discharge transition when the high pressure discharge lamp is turned on. Accordingly, for example, a pulsed high voltage necessary for starting a high-pressure discharge lamp using an igniter is generated for a short period of time.

  Further, in a high pressure discharge lamp lighting device that controls lighting of a high pressure discharge lamp with two regulators using two sets of capacitors, power is supplied to the high pressure discharge lamp alternately from the two sets of capacitors at a predetermined cycle. Yes. This is to prevent one electrode from generating heat when power is continuously supplied to the high-pressure discharge lamp from one direction.

As a high pressure discharge lamp lighting device that controls lighting of a high pressure discharge lamp with two regulators using two sets of capacitors, the respective capacities are different so that the voltages at both ends of the two sets of capacitors are different from each other. There is one that enables a smooth transition from glow discharge to arc discharge (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2004-303789

  However, in Patent Document 1, power is supplied to the high-pressure discharge lamp alternately from the two sets of capacitors having different capacities at a predetermined cycle during normal lighting. The power source to be changed fluctuates at a predetermined cycle. To prevent this, the two capacitors must have the same capacity after lighting. Further, when the high-pressure discharge lamp is started, even if power is supplied from any one of the two sets of capacitors, a high pulse-like voltage is applied from the igniter, so the burden on the igniter is large.

  Therefore, it is conceivable to apply a pulsed high voltage from the igniter when the two sets of capacitors have the same capacity and power is supplied from one of the two sets of capacitors. When starting the discharge lamp, the voltages of the two sets of capacitors tend to be unbalanced.

  FIG. 5 is a circuit diagram of a conventional high pressure discharge lamp lighting device. The DC power source 11 is boosted by the boost chopper circuit 12 and becomes a power source for the high-pressure discharge lamp 13. The control circuit 14 controls the frequency of the two regulators 15a and 15b to supply low-frequency power to the high-pressure discharge lamp 13 via the filter capacitor C4. Apply.

  The step-up chopper circuit 12 includes a reactor L1, a switch S1, a diode D1, and a pair of capacitors C1 and C2. The regulator 15a includes a switch S2a, a diode D2a, and a reactor L2. Similarly, the regulator 15b includes a switch S2b, a diode D2b, and a reactor L2. The control circuit 14 alternately controls the frequency of the switches S2a and S2b of the two regulators 15a and 15b, and supplies low-frequency electric power to the high-pressure discharge lamp 13 alternately from the two sets of capacitors C1 and C2.

  FIG. 6 shows operating characteristics when a pulsed high voltage is applied from the igniter 16 when power is supplied from one of the two capacitors C1 and C2 in the conventional high pressure discharge lamp lighting device. FIG. The no-load output voltage VL0 to which the high-pressure discharge lamp 13 is not connected is such that the low-frequency voltage is alternately applied to the high-pressure discharge lamp 13 because the two capacitors C1 and C2 have the same capacity. Then, the pulsed high voltage PV is applied from the igniter 16 when power is supplied from one capacitor C2.

  Now, the voltage of the series circuit of the smoothing capacitors C1 and C2 is V1, the voltage of the smoothing capacitor C2 is V2, and at the time t1, t2, t3. It is assumed that the voltage PV is applied to the high pressure discharge lamp 13. In this case, when the high-pressure discharge lamp 13 is difficult to start due to product variations or end of life, the voltage V1 of the series circuit of the smoothing capacitors C1 and C2 is constant, but the voltage V2 of the capacitor C2 is pulsed. It decreases each time the high voltage PV is applied.

  This is because, when the pulsed high voltage PV is applied, the high-pressure discharge lamp 13 does not light up, but starts glow discharge and arc discharge and consumes the charge of the capacitor C2 for these discharges. is there. Therefore, the lamp voltage VLs at the time of start is that the voltage applied to the high-pressure discharge lamp 13 at the time t1 is V21, decreases to the voltage V22 in the next cycle, and further decreases to the voltage V23 in the next cycle. Decrease. As a result, the high-pressure discharge lamp 13 becomes more difficult to start. As described above, when the two sets of capacitors have the same capacity and the power is supplied from one of the two sets of capacitors, applying a pulsed high voltage from the igniter makes it difficult to start high voltage discharge. In the case of the lamp 13, it becomes more difficult to start.

  An object of the present invention is to provide a high-pressure discharge lamp lighting device and a high-pressure discharge lamp illumination device that can be stably started even if the high-pressure discharge lamp has deteriorated startability.

  The high-pressure discharge lamp lighting device according to the invention of claim 1 includes two sets of capacitors connected in series to a DC power source obtained by rectifying a commercial AC power source; and connected in parallel to the capacitors connected in series. And a pair of switching elements connected in series with each other; an auxiliary power supply circuit that is connected to at least one capacitor and replenishes the charge of the capacitor; and connected between a connection point of two sets of capacitors and a connection point of the switching element A high-pressure discharge lamp and a load circuit to which an igniter that generates a pulsed high voltage capable of starting the high-pressure discharge lamp is connected; voltage detection means for detecting a voltage supplied to the load circuit; and voltage reduction by the voltage detection means And a control means for supplying the charge of the auxiliary power supply circuit to the capacitor by detecting.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

  Two sets of capacitors connected in series are power supply smoothing capacitors connected in parallel to a DC power source obtained by rectifying a commercial AC power source, and charge is accumulated from the DC power source. Low-frequency power is supplied to the high-pressure discharge lamp alternately from the two sets of capacitors by two regulators.

  The paired switching elements are connected in parallel to the two sets of capacitors connected in series and connected in series to each other, and are turned on and off at a low frequency to alternately switch the low frequency from the two sets of capacitors to the high-pressure discharge lamp. Supply power.

  The load circuit is formed by connecting a high-pressure discharge lamp and an igniter in parallel between the connection points of the two sets of capacitors and the connection points of the switching elements. The high-pressure discharge lamp is a mercury lamp, a metal halide lamp, a high-pressure sodium lamp, or the like, and a ceramic discharge lamp using an alumina tube as an arc tube is allowed. The igniter is a high voltage generator that generates a pulsed high voltage necessary for starting the high pressure discharge lamp when starting the high pressure discharge lamp.

  The auxiliary power supply circuit is connected to at least one capacitor and replenishes the charge of the capacitor. When the igniter generates a pulsed high voltage necessary for starting the high-pressure discharge lamp, the auxiliary power supply circuit Replenish charge.

  The control means supplies the electric charge of the auxiliary power supply circuit to the capacitor when the voltage detection means for detecting the voltage supplied to the load circuit detects the voltage drop. When the high pressure discharge lamp is lit, the igniter and the auxiliary power circuit are stopped. As a result, it is possible to compensate for the consumption of the capacitor charge due to glow discharge and arc discharge until the high pressure discharge lamp is turned on.

  According to a second aspect of the present invention, there is provided a high pressure discharge lamp lighting device according to the first aspect of the present invention, wherein the igniter generates a high voltage only when one of the two capacitors is operating. An auxiliary power circuit is connected to the capacitor.

  In the present invention, a high voltage is generated only when one of the two capacitors is operating. That is, of the two sets of capacitors at the time of starting the high-pressure discharge lamp, the charge of the capacitor on the side where the pulsed high voltage from the igniter is superimposed is supplemented.

  As a result, power can be supplied only from one of the two sets of capacitors, so the burden on the igniter can be reduced.

  An illumination device for a high pressure discharge lamp according to a third aspect of the invention comprises the high pressure discharge lamp lighting device according to the first or second aspect; a high pressure discharge lamp that is lit by the high pressure discharge lamp lighting device; and the high pressure discharge lamp is mounted. And a lighting fixture main body.

  According to the present invention, an illumination device for a high pressure discharge lamp having the effect of any one of claims 1 and 2 is obtained.

  According to the first aspect of the present invention, it is possible to compensate for the consumption of electric charges of the capacitor due to glow discharge and arc discharge until the high pressure discharge lamp is turned on. Even a high-pressure discharge lamp whose startability has deteriorated immediately before can be started and lit stably.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, since power can be supplied only from one of the two sets of capacitors, the operation of the igniter can be halved and the burden on the igniter can be reduced. it can. Moreover, according to the invention of Claim 3, the illuminating device for a high-pressure discharge lamp having the effect of any one of Claims 1 and 2 is obtained.

(First embodiment)
FIG. 1 is a circuit configuration diagram of a high-pressure discharge lamp lighting device according to a first embodiment of the present invention. This first embodiment is different from the conventional example shown in FIG. 5 in that the capacitor C2 on the side of superposing the pulsed high voltage from the igniter 16 out of the two sets of capacitors C1 and C2 when the high pressure discharge lamp 13 is started. A supplementary power supply circuit 17 for replenishing the electric charge, and a lighting detection and C2 voltage detection circuit 18 for detecting that the high-pressure discharge lamp 13 is lit and a voltage of the capacitor C2 are additionally provided. Detects the voltage of the capacitor C2 at the start of the high-pressure discharge lamp 13 and connects the auxiliary power circuit 17 to the capacitor C2 when the voltage is lower than the set value, and turns on the high-pressure discharge lamp 13 or the voltage of the capacitor C2. Is supplemented to the set value, the connection with the capacitor C2 is cut off.

  In FIG. 1, a DC power supply 11 is boosted by a boost chopper circuit 12. The step-up chopper circuit 12 includes a reactor L1, a switch S1, a diode D1, and a pair of capacitors C1 and C2. That is, the boost chopper circuit 12 connects the reactor L1 and two sets of capacitors C1 and C2 in series to the DC power source 11 via the diode D1, and connects the switching element S1 in parallel between the reactor L1 and the diode D1. Formed. When switching element S1 is turned on, electromagnetic energy is accumulated in reactor L1, and when switching element S1 is turned off, power is supplied to two sets of capacitors C1 and C2 from both DC power supply 11 and reactor L1. Two sets of capacitors C1 and C2 are power supply smoothing capacitors, and a power source obtained by boosting the DC power source 11 is accumulated. Low frequency power is supplied from the two sets of capacitors C1 and C2 to the high-pressure discharge lamp 13 of the load circuit 24 alternately via the filter capacitor C4 by the two regulators 15a and 15b. The load circuit 24 is formed by connecting the high-pressure discharge lamp 13 and the igniter 16 in parallel between the connection point of the two sets of capacitors C1 and C2 and the connection point of the switching elements S2a and S2b.

  The regulator 15a includes a switch S2a, a diode D2a, and a reactor L2. Similarly, the regulator 15b includes a switch S2b, a diode D2b, and a reactor L2.

  The control circuit 14 performs frequency control and PWM control of the two regulators 15a and 15b, and supplies a low-frequency power to the high-pressure discharge lamp 13 from the two sets of capacitors C1 and C2 of the boost chopper circuit 12 via the filter capacitor C2. At the same time, a pulsed high voltage is applied from the igniter 16 when the high-pressure discharge lamp 13 is started.

  The auxiliary power supply circuit 17 includes a resistor R, a diode D3, a capacitor C3, a constant voltage diode ZD, a diode D4, and a changeover switch S3, and stores power from the DC power supply 11 to the capacitor C3. The electric charge stored in the capacitor C3 is supplied to the capacitor C2 on which the pulsed high voltage from the igniter 16 is superimposed. The constant voltage diode ZD is provided to hold the voltage across the capacitor C3 at a constant voltage.

  Since the high-pressure discharge lamp 13 is not lit when the high-pressure discharge lamp 13 is started, the lighting detection and C2 voltage detection circuit 18 is inoperative and the changeover switch S3 is closed. Therefore, when the voltage V2 of the capacitor C2 decreases at the time of starting the high-pressure discharge lamp 13, electric charge is replenished from the capacitor C3 to the capacitor C2 via the diode D3 and the changeover switch S3.

  FIG. 2 shows a pulse-like height from the igniter 16 when power is supplied from one of the two capacitors C1 and C2 in the high pressure discharge lamp lighting device according to the first embodiment of the present invention. It is an operating characteristic figure at the time of applying a voltage. The no-load output voltage VL0 to which the high-pressure discharge lamp 13 is not connected is such that the two sets of capacitors C1 and C2 have the same capacity, and thus the low-frequency voltage is alternately applied to the high-pressure discharge lamp 13. Then, the pulsed high voltage PV is applied from the igniter 16 when power is supplied from one capacitor C2.

  When the high voltage discharge lamp 13 is connected and the pulsed high voltage PV is applied, the high pressure discharge lamp 13 does not light up, but starts glow discharge and arc discharge, and the capacitor C2 is used for these discharges. Consume the charge. Therefore, when the arc discharge of the high-pressure discharge lamp 13 does not continue, during the period from the time t1, t2, t3... When the pulsed high voltage PV is applied from the igniter 16 to the high-pressure discharge lamp 13 until the high-frequency voltage is inverted, the capacitor C2 The voltage V2 tends to decrease each time the pulsed high voltage PV is applied.

  In the first embodiment, when the voltage V2 of the capacitor C2 is to be lowered, the capacitor C3 of the auxiliary power supply circuit 17 supplies electric charge to the capacitor C2, so that the voltage V2 of the capacitor C2 is almost equal as shown in FIG. Held constant. Accordingly, the lamp voltage VLs at the time of starting does not decrease every time the pulsed high voltage PV is applied, and is almost V21 at the time points t1, t2, t3... When the pulsed high voltage PV is applied to the high pressure discharge lamp 13. A constant value.

  According to the first embodiment, it is possible to compensate for the consumption of electric charges of the capacitor due to glow discharge and arc discharge until the high pressure discharge lamp 13 is turned on, so that the lamp voltage VLs at the start is kept at a constant value. be able to. From this, even if the high-pressure discharge lamp 13 is deteriorated in startability immediately before the manufacturing variations of the high-pressure discharge lamp or just before the end of the life of the high-pressure discharge lamp 13, it can be started stably.

(Second Embodiment)
FIG. 3 is a flowchart showing the operation of the high-pressure discharge lamp lighting device according to the second embodiment of the present invention. In the second embodiment, when the high-pressure discharge lamp 13 is turned on, the rated lighting is continued until the high-pressure discharge lamp 13 is lit, and then the dimming control is performed. .

  Usually, the abnormality of the high-pressure discharge lamp 13 is determined based on whether or not the lamp voltage VL is within a predetermined range with reference to the lamp voltage VL during normal lighting. Similarly, for the high-pressure discharge lamp 13 under dimming control, an abnormality is determined based on whether the lamp voltage VL is within a predetermined range with reference to the lamp voltage VL during normal lighting in the dimming controlled state. Like to do.

  When the high-pressure discharge lamp 13 is dimmed and controlled, the discharge phenomenon of the high-pressure discharge lamp 13 may become unstable if it is lit in the dimming-controlled state from the start. In particular, the lamp voltage VL may deviate from a predetermined range. In particular, from the time when the power is turned on until the high-pressure discharge lamp is steadily lit at an arbitrary set output, it is easily affected by variations in the manufacturing and use conditions of the high-pressure discharge lamp 13, and therefore detection of abnormality detection is anticipated. Level setting is required. In addition, the lamp recommendation includes a detection setting level for detecting an abnormality only when rated lighting is performed, and dimming lighting is a determination based on a combination with an electronic ballast.

  Therefore, the rated lighting is performed until the high-pressure discharge lamp 13 is stably lit after turning on the power, and the abnormality is determined in the rated lighting state.

  In FIG. 3, the high pressure discharge lamp is started (S1), and it is determined whether or not the high pressure discharge lamp 13 is turned on by the start operation (S2). When the high pressure discharge lamp 13 is lit, the rated lighting is continued for a certain time (S3), and it is determined whether the lamp voltage VL is within a predetermined range (S4). When the lamp voltage Vl of the high pressure discharge lamp 13 is not within the predetermined range, it is determined that the high pressure discharge lamp 13 is abnormal, and the high pressure discharge lamp 13 is turned off (S5). On the other hand, when the lamp voltage Vl is within the predetermined range, it is determined whether there is a dimming signal (S6), and when there is a dimming signal, dimming lighting is performed by dimming control (S7). When there is no dimming signal, the normal lighting is continued (S8). In this way, since the dimming control is performed after the lighting state of the high-pressure discharge lamp 13 becomes a stable and stable lighting state, the abnormality determination level is set (lamp recommendation) so that the abnormality of the high-pressure discharge lamp 13 can be easily detected. Is possible).

  According to the second embodiment, in addition to the effects of the first embodiment, the high-pressure discharge lamp 13 is determined to be abnormal by continuing the rated lighting for a certain period after the power is supplied to the high-pressure discharge lamp. Even in a high-pressure discharge lamp that performs dimming control, it is possible to easily detect an abnormality.

(Third embodiment)
FIG. 4 is an explanatory diagram of an illumination device for a high-pressure discharge lamp according to a third embodiment of the present invention. The high-pressure discharge lamp lighting device 19 according to the first embodiment or the second embodiment constitutes a high-pressure discharge lamp illumination device together with the fixture body 20 to which the high-pressure discharge lamp 13 is attached. As shown in FIG. 4, the high-pressure discharge lamp 13 is mounted on the socket 21 of the instrument body 20 and is lit by the high-pressure discharge lamp lighting device 19. The light from the lit high-pressure discharge lamp 13 is reflected by the front reflector 22 and emitted through the front glass 23. According to the illumination device for a high pressure discharge lamp of the third embodiment, the illumination device for a high pressure discharge lamp having the effect of the high pressure discharge lamp lighting device 19 in the first embodiment or the second embodiment is obtained. It is done.

The circuit block diagram of the high pressure discharge lamp lighting device concerning the 1st Embodiment of this invention. The operation characteristic view at the time of applying a pulse-like high voltage from an igniter when power is supplied from one capacitor of two sets in the high pressure discharge lamp lighting device of a 1st embodiment of the present invention. The flowchart which shows operation | movement of the high pressure discharge lamp lighting device concerning the 2nd Embodiment of this invention. Explanatory drawing of the illuminating device for high pressure discharge lamps concerning the 3rd Embodiment of this invention. The circuit block diagram in the conventional high pressure discharge lamp lighting device. The operation characteristic view at the time of applying a pulse-like high voltage from an igniter when power is supplied from one capacitor of two sets with the conventional high-pressure discharge lamp lighting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... DC power supply, 12 ... Boost chopper circuit, 13 ... High pressure discharge lamp, 14 ... Control circuit, 15 ... Regulator, 16 ... Igniter, 17 ... Auxiliary power supply circuit, 18 ... Lighting detection and C2 voltage detection circuit, 19 ... High pressure discharge Lamp lighting device, 20 ... fixture body, 21 ... socket, 22 ... reflector, 23 ... front glass, 24 ... load circuit

Claims (3)

Two sets of capacitors connected in series to a DC power source obtained by rectifying a commercial AC power source;
A pair of switching elements connected in parallel to the capacitors connected in series and connected in series with each other;
An auxiliary power circuit connected to at least one capacitor and replenishing the charge of the capacitor;
A load circuit connected between a connection point of two sets of capacitors and a connection point of a switching element and connected to an igniter that generates a pulsed high voltage capable of starting the high pressure discharge lamp and the high pressure discharge lamp;
Voltage detecting means for detecting a voltage supplied to the load circuit;
Control means for supplying the charge of the auxiliary power supply circuit to the capacitor by detecting a voltage drop by the voltage detection means;
A high-pressure discharge lamp lighting device comprising:   2. The high voltage discharge according to claim 1, wherein the igniter generates a high voltage only when one of the two capacitors is operating, and an auxiliary power supply circuit is connected to the capacitor. Lamp lighting device. A high pressure discharge lamp lighting device according to claim 1 or 2;
A high pressure discharge lamp to be lit by the high pressure discharge lamp lighting device;
A lighting fixture body to which the high-pressure discharge lamp is mounted;
An illumination device for a high-pressure discharge lamp, comprising:

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