JP3846622B2 - Lighting device and lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device for lighting a high-pressure discharge lamp and a lighting device using the lighting device.
[0002]
[Prior art]
High-pressure discharge lamps, particularly metal halide lamps and high-pressure sodium lamps, have a very high starting voltage, and are usually lit by applying a high-pressure pulse.
[0003]
There are two methods of applying such a high-pressure pulse: a method of providing a starter circuit inside the lighting device and a method of providing a starter inside the outer tube of the high-pressure discharge lamp.
[0004]
A method of providing a starting circuit inside the lighting device is, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-51896, in which a commercial AC power source is converted into a direct current and then converted into a rectangular wave of a desired frequency at a discharge lamp and Disclosed is a discharge lamp lighting device (prior art 1) in which a pulse transformer is connected in series and a high-pressure pulse is generated in a discharge lamp in cooperation with a capacitor and switch means connected to the primary side of the pulse transformer. Yes.
[0005]
In addition, as an example of providing a starter inside the outer tube of the high-pressure discharge lamp, for example, Japanese Patent No. 2602647 contains a starter including a resistor, a lighting tube, and a bimetal in parallel with the arc tube and the arc tube inside the outer tube. A metal vapor discharge lamp (prior art 2) is described.
[0006]
[Problems to be solved by the invention]
By the way, in recent years, the base of the lamp has become common, and there is a possibility that the lamp is erroneously mounted.
[0007]
In particular, when a discharge lamp having a built-in starter as in Prior Art 2 is mounted on a discharge lamp lighting device as in Prior Art 2, the start is built in the outer tube by a high-pressure pulse output from the discharge lamp lighting device. There is a risk of damage to the vessel. Furthermore, if the starter is damaged, the parts of the starter may scatter and the outer tube may burst.
[0008]
Further, in recent years, the lighting devices that can realize light weight and can suppress the flickering of the high-pressure discharge lamp are being digitized. However, a lighting device using such an electronic circuit cannot generate a high-pressure pulse even if a starter built in a conventional high-pressure discharge lamp is used, and the high-pressure discharge lamp cannot be lit.
[0009]
The present invention provides a lighting device capable of lighting a high-pressure discharge lamp without causing the above-described problems even with a lamp having a built-in starter, and with or without the starter. An object of the present invention is to provide an illumination device using the high pressure discharge lamp lighting device.
[0010]
[Means for Solving the Problems]
The lighting device according to the first aspect of the present invention includes a lighting circuit for stably lighting a high-pressure discharge lamp, high-pressure pulse generating means for generating a high-pressure pulse to light the high-pressure discharge lamp, and housed in the outer tube and the outer tube. In order to determine whether or not there is a starter in the outer tube of a high-pressure discharge lamp having a light-emitting tube and that is arranged in parallel with the light-emitting tube and includes a thermal response switch, there is a secondary current after the power is turned on. When it is determined that there is a starter, the operation of the high voltage pulse generation circuit is permitted only when the operation of the high voltage pulse generation means is stopped and then the thermal response switch dissociates and the secondary current of the lighting circuit stops flowing. , when it is determined that there is no high-pressure discharge lamp inside starter by the secondary current is not after power-on determining means for permitting operation of high-voltage pulse generating circuit; equipped with a And wherein the door.
[0011]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0012]
The high-pressure discharge lamp allows a mercury lamp, a metal halide lamp, a high-pressure sodium lamp, a ceramic metal halide lamp, and the like in which an arc tube is housed in an outer tube. A cap is attached to one end or both ends of the outer tube to supply power to the arc tube. The arc tube includes a known arc tube of the high-pressure discharge lamp, and has a configuration in which, for example, a pair of electrodes and electrodes are sealed to have an airtight discharge space.
[0013]
The starter housed in the outer tube and electrically connected in parallel with the arc tube is composed of a series circuit of a heat responsive switch, a glow starter, and a heating resistor. Recently, a starter using a semiconductor element is used instead of the glow starter. In common with these starters, it is indispensable that a thermally responsive switch is connected in series to electrically disconnect the glow starter after the arc tube is lit.
[0014]
The discriminating circuit discriminates based on the secondary current or the secondary voltage when the lighting circuit is turned on. In other words, when a high-pressure discharge lamp with a built-in starter is connected to the secondary side of the lighting circuit, the starter is connected in parallel with the arc tube, so a current flows through the starter or the voltage at the starter It can be determined by descent. In addition, when a high-pressure discharge lamp without a built-in starter is connected, since the arc tube is not energized, the secondary current of the lighting circuit does not flow, and no voltage drop occurs. ing.
[0015]
The high-voltage pulse generating means is composed of a pulse transformer, a switch means, etc. connected in series or in parallel with the high-pressure discharge lamp, and generates high-pressure pulses using the no-load secondary voltage of the lighting circuit as a power source. It has a function of starting and lighting by applying a high voltage generated by series resonance of an inductance and a capacitor using a secondary voltage as a power source to a high pressure discharge lamp via a pulse transformer.
[0016]
The lighting circuit includes a DC circuit, a chopper circuit, a polarity inversion circuit, and the like.
[0017]
The DC circuit includes a circuit that obtains a DC power source by rectifying and smoothing a DC power source such as a battery or a commercial AC power source. The chopper circuit allows the step-up chopper and the step-down chopper and supplies a desired secondary voltage to the high-pressure discharge lamp. The polarity inversion circuit allows a full-bridge circuit and a half-bridge circuit to be configured, and a field effect transistor (FET) or the like can be used as a switching element that configures these.
[0018]
To determine the presence or absence of the outer tube inside the starter of the high-pressure discharge lamp by determine by means, when starter was high-pressure discharge lamp that has not been built only have to turn on the high-pressure lamp by generating a high voltage pulse . For this reason, even if a high-pressure discharge lamp with a built-in starter is mistakenly inserted, a high-pressure pulse is applied only when the starter is not built-in. It is possible to suppress breakage of the outer tube due to breakage of the starter.
[0019]
[0020]
The secondary current of the lighting circuit is detected by providing a resistance for current detection on the secondary side of the lighting circuit, or when an alternating current is output when a polarity inversion circuit is attached to the lighting circuit. ) Can be detected.
[0021]
According to the present invention, the presence or absence of the starter can be determined based on the presence or absence of the output current of the lighting circuit.
[0022]
[0023]
A high-pressure discharge lamp with a built-in starter starts with a built-in heating resistor to prevent the high-pressure pulse from being applied to the high-pressure discharge lamp for a long time when the arc tube does not light due to its normal life. Many have the function of dissociating the thermo-responsive switch of the vessel. For this reason, if a secondary current continues to be applied to a high-pressure discharge lamp having such a built-in starter, the heat-responsive switch of the starter is overheated and the heat-sensitive switch is dissociated, thereby interrupting the secondary current. . At this time, by generating a high-pressure pulse from the lighting device, a high-pressure discharge lamp having such a built-in starter can be lit.
[0024]
According to the present invention, even when a high-pressure discharge lamp having a built-in starter is erroneously inserted, it is determined that the heat-responsive switch of the starter is dissociated by continuing to supply a secondary current to the starter. Since a high-pressure pulse for lighting the high-pressure discharge lamp can be applied, even if a high-pressure discharge lamp with a built-in starter is accidentally inserted, the high-pressure discharge lamp can be operated without damaging the starter. It can be lit.
[0025]
Billing illumination device of the present invention in a second aspect, a lighting apparatus main body; are provided with; and lighting device of the lighting apparatus according to claim 1, wherein supported by the body.
[0026]
In the present invention, an illuminating device means any device that utilizes the light emitted from a high-pressure discharge lamp, and includes, for example, a lighting device such as a projector, a road, a tunnel , and a liquid crystal, and a street light.
[0027]
According to the present invention, it is possible to provide an illuminating device having the effect of claim 1.
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a lighting device of the present invention will be described with reference to the drawings.
[0028]
In the lighting circuit diagram of FIG. 1, a rectifier circuit 2, a step-up chopper 3, a step-down chopper 4, and a load circuit 5 are sequentially connected to the secondary side of the AC power supply 1.
[0029]
The AC power source 1 is a commercial 200V AC power source.
[0030]
Although not shown, the rectifier circuit 2 includes a noise prevention circuit, a bridge-type full-wave rectifier circuit, a smoothing circuit, etc., and rectifies commercial AC power and outputs DC power.
[0031]
Although not shown, the boost chopper 3 includes an inductance, a diode, a capacitor, a switching element, and the like, and boosts the voltage rectified by the rectifier circuit 2 to a predetermined boost ratio.
[0032]
The step-down chopper 4 is composed of a field-effect transistor (FET) and an inductance connected in series, a diode connected between the FET and the inductance, and the other end of the output of the step-up chopper 4, and a DC voltage boosted by the step-up chopper Is reduced to a desired voltage. In addition, in order to prevent flickering during lighting of the high-pressure discharge lamp, it has a function of superimposing a high frequency on the DC voltage by switching the FET.
[0033]
A voltage detection voltage dividing resistor is connected to the other end of the inductance and the negative end of the diode, which are the output ends of the step-down chopper. By controlling the switching of the FET with the voltage detected by the voltage dividing resistor, the control means 61 controls the desired voltage to be supplied to the high-pressure discharge lamp.
A load circuit 5 including a high-pressure discharge lamp DL is configured at the output terminal of the step-down chopper 4. The load circuit 5 is connected to the full bridge circuit 51 composed of four field effect transistors (FETs) Q1, Q2, Q3, and Q4 and the output terminal of the full bridge circuit 51 as a polarity inversion circuit, and generates a high voltage pulse. The high-pressure discharge lamp DL is connected in series with the starting circuit 52 and the pulse transformer PT. In the starting circuit 52, an inductance L2 also serving as a pulse transformer PT, a capacitor C1, and a bidirectional thyristor S are connected in series, and a series circuit of a resistor R3 and a diode D2 is connected in parallel with the bidirectional thyristor S. It is configured.
[0035]
When Q1 and Q3 of the FET of the full bridge circuit 51 are turned on and Q2 and Q4 are turned off, a DC voltage appears at the output terminal of the full bridge circuit 51, then Q1 and Q3 are turned off, and Q2 and Q4 are turned on. In this case, a reverse voltage appears.
[0036]
The start circuit 52 is energized when the full bridge circuit 51 operates and the switch means SW is turned on, and a high voltage pulse is passed through the pulse transformer PT by the series resonance of the inductance L3 and the capacitor C1 and the switching action of the bidirectional thyristor S. Is applied to the high-pressure discharge lamp DL. Further, a noise prevention capacitor C2 is connected in parallel with the starting circuit 52.
[0037]
A current detection element R0 is disposed between the full bridge circuit 51 and the step-down chopper circuit 4, and when the full bridge circuit 51 is operating, the presence or absence of a secondary current is detected and output to the determination means 62. When the secondary current is flowing by the discriminating means 62, the power supply of the switch means is turned off, and the switch means is turned on only when there is no secondary current.
[0038]
The control means 6 uses a microcomputer. The power of the control means 61 is supplied from the output of the step-up chopper 3 via a transformer (not shown). Further, by inputting the output of the step-down chopper 5 to the control means 61 via the voltage dividing resistor R2, the presence / absence of lighting of the high-pressure discharge lamp DL and the abnormality / normality of the power supply voltage 1, the step-up chopper 3 and the step-down chopper 4 are detected. is doing. The control means 61 controls the switching of each FET Q1, Q2, Q3, Q4 by outputting a signal to the gate of each field effect transistor (FET) Q1, Q2, Q3, Q4 of the full bridge circuit 51. Thus, the operation of the full bridge circuit 51 is controlled.
[0039]
FIG. 2 shows a configuration example of a high-pressure discharge lamp connected to the lighting circuit. (A) shows an example of a metal halide lamp without a built-in starter, and (b) shows an example of a metal halide lamp with a built-in starter using a lighting tube.
[0040]
In FIG. 2A, B indicates a lighting device, and DL is a metal halide lamp that is a high-pressure discharge lamp connected to the output terminal of the lighting device B. The high-pressure discharge lamp DL accommodates the arc tube L inside the outer tube DL1. The arc tube L is formed by sealing a pair of electrodes L1 and L2 and an auxiliary electrode L3 inside an arc tube L made of quartz glass. The auxiliary electrode L3 is disposed adjacent to the electrode L2 on one side of the arc tube L, and is electrically connected to the other electrode L1 via the current limiting resistor R1.
[0041]
In FIG. 2B, the starter ST is accommodated in the outer tube DL1. The starter ST is connected in parallel with the arc tube, and is constituted by a series connection of a heat responsive switch B, a glow starter G, and a heating resistor R2. The other end of the current limiting resistor R1 connected to the auxiliary electrode L3 is connected between the thermally responsive switch 6a and the glow starter G.
[0042]
The operation when a high-pressure discharge lamp without a built-in starter as shown in FIG. 2A is attached to the lighting device of this embodiment will be described.
[0043]
When the power is turned on, the voltage converted into an AC voltage by the polarity inversion circuit 51 rectified by the rectifier circuit 2 and inputted by the step-up chopper 3 and step-down chopper 4 to the polarity inversion circuit 51 is a high-pressure discharge lamp. Input to DL. Since no current flows through the high-pressure discharge lamp DL before lighting, no current is detected by the current detection element R0. The determination means 62 turns on the switch means SW after determining that no current flows through the current detection element R0. When the switch means SW is turned on, a current flows through the starting circuit 52, and a high-pressure pulse is applied to the high-pressure discharge lamp DL via the pulse transformer by the switching operation of the series resonant circuit of the inductance L3 and the capacitor C1 and the bidirectional thyristor S. The discharge lamp DL is lit.
[0044]
Next, the operation when the built-in high-pressure discharge lamp has a starter, such as shown in FIG. 2 (b) mounted on the lighting apparatus of this embodiment.
[0045]
A voltage that is turned on and converted into an AC voltage by the polarity inversion circuit 51 is input to the high-pressure discharge lamp DL. In the high-pressure discharge lamp DL, no current flows through the arc tube L before lighting, but since a current flows through the starter ST connected in parallel, the current is detected by the current detection element R0. Since the discriminating means 62 keeps the switch means SW off while the current flows through the current detection element R0, no high-voltage pulse is applied to the starter circuit 52 during this period because no current flows. For this reason, the high-pressure discharge lamp DL cannot be lit.
[0046]
Thereafter, since the starter ST built in the high-pressure discharge lamp DL continues to be energized, the heat responsive switch B is heated by the heating resistor R2 of the starter ST and the heat responsive switch B is opened. At this time, since the high-pressure discharge lamp DL is not energized, the current detection element R0 does not detect current. This state is discriminated by the discriminating means 62, and the switch means SW is turned on. When the switch means SW is turned on, a current flows through the starting circuit 52, and a high-pressure pulse is applied to the high-pressure discharge lamp DL via the pulse transformer PT by the switching operation of the series resonant circuit of the inductance L3 and the capacitor C1 and the bidirectional thyristor S. The high pressure discharge lamp DL is turned on.
[0047]
By operating in this way, even when a high pressure discharge lamp with a built-in starter is mounted on the lighting device of this embodiment, the high pressure discharge lamp can be lit without damaging the starter. Can do.
[0048]
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 shows the lighting device 7 that houses the lighting device 73 of the first embodiment. The illuminating device 7 includes a reflective shade 71, a socket 72, a lighting device 73, and the like. The metal halide lamp DL is used by being mounted on the socket 72 of the lighting device. The secondary output terminal of the lighting device 73 is connected to the socket 72 to supply power to the metal halide lamp DL. The lighting device 7 is supported by the ceiling surface 70.
[0049]
【The invention's effect】
According to the first aspect of the present invention, the determination means determines the presence or absence of a starter inside the outer tube of the high-pressure discharge lamp, and generates a high-pressure pulse only when the high-pressure discharge lamp has no built-in starter. The high pressure lamp is turned on. For this reason, even if a high-pressure discharge lamp with a built-in starter is mistakenly inserted, a high-pressure pulse is applied only when the starter is not built-in. It is possible to suppress breakage of the outer tube due to breakage of the starter.
[0050]
It is a more secure and easier to determine because it is determined in the presence of starter depending on the presence or absence of the output current of the lit circuit.
[0051]
Even if the startup device has built-in high-pressure discharge lamp is erroneously inserted, the thermally responsive switch of starter are determined from being dissociated by continuing flow of secondary current in starter, a high-pressure discharge The high-pressure pulse that turns on the lamp can be applied, so even if a high-pressure discharge lamp with a built-in starter is accidentally inserted, the high-pressure discharge lamp can be turned on without damaging the starter. It is.
[0052]
According to invention of Claim 2, the illuminating device which has the effect of Claim 1 can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic circuit diagram of a lighting device according to a first embodiment of the present invention.
FIG. 2 is a schematic circuit diagram of a high-pressure discharge lamp used in the lighting device according to the embodiment of the present invention.
FIG. 3 is a lighting device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Commercial AC power supply 2 ... Rectification circuit 3 ... Boost chopper 4 ... Buck chopper 5 ... Load circuit 51 ... Full bridge circuit 52 ... Start circuit DL ... High-pressure discharge lamp 62 ... Discriminating means R0 ... Current detection means SW ... Switch means

Claims (2)

A lighting circuit for stable lighting of the high-pressure discharge lamp;
High pressure pulse generating means for generating a high pressure pulse to light a high pressure discharge lamp;
In order to determine the presence or absence of a starter that is arranged electrically in parallel with the arc tube in the outer tube of the high-pressure discharge lamp having the outer tube and the arc tube housed in the outer tube, and after the power is turned on, When it is determined that there is a starter inside the high-pressure discharge lamp due to the current, the operation of the high-pressure pulse generation means is stopped, and then the secondary switch current stops flowing due to the dissociation of the thermal switch Only when the operation of the high-voltage pulse generation circuit is permitted, and when it is determined that there is no starter inside the high-pressure discharge lamp because there is no secondary current after turning on the power , ;
A lighting device comprising: An illuminating device comprising: an illuminating device main body; the lighting device according to claim 1 supported by the illuminating device main body; and a high-pressure discharge lamp that can be lit by the lighting device.

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