JP2000012263A - Discharge lamp lighting device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device stably operable even in either state. SOLUTION: In a direct current of a DC power source E, a drive circuit 12 alternately turns on and off electric field effect transistors Q1, Q2 according to a control circuit 15, and an inverter circuit 11 outputs a high frequency to start/light fluorescent lamps FL1, FL2. Until the fluorescent lamps FL1, FL2 are started, lamp voltage of the fluorescent lamps FL1, FL2 is detected by a voltage detecting circuit 16 to be controlled so that output voltage of the inverter circuit 11 becomes constant, and a phase is made different from lighting time of the fluorescent lamps FL1, FL2. When the fluorescent lamps FL1, FL2 are lighted, an electric current value flowing to the electric field effect transistor Q2 is detected by an electric current detecting resistance R1 to be controlled so that the electric current value becomes constant, and the phase is adjusted so as to become different from when the fluorescent lamps FL1, FL2 are activated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting a discharge lamp and a lighting device.

[0002]

2. Description of the Related Art Conventionally, as a discharge lamp lighting device of this type, in a lamp starting mode at the time of generating a starting voltage for starting a discharge lamp, a control circuit controls the output voltage of an inverter circuit to be constant by feeding back the discharge lamp. In the lamp lighting mode after lighting, the lamp current or the lamp power is controlled to be constant.

[0003] The lamp lighting mode of the discharge lamp also has an all-light lighting mode in which the discharge lamp is all-lighted and a dimming lighting mode in which the discharge lamp is lighted by dimming.

[0004]

However, when control is performed by feedback, the phases are different between the lamp starting mode and the lamp lighting mode, and between the all-light lighting mode and the dimming lighting mode, and the phase and gain are not appropriate. In this case, the output becomes unstable, the envelope becomes unstable, and the crest factor decreases.

The present invention has been made in view of the above problems, and has as its object to provide a discharge lamp lighting device and a lighting device which can operate stably in any state.

[0006]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device for lighting a discharge lamp;
Control means for controlling the discharge lamp lighting circuit by controlling the output voltage to be constant when a discharge lamp starting voltage is generated, and controlling either the lamp current or the lamp power to be constant after the discharge lamp is turned on; feedback for adjusting the feedback phase The phase adjusting means adjusts the feedback phase by the feedback phase adjusting means, so that the phase becomes appropriate and the operation is stabilized.

According to a second aspect of the present invention, there is provided a discharge lamp lighting device according to the first aspect, wherein the feedback phase adjusting means changes the capacitance of the capacitor. Adjust the feedback phase.

According to a third aspect of the present invention, there is provided the discharge lamp lighting device according to the first or second aspect, wherein the feedback phase adjusting means adjusts the phase before and after the discharge lamp is lit. The phases are adjusted before and after lighting, respectively, and in any case, the phase becomes appropriate and the operation is stabilized.

According to a fourth aspect of the present invention, there is provided the discharge lamp lighting device according to any one of the first to third aspects, wherein the control means controls the discharge lamp to perform all-light lighting and dimming lighting of the discharge lamp. The feedback phase adjusting means adjusts the phase at the time of all-light lighting of the discharge lamp and at the time of dimming lighting, and adjusts the phase at the time of all-light lighting of the discharge lamp and at the time of dimming lighting, In either case, the phase is appropriate and the operation is stable.

According to a fifth aspect of the present invention, there is provided an illuminating apparatus comprising: a fixture main body to which a discharge lamp is mounted; and a discharge lamp lighting apparatus according to any one of the first to fourth aspects, for lighting the discharge lamp. Play.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention.

FIG. 3 is a perspective view showing the external appearance of the lighting device. The fixture body 1 is an inverted Fuji type, and has reflection surfaces 2 and 2 on the lower surface. These reflection surfaces 2 have lamp sockets 3 and 3 at both ends. The fluorescent lamps FL1 and FL2 serving as discharge lamps serving as loads are electrically and mechanically mounted between the lamp sockets 3 and 3, respectively, and the discharge lamp lighting device shown in FIG. ing.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device. In the discharge lamp lighting device shown in FIG. 1, an inverter circuit 11 as a discharge lamp lighting circuit is connected to a DC power supply E. Has a field effect transistor Q1, a field effect transistor Q2, and a current detecting resistor R1 connected in series.

Further, these field-effect transistors Q1, Q1
Q2 is connected to a drive circuit 12 via resistors R2 and R3, and the drive circuit 12 is connected to a control circuit 15 as control means.

Further, the connection point of the field effect transistor Q1 and the field effect transistor Q2 is connected through a series circuit of a DC cut capacitor C1 and a choke coil L1.
One end of the balancer L2 is connected to one end of one filament FL1a of the fluorescent lamp FL1, and the other end of the other filament FL1b of the fluorescent lamp FL1 is connected to the negative electrode of the DC power supply E. ing. Further, the other end of the balancer L2 is connected to one filament of the fluorescent lamp FL2.
The other end of the other filament FL2b of the fluorescent lamp FL2 is connected to the negative terminal of the DC power supply E.

Further, the filament FL of the fluorescent lamp FL1
A starting capacitor C2 is connected between the other ends of 1a and FL1b, and a starting capacitor C3 is connected between the other ends of the filaments FL2a and FL2b of the fluorescent lamp FL2.

Also, the fluorescent lamp FL1 via the balancer L2
, FL2 is connected in parallel with the voltage detection circuit 16.

The control circuit 15 is connected to the current detection resistor R1 and the voltage detection circuit 16.

FIG. 2 is a circuit diagram showing a control circuit. The control circuit 15 shown in FIG.
Is connected to one input terminal of an operational amplifier 22 via a series circuit of a diode D1 for backflow prevention, and the voltage detection terminal is connected to an input terminal of one end of the operational amplifier 22 via a series circuit of an amplifier 23 and a diode D2 for backflow prevention. The reference voltage source E1 is connected to the other input terminal of the operational amplifier 22.

Further, a feedback phase adjusting means 24 is connected to an output terminal of the operational amplifier 22. This feedback phase adjusting means 24 is grounded to the output terminal of the operational amplifier 22 via the capacitor C5 and the field effect transistor Q5, and is grounded via the capacitor C6, and the gate of the field effect transistor Q5 is connected to the voltage detection terminal. Have been.

The output terminal of the operational amplifier 22 is a VFO
25, an output terminal is connected to the output side of the VFO 25, and a resistor R5 and a capacitor C7 are connected to the VFO 25.
RC time constant circuit is connected.

Next, the operation of the above embodiment will be described.

First, the drive circuit 12 alternately turns on and off the field effect transistor Q1 and the field effect transistor Q2 according to the control circuit 15 according to the control circuit 15, and the inverter circuit 11 outputs high frequency, the capacitor C1 and the choke coil. The fluorescent lamps FL1 and FL2 are started by resonance of L1, the capacitor C2 or the capacitor C3, etc., and the fluorescent lamps FL1 and FL
After the start of 2, the currents are made equal by the balancer L2 to turn on the fluorescent lamps FL1 and FL2.

Until the fluorescent lamps FL1 and FL2 start, the voltage detection circuit 16 detects the lamp voltages of the fluorescent lamps FL1 and FL2 and outputs the VFO 25 so that the output voltage of the inverter circuit 11 becomes constant. The output of the inverter circuit 11 changes to control the output of the voltage detection circuit 16, and the output of the voltage detection circuit 16 is applied to the gate of the field-effect transistor Q5. Adjust the phase so that it is different from when the fluorescent lamps FL1 and FL2 are lit.

When the fluorescent lamps FL1 and FL2 are turned on, the output of the voltage detection circuit 16 disappears, and the current detection resistor R1
, And the current flowing through the field effect transistor Q2 is detected by the current detection resistor R1, and the output of the VFO 25 is changed so that the current value becomes constant.
The output of the voltage detection circuit 16 is no longer applied to the gate of the field effect transistor Q5, and the capacitor C5
Is electrically disconnected from the capacitor C6, the combined capacitance is reduced, and the phase is adjusted to be different from the starting time of the fluorescent lamps FL1, FL2.

After turning on the fluorescent lamps FL1 and FL2,
The same effect can be obtained not by controlling the lamp current value to be constant but by controlling the lamp power to be constant.

Also, in the lamp lighting mode, when there are an all-light lighting mode in which the discharge lamp is all-lighted and a dimming lighting mode in which the discharge lamp is lit and lit, the feedback phases are different from each other. Then, the phase of the feedback may be adjusted.

[0028]

According to the discharge lamp lighting device of the first aspect, the phase can be appropriately adjusted and the operation can be stabilized by adjusting the feedback phase by the feedback phase adjusting means.

According to the discharge lamp lighting device of the second aspect,
In addition to the discharge lamp lighting device according to the first aspect, the feedback phase adjusting means changes the capacitance of the capacitor, so that the feedback phase can be easily adjusted.

According to the discharge lamp lighting device of the third aspect,
In addition to the discharge lamp lighting device according to the first or second aspect, the feedback phase adjusting means adjusts the phase before and after lighting of the discharge lamp, so that the phase is appropriate in any case and the operation can be stabilized.

According to the discharge lamp lighting device of the fourth aspect,
In addition to the discharge lamp lighting device according to any one of claims 1 to 3, the phase is adjusted during all-light lighting and dimming lighting of the discharge lamp, and in any case, the phase becomes appropriate and the operation can be stabilized. .

According to the lighting device of the fifth aspect, since the discharge lamp lighting device of any one of the first to fourth aspects for lighting a discharge lamp is provided, the respective effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a discharge lamp lighting device of the present invention.

FIG. 2 is a circuit diagram showing a control circuit according to the first embodiment;

FIG. 3 is a perspective view showing an appearance of the lighting device.

[Explanation of symbols]

 1 Apparatus body 11 Inverter circuit as discharge lamp lighting circuit 15 Control circuit as control means 24 Feedback phase adjusting means FL1, FL2 Fluorescent lamp as discharge lamp

Continued on the front page (72) Inventor Keiichi Shimizu 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation (72) Inventor Kazutoshi Mita 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology F term in the company (reference) 3K072 AA02 AB02 BA03 BC01 BC03 DB03 DC02 DD04 EB05 EB06 GA03 GB12 GC04 HB03

Claims (5)

[Claims] A discharge lamp lighting circuit for lighting a discharge lamp; a discharge lamp having a constant output voltage when a starting voltage of the discharge lamp is generated; and a constant control of either the lamp current or the lamp power after the discharge lamp is turned on. A discharge lamp lighting device comprising: control means for controlling a lighting circuit; and feedback phase adjusting means for adjusting a feedback phase. 2. The discharge lamp lighting device according to claim 1, wherein the feedback phase adjusting means changes the capacitance of the capacitor. 3. The discharge lamp lighting device according to claim 1, wherein the feedback phase adjustment means adjusts the phase before and after lighting the discharge lamp. 4. The control means controls a discharge lamp lighting circuit so as to light the discharge lamp with all light and dimming light, and the feedback phase adjusting means controls a phase between when the discharge lamp is lighted with all light and when light is dimmed. The discharge lamp lighting device according to any one of claims 1 to 3, wherein the value is adjusted. 5. A lighting device comprising: a fixture main body to which a discharge lamp is mounted; and the discharge lamp lighting device according to claim 1 for lighting the discharge lamp.