JPH05275184A - Electrodeless discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To provide an electrodeless discharge lamp lighting device, which can generate matching of a lamp with the lighting circuitry part and can light up the lamp in the optimum condition. CONSTITUTION:A coil for lighting up 19 is installed in the neighborhood of the body 22 of the discharge lamp, and DC power emitted from a power supply circuit 4 is supplied to a high frequency conversion circuit 9 to prepare a high frequency power supply. The power therefrom is supplied to a lighting circuitry part 21 including the said lighting coil 19, wherefrom a high frequency power is fed to the lamp body 22 in magnetical coupling, to light up an electrodeless discharge lamp 17. The arrangement is further equipped with a sensor circuit to sense the electric power given by the power supply circuit 4, a comparator circuit 29 to compare the sensing value from this sensor circuit with the reference value, and control circuits 32, 33 which generate matching of the high frequency power supply with the lamp load by the lighting circuitry part 21 on the basis of a comparison signal given by the comparator circuit 29 and make control so that the power fed to the lamp body 22 is always constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp lighting device for magnetically supplying electric power to a lamp from a coil wound around the discharge lamp, and more particularly to a high frequency power supply and a lamp load. And an electrodeless discharge lamp lighting device provided with a matching means for performing impedance matching with.

[0002]

2. Description of the Related Art In an electrodeless discharge lamp, the outer tube of a lamp body is formed of quartz glass into a spherical shape, and for example, krypton gas or NaI is enclosed in the lamp body. In this electrodeless discharge lamp, a coil is wound around the lamp body, and when power is supplied from the coil to the inside of the lamp body that is magnetically coupled, a plasma ring is formed in the lamp body and the lamp lights up. ..

In the conventional electrodeless discharge lamp, the lamp body and the coil are both fixed, and there is no one that can change the relative positions of these. In electrodeless discharge lamps, it is necessary to supply high kick-like energy for starting discharge into the lamp by the starter circuit when starting the lamp.
There is a conventional lighting device in which the circuit constants at the time of starting and at the time of normal lighting can be changed by switching a capacitor forming a resonance circuit with a switch or the like.

[0004]

However, in this electrodeless discharge lamp, the impedance matching between the high frequency power supply and the lamp load is deviated immediately after starting or due to a change over time. If the lamp is lit in the mismatched state, part of the input wave of the high frequency power supplied to the lamp side will return as a reflected wave, destroying the switching element of the high frequency converter and causing power loss. become.

The present invention has been proposed in order to solve the problems of the prior art as described above, and it is possible to match the high frequency power source and the lamp load and to turn on the lamp in the optimum state. It is an object of the present invention to provide an electrodeless discharge lamp lighting device capable of operating.

[0006]

In order to achieve this object, the present invention provides a high frequency power source by arranging a lighting coil in the vicinity of a lamp body and supplying a DC power source output from a power source circuit to a high frequency converter circuit. And supplying this high-frequency power source to a lighting circuit section having a resonance circuit consisting of a reactor including the above-mentioned lighting coil and a conductor, and in the discharge lamp body magnetically coupled from the lighting coil of this lighting circuit section. In a lighting device for inputting high-frequency power to light an electrodeless discharge lamp, a detection circuit for detecting the power output from the power supply circuit, a detection value output from the detection circuit, and a preset reference value Based on the comparison circuit for comparison and the comparison signal output from the comparison circuit, the lighting circuit unit matches the high frequency power source with the lamp load, and the lamp body Power input is always configured to include a control circuit for controlling such that the constant.

In the electrodeless discharge lamp lighting device according to the present invention, an input power detection circuit for detecting the power input to the high frequency conversion circuit and an output power detection circuit for detecting the power output from the high frequency conversion circuit. A comparison circuit for comparing the detection value output from the input power detection circuit with the detection value output from the output power detection circuit, and the lighting circuit section based on the comparison signal output from the comparison circuit. It is configured to include a control circuit that matches a high frequency power source and a lamp load and controls so as to reduce power loss in the high frequency conversion circuit.

In the electrodeless discharge lamp lighting device according to the present invention, the output power detection circuit for detecting the power output from the high frequency conversion circuit and the detection value output from the output power detection circuit are preset. A comparison circuit for comparing reference values and a matching circuit between the high frequency power supply and the lamp load are taken by the lighting circuit section based on the comparison signal output from the comparison circuit to reduce the power loss in the high frequency conversion circuit. A control circuit for controlling is provided.

Also, the electrodeless discharge lamp lighting device according to the present invention changes the degree of coupling between the lighting circuit section and the discharge lamp body based on the input dimming signal, thereby dimming the non-polar discharge lamp. It is configured to include a control circuit for performing.

[0010]

According to the structure according to the above-mentioned claim 1, the lighting power input into the lamp body is made constant by matching based on the deviation of the power output from the power supply circuit from the reference value. Therefore, the light output from the electrodeless discharge lamp can be made constant.

According to the structure corresponding to claim 2,
By performing matching based on the comparison value of the input / output power of the high frequency conversion circuit, it is possible to suppress the power loss in the high frequency conversion unit.

According to the structure corresponding to claim 3,
By comparing the detected value of the output power of the high frequency conversion circuit with the reference value and performing matching based on this comparison value, the power loss in the high frequency conversion unit can be suppressed to a small level.

According to the structure corresponding to claim 4,
The light output from the lamp can be changed by changing the degree of coupling with the lamp body based on the dimming signal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the electrodeless discharge lamp lighting device according to the present invention will be described below in detail with reference to the drawings. An example of this lighting device is shown in the block diagram of FIG. In this figure, the commercial AC power supply 1 is full-wave rectified by a rectifier circuit 3 composed of a diode bridge via a noise filter 2.
The DC power source output from the rectifier circuit 3 is input to the low distortion input power source circuit 4. The low-distortion input power supply circuit 4 includes an inductor 5, a field effect transistor (FET) 6 that is a switch element, a diode 7, and a capacitor 8 that form a chopper circuit. Between the output terminals of the low distortion input power supply circuit 4, a series circuit of FETs 10 and 11 which are switching elements forming the high frequency conversion circuit 9 is connected via a resistor 12. Diodes 13 and 14 for preventing reverse breakdown voltage are connected in parallel to these FETs 10 and 11, respectively. A driver circuit 16 to which an oscillation output is supplied from the driver control circuit 15 is connected to the gates of the FETs 10 and 11. In this high-frequency conversion circuit 9, a high-frequency power source of several MHz or more is produced, and this high-frequency power illuminates a non-polar discharge lamp 17 described later at a high frequency.

The FE which is the output terminal of the high frequency conversion circuit 9
The connection point of T10 and T11 is connected to a lighting coil 19 via a variable capacitor 18 (hereinafter referred to as a variable capacitor 18), and the other end of the lighting coil 19 is the other output end of the high frequency conversion circuit 9 (grounded). Side). A capacitor 20 is connected in parallel to the lighting coil 19. Here, the variable capacitor 18, the lighting coil 19 and the capacitor 20 constitute a lighting circuit section 21 which is a resonance circuit for lighting the electrodeless discharge lamp 17. The outer bulb of the lamp body 22 of the non-polar discharge lamp 17 is made of quartz glass and has a spherical shape. As shown in FIG.
A lighting coil 19 is wound several turns around the center of the outer circumference of 2. The adjustment of matching between the high frequency power source and the lamp load by the lighting circuit unit 21 is performed by changing the inductance or the electrostatic capacitance, which are the circuit constants of the circuit unit 21, or by adjusting the lighting coil 19.
This can be done by changing the positional relationship between the lamp body 22 and the lamp body 22.
The connection point between the lighting coil 19 and the variable capacitor 18 is connected to the starter circuit 24 via the capacitor 23. The starter circuit 24 has a configuration in which an inductor 25 for resonance, a capacitor 26, and a resistor 27 for damping are connected in parallel. In the figure, L1 and R1 are an inductance component and a resistance component that represent the lamp body 22 equivalently,
C1 is an electrostatic capacitance that appears between the external circuit and the lamp body 22.

The connection point between the switching FET 11 and the resistor 12 is connected to the non-inverting input terminal of the comparison circuit 29 via the resistor 28. A reference voltage source 30 (reference voltage is V1) is connected to the inverting input terminal of the comparison circuit 29. A capacitor 31 is connected between the non-inverting input terminal and the ground side of the power supply circuit 4. From the connection point of the FET 11 and the resistor 12, the current value output from the low distortion input power supply circuit 4 can be detected at the voltage level, and the output voltage of the low distortion input power supply circuit 4 is kept constant. By detecting the output current, the power output from the low distortion input power supply circuit 4 is indirectly detected. This allows
By comparing the detected value of the output current with the reference voltage V1 in the comparison circuit 29, a comparison signal proportional to the output power from the low distortion input power supply circuit 4 is obtained from the comparison circuit 29.
The output of the comparison circuit 29 is input to the matching control circuit 32 and the motor control circuit 33. The matching control circuit 32 controls the amount of rotation of the motor 34 that drives the variable capacitor 18. Further, the motor control circuit 33 controls the rotation amount of the motor 35 that moves the lamp body 22 in the axial direction of the coil 19 with respect to the lighting coil 19.

The mechanism for moving the lamp body 22 includes a case 36 and a support shaft 3 which are transparent to the lamp body 22.
A rack gear 38, which is supported by 7 and is attached to the tip of the support shaft 37, meshes with a pinion gear 39 rotated by a motor 35. As a result, the lamp body 22 is moved in the vertical direction with respect to the lighting coil 19 according to the rotation amount of the motor 35,
And the relative position of the lamp body 22 can be changed.

A dimming signal is inputted from the dimming control circuit 40 to the motor control circuit 33 and the matching control circuit 32.

Next, the operation of the electrodeless discharge lamp lighting device configured as described above will be described. First, when the power is turned on, the starter circuit 2 connected to the high frequency conversion circuit 9
4, high kick-like energy is generated due to resonance,
This energy is supplied into the lamp body 22. At this time, the lighting gas or vapor enclosed in the lamp body 22 is discharged, and energy is received from the lighting coil to form a plasma ring in the lamp body 22.
Is started. After the lamp is started, the lamp body 22 is connected via the plasma ring magnetically coupled to the lighting coil 19.
Lighting power is supplied to the lamp 17, and the lamp 17 is turned on. When the electric power output from the low distortion input DC power supply circuit 4 fluctuates due to the deviation of the matching between the high frequency power supply and the lamp load immediately after the start of the lamp and the deviation of the matching due to the change over time of the lamp body 22, Based on the output of the comparison circuit 29, a drive control signal for changing the degree of coupling between the lighting coil 19 and the lamp body 22 by changing the positional relationship between the lighting coil 19 and the lamp body 22 is first output from the motor control circuit 33.
5 is output. As a result, the motor 35 is rotated by a predetermined amount and the lamp main body 22 is moved in the vertical direction with respect to the lighting coil 19, so that a rough matching between the two is obtained. Next, the matching error at this time is detected again by the comparison circuit 29, and based on the output of this comparison circuit 29, the matching control circuit 32 outputs a drive control signal for rotating the variable condenser 18 to the motor 34. .. As a result, the variable capacitor 18 is rotated by a predetermined angle, the capacity of the variable capacitor 18 is changed, and the high frequency power supply and the lamp load are matched. By a series of these operations, the electric power input from the lighting coil 19 to the lamp main body 22 is made constant, the electrodeless discharge lamp 17 is satisfactorily started in the lighting state immediately after starting, and the light output during lighting is constantly maintained. Holds constant.

Next, the operation when the dimming control circuit 40 inputs a dimming signal to the motor control circuit 33 and the matching control circuit 32 to dimm the electrodeless discharge lamp 17 will be described. As described above, ring plasma is formed in the lamp body 22, and the lighting coil 19 wound around the outer circumference of the lamp body 22 is magnetically coupled to this ring plasma. Therefore, the degree of coupling between the lighting coil 19 and the lamp body 22 can be changed by changing the relative position between the lighting coil 19 and the lamp body 22, and the electric power sent into the lamp body 22 can be changed. Thus, the light of the lamp 17 can be adjusted. At this time, since the impedance of the load viewed from the high frequency conversion circuit 9 changes, it is necessary to change the capacitance of the variable capacitor 18 in the lighting circuit section 21 to adjust the matching state for circuit protection. First, when the dimming signal is input, a drive control signal is output from the motor control circuit 33 to the motor 35 in order to perform a predetermined dimming based on the dimming signal. As a result, the lamp main body 22 is moved up and down with respect to the lighting coil 19, the electric power input from the coil 19 to the lamp main body 22 is changed, and dimming of the lamp 17 is performed. Then, the comparison circuit 2
A drive control signal for adjusting matching based on the output from 9 is output from the matching control circuit 32 to the motor 34 that drives the variable capacitor 18. As a result, the variable capacitor 18 is rotated by a predetermined angle, and matching between the high frequency power supply and the lamp load is adjusted.

When detecting the output power of the power supply circuit 4, the switch element F in the power supply circuit 4 is used.
It is also possible to detect the average current or the peak current flowing through ET6 or the secondary winding of the inductor 5 for energy storage.

Next, an electrodeless lamp lighting device of another embodiment shown in FIG. 3 will be described. In this embodiment, the input / output power of the high frequency conversion circuit 9 is detected and compared, the lighting circuit section 21 is controlled so that the comparison error is minimized, and the high frequency power supply and the lamp load are matched. .. In this figure, the input terminal of the high frequency conversion circuit 9 is the input power detection circuit 4
1, and the detection circuit 41 detects the electric power input to the high frequency conversion circuit 9. The detection value output from the detection circuit 41 is input to the comparison circuit 42. The output terminal of the high frequency conversion circuit 9 is the output power detection circuit 43.
The detection circuit 43 detects the electric power output from the high frequency conversion circuit 9. This detection circuit 43
The detection output value from is input to the other input terminal of the comparison circuit 42. As a result, in the comparison circuit 42, the input / output power of the high frequency conversion circuit 9 is compared, and the comparison output is input to the matching control circuit 32 and the motor control circuit 33. The matching control circuit 32 and the motor control circuit 33 output a matching control signal to each of the motors 34 and 35 in the same procedure as the above-mentioned operation based on the input comparison signal. As a result, the matching state between the high frequency power supply and the lamp load is adjusted so that the power loss in the high frequency conversion circuit 9 is minimized. By this control, the circuit element of the high frequency converter 9 can be protected from being destroyed, and
The light output of the lamp 17 can be made constant regardless of changes over time. Even when the dimming signal is output, the dimming control of the electrodeless discharge lamp 17 is performed based on the above-described operation.

Next, an electrodeless lamp lighting device of another embodiment shown in FIG. 4 will be described. In this embodiment, the output power value of the high frequency conversion circuit 9 detected by the output power detection circuit 43 is input to the comparison circuit 42, and a reference from a reference voltage source 44 connected to the other input terminal of the comparison circuit 42. It is compared with the voltage V2. The output of the comparison circuit 42 is input to the motor control circuit 33 and the matching control circuit 32, and the matching state between the high frequency power supply and the lamp load is adjusted so that the power loss in the high frequency conversion circuit 9 is minimized.

Next, another matching adjusting means shown in FIG. 5 will be described. In this embodiment, the number of winding turns of the lighting coil 19 wound around the outer circumference of the lamp body 22 is switched by the switch 45 and the resonance capacitor 1 is used.
By switching 8A and 18B with the switch 46,
The inductance and the electrostatic capacitance, which are the circuit constants of the LC lighting circuit unit 21, are changed so that the high frequency power supply and the lamp load can be matched.

In the embodiment described above, the lamp body 22
The shape of the outer glass tube is spherical, but the shape of the outer tube is not limited to spherical. Further, instead of winding the lighting coil 19 around the outer periphery of the lamp body 22, the lamp body 22
It is also possible to perform matching or dimming control by providing a recess or hole in the axial direction of the above, arranging a lighting coil inside thereof, and inserting this lighting coil into or out of the lamp body 22. In addition, by inserting or removing a magnetic rod or a dielectric rod into or from a recess or hole formed in the axial direction of the lamp body 22, the degree of coupling between the lighting coil 19 and the lamp body 22 can be changed to perform matching or dimming. it can.

[0026]

As described above, according to the present invention, since it is possible to adjust the matching immediately after the lamp is started and in response to the change with time, the non-polar discharge lamp can be properly started up from the starting state to the lighting state. As well as
It is possible to stabilize the light output during lighting. Further, since the switching element of the high frequency conversion circuit can be protected from destruction, the reliability of the lighting device can be improved. Further, since the matching state can be optimized, power loss can be reduced. further,
According to the present invention, since the dimming of the non-polar discharge lamp is possible, the applications of the non-polar discharge lamp can be expanded.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a non-polar discharge lamp lighting device according to the present invention.

FIG. 2 is a perspective view for schematically explaining a mechanism for changing the position of the lamp body with respect to the lighting coil.

FIG. 3 is a circuit diagram showing a non-polar discharge lamp lighting device of another embodiment.

FIG. 4 is a circuit diagram showing a non-polar discharge lamp lighting device of still another embodiment.

FIG. 5 is a circuit diagram for explaining another means for matching.

[Explanation of symbols]

 1 Commercial AC Power Supply 3 Rectifier Circuit 5 Low Distortion Input Power Supply Circuit 9 High Frequency Converter 12 Resistance for Current Detection 15 Driver Control Circuit 16 Driver Circuit 17 Non-polar Discharge Lamp 18 Varicon 18A, 18B Capacitor 19 Lighting Coil 20 Capacitor 21 Lighting Circuit Section 22 Lamp body 24 Starter circuit 29, 42 Comparison circuit 30, 44 Reference voltage source 32 Matching control circuit 33 Motor control circuit 34, 35 Motor 37 Support shaft 40 Dimming control circuit 41 Input power detection circuit 43 Output power detection circuit 45, 46 Switch for change

Claims (4)

[Claims] 1. A lighting coil is arranged in the vicinity of a discharge lamp body, a DC power output from a power supply circuit is supplied to a high frequency conversion circuit to create a high frequency power supply, and the high frequency power supply is a reactor including the lighting coil. And a conductor are provided to a lighting circuit section, and a high-frequency power is input into the discharge lamp body magnetically coupled from the lighting coil of the lighting circuit section to light an electrodeless discharge lamp. In the device, a detection circuit that directly or indirectly detects the power output from the power supply circuit, a comparison circuit that compares a detection value output from this detection circuit with a preset reference value, and a comparison circuit from this comparison circuit Based on the output comparison signal, the lighting circuit matches the high-frequency power source with the lamp load, and the power input to the lamp body is always constant. An electrodeless discharge lamp lighting device, comprising: 2. A lighting coil is arranged in the vicinity of the discharge lamp main body, a DC power output from a power supply circuit is supplied to a high frequency conversion circuit to create a high frequency power supply, and the high frequency power supply includes the reactor including the lighting coil. And a conductor to provide a lighting circuit section having a resonance circuit, and high-frequency power is input into the discharge lamp body magnetically coupled from the lighting coil of the lighting circuit section to light an electrodeless discharge lamp. In the device, an input power detection circuit that detects power input to the high frequency conversion circuit, an output power detection circuit that detects power output from the high frequency conversion circuit, and a detection value output from the input power detection circuit. And a comparison circuit for comparing the detection value output from the output power detection circuit, and the lighting circuit based on the comparison signal output from the comparison circuit. By taking matching between the high-frequency power source and the lamp load, electrodeless discharge lamp lighting apparatus, characterized in that it comprises a control circuit which controls so as to reduce the power loss in the high frequency conversion circuit. 3. A lighting coil is arranged in the vicinity of the discharge lamp main body, a DC power output from a power supply circuit is supplied to a high frequency conversion circuit to produce a high frequency power supply, and the high frequency power supply is a reactor including the lighting coil. And a conductor to provide a lighting circuit section having a resonance circuit, and high-frequency power is input into the discharge lamp body magnetically coupled from the lighting coil of the lighting circuit section to light an electrodeless discharge lamp. In the device, an output power detection circuit that detects the power output from the high-frequency conversion circuit, a comparison circuit that compares the detection value output from the output power detection circuit with a preset reference value, and the comparison circuit Based on the output comparison signal, the lighting circuit section matches the high frequency power supply with the lamp load to reduce the power loss in the high frequency conversion circuit. An electrodeless discharge lamp lighting device, comprising: a control circuit for controlling so that the electrodeless discharge lamp is turned on. 4. A lighting coil is arranged in the vicinity of the discharge lamp main body, a DC power output from a power supply circuit is supplied to a high frequency conversion circuit to create a high frequency power supply, and the high frequency power supply includes the lighting coil. And a conductor are provided to a lighting circuit section, and a high-frequency power is input into the discharge lamp body magnetically coupled from the lighting coil of the lighting circuit section to light an electrodeless discharge lamp. The device comprises a control circuit for dimming a non-polar discharge lamp by changing the degree of coupling between the lighting circuit section and the inside of the discharge lamp body based on an input dimming signal. The electrodeless discharge lamp lighting device according to claim 1, claim 2, or claim 3.