WO1998038840A1

WO1998038840A1 - Discharge lamp lighting equipment and illuminating system

Info

Publication number: WO1998038840A1
Application number: PCT/JP1998/000840
Authority: WO
Inventors: Noriyuki Kitamura; Keiji Takahashi; Junji Hasegawa; Kouji Takahashi
Original assignee: Toshiba Lighting & Technology Corporation
Priority date: 1997-02-28
Filing date: 1998-02-27
Publication date: 1998-09-03
Also published as: KR20000064992A; EP0901315A4; EP0901315A1; KR100334657B1; KR20000030108A

Abstract

DC current of a source of DC (E) is inverted to high-frequency waves by means of an inverter circuit (11) to preheat filaments (FL1a, FL1b). Under this condition, a discharge detecting circuit (12) does not form a closed circuit for DC, and therefore a DC component is not applied to a capacitor (C3) and the capacitor (C3) is not charged. When a fluorescent lamp (FL1) discharges and then lights up, a DC component is applied to the capacitor (C3). When the voltage of the capacitor C3 becomes higher than that of the reference power supply (E1), it is judged that the fluorescent lamp (FL1) has discharged and lighted up. When the discharging is detected under the condition that preheating is necessary, the output of the inverter circuit (11) is lowered by negative feedback and the filaments (FL1a, FL1b) are preheated again while they are kept in a glow discharging state. When the filaments are sufficiently preheated, the voltage of the reference power supply (E1) is increased by a timer or other method to increase the output of the inverter circuit (11) and then start up the fluorescent lamp (FL1) to be lighted up.

Description

Description Discharge lamp lighting device and lighting device Technical field

SUMMARY OF THE INVENTION The present invention relates to a discharge lamp lighting device and a lighting device in which discharge lamps are appropriately preheated.

Background technology

Generally, a discharge lamp having a filament, which is a hot cathode in a valve, is not fired when it is started and turned on. Since thermal electrons are not easily emitted from the element and are liable to be damaged, the discharge lamp lighting device preheats the filament to make it easier to emit thermal electrons, and then discharges the arc. The discharge lamp is turned on in transition to discharge.

That is, a preheating capacitor is connected in parallel to the discharge lamp's filament, and the discharge lamp lighting device turns on the discharge lamp. Before starting, apply a voltage lower than the starting voltage of the discharge lamp to apply a preheating current to the filament to preheat it, and then use a timer or the like for a predetermined period of time. After a predetermined time has elapsed, the voltage applied to the discharge lamp is increased to start the discharge lamp, and the discharge lamp lighting device is preheated to 0, for example. A configuration is also known in which an impeller having a winding is connected to a transformer, and the filament is preheated by the preheating winding. In addition, when preheating the filament of the discharge lamp, instantaneous lighting due to the variation of the starting voltage, or insufficient preheating or preheating conditions, etc. If the value deviates from the appropriate value, the discharge lamp may be blackened at an early stage.

For this reason, it is necessary to set a sufficient margin for the starting voltage, and to add a control circuit that controls the preheating voltage to a constant value or a power supply fluctuation compensation circuit. There is a problem that the configuration becomes complicated because there is no such structure.

Also, depending on the discharge lamp, the filler is used to prevent blackening of the tube wall of the valve near the filament heated during preheating. It is also known that a white ring is attached around the periphery of the ment.

On the other hand, if the outer diameter of the valve has been reduced in recent years, discharge lamps with a small diameter of 21 mm or less are becoming widespread. With very small diameter knobs, there is almost no clearance around the filament and the ring cannot be mounted.

Also, even if the ring could be mounted around the filament, the heat would be applied to the pipe wall due to the preheating of the filament. Emitters are no longer available. When the resistance of the filament rises due to the elimination of the emitter, the distance between the valve wall of the valve and the filament becomes shorter. Therefore, the ring itself will be melted, causing a so-called ring sagging phenomenon. Therefore, the reduced discharge lamp without ring is also preheated as usual. After that, it is switched to arc discharge and turned on. However, when the filament is preheated and becomes reddish, there is no ring around the filament, so the reddishness is noticeable from the outside. I don't like it. In particular, in a discharge lamp in which the valve has a reduced diameter, the redness is conspicuous because the distance between the filament and the wall of the valve is short. Have a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and therefore, has a simple configuration in which a discharge lamp is appropriately pre-heated and a filament is sufficiently pre-heated. The purpose of the present invention is to provide a discharge lamp lighting device and a lighting device that make the redness of the filament inconspicuous.

Disclosure of the invention

A discharge lamp lighting device according to the present invention includes a discharge lamp lighting means for lighting a discharge lamp having a filament, and a discharge detection means for detecting discharge of the discharge lamp. And control means for lowering the output of the discharge lamp lighting means and preheating the filament when discharge is detected by the discharge detection means.

The discharge detecting means detects the discharge of the discharge lamp, and when the discharge of the discharge lamp is detected, the control means lowers the output of the discharge lamp lighting means. Discharge before the lamp is fully preheated to prevent it from starting and illuminating properly.

Also, the discharge detection means starts discharging at the time of starting. As a result, the discharge of the discharge lamp can be accurately detected with a simple configuration based on the detection of the DC voltage generated for the first time.

Furthermore, since the discharge lamp lighting means preheats the filament in a state where a slight discharge is generated in the discharge lamp, the discharge lamp is operated under a stable preheating condition. Preheat pump.

In addition, the discharge detecting means has a filter for removing the lighting frequency of the discharge lamp, so that the lighting frequency of the discharge lamp is removed in the evening. As a result, the influence of the pulsating flow of the lighting frequency is removed, and the discharge of the discharge lamp can be accurately detected with a simple configuration.

In addition, the discharge lamp lighting device of the present invention includes a switching element for switching, has a pair of filaments, and has a fluorescent material. And a variable output circuit that applies a voltage between the filament and the filament of a discharge lamp with a tube diameter of 21 mm or less. An inverter control circuit for controlling a switching operation of the switching element to vary an output of the inverter circuit; and a discharge lamp. It has a discharge detection means to detect the discharge of the discharge, and when the pre-heating time is set, the discharge breakdown voltage is applied between the filaments of the discharge lamp to perform a global discharge. In addition, after the elapse of the preheating time, an arc discharge is transferred between the filaments of the discharge lamp. A secondary voltage of a lamp to be applied is applied, and when a discharge is detected by the discharge detecting means, a discharge lamp is provided. And a start control circuit for operating the above-mentioned overnight control circuit so as to lower the voltage between the members.

During the set preheating time, the inverter circuit is controlled by the inverter control circuit, and the discharge breakdown voltage is applied between the filaments of the discharge lamp. As a result, the mode shifts to a very weak discharge, and a pre-heat occurs due to the flow of a large current that does not damage the filament due to the weak discharge. In the state of the global discharge, the lamp voltage becomes high and a large preheating current flows through the filament, and the filament with the global discharge The preheating operation causes the phosphor of the discharge lamp to emit light, and the redness of the filament becomes relatively inconspicuous, causing arc discharge after the preheating time. The secondary voltage of the changing lamp is applied between the filaments, and the lamp changes to an arc discharge and the point When this is detected by the discharge detecting means, the inverter control circuit lowers the voltage of the inverter circuit to turn on the discharge lamp, and the original discharge lamp is turned on. Prior to the arc discharge, the phosphor is pre-heated by emitting the phosphor with a small discharge that does not damage the filament, so that the filament is preheated. The redness of the filament will be less noticeable as it will not damage the filament.

In addition, the inverter circuit is connected to each of the filaments forming a pair of the discharge lamps, and a capacitor for the DC power is provided. DC component is cut by intervening And a DC output line that does not cut the DC component. The discharge detecting means detects a DC voltage of the DC cut line by a DC voltage detecting unit. The DC cut-off voltage is output according to the voltage value of the DC cut line detected by the DC voltage detector.Therefore, the DC cut line of the inverter circuit is By starting the discharge between the filaments, a DC voltage is generated and the DC voltage detector generates this DC voltage. Since the discharge between the two circuits can be detected, the output of the inverter circuit and the overnight control circuit can be controlled by the start control circuit and the inverter control circuit as soon as the discharge occurs. .

In addition, the circuit is connected to one of the filaments forming a pair of the discharge lamps, and is connected to a capacitor for the DC cut. A DC cut line in which the DC component is cut by the interposition of a sensor, and a DC output line in which the DC component is not cut, and the discharge detection means is a DC cut line. It has a first DC voltage detecting section for detecting the DC voltage of the tuner line, and a second DC voltage detecting section for detecting the DC voltage of the DC output line. The DC voltage is output according to the voltage difference between the DC voltage detector and the second DC voltage detector.Therefore, no DC voltage is generated on the DC output line before the discharge lamp discharges. Therefore, the first DC voltage detector and the second DC voltage detector provide a discharge lamp filter. The first DC voltage detector and the second DC voltage detector are detected by detecting the DC component of the voltage between the electrodes. Since the voltage difference between the voltage and the discharge between the filaments can be detected by reducing the voltage difference between the start-up control circuit and the overnight control circuit as soon as the discharge occurs. Thus, the output of the inverter circuit can be controlled.

In addition, the inverter circuit is connected to one of the filaments forming a pair of the discharge lamp, and is connected to a capacitor for the DC cut. A DC cut line in which a DC component is cut by an intervening sensor, and a DC output line in which the DC component is not cut. It has an AC voltage detector that detects the AC voltage of the G line, and outputs the detection amount of the AC voltage detector according to the voltage on the DC cut line to the secondary voltage control of the lamp. Depending on the presence or absence of a DC component between when the discharge lamp is lit by discharge and when it is not lit, the DC cutoff is performed by the AC voltage detector. By detecting the AC voltage of the wire, the discharge between the filaments can be detected, and the discharge occurs. ∎ You can control the output of by Ri fin bar one evening circuit to start control circuit your good beauty fin bar one evening control circuit to Luo immediately.

The DC voltage detection section of the discharge detection means has a DC voltage detection section for dimming and a DC voltage for dimming, with different detection levels. Since it is equipped with a detection unit, it can easily handle both full light and dimming by simply changing the detection level.

In addition, the DC voltage detector for all-light operation sets the detection level to be different between preheating and when all light is turned on. There is a changeover means, and it is related to the detection level for pre-heating> the detection level for dimming> the detection level for all-lights lighting. By making these detection levels different, it is possible to reliably detect preheating, dimming, and when all lights are on.

Further, the discharge detecting means has a current detecting section for detecting a lamp current, and when the lamp current is detected, a signal is sent from the current detecting section to the start control circuit. Before the discharge lamp is lit, the current detector detects the presence or absence of a lamp current.If the lamp current is detected, start the control circuit. By reducing the output of the inverter circuit by the inverter control circuit, it is possible to keep the maximum discharge while maintaining the global discharge state. Can be ripened.

In addition, the inverter circuit is connected to one of the filaments forming a pair of the discharge lamps, and a capacitor for the DC power is connected to each of the filaments. It has a DC cut line through which a DC component is cut and a DC output line through which a DC component is not cut, and is connected to the DC cut line. And a second DC voltage detector connected to the DC output line, and the first DC voltage detector and the second DC voltage detector are connected to the first DC voltage detector and the second DC voltage detector. It has an end-of-life detection circuit that outputs a detection amount corresponding to the voltage difference between the inverter and the inverter circuit based on the stop signal output by the end-of-life detection circuit. Switching operation of the switching element Since the device has an oscillation stop circuit that stops the operation, the discharge lamp generates a difference between the first DC voltage detection unit and the second DC voltage detection unit when the discharge lamp is operating normally. However, when the discharge lamp reaches the end of its life, electrons are no longer emitted from one of the filaments, and a half-wave discharge state occurs, resulting in a DC cut. There is a difference between the DC component detected by the G line and the DC component detected by the DC output line, and this difference is detected by the end-of-life detection circuit, and oscillation stops. The oscillation operation of the switching element of the inverter circuit is stopped by the circuit.

In addition, a plurality of inverter circuits are provided corresponding to a plurality of discharge lamps having the same lighting frequency and different lamp powers, so that a low-frequency AC power supply voltage can be supplied to a full-wave circuit. A power input circuit that has a full-wave rectifier circuit for rectification, and is connected to and connected to a plurality of inverter circuits provided for the different lamp power; The first capacitor has a capacity that does not indicate a smoothing operation with respect to the first capacitor. The first capacitor is connected to the power input circuit side more than the first capacitor. A second capacitor having a larger capacity than the capacitor, connected between the first and second capacitors. The high-frequency current based on the reactive power regenerated on the input side causes the switch on the cathode of the first capacitor to switch. A rectifying diode operating in a ringing manner, a series circuit of a smoothing capacitor and an inductor element connected in parallel to the first capacitor, and Data times A plurality of low-distortion circuits respectively connected to the front stage of the road are provided, so that the low-distortion circuit can be installed before the inverter circuit to improve the impedance. A high-frequency current based on the reactive power that is regenerated on the input side when the switching element in the circuit is turned off, is connected between the DC output terminals of the full-wave rectifier circuit. The high frequency ripple voltage is superimposed on the integrated capacitor, and the rectifier diode is passed over the entire section of the input current at the same frequency as the lighting frequency of the inverter circuit. The power factor is improved by operating the inverter, and if there is a difference between the lighting frequencies of the respective inverter circuits, the switching of the rectifier diode switches. It appears as a difference in frequency and generates vibrations, producing a growling sound. The lighting frequency of each inverter circuit is set to be the same to prevent a growling sound from being generated.

In addition, a plurality of inverter circuits are provided corresponding to a plurality of discharge lamps having the same lighting frequency and different lamp power, and a low-frequency AC power supply is provided. A power input circuit having a rectifier circuit for performing full-wave rectification of the voltage, the power input circuit being shared by and connected to a plurality of invertor circuits provided in correspondence with the different lamp powers; A first capacitor having a capacity that does not show a smoothing operation with respect to a low-frequency voltage.The first capacitor is connected to the power input circuit side more than the first capacitor. A second capacitor having a larger capacity than the first capacitor, and a second capacitor connected between the first capacitor and the second capacitor. Based on the reactive power that is connected and regenerated to the input side A rectifier diode that operates the first capacitor on the capacitor side by high-frequency current, and is connected in parallel to the first capacitor. A plurality of low-distortion circuits each including a series circuit of a smoothing capacitor and a inductor element, each of which is connected to a preceding stage of the above-mentioned one-night circuit; and A circuit board on which each of the inverter circuits is divided and mounted for each block, and each of the inverter circuits at a position straddling between the blocks. Since a switching element in the inverter circuit and a heat sink mounted on a circuit board are provided, a plurality of discharge lamps are provided for each of the pins. Lighting in the inverter circuit may cause interference between the inverter circuits, but each inverter circuit may cause interference. Since each block is mounted on a circuit board in a block, interference between inverter circuits can be prevented, and each inverter circuit can be switched. Heat sinks that dissipate heat from elements that generate heat, such as switching elements, are mounted on the circuit board so as to straddle each block. Therefore, interference between the wiring elements can be reduced, and wiring can be easily routed in each block.

Further, the lighting device includes a discharge lamp lighting device and a fixture main body in which the discharge lamp lighting device is provided.

In addition, the lighting device is a discharge lamp lighting device and the discharge lamp is a ring-shaped lamp that is energized by each inverter circuit and has a ring shape of 21 mm or less and different outside diameters. With a fluorescent lamp, The instrument body is a disk that holds these fluorescent lamps concentrically.

Brief description of the drawings

FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp lighting device according to the present invention, FIG. 2 is an exploded perspective view showing the same lighting device, and FIG. 3 is a diagram showing that the fluorescent lamp is not discharged. Fig. 4 is an equivalent circuit diagram showing a state in which the fluorescent lamp has discharged, and Fig. 5 shows a state in which the fluorescent lamp is not installed. FIG. 6 is a circuit diagram showing a discharge lamp lighting device of another embodiment, FIG. 7 is an exploded perspective view showing a lighting device of another embodiment, and FIG. FIG. 9 is a circuit diagram showing a lighting device, FIG. 9 is a plan view schematically showing an example of mounting on the circuit board, and FIG. 10 is a circuit diagram mainly showing one inverter device. is there .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a lighting device according to the present invention will be described with reference to the drawings.

FIG. 2 is an exploded perspective view showing the lighting device. As shown in FIG. 2, the thin disk-shaped device main body 1 has a bow I which is not shown by an adapter 2. The fluorescent lamps FL 1 and FL 2 as discharge lamps are mounted on the lower surface of the instrument body 1. The fluorescent body lamps FL 1 and FL 2 are attached to the transparent body 4 together with the holder body 3. It is more covered. The discharge lamp lighting device 5 is housed in the appliance body 1.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device. In addition, this discharge lamp lighting device 5 shows only the fluorescent lamp FL1. As shown in FIG. 1, in this discharge lamp lighting device 5, an inverter circuit 11 as a discharge lamp lighting means is connected to a DC power supply E, and this One end of the filaments FLla and FLlb of the fluorescent lamp FL1 is connected to the bar circuit circuit 11 via a capacitor C1 for DC cut and an inductor L1. The starting capacitor C2 is connected between the other ends of the filaments FLla and FLlb. Note that the inverter circuit 11 is configured so that, when the voltage of the fluorescent lamp FL1 increases due to a defect or the like, the output is increased up to the set voltage. It is.

Furthermore, the connection point between the inductor L1 on the side having the capacitor C1 for DC cut and the one end of the filament FL la of the fluorescent lamp FL1 is connected to the connection point. A discharge detection circuit 12 as a discharge detection means is connected, and the discharge detection circuit 12 removes an AC component of a lighting frequency of the fluorescent lamp FL1. It has a filter 14, a resistor and a series circuit of resistors, and a capacitor C3 connected in parallel with the resistor R2. The connection point between the resistor R1 and the resistor R2 is connected to one input terminal of the comparator 15 as control means, and the other end of the comparator 15 is connected to the other input terminal. The input terminal is connected to an output voltage variable reference power supply El, and the output terminal of this comparator 15 changes the oscillation frequency of the inverter circuit 11 according to the voltage. It is connected to the inverter overnight circuit 11 via VF016.

Note that a similar inverter circuit is separately provided for the fluorescent lamp FL2.

Next, the operation of the above embodiment will be described. First, the DC of the DC power supply E is converted into a high frequency by the inverter circuit 11, and the filaments FLla and FLlb of the fluorescent lamp FL1 are preheated. In this state, as shown in the equivalent circuit of FIG. 3, the starting capacitor C2 is connected via the resistors Rla and Rib of the filaments FLla and FLlb. Although connected, a direct current is not applied to the capacitor C3 because a closed circuit is not formed in a DC manner by the capacitor C1 and the capacitor C2. Not charged, capacitor C 3 is not charged 0

When the fluorescent lamp FL1 discharges and lights up, the resistor RFL is connected as shown in the equivalent circuit of FIG. 4, so that the resistor RFL and the resistor R1 are connected. When a DC component is applied to the capacitor C3 and the voltage of the capacitor C3 becomes higher than the reference voltage E1, a fluorescent lamp is formed. It can be determined that the lamp FL1 has discharged and turned on. When the filaments FLla and FLlb of the fluorescent lamp FL1 are preheated, the voltage of the reference power supply E1 should be kept low. When the discharge of the fluorescent lamp FL1 is detected in a state where the filaments FL la and FLlb need to be preheated, the output of the inverter circuit 11 is caused by negative feedback. While reducing the power and maintaining a micro-discharge state such as a non-discharged state or a glow discharge, the filament preheating current via the capacitor C2 is reduced. Flow and preheat filaments FLla and FLlb again. Thereafter, when the filaments FLla and FLlb are sufficiently preheated, the voltage of the reference power supply E1 is increased by a timer or the like, and the output of the inverter circuit 11 is increased. Then, the fluorescent lamp FL1 is started and turned on, and after the lighting, the detection state such as the end of the life of the fluorescent lamp FL1 is detected based on the increased reference voltage E1. As described above, by preheating the filaments FLla and FLlb sufficiently while maintaining the global discharge, the variation of the preheating voltage is considered. This eliminates the need for a power supply fluctuation compensation circuit or a circuit for detecting fluctuations, which simplifies the circuit configuration and reduces the need for preheating conditions. It is possible to eliminate flickering, thereby reducing the size of the filaments FLla and FLlb, and extending the life of the fluorescent lamp FL1. In addition, since the filaments FLla and FLlb are preheated in the state of the global discharge, etc., the brightening is obtained by the global discharge, so that the preheating is performed. Even if the time is a little longer, you will not feel the discomfort of starting slowly.

In addition, when the filament is preheated, the filament becomes reddish due to red heating, but it is discharged by the global discharge. The redness is alleviated by the radiation, and discomfort can be reduced.

On the other hand, when the fluorescent lamp FL1 is not mounted, as shown in the equivalent circuit of FIG. 5, the discharge detection circuit 12 includes the capacitors C1 and C1. Since a closed circuit is not formed in a DC manner by the capacitor C2, no DC component is applied to the capacitor C3, and the capacitor C3 is not charged. If this state continues for a predetermined time or longer, it is determined that the fluorescent lamp FL1 is not connected, and the output of the inverter circuit 11 is stopped.

To detect the end of life of the fluorescent lamp FL1, for example, a half-wave from the filament FLla of the fluorescent lamp FL1 to the filament FLlb is used. In the case of discharging, the charge is similarly accumulated in the capacitor C3, and when the voltage of the capacitor C3 becomes higher than the voltage of the reference power supply E1, the fluorescent lamp is discharged. As the end of the life of the pump FL1, the output of the inverter circuit 11 decreases or stops.

On the other hand, when a half-wave discharge is performed from the filament FLlb of the fluorescent lamp FL1 to the filament FLla, the voltage of the capacitor C3 is reversed. Since the voltage of the capacitor C3 does not become higher than the voltage of the reference power supply E1, the voltage of the capacitor C3 increases. Although the output of the inverter circuit 11 does not decrease on the basis of the output of the light source 15, the voltage of the fluorescent lamp FL1 rises, so that the fluorescent lamp FL1 increases. As the end of its life, the output is reduced or reduced by the inverter circuit 11. Stop .

Another embodiment will be described with reference to FIG. 6. FIG. 6 is a circuit diagram showing a discharge lamp lighting device according to another embodiment, and the embodiment shown in FIG. In the embodiment shown in FIG. 1, one inverter circuit

In Fig. 11, two fluorescent lamps FL1 and FL2 are connected, and a discharge detection circuit 12 is connected to each of the fluorescent lamps FL1 and FL2.

As for the method of controlling the inverter circuit 11, preheating may be controlled simultaneously for the two fluorescent lamps FL1 and FL2. When the end of life of the fluorescent lamps FL1 and FL2 occurs, control is performed to stop the output of only the corresponding fluorescent lamps FL1 and FL2. Good. For preheating, the time may be set differently for each of the fluorescent lamps FL1 and FL2.

In any of the embodiments, as a method of detecting the discharge, the preheating current of the filament is changed by using a transformer or the like. However, it may be detected at the part where the filament preheating current does not flow, or may be detected. In this case, since the detected value is the amount of discharge, it is effective to detect by peak detection or the like.

In addition, the method of reducing the output of the inverter circuit 11 is not limited to the method of changing the frequency, but may be the method of reducing the duty. The output may be controlled by converting the ratio.

In any of the discharge lamp lighting devices 5 described above, when the discharge of the fluorescent lamps FL1 and FL2 is detected by the discharge detection circuit 12 and the discharge of the fluorescent lamps FL1 and FL2 is detected, Since the output of the inverter circuit 11 is reduced by the comparator 15, the fluorescent lamps FL1 and FL2 are discharged before they are sufficiently preheated, thereby preventing the fluorescent lamps from being turned on. Thus, preheating can be appropriately performed, and the life of the fluorescent lamps FL1 and FL2 can be prolonged.

Also, since the discharge detection circuit 12 is not connected to the inverter circuit 11 in a DC manner, the DC component of the current flowing in the discharge detection circuit 12 is cut off. This makes it possible to accurately detect the discharge of the fluorescent lamps FL1 and FL2 with a simple configuration.

In addition, the circuit 11 in the inn overnight preheats the filaments FLla FLlb, FL2a FL2b with a force that keeps the fluorescent lamps FL1 and FL2 in a slightly discharged state. In addition to being able to obtain brightness, the fluorescent lamps FL1 and FL2 can be preheated under stable preheating conditions.

Furthermore, since the discharge detection circuit 12 has a pass filter 14 for removing the lighting frequency of the fluorescent lamps FL1 and FL2, the discharge filter circuit 14 uses the ° filter 14. By eliminating the lighting frequency of the fluorescent lamps FL1 and FL2, the influence of the pulsating flow of the lighting frequency is removed and the discharge of the fluorescent lamps FL1 and FL2 is accurately detected with a simple configuration. it can .

Next, another embodiment will be described with reference to the drawings. Clarify.

FIG. 7 is an exploded perspective view showing a lighting device. The lighting device shown in FIG. 7 has a tube diameter as a hot cathode type discharge lamp in the lighting device shown in FIG. 21 Tube type less than 11 mm with different outer diameter and output.Three rings, for example, 20 W fluorescent lamp FL1, 27 W fluorescent lamp FL2 and 34 W fluorescent lamp FL3 are held concentrically. The fluorescent lamps FL1, FL2, and FL3 are held in a holder (not shown) because they require careful handling with a thin tube type. In addition, a circular opening 22 is formed at the center of the instrument body 1, and a reflective cover 23 is mounted at a position corresponding to the opening 22. In addition, even if the pipe diameter is 2 lmm or less, if the pipe diameter is smaller than 15 mm, the strength is weak and it is not practical to use extra care when handling it. Rather, it is preferred that the tube has a diameter of 15 mm or more. In addition, none of the fluorescent lamps FL1, FL2, FL3 has a ring for preventing blackening.

Fig. 8 is a circuit diagram showing a discharge lamp lighting device.The discharge lamp lighting device 31 shown in Fig. 8 has a commercial AC voltage of 100 V and a frequency of 50 Hz or 60 Hz. A full-wave rectifier circuit 32 for full-wave rectification is connected to the power supply e to form a power supply input circuit 33. In addition, a filter circuit may be connected to the commercial AC power supply e side which is the input side of the full-wave rectifier circuit 32. Its to, the power input circuitry 33 of this, fluorescent run-up for the FL1 Lee down bar evening equipment 3 ^, data device 34 ₂ Contact Lee down bar for fluorescent run-flop FL 2 good beauty fluorescent run-up FL3 Lee emissions Roh <one evening device 34 ₃ for being connected in parallel to the doctor each other, this is et al fin bar one evening device 3 ^, 34 _2, 34 ₃ by the power supply input circuit 33 Is shared.

Also, this is et al. Lee N'no, one data device 3, 34 _9, 34, low distortion circuit of the eye that you reduce the harmonic, 35 _2, 35 ₃ your good beauty was example, if the reactive power of one stone formula regeneration type fin Roh one capacitor circuit, 36 _2, 36 ₃ that is configured as a composite having a, you output frequency of their respective 4 5 k H z.

And these low distortion circuits, 35., 35. Have a choke coil L11 which is an inductor element and a rectifying diode between output terminals of the full-wave rectifier circuit 32, each having almost the same circuit configuration. The series circuit of the capacitor D11 and the first capacitor C11 is connected, and the input side of the first capacitor C11 is connected to the choke coil. A second capacitor C12 is connected via L11, and a choke coil as an inductor element is connected in parallel with the first capacitor C11. L12 and capacitor C13 for smoothing are connected. Further, the first capacitor C11 has such a small capacity that it does not substantially exhibit a smoothing action at the low frequency which is the frequency of the commercial AC power supply e, so that the second capacitor C11 is used. Since the capacitor C12 functions to improve the power factor, the capacity of the second capacitor C12 is equal to the capacity of the first capacitor C12. It is set to be sufficiently larger than the capacity of capacitor Cll. 0

Also, Lee down bar capacitor circuit 36 E, also 36 _2, 36 _3, in the respective almost the same configuration Re their, to force-les-down voyeur run-scan feedback if example door illustrated a stomach In addition to having a transistor Q11 as a switching element and a switching element, a discharge detection circuit as a discharge detection means is provided. Turn on the fluorescent lamps FL1, FL2, and FL3 at the same frequency O

Et al. Is, this is, et al. Lee down bar evening circuit 36, 36 _9, 36 _3, co-down data of the DC mosquitoes Tsu door DC mosquitoes Tsu door to such not direct current output line 38 you good beauty shown not a Via the DC cut line 39 via the sensor, respectively, to the filaments FLla, FLlb, FL2a, FL2b, FL3a, FL3b of the fluorescent lamps FL1, FL2, FL3, respectively. It is connected .

Next, the mounting of the discharge lamp lighting device 31 will be described with reference to FIG.

Fig. 9 is a plan view showing the circuit board on which the discharge lamp lighting device is mounted. As shown in Fig. 9, the fixture body 1 and the fixture body 1 are mounted on the top side of the fixture body 1. A circuit board 41 formed substantially in a U-shape corresponding to the opening 21 is attached. Also, on the circuit board 41, power input circuit 33, Lee down bar motor unit 3 ^, 34 _2, 34 circuit components that form ₃ respectively grooves, their respective flop lock Bl, B2, Blocks B3 and B4 are implemented in this order. In addition, at the boundary between the blocks Bl, B2, B3, and B4 of the circuit board 41, on the opening 21 side of the appliance body 1, and as a protruding radiator plate on the opening 21 side. The heat sinks 42 and 43 made of mini ground are attached to the device body 1 while being grounded, and these heat sinks 42 and 43 are connected to the power input circuit. 33 heat-generating element 44 your good beauty I of Nba one data device 3 ^. 34 _2, 34. The transistor Q1 of each is mounted. When the heat generating element 44 and the transistor Q1 generate heat, the heat is dissipated by the heat sinks 42 and 43. In addition, since the temperature in the vicinity of the opening 21 is considered to be the lowest in the appliance body 1, the heat sinks 42 and 43 can efficiently dissipate heat, and the heat generating elements 44 and 43 can be used. In addition, the temperature rise of the transistor Q1 can be suppressed, and the mutual interference due to heat between the heating element 44 and each of the transistors Q1 can be suppressed.

Et al of each Lee down bar motor apparatus 34 i. 34 _2, 34 ₃ is in situations have easy and interference operate in independent, blanking lock is on the circuit board 41 Bl, B2 , B3, and B4 are implemented as blocks, so that the effects of interference can be minimized. The mounting position of the heating element 44 and the transistor Q11 is located in each of the blocks Bl, B2, B3, and B4. Although it is located at a different position, it is easy to route the wiring.

Next, the operation of the above embodiment will be described. First, the AC voltage of the commercial AC power source e is converted to a full-wave rectifier circuit. When full-wave rectification is performed at 32, each of the low distortion circuits 35. , By reducing the harmonic Ru is low-distortion at 35 _3.

That is, the respective inverter circuits 36e and 36, respectively. , Ri by the high-frequency current that occur et al or 36 _n, to generate that by the series resonance frequency re pull-voltage between Ji ® chromatography click copolymers I Honoré L12 to the first co-down Devon Sa C11 The diode D11 is switched at a high frequency to improve the power factor, and the capacitor C3 smoothes the input current over the entire section.

If the voltage across the first capacitor C11 is V C11, and the voltage across the second capacitor C 12 is V C12, the rectifying diode D 11 is equal to the voltage VC 11 The switching operation is performed by the high frequency ripple voltage. On the other hand, the voltage V C12 of the second capacitor C12 is such that the capacity of the first capacitor C11 is C C11 and the capacity of the second capacitor C12 is C C12. Since the capacitance relationship is C C11 << C C12, there is no particular problem even if it is considered that the voltage V C12 = the voltage of the power supply input circuit 33, so that the voltage V C12 = the voltage of the power supply input circuit 33 And

For example, in a section where the voltage V C12 is equal to the voltage V C11, that is, in a section where the diode D11 is on, the inverter from the full-wave rectifier circuit 32 is turned on. capacitor circuit 36 i, 36 _2, 36 ₃ or current from Ru flows into the die even Tsu valleys der Ru Yu i have had low input voltage in the full-wave rectified waveform O over de D11 Gao If this happens, current will flow, and the power factor will be improved. On the other hand, in the interval between the voltages V C12 and V C11, that is, in the interval where the diode D11 is off, the full-wave rectifier circuit 32 to the inverter circuit 36e, 36 _2, 36 ₃ than have current Na flows in, on-time dialog O over de D 11 in the full-wave rectified Yu Ru ridges I have had a high input voltage in waveform Re Do rather short In this case, the peak current to capacitor C13 is suppressed. That is, if the section between the voltage V C12 and the voltage V C11 becomes longer, the distortion of the input current can be suppressed.

Then, the capacitance of the first capacitor C11 is reduced to cause series resonance with the choke coil L12 to cause a high-frequency reverberation, and the voltage V C11 By repeatedly stepping up and down the voltage, a section between the voltage V C12 and the voltage V C11 and a section between the voltage V C12 and the voltage V C11 are formed. Lee down bar capacitor circuit 36 E, 36 _2, 36 ₃ or et al. reactive power is boosted Ri by the and the child that will be regenerated, Lee Nba - evening circuit 36 i, 36ο, this that return power to the 36 ₃ It is stepped down. That is, when viewed from a high-frequency perspective, the impedance of the lead coil L12 is sufficiently larger than that of the first capacitor C11. , reactive power Lee down bar capacitor circuits 36 _1, 36 _2, 36 ₃ or colleagues than Ru is regenerated in pairs to the first co-down Devon Sa C11, the voltage V C11 is Ru is boosted. At the same time, there is also a charge of the first capacitor C11 from the capacitor C13 via the choke coil L12, and the voltage VC11 is boosted. On the other hand, an inverter circuit in which a current caused by the charge of the voltage V C11 is a load. 36],, 36. , 36. If the voltage V C11 falls to the voltage V C12, the diode D 11 turns on and the voltage from the full-wave rectifier circuit 23 is inverted. capacitor circuit 36〗, 36 _2, 36. The current flows through.

As described above, the longer the section of the voltage V C12 <the voltage V C11 at the place where the peak value of the input voltage of the power supply input circuit 33 is high, that is, the on-duration of the diode Dl 1 The lower the capacitance is, the more the charging current flowing into the capacitor C13 is suppressed. Therefore, the boosting of the first capacitor C11 for this purpose is performed by the choke coil. and charging to it L12 your good beauty co-down Devon Sa C13 or we first co-down Devon support C11, Lee emissions Roh, one evening circuits, 36 _2, 36 ₃ or we first co-down Devon It is important that the off-section of diode D11 can be made longer because of the regeneration of the reactive power of capacitor C11.

Also, Lee down bar evening circuit 36 i, 36 _2, 36 _3, the door run-di scan evening Q11 on, the Ri by the and child Ru changing the off frequency, fluorescent run-up FL1 , FL2, and FL3 change the lighting frequency, and turn on and off the frequency of the transistor Q11, thereby applying the fluorescent lamps to the fluorescent lamps FL1, FL2, and FL3. The voltage decreases, and conversely, by decreasing the frequency, the voltage applied to the fluorescent lamps FL1, FL2, FL3 increases.

Et al is, by sharing the power input circuit 33, the low-distortion circuits 35 _1, 35 ο, 35 ₃ is set only et been prior stage of each Lee down bar capacitor circuit 36 i, 36 _2, 36 ₃ Composite inverter device ₃₄ χ, 34 _2, 34 ₃ each fluorescent run-up using a parallel state FL1, FL2, FL3 that have to light the.

Also, Lee down bar data device 34 E, 34 _2, 34. Each frequency difference is 0, Ni Let 's that snares Do rather than the lighting frequency of Chi all hand and the like cause, each stomach 2 crowded bar evening circuit 36 E, 36 _2, 36 of ₃ of the circuit constant set of It is.

Each Yi in to the jar good of this Roh - evening Ri by the circuit 36, 36 _2, 36 ₃ and the child shall be the same frequency, and the this that occur the UNA Ri sound due to the frequency difference It does not cause discomfort to the user. On the other hand, for example, the lighting frequencies of the inverter circuits 36 and 3636 are different.

1 2 frequency

Three

If they are numbers, these frequency differences appear as the frequency differences of the respective diodes D11 that perform the switching operation at the lighting frequency. Then, in any one of the diodes D11, a large amount of the input current flows to the corresponding one of the input / output circuits 36, and the other one of the other inputs.

, ³⁶ 2, ³⁶ 3

In the diode of D11, one of the inverter circuits corresponding to the input current is 360 Do.

If the current does not flow too much in 1, 2, 3, etc., a difference may occur in the input current. Yo I Do not state the difference of this, one or is, all of the low-distortion circuit the influence of the frequency difference, 35 35 ₃ in order and the vibration was through a common power input circuit 33, UNA Ri sound against the outside Emit 0

In the preheating stage before the fluorescent lamps FL1, FL2, and FL3 shift to the lighting state due to arc discharge, the field lamp is turned off. By applying a discharge breakdown voltage that does not give an image to the flames FLla, FL2a, FL3a, FLlb, FL2b, FL3b continuously, the micro-discharge is a slight discharge state. As a result, the preheating current by the global current is passed through the filaments FLla, FLlb, FL2a, FL2b, FL3a, FL3b, and the filaments FLla, FLlb, FL2a , FL2b, FL3a, and FL3b emit gray light and shift to arc discharge.

Here, the fluorescent lamps FL1, FL2, and FL3 are in a state that the voltage applied to the filaments FLla, FLlb, FL2a, FL2b, FL3a, FL3bf is a predetermined voltage. The discharge state is maintained, but if the voltage is too high, the state shifts to arc discharge and shifts to the lighting state. Also, when the filament FLla, FLlb, FL2a, FL2b, FL3a, FL3b power is transferred to the arc discharge before it is sufficiently heated, the filament FLla, FLlb , FL2a, FL2b, FL3a, FL3b is damaged, and conversely, the current flowing through the filament FLla, FLlb, FL2a, FL2b, FL3a, FL3b through the filament discharge is small. If it is too small, the amount of light emitted from the phosphor is so small that the effect of canceling the redness of the filaments FLla, FLlb, FL2a, FL2b, FL3a, FL3b cannot be obtained. Therefore, it is important to maintain the micro-discharge properly at the current level of the global discharge before shifting to the arc discharge, and the global discharge at the start of preheating is important. The applied voltage value to be maintained, that is, the discharge breakdown voltage value and its time, that is, the preheating time, are set in advance in a sequence. Therefore, the fluorescent lamps FL1, FL2, and FL3 do not have a ring around the filaments FLla, FLlb, FL2a, FL2b, FL3a, and FL3b. However, even if the type of the target is the target, the filament FLla, FLlb, FL2a, FL2b, FL3a, FL3b is used for the preheating operation of the filament FLla, FLlb, FL2a, FL2b, FL3a, FL. Even if it is heated by calorific heat, the reddish color becomes less visible from the outside.

Next, another embodiment will be described with reference to FIG.

Fig. 10 is a circuit diagram mainly showing one inverter device, and Fig. 10 shows three inverter devices.

1,

34 _2, one of Lee down of the 34 ₃ Roh ^1? Shows only one evening device, omitted Lee down bar evening device 34 _2, 34 _3, that corresponds to the portion shown in FIG. 8 Parts are given the same reference numerals as in FIG.

The filter circuit 52 is connected to the commercial AC power supply e via the terminal blocks 50 and 51 and the fuse F. This filter circuit 52 has a constant voltage element Zl, a capacitor C21, and a transistor Tr11.The filter circuit 52 has a full-wave rectifier. The input terminal of the circuit 32 is connected, and this full-wave rectifying circuit 32 is composed of four diodes D 21, 22, D 23, and D 24, which are configured in a bridge. A constant voltage element Z2 and a capacitor C22 are connected between the output terminals of the wave rectifier circuit 32. These commercial AC power supply e, filter circuit 52 and full-wave rectifier circuit 32 How constitutes the power supply input circuit 33.

In addition, an inverter device 34 _接 is connected to the power input circuit 33, and this inverter device 3 ^ is a low-distortion circuit 35 of a fully smoothing system for harmonic countermeasures. It is a composite type having a single-pole reactive power regeneration type inverter circuit 36

The low distortion circuit is connected between the output terminals of the full-wave rectifier circuit 32 by a choke coil 11, which is an injector element, and a rectifying diode D11. And the series circuit of the first capacitor C11 is connected and the first capacitor C11 is connected.

A second capacitor C12 is connected to the input side of the capacitor C11 through a choke coil L11, and the first capacitor C11 is connected to the second capacitor C11. And a choke capacitor L12 as an inductor element in parallel with a smoothing capacitor

C13 is connected. Further, the first capacitor C11 has such a small capacity that it does not substantially exhibit a smoothing action at the low frequency which is the frequency of the commercial AC power supply e, so that the second capacitor C11 is used. Since the capacitor C12 functions to improve the power factor, the capacity of the second capacitor C12 is sufficiently larger than the capacity of the first capacitor C11. Set

Further, the inverter circuit 36 丄 is connected to the first capacitor.

A series resonance circuit 53 composed of a series circuit of an inductor L21 for resonance and a capacitor C25 for resonance is provided in parallel with C11, and a capacitor C25 is provided. In parallel with A transistor Qll as a switching element and a reflux diode D25 are connected. Furthermore, there is no connection between the connection point of inductor L21 and transistor Q11 and the connection point of choke coil L12 and capacitor C13. , A series circuit of a diode D26 and a capacitor C26 is connected, and a series circuit of a resistor R21, a resistor R22 and a resistor R23 is connected in parallel with the capacitor C26. Is connected.

Further, a series circuit of a resistor R24, a capacitor C27 and a resistor R25 is connected in parallel with the capacitor C12, and the resistor R24 and the capacitor C12 are connected in parallel. The connection point of the capacitor C27 is connected to the base of the transistor Q11 via the trigger element Q21.

One end of the inductor L21 is connected via the DC output line 38 to the connection point of the resistor R24 and the trigger element Q21 to the diode D27 of the DC cut line 39. , The input winding CTlla of the current transformer CT11, the capacitor C28 for DC cut and the terminal 54 via the <Last shock L25>. One end of each of the filament FL la and the filament FL lb of the fluorescent lamp FL1 is connected to this terminal 54, and these filaments are connected to these terminals. The other end of the filament FLla and the filament FLlb is connected to a starting capacitor C29 via a terminal 54.

In addition, a series circuit of a diode D31 and a resistor R26 is connected between the base and the emitter of the transistor Q11. At the same time, the series circuit of the output winding CTllb of the current transformer CT11, the capacitor C32, and the field effect transistor Q22 is connected. Yes. Further, a series circuit of a capacitor C33 and a capacitor C34 is connected between the collector and the emitter of the transistor Q11. The connection point of these capacitors C33 and C34 is connected to the base of the transistor Q23 and the base of the transistor Q23. The diode D35 is connected between the emitters and the collector is connected to the transistor Q11 via the diode D36. It has been. The drain and source of the field-effect transistor Q24 are connected to the collector and the emitter of the transistor Q23, and the capacitor and the emitter are connected to the collector and the emitter of the transistor Q23, respectively. A resistor B27 and a series circuit of zener diode ZD11 are connected in parallel with the capacitor C13, and the gate of the field effect transistor Q24 is connected to the resistor B27 and the resistor B27. It is connected to the connection point of ZD11.

A series circuit of a capacitor C36 and a diode D36 is connected to the DC cut line 39 via a resistor R31 and a resistor R32. A series circuit of a diode D37 and a capacitor C37 is connected to the diode D36, and constitutes an AC voltage detecting section 55.

Further, a series circuit of a resistor R34 and a resistor R35 is connected, and a capacitor C38 is connected in parallel with the resistor R35 to form a first DC voltage detecting section 56. ing. Also, a series circuit of a resistor R36, a resistor B37, a variable resistor R38 and a resistor R39 is connected, and these resistors are connected in parallel with the resistor R36, the resistor R37, the variable resistor K38 and the resistor K39. The capacitor C 39 is connected, and constitutes a DC voltage detector 57 for dimming.

In addition, a resistor D41, a resistor R42, a resistor R43, a resistor R44, and a switch as a switching means for switching a level between dimming and all-light. The series circuit of the ZD12 is connected to form a DC voltage detector 58 for all-light use.

In addition, the DC output line 38 of the fluorescent lamp FL1 via the filament FLla is connected to the resistor R48 via a series circuit of the resistor R45, the resistor R46 and the resistor R47. A series circuit of a resistor R49 is connected to the resistor B49, and a capacitor C40 is connected in parallel to the resistor B49 to form a second DC voltage detecting section 59.

In addition, it has a terminal 61, which is connected to a commercial AC power supply e via a fuse F via a jumper wire 62 and a nightlight 63. .

It also has a mode switching terminal 64, which is a dimming terminal (DIM), an on / off terminal (ON / OFF), and a ground terminal ( GND), and the dimming terminal is connected to the jumper wire 62 via the resistor R41, and there is no connection between the ON / OFF terminal and the ground terminal. The capacitor C42 is connected and the dimming terminal A capacitor C42 and a capacitor C43 are connected in parallel between the capacitor and the ground terminal, and a resistor R52 is connected in parallel with the capacitor C43. A series circuit of a resistor R53 is connected to the connection point of the resistor R52 and the resistor R53, and a base of a transistor Q26 is connected to the connection point of the resistor R53. The emitter of star Q26 is connected to the ground terminal of terminal 64, and the collector is connected to the base of transistor Q27. The base of the star Q27 is connected to the connection point of the resistor R54 and the resistor R55, and the resistor R54 is connected to the dimming terminal of the terminal 64 via the resistor B56 and the diode D41. It has been done.

In addition, between the on / off terminal and the land terminal of the terminal 64 via the diode D41, there is a programmable junction. The series circuit of the short-circuit transistor Q28 and the resistor B57 is connected, and the programmable transistor Q28 of the short-circuit transistor Q28 is connected. A parallel circuit consisting of a capacitor C44 and a resistor R58 is connected between the cathode and the gate, and the programmable junction is connected. 'The gate of transistor Q28 is connected to the collector of transistor Q29 via a resistor R59, and the transistor Q29's emitter is connected to the collector of transistor Q29. The transistor is connected to the ground terminal of terminal 64, and between the base and the emitter of the transistor Q29, the capacitor C45 and the capacitor C45 are connected. The parallel circuit of the resistor R61 is connected, and the base of the transistor Q29 is connected directly to the resistor R62 and the Zener diode ZD13. A column circuit is connected, and a capacitor C46 is connected in parallel with the series circuit of the Zener diode ZD13, the resistor R62 and the resistor R61. . The connection point of the zener diode ZD13 and the capacitor C46 is connected to the connection point of the resistor R34 and the resistor B35 via the diode D42. The connection point of the diode ZD13 and the diode D42 is connected to the collector of the transistor Q31, and the base of the transistor Q31 is connected to the collector of the transistor Q31. It is connected to the connection point of the resistor R34 and the resistor R35 via the diode D43, and forms the end-of-life detection circuit 65.

A capacitor C47 is connected between a connection point of the diode D41 and the resistor K56 and a ground terminal of the terminal 64. Further, the connection point of the diode D41 and the resistor R56 is connected to the gate of the field-effect transistor Q22 via the resistor R65, and the connection point of the capacitor is established. It is connected to the negative electrode of the full-wave rectifier circuit 32 via the sensor C48. The connection point of the diode D41 and the resistor 56 is connected to the base of the transistor Q31 via the resistor R66, and the transistor is connected to the base of the transistor Q31. The parallel circuit of resistor B67 and capacitor C51 is connected to the base and emitter of Q31.

In addition, in parallel with capacitor C47 via resistor R56, a series of zener diode ZD15 and zener diode ZD16 as a reference voltage source is connected. The circuit and the capacitor C52 are connected in parallel, and a resistor R56 and a capacitor The resistor R71 is connected between the diode ZD13. In addition, a series circuit of a resistor R72 and a resistor R73 is connected in parallel with the capacitor C47, and the resistor! ? A capacitor C53 is connected in parallel with 73, and a series circuit of a resistor B74 and a capacitor C54 is connected in parallel with capacitor C52. The base of the transistor Q32 is connected to the connection point of the resistor R72 and the resistor R73, and the collector of the transistor Q32 is connected to the resistor R74 and the resistor R73. The emitter is connected to the connection point of the capacitor C54, and the emitter is connected to the ground terminal of the terminal 64.

Furthermore, a series circuit of capacitor C55 and capacitor C56 is connected in parallel with capacitor C52, and is connected in parallel with capacitor C55. Is connected to a diode D41, and a resistor R76 is connected in parallel with the capacitor C56. The base of the transistor Q33 is connected to the connection point of the capacitor C55 and the capacitor C56, and the transistor Q33 is connected to the base of the transistor Q33. The emitter is connected to the resistor R56 via the resistor R77 and to the connection point of the resistors B47 and B48, and the collector is connected to the resistor R78 and the resistor R78. It is connected to the terminal 64 of the terminal 64 via the diode D42.

Also, the base of transistor Q33 is connected to diode D37 and diode D37 via diode DZ17 and diode D37. Connected to the connection point of C37 and connected in parallel with resistor B76, diodes D44 and A series circuit of a capacitor C57 is connected, and a capacitor C58 is connected in parallel to the capacitor C57, and a variable resistor R38 and a variable resistor R38 are connected. And connected to the collector of transistor Q27.

In addition, a variable resistor via diode D45! Connected to? 42. Diode D43, diode D44, and diode D45 form an OR circuit, and have a detection level for dimming and a detection level for all-light. Detects the detection level for preheating and preheating, the detection level for preheating, the detection level for dimming, and the detection level for all light. The detection level becomes lower in the order of the levels, the highest detection level for preheating is given the highest priority, and the detection level is given priority in the order of the highest detection level It is done.

The AC voltage detector 55, the DC voltage detector 57 for dimming, and the DC voltage detector 58 for all light constitute a start control circuit 66.

Next, the operation of the embodiment shown in FIG. 10 will be described. Note that the basic operation is almost the same as the embodiment shown in FIG.

First, in the all-optical mode, the dimming terminal is connected to the ground terminal at the mode switching terminal 64, and the base current of the transistor Q26 is connected to the base of the transistor Q26. Is not supplied, the base current is supplied to transistor Q27, transistor Q27 is turned on, and diode D44 is bypassed. Disable the detection level of diode D44. Then, when the power is turned on, the capacitor C44 is charged, and during the preheating time when the capacitor C44 reaches a predetermined voltage, the transistor Q33 is turned on. In the off state, the Zener diode ZD12 is enabled in the DC voltage detector 58 for all light, and the detection level of the variable resistor R32 is set to the value for preheating. This is the detection level.

In such a state, the inverter circuit 36 performs a predetermined oscillating operation, and the high frequency is transmitted to the fluorescent lamp FL1 via the DC output line 38 and the DC cut line 39. Apply voltage. In addition, since no voltage is applied to the gate of the field effect transistor Q22, the gate between the source and the drain of the field effect transistor Q22 is not connected to the gate of the field effect transistor Q22. The impedance becomes very high, the capacitor C32 is not electrically connected, and only the capacitor C33 is connected, and the apparent combined capacitance decreases. As the frequency of the inverter circuit 36 increases, the output voltage decreases, and a voltage of about the discharge breakdown voltage is applied to the fluorescent lamp FL1. Glow discharge between the filament FLla and FLlb. Due to this single discharge, the fluorescent lamp FL1 generates a single discharge, and at the same time, the fluorescent lamp FL1 passes through the capacitor C29 for preheating. G Preheating current flows between FLla and FLlb due to a single current. Due to this preheating current, the filaments FLla and FLlb of the fluorescent lamp FL1 are preheated and become reddish, but the phosphor of the fluorescent lamp FL1 is caused by the global discharge. Also emits light, so the redness is relatively canceled out, It is less noticeable from the outside, and the redness of the filaments FLla and FLlb is less noticeable, and the user does not feel uneasy.

The inverter circuit 36 is connected to the drain of the field-effect transistor Q22 due to the decrease in the gate voltage of the field-effect transistor Q22. The impedance between the source and the source increases, the combined capacitance of capacitor C31 and capacitor C32 decreases, and the current The saturation time of the transistor CT11 is advanced, the lighting frequency of the transistor Q11 is increased, and the high-frequency output of the inverter circuit 36 is reduced. Conversely, as the gate voltage of the field-effect transistor Q22 increases, the drain-source connection of the field-effect transistor Q22 increases. As the impedance decreases, the combined capacitance of capacitor C31 and capacitor C32 increases, and the saturation time of the current transformer CT11 becomes longer. That is, the lighting frequency of the transistor Q11 decreases, and the high-frequency output of the inverter circuit increases.

After that, when the potential of the capacitor C54 reaches a predetermined potential and the preheating time is ended, a base current is supplied to the base of the transistor Q33 to supply the base current to the transistor Q33. By turning on the transistor Q33 and short-circuiting the Zener diode ZD12, the detection level of the DC voltage detector 58 for all light is lower than that of all light. It switches to the hourly detection level. Since the base current of the transistor Q33 increases, the gate voltage of the field-effect transistor Q22 increases, Conversely, the gate voltage of field effect transistor Q22 is reduced by reducing the base current of transistor Q33. Before the fluorescent lamp FL1 starts arc discharge, no DC component flows on the DC cut line 39, and the detection level does not rise. The base of the transistor Q33 is controlled based on the AC voltage detector 55. Then, based on the detection level, the inverter circuit 36i is controlled so that the secondary voltage is applied between the filaments FLla and FLlb of the fluorescent lamp FL1. The output is controlled.

When a voltage is applied in this way and the fluorescent lamp FL1 transfers to arc discharge and becomes lit, the fluorescent lamp FL1 becomes equivalent to a resistor and has no AC component. Therefore, it is detected by the AC voltage detector 55. That is, the control based on the detection level is released, and the control is switched to the lamp voltage control based on the detection level for all-light lighting, and the transistor is switched. In Q33, the base is controlled based on the detection level, and the gate voltage of the field effect transistor Q22 is controlled to control the capacitors C21 and C21. The output of the inverter circuit 36i is controlled by changing the apparent combined capacitance of the capacitor C32.

On the other hand, in the dimming mode, the detection level for dimming is enabled with the transistor Q27 turned off, and this detection level lights up all light. Since the detection level is higher than the time detection level, control is performed preferentially with respect to the base of the transistor Q33. Therefore, based on the detection level, the The inverter circuit 36 is controlled by controlling the gate voltage of the field-effect transistor Q22 by the transistor Q33. Note that when starting in the dimming mode, the rise in the detection level is delayed in time due to the charging of the capacitor C39, so even if the dimming mode is used, After one discharge, it can be started with high output.

Next, a state in which the fluorescent lamp FL1 has reached the end of its life will be described.

When the fluorescent lamp FL1 is normally lit, a current flows in the fluorescent lamp FL1 in both directions. Therefore, the first DC voltage detecting section 56 and the second DC voltage Since there is almost no potential difference in the detecting section 59, the transistor Q31 maintains the off state and the zener diode ZD13 also maintains the off state. No base current flows through the transistor Q29, and the programmable transistor transistor Q28 remains off. .

Then, when the fluorescent lamp FL1 reaches the end of its life, the emission of electrons from one of the filaments FLla and FLlb decreases, and a half-wave discharge is generated. When a half-wave discharge is generated in this manner, an electric potential difference is generated in the first DC voltage detecting section 56 and the second DC voltage detecting section 59, and the transistor Since Q31 is turned on and the diode ZD13 is turned on, a base current flows through the transistor Q29 and the programmable unit is turned on. Junction transistor Q28 is on and transistor Q31 has no base current When the transistor Q31 is turned off and the Zener diode ZD11 is turned on, the field effect transistor Q24 is turned off. ON, the base current of the transistor Q11 is forcibly bypassed, and the inverter circuit 36i is stopped to stop the transistor Q1. 1 to prevent stress.

In each of the above embodiments, a ring-shaped fluorescent lamp was used as the discharge lamp. However, a straight tube type may be used, and the lamp power may be arbitrarily set. is there . In addition, the main body of the fixture can be applied to a ceiling-mounted ceiling, pendant, or any other type.

In addition, the inverter circuit is used to illuminate each fluorescent lamp at high frequency, and if it can change the high frequency output, it is limited to a single stone type. It can be a two-stone half-bridge type, a four-stone full bridge type, or any other method. In particular, it is only necessary that the fluorescent lamp be subjected to a slight discharge at the time of starting, which causes a global discharge of the fluorescent lamp.

Furthermore, each detection level can be set arbitrarily by connecting a resistor or a zener diode in series or parallel. Okay.

Industrial applicability

As described above, the present invention is suitable for a discharge lamp lighting device for lighting a discharge lamp having a filament requiring preheating.

Claims

The scope of the claims

1. discharge lamp lighting means for lighting a discharge lamp having a filament;

A discharge detecting means for detecting the discharge of the discharge lamp; and when a discharge is detected by the discharge detecting means, the output of the discharge lamp lighting means is reduced to change the filament. Control means to preheat and

A discharge lamp lighting device characterized by comprising:

2. The discharge detection means is not DC connected to the discharge lamp lighting means

The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is characterized in that.

3. The discharge lamp lighting means preheats the filament in a state where a slight discharge is generated in the discharge lamp.

The discharge lamp lighting device according to claim 1 or 2, characterized by this.

4. The discharge detection means has a finolector that removes the lighting frequency of the discharge lamp.

Discharge lamp lighting device characterized by this.

5. Provided with a switching element for switching, having a pair of filaments and a tube diameter 2 with a phosphor. A variable output inverter circuit for applying a voltage between the filament and the filament of the discharge lamp of 1 mm or less; and An inverting control circuit that controls a switching operation of the switching element to vary an output of the inverting circuit;

Discharge detecting means for detecting the discharge of the discharge lamp is provided, and for a set pre-heating time, a discharge breakdown voltage is applied between the filaments of the discharge lamp to achieve a high level. Discharging, and after the elapse of the preheating time, a lamp secondary voltage for causing a transition to an arc discharge is applied between the filaments of the discharge lamp; When the discharge is detected by the discharge detecting means, the inverter control circuit is operated so as to decrease the voltage between the filaments of the discharge lamp. Start control circuit and

A discharge lamp lighting device characterized by comprising:

6. The circuit is connected to each of the filaments that make up a pair of discharge lamps, and a capacitor for DC cut is interposed between them. A direct current cut line in which the direct current component is cut, and a direct current output line in which the direct current component is not cut,

The discharge detecting means has a DC voltage detecting section for detecting a DC voltage of the DC cut line, and responds to a voltage value of the DC cut line detected by the DC voltage detecting section. The discharge lamp lighting device according to claim 5, wherein the discharge lamp lighting device outputs the same.

7. The circuit is connected to one of the filaments that make up a pair of discharge lamps, and is connected to the DC cut-off circuit. And a DC output line in which the DC component is cut by interposing an n-type capacitor, and a DC output line in which the DC component is not cut.

The discharge detecting means has a first DC voltage detecting section for detecting the DC voltage of the DC cut line, and a second DC voltage detecting section for detecting the DC voltage of the DC output line. And outputs according to the voltage difference between these DC voltage detectors and the second DC voltage detector.

The discharge lamp lighting device according to claim 6, characterized in that:

8. The inverter circuit is connected to each of the filaments that make up a pair of discharge lamps, and three capacitors for DC cut are interposed. And a DC output line from which the DC component is cut, and a DC output line from which the DC component is not cut.

The discharge detecting means has an AC voltage detecting section for detecting the AC voltage of the DC cut line, and detects a detection amount of the AC voltage detecting section according to the voltage on the DC cut line. Output to the secondary voltage control of the pump

The discharge lamp lighting device according to claim 7, characterized in that:

9. The DC voltage detection section of the discharge detection means has a DC voltage detection section for all light and a DC voltage detection section for y time, which are set with different detection levels. I got

The discharge lamp according to claim 8, characterized in that: Lighting device.

10. The DC voltage detector for all-light operation has a detection level switching means for changing the detection level between preheating and when all light is turned on.

The relationship between the detection level for preheating> the detection level for dimming> the detection level for all-lights on

The discharge lamp lighting device according to claim 9, wherein the discharge lamp lighting device is characterized in that:

1 1. The discharge detection means has a current detection unit for detecting the lamp current, and when the lamp current is detected, a signal is sent from the current detection unit to the start control circuit. Output

The discharge lamp lighting device according to claim 10, characterized in that:

1 2. The input and output circuits are respectively connected to one of the filaments forming a pair with the discharge lamp, and a capacitor for DC cut is interposed. A direct current cut line in which the direct current component is cut, and a direct current output line in which the direct current component is not cut.

It has a first DC voltage detector connected to the DC cut line, and a second DC voltage detector connected to the DC output line, and these first DC voltage detectors are connected to each other. It has an end-of-life detection circuit that outputs a detection amount corresponding to the voltage difference between the detection unit and the second DC voltage detection unit.

Based on the stop signal output by this end-of-life detection circuit, the switching element of the switching circuit of the Equipped with an oscillation stop circuit to stop the switching operation

The discharge lamp lighting device according to claim 5, characterized by this.

13 3. A plurality of inverter circuits are provided corresponding to a plurality of discharge lamps of different lamp powers having the same lighting frequency and different lamp powers.

It has a full-wave rectifier circuit for full-wave rectification of low-frequency AC power supply voltage, and is connected and connected to a plurality of invertor circuits provided for the different lamp power. Power input circuit and

A first capacitor having a capacity that does not exhibit a smoothing action with respect to a low frequency voltage. The first capacitor is connected to the power supply input circuit side more than the first capacitor. A second capacitor having a larger capacity than the first capacitor, and a capacitor between these first and second capacitors. A rectifier diode in which the first capacitor-side power source is switched by a high-frequency current based on the reactive power that is connected and regenerated on the input side. A smoothing capacitor and a series circuit of inductor elements connected in parallel to the first capacitor and including a series circuit of the inductor element, in front of the inverter circuit. Each connected multiple low distortion circuits and

The discharge lamp lighting device according to claim 5, characterized by comprising:

1 4. Inverter circuits are provided in multiple numbers corresponding to multiple discharge lamps of different lamp power with the same lighting frequency. Kere,

It has a full-wave rectifier circuit for full-wave rectification of low-frequency AC power supply voltage. Power input circuit and

A first capacitor having a capacity that does not exhibit a smoothing action with respect to a low frequency voltage. The first capacitor is connected to the power input circuit side more than the first capacitor. A second capacitor having a larger capacity than the first capacitor, and a capacitor between the first capacitor and the second capacitor. A rectifier diode in which the cathode of the first capacitor is switched by high-frequency current based on the reactive power that is connected and regenerated on the input side And a series circuit of a smoothing capacitor and an inductor element connected in parallel to the first capacitor, and a series circuit of the inductor element, which is provided at a stage preceding the inverter circuit. A plurality of low-distortion circuits connected to each other,

A circuit board on which each of the above-described circuit circuits is separately mounted for each block, and

A radiator plate mounted on a circuit board together with a switching element in a circuit of the inverter circuit at a position straddling the block.

15. The discharge lamp lighting device according to any one of claims 1 to 14, A lighting device, comprising: a fixture main body in which the discharge lamp lighting device is provided.

16. The discharge lamp lighting device according to any one of claims 1 to 14,

The discharge lamp is a ring-shaped fluorescent lamp having a tube diameter of 21 mm or less and having a different outer diameter, which is energized by each inverter circuit.

The instrument body is a disk that holds these multiple fluorescent lamps concentrically.

The lighting device according to claim 15, characterized by this.