JP5330768B2 - Electrodeless discharge lamp lighting device and lighting apparatus using the same - Google Patents

Description

  The present invention relates to an electrodeless discharge lamp lighting device and a lighting fixture using the same.

  Conventionally, a transparent spherical glass bulb or a spherical glass bulb coated with a phosphor on the inner wall surface has been filled with a discharge gas (for example, mercury vapor or rare gas) such as inert gas or metal vapor. An induction coil is arranged in the vicinity of the discharge lamp, and a high frequency current of several tens of kHz to several hundreds of MHz is passed through the induction coil, thereby generating a high frequency electromagnetic field in the induction coil and supplying high frequency power to the electrodeless discharge lamp. There is known an electrodeless discharge lamp lighting device that generates high-frequency plasma current in a glass bulb of an electrodeless discharge lamp to generate ultraviolet light or visible light. An example of such an electrodeless discharge lamp lighting device is disclosed in Patent Document 1.

  In this conventional example, as shown in FIG. 8, a DC power supply circuit 200 that creates a desired DC output from an AC output of a commercial power supply AC, and an electrodeless discharge lamp that converts the DC output of the DC power supply circuit 200 into a high-frequency output. A high-frequency power supply circuit 201 that is supplied to an induction coil 203 disposed in the vicinity of 204, a resonance circuit 202 that is provided between the output terminals of the high-frequency power supply circuit 201 and forms a load circuit together with the electrodeless discharge lamp 204, and a high-frequency power supply circuit When there is an abnormality in the power supply from 201 to the induction coil 203, the high-frequency output applied to the induction coil 203 is set to a size during which the electrodeless discharge lamp 204 is not lit and the size at which the electrodeless discharge lamp 204 is started. And a protection circuit 205 that controls the high-frequency power supply circuit 201 so as to alternately repeat the operation period to be performed. An overshoot circuit 206 is provided for changing the magnitude of the high-frequency output given to the induction coil 203 during the transition period from the protection period to the operation period between the magnitude during the protection period and the magnitude during the operation period. In FIG. 2, the high frequency output applied to the induction coil 203 is gently raised to prevent overshoot that occurs in the voltage across the induction coil 203.

  Incidentally, since the electrodeless discharge lamp 204 does not have an electrode inside, it is necessary to apply a starting voltage higher than that of the fluorescent lamp or the like to the induction coil 203 when the electrodeless discharge lamp 204 is started. For this reason, the sharpness of resonance at the time of starting the electrodeless discharge lamp 204 is sharpened (that is, the Q value of the resonance circuit 202 is set high), and an electrodeless discharge lamp that can apply a high starting voltage with low loss is lit. The device needs to be designed. Here, the sharp resonance means that the starting voltage greatly fluctuates with respect to fluctuations of minute frequencies and parameters of elements constituting the circuit.

  In addition, the electrodeless discharge lamp 204 at the time of start-up is an inductor load, and compared with other discharge lamps having electrodes such as a fluorescent lamp, the power is particularly large in a state where the lamp is not lit (startup, no-load, etc.). There is a problem of needing. For example, the power consumption of the high frequency power supply circuit 201 when there is no load may reach twice or more the power consumption during normal lighting. However, the DC power supply circuit 200 in the electrodeless discharge lamp lighting device is generally designed based on the load state during normal lighting in consideration of the size and cost of the device. Therefore, during start-up, particularly in a dark place or when there is no load, the voltage regulation of the DC power supply circuit 200 is not sufficient due to the heavy load, and the output voltage of the DC power supply circuit 200 decreases. As a result, there is a possibility that problems such as instability of the high-frequency voltage applied to the induction coil 203 and malfunction of the device may occur.

On the other hand, in the above conventional example, the high frequency voltage is not applied sharply to the induction coil 203 at the start, but the high frequency voltage of a predetermined output is set as a preliminary output before starting and before restarting (hereinafter, this period is referred to as “starting”). This is a configuration that is applied to the induction coil 203 (referred to as a “preparation period”). This configuration suppresses steep load fluctuations at the start by applying an appropriate load to the high-frequency power supply circuit 201, and is applied to the induction coil 203 at the start. The effect which prevents the overshoot of the high frequency voltage to be performed is acquired. In addition to this, since the control of the DC power supply circuit 200 is easy to follow the load fluctuation, the effect of supplying the DC voltage stably to the high-frequency power supply circuit 201 by suppressing the decrease in the output voltage of the DC power supply circuit 200 at the time of starting. Can be obtained. For this reason, the above conventional example can solve the above problems, but in order to sufficiently obtain the effect of suppressing the decrease in the output voltage of the DC power supply circuit 200, the voltage applied to the induction coil 203 in the start preparation period is not required. It is necessary to make it as large as possible within a range where the electrode discharge lamp 204 is not lit.
Japanese Patent Laid-Open No. 2005-158459

  By the way, there is a case where the output of the commercial power supply AC is reduced for a short time that is less than several hundred ms, that is, the power is instantaneously reduced (here, the low power includes a power failure in which the output becomes substantially zero). In this case, it is desired that the electrodeless discharge lamp 204 is re-lighted early after an instantaneous low power. However, as shown in FIG. 9, if a start preparation period similar to that when the electrodeless discharge lamp 204 is started for the first time is provided at the time of restart after an instantaneous low power, re-lighting after the instantaneous low power will be provided accordingly. There was a problem that it took a long time. Furthermore, as described above, since it is necessary to increase the voltage applied to the induction coil 203 as much as possible within a range in which the electrodeless discharge lamp 204 does not light during the start preparation period, the circuit is increased as the start preparation period at the time of restart increases. There has been a problem that the stress on the component parts increases.

  The present invention has been made in view of the above points, and shortens the time required for relighting at the time of restart after an instantaneous power failure and prevents an increase in stress on the components constituting the circuit. It is an object of the present invention to provide an electrodeless discharge lamp lighting device and a lighting fixture using the same.

  In order to achieve the above object, the invention of claim 1 includes a DC power supply circuit that converts an AC voltage from an AC power supply into a DC voltage and outputs it, and one or more switching elements and a resonance circuit that are switched at a high frequency. A high-frequency power supply circuit that converts the output voltage of the DC power supply circuit into a high-frequency voltage and supplies the high-frequency voltage to an induction coil disposed close to the electrodeless discharge lamp; a drive circuit that outputs a drive signal for switching the switching element; and a drive circuit The start circuit that starts the electrodeless discharge lamp by changing the voltage applied to the induction coil by controlling the frequency of the drive signal and the instantaneous low power of the voltage supplied from the AC power supply to the DC power supply circuit A start-up circuit for applying a high-frequency voltage of a magnitude that does not start the electrodeless discharge lamp to the induction coil; The electrodeless discharge lamp is started after a start-up period in which a high-frequency voltage that can be started by the polar discharge lamp is applied to the induction coil, and when the instantaneous low-power detection circuit detects an instantaneous low-power, preparation for starting at restart The drive circuit is controlled so that the period is shorter than the start preparation period other than the start preparation period after the instantaneous low power.

  According to a second aspect of the present invention, in the first aspect of the invention, the starting circuit is driven to apply a high-frequency field discharge voltage for generating a high-frequency field discharge to the induction coil until the high-frequency field discharge is generated in the start preparation period. The circuit is controlled, and the drive circuit is controlled so that a high-frequency electromagnetic discharge voltage for generating a high-frequency electromagnetic discharge is applied to the induction coil during the starting period.

  The invention according to claim 3 is an electrode body according to claim 1 or 2, wherein at least an appliance main body for holding the electrodeless discharge lamp, an induction coil disposed close to the electrodeless discharge lamp, and high frequency power is supplied to the induction coil. And a discharge lamp lighting device.

  According to the invention of claim 1, by shortening the start preparation period after the instantaneous low power that can be re-lighted immediately even if the start preparation period is short, the re-lighting at the time of restart after the instantaneous low power The time required can be shortened. Further, by shortening the start preparation period in which the high voltage is applied, it is possible to prevent an increase in stress on the components constituting the circuit.

  According to the invention of claim 2, since the high frequency electromagnetic field discharge is generated in the starting period after the high frequency electric field discharge is generated in the starting preparation period, it is compared with the case of starting the electrodeless discharge lamp without providing the starting preparation period. Thus, startability can be improved. In addition, since the transition to the start period after generating the high frequency electric field discharge, the high frequency electromagnetic field discharge can be generated immediately and the start period during which the high voltage is applied to the induction coil can be shortened. It is possible to reduce stress on the parts to be performed.

  According to the invention of claim 3, it is possible to realize a lighting fixture that exhibits the effect of the invention of claim 1 or 2.

(Embodiment 1)
Hereinafter, Embodiment 1 of the electrodeless discharge lamp lighting device according to the present invention will be described with reference to the drawings. In the present embodiment, as shown in FIG. 1, a DC power supply circuit 1 that converts an AC voltage from a commercial power supply AC, which is an AC power supply, into a DC voltage and outputs it, and two switching elements Q2 and Q3 that are switched at a high frequency. A high-frequency power supply circuit 2 that includes a resonance circuit 21 and converts the output voltage of the DC power supply circuit 1 into a high-frequency voltage Vcoil and supplies it to the induction coil 3 disposed close to the electrodeless discharge lamp 4; and switching elements Q2 and Q3. A drive circuit that outputs a drive signal to be switched, a starter circuit that starts the electrodeless discharge lamp 4 by gradually increasing the voltage applied to the induction coil 3 by controlling the drive circuit and changing the frequency of the drive signal; And an instantaneous low power detection circuit 5 that detects an instantaneous low power of a voltage supplied from the power source AC to the DC power supply circuit 1. In the present embodiment, the driving circuit and the starting circuit are collectively configured in the control unit 20 including an integrated circuit (IC) having any function.

  The DC power supply circuit 1 includes a rectifier circuit 10 that rectifies an AC output of a commercial power supply AC, a well-known booster that includes a drive circuit 11 that drives an inductor L1, a diode D1, a switching element Q1, a smoothing capacitor C1, and a switching element Q1. It consists of a chopper circuit and outputs a DC voltage Vdc. The rectifier circuit 10 includes a series circuit of resistors R1 and R2 connected between output terminals of the rectifier circuit 10 and a capacitor C4 connected in parallel with the resistor R2. A voltage detection circuit 12 for dividing and detecting the voltage is provided.

  The high-frequency power supply circuit 2 includes a pair of switching elements Q2 and Q3 connected in series between the output terminals of the DC power supply circuit 1, and a resonance circuit 21 including an inductor L2 and capacitors C2 and C3 is connected to the low-side switching element Q3. The so-called half-bridge type inverter circuit is configured to resonate by switching a pair of switching elements Q2 and Q3 made of field effect transistors alternately by driving signals VDH and VDL of rectangular wave pulses output from the driving circuit. A high frequency voltage Vcoil is supplied to the induction coil 3 via the circuit 21. The driving signal VDH for driving the switching element Q2 and the driving signal VDL for driving the switching element Q3 have a phase difference of about 180 degrees.

  As shown in FIG. 2, the starting circuit includes a start preparation period in which a high-frequency voltage Vcoil having a magnitude that does not start the electrodeless discharge lamp 4 is applied to the induction coil 3, and a high-frequency that can start the electrodeless discharge lamp 4. The electrodeless discharge lamp 4 is started through a starting period in which the voltage Vcoil is applied to the induction coil 3. The operation of the starting circuit is similar to the operation of the overshoot prevention circuit 206 of the conventional example and is well known, and therefore detailed description thereof will be omitted here. Further, as a function different from the overshoot prevention circuit 206 of the conventional example, there is a function of controlling the length of the start preparation period in accordance with a control voltage Vm from an operational amplifier OP1 described later.

  An induction coil 3 formed by winding a plurality of conductive wires is connected to the output end of the resonance circuit 21, and the electrodeless discharge lamp 4 is disposed close to the induction coil 3. As shown in FIG. 5A, the electrodeless discharge lamp 4 includes a transparent substantially spherical bulb 40 in which a discharge gas (for example, mercury and a rare gas) such as an inert gas or a metal vapor is sealed, and a bulb 40. And a substantially cylindrical cavity 41 projecting inward of the valve 40, and a coupler 7 for holding the valve 40 and positioning the induction coil 3 with respect to the valve 40 is inserted into the cavity 41. .

  As illustrated in FIG. 5B, the coupler 7 includes a bobbin 70 that holds the induction coil, and a substantially cylindrical core 71 that is housed inside the bobbin 70. The core 71 is made of, for example, Mn—Zn ferrite having good high-frequency magnetic characteristics, and is held by a radiator (not shown) formed of a metal material such as aluminum. The heat generated by the core 71 is thrown away to the pedestal portion 72 via the radiator. As shown in the figure, both of the present embodiment and each of the embodiments described later are housed in a case 73 and electrically connected to the induction coil 3 via the output line 74, whereby high frequency output is induced. 3 is supplied.

  The instantaneous low power detection circuit 5 is inserted between a reference power supply circuit 50 that is supplied with a voltage from the smoothing capacitor C1 and generates a reference voltage at the output end, and between the output end of the reference power supply circuit 50 and the output end on the low voltage side of the rectifier circuit 10. A series circuit of a resistor R3 and a capacitor C5, and a switching element Q4 inserted between the output terminal of the reference power supply circuit 50 and the resistor R3. Capacitor C5 is charged. The switching element Q4 is formed of a pnp transistor, and is turned on when the base is connected to the connection point of the resistors R1 and R2 in the voltage detection circuit 12 so that the potential at the connection point of the resistors R1 and R2 becomes smaller than a predetermined potential. . The inverting input terminal includes an operational amplifier OP1 to which a voltage obtained by dividing the output voltage of the reference power supply circuit 50 by the resistors R6 and R7 is input, and a voltage Vc across the capacitor C5 is input to the non-inverting input terminal. When the voltage Vc across the capacitor C5 becomes larger than the voltage obtained by dividing the output voltage of the reference power supply circuit 50, the control voltage Vm is supplied to the control unit 20. Further, a resistor R4 is provided between the connection point of the switching element Q4 and the resistor R3 and the output terminal on the low voltage side of the rectifier circuit 10 so that the charge charged in the capacitor C5 can be discharged by turning off the switching element Q4. Has been inserted.

  Hereinafter, the operation of the present embodiment will be described with reference to FIGS. First, when the supply of voltage from the commercial power supply AC to the DC power supply circuit 1 is started, the output voltage Vdc of the DC power supply circuit 1 rises, the start circuit controls the drive circuit, and the start preparation period (from time t1 to time) (until t2) A high frequency voltage Vcoil as large as possible is applied to the induction coil 3 within a range where the electrodeless discharge lamp 4 is not lit.

  Here, at the start of voltage supply, the switching element Q4 is turned on in the instantaneous low voltage detection circuit 5, but the operating voltage is not supplied to the operational amplifier OP1 because the smoothing capacitor C1 is not charged. There is no input to the controller 20. After a certain period of time, the smoothing capacitor C1 is charged and the operating voltage is supplied to the operational amplifier OP1. At this time, the potential at the connection point of the resistors R1 and R2 in the voltage detection circuit 12 becomes larger than the predetermined potential, so that switching is performed. The element Q4 is turned off, and therefore the control voltage Vm is not input to the control unit 20. This state is maintained until an instantaneous low power is generated.

  Next, when the start preparation period elapses, the start circuit controls the drive circuit to apply a high-frequency voltage Vcoil having a magnitude capable of starting the electrodeless discharge lamp 4 to the induction coil 3. After a certain period, the electrodeless discharge lamp 4 is turned on, the high frequency voltage Vcoil is lowered (time t3), and the lighting state is maintained. The starting period is from time t2 to time t3, and the lighting period is after time t3. When a momentary low power occurs at time t4 after the lighting state is maintained for a while, the DC power supply circuit 1 and the high-frequency power supply circuit 2 are stopped, the voltage supply to the induction coil 3 is also stopped, and the electrodeless discharge lamp 4 Goes off. Then, when the voltage supply from the commercial power supply AC is restored at time t5, the voltage is supplied to the DC power supply circuit 1 and the high frequency power supply circuit 2 to restart the electrodeless discharge lamp 4 (time t5).

  Here, since the potential at the connection point of the resistors R1 and R2 in the voltage detection circuit 12 temporarily falls below a predetermined potential during an instantaneous low power, the switching element Q4 of the instantaneous low power detection circuit 5 is turned on and the capacitor C5 is charged. Is started. When the voltage Vc across the capacitor C5 becomes larger than the voltage obtained by dividing the output voltage of the reference power supply circuit 50, the control voltage Vm is input from the operational amplifier OP1 to the control unit 20. After the power recovery, the potential at the connection point of the resistors R1 and R2 in the voltage detection circuit 12 becomes larger than the predetermined potential, so that the switching element Q4 is turned off and the capacitor C5 starts to be discharged via the resistor R4. At this time, the constants of the respective elements are set so that the voltage Vc across the capacitor C5 becomes larger than the voltage obtained by dividing the output voltage of the reference power supply circuit 50 for a certain period, and the constant period (from time t5 to time t6). Until the control voltage Vm is input to the control unit 20.

  When the control voltage Vm is not input, the control unit 20 controls the electrodeless discharge lamp 4 to start after a predetermined start preparation period and a start period as described above, but the control voltage Vm is input. Then, the control unit 20 performs control so that the period during which the control voltage Vm is input to the control unit 20 is a start preparation period, and the control period Vm is shifted to the start period when the control voltage Vm is not input. Here, in this embodiment, the period during which the control voltage Vm is input to the control unit 20 is set to be shorter than the normal start preparation period. Usually, in order to start the electrodeless discharge lamp 4, it is necessary to lengthen the starting period when it is difficult to start in a dark place or at a low temperature, and when the electrodeless discharge lamp 4 is started for the first time. Accordingly, it is necessary to provide a sufficient start-up preparation period. However, since the electrodeless discharge lamp 4 is lit once after the instantaneous low power, this situation does not occur. Therefore, at the time of restart after an instantaneous low power, since the electrodeless discharge lamp 4 is turned on immediately after the start period, the decrease in the output voltage Vdc of the DC power supply circuit 1 is small, so there is no need to worry about preparation for starting. There is no problem even if the period is shortened compared to the case of starting for the first time.

  Thus, as described above, even if the start preparation period is short, the start preparation period after the instantaneous low power that can be turned on immediately is shortened. Time can be shortened. Further, by shortening the start preparation period in which the high voltage is applied, it is possible to prevent an increase in stress on the components constituting the circuit. In this embodiment, the start preparation period after the instantaneous low power is shortened, but the start preparation period is extremely shortened to be substantially zero, that is, there is no start preparation period after the instantaneous low power. It does not matter.

  Although the present embodiment operates by supplying an AC voltage from the commercial power supply AC to the DC power supply circuit 1, as shown in FIG. 3, the commercial power supply AC and, for example, a sealed Ni—Cd storage battery 2 The power supply device B connected to the secondary battery BT may be connected to the input terminal of the DC power supply circuit 1. In this case, normally, by supplying an AC voltage from the commercial power source AC to the DC power source circuit 1, the electrodeless discharge lamp 4 is turned on, the secondary battery BT is charged, and the power supply from the commercial power source AC is shut off. In an emergency, the electrodeless discharge lamp 4 can be turned on by supplying a DC voltage from the secondary battery BT to the DC power supply circuit 1.

  By the way, the start of the electrodeless discharge lamp 4 needs to consider the bulb 40 and the induction coil 3 as a whole unlike the general electrode discharge lamp, and there are the following two modes of discharge. As a discharge sequence, when a high frequency voltage Vcoil is applied to the induction coil 3, the gas in the bulb 40 is excited through the lamp tube wall of the induction coil 3 and the electrodeless discharge lamp 4, and a high frequency electric field discharge (hereinafter, (Referred to as “E discharge”), and a discharge seed is created, resulting in a glow discharge state. Thereafter, when a higher high-frequency voltage Vcoil is further applied to the induction coil 3, a high-frequency electromagnetic field discharge (hereinafter referred to as “H discharge”) is generated, and the electrodeless discharge lamp 4 is lit to enter a stable arc discharge state. .

  First, the E discharge will be described. The E discharge is a discharge current that flows through the capacitance of the lamp tube wall of the electrodeless discharge lamp 4. When the high frequency voltage Vcoil is applied to the induction coil 3, the induction coil 3 and the electrodeless discharge are discharged. The gas in the bulb 40 is excited through the electrostatic capacity of the lamp tube wall of the lamp 4 to emit light. This discharge becomes a slight discharge (glow discharge state), and shifts to the main discharge when the high-frequency voltage Vcoil applied to the induction coil 3 is increased.

  Next, the H discharge will be described. The H discharge is to cause an induction current to flow by electromagnetic induction of the induction coil 3, and the induction coil 3 is a primary winding of a plurality of turns, and the plasma ring generated in the bulb 40 is a secondary winding of one turn. Can be understood as a transformer. Here, the H discharge is a main discharge (arc discharge state) that contributes to the light emission of the electrodeless discharge lamp 4.

  In the present embodiment, an E discharge is generated by applying a high frequency voltage Vcoil having such a magnitude that an E discharge is generated in the induction coil 3 and no H discharge is generated in the start preparation period, and the induction coil 3 is generated in the start period. The electrodeless discharge lamp 4 is turned on by generating a H discharge by applying a high-frequency voltage Vcoil that is large enough to generate an H discharge. For this reason, E discharge can be generated even if there is some variation in ambient conditions such as dark places and low temperatures in the start preparation period. Further, since the start period is shifted to after the E discharge is generated, the H discharge can be immediately generated and the start period for applying the high voltage to the induction coil 3 can be shortened. Thus, the startability of the electrodeless discharge lamp 4 can be improved as compared with the case where the electrodeless discharge lamp 4 is started without providing a start preparation period, and the stress on the parts constituting the circuit is reduced. be able to.

(Embodiment 2)
Hereinafter, Embodiment 2 of the electrodeless discharge lamp lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the first embodiment, it is assumed that an instantaneous low power is generated in a state where the electrodeless discharge lamp 4 has been started once. However, when the electrodeless discharge lamp 4 is started for the first time, the electrodeless discharge lamp 4 is turned on. It is not assumed that there was an instantaneous low power before. In this case, since the electrodeless discharge lamp 4 is not yet lit, the restart after the instantaneous low power may be a start in a situation where starting is difficult in a dark place or at a low temperature. Therefore, when the same control as that of the first embodiment is performed, the voltage preparation of the DC power supply circuit 1 is not sufficient because the start preparation period at the time of restart is short, and the output voltage of the DC power supply circuit 1 is lowered, so that the startability is improved. Deteriorating. Therefore, in the present embodiment, as shown in FIG. 4, when the electrodeless discharge lamp 4 is started for the first time, the start preparation period is shortened when an instantaneous low power occurs before the electrodeless discharge lamp 4 is turned on. Thus, the mask circuit 6 is provided to prevent the control unit 20 from being controlled.

  In the mask circuit 6, the voltage across the smoothing capacitor C1, that is, the output voltage Vdc of the DC power supply circuit 1 is input to the non-inverting input terminal, and the low-voltage side output terminal of the rectifier circuit 10 is connected to the inverting input terminal. An operational amplifier OP2, a delay circuit connected to the output terminal of the operational amplifier OP2 and composed of a resistor R8 and a capacitor C6, and an output terminal of the operational amplifier OP1 of the instantaneous low power detection circuit 5 and the control unit 20 are inserted. The switch SW is turned on when the output voltage exceeds a predetermined voltage.

  Hereinafter, the operation of this embodiment will be described. First, when voltage supply from the commercial power supply AC to the DC power supply circuit 1 is started, the smoothing capacitor C1 is charged, and accordingly, the capacitor C6 of the mask circuit 6 is also charged through the resistor R8. When the voltage across the capacitor C6 exceeds a predetermined voltage, the switch SW is turned on, and the output terminal of the operational amplifier OP1 of the instantaneous low power detection circuit 5 and the control unit 20 are connected. That is, the control voltage Vm may be input to the control unit 20 even during a certain period from when the voltage supply starts to when the switch SW is turned on, even if an instantaneous low power is generated and restarted. Absent.

  Accordingly, by appropriately setting the constants of the resistor R8 and the capacitor C6, even if an instantaneous low power occurs before the electrodeless discharge lamp 4 is turned on when the electrodeless discharge lamp 4 is started for the first time, the instantaneous low power Since the control for shortening the start preparation period is not performed during the subsequent restart, it is possible to prevent the startability from being deteriorated. Since the switch SW is always on after the predetermined period has elapsed, the same operation as in the first embodiment can be performed.

  In addition, each said embodiment is mounted and used for the fixture main body of lighting fixtures, such as a street light and a crime prevention light, with the electrodeless discharge lamp 4. FIG. For example, as shown in FIG. 6 (a), a crime prevention light in which an appliance main body 100 in which an electrodeless discharge lamp 4 is housed is attached to a support pole 101 such as a utility pole provided on a road, or a security light shown in FIG. 6 (b). As shown in the figure, for example, a security light comprising a shade-shaped fixture body 110, a prism 111 constituting a reflecting portion, a lamp socket portion 112 provided at the base of the prism 111, and a circuit housing portion 113 provided below the lamp socket portion 112. Used.

  Further, as shown in FIGS. 7A to 7C, any one of the above-described tunnel lights including a flat box-shaped instrument body 120 and a reflection plate 121 that reflects light from the electrodeless discharge lamp 4. The electrodeless discharge lamp lighting device A of the embodiment may be mounted. In addition, the electrodeless discharge lamp 4 has an advantage that it has a long life and requires less frequent maintenance, and has a great advantage of being adopted for a tunnel lamp that is troublesome to maintain. Moreover, in order to improve the safety in the tunnel, it is desired that the tunnel light be restored and re-lighted as soon as possible after a power failure. Here, if the electrodeless discharge lamp lighting device of each of the above embodiments is employed, the electrodeless discharge lamp 4 can be restarted immediately after switching to the emergency power supply after an instantaneous power failure, so that the tunnel is turned off at the time of the power failure. Time is shortened, and as a result, safety in the tunnel can be improved.

  Of course, the lighting fixture on which each of the above embodiments is mounted is not limited to the above-described one, and at least a fixture main body (not shown) that holds the electrodeless discharge lamp 4 and the electrodeless discharge lamp 4 are disposed in proximity to each other. The lighting fixture provided with the induction coil 3 to be used may be used.

It is a circuit diagram which shows Embodiment 1 of the electrodeless discharge lamp lighting device which concerns on this invention. It is a time chart which shows operation | movement same as the above. It is a circuit diagram which shows the case where the power supply device same as the above is provided. It is a circuit diagram which shows Embodiment 2 of the electrodeless discharge lamp lighting device which concerns on this invention. It is explanatory drawing of the site | part relevant to the electrodeless discharge lamp lighting device of this invention, (a) is sectional drawing of an electrodeless discharge lamp, (b) is a perspective view of a coupler. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the lighting fixture using the electrodeless discharge lamp lighting device of this invention, (a) is a side view of a crime prevention light, (b) is the partially broken front view of the crime prevention light different from (a). . It is a figure which shows a tunnel light same as the above, (a) is a front view, (b) is a side view, (c) is a side view seen from the direction different from (b). It is a circuit diagram which shows the conventional electrodeless discharge lamp lighting device. It is a time chart which shows operation | movement same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 DC power supply circuit 2 High frequency power supply circuit 20 Drive circuit / starting circuit 21 Resonance circuit 3 Inductive coil 4 Electrode discharge lamp 5 Instantaneous low power detection circuit Q2, Q3 Switching element

Claims (3)

  A DC power supply circuit that converts an AC voltage from an AC power supply into a DC voltage and outputs the DC voltage, and one or more switching elements that are switched at a high frequency and a resonance circuit, and converts the output voltage of the DC power supply circuit to a high frequency voltage. A high frequency power supply circuit for supplying to an induction coil arranged close to the electrodeless discharge lamp, a drive circuit for outputting a drive signal for switching the switching element, and an induction coil by controlling the drive circuit to change the frequency of the drive signal A starting circuit for starting the electrodeless discharge lamp by varying the voltage applied to the power source, and an instantaneous low power detecting circuit for detecting an instantaneous low power of the voltage supplied from the AC power source to the DC power source circuit. A start-up preparation period in which a high-frequency voltage large enough to prevent the electrodeless discharge lamp from starting is applied to the induction coil, and a high-frequency voltage large enough to start the electrodeless discharge lamp. The electrodeless discharge lamp is started after the start period applied to the coil, and when the instantaneous low power detection circuit detects the instantaneous low power, the start preparation period at restart is other than the start preparation period after the instantaneous low power An electrodeless discharge lamp lighting device, wherein a drive circuit is controlled to be shorter than a period.   The starting circuit controls the drive circuit to apply a high-frequency field discharge voltage for generating a high-frequency electric field discharge to the induction coil until the high-frequency electric field discharge is generated in the start-up preparation period. 2. The electrodeless discharge lamp lighting device according to claim 1, wherein the driving circuit is controlled so as to apply a high-frequency electromagnetic field discharge voltage for generating a voltage to the induction coil. The apparatus main body which hold | maintains an electrodeless discharge lamp at least, the induction coil arrange | positioned close to an electrodeless discharge lamp, and the electrodeless discharge lamp lighting device of Claim 1 or 2 which supplies high frequency electric power to an induction coil A lighting apparatus characterized by that.

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