WO1992002113A1

WO1992002113A1 - Starter device for turning a discharge lamp on

Info

Publication number: WO1992002113A1
Application number: PCT/JP1991/000993
Authority: WO
Inventors: Koichi Ishida
Original assignee: Takayama, Yukihiro
Priority date: 1990-07-24
Filing date: 1991-07-24
Publication date: 1992-02-06
Also published as: AU8227591A

Abstract

The title device comprises a discharge means including a discharge lamp (15) adapted to start and turn with a voltage applied from a power source (10) through a rectifier (12), an operational amplifier (20) and a pulse width control circuit (21) cooperate to step up or down said rectified voltage to generate a high voltage enough to start the discharge lamp, and a choke coil (14) which superposes a predetermined pulsating voltage determined by the inductance characteristics on the supply voltage; and a turn-on means including a resistor (16) for detecting the electric discharge current of said discharge lamp (15), and the operational amplifier (20) and the pulse width control circuit (21) which cooperate to step down said supply voltage after the discharge lamp (15) started discharging.

Description

' Specification

Start-up lighting device for discharge lamps-technology field

The present invention relates to a starting device for a discharge lamp that initially discharges a high-pressure discharge lamp such as a mercury lamp, a high-pressure sodium lamp, and a metal halide lamp.

Background technology

In a start-up lighting device for a discharge lamp, an electromagnetic start-up ballast such as an iron-core type winding or leakage transformer is used. In this start-up lighting device, an AC voltage from a commercial AC power supply is rectified to a constant DC high voltage by a rectifier and supplied to a high-pressure discharge lamp to discharge the high-pressure discharge lamp. In addition, since the discharge starting voltage of the high-pressure discharge lamp is higher than the normal lighting sustaining voltage, and especially the difference between the sodium lamp and the like is large, in the above-mentioned electromagnetic ballast, it is necessary to change the reactance of the choke transformer of the circuit. In order to solve this problem, when a higher firing voltage was required, the ripple in the reactance of the circuit was used.

However, since high-pressure discharge lamps often consume large amounts of power, electromagnetic ballasts are accordingly large, heavy, and expensive, and the above-mentioned ballasts are optional for high-pressure discharge lamps. One of the drawbacks was that it was unable to respond to dimming when it was necessary.

Therefore, an electronic circuit is used instead of the electromagnetic ballast. Although an electronic ballast that has been proposed has been proposed, the electronic ballast requires a start-up lighting device that applies a start-up voltage to start discharge of a discharge lamp.

Disclosure of the invention

An object of the present invention is to provide a starting and lighting device for a discharge lamp that can easily obtain a discharge starting voltage higher than a normal lighting sustaining voltage.

Another object of the present invention is to provide a start-up lighting device for a discharge lamp capable of performing normal lighting with a steady discharge maintaining voltage when the discharge of the discharge lamp is started.

Still another object of the present invention is to provide a starting and lighting device for a discharge lamp that can remove the influence of electromagnetic waves radiated from the discharge lamp into the air.

In order to achieve the above object, a starting and lighting device for a discharge lamp according to the present invention includes a discharge lamp that is supplied from a power supply and starts and lights based on a rectified voltage, and that discharges the rectified voltage to the discharge lamp. Discharge means for setting the high voltage to start the discharge of the discharge lamp and discharging the discharge lamp; and lighting means for reducing the voltage and lighting the discharge lamp after the discharge lamp discharges.

As described above, the present invention rectifies a power supply voltage supplied from a power supply, pressurizes the rectified voltage, supplies a starting voltage higher than a discharge starting voltage to a discharge lamp, and starts discharging. Then, the above voltage is reduced to maintain a steady discharge. It shifts to lighting. For this reason, it becomes possible to supply a starting voltage higher than the discharge starting voltage, and in the present invention, the discharge lamp can be rapidly discharged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp starting and lighting device according to the present invention, and FIG. Fig. 3 shows the terminal voltage characteristics of the discharge lamp shown in Fig. 3, Fig. 3 shows the output waveform of the voltage applied to the discharge lamp at the start of discharge, and Fig. 4 shows the relationship between the power supply voltage and the illuminance. FIG. 5, FIG. 5 is a diagram showing a relationship between power supply voltage and power consumption, FIG. 6 is a circuit diagram showing another embodiment of a starting and lighting device for a discharge lamp according to the present invention, and FIG. 7 is a diagram in FIG. FIG. 8 is a diagram showing the terminal voltage characteristics of the discharge lamp shown, FIG. 8 is a circuit diagram showing another embodiment of the discharge lamp starting and lighting device according to the present invention, and FIG. 9 is a start-up of the discharge lamp according to this invention FIG. 10 is a circuit diagram showing still another embodiment of the lighting device. FIG. 10 is a configuration showing an embodiment in which the starting lighting device according to the present invention is converted to an inverter. Fig. 11 is a block diagram of a discharge lamp provided with a transparent conductive film coating layer, Fig. 12 is a block diagram of a discharge lamp provided with a conductive net, and Fig. 13 is a discharge lamp. FIG. 4 is a diagram showing a configuration in a case where a transparent lid that is coated with a transparent conductive film or a conductive net is provided on the lamp.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 13. This will be described with reference to FIG.

Referring to FIG. 1, a power supply voltage from a commercial AC power supply 10 is boosted by an auto transformer 11 and further rectified to a DC voltage by a rectifier 12. The DC voltage rectified by the rectifier 12 is applied to the choke coil 14 via a switching transistor 13 as a discharge starting voltage. In the embodiment, an auto transformer is used, but the present invention is not limited to this, and an n-fold voltage rectifier may be used.

The coil 14 supplies the discharge lamp 15 such as a mercury lamp with a voltage obtained by superimposing a predetermined pulsating voltage on the discharge start voltage. The discharge starting voltage is suppressed by the inductance characteristics of the coil 14 and gradually approaches the discharge sustaining voltage.

The discharge lamp 15 starts discharging as soon as a discharge starting voltage sufficient to start this discharge is supplied. For example, if the steady discharge current of the discharge lamp 15 in the state after the gas activation is 2.3 [A] and the terminal voltage at that time is 100 [V], the terminal voltage characteristics of the discharge lamp 15 are as follows. However, when starting the discharge, it is desirable to change as shown in FIG. Therefore, in this embodiment, the discharge is started by applying a voltage as shown by the output waveforms in FIGS. 3 (a) to 3 (d) to the discharge lamp 15. That is, FIG. 3 (a) shows the start of discharge, the output waveform is an intermittent mode, and 0.2 [A] flows as the discharge current. Fig. 3 (b) shows one minute after the start of discharge, and the output waveform is in the intermittent mode. 0.89 [A] is flowing as the discharge current. Fig. 3 (c) shows four minutes after the start of discharge, and 2.1 [A] flows as the discharge current. Fig. 3 (d) shows 5 minutes after the start of the discharge, and the discharge current is 2.3 [A].

The resistor 16 is a resistor for detecting a discharge current through which a discharge current generated by the discharge of the discharge lamp 15 flows. When the discharge current flows through the resistor 16, a voltage is generated at the + terminal of the operational amplifier 20. The resistors 17 and 18 set the reference voltage for making the current flowing through the discharge lamp 15 into a steady discharge current (2.3 [A] in the embodiment) when the discharge lamp 15 is discharged. It is a voltage dividing resistor for setting. The voltage dividing resistors 17 and 18 apply a reference voltage set based on the voltage from the power supply 19 to one terminal of the operational amplifier 20.

The operational amplifier 20 compares the voltage supplied to the tenth terminal and applies an output voltage that changes according to the comparison result to a pulse width control circuit (hereinafter, referred to as “PWM”) 21. .

When the output voltage from the operational amplifier 20 is applied, the PWM 21 increases or decreases the pulse width of the output pulse according to the output voltage, and adds the increased or reduced pulse width voltage to the base of the transistor 13. ing.

When the above voltage is applied, the transistor 13 is turned on according to the pulse width, and the discharge starting current from the rectifier 12 is turned on. The voltage is applied to the coil 14 only during the time when the transistor 13 is on. -Next, the operation of the start-up lighting device shown in Fig. 1 will be described. The power supply voltage from the commercial power supply 10 is boosted to a voltage sufficient to start discharging in the autotransformer 11 and is applied to the collector of the transistor 13. At this point, the pulse width of PWM 21 is the maximum pulse width because the discharge current has not yet flowed through resistor 16. As a result, the transistor 13 is fully opened, and a sufficient starting voltage is applied to the discharge lamp 15 via the coil 14 to start discharging. The discharge lamp 15 immediately starts discharging as shown in FIG. When the discharge starts, a discharge current flows through the resistor 16 and a discharge voltage is generated at the + terminal of the operational amplifier 19. The reference voltage divided by the voltage dividing resistors 17 and 18 is applied to one terminal of the operational amplifier 19. The voltage at the output terminal of the operational amplifier 19 changes according to the reference voltage and the discharge voltage. When the voltage at the output terminal changes, PWM 21 reduces the pulse width of the output pulse to be output. Accordingly, the on-time of the transistor 13 is controlled and acts in a voltage decreasing direction to lower the voltage applied to the discharge lamp 15 to a steady discharge maintaining voltage. The current flowing through the discharge lamp 15 is maintained at a preset current value and shifts to a normal lighting state. As a result, the gas in the discharge lamp 15 is activated and can be turned on. After the discharge lamp 15 turns on, the PWM 2 1 is to control the pulse width of the transistor 13 so that the discharge current flowing through the discharge lamp 15 becomes the set current (2.3 [A] in this embodiment), set the terminal voltage to 100 [V], Set the discharge current to 2.3 [A]. Thus, the discharge lamp 15 can continue stable discharge.

Therefore, when the power supply voltage (100 [V]) of the commercial power supply rises during a time when the load is low, such as at midnight, the conventional transformer-type ballast requires the discharge of a mercury lamp tube or the like as shown in Fig. 4. The illuminance of the lamp 15 becomes unnecessarily bright, resulting in a significant increase in power consumption and a reduction in the life of expensive mercury lamps, as shown in FIG. If the start-up lighting device of this embodiment is used as an electronic ballast, even if the power supply voltage of the commercial power supply fluctuates, the electronic ballast is controlled by the pulse width control of the PWM 21 at startup. Apply the same discharge starting voltage as the sustaining voltage to the discharge lamp. Then, the electronic ballast can be added to the discharge lamp by gradually increasing the voltage so as to have a constant discharge maintaining voltage after the start of the discharge.

Thus, in this embodiment, constant illuminance and constant power that always maintain constant illuminance and power can be realized, and the discharge lamp can be discharged with constant power consumption.

In addition, by appropriately setting the start-up lighting device, power consumption efficiency is improved, and power consumption can be reduced by about 10% to 20% at constant illuminance.

In addition, continuous modulation light can be adjusted by adjusting the discharge current of the starting lighting device. Becomes possible.

In addition, since the discharge lamp can be discharged with a constant power, it is possible to provide high-quality lighting without flicker. FIG. 6 is a circuit diagram showing another embodiment of the discharge lamp starting and lighting device according to the present invention, in which a discharge lamp having a high starting voltage such as a sodium lamp is started and lit. In FIG. 6, the same components as those in FIG. 1 described above have the same reference numerals, and are omitted for convenience of description.

Note that, for example, the steady-state current of the discharge lamp 15 after gas activation is 2.3 [A], the terminal voltage at that time is 100 [V], and the discharge lamp 15 has a Assuming that a current of about 6 [A] flows, it is desirable that the terminal voltage characteristics of the discharge lamp 15 be changed as shown in FIG. 7 when starting discharge.

Referring to FIG. 6, a high voltage transformer 22 is connected between the coil 14 and the discharge lamp 15, and the secondary coil of the high voltage transformer 22 has diodes 23, 24. Force connected. The diode 23 superimposes only the positive voltage of the AC high voltage from the high-voltage transformer 22 on the voltage from the power supply 10 and applies it to the discharge lamp 15 as a high voltage for starting discharge. The current flowing through 15 is set to 6 [A]. The diode 24 is a diode for preventing high-voltage backflow to the high-voltage transformer 22.

When the discharge current flows through resistor 16, + Voltage is generated at the terminal. The resistors 26 and 27 are voltage-dividing resistors for setting a reference voltage based on the voltage of the power supply 19, and apply the set reference voltage to the-terminal of the operational amplifier 25.

The operational amplifier 25 compares the voltage supplied to the above (10) and (−) terminals, and outputs the output voltage that changes according to the comparison result to the PWM

28 is applied.

The PWM 28 increases or decreases the pulse width of the pulse according to the output voltage when the output voltage from the operational amplifier 25 is applied, and applies the voltage of the increased or decreased pulse width to the primary side of the high-voltage transformer 22 . That is, when the discharge current flows through the resistor 16, the operational amplifier 25 detects the discharge. P WM

28 stops the output of high voltage according to the detection result (change of output voltage) output from the output terminal of the operational amplifier 25. Then, an output voltage according to the reference voltage from the voltage dividing resistors 17 and 18 and the discharge voltage is output from the operational amplifier 20,

Discharge lamp 1 with current set by pulse width control of PWM 2

5 can continue the discharge.

Therefore, in this embodiment, when starting the discharge lamp, a high voltage can be superimposed on the discharge maintaining voltage and applied to the discharge lamp, so that even when the potential difference between the discharge maintaining voltage and the starting voltage is large, The discharge lamp can be started and stable discharge can be performed. For this reason, if the starting lighting device of this embodiment is used as an electronic ballast, the power supply voltage of the commercial power supply fluctuates. In addition, the electronic ballast applies a discharge starting voltage higher than the lighting sustain voltage to the discharge lamp at start-up by controlling the pulse width of the PWM 21 and 28, and by controlling the pulse width of the PWM 21 after the discharge starts. However, a constant discharge sustaining voltage can be applied to the discharge lamp.

The high-voltage starting voltage required at startup is generated by superimposing the high voltage generated by the high-voltage transformer 22 on the voltage from the power supply 10, and the voltage from the power supply 10 is Is small, and gradually increases to allow steady state. As a result, in this embodiment, the capacity of the transformer 11 can be reduced, and more discharge lamps can be connected to one transformer than in the prior art, so that the economic efficiency can be improved.

In this embodiment, the output of the high voltage is stopped by detecting the discharge. However, the present invention is not limited to this, and the output of the high voltage can be stopped by other means. The means is, for example, to connect a timer 29 to the PWM 28, detect a certain time after the power supply 10 is turned on, and output the detection signal to the PWM 28. Then, when the above detection signal is input, the PWM 28 becomes high after the predetermined time even if the discharge of the discharge lamp 15 is not detected by the operational amplifier 25. This stops the output of the voltage. This makes it possible to reduce the size of the pressurizing means for pressurizing the high voltage. If the operational amplifier 25 cannot detect the discharge of the discharge lamp 15 due to, for example, a defect in the discharge lamp, the PWM 28 applies a high voltage to the high-voltage transformer 22 for a long time, causing noise from the discharge lamp 15. Occurs. Therefore, as in this embodiment, if the output of the high voltage by the PWM 28 is stopped after a certain time counted by the timer 29, the generation of noise can be prevented.

FIG. 8 is a circuit diagram showing another embodiment in which the starting lighting device of FIG. 7 is improved. Referring to FIG. 8, the high-voltage transformer 36 has the functions of the choke coil 14 and the high-voltage transformer 22 shown in FIG. That is, the high-voltage transformer 36 generates a high voltage at the time of startup, and performs the function of the high-voltage transformer 22 that generates a high-voltage startup voltage by superimposing the high voltage on the voltage from the power supply 10. At the start of discharge, the operational amplifier 25 detects discharge, and the PWM 28 stops high-voltage output according to the detection result of the operational amplifier 25, so that the secondary coil of the high-voltage transformer 36 has a choke coil 1 Performs the function of 4 to bring the voltage from the power supply 10 into a steady state where discharge can be maintained. -Further, in this embodiment, the timer 29 is connected to the PWM 21 together with the PWM 28, and the timer 29 detects a certain time after the power supply 10 is turned on, and detects the time. It is configured to output the detection signals of the above to the PWM 21 and 28. When the detection signal is input, the PWM 21 stops the output of the voltage after the above-mentioned fixed time even if the operational amplifier 25 does not detect the discharge of the discharge lamp 15. Further, the PWM 28 stops the output of the voltage after the predetermined time only when the detection signal is input and the operational amplifier 25 does not detect the discharge of the discharge lamp 15. As a result, even if the discharge lamp is defective and the operational amplifier 25 cannot detect the discharge of the discharge lamp 15, a voltage is applied to the PWM 21 and 28 power transistors 13 and the high-voltage transformer 22 for a long time. Pressure, and noise generated from the discharge lamp 15 can be prevented.

Therefore, in this embodiment, no choke coil or diode is required, so that the number of circuit components can be reduced, and the manufacturing cost can be reduced. In addition, when the discharge lamp is defective, there is no need to pressurize the voltage to the transistors 13 and the high-voltage transformer 22 so that the current consumption is reduced and energy is saved. It is possible to aim for.

FIG. 9 is a circuit diagram showing still another embodiment of the start-up lighting device for a discharge lamp according to the present invention, in which a start-up lighting device for a rapid start in which the current at the time of startup is increased to a rated current at a high speed. Is the case. In FIG. 9, the same components as those in FIG. 1 described above have the same reference numerals, and are omitted for convenience of explanation.

Referring to FIG. 9, the resistor 16 is similar to FIG. A resistor for detecting a discharge current through which a discharge current generated by the discharge of the discharge lamp 15 flows. When the discharge current flows through the resistor 16, a voltage is generated at the + terminal of the operational amplifier 20. The resistors 31, 32, and 33 are used to set the current flowing through the discharge lamp 15 at the time of discharge of the discharge lamp 15 to a steady discharge current (in the embodiment,

2.3 [A]) A voltage dividing resistor for setting a reference voltage for setting the reference voltage based on the voltage from the power supply 19 is applied to the-terminal of the operational amplifier 20. The contact 32 of the relay circuit 35 is connected to the resistor 32 in parallel. The contact 34 is normally in the ON state, and is turned to the ON state by the excitation of the relay circuit 35. The operational amplifier 20 compares the voltages supplied to the terminals (10) and (−), and applies an output voltage that changes according to the comparison result to a pulse width control circuit (hereinafter referred to as “PWM”) 21.

When the output voltage from the operational amplifier 20 is applied, the PWM 21 increases or decreases the pulse width of the output pulse according to the output voltage, and the voltage of the increased or decreased pulse width is applied to the transistor.

In addition to 13 bases. The voltage generated by the discharge current flowing through the resistor 16 is also applied to the + terminal of the operational amplifier 30. Resistors 36 and 37 are discharge lamps

This is a voltage dividing resistor for setting a reference voltage for making the current flowing through the discharge lamp 15 at the time of the discharge 15 a steady discharge current (2.3 [A] in the embodiment). The above voltage divider resistor 36, The reference numeral 37 applies a reference voltage set based on the voltage from the power supply 19 to one terminal of the operational amplifier 30.

The operational amplifier 30 compares the voltages supplied to the + and one terminals, and applies an output voltage that changes according to the comparison result to the relay circuit 35.

When an output voltage from the operational amplifier 30 is applied when a voltage equal to or higher than the reference voltage is supplied to the + terminal, the relay circuit 35 is excited to turn off the contact 34.

Therefore, the reference voltage supplied to one terminal of the operational amplifier 20 is set to a high voltage at the time of startup in order to make the current flowing through the discharge lamp 15 a steady discharge current (2.3 [A] in the embodiment). When the current is set and reaches a steady discharge current, the reference voltage is set to a voltage lower than the voltage at the time of startup in order to maintain the steady discharge current.

When the output voltage from the operational amplifier 20 is applied, the PWM 21 increases or decreases the pulse width in accordance with the output voltage, and applies a voltage having the increased or decreased pulse width to the coil 14. That is, before the discharge current flows through resistor 16, the operational amplifier

20 is set to a high reference voltage. The PWM 21 outputs a high voltage according to the detection result output from the output terminal of the operational amplifier 20, and discharges the discharge lamp 15 in a short time. Then, the discharge current flows through resistor 16 and the operational amplifier

When 30 detects the discharge, the relay circuit 35 responds to the detection result output from the output terminal of the operational amplifier 30. Energize and turn off contacts 34. As a result, the operational amplifier 20 is set to a reference voltage lower than the voltage at the time of startup, and the PWM 21 maintains discharge by pulse width control according to the detection result output from the output terminal of the operational amplifier 20. Output the required voltage. By the PWM 21 pulse width control, the discharge lamp 15 discharges in a shorter time of about 2 minutes than the start-up lighting device in Fig. 1, and after the discharge, the discharge can be continued by the discharge maintenance voltage. it can.

It is also possible to configure the starting lighting device according to the present invention with a bridge circuit or the like and alternately apply the voltage to be applied to the discharge lamp by the above-described bridge circuit, that is, to convert the starting lighting device into an inverter. . FIG. 10 is a block diagram showing an embodiment in which the start-up lighting device is integrated into an inverter.

Referring to FIG. 10, the start-up lighting device includes a commercial AC power supply 41, a rectifier 42, a first inverter circuit 45, and a second inverter-type inverter circuit 4 for converting DC to AC. 6 and a high-pressure discharge lamp 47 as a load. A constant current regulator 43 and a constant voltage regulator 44 are connected to the first inverter circuit 45, and the second inverter circuit is controlled by a DC current value and a voltage value preset by the regulator. 46 is driven by AC and the high-pressure discharge lamp 47 is turned on. The voltage applied to the discharge lamp 47 is suppressed by the inductance characteristics of the first inverter circuit 45, whereby the discharge lamp 47 is gradually turned on. The load used in the present invention is a discharge lamp. As described above, when the start-up lighting device is configured by an inverter circuit, the discharge lamp emits electromagnetic waves into the air by acting as an antenna. If a large amount of this electromagnetic wave is radiated, the electromagnetic wave may adversely affect the operation of other devices and FA devices as noise. Therefore, as shown in (a) and (b) of FIGS. 11 and 12, all or part of the outer surface of the discharge lamps 50 and 51 is provided with a transparent conductive material that does not hinder the passage of light. The coating layers 52, 53 of the membrane or the conductive nets 56, 57 are provided, and the grounding wires 54, 5 are provided on the coating layers 52, 53, the conductive nets 56, 57. It is also possible to connect 5, 58, 59. As a result, it is possible to shield the electromagnetic waves and prevent the electromagnetic waves from being emitted outside, so that noise can be shielded well. The above-mentioned coating layer is formed by depositing or plating an extremely thin (0.5 or less) conductive material such as a metal. Further, a conductive paint may be applied.

The discharge lamps 50 and 51 are usually housed in metal lighting fixtures 60 and 61 as shown in FIGS. 13 (a) and (b). Therefore, transparent lids 62, 63 coated with a conductive net or a transparent conductive film are attached so as to cover the openings of the lighting equipment 60, 61, and the lighting equipment is further grounded. Connect the conductors 64, 65, and ground the lighting equipment, net, and lid at the same potential, and perform electromagnetic isolation. It is also possible to shield noise well

Claims

The scope of the claims

1. In a discharge lamp starting and lighting device that starts and lights a discharge lamp based on a rectified voltage supplied from a power supply,

A discharge unit that sets the rectified voltage to a high voltage to start discharging the discharge lamp and discharges the discharge lamp; and lighting that discharges the discharge lamp by reducing the voltage after the discharge lamp discharges. Means

A start-up lighting device for a discharge lamp, comprising:

2. The discharge means includes a voltage supply circuit that generates a supply voltage by increasing and decreasing the rectified voltage and supplies the supply voltage to the discharge lamp;

A superimposing circuit for superimposing a predetermined pulsating voltage based on an inductance characteristic on a supply voltage from the voltage supply circuit;

With

The lighting means includes: a discharge detection circuit that detects a start of discharge of the discharge lamp in response to supply of a supply voltage;

When the discharge detection circuit detects the start of discharge, a supply control circuit that controls the voltage supply circuit and reduces the supply voltage;

A discharge maintaining circuit for maintaining the discharge in a steady state after detecting the start of the discharge;

The starting and lighting device for a discharge lamp according to claim 1, further comprising:

3. The discharge means comprises: a first voltage supply circuit that generates a supply voltage by increasing and decreasing the rectified voltage and supplies the supply voltage to the discharge lamp;

A superimposing circuit for superimposing a predetermined pulsating voltage based on the inductance characteristic on the supply voltage from the first voltage supply circuit; and generating a high voltage and superimposing the high voltage on the supply voltage from the first voltage supply circuit. A second voltage supply circuit for supplying the discharge lamp;

With

A discharge detection circuit that detects a start of discharge of the discharge lamp according to the supply of the supply voltage;

A first supply control circuit that controls the first voltage supply circuit to reduce the supply voltage when the discharge detection circuit detects the start of discharge;

A second supply control circuit that controls the second voltage supply circuit to stop the generation of the high voltage when the discharge detection circuit detects the start of discharge;

4. After a predetermined time from the generation of the power supply voltage, the lighting unit controls the second voltage supply circuit to stop the generation of the high voltage, prior to the control of the second supply control circuit. Third supply control circuit

4. The starting lighting device for a discharge lamp according to claim 3, wherein the lighting device includes:

5. The second supply control circuit includes: a high-voltage transformer that generates an AC high voltage; and a superimposed voltage of the generated AC high voltage that is superimposed on a supply voltage from the first voltage supply circuit. 5. The starting and lighting device for a discharge lamp according to claim 3, further comprising: a first diode; and a second diode that suppresses a backflow of a high voltage to the high-voltage transformer.

6. a first voltage supply circuit that generates and supplies a supply voltage by pressurizing and reducing the rectified voltage, and supplying the supply voltage to the discharge lamp;

A predetermined pulsating voltage based on the inductance characteristic is superimposed on the supply voltage from the first voltage supply circuit, and a high voltage is generated, and the voltage is superimposed on the supply voltage from the first voltage supply circuit. A second voltage supply circuit for supplying a discharge lamp,

When the discharge detection circuit detects the start of discharge, the first supply control circuit controls the first voltage supply circuit to reduce the supply voltage, and

When the discharge detection circuit detects the start of discharge, the second voltage supply circuit is controlled to stop the generation of a high voltage. A second supply control circuit;

When the discharge detection circuit does not detect the start of discharge even after a lapse of a predetermined time from the generation of the power supply voltage, the first and second supply control circuits take precedence over the control of the first and second supply control circuits. A third supply control circuit for controlling the voltage supply circuit to stop generation of each of the voltages;

7. The starting and lighting device for a discharge lamp according to claim 6, wherein the second voltage supply circuit includes a high-voltage transformer including a secondary coil having the inductance characteristic.

8. A discharge lamp that starts up and lights up based on the rectified voltage supplied from the power supply and shuts off emitted electromagnetic waves;

A discharge unit that sets the rectified voltage to a high voltage to start discharging the discharge lamp and discharges the discharge lamp; and a lighting unit that discharges the discharge lamp after the discharge lamp discharges to reduce the voltage. Means

A start-up lighting device for a discharge lamp, comprising:

9. The discharge lamp has a coating layer of a transparent conductive film on at least a part of an outer surface thereof, and a grounding wire is connected to the coating layer. Record Start-up lighting device for the on-board discharge lamp.

10. The start-up of the discharge lamp according to claim 8, wherein the discharge lamp has a conductive net on at least a part of an outer surface thereof, and a grounding wire is connected to the net. Lighting device.