JPH08106990A - Discharge lamp lighting device and lighting system - Google Patents

Abstract

PURPOSE: To prevent starting voltage from being generated before a safety circuit is reset. CONSTITUTION: A safety circuit 32 is reset when an NPN transistor 28 is turned off, and detects voltage applied to a discharge lamp 31 after the second time passes after starting voltage is supplied from a starting circuit 26 in a reset condition, and switches an electric power supply switch SW11 to an OFF condition when this detected result exceeds a preset value. The time until the NPN transistor 28 is put in an OFF condition after DC electric power supply voltage of a reset circuit 27 is applied, is set sufficiently shorter than the time until the starting voltage is generated after DC electric power supply voltage of the starting circuit 26 is applied. Therefore, the starting voltage can be prevented from being generated before the safety circuit is reset.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device and a lighting device provided with a safety circuit for detecting the end of life of a discharge lamp, and more particularly to a discharge lamp lighting device and a lighting device capable of preventing malfunction of the safety circuit. .

[0002]

2. Description of the Related Art Conventionally, as a discharge lamp, a metal halide lamp, a mercury lamp, a high pressure sodium lamp and the like have been commercialized. Some of the discharge lamp lighting devices for lighting these discharge lamps are provided with a safety circuit for detecting the end of life of the discharge lamp.

FIG. 6 is a circuit diagram showing a conventional discharge lamp lighting device provided with such a safety circuit.

In FIG. 6, one output terminal of the commercial AC power supply 71 is connected to one input terminal of a full-wave bridge rectifier circuit 72 via a power switch SW71, and the other output terminal of the commercial AC power supply 71 is It is connected to the other input terminal of the full-wave bridge rectifier circuit 72 via a power switch SW71.

The positive output terminal of the full-wave bridge rectifier circuit 72 is connected to one electrode of the smoothing capacitor C71 and also to the positive input terminal of the inverter 80. The negative output terminal of the full-wave bridge rectifier circuit 72 is connected to the other electrode of the smoothing capacitor C71 and also to the negative input terminal of the inverter 80.

The inverter 80 is an NPN transistor 8
1, 82, oscillators 83 and 84 for controlling the NPN transistors 81 and 82 at high frequencies, a stabilizing coil L81, a DC cut capacitor C81, a starting voltage generating circuit 85, and a resistor R81 that serves as a starting circuit. It is configured.

More specifically, the inverter 80
The input terminal on the positive side of the inverter 80 via the collector-emitter path of the NPN transistor 81 and the collector-emitter path of the NPN transistor 82 connected in series.
Is connected to the negative input terminal of the
Is connected to the power input terminal on the positive side of the
Via 81, it is connected to the base of the NPN transistor 82, the starting voltage input terminal of the starting voltage generating circuit 85, and the starting voltage input terminal of the safety circuit 92. NPN transistor 8
The connection point of 1, 82 is connected to the base of the NPN transistor 81 via the oscillator 83, and the stabilization coil L
81 is connected to the first output terminal of the inverter 80 via a series connection of 81 and a DC cut capacitor C81.
The input terminal on the negative side of the inverter 80 is connected to the base of the NPN transistor 81 via the oscillator 83, is connected to the power input terminal on the negative side of the starting voltage generating circuit 85, and is connected to the second input terminal of the inverter 80 of the inverter 80. Connected to the output terminal of.

The oscillators 83 and 84 are adapted to alternately turn on and off the NPN transistors 81 and 82 by the oscillation of the stabilizing coil L21.

One input terminal of the discharge lamp 91 is connected to the first output terminal of the inverter 80. Discharge lamp 91
The other input terminal of is connected to the second output terminal of the inverter 80. A capacitor C91 and a safety circuit 92 are connected between both terminals of the discharge lamp 91.

In such a discharge lamp lighting device, when the discharge lamp 91 is in a normal state, the discharge lamp lighting device is completely turned off, and all the circuits are reset, the power switch SW71 is turned on. The AC power supply voltage from the commercial AC power supply 71 is rectified by the full-wave bridge rectifier circuit 72 and the smoothing capacitor C71, and the inverter 80
Given to. This causes a current to flow in the resistor R81,
Base of NPN transistor 82, starting voltage generation circuit 8
5. A starting voltage is applied to the safety circuit 92, a preheating voltage is applied to the filament for 1 second by a preheating circuit (not shown) in the discharge lamp 91, and then the starting voltage generating circuit 85 operates to turn on the oscillation circuits 83 and 84. The discharge lamp 91 is oscillated at a relatively high frequency, a starting voltage of about 410 V is applied to the discharge lamp 91 for 0.5 seconds, and the discharge lamp 92 is lit. After that, the voltage applied to the discharge lamp 91 becomes about 200 V, which is lower than the starting voltage. In this state, the safety circuit 92 operates to detect the voltage applied to the discharge lamp 91. In this case, since the voltage applied to the discharge lamp 91 is 200 V, the safety circuit 92
Keeps lighting the discharge lamp 91.

When the discharge lamp 91 is at the end of its life and the power switch SW71 is turned on from the state in which the discharge lamp lighting device is completely turned off, the discharge lamp 91 is supplied with a starting voltage and then the discharge lamp is turned on. The voltage applied to 91 is considerably higher than 200V. As a result, the voltage applied to the discharge lamp 91 considerably exceeds 200V, so the safety circuit 92 forcibly turns off the power switch SW1.

Here, one second before the safety circuit 92 is reset, the power switch SW71 is turned on while the discharge lamp 91 is in a normal state, and the power switch SW71 is turned off from the state where the discharge lamp 91 is continuously lit. When the power switch SW71 is turned on (time before the start voltage is generated after the power switch SW71 is turned on), the starting voltage is applied to the safety circuit 92, and the safety circuit 92 indicates that the discharge lamp 91 has reached the end of its life. And the power switch SW71 is turned off and the discharge lamp lighting device is turned off.

In response to this, if the time for resetting the safety circuit 92 is shortened, a malfunction occurs in which the safety circuit 92 is reset due to power source noise or the like.

[0014]

In the above-mentioned conventional discharge lamp lighting device, the power switch is turned off from the state where the discharge lamp is continuously lit, and the starting voltage is generated before the safety circuit is reset. When the power switch is turned on, the safety circuit malfunctions due to the starting voltage.

Therefore, an object of the present invention is to provide a discharge lamp lighting device and a lighting device capable of preventing a starting voltage from being generated before the safety circuit is reset.

[0016]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device including a direct current voltage generating means for generating a direct current voltage, a switch for turning on / off the direct current voltage generation of the direct current voltage generating means, and A starting circuit that outputs a starting voltage when a first time has elapsed after the DC voltage is supplied from the DC voltage generating means, and the starting circuit is started by supplying the starting voltage from the starting circuit. An inverter that creates and outputs a high-frequency voltage from a DC voltage from the discharge lamp, a discharge lamp to which the high-frequency voltage is supplied from the inverter, and a starting voltage supplied from the starting circuit to start the discharge lamp in the inverter. And a starting voltage generating circuit for ending the generation of the starting voltage when the second time has elapsed after the starting voltage was supplied from the starting circuit. In the reset state, a starting voltage is supplied from the starting circuit, the voltage applied to the discharge lamp is detected after the second time has elapsed, and the DC voltage is generated when the detection result exceeds a predetermined value. A safety circuit for switching the means to an off state, and a reset for resetting the safety circuit when a third time shorter than the first time elapses after the direct current voltage is not supplied from the direct current voltage generating means. And a circuit.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, wherein a direct current voltage generating means for generating a direct current voltage, a switch for turning on / off the direct current voltage generation of the direct current voltage generating means, and a direct current from the direct current voltage generating means. A start-up circuit that outputs a start-up voltage when a first time has elapsed since the voltage was supplied;
An inverter that is started by supplying a starting voltage from the starting circuit, creates an high-frequency voltage from the DC voltage from the DC voltage generating means, and outputs the high-frequency voltage; and a discharge lamp to which the high-frequency voltage is supplied from the inverter, A starting voltage for starting the discharge lamp is generated in the inverter by supplying the starting voltage from the starting circuit, and the generation of the starting voltage has occurred a second time after the starting voltage was supplied from the starting circuit. And a voltage applied to the discharge lamp after the second time elapses when the starting voltage is supplied from the starting circuit in a reset state and the detection result is a predetermined value. A safety circuit that lowers the high frequency voltage output from the inverter when the voltage exceeds the Wherein said it has and a reset circuit for resetting the safety circuit when al the third time shorter than the first time has elapsed.

According to another aspect of the present invention, there is provided a discharge lamp lighting device including a direct current voltage generating means for generating a direct current voltage, a switch for turning on / off the direct current voltage generation of the direct current voltage generating means, and a direct current from the direct current voltage generating means. By supplying the voltage, the starting voltage is increased based on a predetermined time constant to be output from the first output terminal, and when the first time has elapsed from the DC voltage being supplied, the starting voltage is output from the second output terminal. A starting circuit that outputs the starting voltage and an inverter that is started by supplying the starting voltage from a second output terminal of the starting circuit, and that creates and outputs a high-frequency voltage from the DC voltage from the DC voltage generating means. A discharge lamp to which a high-frequency voltage is supplied from this inverter, and a discharge lamp to the inverter by starting voltage being supplied from the second output terminal of the starting circuit. To generate a starting voltage for causing,
A starting voltage generating circuit that terminates the generation of the starting voltage when a second time has elapsed after the starting voltage is supplied from the starting circuit, and a starting voltage is supplied from the starting circuit in a reset state, and the second The safety circuit for detecting the voltage applied to the discharge lamp after the lapse of time, and switching the DC voltage generating means to the off state when the detection result exceeds a predetermined value, and the first output of the starting circuit. And a reset circuit for resetting the safety circuit when a starting voltage is supplied from the terminal.

According to another aspect of the present invention, there is provided a discharge lamp lighting device, wherein a DC voltage generating means for generating a DC voltage, a switch for turning on / off the generation of the DC voltage of the DC voltage generating means, and a DC voltage from the DC voltage generating means. By supplying the voltage, the starting voltage is increased based on a predetermined time constant to be output from the first output terminal, and when the first time has elapsed from the DC voltage being supplied, the starting voltage is output from the second output terminal. A starting circuit that outputs the starting voltage and an inverter that is started by supplying the starting voltage from a second output terminal of the starting circuit, and that creates and outputs a high-frequency voltage from the DC voltage from the DC voltage generating means. A discharge lamp to which a high-frequency voltage is supplied from this inverter, and a discharge lamp to the inverter by starting voltage being supplied from the second output terminal of the starting circuit. To generate a starting voltage for causing,
A starting voltage generating circuit that terminates the generation of the starting voltage when a second time has elapsed after the starting voltage is supplied from the starting circuit, and a starting voltage is supplied from the starting circuit in a reset state, and the second The safety circuit that detects the voltage applied to the discharge lamp after the lapse of time, and lowers the high frequency voltage output by the inverter when the detection result exceeds a predetermined value, and the first output of the starting circuit. And a reset circuit for resetting the safety circuit when a starting voltage is supplied from the terminal.

[0020]

According to the structure of the present invention, the third time shorter than the first time during which the starting circuit outputs the starting voltage has elapsed since the DC voltage was not supplied from the DC voltage generating means. Since the reset circuit sometimes resets the safety circuit, it is possible to prevent the starting voltage from being generated before the safety circuit is reset.

According to the second aspect of the invention, the third time shorter than the first time period in which the starting circuit outputs the starting voltage after the DC voltage is not supplied from the DC voltage generating means.
Since the reset circuit resets the safety circuit when the time elapses, the generation of the starting voltage before the safety circuit is reset can be prevented.

According to the third aspect of the present invention, the start-up circuit increases the start-up voltage based on a predetermined time constant when the direct-current voltage is supplied from the direct-current voltage generating means, and outputs it from the first output terminal. At the same time, when the first time has elapsed since the DC voltage was supplied, the starting voltage is output from the second output terminal, and the starting voltage generating circuit supplies the starting voltage from the second output terminal of the starting circuit. Before the safety circuit is reset because the reset circuit resets the safety circuit by generating a startup voltage in the inverter and supplying the startup voltage from the first output terminal of the startup circuit. It is possible to prevent the starting voltage from being generated.

According to the fourth aspect of the invention, the starting circuit increases the starting voltage based on a predetermined time constant by supplying the DC voltage from the DC voltage generating means and outputs the voltage from the first output terminal. At the same time, when the first time has elapsed since the DC voltage was supplied, the starting voltage is output from the second output terminal, and the starting voltage generating circuit supplies the starting voltage from the second output terminal of the starting circuit. Before the safety circuit is reset because the reset circuit resets the safety circuit by generating a startup voltage in the inverter and supplying the startup voltage from the first output terminal of the startup circuit. It is possible to prevent the starting voltage from being generated.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

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

One output terminal of the commercial AC power supply 11 is connected to the full-wave bridge rectifier circuit 12 via the power switch SW11.
One of the input terminals is connected to the other input terminal of the commercial AC power supply 11, and the other output terminal of the commercial AC power supply 11 is connected to the other input terminal of the full-wave bridge rectifier circuit 12 via the power switch SW11.

The positive output terminal of the full-wave bridge rectifier circuit 12 is connected to one electrode of the smoothing capacitor C11 and also to the positive input terminal of the inverter 20. The negative output terminal of the full-wave bridge rectifier circuit 12 is connected to the other electrode of the smoothing capacitor C11 and also to the negative input terminal of the inverter 20. With such a connection, the commercial AC power supply 11, the rectifier circuit 12, and the smoothing capacitor C11 constitute a DC voltage generating means for generating a DC voltage.

The AC power supply voltage from the commercial AC power supply 11 is
When the power switch SW11 is turned on, it is rectified by the full-wave bridge rectifier circuit 12 and the smoothing capacitor C11 and is given to the inverter 20 as a DC voltage.

The inverter 20 is an NPN transistor 2
1, 22 and oscillators 23 and 24 for controlling the NPN transistors 21 and 22 at high frequencies, a stabilizing coil L21, a DC cutting capacitor C21, a starting voltage generating circuit 25, a starting circuit 26, and a reset circuit 27.
It consists of and.

The starting circuit 26 is composed of resistors R21 and R22, a capacitor C22 and a bidirectional diode D11.

The reset circuit 27 includes resistors R23 and R2.
4, R25, electrolytic capacitor C24 and NPN transistor 28.

In more detail, the inverter 20
The input terminal on the positive side of the inverter 20 is connected in series with the collector-emitter path of the NPN transistor 21 and the collector-emitter path of the NPN transistor 22.
Connected to the negative input terminal of the starting voltage generating circuit 25
Is connected to the power input terminal on the positive electrode side of the resistor R21, the capacitor C22 and the resistor R22 of the starting circuit 26.
Is connected to the input terminal on the negative electrode side of the inverter 20 through the series connection of. The connection point between the resistor R21 and the capacitor C22 is connected to the base of the NPN transistor 22, the starting voltage generating circuit 25, and the safety circuit 3 via the bidirectional diode D11.
2 start-up voltage input terminals and.

The positive input terminal of the inverter 20 has a resistor R23 of the reset circuit 27 and an electrolytic capacitor C.
It is connected to the input terminal on the negative electrode side of the inverter 20 through the series connection of 24. Resistor R23 and electrolytic capacitor C24
The connection point of is connected to the input terminal on the negative electrode side of the inverter 20 via the series connection of the resistors R24 and R25. Resistance R
The connection point of 24 and R25 is connected to the base of the NPN transistor 28. The emitter of the NPN transistor 28 is connected to the positive power source input terminal of the starting voltage generating circuit 25. The collector of the NPN transistor 28 is connected to the reset terminal of the starting voltage generating circuit 25 and the reset terminal of the safety circuit 32. The starting voltage generating circuit 25 and the safety circuit 32 are reset by turning off the NPN transistor 28.

The connection point of the NPN transistors 21 and 22 is connected to the base of the NPN transistor 21 via the oscillator 23, and the inverter 2 is connected via the series connection of the stabilizing coil L21 and the DC cutting capacitor C21.
0 to the first output terminal. The negative input terminal of the inverter 20 is connected to the base of the NPN transistor 21 via the oscillator 23, is connected to the negative power input terminal of the starting voltage generation circuit 25, and is connected to the second input terminal of the inverter 20 of the inverter 20. Connected to the output terminal of.

The oscillators 23 and 24 are adapted to alternately turn on and off the NPN transistors 21 and 22 by the oscillation of the stabilizing coil L21.

Discharge lamp (fluorescent lamp in this embodiment) 3
One input terminal of 1 is connected to the first output terminal of the inverter 20. The other input terminal of the discharge lamp 31 is
It is connected to the second output terminal of the inverter 20. A capacitor C31 and a safety circuit 32 are connected between both terminals of the discharge lamp 31.

The oscillating frequencies of the oscillators 23 and 24 and the stabilizing coil L21 are controlled by the starting voltage generating circuit 25. When the starting voltage is generated, the oscillating frequency oscillates at a frequency higher than that during normal lighting and the discharge lamp 31. The starting voltage is applied to.

The resistors R21 and R22 and the capacitor C22 of the starting circuit 26 constitute a charging time constant circuit, and the resistors R23 and R24 of the reset circuit 27 and the electrolytic capacitor C24.
Constitutes a discharge time constant circuit.

Here, the resistors R21 and R2 of the starting circuit 26 are
Assuming that the resistance value in the serial state of 2 is R6, the capacitance of the capacitor C22 is C6, the resistance value of the resistors R24 and R25 of the reset circuit 27 in the serial state is R7, and the capacitance of the electrolytic capacitor C24 is C7, the following formula is obtained. I am trying to hold it.

C6 × R6 >> C7 × R7 (1) In this equation, the charging time constant of the starting circuit 26 is the reset circuit 2
7 is sufficiently larger than the discharge time constant of No. 7, and the time from when the DC power supply voltage of the reset circuit 27 is applied until the NPN transistor 28 is turned off depends on the DC power supply voltage of the starting circuit 26. It is shown that the time is set to be sufficiently shorter than the time from the generation of the starting voltage to.

As a result, the starting circuit 26 outputs the starting voltage when the first time has elapsed since the DC voltage was supplied from the DC voltage generating means.

The resistance R24 of the reset circuit 27 is the resistance value of the resistances R21 and R22 of the starting circuit 26 in the serial state, which is R.
It is set to a value sufficiently larger than 6.

The starting voltage generating circuit 25 generates a starting voltage for starting the discharge lamp 31 in the inverter 22 when the starting voltage is supplied from the starting circuit 26, and the starting circuit 21 generates the starting voltage. It is terminated when the second time has elapsed since the startup voltage was supplied.

The safety circuit 32 detects the voltage applied to the discharge lamp 31 after the starting voltage is supplied from the starting circuit 26 in the reset state and the second time has elapsed, and the detection result shows a predetermined value. Power switch SW1 if exceeded
Switch 1 to the off state.

FIG. 2 is a timing chart showing the operation of such an embodiment. FIG. 2 (a) shows the starting voltage VT1 of the starting circuit 26, and FIG. 2 (b) shows the resistors R23 and R24.
The voltage VB1 at the connection point of the inverter 2 is shown in FIG.
0 indicates the output voltage applied to the discharge lamp 31.

In such a discharge lamp lighting device, when the discharge lamp 31 is in a normal state, the discharge lamp lighting device is completely turned off, and all the circuits are reset, the power switch SW11 is turned on. , The starting voltage VT1 of the starting circuit 26 shown in FIG. 2A is the charging time constant C of the starting circuit 26.
2B because the current from the DC voltage generating means flows to the starting circuit 26 until the time T11 (the first time) elapses after the power switch SW11 is turned on based on 6 × R6. The voltage VB1 at the connection point of the resistors R23 and R24 shown is almost 0V. Further, since the starting voltage VT1 is blocked by the bidirectional diode D11,
The output voltage of the inverter 20 in (c) is in the 0V state. When the time T11 has elapsed, the starting voltage VT1 shown in FIG. 2A exceeds the Zener voltage of the bidirectional diode D11 and is applied to the base of the NPN transistor 22, the starting voltage generating circuit 25, and the safety circuit 32. As a result, the starting voltage generation circuit 25 operates to cause the oscillation circuits 23 and 24 to oscillate at a relatively high frequency, and the inverter 20 operates as shown in FIG.
As shown in (C), 0.5 seconds (second time), 410
The discharge lamp 32 is turned on by applying a starting voltage of about V to the discharge lamp 32. On the other hand, at the same time when the starting voltage rises, the starting voltage VT1 shown in FIG. 2 (a) becomes 0V, and the voltage VB1 at the connection point of the resistors R23 and R24 gradually increases. As shown in FIG. 2 (C), the inverter 20 has 0.
Immediately after the starting voltage of about 410V is applied to the discharge lamp 32 for 5 seconds, the voltage applied to the discharge lamp 31 is lower than the starting voltage.
The voltage is about 0V. Further, the safety circuit 32 changes the voltage of the discharge lamp 31 after 0.5 seconds (0.5 seconds in this embodiment) after the start-up voltage VT1 is applied. Detect. The detection result of the safety circuit 32 in this case indicates that the discharge lamp 31 is in a normal state, so that the power switch SW11 is kept on.

After that, when the power switch SW11 is turned off, the voltage VB1 at the connection point of the resistors R23 and R24 shown in FIG. 2 (b) becomes the discharge time constant C7 × R of the reset circuit 26.
7 and the output voltage applied to the discharge lamp 31 by the inverter 20 drops sharply to 0V as shown in FIG. 2 (c). Here, when the power switch SW11 is turned on immediately after the power switch SW11 is turned off, the starting voltage VT1 of the starting circuit 26 shown in FIG. 2A is based on the charging time constant C6 × R6 of the starting circuit 26. Although it rises, the starting voltage V shown in FIG.
Before T1 exceeds the Zener voltage of the bidirectional diode D11, the voltage VB1 at the connection point of the resistors R23 and R24 shown in FIG. 2 (b) becomes 0V, the NPN transistor 28 is turned off, and the starting voltage generating circuit 25 and the safety circuit are safe. The circuit 32 is reset. After this, when time T11 elapses after the power switch SW11 is turned on, the starting voltage V shown in FIG.
T1 exceeds the Zener voltage of the bidirectional diode D11, and the same operation as described above is performed.

When the power switch SW11 is turned on after the discharge lamp 31 has reached the end of its life and the discharge lamp lighting device has been completely turned off, after the time T11 and 0.5 seconds have elapsed, the discharge lamp 31 is released. The voltage applied to the electric lamp 91 is detected to be considerably higher than 200 V, and the power switch SW11 is forcibly turned off.

According to such an embodiment, the safety circuit 32
Since it is possible to prevent the starting voltage from being generated before is reset, even if the power switch SW11 is turned on immediately after the power switch SW11 is turned off, the safety circuit does not malfunction and the discharge lamp can be turned on.

FIG. 3 is a circuit diagram showing another embodiment of the discharge lamp lighting device according to the present invention. The same components as those of the embodiment of FIG. 1 are designated by the same reference numerals and their description is omitted.

In FIG. 3, the connection point between the resistor R21 and the capacitor C22 of the starting circuit 126 of the inverter 120 is
It is connected to the base of the NPN transistor 29 through the resistor R26 of the reset circuit 127. The collector of the NPN transistor 29 is connected to the connection point of the resistors R24 and R25, and the emitter of the NPN transistor 28 is connected to the positive power source input terminal of the starting voltage generating circuit 25.

FIG. 4 is a timing chart showing the operation of such an embodiment, and FIG.
4B shows the starting voltage VT2 of the resistors R23 and R2.
4 shows the voltage VB2 at the connection point of FIG. 4, and FIG. 4 (C) shows the output voltage applied to the discharge lamp 31 by the inverter 120.

In such a discharge lamp lighting device, when the discharge lamp 31 is in a normal state, the discharge lamp lighting device is completely turned off, and all the circuits are reset, the power switch SW11 is turned on. The operation is similar to that shown in FIG. After that, when the power switch SW11 is turned off and then immediately after the power switch SW11 is turned off, the power switch SW11 shown in FIG.
The starting voltage VT2 of the starting circuit 126 shown in FIG.
Rises based on the charging time constant C6 × R6 and reaches a predetermined level A, the NPN transistor 29 is turned on, the voltage VB1 becomes 0V, and the NPN transistor is turned off.
The starting voltage generating circuit 25 and the safety circuit 32 are reset. After that, the voltage VB2 slightly rises due to the electric charge stored in the capacitor C24, and when the time T11 elapses after the power switch SW11 is turned on, the starting voltage VT2 shown in FIG. 4A is the Zener voltage of the bidirectional diode D11. Beyond, the base of the NPN transistor 22, the starting voltage generating circuit 25, and the safety circuit 32 are added, the starting voltage generating circuit 25 operates, and thereafter, the similar starting and lighting operations of the discharge lamp 31 are performed.

According to such an embodiment, since the starting voltage can be prevented from being generated before the safety circuit is reset, the safety circuit does not malfunction even when the power is turned on immediately after the power switch is turned off. Instead, the discharge lamp can be turned on.

FIG. 5 is a perspective view showing a lighting device to which any one of the discharge lamp lighting devices of the embodiments of FIGS. 1 and 3 is applied.

In FIG. 5, the lighting device 101 has the discharge lamps 105 and 106 attached to the sockets 402 and 403 of the lighting fixture main body 102, respectively, and the discharge lamp lighting device 1 is internally provided.
07 is accommodated, and the discharge lamp 10 is installed by the discharge lamp lighting device 107.
5,106 are turned on.

With such a structure, the embodiment of FIG. 1 can be applied to the lighting device.

In the embodiment shown in FIGS. 1 and 3, the resistor R2
2 and the capacitor C22 were connected in series, but by setting the time constant appropriately, the resistor R22 and the capacitor C22
May be connected in parallel. Further, in the embodiments of FIGS. 1 and 3, the bidirectional diode D11 is used as a means for blocking the starting voltage until it reaches a predetermined value, but other means, for example, a unidirectional Zener diode may be used. Although the commercial AC power supply 11 is used as the AC power supply in the embodiments of FIGS. 1 and 3, various AC power supplies such as private power generation may be used. Further, although the NPN transistor is used as the switching element in the embodiments of FIGS. 1 and 3, other switching elements may be used. Furthermore, in the embodiment of FIGS. 1 and 3, the safety circuit is configured to turn off the power switch when the end of life of the discharge lamp is detected, but the high frequency voltage output from the inverter is lowered. You may comprise. Also, FIG. 1 and FIG.
In the embodiment, the discharge lamp is the fluorescent lamp, but a discharge lamp other than the fluorescent lamp may be used.

[0059]

According to the present invention, since the starting voltage can be prevented from being generated before the safety circuit is reset, the safety circuit does not malfunction even when the power is turned on immediately after the power switch is turned off. Instead, the discharge lamp can be turned on.

[0060]

[Brief description of drawings]

[0061]

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

[0062]

FIG. 2 is a timing chart showing the operation of the embodiment of FIG.

[0063]

FIG. 3 is a circuit diagram showing another embodiment of the discharge lamp lighting device according to the present invention.

[0064]

FIG. 4 is a timing chart showing the operation of the embodiment of FIG.

[0065]

FIG. 5 is a perspective view showing an illumination device to which any one of the discharge lamp lighting devices of the embodiments of FIGS. 1 and 3 is applied.

[0066]

FIG. 6 is a circuit diagram showing a conventional discharge lamp lighting device.

[0067]

[Explanation of symbols]

 11 Commercial AC power supply 12 Full-wave bridge rectifier circuit 20 Inverter 21,22 NPN transistor 23,24 Oscillator 25 Starting voltage generating circuit 26 Starting circuit 27 Reset circuit 31 Discharge lamp 32 Safety circuit C11 Smoothing capacitor C21 Capacitor L21 Stabilizing coil

[Procedure amendment]

[Submission date] December 5, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction content]

In FIG. 5, a lighting apparatus 101 has discharge lamps 105 and 106 attached to sockets 103 and 104 of a lighting apparatus main body 102, respectively, and the discharge lamp lighting apparatus 1 is internally provided.
07 is accommodated and the discharge lamp 10 is driven by the discharge lamp lighting device 107.
5,106 are turned on.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 4]

[Figure 3]

[Figure 5]

[Figure 6]

Claims (6)

[Claims] 1. A direct-current voltage generating means for generating a direct-current voltage, a switch for turning on / off the direct-current voltage generation of the direct-current voltage generating means, and a first direct-current voltage after being supplied from the direct-current voltage generating means. A starting circuit that outputs a starting voltage when time has elapsed, and an inverter that is started by supplying the starting voltage from the starting circuit and that creates and outputs a high-frequency voltage from the DC voltage from the DC voltage generating means. A discharge lamp to which a high-frequency voltage is supplied from this inverter; and a starting voltage to start the discharge lamp from the starting circuit, which is generated by supplying the starting voltage from the starting circuit. A starting voltage generation circuit that is terminated when a second time has elapsed after the starting voltage is supplied from the circuit, and the starting circuit that is started in the reset state A safety circuit that detects the voltage applied to the discharge lamp after the second time has elapsed after the voltage is supplied and switches the DC voltage generating means to the off state when the detection result exceeds a predetermined value; A reset circuit for resetting the safety circuit when a third time shorter than the first time elapses after the DC voltage is not supplied from the DC voltage generating means. Electric lighting device. 2. A direct current voltage generating means for generating a direct current voltage, a switch for turning on / off the direct current voltage generation of the direct current voltage generating means, and a first direct current after the direct current voltage is supplied from the direct current voltage generating means. A starting circuit that outputs a starting voltage when time has elapsed, and an inverter that is started by supplying the starting voltage from the starting circuit and that creates and outputs a high-frequency voltage from the DC voltage from the DC voltage generating means. A discharge lamp to which a high-frequency voltage is supplied from this inverter; and a starting voltage to start the discharge lamp from the starting circuit, which is generated by supplying the starting voltage from the starting circuit. A starting voltage generation circuit that is terminated when a second time has elapsed after the starting voltage is supplied from the circuit, and the starting circuit that is started in the reset state A safety circuit that detects a voltage applied to the discharge lamp after the second time has been supplied and a voltage is supplied, and that lowers the high frequency voltage output by the inverter when the detection result exceeds a predetermined value; A reset circuit for resetting the safety circuit when a third time shorter than the first time elapses after the DC voltage is not supplied from the DC voltage generating means. Electric lighting device. 3. A DC voltage generating means for generating a DC voltage, a switch for turning on / off the generation of the DC voltage of the DC voltage generating means, and a starting voltage supplied with the DC voltage from the DC voltage generating means. And a starting circuit that outputs the starting voltage from the second output terminal when a first time has elapsed after the DC voltage was supplied, while increasing the output voltage from the first output terminal based on a predetermined time constant. An inverter, which is started by supplying a starting voltage from a second output terminal of the starting circuit, creates a high frequency voltage from the DC voltage from the DC voltage generating means and outputs the high frequency voltage, and the high frequency voltage is supplied from the inverter. And a starting voltage for starting the discharge lamp in the inverter by supplying a starting voltage from the second output terminal of the starting circuit. And a starting voltage generating circuit that terminates the generation of the starting voltage when a second time has elapsed after the starting voltage is supplied from the starting circuit, and a starting voltage is supplied from the starting circuit in a reset state. A safety circuit that detects a voltage applied to the discharge lamp after a second time has elapsed, and switches the DC voltage generating means to an off state when the detection result exceeds a predetermined value; And a reset circuit that resets the safety circuit by supplying a starting voltage from the output terminal of the discharge lamp lighting device. 4. A DC voltage generating means for generating a DC voltage, a switch for turning ON / OFF the DC voltage generation of the DC voltage generating means, and a starting voltage supplied with the DC voltage from the DC voltage generating means. And a starting circuit that outputs the starting voltage from the second output terminal when a first time has elapsed after the DC voltage was supplied, while increasing the output voltage from the first output terminal based on a predetermined time constant. An inverter, which is started by supplying a starting voltage from a second output terminal of the starting circuit, creates a high frequency voltage from the DC voltage from the DC voltage generating means and outputs the high frequency voltage, and the high frequency voltage is supplied from the inverter. And a starting voltage for starting the discharge lamp in the inverter by supplying a starting voltage from the second output terminal of the starting circuit. And a starting voltage generating circuit that terminates the generation of the starting voltage when a second time has elapsed after the starting voltage is supplied from the starting circuit, and a starting voltage is supplied from the starting circuit in a reset state. A safety circuit that detects a voltage applied to the discharge lamp after a second time has elapsed, and reduces a high frequency voltage output from the inverter when the detection result exceeds a predetermined value; And a reset circuit that resets the safety circuit by supplying a starting voltage from the output terminal of the discharge lamp lighting device. 5. The discharge lamp lighting device according to claim 1, wherein the discharge lamp is a fluorescent lamp. 6. A lighting device comprising: the discharge lamp lighting device according to any one of claims 1 to 5; and a lighting fixture main body that houses the discharge lamp lighting device.