JP3262125B2 - Discharge lamp lighting device - Google Patents

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,
In particular, the present invention relates to a discharge lamp lighting device suitable for lighting a small metal halide lamp or the like.

[0002]

2. Description of the Related Art Conventionally, HIDs such as metal halide lamps have been used.
(High Intensity Discharge) lamps are used for outdoor lighting and the like because of their high efficiency and high brightness. It takes a few minutes for the HID lamp to reach a normal lighting state after the start of discharge until the temperature of the arc tube increases and the vapor pressure of the enclosure increases.

In a conventional discharge lamp lighting device for lighting such an HID lamp, a commercial AC power supply of 100 V or 200 V and a low frequency of 50 Hz or 60 Hz is employed. The power supply voltage from the commercial AC power supply is provided to the ballast, and the secondary voltage appearing on the secondary winding of the ballast is supplied to the HID lamp via the starter.

[0004] The starter has a high voltage pulse generating circuit. The high-voltage pulse generating circuit is supplied with the secondary voltage of the ballast, and generates a high-voltage pulse (thousands of volts) for starting the HID lamp using, for example, an SSS (two-terminal thyristor). When the HID lamp is turned on, the high voltage pulse generation circuit stops generating the high voltage pulse.

By the way, in order for the HID lamp to light up, the arc tube temperature must be low. Therefore, the time until the lamp is turned on differs depending on the temperature of the arc tube when the power is turned on. For example, after the lamp is turned off, it takes several minutes before the temperature of the arc tube decreases to be in a state where relighting is possible. For this reason, the high-voltage pulse generating circuit can continuously generate high-voltage pulses when the power is turned on.

However, as at the end of lamp life,
If the HID lamp has an abnormality, the lamp voltage may increase after lighting and turn off. In this case, there is a possibility that the high pressure pulse is generated again, the HID lamp is turned on, and the blinking is repeated. Further, even when the HID lamp is abnormal and does not turn on, a high-voltage pulse is continuously generated. Since the high-voltage pulse is extremely high, wiring and equipment are adversely affected in this case, which is dangerous.

Therefore, for example, Japanese Patent Application Laid-Open No. 63-30769 (1988)
As disclosed in Japanese Patent Application Publication No. 5 (JP-A-5), a pulse stop circuit for controlling the generation time of a high-voltage pulse may be employed. The pulse stop circuit has a timer, and obtains an elapsed time after power-on. Normally, the pulse stop circuit operates the high-voltage pulse generating circuit for several minutes (for example, 20 minutes) after the power is turned on, and then stops the generation of the high-voltage pulse in order to perform reliable lighting. Thus, safety is ensured by the pulse stop circuit.

[0008] However, the discharge lamp that is stably lit normally can be affected by, for example, an instantaneous power failure and fluctuations in power supply voltage.
It may turn off. In this case, if the elapsed time from the power-on exceeds the time set by the timer, no high-voltage pulse is generated, so that the power must be reset to turn on the HID lamp again. For example, in a store or the like, when one HID lamp is turned off, in order to turn on the HID lamp again, after turning off the power and turning off all other HID lamps, several minutes for turning on again. Need time.

[0009] At present, noise generation due to a high-voltage pulse for starting a discharge lamp is becoming an issue. In order to reduce this noise, it is advantageous to arrange the high-voltage pulse generating circuit adjacent to the discharge lamp to shorten the line length between them. However, in the existing discharge lamp lighting device of this type, the high-voltage pulse generation circuit and the stop circuit are often housed in the case together with the ballast portion. If so, the ballast part will also be placed in close proximity. In such a case, an extra space is required around the lighting fixture to which the discharge lamp is attached, and it is often installed in a limited space such as a space above a ceiling, which causes a practical problem. Therefore, it is conceivable that the high-voltage pulse generation circuit and the stop circuit are separate from the ballast.However, the conventional pulse stop circuit is configured to operate using the input voltage of the ballast as the operating voltage. Then, there is a problem that the number of wirings to the high-voltage pulse generation circuit, the pulse stop circuit, and the ballast increases.

[0010]

As described above, in the above-described conventional discharge lamp lighting device, when the pulse stop circuit is not employed, blinking of an abnormal discharge lamp may be repeated. When the pulse stop circuit is adopted, there is a problem that the power supply must be reset in order to turn on the lamp again after the generation of the high voltage pulse is stopped.

Furthermore, in the conventional discharge lamp lighting device, the high-voltage pulse generating circuit and the pulse stopping circuit cannot be formed separately from the ballast without increasing the number of wirings, so that the high-voltage pulse triggers. There is a problem that noise that cannot be suppressed cannot be suppressed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to ensure safety, to enable a lamp to be turned on again after a light is turned off without resetting a power source, and to provide a discharge lamp that is abnormally turned on. It is an object of the present invention to provide a discharge lamp lighting device capable of preventing re-lighting when a light goes out.

Further, the present invention enables the high-voltage pulse generating circuit and the pulse stopping circuit to be arranged separately from the ballast and close to the discharge lamp without increasing the number of wirings,
An object of the present invention is to provide a discharge lamp lighting device capable of suppressing noise induced by a high-voltage pulse.

[0014]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device comprising: a ballast; a high pressure discharge lamp energized by a secondary voltage of the ballast; At the end of the life of the supplied and preset high pressure discharge lamp
High-voltage pulse generating circuit and than flop voltage to generate a high voltage pulse at the start of the discharge lamp by supplying a large voltage; operates as the operating voltage of the secondary voltage, start of the discharge lamp
Secondary when the discharge lamp is operating normally during operation
When the time to reach the voltage is measured and exceeds the specified time
The high-pressure pulse is stopped and the discharge lamp is
When the secondary voltage is supplied during normal lighting of
And a pulse stop circuit that is activated by the ballast. The discharge lamp lighting device according to claim 2 of the present invention is energized by a ballast and a secondary voltage of the ballast. high-pressure discharge lamp and, the secondary voltage of the ballast is supplied, and in advance set
Greater than the lamp voltage at the end of the life of the specified high-pressure discharge lamp.
A high voltage pulse generating circuit for generating a high voltage pulse at the start of the discharge lamp by supplying an Kina voltage; said secondary collector
When the discharge lamp starts, the discharge lamp
When the LED lights up normally,
The high-pressure pulse is measured when the time exceeds
Stop and normal operation of the discharge lamp within a predetermined time.
And a pulse stop circuit for stopping the generation of the high-voltage pulse from the high-voltage pulse generation circuit when at least the lamp voltage of the discharge lamp is outside a predetermined range when the secondary voltage is supplied. It is characterized by having.

In the first aspect of the present invention, the high voltage pulse generating circuit is supplied with the secondary voltage of the ballast and generates a high voltage pulse for lighting the discharge lamp when the discharge lamp is started. When the power is turned on, a secondary voltage higher than the secondary voltage when the discharge lamp is normally lit is supplied to the pulse stop circuit, the pulse stop circuit starts counting, and the high voltage pulse generation circuit generates a high voltage pulse. As a result, when the discharge lamp lights up normally,
The pulse stop circuit is reset. Thereafter, even when the discharge lamp is turned off, a high-voltage pulse is generated without resetting the power supply, and the discharge lamp can be turned on again. In addition, when the discharge lamp is abnormally turned on, the secondary voltage in the normal state is not supplied, so that it counts up after a predetermined time.
Therefore, even if the discharge lamp is turned off after abnormal lighting, the high pressure pulse is not generated from the high voltage pulse generation circuit and the discharge lamp is not turned on again.

[0016]

According to a second aspect of the present invention, the pulse stop circuit controls the high voltage pulse generation circuit so as to stop the generation of the high voltage pulse when the lamp voltage of the discharge lamp continues to be outside the predetermined range. Therefore, safety can be secured without starting an abnormal discharge lamp.

[0018]

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing one embodiment of a discharge lamp lighting device according to the present invention.

HID lamp on secondary side of ballast not shown
The other end of the winding L1 of the transformer connected in parallel with the terminal 2 is connected to the terminal a of the fuse 1, and the other end is connected to the reference potential point. Terminal b of the fuse 1 is connected to the midpoint of the pulse transformer PT, between the middle point and a reference potential point is the secondary winding L3 and HID lamp 2 is connected to the pulse tiger <br/> Nsu PT I have. Between the midpoint and a reference potential point of the pulse transformer PT, the capacitor C1, C2, of the pulse transformer PT 1
Next winding L4, coil L5, resistors R1 to R7, SSS
A high-voltage pulse generating circuit 7 including 3, 4, a triac 5, and a diac 6b as a light receiving element of a photocoupler is also connected.

That is, the middle point of the pulse transformer PT is connected to the reference potential point via the capacitors C1 and C2 and the triac 5, and a resistor R1 is connected to the capacitor C1 in parallel. The primary winding L4 is connected in parallel with the capacitor C1.
, A series circuit of coils L5 and SSS3, 4 are connected, and a series circuit of resistors R2 to R5 is connected in parallel with the capacitor C2. The triac 5 is connected in parallel with a series circuit including a resistor R6, a diac 6b and a resistor R7. The diac 6b emits light when a light emitting diode 6a of a photocoupler described later is turned on to emit light.
When turned on, an on-pulse is given to the triac 5. The triac 5 is turned on by an on pulse from the diac 6b. The high-voltage pulse generation circuit 7 uses SSS3,4
When the lamp voltage VL of the HID lamp 2 becomes 150 V or more, a high-voltage pulse can be generated.

On the other hand, an HID lamp 2 is provided on the secondary side of the ballast.
2 of the ballast appearing in the winding L1 of the transformer connected in parallel
The next voltage is taken out by the winding L2 and the pulse stop circuit 10
It is supplied to. The winding L2 is connected to a full-wave bridge rectifier circuit 8 via a resistor R8. A Zener diode ZD1 and a smoothing capacitor C3 are connected between the positive output terminal and the negative output terminal of the full-wave bridge rectifier circuit 8.
Are connected in parallel. These full-wave bridge rectifier circuit 8, Zener diode ZD1 and smoothing capacitor C3
, The timer 9 operates.

That is, the third and seventh pins of the timer 9 are connected to the positive output terminal of the full-wave bridge rectifier circuit 8,
The number pin is connected to the negative output terminal. The first pin of the timer 9 is connected to a positive output terminal via a diode D1 and to a negative output terminal via a capacitor C4. Further, the first pin of the timer 9 is connected to a negative output terminal via a resistor R9 and a capacitor C5, and the fifth pin is connected to a connection point of the resistor R9 and the capacitor C5. The capacitors C4 and C5 and the resistor R9 form a time constant circuit, and the oscillation frequency of a built-in oscillator (not shown) of the timer 9 is determined.

The timer 9 operates when a predetermined voltage appears between the positive output terminal and the negative output terminal of the full-wave bridge rectifier circuit 8. This predetermined voltage is adjusted by the resistor R8. In this embodiment, the counting operation starts when the secondary voltage (lamp voltage VL) of the ballast becomes 105 V or more, and is reset when the lamp voltage VL becomes 105 V or less. It is supposed to be. Timer 9
Counts the oscillation pulse of the built-in oscillator, and from the start of counting until the count value reaches a predetermined value (for example, corresponding to 20 minutes), a high level (hereinafter, “H”)
Output). The second and sixth pins of the timer 9 are commonly connected, and when the count value reaches a predetermined value, the second pin is set to a low level by the sixth pin (hereinafter, referred to as the second pin).
"L"). The timer 9 can resume counting only when reset after counting up.

The second and sixth pins of the timer 9 are connected to the base of the transistor Q via a resistor R10. The base of the transistor Q is connected to the negative output terminal of the full-wave bridge rectifier circuit 8 through a parallel circuit of a capacitor C6 and a resistor R11, and the collector is a light emitting diode 6 of a photocoupler.
a, is connected to a positive output terminal via a Zener diode ZD2 and a resistor R12, and the emitter is connected to a negative output terminal.

Next, the operation of the discharge lamp lighting device thus configured will be described with reference to FIG. FIG. 2 shows the power supply voltage on the horizontal axis and the lamp voltage VL on the vertical axis,
5 is a graph showing a normal lighting region (shaded portion) of the D lamp 2.

The HID lamp 2 is turned on when a secondary voltage of about 230 V is applied from a ballast and a high voltage pulse of several thousands V is supplied from a high voltage pulse generating circuit 7 at the time of starting. When the HID lamp 2 is normally lit, the lamp voltage VL is in the range of 80 to 105 V, as is apparent from the normal lighting region indicated by the hatched portion in FIG. At the end of the life of the HID lamp 2, H
It is assumed that the ID lamp 2 does not turn on normally and the lamp voltage VL remains in the range of 105 to 150 V for a relatively long time.

At the start of lamp lighting, 100 not shown
By turning on the AC power supply and V, Trang from ballast
A secondary voltage of about 230 volts appears in the winding L1. Winding L
2 is a resistor R8, a full-wave bridge rectifier circuit 8, a Zener diode ZD1 and a smoothing capacitor C3.
As a result, a predetermined voltage is obtained. With this constant voltage, the timer 9 starts the count operation, and the second pin exhibits “H”. Then, the transistor Q is turned on, a voltage based on the resistor R12 and the Zener diode ZD2 is applied to the light emitting diode 6a of the photocoupler, and the light emitting diode 6a is turned on. Then, the diac 6b as a light receiving element is turned on, an ON pulse is supplied to the triac 5, and the triac 5 is turned on.

As a result, the secondary voltage of the ballast is applied to the middle point of the pulse transformer PT via the fuse 1, and the capacitors C1 and C2 are charged. When the capacitor C1 is charged and its terminal voltage reaches the break voltage of SSS3,4, the charge of the capacitor C1 is transferred via the primary winding L4 of the pulse transformer PT, the coil L5 and the SSS3,4. And a pulse is generated in the primary winding L4. Note that the capacitor C2 is used for voltage division, and a capacitor is employed to match the phases. In addition, coil L4
Is for adjusting the peak of the pulse generated in the primary winding L4.

The pulse generated in the primary winding L4 is boosted by the pulse transformer PT, and is applied to the secondary winding L3 by several thousand volts.
High-voltage pulse is generated. Thereby, the HID lamp 2
Lights up, and the lamp voltage VL falls to a voltage range of 80 to 105 V indicated by oblique lines in FIG.

At the time of normal lighting, the lamp voltage in the range of 80 to 105 V is maintained. Lamp voltage VL is 105V
The voltage at the positive output terminal of the full-wave bridge rectifier circuit 8 decreases, and the timer 9 is reset. The HID lamp 2 is turned on and the lamp voltage VL
Is lower than 150 V, the generation of the high voltage pulse from the high voltage pulse generation circuit 7 is stopped.

Assume that the HID lamp 2 is turned off due to an instantaneous power failure or the like. Then, the lamp voltage VL
Becomes higher than 150 V, the timer 9 starts counting again, and the high-voltage pulse generating circuit 7 generates a high-voltage pulse again. The timer 9 outputs "H" from pin 2 for 20 minutes from the start of counting, and the HID lamp 9 is reliably turned on again.

Here, it is assumed that the HID lamp 2 is at the end of its life. In this case, the lamp voltage VL of the HID lamp 2 becomes higher than 105 V after lighting, and the HID lamp 2 may be almost extinguished. Lamp voltage VL is 105V
When it becomes higher, the timer 9 starts counting again. Thus, the light emitting diode 6a and the diac 6b are turned on, the triac 5 is turned on, and the capacitors C1 and C2 are charged. However, in this case, since the HID lamp 2 is not reliably turned off, the lamp voltage VL does not easily reach 150V.
After the elapse of 20 minutes, the second pin of the timer 9 becomes "L", and the light emitting diode 6a and the diac 6b are turned off. That is, when 20 minutes have elapsed after the abnormal lighting of the HID lamp 2, the triac 5 is turned off, and the high-voltage pulse generating circuit 7 does not generate a high-voltage pulse even if the lamp voltage VL subsequently increases. Therefore, HI at the end of life
Even if the D lamp 2 is turned off, it does not turn on again, and the blinking of the lamp is not repeated.

As described above, in this embodiment, the count of the timer 9 of the pulse stop circuit 10 is controlled by the secondary voltage of the ballast, that is, the lamp voltage VL. H
When the ID lamp 2 is normally turned on, the timer 9 is reset. Therefore, even if the timer 9 is turned off when the power is turned on for some reason, the timer 9 restarts counting, and a high-voltage pulse is generated from the high-voltage pulse generation circuit 7 so that the HID lamp 2
Lights up again. Therefore, a plurality of HIs can be supplied from one power supply.
When the power supply voltage is supplied to the D lamp, even if one HID lamp is turned off, the power supply voltage is turned off and all the HID lamps are turned off.
The turned off lamp can be turned on again without turning off the lamp. Further, the pulse stop circuit 10 activates the high-voltage pulse generation circuit 7 when the HID lamp 2 enters an abnormal lighting state when reset, and the high-voltage pulse generation circuit 7 operates when the HID lamp 2 is surely turned off. Only high voltage pulses are set to generate. Therefore, when the HID lamp 2 is abnormally turned on, such as at the end of the life of the HID lamp 2, the timer 9 counts up before a high-voltage pulse is generated. There is no flashing.

[0035]

[0036]

[0037]

[0038]

[0039]

As described above, according to the present invention, safety can be ensured, the lamp can be turned on again without resetting the power supply, and the abnormally turned on discharge lamp is turned off. This has the effect of preventing re-lighting in the event of a failure.

Further, according to the first aspect of the present invention,
Without increasing the number of wirings, the high-voltage pulse generating circuit and the pulse stopping circuit can be arranged separately from the ballast and close to the discharge lamp, so that noise induced by the high-voltage pulse can be suppressed.

[Brief description of the drawings]

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

FIG. 2 is a graph for explaining the operation of the embodiment.

[Explanation of symbols]

 2 ... HID lamp 7 ... High voltage pulse generation circuit 9 ... Timer 10 ... Pulse stop circuit

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 41/18 340

Claims (2)

(57) [Claims] 1. A ballast and; a high-pressure discharge lamp which is energized by the secondary voltage of the ballast; secondary voltage of the ballast is supplied, and a preset pressure
Supply a voltage higher than the lamp voltage at the end of the life of the discharge lamp.
A high voltage pulse generating circuit for generating a high voltage pulse at the start of the discharge lamp by being fed; operating the secondary voltage as the operating voltage, the discharge lamp start
Time, the secondary power corresponding to when the discharge lamp is lit normally
Measures the time until the pressure reaches
The high-pressure pulse is stopped, and the discharge lamp is
Timing is initialized when secondary voltage is supplied during normal lighting
And a pulse stop circuit. A ballast; a high-pressure discharge lamp energized by the ballast secondary voltage; a ballast secondary voltage supplied and a preset high voltage.
Supply a voltage higher than the lamp voltage at the end of the life of the discharge lamp.
A high-voltage pulse generating circuit for generating a high-voltage pulse when the discharge lamp is started by being supplied with electricity; operating the secondary voltage as an operating voltage to start the discharge lamp
Time, the secondary power corresponding to when the discharge lamp is lit normally
Measures the time until the pressure reaches
The high-pressure pulse is stopped, and the discharge lamp is
Timing is initialized when secondary voltage is supplied during normal lighting
It is, when the lamp voltage of at least the discharge lamp is out of the predetermined range, a pulse stop circuit for stopping the generation of the high voltage pulse from the high-voltage pulse generating circuit; a discharge lamp lighting apparatus, characterized in that it comprises.