JP3956000B2 - High pressure discharge lamp lighting device and lighting fixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high pressure discharge lamp lighting device and a lighting fixture for lighting a high pressure discharge lamp such as a high pressure sodium lamp.
[0002]
[Prior art]
Generally, a lighting device for a high pressure discharge lamp is started by applying a high pressure pulse generated by a high pressure pulse generation circuit to the high pressure discharge lamp, and stops the application of the high pressure pulse when the lighting of the high pressure discharge lamp is detected. It is configured. Also, in order to prevent the high-pressure pulse from being continuously applied, such as when the high-pressure discharge lamp is not connected or when it has not started due to a lamp abnormality, the timer circuit is forced to generate a high-pressure pulse after a certain period of time. A pulse stop circuit is provided that keeps the high voltage pulse generation circuit stopped unless a predetermined reset operation is performed. An example of such a high pressure discharge lamp lighting device is disclosed in Japanese Patent Laid-Open No. 4-233198. This lighting device (conventional example) is shown in FIG. The conventional high voltage pulse generation circuit 2 of the lighting device 1 is configured between the midpoint of the transformer PT and the reference potential point, and the high voltage pulse when the lamp voltage Vl of the HID lamp 3 becomes 150 V or higher. Can be generated. The HID lamp 3 is turned on when a secondary voltage of about 230 V is applied from the ballast 4 at the start and a high voltage pulse of several thousand volts is supplied from the high voltage pulse generation circuit 2. When the HID lamp 3 is turned on and the lamp voltage Vl becomes 150 V or less, the generation of the high voltage pulse from the high voltage pulse generation circuit 2 is stopped. On the other hand, the secondary voltage appearing in the secondary winding L1 of the ballast 4 is taken out by the winding L2 and supplied to the pulse stop circuit 5. The timer 6 in the pulse stop circuit 5 starts a count operation when the secondary voltage (ramp voltage Vl) of the ballast 4 becomes 105 V or more, and when the count value reaches a predetermined value (for example, corresponding to 20 minutes), the high voltage pulse The high voltage pulse generation from the generation circuit 2 is stopped. Thus, the operating voltage of the pulse stop circuit 5 of the conventional high pressure discharge lamp lighting device 1 is lower than the operating voltage of the pulse generation circuit 2.
[0003]
[Problems to be solved by the invention]
The conventional high-pressure discharge lamp lighting device 1 has a problem in that it cannot start lighting when the power supply voltage recovers to a predetermined value after the HID lamp 3 has been extinguished due to a voltage drop caused by fluctuations in the power supply voltage. That is, since the timer of the pulse stop circuit starts timing during the period when the power supply voltage is decreasing, the timer generates a pulse before the power supply voltage recovers and the HID lamp 3 can be started by applying the pulse. This is because may be forcibly stopped.
[0004]
The present invention has been made in view of the above problems, and when the power supply voltage recovers to a predetermined voltage value or more after the high-pressure discharge lamp has been extinguished as the power supply voltage has decreased, the pulse generation circuit is operated for a certain period of time. proper pressure discharge lamp is re-lit Rutotomoni, normal supply voltage predetermined time exceeding the pulse generator can be stopped reliably pulses so as not to continue a high-pressure discharge lamp lighting after recovered to Te An object is to provide an apparatus and a luminaire.
[0005]
[Means for Solving the Problems]
The invention of the high pressure lamp lighting device according to claim 1 includes: a high pressure discharge lamp; a ballast that energizes the high pressure discharge lamp; and a predetermined voltage lower than a lower limit value of an allowable input voltage at which the ballast operates normally. A high-pressure pulse generating circuit that operates when the voltage value is higher than that and starts a high-pressure discharge lamp by superimposing a high-pressure pulse on the output of the ballast; when the high-pressure discharge lamp does not start within a certain time , A high-voltage pulse stop circuit for stopping the operation, and the high-voltage pulse stop circuit starts measuring time when the input voltage becomes equal to or higher than the time measurement start voltage, and a lower limit value of the time measurement start voltage is lower than the predetermined voltage value. high and in the range of less than the lower limit value of the allowable input voltage ballast to operate normally, the high-voltage pulse generating circuit when the high pressure discharge lamp over a predetermined time from the time of starting the time measurement does not light The generation of pressure pulses is configured to stop.
[0006]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0007]
The ballast may be either a single choke or a leakage transformer type.
[0008]
The high-pressure discharge lamp is a generic name of, for example, a high-pressure sodium lamp, a metal halide lamp, a high-pressure mercury lamp, etc., and may be any lamp that requires application of a pulse for starting.
[0009]
When the high-pressure discharge lamp is lit, if the power supply voltage drop that cannot maintain the discharge occurs, the high-pressure discharge lamp goes off and turns off. Thereafter, when the power supply voltage recovers to a voltage for operating the high voltage pulse generation circuit, the high voltage pulse generation circuit generates a high voltage pulse and applies it to the high pressure discharge lamp. The high-pressure discharge lamp is discharged by a high-pressure pulse and is lit again. Since the pulse stop circuit starts timing when it returns to a voltage value higher than the voltage at which the high- pressure pulse generating circuit operates, the pulse is applied to the high-pressure lamp for a certain period of time until starting. Further, since the upper limit value of the voltage for timing operation of the pulse stop circuits are the following ballast secondary voltage when the allowable minimum value of the supply voltage, when the high-pressure discharge lamp has occurred an abnormality, the pulse long There is no problem of continuing to apply.
[0010]
The invention of the high pressure discharge lamp lighting device according to claim 2 includes: a high pressure discharge lamp; a ballast for energizing the high pressure discharge lamp; and an input voltage equal to or higher than a predetermined voltage value lower than 94% of a rated input value of the ballast A high-pressure pulse generation circuit that operates when the high-pressure pulse is superimposed on the output of the ballast and starts the high-pressure discharge lamp; and stops the high-pressure pulse generation circuit when the high-pressure discharge lamp does not start within a certain time A high-voltage pulse stop circuit, and the high-voltage pulse stop circuit starts measuring time when the input voltage becomes equal to or higher than the time measurement start voltage, and a lower limit value of the time measurement start voltage is higher than the predetermined voltage value , and in the range of 94% or less of the rated input value of the ballast, to stop the generation of the high voltage pulse of the high-voltage pulse generating circuit when the high pressure discharge lamp over a predetermined time from the time of starting the time measurement does not light Is constructed sea urchin.
[0011]
The secondary voltage of the ballast is the secondary voltage at no load.
[0012]
The upper limit value of the voltage for clocking the pulse stop circuit is 94% or less of the secondary voltage of the ballast, and the pulse stop circuit is functioning when the power supply voltage recovers to the normal power supply voltage fluctuation. At this time, if the high pressure discharge lamp is unsatisfactory, the timer operates to stop the generation of the high pressure pulse after a lapse of a certain time.
[0013]
An invention of a lighting fixture according to a third aspect includes the high pressure discharge lamp lighting device according to the first or second aspect; and a lighting fixture main body that houses the high pressure discharge lamp.
[0014]
When the power supply voltage is restored even if a voltage drop occurs, a high voltage pulse is applied to the high pressure discharge lamp and the lamp is turned on again, so that a lighting fixture with improved marketability can be provided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 3 is a cross-sectional view of a lighting fixture showing an embodiment of the present invention. The luminaire 10 includes a luminaire main body 11, a high-pressure sodium lamp 13, a reflecting mirror 14, and the like, and a high-pressure discharge lamp lighting device 12 is housed inside the luminaire main body 11. The high pressure discharge lamp lighting device 12 is connected to the high pressure sodium lamp 13 by a commercial power source and wiring (not shown), and lights the high pressure sodium lamp 13.
[0017]
FIG. 1 is a circuit diagram of a high pressure discharge lamp lighting device showing an embodiment of the present invention. The high-pressure discharge lamp lighting device 12 is connected to a commercial power source Vs (rated at 200 V) via a power switch SW1. The ballast 15 is a single choke and has one end connected to the power switch SW1 and the other end connected to one end of the high-pressure sodium lamp 13. The other end of the high-pressure discharge lamp 13 is connected to the commercial power source Vs via the current detection circuit 16. The pulse stop circuit 17 is connected in parallel with the commercial power source Vs via the power switch SW1, and uses the voltage of the commercial power source Vs as an input power source. Further, a high voltage pulse generation circuit 18 is connected between a connection point of one end of the ballast 15 and the high pressure sodium lamp 13 and a connection point of the other end of the high pressure sodium lamp 13 and the current detection circuit 16. The no-load input power supply of the high voltage pulse generation circuit 18 is the voltage of the commercial power supply Vs because the ballast 15 is a single choke. Lower limit voltage for timing operation of the pulse stop circuit 17 is higher than the lower limit voltage to operate the high-voltage pulse generating circuit 18, is set to 94% or less of the voltage no-load secondary voltage of the ballast 15. The high voltage pulse generation circuit 18 is connected to the middle point of the winding of the ballast 15 to cause the ballast 15 to generate a high voltage pulse. Further, the pulse stop circuit 17 and the high voltage pulse generation circuit 18 are connected. A timer (not shown) is built in the pulse stop circuit 17, and the pulse generation function of the high-pressure pulse generation circuit 18 is activated by the pulse stop circuit 17 after about 20 minutes have elapsed after detecting no load or a fault of the high-pressure sodium lamp 13. I try to stop it. The current detection circuit 16 detects the lamp current when the high pressure sodium lamp 13 is lit, stops the pulse generation function of the high pressure pulse generation circuit 18, and resets the pulse stop circuit 17 . The capacitor C1 is a power factor improving capacitor, and the resistor R1 is a discharge resistance of the capacitor C1. The rated power of the high pressure sodium lamp 13 is 360 W, and the rated lamp voltage is 130V.
[0018]
Next, the operation of the embodiment of the present invention will be described.
[0019]
When the power switch SW1 is turned on, the secondary voltage of the ballast 15 is supplied to the high-pressure sodium lamp 13. Since the high-voltage pulse generation circuit 18 is supplied with the power supply voltage of the commercial power source Vs at the time of starting, the high-voltage pulse generation circuit 18 operates to generate a high-pressure pulse in the ballast 15 and turn on the high-pressure sodium lamp 13 . When the high-pressure sodium lamp 13 is lit, a current that is mainly a lamp current flows in the current detection circuit 16. The current detection circuit 16 stops the high voltage pulse generation function of the high voltage pulse generation circuit 18 so that the ballast 15 does not generate a high voltage pulse, and stops and resets the timer operation of the pulse stop circuit 17.
[0020]
Even if the power switch SW1 is turned on, if the high pressure sodium lamp 13 is not lit, the high voltage pulse generation circuit 18 and the pulse stop circuit 17 are supplied with the power supply voltage of the commercial power source Vs. 17 also works. The high voltage pulse generation circuit 18 continuously generates a high voltage pulse in the ballast 15 and applies it to the high pressure sodium lamp 13. Since the current detection circuit 16 does not detect current, the high-pressure pulse generation function of the high-voltage pulse generation circuit 18 is stopped approximately 20 minutes after the timer of the pulse stop circuit 17 starts measuring time with the operation of the pulse stop circuit 17. The high pressure pulse is not applied to the lamp 13 . The secondary voltage of the ballast 15, that is, the power supply voltage, is constantly applied to the high-pressure sodium lamp 13 unless the power switch SW1 is opened.
[0021]
When a high power supply voltage drop occurs while the high pressure sodium lamp 13 is lit, the high pressure sodium lamp 13 goes off. For example, when the high-pressure sodium lamp 13 is used as tunnel lighting, it is assumed that the fan operates and the power supply voltage drops to 70% of the rating, that is, 140V. The operating voltage Va of the high voltage pulse generation circuit 18 is set to 80% of the secondary voltage of the ballast 15, and the operating voltage Vb of the pulse stop circuit 17 is set to 94%. Since the ballast 15 is a single choke, the secondary voltage of the ballast 15 is equal to the power supply voltage, the operating voltage Va of the high voltage pulse generating circuit 18 is 160V, and the operating voltage Vb of the pulse stop circuit 17 is 188V. When the dropped power supply voltage recovers to 160 V, the high voltage pulse generation circuit 18 generates a high voltage pulse in the ballast 15 and applies it to the high voltage sodium lamp 13. This high-pressure pulse is applied until the high-pressure sodium lamp 13 is turned on. When the high-pressure sodium lamp 13 is turned on, the current detection circuit 16 detects the current and stops the high-pressure pulse generation circuit 18, so that no high-pressure pulse is generated in the ballast 15. When the power supply voltage further recovers and reaches 188 V, the pulse stop circuit 17 operates. At this time, if the high-pressure sodium lamp 13 is not lit, the timer of the pulse stop circuit 17 starts timing, and if the high-pressure sodium lamp 13 is not lit within a certain time (for example, 20 minutes), the high-pressure pulse generation circuit 18 is stopped. Let The fixed time may be determined as appropriate. Since the high voltage pulse is not applied to the high pressure sodium lamp 13 and only the secondary voltage of the ballast 15, that is, the power supply voltage is applied, the high pressure sodium lamp 13 is not lit. Case of applying a high voltage pulse to the high pressure sodium lamp 13, and the reset of the commercial power source Vs or pulse stop circuit 17, turns on the power switch SW1 again.
[0022]
The time measurement start voltage of the pulse stop circuit 17 is higher than the voltage at which the high voltage pulse generation circuit 18 starts pulse generation , and the ballast 15 has a lower limit value (94% of the rated voltage) of the allowable range of power supply voltage fluctuation. Secondary voltage or less. This is indicated by the hatched portion in FIG. By setting the operation start voltage of the pulse stop circuit 17 to a voltage in the range shown by the hatched portion in FIG. 2, a high pressure pulse is applied to the high pressure sodium lamp 13 before the pulse stop circuit 17 operates. The lamp is likely to turn on again. If the high voltage sodium lamp 13 is unsatisfactory due to an abnormality or the like when the power supply voltage is restored to the rated value or close to the rated value, the pulse stop circuit 17 operates and a high voltage pulse generating circuit is activated after a lapse of a certain time (for example, 20 minutes). Since the operation of 18 is stopped to prevent generation of a pulse, insulation deterioration of the lamp socket , the fixture, the ballast 15 and the like can be prevented.
[0023]
【The invention's effect】
According to the first or second aspect of the invention, since the lower limit value of the timing start voltage of the pulse stop circuit is higher than the predetermined voltage value for operating the high-voltage pulse generation circuit, the power supply voltage drops and the power supply is turned off after the high-pressure discharge lamp goes off. Before the voltage rises and the pulse stop circuit operates, a high voltage pulse is generated and applied continuously for at least a certain time, and the lamp is lit again.
[0024]
In addition , the pulse stop circuit always starts timing when the power supply voltage has recovered to the normal power supply voltage fluctuation, so if the lamp is faulty after recovery of the power supply voltage , it will generate a high voltage pulse over a certain time. Without being continued, it can be stopped reliably after a certain period of time and insulation deterioration of lamp sockets , fixtures and ballasts can be prevented.
[0025]
According to the invention of claim 3, even if the power supply voltage drops and the lamp is turned off, it is turned on again when the power supply voltage is restored, so that a lighting apparatus with high marketability can be provided.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a high-pressure discharge lamp lighting device showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an operating voltage showing the embodiment of the present invention.
FIG. 3 is a cross-sectional view of a lighting fixture showing an embodiment of the present invention.
FIG. 4 is a circuit diagram of a conventional high-pressure discharge lamp lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Lighting fixture 11 Lighting fixture main body 12 High pressure discharge lamp lighting device 13 High pressure sodium lamp 15 Ballast 17 Pulse stop circuit 18 High pressure pulse generation circuit

Claims (3)

A high-pressure discharge lamp;
A ballast for energizing the high-pressure discharge lamp;
High-voltage pulse generation circuit that operates when the input voltage is equal to or higher than a predetermined voltage value that is lower than the lower limit of the allowable input voltage for normal operation of the ballast, and superimposes the high-voltage pulse on the output of the ballast to start the high-pressure discharge lamp When;
A high-pressure pulse stop circuit that stops the operation of the high-pressure pulse generation circuit when the high-pressure discharge lamp does not start within a predetermined time ;
With
The high voltage pulse stop circuit starts timing when the input voltage becomes equal to or higher than the timing start voltage, and the lower limit value of the timing start voltage is higher than the predetermined voltage value , and the allowable input voltage at which the ballast operates normally. The high-pressure pulse generation circuit is configured to stop the generation of the high- pressure pulse when the high-pressure discharge lamp does not light for a certain period of time from the start of timing. High pressure discharge lamp lighting device. A high-pressure discharge lamp;
A ballast for energizing the high-pressure discharge lamp;
A high-pressure pulse generating circuit that operates when the input voltage is equal to or higher than a predetermined voltage value lower than 94% of the rated input value of the ballast, and superimposes the high-pressure pulse on the output of the ballast to start the high-pressure discharge lamp;
A high-pressure pulse stop circuit that stops the operation of the high-pressure pulse generation circuit when the high-pressure discharge lamp does not start within a predetermined time ;
With
The high voltage pulse stop circuit starts timing when the input voltage becomes equal to or higher than the timing start voltage. The lower limit value of the timing start voltage is higher than the predetermined voltage value and is 94% or less of the rated input value of the ballast. The high-pressure discharge lamp is configured to stop the generation of the high-pressure pulse of the high- pressure pulse generation circuit when the high-pressure discharge lamp does not light for a certain period of time from the start of timing. Lighting device. A high pressure discharge lamp lighting device according to claim 1 or 2;
A luminaire body that houses the high-pressure discharge lamp;
The lighting fixture characterized by comprising.

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