JP2001284092A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device that can commonly control lighting of discharge lamps of different kinds with the same lighting device. SOLUTION: The discharge lamp lighting device is provided with a power conversion part P for converting an alternate current voltage into direct current voltage by a switching of a switching element connected to an alternator Vs, an inversion circuit J for getting a lighting power for a discharge lamp LA by inputting a direct current output of the power conversion part P, a lamp voltage determining circuit K1 for determining the kind of a discharge lamp LA connected with the inversion circuit J, and a control circuit N for controlling lighting power by controlling the switching operation of the switching element of the power conversion part P at a predetermined switching operation according to the determination result by the lamp voltage determination circuit K1 and the light control signals inputted from outside. The kinds of discharge lamps LA connected by the lamp voltage determination circuit K1 is determined, and the power conversion part P supplies direct current output to the inversion circuit J according to the determination result and light control signals from outside.

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.

[0002]

2. Description of the Related Art At present, discharge lamp lighting devices for lighting high pressure discharge lamps such as high pressure sodium lamps and metal halide lamps widely used in store lighting, road lighting, factory lighting, and stadiums are shown in FIG. The mainstream is a discharge lamp lighting device of a magnetic circuit type. A filter capacitor C11 connected in parallel to the AC power supply Vs, the AC power supply Vs
A copper-iron type ballast A composed of a smoothing choke coil L11 connected in series with a charging and discharging capacitor C12,
A charging capacitor C13, a pulse generating transformer T11,
And an igniter IG1 including a discharging thyristor Q11 of the capacitor C12. The copper-iron ballast A is regarded as a current source, and charges the charging / discharging capacitor C12 and the charging capacitor C13. When the voltage between both ends of the charging / discharging capacitor C12 exceeds the turn-on voltage of the discharging thyristor Q11, the thyristor Q11 becomes conductive and the discharging current of the charging / discharging capacitor C12 flows through the primary winding of the pulse generating transformer T11, T
A pulse voltage is generated in the secondary winding 11 to generate a starting voltage for the discharge lamp LA.

On the other hand, high-pressure sodium lamps used for road lighting, especially for tunnel lighting, are thinned at night to save power, or dimmed when a dimming magnetic circuit lighting device is employed. I have. FIG. 4 shows a conventional discharge lamp lighting device that performs this dimming. In this circuit, a dimming choke coil L12 is connected in series between a copper-iron ballast A and an igniter IG1, and a contact RY1 of a dimming choke coil short-circuit relay is connected in parallel with the choke coil L12. By turning on and off the contact RY1 of the relay, the lamp current flowing through the high-pressure discharge lamp LA is adjusted to perform dimming.

However, in a discharge lamp lighting device using a dimming choke coil L12 as shown in FIG. 4, only stepwise dimming such as full lighting and 50% lighting is possible.

[0005] In recent years, there has been proposed an electronic lighting device capable of continuously dimming light.

[0006]

However, in a dimming electronic lighting device, even if the wattage is the same, if the types of the discharge lamps are different, such as a metal halide lamp and a high-pressure sodium lamp, a metal halide lamp will be produced when dimming is performed. Since the lamp voltage is almost the same as when the lamp is fully lit, the high-pressure sodium lamp has different characteristics depending on the type of discharge lamp, such as the lamp voltage decreasing according to the degree of dimming. Each discharge lamp lighting device according to the type was required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a discharge lamp lighting device capable of dimming different types of discharge lamps in common with the same lighting device. .

[0008]

According to a first aspect of the present invention, there is provided a power conversion unit for converting an AC voltage into a DC voltage by switching a switching element connected to an AC power supply, and a power conversion unit. Inverter means for inputting the DC output of the unit to obtain the lighting power of the discharge lamp, discriminating means for discriminating the type of discharge lamp connected to the inverter means; And a control circuit for controlling the lighting power by controlling the switching operation of the switching element of the power conversion unit to a preset switching operation according to the optical signal, and being connected by the determination unit. The type of the discharge lamp is determined, and a DC output corresponding to the determination result and a dimming signal input from the outside is sent to the inverter means by the power conversion unit. It is intended to supply. According to this configuration, different types of high-pressure discharge lamps can be lit by the same lighting device with a predetermined dimming control.

According to a second aspect of the present invention, in the first aspect of the invention, the determining means determines the type of the connected discharge lamp by detecting a degree of a change in the lamp voltage at the time of dimming. Dimming can be performed according to the type.

According to a third aspect of the present invention, in the first aspect of the invention, the determining means determines the type of the connected discharge lamp by detecting a start time of the discharge lamp, and determines the type of the connected discharge lamp according to the type of the discharge lamp. Dimming can be performed.

According to a fourth aspect of the present invention, in the third aspect of the invention, the start time of the discharge lamp is detected by a timer circuit, and the type of the discharge lamp can be determined.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the power converter varies the DC output by controlling the on / off duty ratio of switching of the switching element. A DC output corresponding to the input dimming signal can be supplied to the inverter means.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the power converter changes the DC output by controlling the switching frequency of the switching element, so that the type of the discharge lamp and the dimming input from the outside can be achieved. A DC output corresponding to the signal can be supplied to the inverter means.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the power converter varies the DC output by controlling the on / off duty ratio and the switching frequency of the switching of the switching element. A DC output according to the type and a dimming signal input from the outside can be supplied to the inverter means.

According to an eighth aspect of the present invention, in the first aspect of the invention, the inverter means comprises a polarity inversion circuit for alternately inverting the polarity of the voltage to obtain an AC output and supply the AC output to the discharge lamp. A rectangular wave alternating voltage is applied to the, and rectangular wave lighting with less flicker can be performed.

[0016]

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

(Embodiment 1) FIG. 1 shows a circuit configuration of the first embodiment. An AC voltage supplied from an AC power supply Vs is converted into a DC voltage by a power converter P, and a DC output voltage of the power converter P Are alternately inverted by a polarity inversion circuit J as an inverter means to output an alternating current, and the igniter IG
To supply lighting power to the discharge lamp LA.

The power converter P includes a rectifier circuit DB for performing full-wave rectification of the AC voltage supplied from the AC power supply Vs, a boost chopper circuit G for boosting the full-wave rectified pulsating voltage from the rectifier circuit DB, A smoothing capacitor C1 for smoothing the output voltage of the step-up chopper circuit G, and a step-down chopper circuit H for outputting a direct current according to the result of the judgment made by the lamp voltage judgment circuit K1 as judgment means and a dimming signal inputted from the outside.
And a filter circuit I for smoothing the DC output of the step-down chopper circuit H.

The step-up chopper circuit G includes a choke coil L
1, a switching element Q1, a diode D1, and a drive circuit F3 for controlling ON / OFF of the switching element Q1. The switching element Q1 is connected between the output terminals of the rectifier circuit DB via the choke coil L1. The drive circuit F3 is configured to obtain a predetermined DC output voltage boosted across the smoothing capacitor C1.
On / off control of the switching element Q1 is performed.

The smoothing capacitor C1 is connected in parallel with the switching element Q1 via a diode D1 to smooth the output voltage of the boost chopper circuit G.

The step-down chopper circuit H includes a switching element Q2, a diode D2, a choke coil L2, and a drive circuit F1 for controlling ON / OFF of the switching element Q2. The switching element Q2 is connected in series to the diode D1, the diode D2 is connected in parallel to the electrolytic capacitor C1 via the switching element Q2, and the choke coil L2 is connected to the switching element Q2.
Are connected in series. The drive circuit F1 includes a control circuit N
ON of the switching element Q2 according to the control signal from
The DC output of the step-down chopper circuit H constituting the current limiting circuit is controlled by controlling the off-duty ratio and / or the switching frequency.

The filter circuit I includes a capacitor C3, a choke coil L3, and the like. The capacitor C3 is
The output terminal of the step-down chopper circuit H is connected in parallel, the choke coil L3 is connected in series to the choke coil L2,
A low-pass filter is constituted by the capacitor C3 and the choke coil L3.

The polarity inversion circuit J includes a switching element Q
3, Q4, Q5, Q6, a drive circuit F2, and the like. The switching elements Q3, Q4, Q5, Q6 are connected to a full bridge, and a pair of switching elements Q3, Q6 and Q4, Q5 are alternately turned on / off at a constant repetition frequency by a drive signal from the drive circuit F2. The alternating voltage is output by alternately inverting the polarity of the DC output voltage of the power converter P, and the alternating power having a frequency suitable for the discharge lamp LA is supplied.

The igniter circuit IG generates a starting pulse voltage for the discharge lamp LA. The configuration is the igniter IG of FIG.
Description is omitted because it is the same as 1.

The lamp voltage discriminating circuit K1 is constituted by an electronic circuit such as an IC, detects the lamp voltage of the discharge lamp LA through a pair of conducting switching elements of the polarity inversion circuit J, and detects the discharge lamp in the fully lit state. A change between the lamp voltage of the LA and the lamp voltage of the discharge lamp LA in the dimming state is monitored, the type of the discharge lamp LA is determined based on the degree of the change, and a determination signal is output to the control circuit N.

The conversion circuit M converts a dimming signal input from the outside into a dimming signal of the present lighting device.

The control circuit N is constituted by an electronic circuit such as an IC. The switching of the step-down chopper circuit H is performed in accordance with the discharge lamp type determination signal from the lamp voltage determination circuit K1 and the dimming signal from the conversion circuit M. The output signal of the element Q2 to the drive circuit F1 is controlled.

Next, the operation of the first embodiment will be described. For example, it is assumed that the discharge lamp LA is fully lit. Here, when a dimming signal is input from outside to dimming the discharge lamp LA, the dimming signal is input to the control circuit N via the conversion circuit M, and the control circuit N controls the dimming of the discharge lamp LA. In this manner, the output signal of switching element Q2 to drive circuit F1 is controlled, and discharge lamp LA enters a dimming state. At this time, the lamp voltage discrimination circuit K1 outputs the discharge lamp LA in the fully lit state and the dimming state.
Monitor changes in lamp voltage. For example, even when dimming the high-pressure sodium lamp, the equivalent resistance of the high-pressure sodium lamp becomes constant, and the lamp voltage of the high-pressure sodium lamp decreases. On the other hand, when dimming the metal halide lamp, the equivalent resistance of the metal halide lamp changes, and a substantially constant lamp voltage is maintained. From this, if the change is larger than a predetermined value, it is determined that the lamp is a high-pressure sodium lamp, and if it is smaller, it is determined that the lamp is a metal halide lamp.

When dimming the high pressure discharge lamp LA by the switching operation of the switching element Q2 of the step-down chopper circuit H, if the high pressure discharge lamp LA is a metal halide lamp, the equivalent resistance of the metal halide lamp changes and the lamp voltage is constant. Therefore, when the lamp power is
If it is 0%, the lamp current is turned on at about 50% of the full lighting. When the high-pressure discharge lamp LA is a high-pressure sodium lamp, the equivalent resistance of the high-pressure sodium lamp is constant. Therefore, if the lamp power is 50% of that at full lighting, the values of the lamp voltage and the lamp current respectively become the floor values at full lighting. Expressed as a power.

That is, during the dimming operation, the step-down chopper circuit H
When using frequency modulation, duty modulation, or both for switching control of the switching element Q2,
By controlling the switching frequency of the switching element Q2 and / or the on / off duty ratio in accordance with the type of the discharge lamp determined, a desired lamp can be obtained even in different types of lamps such as a high pressure sodium lamp and a metal halide lamp. Lamp power control can be performed with a dimming signal corresponding to the power.

As described above, according to the first embodiment, the discharge lamp is determined by detecting the degree of change of the lamp voltage during dimming in the dimming discharge lamp lighting device, and the discharge lamp is determined during dimming. Lamp power control according to the discharge lamp can be performed. Further, since the same discharge lamp lighting device can be used for different types of discharge lamps, it is not necessary to prepare different discharge lamp lighting devices according to the types of discharge lamps, and the cost can be reduced.

(Embodiment 2) FIG. 2 shows a circuit configuration of the second embodiment. The basic configuration is substantially the same as that of the first embodiment.
1 is not provided as a means for determining the type of the discharge lamp LA, and a lamp starting time determination circuit K2 is provided as means for determining the type of the discharge lamp LA. Other configurations are the same as those of the first embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

The lamp starting time determining circuit K2 is constituted by an electronic circuit such as an IC constituting an integrating timer, and a pair of conducting switching elements Q3 and Q3 of the polarity inverting circuit J.
6, or the lamp voltage of the discharge lamp LA is detected through Q4 and Q5, the time from when the discharge lamp LA is turned on until the voltage reaches a certain predetermined level is measured by the integrating timer, and the discharge lamp is measured based on the measurement result of the integrating timer. The type of the LA is determined, and a determination signal is output to the control circuit N.

Next, the operation of the second embodiment will be described. First, when the discharge lamp LA is turned on, the lamp voltage is low immediately after lighting, and the lamp voltage gradually rises to reach stable lighting, and the original lamp power is obtained. Here, the lamp starting time discrimination circuit K2 measures the time from when the discharge lamp LA is turned on until it reaches a predetermined lamp voltage. If it is longer than the predetermined time, it is determined that the lamp is a high-pressure sodium lamp. If there is, determine that it is a metal halide lamp.

Similarly to the first embodiment, when dimming the high pressure discharge lamp LA by the switching operation of the switching element Q2 of the step-down chopper circuit H, if the high pressure discharge lamp LA is a metal halide lamp, the equivalent resistance of the metal halide lamp changes. However, since the lamp voltage is constant, if the lamp power is 50% of the full lighting, the lamp current is about 50% of the full lighting. When the high-pressure discharge lamp LA is a high-pressure sodium lamp, the equivalent resistance of the high-pressure sodium lamp is constant. Therefore, if the lamp power is 50% of that at full lighting, the values of the lamp voltage and the lamp current respectively become the floor values at full lighting. Expressed as a power.

That is, during the dimming operation, the step-down chopper circuit H
When using frequency modulation, duty modulation, or both for switching control of the switching element Q2,
By controlling the switching frequency of the switching element Q2 and / or the on / off duty ratio, or both, according to the type of the discharge lamp that has been determined, it is possible to obtain a desired type even for different types of discharge lamps such as a high-pressure sodium lamp and a metal halide lamp. Lamp power control can be performed with a dimming signal corresponding to the lamp power.

As described above, according to the second embodiment, the discharge lamp lighting device for dimming determines the discharge lamp by detecting the starting time of the discharge lamp, and responds to the discharge lamp determined at the time of dimming. Lamp power control can be performed. Also, as in the first embodiment, the same discharge lamp lighting device can be used for different types of discharge lamps, so that it is not necessary to prepare different discharge lamp lighting devices according to the types of discharge lamps, and costs can be reduced. .

[0038]

According to the first aspect of the present invention, there is provided a power converter for converting an AC voltage into a DC voltage by switching a switching element connected to an AC power supply, and a DC output of the power converter for inputting a DC output. Inverter means for obtaining lighting power; discriminating means for discriminating the type of discharge lamp connected to the inverter means; and switching of the power converter in accordance with the discrimination result of the discriminating means and a dimming signal input from the outside. A control circuit for controlling the lighting power by controlling the switching operation of the elements to a preset switching operation, so that the type of the connected discharge lamp is determined by the determination means, and the determination result and the external A DC output corresponding to the input dimming signal is supplied to the inverter means by the power conversion unit. There is an effect that a high-pressure discharge lamp can be lighted at a predetermined dimming degree.

According to a second aspect of the present invention, in the first aspect of the invention, the determining means determines the type of the connected discharge lamp by detecting a degree of a change in the lamp voltage during dimming. There is an effect that dimming according to the type of electric lamp can be performed.

According to a third aspect of the present invention, in the first aspect, the determining means determines the type of the connected discharge lamp by detecting a start time of the discharge lamp. There is an effect that the dimming can be performed.

According to a fourth aspect of the present invention, in accordance with the third aspect of the present invention, the start time of the discharge lamp is detected by a timer circuit, so that the type of the discharge lamp can be determined.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the power converter varies the DC output by controlling the on / off duty ratio of the switching of the switching element. There is an effect that a DC output corresponding to the input dimming signal can be supplied to the inverter means.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the power converter varies the DC output by controlling the switching frequency of the switching element. There is an effect that a DC output corresponding to the signal can be supplied to the inverter means.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the power converter varies the DC output by controlling the on / off duty ratio and the switching frequency of the switching of the switching element. There is an effect that a DC output according to the type and a dimming signal input from the outside can be supplied to the inverter means.

According to an eighth aspect of the present invention, in the first aspect of the invention, the inverter means comprises a polarity inversion circuit for alternately inverting the polarity of the voltage to obtain an AC output and supply the AC output to the discharge lamp. Since the rectangular wave alternating voltage is applied to the LED, there is an effect that rectangular wave lighting with less flicker can be performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment.

FIG. 2 is a circuit diagram showing a second embodiment.

FIG. 3 is a circuit diagram showing a first conventional example.

FIG. 4 is a circuit diagram showing a second conventional example.

[Explanation of symbols]

 J polarity inversion circuit K1 lamp voltage discrimination circuit LA discharge lamp N control circuit P power conversion unit

Continued on the front page F term (reference) 3K072 AA13 AA14 BA05 BB10 EA07 EB01 EB05 GA02 GB18 GC04 HA04 HA10 HB02 3K098 CC60 DD06 DD20 DD22 DD43 EE14 EE32 FF14

Claims (8)

[Claims] 1. A power conversion unit connected to an AC power supply and converting an AC voltage into a DC voltage by switching of a switching element, an inverter unit that receives a DC output of the power conversion unit and obtains lighting power of a discharge lamp, Determining means for determining the type of the discharge lamp connected to the inverter means; and setting a switching operation of the switching element of the power converter in advance in accordance with a result of the determination by the determining means and a dimming signal input from outside. And a control circuit for controlling lighting power by controlling the switching operation. 2. The discharge lamp lighting device according to claim 1, wherein the determination means determines the type of the connected discharge lamp by detecting a degree of a change in lamp voltage during dimming. 3. The discharge lamp lighting device according to claim 1, wherein the determining means determines the type of the connected discharge lamp by detecting a start time of the discharge lamp. 4. The discharge lamp lighting device according to claim 3, wherein the start time of the discharge lamp is detected by a timer circuit. 5. The discharge lamp lighting device according to claim 1, wherein the power converter changes a DC output by controlling an on / off duty ratio of switching of the switching element. 6. The discharge lamp lighting device according to claim 1, wherein the power converter changes a DC output by controlling a switching frequency of the switching element. 7. The discharge lamp lighting device according to claim 1, wherein the power converter changes the DC output by controlling an on / off duty ratio of switching of the switching element and a switching frequency. 8. The discharge lamp lighting device according to claim 1, wherein the inverter means comprises a polarity inversion circuit for alternately inverting the polarity of the voltage to obtain an AC output and supply the AC output to the discharge lamp.