JPH08273876A - Lighting device for discharge lamp, discharge lamp lighting device and lighting system - Google Patents

Abstract

PURPOSE: To keep lighting of a discharge lamp even when a block DC supply unit is broken down by arranging a rectifying, smoothing circuit in an inverter circuit connected to the block DC supply unit. CONSTITUTION: In a lighting system 1, a power supply unit switching means 9 is interposed between a commercial AC supply unit 2 and a block DC supply unit 3, and the commercial AC supply unit 2 is connected to an electric power line 4 in place of the DC supply unit 3 so as to be capable of switching. Inverter circuits 6a, 6b, 6c,... each has a rectifying, smoothing circuit in the front stage of a voltage detecting circuit in an input part. In this system constitution, when abnormality generates in DC voltage outputted to the electric power line 4, it is detected with a detecting means 10, the power supply unit switching means 9 separates the DC supply unit 3 from the AC supply unit 2, and is switched so as to directly connect the AC supply unit 2 to the electric power line 4. In the circuit 6a,..., AC voltage from the AC supply unit 2 is converted into DC voltage, and lighting of a discharge lamp 8a,... is controlled.

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, a discharge lamp lighting device and a lighting system for dimming and lighting a discharge lamp using a collective DC power supply.

[0002]

2. Description of the Related Art In recent years, some lighting devices for lighting a discharge lamp are provided with a dimming function in order to enhance their commercial value. There are various methods for dimming the discharge lamp, but in any case,
A dedicated dimming line for sending a dimming level signal is wired to an inverter circuit for dimming the discharge lamp. The dimming level is set for each discharge lamp (each inverter circuit) and the dimming lighting is performed.

However, when considering the facility lighting in a store or the like, since a large number of discharge lamps are handled, it is not preferable that a dedicated dimming line is required for each discharge lamp because it is wasteful on wiring and it is not preferable. The operation of the light lighting control becomes troublesome.
In particular, for dimming lighting in stores, etc., use dark light (deep dimming level) for rows on the window side that are bright due to outside light, and light dimming (shallow dimming level) for rows on the back side. Considering good points, it is troublesome to perform a dimming operation for each individual discharge lamp.

In consideration of such a point, by using a collective DC power source and outputting a DC voltage corresponding to the dimming level to the DC output line, the inverter of the discharge lamp lighting device connected to the DC output line. A lighting system has been proposed in which a DC voltage is detected in a circuit and dimming control is performed according to the DC voltage to turn on a discharge lamp. That is,
Seen from the inverter circuit side, the value of the supplied DC voltage itself includes the dimming level information. In the case of the above-mentioned store example, collective DC power supplies are prepared for the window side row, the back side row, and the middle row. According to this, it suffices to connect the discharge lamp lighting device for lighting at the same dimming level to the DC output line of the common collective DC power source, and the dedicated dimming line can be eliminated.

[0005]

However, in the case of such a dimming system using a collective DC power supply, if the collective DC power supply fails and goes down for some reason, the discharge lamp lighting device of any discharge lamp is connected through the DC output line. No output will be output to the inverter circuit. As a result, the inverter circuit does not function and all the discharge lamps of the entire system are turned off. This is not preferable for lighting facilities such as stores.

In view of this, the present invention relates to a discharge lamp which is connected to a common collective DC power source and is dimmed and lit so that the lighting state can be maintained even if the collective DC power source goes down due to a failure or the like. An object of the present invention is to provide a lighting device, a discharge lamp lighting device, and a lighting system using the lighting device.

[0007]

The discharge lamp lighting device according to the present invention is switchably connected to a collective DC power source for outputting a DC voltage indicating a dimming level and a commercial AC power source. The input section includes an inverter circuit that has a rectifying / smoothing circuit and a voltage detection circuit that detects the value of the supplied DC voltage, and that dims the discharge lamp.

A second aspect of the present invention is the discharge lamp lighting device according to the first aspect of the present invention, in which the rectifying / smoothing circuit includes a full-wave rectifying circuit.

A discharge lamp lighting device according to a third aspect of the invention is
The discharge lamp lighting device according to claim 1; and a discharge lamp that is energized by the discharge lamp lighting device.

The lighting system according to the invention of claim 4 includes: a collective DC power source for outputting a DC voltage indicating a dimming level; a commercial AC power source for outputting an AC voltage; and a collective DC power source and a commercial AC power source. The discharge lamp lighting device according to claim 3, which is switchably connected to the discharge lamp lighting device; and a power supply switch for switching the power supply for the inverter circuit of the discharge lamp lighting device between the batch DC power supply and the commercial AC power supply according to the output state of the batch DC power supply. And means;

The lighting system according to the fifth aspect of the present invention includes: a collective DC power source that outputs a DC voltage indicating a dimming level; a commercial AC power source that outputs an AC voltage; and a collective DC power source and a commercial AC power source. 5. A discharge lamp lighting device according to claim 3, which is switchably connected to the discharge lamp lighting device; a detecting means for detecting an output state of the collective DC power supply; and a power supply for an inverter circuit of the discharge lamp lighting device according to the output of the detecting means. Power source switching means for switching between a DC power source and a commercial AC power source;

According to a sixth aspect of the present invention, in the illumination system according to the fourth or fifth aspect, the dimming level of DC conversion supplied from the commercial AC power supply to the inverter circuit is lower than the minimum dimming level of the collective DC power supply. Also low; composition.

The invention according to claim 7 is the invention according to claims 4 to 6.
The lighting system according to any one of the above, wherein a plurality of collective DC power supplies and a plurality of discharge lamp lighting devices are connected to each collective DC power supply;

In the inventions according to claims 4 to 7, the collective DC power source may be any one as long as it outputs a DC voltage according to the dimming level, and for example, it may be configured as a boost chopper system.

[0015]

In the invention of claim 1, since the inverter circuit connected to the collective DC power source has a rectifying / smoothing circuit in its input portion, when the connection of the inverter circuit to the power source is switched to the commercial AC power source. However, the inverter circuit can function normally, and the discharge lamp is continuously lit at the dimming level according to the DC voltage smoothed by rectifying and smoothing the AC power from the commercial AC power supply by the rectifying / smoothing circuit. .

According to the second aspect of the present invention, since the rectifying / smoothing circuit includes a full-wave rectifying circuit, in addition to the rectifying function when connected to a commercial AC power source, it can also be connected to a collective DC power source. Even if there is a positive / negative miswiring, the positive / negative polarity does not matter.

According to the invention of claim 3, claim 1
Alternatively, since the discharge lamp lighting device described in 2 is used, the discharge lamp can be lighted without any trouble by the collective DC power supply or the commercial AC power supply.

According to the fourth aspect of the invention, basically, the inverter circuit of the discharge lamp lighting device is connected to a collective DC power source to operate, thereby dimming and lighting the discharge lamp.
When the collective DC power supply has an abnormality such as a failure, the power supply switching means switches the power supply for the inverter circuit to the commercial AC power supply side according to the output state, so that the lighting state is maintained without turning off the discharge lamp.

According to the fifth aspect of the invention, basically, the inverter circuit of the discharge lamp lighting device is connected to a collective DC power source to operate, thereby dimming and lighting the discharge lamp.
When the detection means detects that the batch DC power supply has an abnormality such as a failure, the power supply switching means switches the power supply for the inverter circuit to the commercial AC power supply side, so the discharge lamp in the system is turned on without being turned off. Is maintained.

According to the sixth aspect of the present invention, the dimming level converted to direct current supplied from the commercial AC power source to the inverter circuit is lower than the minimum dimming level of the collective DC power source.
When the collective DC power supply goes down, it becomes darker than when using the collective DC power supply, but the lighting state is maintained without turning off. Here, the minimum dimming level is, for example, 165V = 50%
The DC conversion value set by dimming and supplied from the commercial AC power supply to the inverter circuit is about 141V.

In the invention according to claim 7, since the system is configured using a plurality of collective DC power supplies and a plurality of discharge lamp lighting devices, even if any of the collective DC power supplies is down due to a failure or the like, The dimming lighting of the facility is performed while the lighting state of the discharge lamp belonging to the collective DC power supply is maintained.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. 1 is a schematic wiring diagram showing a lighting system, FIG. 2 is a block diagram showing a collective DC power source, and FIG. 3 is a circuit diagram showing individual discharge lamp lighting devices and discharge lamp lighting devices.

First, the system configuration will be described with reference to FIG. In the lighting system 1 of the present embodiment, a collective DC power supply 3 is connected to a commercial AC power supply 2, and a plurality of discharge lamp lighting devices 5a, 5b, are connected to an output line 4 of the collective DC power supply 3. 5c, ... Are sequentially connected in parallel. Here, the collective DC power supply 3 has a function of changing the value of the DC voltage supplied to each of the discharge lamps 5a, 5b, 5c, ... Via the output line 4 in accordance with the dimming level. Each of the discharge lamp lighting devices 5a, 5b, 5c, ... Is a discharge lamp lighting device 7a, 7b, 7c, ... Mainly composed of inverter circuits 6a, 6b, 6c ,. 7a, 7
Discharge lamp 8a, which is energized by b, 7c, ...
8b, 8c, ... Each of the inverter circuits 6a, 6b, 6c, ... Specifically includes a voltage detection circuit for detecting the value of the DC voltage of the output line 4 as described later, and dimming according to the value of the detected DC voltage. It has a dimming function for dimming and lighting each of the discharge lamps 8a, 8b, 8c ,.

Therefore, when the collective DC power supply 3 outputs a DC voltage corresponding to the dimming level to the output line 4, the discharge lamp lighting devices 7a, 7b, 7 connected to the output line 4 are connected.
In c, ..., The value of the DC voltage = dimming level is detected by the voltage detection circuit, and the inverter circuits 6a, 6b, 6c ,.
The discharge lamps 8a, 8b connected to the common collective DC power supply 3
8c, ... Dimming lighting is performed at the same level. For the dimming control in this case, for example, DC voltage 165V =
50% dimming (minimum dimming level) -DC voltage 220V = 1
It is executed in the range of 00% dimming (all lights).

Further, in the lighting system 1 of the present embodiment, the power source switching means 9 is interposed between the commercial AC power source 2 and the collective DC power source 3, and is connected to the output line 4 (hence, each inverter circuit). The commercial AC power supply 2 is replaced by the collective DC power supply 3 (for 6a, 6b, 6c, ...) And can be switched and connected. Further, there is provided a detection means 10 for constantly detecting the output state of the collective DC power supply 3 and switching the power supply switching means 9. As the detection means 10, for example, a voltage detection circuit that monitors the output voltage from the collective DC power supply 3 and determines that there is an abnormality such as a failure when the output voltage drops below a certain voltage is used. As the power source switching means 9, for example, a relay contact which is switched by the output of the detecting means 10 is used. Furthermore, each inverter circuit 6a,
As will be described later, 6b, 6c, ... Have a rectifying / smoothing circuit at the input stage thereof in a stage preceding the voltage detecting circuit.

In such a system configuration, the power source switching means 9 is usually in a state in which the collective DC power source 3 is connected to the commercial AC power source 2, and each of the inverter circuits 6a, 6b, 6 is connected.
c, ... Discharge lamps 7a, 7b, 7 so that the dimming level corresponds to the value of the DC voltage supplied from the collective DC power supply 3.
The lighting state of c, ... Is controlled. However, the collective DC power supply 3
When a failure or the like occurs due to some reason and an abnormality occurs in the DC voltage output through the output line 4, the detection means 10 detects this and the power supply switching means 9 performs the switching operation. That is, the collective DC power supply 3 is disconnected from the commercial AC power supply 2, and the commercial AC power supply 2 is switched to a state in which it is directly connected to the output line 4. As a result, each inverter circuit 6
The power supplies for a, 6b, 6c, ... Are switched from the collective DC power supply 3 to the commercial AC power supply 2. In the inverter circuits 6a, 6b, 6c, ..., AC voltage supplied from the commercial AC power supply 2 is rectified and smoothed by a rectifying and smoothing circuit to convert it into a direct current, and this voltage value is detected by a voltage detection circuit, thereby dimming. Converted to a level, the discharge lamp 8a,
The lighting states of 8b, 8c, ... Are controlled.

That is, even if the power source is switched to the commercial AC power source 2, the operation of maintaining the lighting of the discharge lamps 8a, 8b, 8c, ... With the inverter circuits 6a, 6b, 6c ,. Even if it goes down, this system's discharge lamp 8
All of a, 8b, 8c, ... Are never turned off. Specifically, the voltage supplied by the commercial AC power supply 2 is about 141V in DC conversion, and the minimum dimming level 165V by the collective DC power supply 3 is 50% or less,
It will be dimly lit, but never turned off. From a different point of view, when the collective DC power supply 3 is down, the collective DC power supply 3 lights up at a dimming level lower than the minimum dimming level, so that it can be distinguished from the intended dimming lighting, and the lighting state is changed. While maintaining, the user can be informed that the collective DC power supply 3 has a failure or the like.

Next, a configuration example of the collective DC power supply 3 will be described with reference to FIG. This collective DC power supply 3 is of a step-up chopper type, for example, and has a full-wave rectifier circuit 11 for full-wave rectifying the AC voltage from the commercial AC power supply 2 to DC and an output stage of the full-wave rectifier circuit 11. Connected boost chopper circuit 12
It is composed of This boost chopper circuit 12
Is composed of a step-up transformer 13, a switching transistor 14, a rectifying diode 15, and an output smoothing capacitor 16. A chopper control circuit 17 for controlling the switching operation of the transistor 14 and maintaining the voltage generated across the capacitor 16 at a constant voltage is connected to the boost chopper circuit 12 as described above. As the chopper control circuit 17, for example, a commercially available power factor improving IC called SG3561 manufactured by Silicon General Company is used. The chopper control circuit 17 is provided with a dimming signal which is set from the outside and indicates a dimming level, and the boost chopper is maintained so as to maintain a constant voltage at a value of DC voltage according to the dimming signal. It controls the operation of the circuit 12. The boost chopper circuit 1
The second output stage is connected to the output line 4.

Further, a concrete configuration example of the discharge lamp lighting device or the discharge lamp lighting device connected to the output line 4 will be described with reference to FIG. FIG. 3 shows the discharge lamp lighting device 7 or the discharge lamp lighting device 5 in an extracted manner, and the discharge lamp lighting devices 7a, 7b, 7c, ...
Or, it is commonly applied to the discharge lamp lighting devices 5a, 5b, 5c, ....

First, the input terminal 21 connected to the output line 4
Have. A discharge lamp 8 is connected between the voltage lines of the input terminal 21 via an inverter circuit 6. As the inverter circuit 6, for example, a half-bridge type high frequency inverter circuit is used. As a pair of switching elements forming the main part of the inverter circuit 6, for example, FETs Q ₁ and Q ₂ are provided. One end of the discharge lamp 8 is connected to the output line at the midpoint of connection between these FETs Q ₁ and Q ₂ via an LC resonance circuit formed by an inductive ballast L ₁ and a DC cut capacitor C ₁ . A resistor R ₁ for controlling the drain current is connected to the drain side of the FET Q ₂ . Further, the gate side of these FETs Q ₁ and Q ₂ is turned on.
A driving IC 22 for controlling the off operation is connected.
The output of the inverter circuit 6 is variable by variably controlling the oscillation frequency, and a control IC 23 that controls the operation of the drive IC 22 is provided.

On the other hand, a rectifying / smoothing circuit 24 and a voltage detecting circuit 25 for detecting the value of the DC voltage input via the rectifying / smoothing circuit 24 are connected to the power supply line of the input terminal 21. . The rectifying / smoothing circuit 24 includes a full-wave rectifying circuit 26 in which _four diodes D _{1 to} D ₄ are bridge-connected and a smoothing capacitor C ₂ . That is, the rectifying / smoothing circuit is not necessary in the inverter circuit 6 that uses the collective DC power supply 3 as a basic power supply, but when it is switched and connected to the commercial AC power supply 2 side as described above,
This rectifying / smoothing circuit 24 functions to supply the inverter circuit 6 with a voltage obtained by converting the AC voltage into a DC voltage. Also, when connecting to the collective DC power supply 3, the collective DC power supply 3 outputs a DC voltage, and the input terminal 21 has positive and negative polarities, but since the input section has the full-wave rectification circuit 24, Even if the polarity of the connection of the input terminal 21 to the collective DC power supply 3 is reversed, the current normally flows through the path of any one of the diodes D ₁ and D ₄ or the diodes D ₂ and D ₃ . That is, the protection function against erroneous wiring is secured.

The voltage detection circuit 25 is composed of resistors R _{2 to} R ₅ connected between output lines of the rectifying and smoothing circuit 24 and a capacitor connected in parallel to the resistors R ₄ and R ₅ . and C _3, a resistor R _3, R ₄ transistor Q ₃ having a base connected between, is constituted by the emitter of the transistor Q _3, a resistor R _6, R _7, which are respectively connected to the collectors. As a result, the collector current corresponding to the value of the DC voltage applied between the DC voltage lines is transferred to the transistor Q.
By flowing to ₃ , the value of this DC voltage becomes the control IC.
23, the oscillation frequency of the inverter circuit 6 is variably controlled via the driving IC 22 so that the dimming level corresponds to the value of the DC voltage. This allows
If the value of the DC voltage supplied from the collective DC power supply 3 changes, the oscillation frequency of the inverter circuit 6 is also variably controlled according to the value, and the dimming level of the discharge lamp 8 is changed. As the dimming control in this case, for example, DC voltage 165V = 50% dimming to DC voltage 220V = 100%
It is executed in the range of dimming (all lights). Further, as the dimming control when switched to the commercial AC power supply 2, for example,
The control is executed so that the dimming level equivalent to 141V is obtained.

[0033]

According to the invention described in claim 1, since the inverter circuit connected to the collective DC power source has an essentially unnecessary rectifying / smoothing circuit in its input portion, the inverter circuit is connected to the power source. The inverter circuit can function normally even when the AC power is switched to the commercial AC power supply. Therefore, even if the collective DC power supply goes down, the AC power from the commercial AC power supply is rectified by the rectification smoothing circuit. Then, the discharge lamp can continue to be lit at the dimming level according to the smoothed DC voltage.

According to the second aspect of the present invention, since the rectifying / smoothing circuit includes the full-wave rectifying circuit, in addition to the rectifying function when connected to the commercial AC power source, the rectifying / smoothing circuit is connected to the collective DC power source. Also, even if there is a positive / negative miswiring, it can be operated normally regardless of its positive / negative polarity.

According to the invention described in claim 3, since the lighting device for a discharge lamp according to claim 1 or 2 is used,
The discharge lamp can be lit without any trouble by the collective DC power supply or the commercial AC power supply, and it is possible to provide the discharge lamp lighting device capable of coping with the failure of the collective DC power supply.

According to the fourth aspect of the present invention, basically, the inverter circuit of the discharge lamp lighting device is connected to the collective DC power source to operate, and thereby the discharge lamp is dimmed and lit at a desired dimming level. However, when there is an abnormality such as a failure in the collective DC power supply, the power supply switching means switches the power supply to the inverter circuit to the commercial AC power supply side according to the output state, so even if the collective DC power supply goes down, the discharge lamp It is possible to provide a lighting system that can maintain the lighting state without turning off the light.

According to the fifth aspect of the present invention, basically, the inverter circuit of the discharge lamp lighting device is connected to the collective DC power source to operate, and thereby the discharge lamp is dimmed and lit at a desired dimming level. However, if the detection means detects that the batch DC power supply has an abnormality such as a failure, the power supply switching means switches the power supply for the inverter circuit to the commercial AC power supply side. However, it is possible to provide a lighting system that can maintain the lighting state without turning off the discharge lamp.

According to the sixth aspect of the present invention, the dimming level equivalent to DC supplied from the commercial AC power supply to the inverter circuit is set lower than the minimum dimming level of the collective DC power supply, so that the collective DC power supply goes down. In this case, it becomes darker than when using the collective DC power supply, but at least the lighting state can be maintained without turning off the light.

According to the invention as set forth in claim 7, since the system is constituted by using a plurality of collective DC power supplies and a plurality of discharge lamp lighting devices, even if any of the collective DC power supplies goes down due to a failure or the like, the batch It is possible to provide a lighting system capable of performing dimming lighting of a facility in which a lighting state of a discharge lamp belonging to a DC power source is maintained.

[Brief description of drawings]

FIG. 1 is a schematic wiring diagram showing a lighting system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a collective DC power supply.

FIG. 3 is a circuit diagram showing a discharge lamp lighting device and a discharge lamp lighting device.

[Explanation of symbols]

 2 Commercial AC power supply 3 Collective DC power supply 5 Discharge lamp lighting device 6 Inverter circuit 7 Discharge lamp lighting device 8 Discharge lamp 9 Power supply switching means 10 Detection means 24 Rectification smoothing circuit 25 Voltage detection circuit 26 Full wave rectification circuit

Claims (7)

[Claims] 1. A rectifying / smoothing circuit, and a value of a DC voltage to be supplied are detected in an input section that is switchably connected to a collective DC power source that outputs a DC voltage indicating a dimming level and a commercial AC power source. And a voltage detection circuit for controlling the discharge lamp, and an inverter circuit for dimming and lighting the discharge lamp; 2. The rectifying / smoothing circuit includes a full-wave rectifying circuit;
The lighting device for a discharge lamp according to claim 1, wherein: 3. A discharge lamp lighting device, comprising: the discharge lamp lighting device according to claim 1; and a discharge lamp that is energized by the discharge lamp lighting device. 4. A collective DC power supply which outputs a DC voltage indicating a dimming level; a commercial AC power supply which outputs an AC voltage; and a switchable connection between these collective DC power supply and commercial AC power supply. Item 3. The discharge lamp lighting device according to item 3, and power supply switching means for switching the power supply to the inverter circuit of the discharge lamp lighting device between the batch DC power supply and the commercial AC power supply according to the output state of the batch DC power supply. Lighting system. 5. A collective DC power supply that outputs a DC voltage indicating a dimming level; a commercial AC power supply that outputs an AC voltage; and a switchable connection between these collective DC power supply and commercial AC power supply. Item 3. A discharge lamp lighting device; a detecting means for detecting an output state of a collective DC power supply; a power supply for an inverter circuit of the discharge lamp lighting device is switched between the collective DC power supply and the commercial AC power supply according to the output of the detecting means. A lighting system comprising: a power source switching means; 6. The dimming level of DC conversion supplied from the commercial AC power supply to the inverter circuit is lower than the minimum dimming level of the collective DC power supply.
Illustrated lighting system. 7. The lighting system according to claim 4, wherein there are a plurality of collective DC power supplies, and a plurality of discharge lamp lighting devices are connected to each collective DC power supply.