JP2000048970A - Auxiliary lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and prevent an adverse effect on a discharge lamp by connecting an LED circuit set to be turned on at the nonexciting lamp voltage of the discharge lamp and turned off at the exciting lamp voltage of the discharge lamp in parallel with the discharge lamp. SOLUTION: The threshold voltage of an LED circuit 2 connected in parallel with a discharge lamp 1 is set higher than the exciting lamp voltage region of the discharge lamp 1 and lower than the nonexciting lamp voltage region via the selection of the number of LED elements connected in series, and the LED circuit 2 is turned on only when the discharge lamp 1 is turned off by an instantaneous power stoppage. A complicated control circuit and the addition and correction of the internal circuit of a lighting device are not required, a malfunction caused by power noises is prevented, various lighting devices can be coped with regardless of the requirement for a starting high-voltage pulse and the magnitude of the rated tube voltage, and the brightness and color of an auxiliary light source can be changed. A transformer connected in parallel with the discharge lamp 1 on the primary side and connected in parallel with the LED circuit on the secondary side is preferably provided to finely adjust the illuminance of the auxiliary illumination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary lighting device for a discharge lamp, which is provided in addition to a discharge lamp and which is turned on when the discharge lamp is not lit.

[0002]

2. Description of the Related Art Conventionally, this type of auxiliary lighting device for a discharge lamp has been disclosed in Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. -69986 has proposed. That is, the auxiliary light source is provided along with the high-pressure discharge lamp, and includes a detection unit that detects an input current to the inverter circuit or a detection unit that detects a lamp current that flows through the high-pressure discharge lamp,
When the high-pressure discharge lamp is not turned on, the input current to the inverter circuit is reduced, or the lamp current is detected by the detection means, and the auxiliary light source is controlled to be turned on.

[0003] These auxiliary lighting devices are controlled not only so that the auxiliary light source is turned on when the high-pressure discharge lamp is not turned on, but also so that high-voltage pulses when starting the high-pressure discharge lamp do not enter the auxiliary light source and the control circuit. In addition, there is an advantage that the auxiliary light source is turned on even when the luminous flux of the high-pressure discharge lamp at the beginning of lighting is low, and the luminous flux is assisted.

[0004]

However, in the auxiliary lighting device as described above, the number of components of the control circuit increases and the configuration becomes complicated, so that the auxiliary lighting device is easily affected by electromagnetic noise and may malfunction. There was a problem.

Further, since an incandescent lamp (current flows only by applying a small voltage) or the like is used as an auxiliary light source, the high-pressure discharge lamp is adversely affected while the high-pressure discharge lamp is stably operated. It was necessary to control the auxiliary light source so that no current would flow.

The present invention has been made in view of the above points, and an object of the present invention is to provide an auxiliary lighting device having a simple configuration and having no adverse effect on the discharge lamp side.

[0007]

According to the first aspect of the present invention,
An auxiliary lighting device for a discharge lamp which is provided in parallel with a discharge lamp and which is additionally turned on when the discharge lamp is not turned on, wherein the lamp is turned on when the discharge lamp has a non-lighted lamp voltage, and the lamp is turned on. An LED circuit that is set to be turned off when a voltage is reached is connected in parallel to the discharge lamp.

According to a second aspect of the present invention, in the first aspect of the invention, a transformer is provided between the discharge lamp and the LED circuit, the primary side being parallel to the discharge lamp, and the secondary side being an LED.
It is characterized by being connected in parallel to a circuit.

According to a third aspect of the present invention, in the first aspect of the present invention, a full-wave rectifier circuit is provided between the discharge lamp and the LED circuit, the primary side being parallel to the discharge lamp, and the secondary side being the secondary side. L
The ED circuit is connected in parallel.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the discharge lamp is controlled to open when the temperature of the discharge lamp is lower than a predetermined temperature and to close when the temperature of the discharge lamp is higher than the predetermined temperature. The switching element is the LE
It is characterized by being connected in series to a D circuit.

According to a fifth aspect of the present invention, in the fourth aspect, the switching element is made of a bimetal, and the bimetal is installed near the discharge lamp.

According to a sixth aspect of the present invention, in the fourth aspect of the invention, the switching element comprises a transistor connected in series to the LED circuit, a thermistor for controlling on / off of the transistor, and a resistor. A voltage dividing circuit, wherein the thermistor is installed near the discharge lamp, the transistor is turned off when the temperature of the discharge lamp is lower than a predetermined temperature, and the transistor is turned on when the temperature of the discharge lamp is higher than a predetermined temperature. It is characterized by having made it.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a schematic configuration of the auxiliary lighting device according to the first embodiment of the present invention.
In this embodiment, the LED circuit 2 is connected in parallel with the discharge lamp 1.
Is connected. The LED circuit 2 is configured by connecting LED elements in series, and the threshold voltage Vth (the forward voltage Vf at the boundary between the region where the forward current If does not flow and the region where the forward current If flows rapidly) is, as shown in FIG. The discharge lamp 1 is set to be higher than the lamp voltage range at the time of lighting and lower than the lamp voltage range at the time of non-lighting of the discharge lamp 1. This setting is L
This can be performed by selecting the number of LED elements constituting the ED circuit 2.

When the power is turned on and the discharge lamp 1 is on as shown in FIG.
Since it is lower than the threshold voltage Vth of the circuit 2, the LED circuit 2
Does not light. However, as shown in FIG. 1B, when the discharge lamp 1 goes out due to an instantaneous power failure or the like, the lamp voltage becomes higher than the threshold voltage Vth of the LED circuit 2, so that the LED circuit 2 is turned on.

According to the present embodiment, L
By connecting the ED circuit 2, the LED circuit 2 can serve as an auxiliary lighting when the discharge lamp 1 is not lit, so that a complicated control circuit is not required and the discharge lamp 1 is adversely affected. However, malfunction due to power supply noise or the like can be prevented. Also, regardless of the lighting method of the lighting device, there is no need to additionally modify the internal circuit of the lighting device, and furthermore, regardless of the necessity of the high voltage pulse for starting the discharge lamp 1 and the magnitude of the rated tube voltage, It is possible to correspond to various lighting devices simply by changing the number and the like, and realize an arbitrary brightness and an arbitrary auxiliary light source color by using an arbitrary number of LED elements or a plurality of color LED elements. You can do it.

FIG. 3 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a second embodiment of the present invention. In the present embodiment, the LED circuit 2 is configured by connecting an LED circuit 2a and an LED circuit 2b, which are configured by connecting LED elements in series, in parallel in opposite directions, and connecting the LED circuit 2 to the discharge lamp 1 in parallel. I have.

According to this embodiment, the LED circuit 2a and the LED circuit 2b are sequentially turned on for each half-wave of the voltage applied to the discharge lamp 1, so that light as auxiliary lighting increases and flickering is eliminated. effective.

FIG. 4 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a third embodiment of the present invention. In the present embodiment, the LED circuit 2 is configured by connecting a plurality of LED circuits 21 to 2n in parallel with each other, and is connected to the discharge lamp 1 in parallel.

According to this embodiment, the LED circuits 21 to 2
The illuminance of the auxiliary lighting can be adjusted by arbitrarily selecting the number n. Therefore, if the number is increased, the illuminance of the auxiliary lighting can be increased.

FIG. 5 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a fourth embodiment of the present invention. In the present embodiment, a transformer T1 or a transformer T2 is inserted between the discharge lamp 1 and the LED circuit 2. In FIG. 5A, a transformer T1 is inserted between the discharge lamp 1 and the LED circuit 2, and the number of turns of the transformer T1 on the discharge lamp 1 side (primary side) is set on the LED circuit 2 side (secondary side). More than the number of turns.
Therefore, in this case, the number of LED elements constituting the LED circuit 2 can be reduced as compared with the first embodiment. 5B, a transformer T2 is inserted between the discharge lamp 1 and the LED circuit 2, and the number of turns of the transformer T2 on the discharge lamp 1 side (primary side) is changed to the LED circuit 2 side (secondary side). ). Therefore, in this case, the LED circuit 2 is compared with that of the first embodiment.
Can be increased in number.

According to this embodiment, the transformers T1, T2
By adjusting the ratio of the number of turns of the discharge lamp 1 to the number of turns of the LED circuit 2, the number of LED elements constituting the LED circuit 2 can be arbitrarily selected, and the illuminance of the auxiliary lighting can be finely adjusted. You can do it.

FIG. 6 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a fifth embodiment of the present invention. In the present embodiment, a full-wave rectifier circuit 3 is inserted between the discharge lamp 1 and the LED circuit 2. When the discharge lamp 1 is turned on by the inverter, the LED circuit 2 is turned on by half wave in the above-described embodiment, whereas in the present embodiment, the voltage applied to the discharge lamp 1 is It is possible to turn on the full wave, thereby increasing the amount of auxiliary illumination and preventing flicker.

FIG. 7 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a sixth embodiment of the present invention. In the present embodiment, a bimetal BM is connected in series to the LED circuit 2 shown in FIG. This bimetal BM is discharge lamp 1
The contact is closed when the temperature rises.

The operation of the embodiment will be described. First, when the discharge lamp 1 is started, since the temperature of the discharge lamp 1 is low, bimetal B
The M contact is open. Therefore, in the discharge lamp started by the high voltage pulse, the high voltage pulse is not applied to the LED circuit 2 side. Next, shortly after the discharge lamp 1 is turned on, the contact of the bimetal BM is closed by the heat of the discharge lamp 1. However, since the lamp voltage is lower than the threshold voltage Vth of the LED circuit 2 during the lighting of the discharge lamp 1, LE
The D circuit 2 does not light. Here, the discharge lamp 1
When the lamp goes out, the lamp voltage rises and the LED
The circuit 2 lights up. At this time, the bimetal BM is the discharge lamp 1
The contacts are closed because the temperature of has not dropped. After a while after the discharge lamp 1 goes out and the like, the discharge lamp 1
Temperature starts to drop, and when it reaches a certain temperature, bimetal BM
Contacts open. When the contact of the bimetal BM opens, the LED circuit 2 turns off. In order for the contact of the bimetal BM to close again, the discharge lamp 1 needs to be turned on again and the temperature of the discharge lamp 1 needs to be increased. For that purpose, it is necessary to turn on the power again due to the design of the ballast for the discharge lamp. . When the power is turned on again, the above operation is repeated.

According to the present embodiment, the switching using the temperature of the discharge lamp 1 is performed with a very simple circuit configuration, so that the high-voltage pulse at the time of starting the discharge lamp 1 started with the high-voltage pulse is the LED circuit 2. Because it does not enter the side at all, L
There is no need to take measures for high voltage on the LED elements in the ED circuit 2. Thereby, the life of the LED circuit 2 can be improved.

FIG. 8 is a circuit diagram showing a schematic configuration of an auxiliary lighting device according to a seventh embodiment of the present invention. 8A, a field effect transistor Q is connected in series with the LED circuit 2 in FIG. 1, and a series circuit of the negative characteristic thermistor NTC and the resistor R is connected to one end of the negative characteristic thermistor NTC side by a low voltage (10 V). ), One end of the resistor R side is connected to the connection point between the source of the field effect transistor Q and one end of the discharge lamp 1, and the connection point between the negative characteristic thermistor NTC and the resistor R is connected to the field effect transistor Q. Connected to the gate. The negative characteristic thermistor NTC is installed near the discharge lamp 1 so that the temperature of the discharge lamp 1 can be sensed sensitively.

The operation of this embodiment will be described. When the discharge lamp 1 is started, since the temperature of the discharge lamp 1 is low, the temperature of the negative characteristic thermistor NTC is low, and the impedance of the negative characteristic thermistor NTC is high. Therefore, the voltage applied to the gate of the field effect transistor Q is lower than the threshold voltage for conducting between the drain and the source of the field effect transistor Q, so that the field effect transistor Q is turned off. At this time, as in the sixth embodiment, in the case of a discharge lamp started by a high-voltage pulse, no high-voltage pulse is applied to the LED circuit 2 side. Next, shortly after the discharge lamp 1 is turned on, the impedance of the negative characteristic thermistor NTC decreases due to the heat of the discharge lamp 1. Here, the voltage applied to the gate of the field-effect transistor Q is higher than the threshold voltage for conducting between the drain and the source of the field-effect transistor Q, so that the field-effect transistor Q is turned on. However, while the discharge lamp 1 is on, the lamp voltage is low.
Since it is lower than the threshold voltage Vth of the ED circuit 2, the LED circuit 2 does not light. Here, when the discharge lamp 1 goes out or the like due to an instantaneous power failure or the like, the lamp voltage rises and the LED circuit 2
Lights up. At this time, since the temperature of the discharge lamp 1 has not dropped, the impedance of the negative temperature coefficient thermistor NTC remains low, and the field effect transistor Q remains ON. Some time after the discharge lamp 1 has extinguished, the temperature of the discharge lamp 1 starts to decrease and the negative characteristic thermistor N
The TC impedance starts to increase, and at a certain temperature, the field effect transistor Q turns off. At this time, the LED circuit 2 is turned off. In order for the field effect transistor Q to turn on again, the discharge lamp 1 is turned on again and the discharge lamp 1 is turned on.
Must be increased, and for that purpose, it is necessary to turn on the power again due to the design of the ballast for the discharge lamp.
When the power is turned on again, the above operation is repeated.

In FIG. 8B, the negative thermistor NTC in FIG. 8A is replaced with a resistor R, and the resistor R is replaced with a positive thermistor PTC. Here, the temperature of the discharge lamp 1 and the on / off operation of the field effect transistor Q are exactly the same as those in the case of FIG.

According to the present embodiment, since the thermistor is used, the life as auxiliary lighting is further extended as compared with the sixth embodiment.

[0030]

As described above, according to the first aspect of the present invention, there is provided an auxiliary lighting device for a discharge lamp which is provided in addition to the discharge lamp and which is additionally turned on when the discharge lamp is not lit. An LE set to turn on when the discharge lamp reaches a non-lighting lamp voltage and turn off when the discharge lamp reaches a lighting lamp voltage.
Since the D circuit was connected in parallel to the discharge lamp, an auxiliary lighting device having a simple configuration and having no adverse effect on the discharge lamp side could be provided.

According to the second aspect of the present invention, in the first aspect of the present invention, a discharge lamp is provided between the discharge lamp and the LED circuit.
As the transformer was connected in parallel with the discharge lamp on the primary side and in parallel with the LED circuit on the secondary side,
By adjusting the ratio of the number of turns on the primary side and the number of turns on the secondary side of the transformer, the number of LED elements constituting the LED circuit can be arbitrarily selected, and the illuminance of the auxiliary lighting can be finely adjusted. It is.

According to the third aspect of the present invention, in the first aspect of the present invention, a discharge lamp is provided between the discharge lamp and the LED circuit.
The full-wave rectifier circuit is configured such that the primary side is connected in parallel with the discharge lamp and the secondary side is connected in parallel with the LED circuit, so that the amount of auxiliary illumination light can be increased and flicker can be prevented. .

According to the invention described in any one of claims 4 to 6, in the invention described in any one of claims 1 to 3, the discharge lamp opens when the temperature of the discharge lamp is lower than a predetermined temperature,
Since the switching element that is controlled to close when the temperature is higher than a predetermined temperature is connected in series to the LED circuit, by performing switching using the temperature of the discharge lamp with a very simple circuit configuration, The high pressure pulse at the time of starting the discharge lamp started by the high pressure pulse does not enter the LED circuit at all, and it is not necessary to take measures for the high voltage on the LED element in the LED circuit, and the life of the LED circuit can be improved. become.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram of the LED circuit according to the first embodiment;

FIG. 3 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a third embodiment of the present invention.

FIG. 5 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a fourth embodiment of the present invention.

FIG. 6 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a fifth embodiment of the present invention.

FIG. 7 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a sixth embodiment of the present invention.

FIG. 8 is a circuit diagram illustrating a schematic configuration of an auxiliary lighting device according to a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge lamp 2 LED circuit 3 Full-wave rectifier circuit T1, T2 Transformer BM Bimetal NTC Negative thermistor PTC Positive thermistor Q Field effect transistor R Resistance

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sugimoto Masaru, Kazuma, Kazuma, Osaka 1048, Matsushita Electric Works, Ltd. (72) Inventor Hideyoshi Kimura 1048, Kazuma, Kazuma, Kadoma, Osaka 72) Inventor Sumitomo Taku 1048, Kazuma Kadoma, Kadoma, Osaka Prefecture Inside the Matsushita Electric Works Co., Ltd. AA87 AA92 BA31 CJ16 CJ17 CJ19 CJ21 3K082 AA33 AA34 AA41 AA54 AA71 BA24 BD14 BE00 BE24 DA00 DA01

Claims (6)

[Claims] 1. An auxiliary lighting device for a discharge lamp which is provided in parallel with a discharge lamp and which is additionally turned on when the discharge lamp is not turned on, wherein the auxiliary lighting device is turned on when a lamp voltage when the discharge lamp is turned off is reached. An auxiliary lighting device, wherein an LED circuit set to be turned off when a lamp voltage at the time of lighting is reached is connected in parallel to the discharge lamp. 2. A transformer is provided between the discharge lamp and the LED circuit, the primary side being parallel to the discharge lamp, and the secondary side being LE.
2. The auxiliary lighting device according to claim 1, wherein the auxiliary lighting device is connected in parallel to the D circuit. 3. A full-wave rectifier circuit is connected between the discharge lamp and the LED circuit, with a primary side connected in parallel to the discharge lamp and a secondary side connected in parallel to the LED circuit. The auxiliary lighting device according to claim 1, wherein: 4. A switching element controlled to open when the temperature of the discharge lamp is lower than a predetermined temperature and close when the temperature of the discharge lamp is higher than the predetermined temperature is connected in series to the LED circuit. The auxiliary lighting device according to claim 1. 5. The auxiliary lighting device according to claim 4, wherein the switching element is made of a bimetal, and the bimetal is installed near the discharge lamp. 6. The LED according to claim 6, wherein the switching element is an LED.
A transistor configured to be connected to the circuit in series, a thermistor controlling on / off of the transistor, and a voltage dividing circuit including a resistor, the thermistor is installed near the discharge lamp, and the temperature of the discharge lamp is reduced. The auxiliary lighting device according to claim 4, wherein the transistor is turned off when the temperature is lower than a predetermined temperature, and the transistor is turned on when the temperature is higher than the predetermined temperature.