JPH10340792A - Discharge lamp dimming/lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp dimming/lighting device, wherein there is no wastage in power consumption because unnecessary current does not flow and only small-sized parts are needed to constitute a circuit for constituting a low-voltage power source from a commercial power source. SOLUTION: This discharge lamp dimming/lighting device is equipped with a high-frequency power source 3 for supplying high-frequency power to a discharge lamp, 4 a rectifying/smoothing circuit 2 for converting an output of the commercial power source 1 into a direct current voltage serving as a power source of the high-frequency power source 3, and a control part 5 for controlling the high-frequency power source by a dimming signal 7 outputted from a photocoupler 8, and a low-voltage power source 6 for the photocoupler 8 and for the control part 5 is generated from the commercial power source 1 and the high-frequency power source 3. In this case, a switching element 10 series-connected with the photocoupler 8 and a timer means 12, which is actuated just after the turning-on of the commercial power source 1 and closes the switching element 10 when a required period of time from the turning-on of the commercial power source 1 until the start of the high-frequency power source 3 has elapsed, are provided and a current is adapted so as to flow in the photocoupler 8, only when the switching element 10 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp dimming and lighting device suitable for dimming and lighting a discharge lamp with a low luminous flux.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a configuration of a conventional discharge lamp dimming lighting device. In the figure, 1 is a commercial power supply, 2 is a rectifying and smoothing circuit for converting the output of the commercial power supply 1 into a DC voltage,
Reference numeral 3 denotes a high-frequency power supply that outputs high-frequency power using a DC voltage from a rectifying and smoothing circuit as a power supply, and 4 denotes a load circuit having a discharge lamp. Reference numeral 5 denotes a control unit that controls the high-frequency power supply 3 based on a dimming signal 7 input from the outside, and 6 denotes a low-voltage power supply generated by the commercial power supply 1 and the high-frequency power supply 3. Reference numeral 8 denotes a photocoupler that includes a light emitting diode and a phototransistor and outputs a dimming signal to the control unit 5.
The resistance connected to the phototransistor, which is the output side of
Reference numeral 17 denotes a switch provided between the high-frequency power supply 3 and the phototransistor of the photocoupler 8. The low-voltage power supply 6 functions as a power supply for the photocoupler 8 and a power supply for the control unit 5.

[0005] Next, the operation of the prior art configured as described above will be described. When the commercial power supply 1 is turned on, the commercial power supply 1
And a low voltage power supply 6 is generated. After a predetermined time delay (about one second) after the commercial power supply 1 is turned on, the high-frequency power supply 3 is turned on. When the high-frequency power supply 3 is turned on, the switch 17 is closed, and the control power supply of the high-frequency power supply 3 is also used as the low-voltage power supply 6. After the high-frequency power supply 3 is turned on, the high-frequency power supply 3 supplies a high-frequency current to the load circuit 4 based on an instruction from the control unit 5. Further, the control unit 5 controls the high-frequency power supply 3 based on a dimming signal corresponding to the current value flowing through the phototransistor of the photocoupler 8 to change the output light flux of the load circuit 4.

[0004]

In the conventional discharge lamp dimming lighting device as described above, since the output side phototransistor of the photocoupler 8 is directly connected to GND via the resistor 9, it is shown in FIG. As described above, when the commercial power supply 1 is turned on, even if the high frequency power supply 3 is not turned on, if the photodiode on the input side of the photocoupler 8 is turned on, the current from the low voltage power supply 6 is supplied to the output side phototransistor. The light control signal is output. However, the dimming signal is a signal necessary for controlling the high frequency power supply 3 and is not necessary before the high frequency power supply 3 is turned on. Therefore, it is wasteful that a current flows before the high-frequency power supply 3 is turned on, and there is a problem that the above-described conventional technology consumes unnecessary power.

The low-voltage power supply 6 is used as a power supply for the control unit 5 in addition to supplying a current for a dimming signal. Therefore, the low-voltage power supply 6 is required to have a capacity necessary to flow both a current for a dimming signal and a role as a drive power supply for the control unit 5. By the way, there is a certain time delay between turning on the commercial power supply 1 and turning on the high-frequency power supply 3, and during this time, the low-voltage power supply 6 is generated only from the commercial power supply 1. Therefore, as the capacity of the low-voltage power supply 6 generated from the commercial power supply 1, the low-voltage power supply 6 allows the current for the dimming signal to flow and the control unit 5
Therefore, a capacity required to fulfill both the role as a driving power source and the driving power source is required. For this reason, components constituting a circuit for producing the low-voltage power supply 6 from the commercial power supply 1,
For example, there has been a problem that the voltage dividing resistor and the like become large, the cost increases, and a large installation space is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, so that unnecessary current does not flow, power consumption is not wasted, and components constituting a circuit for producing a low-voltage power supply from a commercial power supply are small. It is an object of the present invention to obtain a discharge lamp dimming lighting device that can be used.

[0007]

A discharge lamp dimming lighting device according to the present invention converts a high-frequency power supply for supplying high-frequency power to a discharge lamp and an output of a commercial power supply to a DC voltage which is a power supply of the high-frequency power supply. A rectifying / smoothing circuit; and a control unit for controlling a high-frequency power supply based on a dimming signal output from the photocoupler, and generating a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply. A switching element connected in series with the photocoupler, the switching element is configured to be closed at the same time as or immediately after the start of the high-frequency power supply, and the photocoupler is closed only when the switching element is closed. The current is made to flow.

A high-frequency power supply for supplying high-frequency power to the discharge lamp, a rectifying / smoothing circuit for converting the output of the commercial power supply to a DC voltage which is a power supply of the high-frequency power supply, and a high-frequency A control unit for controlling a power supply, in a discharge lamp dimming lighting device that generates a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply, and is connected in series with the photocoupler. A switching element, and timer means for operating immediately after the commercial power supply is turned on and closing the switching element when a time required from the application of the commercial power supply to the activation of the high-frequency power supply elapses, and the switching element is closed. Only when the current flows through the photocoupler.

A high-frequency power supply for supplying high-frequency power to the discharge lamp, a rectifying / smoothing circuit for converting the output of the commercial power supply to a DC voltage which is a power supply for the high-frequency power supply, and a high-frequency A control unit for controlling a power supply, in a discharge lamp dimming lighting device that generates a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply, and is connected in series with the photocoupler. A switching element, wherein the control unit has a function of closing the switching element when detecting that the high-frequency power supply is started, and a current flows through the photocoupler only when the switching element is closed. It is.

Further, the control unit closes the switching element when detecting that the preheating of the discharge lamp has ended, instead of detecting the start of the high-frequency power supply.

Further, the control unit closes the switching element when detecting that the discharge of the discharge lamp has started, instead of detecting the start of the high-frequency power supply.

Further, a DC-DC converter having a built-in rectifying / smoothing circuit is used in place of the rectifying / smoothing circuit, and the control unit is configured to detect when the DC-DC converter is started instead of detecting the start of the high frequency power supply. In this case, the switching element is closed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram showing Embodiment 1 of the present invention. In FIG. 1, 1 is a commercial power supply, 2 is a rectifying and smoothing circuit for converting the output of the commercial power supply 1 into a DC voltage, 3
Reference numeral 4 denotes a high-frequency power supply that outputs high-frequency power using a DC voltage from a rectifying and smoothing circuit as a power supply, and 4 denotes a load circuit having a discharge lamp. Reference numeral 5 denotes a control unit that controls the high-frequency power supply 3 based on a dimming signal 7 input from the outside, and 6 denotes a low-voltage power supply generated by the commercial power supply 1 and the high-frequency power supply 3. Reference numeral 8 denotes a photocoupler that includes a light emitting diode and a phototransistor, and outputs a dimming signal 7 to the control unit 5;
The resistance connected to the phototransistor, which is the output side of
Reference numeral 17 denotes a switch provided between the high-frequency power supply 3 and the phototransistor of the photocoupler 8. The above configuration is the same as that of the related art shown in FIG.

Reference numeral 10 denotes a switching element provided between the resistor 9 and GND, which is open before the commercial power supply 1 is turned on. Reference numeral 12 denotes a timer circuit which is activated by an output of the control unit 5 and outputs a signal for closing the switching element 10 when a predetermined time elapses. The predetermined time set by the timer circuit 12 is a time required from when the commercial power supply 1 is turned on to when the high-frequency power supply 3 is turned on.

The operation of the present embodiment configured as described above will be described. When the commercial power supply 1 is turned on, the control unit 5 outputs to the timer circuit 12 a power-on signal 11 which is a signal indicating that the commercial power supply 1 is turned on. When the power-on signal 11 is input, the timer circuit 12 starts counting time. When the commercial power supply 1 is turned on, a low-voltage power supply 6 is generated by the commercial power supply 1 and supplied as a power supply for the control unit 5. In this state, even if the photodiode of the photocoupler 8 emits light, no current flows through the resistor 9 because the switching element 10 is open and the resistor 9 is not connected to GND.

When a predetermined time elapses after the commercial power supply 1 becomes 0 N, the high-frequency power supply 3 is turned on and the switch 17 is closed, and a part of the control power supply of the high-frequency power supply 3 is used as the low-voltage power supply 6. When a predetermined time has elapsed after the commercial power supply 1 has turned ON, a signal indicating that the switch should be closed is output from the timer circuit 12 to the switching element 10, and the switching element 10 is closed. Switching element 10
Is closed in the same manner as in the conventional example.
Current flows through the phototransistor according to the light emission of the photo diode, whereby the dimming signal 7 is input to the control unit 5, and the output luminous flux of the load circuit 4 is changed according to the signal intensity of the dimming signal 7. Change.

As described above, according to the present embodiment, as shown in FIG. 2, after the commercial power supply 1 is turned ON and the high-frequency power supply 3 is turned on, the photocoupler 8 is turned on during this time. Even if the diode emits light, no current flows through the resistor 9, so that unnecessary power consumption is prevented. The low-voltage power supply 6 generated from the commercial power supply 1 is
Any power source may be used as long as it is necessary to activate the control unit 5 before the power source is activated, and the components constituting the circuit for generating the low-voltage power source 6 from the commercial power source 1 can be reduced in size, which leads to cost reduction and Space saving can be realized.

Embodiment 2 FIG. FIG. 3 is a block diagram showing a third embodiment of the present invention, in which 1 to 10 are exactly the same as those in the first embodiment. In the second embodiment, the control unit 5 detects that the high-frequency power supply 3 has been turned on, and outputs this to the switching element 10 as a high-frequency power supply start signal 14. It is designed to close when input.

As a result, as shown in FIG. 4, the dimming signal 7 is not output unless the high frequency power supply start signal 14 is turned on after the commercial power supply 1 is turned on. Unnecessary power consumption is prevented,
The components constituting the circuit for generating the low-voltage power supply 6 from the commercial power supply 1 can be reduced in size, and cost reduction and space saving can be realized. Further, in the case of the present embodiment, the timer circuit 12 is unnecessary as compared with the first embodiment, so that the configuration is simplified and the cost can be reduced.

Embodiment 3 FIG. 5 is a block diagram showing a third embodiment of the present invention, in which 1 to 10 are exactly the same as those in the first embodiment. In the third embodiment, the control unit 5 detects that the preheating of the discharge lamp in the load circuit 4 has ended, and outputs this to the switching element 10 as the preheating end signal 15, and the switching element 10 outputs the preheating end signal. It is designed to close when 15 is input.

As a result, as shown in FIG. 6, the dimming signal 7 is not output until after the commercial power supply 1 is turned on and after the preheating end signal 15 is turned on. Power consumption can be prevented, and the components constituting the circuit that generates the low-voltage power supply 6 from the commercial power supply 1 can be reduced in size, thereby realizing cost reduction and space saving. Further, in the case of the present embodiment, the timer circuit 12 is unnecessary as compared with the first embodiment, so that the configuration is simplified and the cost can be reduced.

Embodiment 4 FIG. 7 is a block diagram showing a fourth embodiment of the present invention. In the drawing, reference numerals 1 to 10 are exactly the same as those in the first embodiment. In the fourth embodiment, the control unit 5 detects that the discharge is started by the discharge lamp in the load circuit 4 and outputs this to the switching element 10 as a discharge detection signal 16.
Is configured to close when the discharge detection signal 16 is input.

As a result, as shown in FIG. 8, the dimming signal 7 is not output until after the commercial power supply 1 is turned on and the discharge detection signal 16 is turned on. Power consumption can be prevented, and the components constituting the circuit that generates the low-voltage power supply 6 from the commercial power supply 1 can be reduced in size, thereby realizing cost reduction and space saving. Further, in the case of the present embodiment, the timer circuit 12 is unnecessary as compared with the first embodiment, so that the configuration is simplified and the cost can be reduced.

Embodiment 5 FIG. 9 is a block diagram showing a fourth embodiment of the present invention. In the figure, 1, 3 to 10 are exactly the same as those in the first embodiment. In the fifth embodiment, a DC-DC converter 18 having a built-in rectifying / smoothing circuit is used instead of the rectifying / smoothing circuit 2 in the first embodiment, and the control unit 5 activates the DC-DC converter 18. When the DC-DC converter start signal is output, the DC-DC converter start signal 13 is also output to the switching element 10, and the switching element 10
When the C-DC converter activation signal 13 is input, the C-DC converter is closed.

As a result, as shown in FIG. 10, after the commercial power supply 1 is turned on, the DC-DC converter start signal 1 is turned on.
Since the dimming signal 7 is not output unless the switch 3 is turned on, unnecessary power consumption is prevented and a circuit for generating the low-voltage power supply 6 from the commercial power supply 1 is configured as in the first embodiment. Components can be reduced in size, and cost reduction and space saving can be realized. Further, in the case of the present embodiment, compared to the first embodiment,
Is unnecessary, the configuration is simplified and the cost can be reduced.

[0026]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, a switching element connected in series with the photocoupler is provided, and the switching element is configured to be closed at the same time as or immediately after the start of the high-frequency power supply, and the switching element is closed. Current flows through the photocoupler only when the power supply is turned on, so that no current flows through the photocoupler until the high-frequency power supply is turned on after the commercial power supply is turned ON.
Unnecessary power consumption is prevented. The low-voltage power supply generated from the commercial power supply may be any power supply necessary to start the control unit before the high-frequency power supply starts, and a circuit that generates the low-voltage power supply from the commercial power supply is a component. Can be reduced in size, and cost reduction and space saving can be realized.

According to the second aspect of the present invention, the switching element connected in series with the photocoupler operates immediately after the commercial power supply is turned on, and the time required from the supply of the commercial power supply to the activation of the high-frequency power supply elapses. And a timer means for closing the switching element when the switching element is closed so that the current flows through the photocoupler only when the switching element is closed.

Further, according to the invention of claim 3, there is provided a switching element connected in series with the photocoupler, and the control unit has a function of closing the switching element when detecting that the high-frequency power supply has been started. Since the current flows to the photocoupler only when the switching element is closed, in addition to the effect of the invention according to claim 2, there is no need to provide a timer means, so that the configuration is simplified and the cost can be reduced. To play.

In the invention of claim 4, the control unit closes the switching element when detecting that the preheating of the discharge lamp has ended instead of detecting the start of the high-frequency power supply. In addition to the effects of the second aspect of the invention, there is an effect that the configuration can be simplified and the cost can be reduced because no timer means is required.

Further, in the invention of claim 5, the control unit closes the switching element when detecting that the discharge of the discharge lamp has started, instead of detecting the start of the high-frequency power supply. In addition to the effects of the second aspect of the invention, there is an effect that the configuration can be simplified and the cost can be reduced because no timer means is required.

Further, in the invention of claim 6, a DC-DC converter having a built-in rectifying / smoothing circuit is used instead of the rectifying / smoothing circuit, and the control unit replaces the detection of activation of the high frequency power supply with the DC-DC converter. Since the switching element is closed when the converter is started, in addition to the effect of the second aspect of the invention, there is no need to provide a timer means, so that the structure is simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a discharge lamp dimming lighting device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an output timing of a dimming signal according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a discharge lamp dimming lighting device according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of an output timing of a dimming signal according to the second embodiment of the present invention.

FIG. 5 is a block diagram of a discharge lamp dimming lighting device according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of an output timing of a dimming signal according to the third embodiment of the present invention.

FIG. 7 is a block diagram of a discharge lamp dimming lighting device according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of an output timing of a dimming signal according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram of a discharge lamp dimming lighting device according to a fifth embodiment of the present invention.

FIG. 10 is an explanatory diagram of an output timing of a dimming signal according to the fifth embodiment of the present invention.

FIG. 11 is a block diagram of a conventional discharge lamp dimming lighting device.

FIG. 12 is an explanatory diagram of a dimming signal output timing in a conventional example.

[Explanation of symbols]

1 Commercial power supply, 2 Rectifier smoothing circuit, 3 High frequency power supply, 4
Load circuit, 5 control unit, 6 low-voltage power supply, 7 dimming signal, 8 photocoupler, 9 resistor, 10 switching element, 11 power-on signal, 12 timer circuit, 13
DC-DC converter start signal, 14 high frequency power supply start signal, 15 preheating end signal, 16 discharge detection signal, 1
7 switches, 18 DC-DC converters.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichiro Nishi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Kentaro Eguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 Ryo Denki Co., Ltd. (72) Inventor Takehisa Hamaguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Kazutaka Shimizu 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Rishi Electric Co., Ltd. (72) Inventor Tetsuya Kobayashi 5-1-1, Ofuna, Kamakura City, Kanagawa Prefecture Inside Mitsubishi Electric Lighting Co., Ltd.

Claims (6)

[Claims] 1. A high-frequency power supply for supplying high-frequency power to a discharge lamp, a rectifying and smoothing circuit for converting an output of a commercial power supply into a DC voltage which is a power supply of the high-frequency power supply, and a high-frequency A control unit for controlling a power supply, a discharge lamp dimming lighting device that generates a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply, and is connected in series with the photocoupler. A switching element is provided, the switching element is configured to be closed at the same time as or immediately after the activation of the high-frequency power supply, and a current flows through the photocoupler only when the switching element is closed. Discharge lamp dimming lighting device. 2. A high-frequency power supply for supplying high-frequency power to a discharge lamp, a rectifying / smoothing circuit for converting an output of a commercial power supply to a DC voltage which is a power supply of the high-frequency power supply, and a high-frequency A control unit for controlling a power supply, a discharge lamp dimming lighting device that generates a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply, and is connected in series with the photocoupler. A switching element, and timer means for operating immediately after the commercial power supply is turned on and closing the switching element when a time required from the application of the commercial power supply to the activation of the high-frequency power supply elapses, and the switching element is closed. A dimming and lighting device for a discharge lamp, wherein a current flows through the photocoupler only when the light is turned on. 3. A high-frequency power supply for supplying high-frequency power to a discharge lamp, a rectifying / smoothing circuit for converting an output of a commercial power supply into a DC voltage which is a power supply for the high-frequency power supply, and a high-frequency A control unit for controlling a power supply, a discharge lamp dimming lighting device that generates a low-voltage power supply for the photocoupler and the control unit from the commercial power supply and the high-frequency power supply, and is connected in series with the photocoupler. A switching element, wherein the control unit has a function of closing the switching element when detecting that the high-frequency power supply has been started, and a current flows to the photocoupler only when the switching element is closed. Discharge lamp dimming lighting device characterized by the above-mentioned. 4. The control unit according to claim 3, wherein the control unit closes the switching element when detecting that the preheating of the discharge lamp has ended, instead of detecting the start of the high-frequency power supply. The dimming lighting device for a discharge lamp as described in the above. 5. The control unit according to claim 3, wherein the control unit closes the switching element when detecting that the discharge of the discharge lamp has started, instead of detecting the start of the high-frequency power supply. The dimming lighting device for a discharge lamp as described in the above. 6. A DC-DC converter having a built-in rectifying / smoothing circuit is used in place of the rectifying / smoothing circuit, and the control unit is configured to start the DC-DC converter instead of detecting the start of the high-frequency power supply. 4. The dimming and lighting device for a discharge lamp according to claim 3, wherein the switching element is closed.