JP5299722B2 - LED lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a light emitting diode to be lit, with phase-controlled voltage, such that light intensity is adjustable like a bulb. <P>SOLUTION: The output voltage of a phase control circuit 12 is fed to a DC power supply 15 and an striking phase detecting circuit 16. The DC power supply 15 smoothes the voltage that is phase-controlled by the phase control circuit 12 to obtain DC power having constant voltage, and the output of the DC power supply is fed to a switching circuit 17. Meanwhile, the striking phase detecting circuit 16 detects the striking phase of the voltage that is phase-controlled by the phase control circuit 12 to output the detection result to a control operation portion 18 to change the output of the switching circuit 17. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an LED lighting device that dimmes a light-emitting diode with a phase control voltage obtained by phase-controlling an AC voltage.

  For example, in a stage or studio lighting device, dimming lighting is performed to enhance the effect of production, and a light bulb such as an incandescent lamp or a halogen lamp is used as a light source. In order to change the electric power supplied to the light bulb according to the dimming level, a pair of thyristors connected in reverse parallel are provided on the AC power supply line for the light bulb, and the ignition corresponding to the dimming level is performed every half cycle of the AC power supply. Phase control is performed to make these thyristors conduct at a phase angle (see, for example, Patent Document 1).

In recent years, the development of light emitting diodes (LEDs) has been remarkable, and the efficiency is equivalent to that of a light bulb, and light emitting diodes are used as light sources because they can prevent color misregistration at low gradations, reduce heat generation, and extend life. It is attracting attention.
Japanese Patent No. 3402653 (FIG. 5)

  However, on the user side, it is desirable to use an LED by replacing only the light source unit, and there is a desire to avoid reviewing the entire system.

  Moreover, since the LED and the light bulb have different light output characteristics with respect to the dimming degree by the same dimming signal, the light output when the power source is phase-controlled by the dimming signal for the light bulb and the phase control of the LED by the same dimming signal are performed. In some cases, the light output may be different.

  An object of the present invention is to provide an LED illumination device capable of dimming a light emitting diode like a light bulb with a phase-controlled voltage.

The invention according to claim 1 is an LED light source unit; a DC power supply unit which is supplied with a phase control voltage from a phase control circuit capable of continuously phase-controlling commercial AC voltage and converts the phase control voltage into a rectified and smoothed DC voltage A switching circuit that is supplied with the output of the DC power supply unit and can control the power supplied to the LED light source unit ; a firing phase detection circuit that detects the firing phase from the phase control voltage ; and detection of the firing phase detection circuit The output of the switching circuit is changed according to the signal, and the output of the switching circuit is controlled so that the light output change amount of the LED light source unit with respect to the power change amount becomes smaller in the low level lighting region than in other regions. And a control operation unit .

The invention according to claim 2 is an LED light source unit; a DC power source unit which is supplied with a phase control voltage from a phase control circuit capable of continuously phase-controlling a commercial AC voltage and converts the phase control voltage into a rectified and smoothed DC voltage A switching circuit that is supplied with the output of the DC power supply unit and can control the power supplied to the LED light source unit; a voltage detection circuit that detects the voltage value of the DC power supply unit; and according to a detection signal of the voltage detection circuit A control operation unit that changes the output of the switching circuit and controls the output of the switching circuit so that the light output change amount of the LED light source unit with respect to the power change amount is smaller in the low-level lighting region than in other regions; It is characterized by comprising ;

  In the embodiment of the present invention, the light emitting diode of the LED light source unit may be a white LED or a colored LED.

  In the embodiment of the present invention, it is possible to provide a dimming control circuit that performs dimming control according to the phase control voltage so that the light output change of the light emitting diode approximates the light output change of the bulb. For example, the light output characteristic curve of the light emitting diode and the light output characteristic curve of the light bulb are stored in advance, and the light control of the light emitting diode is controlled by the light output characteristic of the light bulb with respect to the phase control voltage for the light bulb.

  Further, in the embodiment of the present invention, the light control circuit is configured such that when the electric power supplied after being phase-controlled becomes equal to or greater than a predetermined value, the light output characteristic curve of the bulb starts from a gradation corresponding to the predetermined value. Accordingly, the light emitting diode can be configured to be dimmed. The dimming control circuit starts its operation when the power supplied from the power source becomes a predetermined value or more. This is to prevent malfunction of the dimming control circuit, and to prevent this from happening when the power supplied from the power source is less than a predetermined value, the dimming control circuit may not operate normally. .

  Dimming and lighting a light emitting diode according to the light output characteristic curve of the bulb starting from the gradation corresponding to the predetermined value means that the light emitting diode starts from the gradation of the bulb at the power value when the dimming control circuit starts operating. Is dimmed, and then the light emitting diode is dimmed according to the light output characteristic curve of an existing light bulb. As a result, the light emitting diode is not lit at the time of low gradation before the operation of the dimming control circuit, but after the light emitting diode is lit, the light emitting diode can be dimmed with the light output characteristics of the bulb.

  In the embodiment of the present invention, the dimming control circuit may be configured such that when the electric power supplied by phase control becomes equal to or higher than a predetermined value, the predetermined value is set to 0 gradation and the 0 gradation is set as a starting point. The light emitting diode can be dimmed and lit at a dimming ratio determined by the light output characteristic curve.

  Dimming and lighting the light emitting diode with the dimming ratio determined by the light output characteristic curve of the light bulb with the predetermined value as 0 gradation and the 0 gradation as the starting point is the gradation when the dimming control circuit starts operation. As the 0th gradation, the light emitting diode is dimmed and lit at the dimming ratio determined by the light output characteristic curve of the bulb, starting from the 0th gradation. Thereby, it is possible to continuously perform dimming control of the light emitting diode from 0 gradation to 256 gradations with characteristics approximate to the light output characteristics of the bulb.

  In addition, the embodiment of the present invention includes an LED illumination device, a bulb illumination device including a light bulb as a light source, and a dimming operation for dimming and lighting the LED illumination device and the bulb illumination device with the same phase control voltage. And a table. Even in an illumination system in which an LED illumination device including a light emitting diode as a light source and a light bulb illumination device including a light bulb as a light source are mixed, the light output of the light emitting diode approximates the light output of the light bulb. Thus, by providing the dimming control circuit for dimming and lighting the light emitting diode, the LED lighting device and the bulb lighting device can be dimmed and lighted with the same phase control voltage and light output characteristics approximate to each other.

  According to the first and second aspects of the present invention, the light emitting diode can be continuously dimmed and lighted like a light bulb by a phase-controlled voltage.

The block block diagram of an example of the LED lighting apparatus which is a reference example of this invention. The block block diagram of the LED lighting apparatus for demonstrating the usage example of one Embodiment of this invention. The block block diagram which shows the 1st Embodiment of this invention. Explanatory drawing of the light output characteristic curve of a light bulb, and the light output characteristic curve of a light emitting diode. FIG. 6 is an operation explanatory diagram of a dimming control circuit according to an embodiment of the present invention. The block block diagram which shows the 2nd Embodiment of this invention. The block block diagram which shows an example of the light control circuit when the electric power from the power supply which is not phase-controlled in the LED lighting apparatus of FIG. 2 is input into a light control circuit. The block block diagram which shows another example of the light control circuit when the electric power from the power supply which is not phase-controlled in the LED lighting apparatus of FIG. 2 is input into a light control circuit.

  FIG. 1 is a block diagram illustrating a reference example of an LED lighting device. The LED light source unit 11 is composed of a plurality of light emitting diodes. The LED light source unit 11 is supplied with power for turning on the light emitting diode of the LED light source unit 11 from the power source 10. The power source 10 is, for example, a commercial AC power source.

  The dimming control circuit 14 dims and lights the light emitting diode so that the light output of the light emitting diode approximates the light output of the bulb, and the LED light source based on the dimming signal input to the dimming control circuit 14 The light-emitting diode of the unit 11 is dimmed and controlled. The dimming control circuit 14 stores in advance a light output characteristic curve of the light emitting diode and a light output characteristic curve of the light bulb, and dimming control of the light emitting diode with the light output characteristic of the light bulb with respect to the dimming signal for the light bulb. To do. The light control signal for the light bulb is a light control signal corresponding to the light output characteristics of the light bulb as a light source.

  FIG. 2 is a block diagram of an LED lighting device for explaining an example of use of one embodiment of the present invention. In contrast to the example shown in FIG. 1, the phase control circuit 12 that supplies phase-controlled power by phase-controlling the alternating current from the power supply 10, and the power supply 10 directly when the power from the phase control circuit 12 is input. Is additionally provided with switching means 23 for switching between the case where power is input from.

  The phase control circuit 12 supplies the phase-controlled power by phase-controlling the alternating current from the power supply 10. For example, the AC voltage from the power supply 10 is phase-controlled based on a dimming signal for a light bulb from a fader of the dimming console 13. Accordingly, the output of the phase control circuit 12 becomes electric power whose phase is controlled based on the dimming signal for the light bulb. Here, the light control signal for the light bulb is a light control signal corresponding to the light output characteristics of the light bulb as a light source, and is input from, for example, a fader of a light control console. The light bulb includes various light bulbs such as an incandescent lamp and a halogen lamp.

  The switching means 23 inputs the power phase-controlled by the phase control circuit 12 to the dimming control circuit 14 and performs dimming control with the phase-controlled power, and directly from the power supply 10 to the dimming control circuit 14. Switch between the case where power is input and the dimming control is performed by another dimming signal.

  The dimming control circuit 14 performs dimming lighting of the light emitting diode so that the light output of the light emitting diode approximates the light output of the bulb, and the power or phase phase-controlled by the phase control circuit 12 based on the dimming signal. Electric power from an uncontrolled power source 10 is input, and the light emitting diode of the LED light source unit 11 is dimmed and controlled with the light output characteristics of the bulb.

  Hereinafter, when the power controlled in phase by the phase control circuit 12 is input to the dimming control circuit 14 (one embodiment of the present invention), the power from the power source 10 that is not phase-controlled is directly dimmed. The case where it is input to the circuit 14 will be described separately.

  First, the case where the electric power phase-controlled by the phase control circuit 12 according to an embodiment of the present invention is input to the dimming control circuit 14 will be described with reference to FIG. FIG. 3 is a block diagram showing an embodiment of the present invention. The output voltage of the phase control circuit 12 is input to the DC power supply unit 15 that outputs, for example, a constant DC voltage of the dimming control circuit 14 and the ignition phase detection circuit 16. In this embodiment, the DC power supply unit 15 obtains a constant voltage DC power supply by smoothing the voltage phase-controlled by the phase control circuit 12, and its output is input to the switching circuit 17.

On the other hand, the ignition phase detection circuit 16 detects the ignition phase of the voltage phase-controlled by the phase control circuit 12 and outputs it to the control calculation unit 18. Based on the ignition phase detected by the ignition phase detection circuit 16, the control calculation unit 18 changes the output of the switching circuit 17 according to the ignition phase, and as shown in FIG. In the region where the output is small), the output of the switching circuit 17 is changed so that the amount of change in the optical output relative to the amount of change in power is smaller than in other regions. Further, in the present embodiment, it is determined whether or not the power from the phase control circuit 12 has become a predetermined value or more. That is, when the electric power from the phase control circuit 12 becomes equal to or higher than a predetermined value, a control calculation is started, a command is output to the switching circuit 17, and the light emitting diode of the LED light source unit 11 is dimmed and controlled by PWM control. Here, the reason why the operation is started when the power supplied from the phase control circuit 12 exceeds a predetermined value is to prevent malfunction of the dimming control circuit 14.

  The LED light source unit 11 includes a plurality of light emitting diodes. For example, group A LEDs are main white LEDs, and group B LEDs are correction LEDs, and correct color temperature and color rendering.

The storage unit 19 of the control calculation unit 18 stores in advance a light output characteristic curve C1 of the light bulb and a light output characteristic curve C2 of the light emitting diode as shown in FIG. Then, based on the light output characteristic curve C1 of the light bulb and the light output characteristic curve C2 of the light emitting diode, dimming control is performed on the light emitting diode with the light output characteristic of the light bulb with respect to the phase control power for the light bulb. That is, as described above, dimming control is performed so that the light output with respect to the amount of power change is smaller in the region where the light output is small than in the region where the light output is large. For example, when the power from the phase control circuit 12 is P1, if the light emitting diode is turned on as it is, the light output becomes L12, which is not the gradation intended by the operator, and thus the light output L11 determined by the light output characteristic curve C1 of the bulb. And Similarly, when the power from the phase control circuit 12 is P2, the light output L21 is determined by the light output characteristic curve C1 of the bulb. Thereby, since the light emitting diode can be dimmed and controlled by the dimming signal (phase control power) for the light bulb, the existing lighting device can be used with the conventional operation feeling even if the light source unit is replaced with the LED light source unit 11.

  Here, since the dimming control circuit 14 starts the operation of the dimming control circuit when the power supplied from the phase control circuit becomes equal to or higher than a predetermined value, the dimming control circuit 14 is supplied from the phase control circuit 12. The light emitting diode as the light source is turned off at the time of low gradation when the power to be output is less than a predetermined value. Therefore, when the dimming control is performed so that the light output of the light emitting diode approximates the light output of the light bulb according to the dimming signal to the light bulb, the light emitting diode is dimmed taking into account the period during which the light emitting diode is off. Control.

  FIG. 5 is an operation explanatory diagram of the dimming control circuit 14. In FIG. 5, it is assumed that the power at which the dimming control circuit 14 can stably operate is in the region of P0 or more. In this case, since the dimming control circuit 14 does not operate in the range T where the power input from the phase control circuit 12 to the dimming control circuit 14 is 0 to P0, the light emitting diode of the LED light source unit 11 remains off. A characteristic curve C11 is a dimming operation of the light emitting diode starting from the gradation (light output L01) of the light bulb at the power value P0 when the dimming control circuit starts to operate, and thereafter the light output characteristic curve of the existing light bulb. The case where the light emitting diode is dimmed is shown. That is, the characteristic curve C11 is a light output characteristic curve of an existing light bulb. In this case, the dimming control can be performed according to the light output characteristic curve of the existing bulb when the input power is P0 or more, but the dimming control cannot be performed when the input power is a low gradation less than P0.

Therefore, as shown by the characteristic curve C12, the gradation when the dimming control circuit 14 starts operation is set to 0 gradation, and light emission is performed at the dimming ratio determined by the light output characteristic curve of the bulb starting from the 0 gradation. Dimming the diode. In this case, the light output characteristic curve of the light bulb itself is not the characteristic curve approximated to the light output characteristic of the light bulb, but the light-emitting diode can be continuously dimmed from 0 gradation to 256 gradations. The dimming control of the light emitting diode is performed by selecting either the characteristic curve C11 or the characteristic curve C12. In any of the characteristic curves C11 and C12, the light output change amount with respect to the power change amount is smaller in the low-level lighting region than in the other regions.

  FIG. 6 is a block diagram showing a second embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 3 in that a voltage detection circuit 20 is provided instead of the ignition phase detection circuit 16. The same elements as those in FIG. 3 are denoted by the same reference numerals and redundant description is omitted, but the output of the switching circuit 17 is changed via the control calculation unit 18 according to the detection value of the voltage detection circuit to adjust the light emitting diode. The light control is the same as in FIG. In the dimming control circuit 14 of FIG. 3, it is determined whether or not the power from the phase control circuit 12 has become a predetermined value or more based on the ignition phase of the voltage detected by the ignition phase detection circuit 16. However, in the dimming control circuit 14 of FIG. 6, the electric power from the phase control circuit 12 becomes equal to or higher than a predetermined value depending on whether or not the voltage of the constant voltage DC power supply unit 15 becomes equal to or higher than a predetermined value by the voltage detection circuit 20. It is determined whether or not.

  Next, in the LED lighting device of FIG. 2, a case where power from the power supply 10 that is not phase-controlled is directly input to the dimming control circuit 14 will be described. FIG. 7 is a block diagram showing an example of the dimming control circuit 14 in that case. The dimming control circuit 14 shown in FIG. 3 is provided with a dimming volume 21 for removing the ignition phase detection circuit 16 and inputting a dimming signal to the light emitting diode based on the dimming signal for the light bulb. Is. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  The power to which the dimming signal is added in the phase control circuit 12 is input to the dimming control circuit 14 shown in FIG. 3, but the dimming signal is not added to the dimming control circuit 14 in FIG. The electric power from the power source is input to the constant voltage DC power source unit 15. Therefore, the dimming volume 21 manually inputs the dimming signal to the light emitting diode based on the dimming signal for the light bulb. The arithmetic control unit 18 outputs a command to the switching circuit 17 on the basis of the light output characteristic curve C1 of the light bulb and the light output characteristic curve C2 of the light emitting diode stored in the storage unit 19 and performs PWM control to control the LED light source unit 11. Dimming control is performed so that the light output of the light emitting diode approximates the light output of the light bulb. Thereby, even if it is a location which cannot supply the electric power from a phase control circuit, the electric power for lighting the light emitting diode which is a light source can be obtained, and light control can be manually performed in the vicinity of the LED light source part 11. FIG.

  In the above description, the case where the power from the power source not including the dimming signal is input to the constant voltage DC power source unit 15 has been described. However, the dimming signal is input to the constant voltage DC power source unit 15 by the phase control circuit 12. The present invention can also be applied to a case where added power is input. In this case, the ignition phase detection circuit 16 is still added. When electric power in which the dimming signal is added by the phase control circuit 12 is input to the constant voltage DC power supply unit 15, the dimming control is performed by the phase control circuit 12. Can be manually changed by the dimming volume 21 when the LED light source unit 11 is changed in the vicinity of the LED light source unit 11, so that the operability is improved.

  FIG. 8 is a block configuration diagram showing another example of the dimming control circuit 14 when power from a power source that is not phase-controlled is input to the dimming control circuit. In place of the dimming volume 21, the dimming control circuit 14 shown in FIG. 7 is provided with a dimming signal input terminal 22 for inputting a dimming signal to the light emitting diode based on the dimming signal for the bulb from the outside. Is. The same elements as those in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted.

  In the dimming control circuit 14 of FIG. 8, power from a power source not taking into account the dimming signal is input to the constant voltage DC power source unit 15. Therefore, dimming control is performed by a dimming signal input from the outside to the dimming signal input terminal 22.

  When the dimming signal is input to the dimming signal input terminal 22, the arithmetic control unit 18 performs switching based on the light output characteristic curve C1 of the light bulb and the light output characteristic curve C2 of the light emitting diode stored in the storage unit 19. A command is output to the circuit 17 and the dimming control is performed by PWM control so that the light output of the light emitting diode of the LED light source unit 11 approximates the light output of the bulb. Thereby, even if it is a place which cannot supply the electric power from a phase control circuit, the electric power for lighting the light emitting diode which is a light source can be obtained, and light control can be performed in the vicinity of the LED light source part 11. FIG.

  In the above description of FIG. 7 and FIG. 8, the case where the power from the power source 10 not including the dimming signal is input to the constant voltage DC power source unit 15 has been described. The same can be applied to the case where electric power in which the dimming signal is added in the circuit 12 is input. In this case, the ignition phase detection circuit 16 or the voltage detection circuit 20 remains added. When electric power in which the dimming signal is added by the phase control circuit 12 is input to the constant voltage DC power supply unit 15, the dimming control is performed by the phase control circuit 12. In addition, since the dimming control can be performed also by the dimming signal to the dimming signal input terminal 22, the dimming control by the phase control circuit 12 can be easily changed and the operability is improved.

  For example, when the LED lighting device is dimmed using a portable dimming table, the dimming signal is different from the case where dimming control is performed with the phase-controlled power in the portable dimming table. By providing the switching means for switching between the case where the dimming control is performed by hand, the hand operability may be improved.

  Further, in an entire lighting system such as a studio, when an LED lighting device and a light bulb lighting device having a light bulb as a light source are provided, the LED lighting device and the light bulb lighting device are dimmed with the same dimming signal. With the dimming console, an existing lighting device using a light bulb and an LED lighting device can be used in the same lighting system.

  DESCRIPTION OF SYMBOLS 10 ... Power supply, 11 ... LED light source part, 12 ... Phase control circuit, 13 ... Dimming console, 14 ... Dimming control circuit, 15 ... Constant voltage DC power supply part, 16 ... Ignition phase detection circuit, 17 ... Switching circuit DESCRIPTION OF SYMBOLS 18 ... Control calculating part, 19 ... Memory | storage part, 20 ... Voltage detection circuit, 21 ... Dimming volume, 22 ... Dimming signal input terminal, 23 ... Switching means.

Claims (2)

An LED light source unit;
A DC power supply unit which is supplied with a phase control voltage from a phase control circuit capable of continuously phase-controlling a commercial AC voltage and converts the phase control voltage into a rectified and smoothed DC voltage;
A switching circuit which is supplied with the output of the DC power supply unit and can control the power supplied to the LED light source unit;
An ignition phase detection circuit for detecting an ignition phase from a phase control voltage;
The output of the switching circuit is changed according to the detection signal of the ignition phase detection circuit, and the light output change amount of the LED light source unit with respect to the power change amount is smaller in the low level lighting region than in the other regions. A control arithmetic unit for controlling the output of the switching circuit;
LED lighting device characterized by comprising. An LED light source unit;
A DC power supply unit which is supplied with a phase control voltage from a phase control circuit capable of continuously phase-controlling a commercial AC voltage and converts the phase control voltage into a rectified and smoothed DC voltage;
A switching circuit which is supplied with the output of the DC power supply unit and can control the power supplied to the LED light source unit;
A voltage detection circuit for detecting a voltage value of the DC power supply unit;
The switching circuit changes the output of the switching circuit according to the detection signal of the voltage detection circuit, and the light output change amount of the LED light source unit with respect to the power change amount is smaller in the low level lighting region than in the other regions. A control operation unit for controlling the output of
LED lighting device characterized by comprising.

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