JP5954653B2 - Dimming signal converter and lighting system using the same - Google Patents

Description

  The present invention relates to a dimming signal converter and an illumination system using the same.

  2. Description of the Related Art Conventionally, there has been provided a power supply device that dimms a light source in accordance with a dimming signal (duty signal) output from a dimmer (see, for example, Patent Document 1). In such a power supply device, the light source is generally turned on (FULL lighting) when there is no signal when the dimmer signal is not output from the dimmer. As an example, the duty ratio of the dimmer signal is 0%. When it is 80%, turn on the light source at the light control lower limit, and turn it off when the light source is over.

  There is also provided a power supply device for dimming and lighting a light source by changing a conduction angle of a power supply voltage supplied from an external power source to the light source. In such a power supply device, the light source is dimmed by controlling the conduction angle of the power supply voltage supplied from the external power supply to the light source by controlling on / off of the triac interposed between the external power supply and the light source. Light up.

  Here, when the above-described former power supply device is installed, if the light source for the latter power supply device is replaced, the entire device including the dimmer must be replaced. It will take. Therefore, there is an increasing demand for a conversion device that converts a dimming signal into a phase control signal so that only the light source can be exchanged while leaving the dimmer, and a conversion device is interposed between the dimmer and the light source. By converting the dimming signal into the phase control signal, the dimming of the light source corresponding to the phase control method becomes possible.

Japanese Patent No. 4636102

  However, in the former power supply device described above, the light source is fully turned on when there is no light control signal output from the light control device. Therefore, if the input of the light control signal is delayed with respect to the start-up of the power supply, the light control is performed. There has been a problem that the light source is instantly fully lit in the non-signal section until the signal is input.

  In the former power supply device, an RC circuit may be provided at the input portion of the conversion device as a noise countermeasure. In this case, when the power supply is turned on with the dimming signal instructing turning off, the light is turned off. There is a problem in that the light source is instantly turned on in the same manner because it goes through the full lighting state in the process up to the state.

  The present invention has been made in view of the above problems, and its object is to provide a dimming signal conversion device that eliminates instantaneous full lighting of a lighting fixture at the time of power-on and lighting using the same. To provide a system.

The dimming signal conversion device of the present invention is directed to an input unit that inputs a dimming signal that indicates a dimming rate of a lighting fixture and that has a duty ratio set to 0% when the lighting fixture is fully lit. And a control unit that controls the conduction angle of the power supply voltage supplied from the external power source to the lighting fixture in accordance with the dimming signal input to the light source. The control unit stops the control of the conduction angle until the first time elapses after the dimming signal is input at the start of power supply from the external power source to the control unit.

  In this dimming signal conversion device, the input unit is composed of an RC circuit including a resistor and a capacitor, and the first time is preferably equal to or longer than the time until the voltage across the capacitor reaches a predetermined value.

  Further, in this dimming signal conversion device, the control unit determines the conduction angle when the dimming signal is not input before the second time longer than the first time elapses from the start of power feeding from the external power supply to the control unit. It is also preferable to set an angle corresponding to a dimming signal with a duty ratio of 0%.

  The illumination system of the present invention includes the dimming signal conversion device described above, a signal output device that outputs a dimming signal to the dimming signal conversion device, and a lighting fixture.

  According to the present invention, since the phase control of the luminaire is stopped until the first time elapses after the dimming signal is input at the time of power supply startup, It is possible to obtain a dimming signal converter that eliminates all lighting and a lighting system using the same.

(A) is a schematic block diagram of the illumination system of this embodiment, (b) is a schematic block diagram of the lighting fixture which comprises the same. (A)-(d) is a graph for demonstrating operation | movement same as the above. (A), (b) is a timing chart for demonstrating an operation | movement same as the above.

  Hereinafter, an embodiment of a dimming signal conversion device and an illumination system will be described with reference to FIGS.

  Fig.1 (a) is a schematic block diagram of the illumination system of this embodiment. In the present invention, the lighting system means a system including at least one lighting fixture and connected so that the lighting fixture can be appropriately controlled. The illumination system of the present embodiment includes a luminaire 1, a dimming signal conversion device 2, and a dimmer (signal output device) 3 as main components.

  FIG. 1B is a schematic configuration diagram of the lighting fixture 1. The luminaire 1 includes a light emitting unit 10 including a plurality (two in the present embodiment) of light emitting diodes 10A connected in series, and a constant current control unit 16 that controls a current flowing through the light emitting unit 10. The luminaire 1 includes a rectifying unit 12 that rectifies an AC voltage supplied from a commercial power source (external power source) 4, a smoothing unit 13 that smoothes the output of the rectifying unit 12 and outputs the output to the light source unit 10, and a rectifying unit 12. And a voltage detector 14 for detecting the output voltage of the output. Furthermore, the luminaire 1 detects the conduction angle based on the period during which the voltage is detected by the voltage detection unit 14, and the dimming control for dimming the light source unit 10 using the constant current control unit 16 with a duty ratio based on the conduction angle. The unit 15 is provided.

  The rectifying unit 12 includes a diode bridge that full-wave rectifies the AC voltage supplied from the commercial power supply 4, and the smoothing unit 13 is connected between the diode D1 and the output terminal of the rectifying unit 12 via the diode D1. It consists of a capacitor C1. The voltage detection unit 14 includes a series circuit of resistors R2 and R3 connected between the output terminals of the rectification unit 12. Therefore, in the voltage detection unit 14, the output voltage of the rectification unit 12 is divided by the resistors R2 and R3, and the dimming control unit 15 detects the conduction angle based on the potential at the connection point of the resistors R2 and R3.

  The dimming signal conversion device 2 is a device for converting a dimming signal (duty signal) into a phase control signal, and is connected to the input end as shown in FIG. Including a capacitor C2 and an inductor L1, and a bidirectional triac Q1 having a self-holding function. When the triac Q1 is in a conductive state (turned on), AC power is supplied from the commercial power source 4 to the lighting fixture 1. The dimming signal converter 2 includes a smoothing capacitor C3 that smoothes an AC voltage supplied from the commercial power supply 4 via the diode D2, and a power supply IC 20 that converts the output voltage from the smoothing capacitor C3 into a constant voltage. . The power supply IC 20 is a switching power supply, and a diode D3 is connected to the negative side terminal of the smoothing capacitor C3.

  A closed circuit including an inductor L2, a capacitor C4, and a diode D4 is connected to the output terminal of the power supply IC 20, and this closed circuit charges the capacitor C4 with a regenerative current flowing through the inductor L2, thereby allowing the gate of the triac Q1 to be connected. The terminal potential is set lower than the potentials of the other two main terminals. That is, the capacitor C4 serves as a control power source necessary for controlling conduction / non-conduction of the triac Q1.

  A phase detection circuit 21 is connected to one end of the commercial power supply 4 via a diode D5. The phase detection circuit 21 generates a synchronization signal based on the phase of the power supply voltage supplied from the commercial power supply 4 and outputs it to the control circuit 22 described later. As an example, the phase detection circuit 21 compares the power supply voltage of the commercial power supply 4 with a predetermined threshold value, and when the power supply voltage of the commercial power supply 4 exceeds the threshold value, the phase detection circuit 21 raises the synchronization signal. When the value falls below the threshold, the synchronization signal falls.

  The gate terminal of the triac Q1 is connected to the collector terminal of the switching element Q2 made of an npn transistor. Further, the capacitor C4 is connected to the emitter terminal of the switching element Q2, and the control circuit 22 is connected to the base terminal.

  An RC circuit (input unit) 23 composed of a resistor R4 and a capacitor C5 is connected to the control circuit 22. The RC circuit 23 is an input circuit for noise suppression, and smoothes the dimming signal output from the dimmer 3 described later to a direct current and outputs it to the control circuit 22.

  The control circuit 22 generates a trigger signal for switching on / off of the switching element Q2 based on the synchronization signal given from the phase detection circuit 21 and the dimming signal given from the dimmer 3 via the RC circuit 23. . The timing for generating the trigger signal is determined based on the rising timing of the synchronization signal, and the generated trigger signal is input to the base terminal of the switching element Q2. Then, when the trigger signal is at a high level, the switching element Q2 is turned on, and the potential of the gate terminal of the triac Q1 becomes lower than the potentials of the other two main terminals, so that a current flows through the gate terminal. The triac Q1 becomes conductive.

  The rising timing of the trigger signal varies depending on the dimming signal output from the dimmer 3. For example, when the dimming rate is large, the trigger signal pulse width is increased by increasing the trigger signal rising speed, When the dimming rate is small, the pulse width of the trigger signal is reduced by delaying the rise of the trigger signal. Thereby, since the conduction | electrical_connection period of the power supply voltage applied to the lighting fixture 1 can be changed, the light control signal conversion which can convert the light control signal output from the light control device 3 into a phase control signal (trigger signal) An apparatus 2 can be provided. Here, in the present embodiment, a control unit is configured by the control circuit 22, the triac Q1, and the switching element Q2.

  The dimmer 3 has a rectangular box-shaped dimmer main body 30 attached to a wall surface or the like, and a rotary operation knob 31 for setting the dimming level of the lighting fixture 1 on the front surface of the dimmer main body 30. And the setting switch 32 which sets the light control characteristic of the lighting fixture 1 is provided. Then, the operation knob 31 is rotated and set to a predetermined operation angle, whereby a dimming signal corresponding to the operation angle is output from the dimmer 3.

  FIG. 2A is a graph showing the relationship between the operation angle of the operation knob 31 of the dimmer 3 and the duty ratio of the dimming signal, and changes as shown by the solid line a or the solid line b depending on the setting state of the setting switch 32. . In the case of the solid line a, the duty ratio is 80% when the operation angle is 0 °, and the duty ratio is 0% when the operation angle is 270 °. In the case of the solid line b, the duty ratio is 100% when the operation angle is 0 °, and the duty ratio is 0% when the operation angle is 270 °.

  FIG. 2B is a graph showing the relationship between the ON width of the dimming signal input to the RC circuit 23 of the dimming signal converter 2 and the AD value obtained by digitally converting the ON width. ) Is a graph showing the relationship between the AD value and the conduction angle of the phase control signal. According to these graphs, the AD value increases as the ON width of the dimming signal increases as indicated by the solid line c, and the conduction angle decreases as the AD value increases as indicated by the solid line d. That is, the conduction angle decreases as the ON width of the dimming signal increases.

  FIG. 2D is a graph showing the relationship between the conduction angle of the phase control signal and the dimming rate. In the region e where the conduction angle is small and the region g where the conduction angle is large, the dimming rate increases as the conduction angle increases. In the middle region f, the dimming rate rapidly increases as the conduction angle increases. From the above, in the illumination system of the present embodiment, when the operation angle of the operation knob 31 of the dimmer 3 is 0 °, the dimming rate of the light source unit 10 of the luminaire 1 is set to the dimming lower limit. When the operation angle of the knob 31 is 270 °, the dimming rate of the light source unit 10 is set to 100%.

  Next, operation | movement of the illumination system of this embodiment is demonstrated. When the user operates the operation knob 31 of the dimmer 3, a dimming signal corresponding to the operation angle of the operation knob 31 is output from the dimmer 3, and this dimming signal is sent to the control circuit 22 via the RC circuit 23. Entered. At this time, the phase detection circuit 21 detects the power supply voltage of the commercial power supply 4 to generate a synchronization signal, and this synchronization signal is input to the control circuit 22. The control circuit 22 generates a trigger signal (phase control signal) based on the input dimming signal and synchronization signal, and outputs the generated trigger signal to the base terminal of the switching element Q2. Accordingly, the switching element Q2 is turned on as the trigger signal rises, and the triac Q1 is turned on (turned on). Thereby, the power supply voltage of the commercial power supply 4 is applied to the lighting fixture 1.

  Thereafter, when the trigger signal output from the control circuit 22 falls, the switching element Q2 is turned off, so that no current flows through the gate terminal of the triac Q1. Since the triac Q1 maintains a conduction state while a holding current of a certain level or more flows, the power supply voltage of the commercial power supply 4 is continuously applied to the lighting fixture 1 for a while after the trigger signal falls. When the power supply voltage of the commercial power supply 4 reaches zero cross, the holding current flowing through the triac Q1 becomes a certain value or less, and the triac Q1 switches to a non-conducting state (turns off). Thereby, the power supply voltage of the commercial power supply 4 is not applied to the lighting fixture 1.

  On the other hand, in the lighting fixture 1, the dimming control unit 15 detects the conduction angle based on a period during which the voltage is detected by the voltage detection unit 14. Then, the dimming control unit 15 performs dimming lighting of the light source unit 10 when the constant current control unit 16 changes the current at a duty ratio based on the detected conduction angle.

  By the way, when the dimming signal having a duty ratio of 0% is input to the control circuit 22 described above, the conduction angle of the phase control signal (trigger signal) is set to a predetermined angle that causes the lighting fixture 1 to be fully lit (this embodiment). For example, when the input of the dimming signal is delayed with respect to the rise of the power supply, a section in which the duty ratio of the dimming signal is 0% is generated. 1 turns on all the moment. Further, as in the present embodiment, when the RC circuit 23 is provided at the input portion of the dimming signal conversion device 2 as a noise countermeasure, when the power is turned on with the dimming signal instructing turning off, Since the entire lighting state is passed through the process until the lighting state is turned off, similarly, the light source unit 10 is instantaneously completely turned on.

  Therefore, in the present embodiment, by stopping the phase control of the luminaire 1 until a predetermined time (first time) elapses after the dimming signal is input to the control circuit 22, the above problem is solved, This will be specifically described below. FIGS. 3A and 3B are timing charts for explaining the above-described operation. At time 2 after power is supplied to the dimming signal converter 2 and the dimmer 3 at time t1. Then, a dimming signal (DUTY signal) is output from the dimmer 3. And the control circuit 22 of the light control signal converter 2 starts the phase control of the lighting fixture 1 at the time t3 when 1st time passed from the time t2 when a light control signal is input. That is, in the present embodiment, the phase control of the lighting fixture 1 is stopped until the first time has elapsed after the dimming signal is input. Lighting can be eliminated. Note that the above first time is longer than the time until the dimming signal input to the control circuit 22 through the RC circuit 23 is stabilized, that is, the time until the voltage across the capacitor C5 reaches a predetermined value. Is preferred.

  When the duty ratio of the dimming signal output from the dimmer 3 is set to 0%, the dimming signal is not output even when the power is turned on. Cannot be detected, and the first time cannot be counted. And in this case, the light source part 10 of the lighting fixture 1 will maintain a light extinction state. Therefore, in this embodiment, when the dimming signal is not input to the control circuit 22 until the second time longer than the first time elapses after the power is turned on, the control circuit 22 has a duty ratio of 0%. It is determined that a dimming signal is input, and the conduction angle of the phase control signal is set to an angle corresponding to the dimming signal (180 ° in this embodiment). Thereby, even when the power is turned on while the duty ratio of the dimming signal is set to 0%, the light source unit 10 of the lighting fixture 1 can be fully turned on.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Dimming signal converter 3 Dimmer (signal output device)
4 Commercial power (external power)
22 Control circuit (control unit)
23 RC circuit (input unit)
Q1 Triac (control unit)
Q2 Switching element (control unit)

Claims (4)

Instructing the dimming rate of the luminaire, an input unit for inputting a dimming signal in which a duty ratio when the luminaire is fully turned on is set to 0%;
A control unit for controlling a conduction angle of a power supply voltage supplied from an external power source to the lighting fixture according to the dimming signal input to the input unit;
The control unit stops the control of the conduction angle until a first time elapses after the dimming signal is input at the start of power supply from the external power source to the control unit. Optical signal converter. The input unit includes an RC circuit including a resistor and a capacitor,
2. The dimming signal conversion device according to claim 1, wherein the first time is equal to or longer than a time until the voltage across the capacitor reaches a predetermined value.   When the dimming signal is not input before the second time longer than the first time elapses from the start of power supply from the external power source to the control unit, the control unit sets the conduction angle to a duty ratio of 0. The dimming signal conversion device according to claim 1, wherein the dimming signal conversion device is set to an angle corresponding to% of the dimming signal.   The dimming signal conversion device according to claim 1, a signal output device that outputs the dimming signal to the dimming signal conversion device, and the lighting fixture. Lighting system characterized by

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