JP4375251B2 - Light control device and lighting device - Google Patents

Description

  The present invention relates to a light control device that adjusts a light source by on-phase control and an illumination device that uses the light control device.

  Conventionally, it has a switch unit composed of, for example, a triac connected in series to an AC power source, and by changing the power supplied to the incandescent lamp by on-phase control using this switch unit, the light output of the incandescent lamp There is provided a light control device called so-called incandescent lycon.

  In the past, light-emitting diodes were mainly used for displays such as electric bulletin boards and pilot lamps. However, even in recent years, light-emitting diodes, for example, emit blue light and absorb blue light to yellow. In combination with a phosphor that emits the above-mentioned fluorescence, white light with high luminance can be obtained, so that light-emitting diodes are beginning to be used for illumination applications such as spotlights. Light emitting diodes have the advantage of being small and long life compared to incandescent lamps of the same brightness. Then, an LED lighting device is provided that has a connected portion that can be connected to a connecting portion such as a socket that is formed in the same shape as the base of the incandescent light bulb and is connected to the incandescent light bulb so that the incandescent lamp can be easily replaced. ing. This type of LED lighting device includes a plurality of light emitting diodes arranged in a linear shape or a circular shape, and a rectifying unit that rectifies AC power input from a connected portion, for example, formed of a diode bridge (for example, Patent Documents). 1). However, since the output of the rectifying unit is a pulsating voltage, the maximum voltage needs to be lowered to the rated voltage of the light emitting diode, and the light emitting diode cannot be lighted below a predetermined minimum voltage. The range of was narrow.

Therefore, an LED lighting device having a smoothing capacitor connected between the output terminals of the rectifying unit, for example, having a smoothing capacitor made of, for example, an electrolytic capacitor, and smoothing the output of the rectifying unit and outputting it to the light emitting diode is provided (for example, Patent Document 2). With this LED lighting device, since a voltage close to the rated voltage of the light emitting diode can be constantly applied to the light emitting diode, the upper limit of the brightness of the light emitting diode is increased compared to the former conventional example. The range of light can be widened.
JP-A-5-66718 JP 2004-273267 A

  However, in the illumination device in which the latter conventional LED lighting device is connected to the above conventional light control device, charging of the smoothing capacitor of the LED lighting device is started at the moment when the switch unit is turned on by the on-phase control of the light control device. As a result, the charging current to the smoothing capacitor starts to flow abruptly, and noise such as power superimposed noise and unnecessary radiation noise is generated.

  This invention is made | formed in view of the said reason, The objective is to provide the light control apparatus and illuminating device with which noise is reduced.

  The invention of claim 1 is connected to an LED lighting device for turning on a light-emitting diode and an incandescent lamp, a connection portion that can alternatively connect the light-emitting diode, a dimming ratio setting portion for setting a dimming ratio, and an AC power source. A switch unit that is connected to the power supply unit to turn on / off the supply of power to the connection unit, a zero cross detection unit that detects a zero cross of the output of the AC power supply, and a switch unit when the zero cross is detected by the zero cross detection unit. And a control unit that performs on-phase control to turn on the switch unit at a control delay angle corresponding to the dimming ratio set in the dimming ratio setting unit, and the LED lighting device is connected to the connection unit. A connecting unit, a rectifying unit that rectifies AC power input from the connected unit, a smoothing unit that has a smoothing capacitor connected between the output terminals of the rectifying unit and smoothes the output of the rectifying unit, Delay angle detection to detect control delay angle And a lighting unit that converts the output of the smoothing unit into electric power corresponding to the control delay angle detected by the delay angle detection unit, supplies the light to the light emitting diode, and lights the light emitting diode. Sometimes, the control delay angle is set according to the dimming ratio set in the dimming ratio setting unit from within a predetermined range in which charging of the smoothing capacitor of the LED lighting device is not started immediately after the switch unit is turned on. It is characterized by selecting.

  According to the present invention, when an LED lighting device is connected, noise does not suddenly flow through the switch unit at the moment when the switch unit is turned on. In addition, since a small and inexpensive component having a relatively low rated current can be used, it is possible to reduce the size and the cost.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the smoothing part and the lighting part of the LED lighting device have a characteristic that the smoothing capacitor is not charged at a phase of at least 0 degree to 45 degrees during steady lighting of the light emitting diode, The control unit selects the control delay angle from a range of 0 degrees to 45 degrees.

  According to the present invention, since the ratio of four times the control delay angle to 180 degrees is 0 to 1, the power supplied to the light emitting diode in the lighting unit of the LED lighting device can be associated with the control delay angle. It will be easy.

  According to a third aspect of the present invention, in the first aspect of the present invention, the load selection unit is provided in which the light emitting diode and the incandescent lamp are alternatively selected, and the control unit is configured to select the incandescent lamp in the load selection unit. , Release the restriction that the control delay angle is within a predetermined range, and associate with the range of the dimming ratio set in the dimming ratio setting unit compared to when the light-emitting diode is selected in the load selection unit The range of the control delay angle to be made is made wider.

  According to the present invention, the dimming range when the incandescent lamp is connected to the connection portion is wider than when no load selection portion is provided.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the control unit gradually decreases the control delay angle from 180 degrees immediately after the power is turned on, and the control delay angle is set in the dimming ratio setting unit. Until the value corresponds to the dimming ratio, the restriction that the control delay angle is within a predetermined range is released.

  According to the present invention, the inrush current immediately after power-on can be reduced. Therefore, since a small and inexpensive part having a relatively low rated current can be used, further miniaturization and cost reduction are possible.

  The invention according to claim 5 includes a connected portion connected to the connecting portion, a rectifying portion that rectifies AC power input from the connected portion, and a smoothing capacitor connected between the output terminals of the rectifying portion. A smoothing unit that smoothes the output of the control unit, a delay angle detection unit that detects the control delay angle of the on-phase control, and the light output by converting the output of the smoothing unit into electric power according to the control delay angle detected by the delay angle detection unit An LED lighting device having a lighting unit that is supplied to a diode to be lit, and a light control device according to any one of claims 1 to 4.

  The invention of claim 6 includes an incandescent lamp and the light control device according to any one of claims 1 to 4.

  In the present invention, the control unit selects the control delay angle at least during steady lighting of the light emitting diode from a predetermined range in which charging of the smoothing capacitor of the LED lighting device is not started immediately after the switch unit is turned on. As a result, no current suddenly flows through the switch unit at the moment when the switch unit is turned on, so that noise is reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIG. 2, a dimmer 1 that adjusts and outputs electric power input from an AC power supply AC by on-phase control, and a plurality of light-emitting diode LEDs using the output of the dimmer 1 as a power source And an LED lighting device 2 for lighting the.

  The dimmer 1 is connected from the input unit 11 such as a socket to which an incandescent lamp cap can be attached, and an input unit 11 including, for example, a power plug to which AC power is input from the AC power source AC. A switch unit 13 for turning on / off power supply to the unit 12, a zero-cross detection unit 14 for detecting a zero-cross of AC power input via the input unit 11, and a manually operated operation such as a rotary knob, a slide knob, or a push button A dimming ratio setting unit 15 that has a handle (not shown) and sets a dimming ratio, and a storage unit that stores, for example, a data table indicating a correspondence relationship between a control delay angle and a dimming ratio in on-phase control 16 and a control delay corresponding to the dimming ratio set in the dimming ratio setting unit 15 while turning off the switch unit 13 when the zero cross is detected by the zero cross detecting unit 14 The obtained from the storage unit 16 and a control unit 17 for on phase control for turning on the switch unit 13 in the control delay angle. Furthermore, the load selection part 18 which consists of a dip switch which selects the load connected to the connection part 12 from the LED lighting device 2 and an incandescent lamp is provided. Further, the control unit 17 turns on and off the switch unit 13 via the drive unit 19.

  The LED lighting device 2 is formed, for example, in the same shape as a base of an incandescent bulb, and is connected to a connected portion 21 to which the connecting portion 11 of the light control device 1 is connected, and a rectifying portion that rectifies AC power input from the connected portion 21. 22, a smoothing unit 23 for smoothing the output of the rectifying unit 22, a delay angle detecting unit 24 for detecting a control delay angle in the on-phase control of the light control device 1, and a light emitting diode LED connected in series to the light emitting diode LED Dimming switch unit 25 for turning on / off the power supply of the light source, and dimming control for dimming the light-emitting diode LED by turning on / off the dimming switch unit 25 with a duty ratio corresponding to the control delay angle detected by the delay angle detection unit 24 Part 26. That is, the dimming switch unit 25 and the dimming control unit 26 constitute a lighting unit in the claims.

  An example of a circuit will be specifically described with reference to FIG. First, the light control device 1 will be described. The switch unit 13 includes a triac Q1 connected between one terminal of the input unit 11 and one terminal of the connection unit 12. A series circuit of the output terminal of the phototriac PT1 and resistors R1 and R2 is connected in series to the triac Q1. The connection point of the resistors R1 and R2 is connected to the gate of the triac Q1, and the ceramic capacitor C1 is connected in parallel to the resistor R2 connected between the gate of the triac Q1 and one terminal of the input unit 11. Yes. The dimmer 1 also includes a diode bridge DB1 for full-wave rectifying the output of the AC power supply AC, an electrolytic capacitor C2 for smoothing the output of the diode bridge DB1, and a phototriac PT1 using DC power obtained from the electrolytic capacitor C2 as a power source. And a power supply generation unit 19a formed of, for example, a well-known step-down chopper circuit that generates a power supply voltage Vcc (for example, 5 V) of the light emitting diode. The output of the power generation unit 19a is input to one input terminal of the phototriac PT1, and the emitter of the transistor Q2 is connected to the other input terminal. In the transistor Q2, a resistor R3 is connected between the emitter and the base, a collector is grounded via the resistor R4, and a base is connected to the control unit 17 made of, for example, a microcomputer via the resistor R5. That is, the phototriac PT1, the resistors R1 to R5, the capacitor C1, the diode bridge DB1, the electrolytic capacitor C2, the power supply generation unit 19a, and the transistor Q2 constitute the drive unit 19. Moreover, the zero cross detection part 14 detects a zero cross based on the output of diode bridge DB1. As the switch unit 13, for example, two thyristors (not shown) connected in reverse parallel may be used instead of the triac Q1.

  The operation of the above circuit will be described. When the control unit 17 turns on the transistor Q2 by outputting a HIGH level signal from the terminal connected to the resistor R5, the output end of the phototriac PT1 becomes conductive, and the resistors R1 and R2 are energized to both ends of the resistor R2. Due to the potential difference between them, the capacitor C1 is charged and the triac Q1 is turned on. That is, the output of the AC power supply AC is output from the connection unit 12. On the other hand, when the control unit 17 outputs a LOW level signal from the terminal connected to the resistor R5 to turn off the transistor Q2, the electric circuit between the output terminals of the phototriac PT1 is interrupted, and the resistors R1 and R2 are energized. Since it is stopped, the electric charge of the capacitor C1 is discharged through the resistor R2, and the voltage of the gate of the triac Q1 is lowered, so that the triac Q1 is turned off. That is, the electric circuit between the input unit 11 and the connection unit 12 is interrupted.

  Next, the LED lighting device 2 will be described. The rectifying unit 22 includes a diode bridge DB2 that full-wave rectifies the output of the dimming device 1 input from the connected portion 21, and the smoothing unit 23 is an electrolytic capacitor C3 as a smoothing capacitor connected between the output terminals of the rectifying unit. Consists of. Between both ends of the electrolytic capacitor C3, a series circuit of a plurality of light emitting diodes LED, a current limiting resistor R8, and a switching element Q3 is connected. As the switching element Q3, a MOSFET, a transistor, an IGBT, or the like can be used. A diode D2 is connected in series to the parallel circuit of the series circuit and the electrolytic capacitor C3. Further, the output of the diode bridge DB2 is divided by resistors R6 and R7 and input to a dimming control unit 26 formed of, for example, a microcomputer. The dimming control unit 26 detects the control delay angle based on the potential at the connection point of the resistors R6 and R7, and turns on and off the switching element Q3 with a duty ratio corresponding to the detected control delay angle, thereby controlling the light emitting diode LED. Light control. That is, the resistors R6 and R7 and the dimming control unit 26 constitute the delay angle detecting unit 25, and the resistor R8 and the switching element Q3 constitute the dimming switch unit 24. Even during a period when the electrolytic capacitor C3 is not charged, a holding current for maintaining the ON state of the triac Q1 flows through the resistors R6 and R7.

  By the way, even when the output of the AC power supply AC is input to the LED lighting device 2 as it is, the electrolytic capacitor C3 has a half cycle with respect to the output of the AC power supply AC in a steady state as shown in FIG. Therefore, the input current of the LED lighting device 2 becomes intermittent as shown in FIG. 1A because the current other than the charging current of the electrolytic capacitor C3 is very small. In other words, in the on-phase control as shown in FIG. 1 (b), almost no current flows at the moment when the energization is started, regardless of how the energization start time is selected from the period T0 in which the electrolytic capacitor C3 is not charged. There will be no. In the LED lighting device 2 of the present embodiment, the period in which the phase is 0 degree to 45 degrees is included in the period T0.

  Then, when the LED lighting device 2 is selected as a load in the load selection unit 18, the control unit 17 selects a phase for starting energization in the on-phase control, that is, a control delay angle within a range of 0 ° to 45 °. .

  Specifically, the control unit 17 divides the continuous state of the dimming ratio setting unit 15 (for example, the resistance value when the dimming ratio setting unit 15 is a variable resistor) into 256 stages, and 8 Converts to a dimming level that is digitally expressed in bits. Each dimming level corresponds to a different dimming ratio. For example, as shown in FIG. 4, a higher dimming level corresponds to a higher dimming ratio. The storage unit 16 stores a data table indicating the correspondence between the dimming level and the control delay angle, and the control unit 17 controls the control delay corresponding to the dimming level obtained from the dimming ratio setting unit 15. The switch unit 13 is turned on / off so that the on-phase control is performed at the corners.

  In the LED lighting device 2, the dimming control unit 26 stops energization of the light emitting diode LED for a period of four times as long as the switch unit 13 is turned off per half cycle of the AC power supply AC, and in the remaining time. The light-emitting diode LED is dimmed by turning on and off the dimming switch unit 24 so as to energize the light-emitting diode LED. Since the range of the control delay angle of 0 degrees to 45 degrees corresponds to a quarter of a half cycle, the light emitting diode LED can be dimmed at a dimming ratio of 0% to 100% by the above control. When the AC power supply AC is a commercial power supply having a frequency of 60 Hz (half cycle≈8.333 ms), the dimming step, the dimming ratio, and the ON time during which the switch unit 13 is turned on per half cycle of the output of the AC power source AC, The relationship of the LED energization time during which the light emitting diode is energized per half cycle of the output of the AC power supply AC is, for example, as shown in the following table.

  Further, immediately after the power is turned on, the control unit 17 releases the restriction on the range of the control delay angle, and gradually approaches the control delay angle from 180 degrees to a value corresponding to the light control level. In other words, the power output from the connection unit 12 is gradually increased, and the inrush current immediately after the power is turned on is suppressed. Therefore, as a component constituting the switch unit 13, the rated current is relatively small and inexpensive. Since parts can be used, it is possible to reduce the size and cost.

  Further, when the incandescent lamp L is connected to the connection unit 12 as shown in FIG. 5, if the incandescent lamp is selected by the load selection unit 18, the restriction on the range of the control delay angle is released, and the well-known incandescent lamp is released. Operates in the same way as the Ricon. Here, even if the load selection unit 18 is not provided, the dimming of the incandescent lamp L can be performed within the range of the control delay angle of 0 degree to 45 degrees. This is desirable because the light control range is widened. Further, in place of the incandescent lamp L, the load selection unit 18 selects the incandescent lamp even when a conventional LED lighting device that does not include the dimming switch unit 24 and the dimming control unit 26 is connected to the connection unit 12. A certain amount of light control is possible.

  According to the above configuration, the control delay angle is selected within a range in which no current flows through the switch unit 13 at the moment when the switch unit 13 is turned on. Therefore, when the switch unit 13 is turned on, the current is rapidly applied to the switch unit 13. Does not flow. Therefore, noise such as power supply superimposed noise and unnecessary radiation noise can be reduced. In addition, as a component constituting the switch unit 13, a small and inexpensive component having a relatively small rated current can be used, so that the size and cost can be reduced.

  In the LED lighting device 2, the output of the smoothing unit 23 is substantially constant (for example, approximately 141 V when the effective voltage of the AC power supply AC is 100 V), and the light is adjusted depending on the energization time of the light emitting diode LED. Compared with the case where the light emitting diode LED is dimmed by phase control, the correspondence between the dimming ratio and the operation is simple, and the dimming to a lower dimming ratio is possible, so the range of dimming is wide. Become.

  Here, even if the range of the control delay angle is not set to 0 degree to 45 degrees as described above, the above effect can be obtained as long as the current does not flow through the switch part 13 at the moment when the switch part 13 is turned on. It is done. However, in the present embodiment, the range of the control delay angle is set to 0 degree to 45 degrees, that is, a quarter of a half cycle, so that the period during which the current to the light emitting diode LED is stopped is set to the switch unit 13 in the light control device 1. Dimming from 0% to 100% can be achieved with a simple conversion that is four times as long as the period of turning off. Therefore, when the dimming control unit 26 is configured with a relatively simple circuit, or when the dimming control unit 26 is configured with a microcomputer, the process in the dimming control unit 26 is simply performed, for example, as a 2-bit shift operation. Therefore, the manufacturing cost can be reduced by using a relatively inexpensive microcomputer.

  In addition, in the LED lighting device 2, as shown in FIG. 6, according to the rated voltage and the number of light emitting diodes LED to be used, for example, the power adjustment unit 27 including a known chopper circuit using an IPD (Intelligent Power Device) is smoothed. You may connect between the part 23 and light emitting diode LED.

  Further, the number of light emitting diodes LED may be one instead of a plurality. Alternatively, circuits each including the light emitting diode LED may be connected in parallel to each other.

  Further, in the power generation unit 19a and the power adjustment unit 27, a desired voltage may be obtained using a transformer or a resistor instead of using a chopper circuit.

  Further, as the rectifying unit 22, instead of using the diode bridge DB2 that full-wave rectifies the output of the dimmer 1, a single diode that half-wave rectifies the output of the dimmer 1 may be used.

  Further, in the light control device 1, the storage unit 16 and the control unit 17 may be configured by a one-chip microcomputer.

It is explanatory drawing which shows an example of operation | movement of embodiment of this invention, (a) shows the input current of a LED lighting device, (b) shows the input voltage of a LED lighting device, (c) is LED lighting device. The output of the smoothing part is shown. It is a block diagram which shows the same as the above. It is a circuit diagram which shows the specific example of a circuit same as the above. It is a graph which shows one example of the relationship between a light control step and a light control ratio. It is a block diagram which shows the state which connected the incandescent lamp same as the above. It is a block diagram which shows another form same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light control apparatus 2 LED lighting device 12 Connection part 13 Switch part 14 Zero cross detection part 17 Control part 18 Load selection part 21 Connected part 22 Rectification part 23 Smoothing part 24 Dimming switch part 25 Delay angle detection part 26 Dimming control part C3 electrolytic capacitor

Claims (6)

Connected between the connection part that can selectively connect the LED lighting device for turning on the light emitting diode and the incandescent lamp, the dimming ratio setting part for setting the dimming ratio, and the AC power source and the connecting part. Switch unit for turning on / off the power supply to the connection unit, zero cross detection unit for detecting the zero cross of the output of the AC power supply, and turning off the switch unit when the zero cross is detected by the zero cross detection unit and setting the dimming ratio A control unit that performs on-phase control to turn on the switch unit with a control delay angle corresponding to the dimming ratio set in the unit,
The LED lighting device includes a connected portion connected to the connecting portion, a rectifying portion that rectifies AC power input from the connected portion, and a smoothing capacitor connected between the output terminals of the rectifying portion. A smoothing unit for smoothing the output, a delay angle detecting unit for detecting the control delay angle of the on-phase control, and converting the output of the smoothing unit into electric power according to the control delay angle detected by the delay angle detecting unit, With a lighting part to supply and light,
The control unit has a control delay angle at least during steady lighting of the light emitting diode, and a dimming ratio setting unit from a predetermined range in which charging of the smoothing capacitor of the LED lighting device is not started immediately after the switch unit is turned on. The dimming device is selected according to the dimming ratio set in the above.   In the LED lighting device, the smoothing unit and the lighting unit have a characteristic that the smoothing capacitor is not charged at a phase of at least 0 degree to 45 degrees during steady lighting of the light emitting diode, and the control unit has a control delay angle of 0 degree to 45 degrees. The light control device according to claim 1, wherein the light control device is selected from the range.   Provided with a load selection unit in which light-emitting diodes and incandescent lamps are alternatively selected, and when the incandescent lamp is selected by the load selection unit, the control unit releases the restriction that the control delay angle is within a predetermined range The range of the control delay angle associated with the range of the dimming ratio set in the dimming ratio setting unit is wider than when the light emitting diode is selected in the load selection unit. The light control device according to claim 1.   The control unit gradually decreases the control delay angle from 180 degrees immediately after the power is turned on, and until the control delay angle reaches a value corresponding to the dimming ratio set in the dimming ratio setting unit, the control delay The light control device according to claim 1, wherein the restriction that the angle is within a predetermined range is released. A smoothing unit having a connected part connected to the connecting part, a rectifying part for rectifying AC power input from the connected part, and a smoothing capacitor connected between the output terminals of the rectifying part and smoothing the output of the rectifying part Unit, a delay angle detection unit for detecting the control delay angle of the on-phase control, and the output of the smoothing unit is converted into electric power according to the control delay angle detected by the delay angle detection unit and supplied to the light emitting diode to be lit. An LED lighting device having a lighting unit;
An illumination device comprising: the light control device according to claim 1.   An illuminating device comprising an incandescent lamp and the light control device according to claim 1.

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