JP5613424B2 - Light emitting diode lighting device - Google Patents

Description

  The present invention relates to a light emitting diode lighting device, and more particularly to a light emitting diode lighting device corresponding to a two-wire phase control dimmer.

  As a light emitting diode lighting device, there is one corresponding to a two-wire phase control dimmer. This two-wire phase control dimmer is for performing dimming control of a light emitting diode, and a triac is usually used as a switch element.

  Triac is a bidirectional power element used for AC phase control, and a relatively small trigger current is passed through the gate to conduct the main electrode and maintain the conducting state until the holding current disappears. Conversely, when there is no trigger current at the gate, no conduction occurs regardless of which of the main electrodes is positive. For this reason, the conduction period of the main electrode can be adjusted in a half cycle of the alternating current by adjusting the timing of supplying the trigger current to the gate with the volume attached to the dimmer. Such a two-wire phase control dimmer is widely used as a dimming means because brightness corresponding to the conduction period can be obtained by using an incandescent lamp as a load.

  By the way, in recent years, light-emitting diodes have been rapidly spread as a replacement load for incandescent lamps in order to save energy and regulate carbon dioxide emission. In order to light up such a light emitting diode, a dedicated lighting control device is required, and this lighting control device is generally composed of electronic components such as a capacitor, an inductor, and a resistor as circuit components (for example, , See Patent Document 1).

  FIG. 7 shows a conventional example in which the lighting control device is used in combination with a two-wire phase control dimmer. As shown in FIG. 7, a two-wire phase control dimmer 1 and a lighting control device 2 are provided, and a triac 4 is mounted on the two-wire phase control dimmer 1 connected to the AC power supply 3. . In the lighting control device 2, a capacitor C1 and an inductor L1 are provided between both electrodes of the input line 5, and a rectifier diode DB1 is connected to the input line 5 so that a current after rectification flows through the output line 6. A capacitor C4 is provided between both electrodes. The output line 6 is connected to an LED driver unit 7, and a plurality of light emitting diodes LED are connected to the LED driver unit 7. The capacitors C1 and C4 are provided as an EMI (Electro Magnetic Interference) countermeasure, for example.

When the two-wire phase control dimmer 1 and the lighting control device 2 are combined, the main electrode of the triac 4 in the two-wire phase control dimmer 1 is synchronized as shown by a broken line in FIG. As a result, a pulsed inrush current I _R1 flows through the capacitors C1 and C4. At the falling portion of the inrush current I _R1 , current oscillation occurs due to the influence of the L component such as the inductance of the input line 5 and the C component such as the capacitor capacity.

  When current oscillation occurs, the current flowing through the main electrode of the triac 4 may be lower than the holding current value of the triac 4, and when the triac 4 falls below the holding current, the main electrode is turned off. This phenomenon usually changes randomly in the ON period due to an abnormal operation that turns OFF when the main electrode must be kept ON. When viewed from the lighting control device 2, since the input power supply changes randomly, the output changes and flickering occurs in the light emitting diode LED.

  As a means for suppressing such current oscillation, conventionally, as shown in FIG. 7, a method of adding an input resistor R <b> 1 to an input line connected to the two-wire phase control dimmer 1 in the input line 5 is known. Are known. In this way, the addition of the R component to the L and C components suppresses current oscillation due to the L and C components. In this case, the occurrence of the abnormal operation of the triac 4 can be avoided by setting the resistance value of the input resistor R1 to a level at which the lower limit of the current oscillation does not become less than the holding current. In the light emitting diode lighting device in which the input resistor R1 is added to the input line 5, brightness according to the conduction period of the triac 4 can be obtained.

JP 2006-147252 A

  However, when the input resistor R1 is added to the input line 5 as in the above-described prior art, generally, a resistor having a large resistance value is added as the input resistor R1, so that heat is generated by the input resistor R1, and the LED lighting device There arises a problem that the whole temperature rises, and a loss of power energy occurs due to the input resistance R1, resulting in a problem that energy efficiency is lowered. Further, there is a problem in that the cost of the light emitting diode lighting device is increased by adding the input resistor R1.

  The problem of the present invention is that even when a two-wire phase control dimmer and a lighting control device are combined, light emission can be controlled without any problem without adding an input resistance or by adding a relatively small input resistance value. The object is to provide a diode lighting device.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a dimming unit for dimming a light-emitting diode and a lighting control unit for performing lighting control of the light-emitting diode. The unit has a power phase control element that performs phase control of AC power, and performs light control by controlling the power supplied by the power phase control element, while the lighting control unit is connected to the light control unit and the AC power source. An input line to which the supplied power is input, a rectifier circuit that rectifies current flowing through the input line connected to the input line, and an output line that is connected to the rectifier circuit and outputs the rectified current to the light emitting diode with the door, both between the two electrodes of the electrodes and between the output line of the input line of the lighting control unit is characterized by a resistor and a snubber circuit comprising a capacitor provided respectively.

According to the above arrangement, since both the snubber circuit between the electrodes between the electrodes of the input line of the lighting control unit, and an output line is provided, the inrush current is held over the holding current value, thereby, the inrush It is possible to suppress the occurrence of current oscillation at the falling edge of the current. Therefore, according to the above configuration, it is possible to prevent the temperature of the entire device from increasing and the loss of power energy without adding an input resistance or by adding a relatively small input resistance value, and also increase the cost of the device. It becomes possible to suppress.

  According to a second aspect of the present invention, in the first aspect, the power phase control element is a triac.

  According to a third aspect of the present invention, in the second aspect of the present invention, a switch circuit for short-circuiting the resistance of the snubber circuit is provided in a period other than when the main electrode of the triac is turned on.

  According to a fourth aspect of the present invention, in the second aspect, a switch circuit that opens the snubber circuit is provided during a period other than when the main electrode of the triac is turned on.

  The invention according to claim 5 is the input line according to claim 2, which is any one of the input line between the dimming unit and the lighting control unit and the input line between the AC power source and the lighting control unit. An input resistor is provided on the power supply line, or an input resistor is provided on a power supply line connecting the AC power supply and the light control unit.

The present invention can also be applied to a light-emitting diode lighting device without a dimmer. That is, in the invention described in claim 6, the lighting control unit for performing the lighting control of the light emitting diode is connected to the input line to which the power supplied from the AC power source is input, and flows through the input line. a rectifier circuit for rectifying an electric current, which is connected to the rectifier circuit and an output line for outputting a current after rectification to the light emitting diode, both between the two electrodes of the electrodes and between the output line of the input line It is characterized by a resistor and a snubber circuit comprising a capacitor provided respectively.

  According to the present invention, it is possible to prevent temperature rise and loss of power energy of the entire apparatus without adding input resistance or by adding a relatively small input resistance value, and further suppress the cost increase of the apparatus. It is possible to realize a light emitting diode lighting device capable of performing the following.

1 is an overall configuration diagram of a light-emitting diode lighting device according to Example 1. FIG. It is a figure which shows the voltage waveform when performing phase control with respect to alternating voltage, and the waveform of an inrush current. The falling part of the inrush current is shown in an enlarged manner, (a) is a diagram showing a state in which current vibration is generated in the falling part, and (b) is a state in which no current vibration is generated in the falling part. FIG. It is a whole block diagram of the light emitting diode lighting device by Example 2. It is a whole block diagram of the light emitting diode lighting device by Example 3. It is a whole block diagram of the light emitting diode lighting device by Example 4. It is a whole block diagram of the light emitting diode lighting device by a prior art.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same location as a prior art, suppose that a code | symbol is written in the same way.

Example 1
FIG. 1 is an overall configuration diagram of a light-emitting diode lighting device according to a first embodiment. This light emitting diode lighting device has a two-wire phase control dimmer 1 as a dimming unit and a lighting control device 2 as a lighting control unit. The two-wire phase control dimmer 1 is connected to an AC power source (commercial AC power source) 3, and a triac 4 is mounted inside as a switch element.

  The lighting control device 2 has two input lines 5 arranged therein, and a capacitor C1 and an inductor L1 are provided between both electrodes of the input line 5, respectively. Of the capacitor C1 and the inductor L1, the inductor L1 is disposed on the side closer to the rectifier diode DB1 described later. The capacitor C1 and the inductor L1 are EMI countermeasure parts and constitute a low-pass filter.

  Further, a rectifier diode DB1 is provided as a rectifier circuit in the lighting control device 2, and an input line 5 is connected to the input side of the rectifier diode DB1. Two output lines 6 are connected to the output side of the rectifier diode DB1, and a capacitor C4 is provided between both electrodes of the output line 6. A current after rectification by the rectifier diode DB <b> 1 flows through the output line 6, and the tip thereof is connected to the LED driver unit 7. A plurality of light emitting diodes LED are connected to the LED driver unit 7. The capacitor C4 is a regenerative capacitor of the LED driver unit 7.

  In this embodiment, a snubber circuit (CR snubber circuit) 11 comprising a resistor R2 and a capacitor C2 is provided between both electrodes of the input line 5. The snubber circuit 11 suppresses the voltage between both electrodes of the input line 5 from vibrating more than the CR cutoff frequency. The CR cutoff frequency is obtained by the following equation.

F = 1 / (2πC · R)
Here, F is the CR cutoff frequency, C is the capacitance of the capacitor C2, and R is the resistance value of the resistor R2.

  In this embodiment, a snubber circuit (CR snubber circuit) 12 including a resistor R3 and a capacitor C3 is provided between the two poles of the output line 6. The snubber circuit 12 suppresses the voltage between both electrodes of the output line 6 from vibrating more than the CR cutoff frequency. The CR cutoff frequency is obtained by the following equation.

      F = 1 / (2πC · R).

  Here, F is the CR cutoff frequency, C is the capacitance of the capacitor C3, and R is the resistance value of the resistor R3.

  Next, the operation of this embodiment will be described.

In the two-wire phase control dimmer 1, the triac 4 performs phase control with a pulse applied to the gate with respect to the AC voltage from the AC power source 3, as shown in the upper part of FIG. A voltage V ₁ having a waveform as shown in FIG.

On the other hand, when the lighting control device 2 is used in combination with the two-wire phase control dimmer 1, the capacitors C1 and C4 in the lighting control device 2 have two-wire phase control dimming as shown in FIG. An inrush current I _R1 (see FIG. 7) flows in synchronization with the main electrode conduction of the triac 4 in the optical device 1. The waveform of this inrush current I _R1 is shown in the lower part of FIG. In FIG. 2, the horizontal axis indicates time t.

Conventionally, current oscillation occurs at the falling portion of the inrush current I _R1 due to the influence of the L component of the inductance by the inductor L1 and the like of the input line 5 and the C component of the capacitance by the capacitors C1 and C4 and the like.

FIG. 3A shows how current oscillation occurs at the falling portion of the inrush current I _R1 . As can be seen from the figure, at the falling portion, the inrush current I _R1 decreases to a holding current value or less, and oscillates at a frequency equal to or higher than the CR cutoff frequency of each end voltage of the input line 5 and the output line 6.

On the other hand, in this embodiment, the snubber circuit 11 is provided between both electrodes of the input line 5 and the snubber circuit 12 is provided between both electrodes of the output line 6, so that as shown in FIG. In addition, the occurrence of current oscillation at the falling portion of the inrush current I _R1 is suppressed, so that the inrush current I _R1 can be held at a holding current value or more. FIG. 3B is an enlarged view of part A in FIG. 3A and 3B, the horizontal axis indicates time t.

  Although an example in which the snubber circuits 11 and 12 are provided is shown here, only one of the snubber circuits 11 and 12 may be provided.

  According to the present embodiment, it is possible to prevent an increase in temperature of the entire apparatus and loss of power energy without adding an input resistance, and it is possible to suppress an increase in cost of the apparatus.

Further, according to the present embodiment, since the inrush current I _R1 is held at the holding current value or more, it is possible to prevent the occurrence of an abnormal operation in which the triac 4 is turned off by the inrush current I _R1 .
Example 2
FIG. 4 shows a second embodiment. In this embodiment, a switch circuit SW1 for short-circuiting the resistor R2 of the snubber circuit 11 and a switch circuit SW2 for short-circuiting the resistor R3 of the snubber circuit 12 are provided. Other configurations are the same as those in the first embodiment.

  In the above configuration, to improve efficiency, during a period other than when the main electrode of the triac 4 is turned on, the switch circuit SW1 is set to “ON” to short-circuit the resistor R2, or the switch circuit SW2 is set to “ON” to set the resistor R3. Are short-circuited, or both of the switch circuits SW1 and SW2 are “entered” to short-circuit the resistors R2 and R3.

According to the present embodiment, during a period other than when the main electrode of the triac 4 is turned on (that is, a period during which the inrush current I _R1 does not flow), at least one of the snubber circuits 11 and 12 is short-circuited. It is possible to improve efficiency reduction.
Example 3
FIG. 5 shows a third embodiment. In this embodiment, a switch circuit SW3 for opening the snubber circuit 11 and a switch circuit SW4 for opening the snubber circuit 12 are provided. Other configurations are the same as those in the first embodiment.

  In the above configuration, to improve efficiency, the switch circuit SW3 is set to “OFF” to open the snubber circuit 11 or the switch circuit SW4 is set to “OFF” for a period other than when the main electrode of the triac 4 is turned ON. The circuit 12 is opened, or both the switch circuits SW3 and SW4 are turned off to open the snubber circuit 11 and the snubber circuit 12.

According to the present embodiment, during a period other than when the main electrode of the triac 4 is turned on (that is, a period when the inrush current I _R1 is not flowing), at least one of the snubber circuits 11 and 12 is opened, and the snubber circuit It is possible to improve efficiency reduction.
Example 4
FIG. 6 shows a fourth embodiment. In the present embodiment, an input resistor R 4 is provided on the input line 5 A between the two-wire phase control dimmer 1 and the lighting control device 2 in the input line 5. The input resistance R4 is set to a relatively small resistance value. When the suppression of current oscillation in the snubber circuits 11 and 12 is insufficient, the addition of the input resistor R4 is effective in suppressing current oscillation.

  According to the present embodiment, since the light emitting diode lighting device can obtain brightness according to the conduction period of the triac 4 in the two-wire phase control dimmer 1, it is combined with the two-wire phase control dimmer 1. Can be used.

  According to the present embodiment, the same effect as that of the first embodiment can be obtained by adding a relatively small input resistance value.

  In the present embodiment, an input resistor R4 is added to the configuration of the first embodiment. However, in the configurations of the second and third embodiments, the two-wire phase control dimmer 1 and the lighting control device 2 are connected. An input resistor R4 may be added to the input line 5.

  In FIG. 6, an input resistor R4 may be provided on the input line 5B between the AC power supply 3 and the lighting control device 2, or the AC power supply 3 and the two-wire phase control dimmer 1 are connected. An input resistor R4 may be provided in the power supply line 5C to be used.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, each of the above embodiments is only an example of the present invention, and the present invention is not limited only to the configuration of each of the above embodiments. . Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, instead of the triac 4, other power phase control elements may be used as long as they perform AC voltage phase control.

The present invention can also be applied to a light emitting diode lighting device that does not have the two-wire phase control dimmer 1. That is, this light-emitting diode lighting device is provided with only the lighting control device 2 in FIG. 1, and this lighting control device 2 is connected to the input line 5 to which the power supplied from the AC power source 3 is input and to the input line 5. A rectifier circuit DB1 connected to rectify the current flowing through the input line 5; and an output line 6 connected to the rectifier circuit DB1 to output the rectified current to the light emitting diode LED. it may be configured to have a resistance R2 and a snubber circuit 1 2 consisting of the snubber circuit 11, and the resistor R3 and the capacitor C3 between the electrodes of the output line 6 a capacitor C2 to.

1 2-wire phase control dimmer (Dimming unit)
2 Lighting control device (Lighting control unit)
3 AC power supply 4 Triac (power phase control element)
5, 5A, 5B Input line 5C Power supply line 6 Output line C1 to C4 Capacitor DB1 Rectifier diode (rectifier circuit)
L1 Inductor R1, R4 Input resistance R2, R3 Resistance SW1-SW4 Switch circuit

Claims (6)

It consists of a dimming unit for dimming the light emitting diode and a lighting control unit for performing lighting control of the light emitting diode,
The dimming unit has a power phase control element that performs phase control of AC power, and controls light supply by the power phase control element to perform dimming,
The lighting control unit is connected to the input line to which power supplied from the dimming unit and the AC power supply is input, a rectifier circuit connected to the input line and rectifying a current flowing through the input line, and the rectifier circuit. An output line for outputting the current after rectification to the light emitting diode,
Light emitting diode lighting device comprising the both between the electrodes of the electrodes and between the output line of the input line of the lighting control unit, a resistance and a snubber circuit comprising a capacitor provided respectively.   The light emitting diode lighting device according to claim 1, wherein the power phase control element is a triac.   2. The light emitting diode lighting device according to claim 1, further comprising a switch circuit that short-circuits the resistance of the snubber circuit during a period other than when the main electrode of the power phase control element is turned on.   The light-emitting diode lighting device according to claim 1, further comprising a switch circuit that opens the snubber circuit during a period other than when the main electrode of the power phase control element is turned on.   An input resistor is provided on an input line between the dimming unit and the lighting control unit, an input line between the AC power source and the lighting control unit, or a power line connecting the AC power source and the dimming unit. The light-emitting diode lighting device according to claim 1. A lighting control unit for performing lighting control of the light emitting diode includes an input line to which power supplied from an AC power supply is input, a rectifier circuit connected to the input line and rectifying a current flowing through the input line, and the rectifier circuit And an output line for outputting the rectified current to the light emitting diode.
Light emitting diode lighting device according to claim both between the electrodes of the electrodes and between the output line of the input line, the resistor and a snubber circuit comprising a capacitor provided respectively.

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