JP2011171116A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of prolonging a life, and capable of restraining an effect caused by fluctuation of a load state, i.e. capable of reducing flickering. <P>SOLUTION: The lighting device illuminated by a commercial alternating current electric power supply includes the first light emitting unit 41 having a plurality of the first light emitting diodes, and making the plurality of the first light emitting diodes turn on using alternating current electric power received from the alternating current electric power supply, and the second light emitting unit 42 having a plurality of the second light emitting diodes connected in parallel to the first light emitting unit, and a phase shifter C1 for changing a phase of the alternating current electric power received from the alternating current electric power supply, and for output of the phase-changed alternating current electric power toward the second light emitting diodes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device.

  In recent years, light emitting diodes (LEDs) have begun to be introduced into lighting devices (for example, see Patent Document 1). As a lighting device for such an illuminating device, an LED lighting device having a rectifying circuit that rectifies an AC power source to obtain a pulsating flow and a smoothing circuit that smoothes the pulsating flow obtained by the rectifying circuit is known. (For example, refer to Patent Document 2). The rectifier circuit and the smoothing circuit in this LED lighting device function as a DC power supply device, and the smoothing circuit requires a large-capacity capacitor for suppressing voltage fluctuation due to the AC power supply supplied to the rectifier circuit. . As a large-capacity capacitor used in the smoothing circuit, an electrolytic capacitor (chemical capacitor) is widely used. However, when the electrolytic capacitor is used for a long time, the ESR (equivalent series resistance) increases, the electrolyte solution is dried up, the loss increases, and smoke may be generated. As a result, even if a long-life light emitting diode is used in the lighting device, replacement is necessary depending on the lifetime of the capacitor.

  A ceramic capacitor is known as a capacitor having negligible change over time as compared with an electrolytic capacitor. However, a ceramic capacitor has a smaller capacity than an electrolytic capacitor. For this reason, even if it is going to use a ceramic capacitor for a smoothing circuit, a required capacity | capacitance cannot be satisfy | filled with the number of arrangement | positioning permitted with the illuminating device of a practical structure.

International Publication No. 01/045470 Pamphlet JP 2009-038954 A

  However, if the smoothing circuit is removed from the DC power supply device, flickering occurs because a pulsating flow is supplied to the light emitting diode.

  Here, for example, in the lighting device, a first rectifier circuit that is connected to a commercial AC power source and obtains a pulsating current, and is connected to the commercial AC power source via a phase shift circuit to obtain a phase difference. And a second pulsating circuit for generating a pulsating flow having an LED, and an LED connected to both the first rectifying circuit and the second pulsating circuit for combining and receiving the electric power supplied from both. Conceivable. In this configuration, when the phase of the power supplied from the first pulsating circuit and the phase of the power supplied from the second rectifier circuit are, for example, 90 °, these two powers are combined. It is considered that the fluctuation component of the pulsating flow is suppressed and the flickering of the light emission of the LED is suppressed.

  However, the load state of the LED differs greatly between the steady state and immediately after lighting, and also varies depending on the temperature condition. When the load state fluctuates, the phase difference between the power from the first rectifier circuit and the power from the second rectifier circuit may fluctuate and deviate from a complementary phase relationship. In this case, there is an inconvenience that the peak value of the voltage after synthesis increases, and the change width of the light emission luminance of the light emitting diode increases. In order to suppress the change width of the luminance due to the variation in the phase difference, a countermeasure circuit is required, which increases the cost.

  An object of the present invention is to solve the above-mentioned problems, to provide a lighting device that has a long life and is less affected by fluctuations in load conditions.

The illumination device of the present invention that achieves the above object is an illumination device that illuminates with a commercial AC power source,
A first light-emitting unit having a plurality of first light-emitting diodes and lighting the plurality of first light-emitting diodes using AC power received from the AC power source;
The first light emitting unit is a second light emitting unit connected in parallel, and a plurality of second light emitting diodes and an alternating current whose phase is changed by changing the phase of the AC power received from the AC power source. And a second light-emitting unit having a phase shifter that outputs electric power toward the second light-emitting diode.

  In the lighting device of the present invention, the second light emitting diode of the second light emitting unit receives power having a phase different from the phase of the power received by the first light emitting diode, and therefore has a phase period different from that of the first light emitting diode. Flashes on. Therefore, the flickering caused by the supplied AC power is suppressed in the illumination light in which the light emitted by the first light emitting diode and the light emitted by the second light emitting diode are optically combined. When a capacitor is used as a phase shifter for changing the phase, a ceramic capacitor can be used because the capacitance of the capacitor is smaller than that for smoothing. For this reason, the illuminating device of the present invention does not require the use of a smoothing electrolytic capacitor, thus extending the life. Further, according to the illumination device of the present invention, the light emitted by the first light emitting diode and the light emitted by the second light emitting diode are optically combined, so that the phase relationship fluctuates due to load fluctuations of the light emitting diode. However, the fluctuations in brightness are not noticeable. Therefore, the influence due to the fluctuation of the load state can be suppressed.

Here, in the lighting device of the present invention,
The first light emitting unit includes a first rectifier circuit that converts alternating current power of the alternating current power source into pulsating power and supplies the pulsating power to the plurality of first light emitting diodes.
The second light-emitting unit includes a second rectifier circuit that converts alternating-current power whose phase has been changed by the phase shifter into pulsating power and supplies the pulsating power to the plurality of second light-emitting diodes. Preferably there is.

  Since the power converted into the pulsating power by the rectifier circuit is supplied to the light emitting diodes, the light emission efficiency per number of the light emitting diodes is increased.

In the lighting device of the present invention,
The plurality of first light emitting diodes are connected in series with each other,
The plurality of second light emitting diodes includes a plurality of groups connected in series every predetermined number, and the plurality of groups are connected in parallel.
The second light emitting unit preferably includes a voltage drop circuit that drops the pulsating power output from the second rectifier circuit and supplies the pulsating power to the plurality of second light emitting diodes.

  Since the second light emitting unit is a group in which a plurality of groups connected in series is connected in parallel, the second light emitting unit is compared with the first light emitting unit having the first light emitting diodes connected in series. The amount of current is large. For this reason, it is easy to adjust the phase by the second light emitting diode and the capacitor to a phase that is complementary to the first light emitting diode.

  In the lighting device of the present invention, it is preferable that the plurality of first light emitting diodes and the plurality of second light emitting diodes are arranged so as to penetrate each other to form one lighting body as a whole. .

  A single illuminating body emits illumination light with reduced flickering, which is a combination of the light emitted from the first light emitting diode and the light emitted from the second light emitting diode.

  As described above, according to the present invention, it is possible to realize a lighting device that has a long life and is less affected by fluctuations in the load state.

It is a block diagram which shows 1st Embodiment of the illuminating device of this invention. It is a circuit diagram of the 1st Example which shows the more concrete structural example of the illuminating device 1 shown in FIG. It is a circuit diagram of the 1st Example which shows the more concrete structural example of the illuminating device 1 shown in FIG. It is a circuit diagram which shows the illuminating device of the reference example which made phase difference larger. It is a figure which shows the voltage and electric current waveform in each part of the illuminating device of the reference example shown in FIG. It is a circuit diagram which shows the illuminating device of the 2nd Example which made phase difference larger. It is a figure which shows the voltage and electric current waveform in each part of the illuminating device shown in FIG. It is a perspective view which shows the external appearance of the illuminating device shown in FIG. It is a figure explaining the arrangement | positioning variation of LED different from FIG. It is a figure explaining the arrangement | positioning variation of LED different from FIG. It is a figure explaining the arrangement | positioning variation of LED different from FIG. It is a block diagram which shows 2nd Embodiment of the illuminating device of this invention. It is a block diagram which shows 3rd Embodiment of the illuminating device of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

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

  The lighting device 1 shown in FIG. 1 is a device that illuminates with electric power from a commercial AC power source E. The illuminating device 1 includes a first light emitting unit 11 and a second light emitting unit 12, and the first light emitting unit 11 and the second light emitting unit 12 are connected in parallel to the AC power source E. Yes.

  The first light emitting unit 11 includes a first rectifier circuit D1 and a first LED unit ZL1 that is an electrical load. The first rectifier circuit D1 in the first light emitting unit 11 converts the AC power of the AC power source E into pulsating power and supplies it to the light emitting LED unit ZL1, and the first LED unit ZL1 is supplied with this. It emits light when it is driven with high power.

  The second light emitting unit 12 includes a phase shifter φ1, a second rectifier circuit D2, and a second LED unit ZL2. The phase shifter φ1 in the second light emitting unit 12 changes the phase of the AC power received from the AC power supply E, and outputs the AC power whose phase has been changed toward the second light emitting LED unit ZL2. The phase shifter φ1 is, for example, a capacitor connected in series to the AC power supply E, but an inductor can also be used. The second rectifier circuit D2 converts AC power whose phase has been changed by the phase shifter φ1 into pulsating power and supplies it to the second LED unit ZL2. The second LED unit ZL2 is driven by the supplied power to emit light.

  Since each of the first LED unit ZL1 and the second LED unit ZL2 emits light by a non-smoothed pulsating flow, the brightness of the emitted light also changes according to the waveform of the pulsating flow. More specifically, each of the LED portions Zl1 and ZL2 repeats blinking. However, a phase difference is caused by the phase shifter φ1 between the pulsating flow supplied to the first LED unit ZL1 and the pulsating flow supplied to the second LED unit ZL2. For this reason, the 1st LED part ZL1 and the 2nd LED part ZL2 blink with the period of a mutually different phase. That is, the blinking timings are shifted from each other. Therefore, the illumination light obtained by optically synthesizing the light emitted from the first LED unit ZL1 and the light emitted from the second LED unit ZL2 has a higher frequency than the alternating current of the AC power supply E, and is phase-shifted. Flickering can be suppressed compared to the configuration without the vessel φ. In addition, when a capacitor is used as the phase shifter φ, the capacitor for changing the phase in the phase shifter φ is smaller than the capacity for smoothing, so a ceramic capacitor is used instead of an electrolytic capacitor. Is possible. Therefore, the lighting device 1 has a longer life than a lighting device using a smoothing electrolytic capacitor.

  FIG. 2 is a circuit diagram of the first embodiment showing a more specific configuration example of the illumination device 1 shown in FIG.

  The illuminating device 2 shown in FIG. 2 receives illumination from an AC power supply E that outputs an AC voltage of 100 V and emits illumination light. The lighting device 2 includes a first light emitting unit 21 and a second light emitting unit 22. The first light emitting unit 21 includes a first rectifier circuit D1, a current control circuit RG1, and a first LED unit ZL1. The second light emitting unit 22 includes a capacitor connected in series with the AC power supply E as the phase shifter C1, and, similarly to the first light emitting unit 21, the second rectifier circuit D2 and the current control circuit RG2 And a second LED unit ZL2.

  Each of the first rectifier circuit D1 and the second rectifier circuit D2 has a diode bridge composed of four diodes, and each of the first rectifier circuit D1 and the second rectifier circuit D2 by full-wave rectification. Is converted into a pulsating flow having a cycle twice that of the alternating current. For example, when the frequency of the AC supplied from the AC power supply E is 50 Hz, each of the first rectifier circuit D1 and the second rectifier circuit D2 outputs a pulsating flow having a frequency of 100 Hz. Each of the first LED unit ZL1 and the second LED unit ZL2 has 30 LEDs connected in series. The current control circuits RG1 and RG2 are circuits that control the current flowing through the LED, and are resistors, for example. However, a very large current flows through the LED in a transient state immediately after the power is turned on until the LED is turned on. Further, the current flowing through the LED fluctuates due to a change in internal resistance caused by a temperature change. It is more preferable that the current control circuits RG1 and RG2 have a known current limiting circuit (limiter) that limits the current so that the amount of current does not exceed a predetermined rated value.

  For example, when the rated current of each LED is 10 mA and the forward voltage Vf is 2 V, the current control circuits RG1 and RG2 control the current flowing through the LED section composed of 30 LEDs connected in series to 10 mA. The voltage drop in the current control circuits RG1, RG2 is 40V.

  The phase shifter C1 of the second light emitting unit 22 is a ceramic capacitor, and changes the phase of the AC power received from the AC power supply and supplies it to the second rectifier circuit D2. The capacitance of the capacitor is, for example, 2.2 μF, and a ceramic capacitor can be used instead of an electrolytic capacitor if the capacitance is about this level.

  FIG. 3 is a diagram illustrating voltage / current waveforms in each part of the illumination device illustrated in FIG. 2. FIG. 3 shows, in order from the top, the output voltage of the point X, that is, the AC power supply E, the point Y, that is, the first rectifier circuit D1, and the point Z, that is, the output voltage of the second rectifier circuit D2, and the point Y, that is, the first rectifier circuit. The output current of D1 and the output current of point Z, that is, the second rectifier circuit D2, are shown.

As shown in FIG. 3, the voltage at the point Y and the point Z is obtained by full-wave rectifying the waveform of the voltage at the point X. Further, the phase of the current at the point Y in the first light emitting unit 21 matches the phase of the voltage at the point Y. On the other hand, the phase of the current at the Z point in the second light emitting unit 22 is advanced compared to the phase of the current at the Y point. The advance phase angle θ is calculated as follows when the rated current of the LED is 10 mA, the forward voltage Vf is 2 V, and the AC frequency of the AC power supply E is 50 Hz.
・ Actual resistance of the second LED unit ZL2 60V / 10mA = 6000Ω
C1 reactance 1 / (2 × 3.14 × 50 Hz × 2.2F × 10 ⁻⁶ ) = 1447.6Ω
Therefore, the phase angle θ
tan ⁻¹ (1447.6 / 6000) = 13.6 deg
Therefore, in the illuminating device 2 shown in FIG. 2, the change in the light emission luminance of the second LED unit ZL2 is 13.6 ° ahead of the change in the light emission luminance of the first LED unit ZL1. Although the phase difference of the change is 13.6 °, the points where the luminance becomes 0 are shifted from each other, so the combined light of the light emitted from the first LED unit ZL1 and the light emitted from the second LED unit ZL2 flickers. Is reduced.

  Here, reference examples and examples in which the phase difference between the light emission of the two LED units is made larger will be described.

  FIG. 4 is a circuit diagram showing a lighting apparatus of a reference example in which the phase difference is further increased.

  The illumination device 3 of the reference example shown in FIG. 4 is composed of six LEDs in which the second LED portion ZL32 is connected in series as compared with the illumination device 2 of the first embodiment shown in FIG. The difference is that a voltage limiting circuit RG32 is provided instead of the control circuit RG2, and the remaining configuration is the same as that of the illumination device 2 shown in FIG. The same elements as those in the illumination device 2 shown in FIG.

  In the second LED unit ZL32 in this reference example, the number of LEDs connected in series is 6, and the voltage supplied to the second LED unit ZL32 reaches 12V and reaches the rating of each LED.

  The voltage limiting circuit RG32 lowers the maximum value of the voltage output to the second LED unit ZL32 in order to set the LED current to the rated value. More specifically, the voltage limiting circuit RG32 is a circuit that slices and outputs the voltage waveform of the pulsating current supplied from the second rectifier circuit D2 with a predetermined voltage. More specifically, for the portion of the pulsating current supplied from the second rectifier circuit D2, the voltage exceeds 12V, 12V is output to the second LED unit ZL32. As the voltage limiting circuit RG32, for example, a regulator that feeds back a power corresponding to a voltage exceeding 12 V to the input side as a reactive current is preferable. If a DC-DC converter such as a switching regulator is used as the voltage limiting circuit RG32, the actual resistance of the second LEDZL unit 32 increases (100V / 12V) times as will be described later, and does not contribute to an increase in phase angle. Because. The voltage control circuit corresponds to an example of a voltage drop circuit referred to in the present invention.

  FIG. 5 is a diagram showing voltage / current waveforms in each part of the illumination device of the reference example shown in FIG. FIG. 5 shows, in order from the top, the X point, that is, the output voltage of the AC power supply E, the Y point, that is, the first rectifier circuit D1, and the Z point, that is, the output voltage of the second rectifier circuit D2, and the Y point, that is, the first rectifier circuit. The output current of D1 and the output current of point Z, that is, the second rectifier circuit D2, are shown.

As shown in FIG. 5, the phase of the current at the Z point in the second light emitting unit 32 is advanced compared to the phase of the current at the Y point, that is, the phase of the voltage at the Z point. The advance phase angle θ is calculated as follows.
・ Actual resistance of the second LED unit ZL32 12V / 10mA = 1200Ω
C1 reactance 1 / (2 × 3.14 × 50 Hz × 2.2F × 10 ⁻⁶ ) = 1447.6Ω
Therefore, the phase angle θ
tan ^-1 (1447.6 / 1200) = 50.3 deg
Therefore, in the illumination device 3 of the reference example shown in FIG. 4, the change in the light emission luminance of the second LED unit ZL32 is advanced by 50.3 ° from the change in the light emission luminance of the first LED unit ZL1. Since the phase difference of the change is closer to 90 ° than the illumination device 2 of the first embodiment shown in FIG. 2, the point at which the luminance becomes 0 and the timing at which the peak is reached are more evenly distributed.

  However, in the lighting device 3 of the reference example shown in FIG. 4, the first LED unit ZL1 has 30 LEDs, whereas the second LED unit ZL32 has 6 LEDs. Will not improve.

  FIG. 6 is a circuit diagram showing the illumination apparatus of the second embodiment with a larger phase difference.

  The illumination device 4 shown in FIG. 6 includes a connection configuration of the second LED unit ZL42 and a voltage limiting circuit RG42 instead of the current control circuit RG2, as compared with the illumination device 2 of the first embodiment shown in FIG. The remaining structure is the same as that of the illuminating device 2 shown in FIG. The same elements as those in the illumination device 2 shown in FIG.

  The second LED unit ZL42 in the second embodiment is composed of the same 30 LEDs as the first LED unit ZL1. However, the second LED unit ZL42 has five groups in which every six LEDs are connected in series, and the five groups are connected in parallel.

  The number of LEDs connected in series in the second LED unit 42 is six. In order to set the LED current to the rated value, the maximum value of the voltage output by the voltage limiting circuit RG42 is limited to 12V. Since the specific configuration of the voltage limiting circuit RG42 is the same as that of the voltage limiting circuit RG32 of the reference example described above, further description is omitted.

  FIG. 7 is a diagram showing voltage / current waveforms in each part of the illumination device shown in FIG. In FIG. 7, in order from the top, the output voltage of the point X, that is, the AC power supply E, the point Y, that is, the first rectifier circuit D1, and the point Z, that is, the output voltage of the second rectifier circuit D2, the point Y, that is, the first rectifier circuit. The output current of D1 and the output current of point Z, that is, the second rectifier circuit D2, are shown.

As shown in FIG. 7, the phase of the current at the point Z in the second light emitting unit 42 is ahead of the phase of the current at the point Y, that is, the phase of the voltage at the point Z. The advance phase angle θ is calculated as follows.
・ Actual resistance of the second LED unit ZL42 12V / 10mA / 5 = 240Ω
C1 reactance 1 / (2 × 3.14 × 50 Hz × 2.2F × 10 ⁻⁶ ) = 1447.6Ω
Therefore, the phase angle θ
tan ⁻¹ (1447.6 / 240) = 80.6 deg
Therefore, in the illumination device 4 of the reference example shown in FIG. 6, the change in the light emission luminance of the second LED unit ZL42 is 80.6 ° ahead of the change in the light emission luminance of the first LED unit ZL1. Since the phase difference of the change is closer to 90 ° than the lighting device 2 of the first embodiment and the lighting device 3 of the reference example shown in FIG. 2, the points where the luminance becomes 0 and the peak points are more evenly distributed. To do. That is, the first LED unit ZL1 and the second LED unit ZL2 blink alternately at a more uniform time interval. For this reason, flickering is reduced in the combined light of the light emitted from the first LED unit ZL1 and the light emitted from the second LED unit ZL2.

  In the illuminating device of each Example mentioned above, the flicker of the synthetic light with which the emitted light of the 1st LED part and the emitted light of the 2nd LED part were synthesize | combined is suppressed. Since the capacity of the capacitor as a phase shifter is small, a ceramic capacitor having a long life can be used as compared with an electrolytic capacitor having a large capacity but a short life. In addition, since the synthesis of energy with different phases is performed optically rather than electrically, for example, the phase relationship of the waveforms supplied to the first LED unit and the second LED unit due to environmental changes or changes over time Even if fluctuates, flickering can be suppressed and a situation where the voltage applied to the LED becomes excessive and the lifetime is shortened can be avoided.

  In the above-described embodiment, the number of LEDs constituting the LED portion is described as 30. However, the number of light-emitting diodes referred to in the present invention may be less than 30 or more than 30. Further, although the capacitance value of the capacitor has been described as 2.2 μF, the capacitance value is appropriately adjusted according to the voltage value of the power supply, the characteristics of the LED, the number of LEDs, and the number.

  Next, each shape of the lighting device will be described.

  FIG. 8 is a perspective view showing an appearance of the illumination device shown in FIG.

  The illuminating device 4 shown in FIG. 8 forms an incandescent bulb-like illuminating body, and has a metal cap 45 similar to that of the incandescent bulb. The illuminating device 4 shown in FIG. 8 obtains commercial AC power from the metal cap 45 by attaching it to a general light bulb socket instead of an incandescent light bulb. The lighting device 4 includes LEDs 401 and 402 and a circuit board 46. The LEDs 401 and 402 are arranged in a row in a row on the opposite side of the metal cap 45. The LEDs 401 and 402 are arranged such that the LED 401 constituting the first LED portion ZL1 shown in FIG. 6 and the LED 402 constituting the second LED portion ZL42 enter each other. FIG. 8 schematically shows the arrangement of the LEDs, but actually, the LED 401 and the LED 402 are arranged in a total of 60, 30 each. On the circuit board 46, the phase shifter C1, the first rectifier circuit D1, the second rectifier circuit D2, the first LED unit ZL1, and the voltage limiter circuit RG42 shown in FIG. 6 are mounted. In the illuminating device 4 shown in FIG. 8, flickering is reduced because the LEDs 401 configuring the first LED unit ZL1 and the LEDs 402 configuring the second LED unit ZL42 are alternately arranged. Of course, the circuit board 45 and the LED fixing board may be integrated.

  Although FIG. 8 shows an example in which LEDs are arranged in a row in a ring shape, the LED arrangement is not limited to this.

  9, FIG. 10, and FIG. 11 are diagrams for explaining LED arrangement variations different from those in FIG.

  In the arrangement example shown in FIG. 9, the LED 501 constituting the first LED portion ZL1 (see FIG. 6) and the LED 502 constituting the second LED portion ZL42 (see FIG. 6) are linear on the circuit board 51. On top of each other, they are arranged in a row. The LED 501 and the LED 502 are connected in series by a conductor pattern.

  In the arrangement example shown in FIG. 10, the LED 601 constituting the first LED unit ZL1 (see FIG. 6) and the LED 602 constituting the second LED unit ZL42 (see FIG. 6) enter each other on two concentric circles. Is arranged in.

  In the arrangement example shown in FIG. 11, the LED 701 constituting the first LED portion ZL1 (see FIG. 6) and the LED 702 constituting the second LED portion ZL42 (see FIG. 6) are on the lattice points on the plane. It is arranged. The LED 701 and the LED 702 are arranged so as to enter each other like a checkered pattern.

  In the embodiments and examples described so far, the lighting device including the second light emitting unit having the capacitor as the phase shifter and the first light emitting unit not having the phase shifter has been described. Then, 2nd Embodiment provided with three light emission parts containing the light emission part provided with the inductor as a transfer device is described.

  FIG. 12 is a block diagram showing a second embodiment of the illumination device of the present invention.

  The lighting device 8 shown in FIG. 12 includes a third light emitting unit 83 in addition to the first light emitting unit 81 and the second light emitting unit 82, and the first light emitting unit 11 and the second light emitting unit 12. The third light emitting unit 83 is connected in parallel to the AC power source E. Of the lighting device 8, the portions of the first light emitting unit 81 and the second light emitting unit 82 are the same as those of the lighting device 4 shown in FIG. 8. However, the second light emitting unit 82 of the illumination device 8 shown in FIG. 12 is different from the second light emitting unit 42 of the illumination device 4 shown in FIG. 8 in the capacitance of the capacitor C8.

  The third light emitting unit 83 illustrated in FIG. 8 includes an inductor L8 as a phase shifter. In the second light emitting unit 82, the phase of the light emission luminance change of the LED is advanced due to the capacitor C8, whereas in the third light emitting unit 83, the phase of the light emission luminance change of the LED is delayed due to the inductor L8. . In the illumination device 8, the capacitance value of the capacitor C8 and the inductance value of the inductor L8 are such that the phase of light emission of the LED of the second light emitting unit 82 is advanced by about 60 ° from the phase of light emission of the LED of the first light emitting unit 81, In addition, the phase of light emission of the LED of the third light emitting unit 83 is set to a value that is delayed by about 60 ° from the phase of light emission of the LED of the first light emitting unit 81.

  According to the illuminating device 8 shown in FIG. 12, the frequency of the luminance change of the light synthesized from the light emitted from the LEDs of the light emitting units 81, 82, 83 is further increased, and flickering is suppressed.

  In the embodiments and examples described so far, the lighting device including the diode bridge as the rectifier circuit has been described. Subsequently, the third embodiment having no rectifier circuit will be described.

  FIG. 13 is a block diagram showing a third embodiment of the illumination device of the present invention.

  The illumination device 9 shown in FIG. 13 includes a first light emitting unit 91 and a second light emitting unit 92. The first light emitting unit 91 is not provided with a diode bridge. The light-emitting diode unit ZL91 of the first light-emitting unit 91 has two LED groups 911 and 922, and each of the LED groups 911 and 922 includes LEDs connected in series. The two LED groups 911 and 922 are connected in parallel so that the polarities are reversed. When alternating current is supplied to the first diode unit ZL91, one of the two LED groups emits light during the half period of the alternating current cycle, and the other emits light during the remaining half period. This configuration is the same for the two LED groups 921 and 922 included in the light emitting diode unit ZL92 of the second light emitting unit 92.

  Further, in FIGS. 12 and 13, etc., the LEDs of the third group and the fourth group are alternately lit, so that the LEDs of each group are arranged at almost equal intervals and layout as described with reference to FIGS. Can be easily guessed.

1,2,4,8,9 Illumination device 11,21,41,81,91 1st light emission part 12,22,42,82,92 2nd light emission part 911,922 Group of LED φ1, C1, C8 Phase shifter D1 1st rectifier circuit D2 2nd rectifier circuit L8 Inductor ZL1, ZL91 1st LED part (multiple LED)
ZL2, ZL42, ZL92 Second LED unit (multiple LEDs)

Claims (4)

A lighting device that illuminates with a commercial AC power source,
A first light-emitting unit having a plurality of first light-emitting diodes and lighting the plurality of first light-emitting diodes using AC power received from the AC power source;
The first light emitting unit is a second light emitting unit connected in parallel, and a plurality of second light emitting diodes and an alternating current whose phase is changed by changing the phase of the AC power received from the AC power source. A lighting device comprising: a second light emitting unit including a phase shifter that outputs electric power toward the second light emitting diode. The first light emitting unit includes a first rectifier circuit that converts AC power of the AC power source into pulsating power and supplies the pulsating power to the plurality of first light emitting diodes.
The second light emitting unit includes a second rectifier circuit that converts AC power whose phase has been changed by the phase shifter into pulsating power and supplies the pulsating power to the plurality of second light emitting diodes. The lighting device according to claim 1, wherein the lighting device is provided. The plurality of first light emitting diodes are connected in series with each other,
The plurality of second light emitting diodes form a plurality of groups connected in series every predetermined number, and the plurality of groups are connected in parallel,
The second light-emitting unit includes a voltage drop circuit that drops the pulsating power output from the second rectifier circuit and supplies the pulsating power to the plurality of second light-emitting diodes. Lighting equipment.   The plurality of first light emitting diodes and the plurality of second light emitting diodes are arranged so as to penetrate each other to form one illuminating body as a whole. The lighting device according to item.

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