JP4995777B2 - LED lighting device, LED lamp, and LED lighting method - Google Patents

Description

  The present invention relates to an LED lighting device, an LED lamp, and an LED lighting method, and more particularly, to a lighting control technique in the case of receiving power supply from a phase control dimmer.

  In recent years, energy saving has been demanded in order to prevent global warming, and in order to meet this demand, LEDs (Light Emitting Diodes) that can achieve higher energy efficiency than conventional incandescent bulbs in the lighting field as well. Has been researched and developed (see, for example, Patent Documents 1 and 2).

  By the way, when it is going to spread and use an LED lamp as a substitute of the conventional incandescent lamp, the response | compatibility to dimming lighting is also needed. A conventional dimmer for an incandescent bulb typically uses a phase control method, and the AC input energy to the incandescent bulb increases or decreases when the user operates the dimming volume. When used in a high temperature atmosphere, a feedback type constant current method is generally used as an LED lighting method, and a constant current, that is, a constant luminous flux is maintained even when the AC input energy is reduced ( For example, an intelligent power device manufactured by Matsushita Electric Industrial Co., Ltd .: MIP55XX). For this reason, a control controller is newly required to vary the luminous flux corresponding to the dimming volume of the dimmer.

Such a control controller requires an operation reference voltage V ₀ (for example, 5 [V]). If the operation reference voltage V ₀ falls below this operation reference voltage V ₀ , the LED lighting operation becomes unstable, and the dimming operation becomes difficult.
In response to the above problems, the LED is turned off during the period corresponding to the missing portion in the AC waveform, and the LED lighting device that performs PWM control in appearance (see, for example, Patent Document 3) or the AC waveform. There has been proposed an LED lighting device (see, for example, Patent Document 4) that changes the pulse width to the LED in accordance with the increase / decrease of the missing portion and maintains the voltage applied to the LED at or above a threshold value.
JP 2008-91140 A JP 2008-103112 A JP 2004-273267 A JP 2006-172820 A

  However, when the LED lighting device proposed in Patent Documents 3 and 4 is used, there is a problem that visual flicker is conspicuous in the LED when the AC input energy is reduced. That is, in the LED lighting device proposed in Patent Documents 3 and 4, the smaller the AC input energy, the wider the interval between pulses applied to the LED, and the longer the LED is off. become longer. For this reason, when these LED lighting devices are used, when the AC input energy decreases, visual flickering becomes noticeable in the LED.

  The present invention has been made to solve such problems, and can save energy by using an LED light source, and also when performing dimming by an existing phase control method, An object of the present invention is to provide an LED lighting device, an LED lamp, and an LED lighting method with less visual flicker.

In order to achieve the above object, the present invention employs the following configuration.
The LED lighting device according to the present invention receives supply of phase-controlled power in a phase control dimmer, converts the supplied power into direct current power, and supplies it to a plurality of LEDs connected in series and parallel. A device for detecting a voltage value of DC power, a control unit for controlling supply of DC power to the LED, a supply destination of DC power, all of the plurality of LEDs, and a plurality of LEDs And a switching unit that switches between some of the LEDs connected in series. Then, the control unit acquires the voltage value (hereinafter referred to as “detected voltage value”) detected by the voltage detection unit, and the detected voltage value and a preset (operation) reference voltage value. And compare.

  In the lighting device according to the present invention, as a result of the comparison, when the detected voltage value is higher than the operation reference voltage value, the control unit instructs the switching unit to supply all of the plurality of LEDs with the DC power supply destination. In addition, all of the plurality of LEDs are turned on by constant current control and supplied with DC power by constant current control (constant current control mode). On the other hand, when the detected voltage value is equal to or less than the operation reference voltage value, the control unit issues a command to the switching unit to set the supply destination of DC power to the some LEDs, and the some LEDs are DC power is supplied and lit by voltage control according to the voltage value of the DC power (voltage control mode).

In addition, the LED lamp according to the present invention receives a plurality of LEDs connected in series and parallel and a phase-controlled power supplied from a phase control dimmer, converts the supplied power into DC power, and converts it into a plurality of LEDs. The lighting device has a lighting device to be supplied. And in the LED lamp which concerns on this invention, the lighting device for LED which concerns on the said this invention is applied as a lighting device.
The LED lighting method according to the present invention converts the phase-controlled power in the phase control dimmer into DC power, and supplies the DC power to a plurality of LEDs connected in series and parallel to drive the LED. It is a lighting method. The LED lighting method according to the present invention includes a voltage value detection step for detecting a voltage value of DC power, a control step for controlling supply of DC power to the LED, and a supply destination of DC power. And a switching step of switching between some of the plurality of LEDs connected in series.

In the control step of the lighting method according to the present invention, the voltage value (detected voltage value) detected in the voltage detecting step is acquired, and the detected voltage value is compared with a preset operation reference voltage value.
In the lighting method according to the present invention, when the detected voltage value is higher than the operation reference voltage value as a result of the comparison, in the switching step, the supply destination of DC power is all of the plurality of LEDs, and all of the plurality of LEDs are Lights by constant current control. On the other hand, when the detected voltage value is equal to or less than the operation reference voltage value, the DC power supply destination is the some LEDs in the switching step, and the some LEDs are voltages corresponding to the DC power voltage values. Turn on by control.

As described above, in the lighting device according to the present invention, the phase-controlled input power is rectified and smoothed and supplied to all or some of the plurality of LEDs. For this reason, when using the lighting device according to the present invention, unlike when supplying pulsating direct current power to the LED, even if the voltage value drops to near the operation start voltage of the LED, visual flickering occurs. There is no.
Further, in the lighting device according to the present invention, the control unit compares the detected voltage value with the operation reference voltage value, and based on the result, the switching unit switches the supply destination of the DC power and lights the LED of the supply destination. Let Here, when lighting all the LEDs, a constant current control method is applied, and when turning on some of the LEDs, a voltage control method according to the voltage value of the DC power is applied. Therefore, the lighting device according to the present invention can realize dimming lighting desirable as an alternative to the incandescent bulb based on the input power controlled by the phase control dimmer.

  In the conventional lighting devices according to Patent Documents 3 and 4, the smaller the AC input energy, the wider the interval between pulses applied to the LED, and the visual flicker becomes conspicuous. On the other hand, the lighting device according to the present invention does not perform the apparent PWM control as in Patent Documents 3 and 4 described above, and even when the AC input energy becomes small as described above, Difficult to cause the above flicker problem.

In addition, since the lighting device according to the present invention is intended for LEDs, energy saving can be achieved as compared with incandescent bulbs.
As described above, the lighting device according to the present invention can save energy by using the LED light source, and there is little visual flicker even when the light control is performed by the existing phase control method.

Since the LED lamp according to the present invention includes the lighting device according to the present invention as the lighting device, the same effect as described above is obtained.
In the LED lighting method according to the present invention, on the basis of the comparison result in the control step, in the switching step, all of the plurality of LEDs and a part of the LEDs connected in series are supplied to the DC power supply destination. Switching is performed, and lighting driving is executed in each of the constant current control mode and the voltage control mode. Therefore, in the lighting method according to the present invention, the same effects as those of the lighting device described above can be achieved.

In the lighting device, the LED lamp, and the lighting method according to the present invention, the following variations can be adopted.
In the lighting device and the LED lamp according to the present invention, a configuration in which the control unit includes a microcomputer circuit and the switching unit includes a multiplexer can be employed. Here, the microcomputer circuit is a circuit that compares the detected voltage value and the reference voltage value, and the multiplexer is based on the comparison result in the microcomputer circuit and selects all of the plurality of LEDs or some of the LEDs. Selectively switch.

In the lighting device and the LED lamp according to the present invention, a normally closed multiplexer can be applied.
Further, the lighting device and the LED lamp according to the present invention employ a configuration in which an LED driver is inserted in the power flow path between the voltage detection unit and the output terminal of the DC power to the LED. be able to. Here, the LED driver selectively executes constant current control and voltage control based on a command from the control unit.

Further, in the lighting device and the LED lamp according to the present invention, the control unit is 3.3 [V] or more, and the number of LEDs connected in series and the value of 1/2 of the rated voltage of the LED A configuration in which a voltage value equal to or less than the product is preset as an operation reference voltage value can be employed.
In addition, in the lighting device and the LED lamp according to the present invention, when the detected voltage value is lower than the operation start voltage of the ED, the control unit outputs a command to stop the supply of DC power to the LED. It is possible to adopt a configuration of performing.

Further, in the LED lamp according to the present invention, a power supply base as a power supply end, a case where the power supply base is joined to the mouth of one end, and the lighting circuit is accommodated inward, and the other case The structure of having a translucent cover that is bonded to the end and covers the plurality of LEDs can be employed.
In the LED lamp according to the present invention, the case is configured by a resin material, or at least one selected from copper, aluminum, and iron, or an alloy including these, or a combination thereof. Can be adopted.

Further, in the LED lamp according to the present invention, an Edison base can be applied as a power supply cap.
In the lighting method according to the present invention, the control step performs constant current control on all of the plurality of LEDs based on the calculation substep for comparing and calculating the detected voltage value and the reference voltage value and the comparison result in the calculation substep. It is possible to adopt a configuration including a constant current control mode for supplying DC power and a mode selection substep for selecting a voltage control mode for supplying DC power to some LEDs by voltage control.

In the lighting method according to the present invention, a control method for selecting a constant current control mode and a voltage control mode based on a comparison result between the detected voltage value and the operation reference voltage value when supplying DC power to the LED. A configuration having a selection step can be employed.
Moreover, in the lighting method according to the present invention, a voltage value that is 3.3 [V] or more and less than or equal to the product of the number of LEDs connected in series and a value that is 1/2 of the rated voltage of the LED is controlled. A configuration of adopting the reference voltage value in the step can be employed.

  Further, in the lighting method according to the present invention, it is possible to employ a configuration in which, in the control step, when the detected voltage value becomes lower than the operation start voltage of the LED, the supply of DC power to the LED is stopped. it can.

Hereinafter, the best mode for carrying out the present invention will be described with reference to an example. The form used in the following description is an example used for easy understanding of the configuration, operation, and effect of the present invention, and the present invention is not limited to the following form except for its essential features. Not receive.
1. Whole structure of LED lamp 1 The whole structure of the LED lamp 1 which concerns on this Embodiment is demonstrated using FIG.

  As shown in FIG. 1, the LED lamp 1 has a glove 30 as a translucent cover, a cylindrical heat sink 20, a funnel-shaped case 40, and an Edison base cap 50, and has an external appearance. Is configured. The LED unit 10 is placed and fixed on the upper surface of the heat sink 20 in the Z-axis direction, and the outside is covered with the inside of the dome-shaped globe 30.

  A lighting circuit 60 is accommodated in the case 40. The lighting circuit 60 is connected to the LED unit 10 by leads 70, and both the poles of the base 50 are connected by leads not shown. The heat sink 20 is formed of, for example, copper (Cu), aluminum (Al), iron (Fe), an alloy thereof, or a resin in which a filler is mixed with them. Thereby, the heat generated from the LED unit 10 by the light emission driving of the LED lamp 1 is transmitted to the heat sink 20 and released to the outside.

2. Configuration of LED Unit 10 Among the components of the LED lamp 1, the configuration of the LED unit 10 as a light source will be described with reference to FIG. 2 is a plan view of the LED unit 10 from the upper side in the Z-axis direction in FIG.
As shown in FIG. 2, the LED unit 10 has a configuration in which twelve LED elements L _{11 to} L ₄₃ are mounted on one main surface of a rectangular substrate 11. The twelve LED elements L _{11 to} L ₄₃ are connected in three and four rows. That is, the LED elements L _{11 to} L ₁₃ , the LED elements L _{21 to} L ₂₃ , the LED elements L _{31 to} L ₃₃ , and the LED elements L _{41 to} L ₄₃ are connected in series, and are connected in parallel to each other. ing.

In the LED unit 10, a group of LED elements L _{11 to} L ₁₃ is connected to the wirings 12 and 13 on the substrate 11, and the remaining LED elements L _{21 to} L ₄₃ are connected to the wirings 13 and 14. Yes. The three leads 70 shown in FIG. 1 are connected to each of the wirings 12 to 14.
3. Circuit Configuration of LED Lamp 1 The circuit configuration of the LED lamp 1 will be described with reference to FIG.

As shown in FIG. 3, AC power from the AC power source 500 is supplied to the base 50 of the LED lamp 1 via a phase control dimmer 510. In other words, the base 50 of the LED lamp 1 is supplied with electric power whose phase is controlled and whose AC input energy is set to a predetermined value by a dimming volume (not shown) in the phase control dimmer 510. Will be.
Two rectifying and smoothing circuits 62 and 63 are connected to the base 50 via a line filter circuit 61. One rectifying / smoothing circuit 62 is connected to the LED driver circuit 64, and the other rectifying / smoothing circuit 63 is connected to the microcomputer circuit 65. A voltage step-down circuit 66 is inserted in the power flow path between the rectifying / smoothing circuit 62 and the LED driver circuit 64, and a signal relating to a voltage value (hereinafter referred to as “detection voltage signal”) is provided from the voltage step-down circuit 66. Is output to the microcomputer circuit 65.

  Further, the microcomputer circuit 65 is configured to output a signal related to light control (hereinafter referred to as “light control signal”) to the LED driver circuit 64. The LED driver circuit 64 is connected to the LED unit 10 via a lead 70 a and also connected to the multiplexer 67. The multiplexer 67 is a normally closed type, and in a steady state, the connection to both the lead 70b and the lead 70c is closed. When the instruction is received from the microcomputer circuit 65, the multiplexer 67 is connected to the lead 70c. While maintaining the closed state, the connection with the lead 70b is opened.

The multiplexer 67 is connected to the LED unit 10 via leads 70b and 70c. In FIG. 3, the reference numeral 70 is not attached, but the lead 70 a is connected to the wiring 12 in the LED unit 10, the lead 70 b is connected to the wiring 14, and the lead 70 c is connected to the wiring 13. (See FIG. 2).
Here, in the two rectifying / smoothing circuits 62 and 63, the rectifying / smoothing circuit 62 is for driving the LED unit 10, and the rectifying / smoothing circuit 63 is for driving the microcomputer circuit 65.
Of the above configuration, the line filter 61 to the multiplexer 67 are housed in the case 40 of the LED lamp 1 as the lighting circuit 60.

4). Operation of Microcomputer Circuit 65 Next, the operation of the microcomputer circuit 65, which is a main feature in the present embodiment, and the light emission drive of the LED lamp 1 associated therewith will be described with reference to FIGS.
As shown in FIG. 4, the microcomputer circuit 65 determines whether or not the detected voltage signal V _X from the voltage step-down circuit 66 is greater than the preset operation reference voltage V ₀ when power is supplied to the LED lamp 1. These are compared (step S1). Here, the operation reference voltage V ₀ is defined as follows, for example.

When the number of LED units 10 connected in parallel is m (= 4) and the minimum reference voltage of one series is V _LOW , the minimum voltage of the command voltage is defined as (V _LOW / m). The operation reference voltage V ₀ is set to the same value as the lowest command voltage (V _LOW / m).
If the microcomputer circuit 65 determines that (V _X > V ₀ ) as a result of the comparison in step S 1 (step S 1: Yes), the microcomputer circuit 65 makes all the LED elements L in the LED unit 10 with respect to the multiplexer 67. _{11 to} L ₄₃ are instructed to maintain the DC power supply path (step S2). Since the multiplexer 67 according to the present embodiment is normally closed (NC), both the leads 70b and 70c are closed until a switching instruction is received from the microcomputer circuit 65, and all the LED elements L ₁₁ are in the closed state. to select the ~L _43.

When the microcomputer circuit 65 determines that (V _X > V ₀ ) (step S1: Yes), the microcomputer circuit unit 65 sends all the LED elements L ₁₁ to L ₁₁ in the LED unit 10 to the LED driver circuit 64. L ₄₃ and outputs a dimming signal to the effect that driven to emit light at a constant current control due to the command voltage (step S3). Accordingly, the LED lamp 1, all 12 of the LED elements _L 11 _{~L 43} in the LED unit 10 is turned on. When the microcomputer circuit 65 determines that (V _X > V ₀ ) in step S1, the microcomputer circuit 65 performs light emission driving in the full lighting (constant current control) mode.

Note that the microcomputer circuit 65 stores in advance a reference table that associates the command voltage with the output currents of the LED elements L _{11 to} L ₄₃ . An example is shown in FIG. The microcomputer circuit 65 refers to the table shown in FIG. 5 and drives the LED elements L _{11 to} L ₄₃ to emit light by constant current control with an output current corresponding to each command voltage.
Returning to FIG. 4, when the microcomputer circuit 65 determines that (V _X ≦ V ₀ ) in Step S <b> 1 (Step S <b> 1: No), the microcomputer circuit 65 determines a part of the LED unit 10 with respect to the multiplexer 67. The LED elements L _{11 to} L ₁₃ are instructed to switch the supply of DC power (step S4). Receiving the instruction, the multiplexer 67 maintains the closed state of the connection with the lead 70c, and executes switching to open the connection with the lead 70b.

Further, when the microcomputer circuit 65 determines that (V _X ≦ V ₀ ) (step S1: No), the LED driver circuit 64 is phase-controlled with some LED elements L _{11 to} L ₁₃ in the LED unit 10. A dimming signal indicating that the light emission is driven by voltage control according to the above is output (step S5).
The microcomputer circuit 65 compares the detected voltage signal _{V X,} the operation start voltages _{V 1} each of the LED elements _L 11 _{~L 43} (step S6), and if it is determined comparison result is the _(V X <V ₁₎ (Step S6: Yes), the power supply to the LED unit 10 is stopped. Conversely, when it is determined that the comparison result is (V _X ≧ V ₁ ) (step S6: No), the process returns to step S1 and continues the operation.

As shown in FIG. 5, even in the case of (V _X ≦ V ₀ ), a part of the LED unit 10 is controlled by voltage control based on phase control based on a reference table preset in the microcomputer circuit 65. The LED elements L _{11 to} L ₁₃ are driven to emit light.
Here, as shown in FIG. 5, in the present embodiment, the operation reference voltage V ₀ and the operation start voltage V ₁ are defined as follows.

Operation reference voltage V ₀ = 3.300 [V]
Operation start voltage V ₁ = 2.300 [V]
Note that the operation reference voltage V ₀ and the operation start voltage V ₁ are appropriately changed depending on the type of the LED element employed.
As shown in FIG. 6, in the light emission drive controlled by the microcomputer circuit 65 as described above, when the detection voltage signal V _X is in the range of 2.300 [V] to 3.300 [V], the 12 LED elements L _{Among the 11 to} L ₄₃ , the three LED elements L _{11 to} L ₁₃ connected in series are driven to light by voltage control based on phase control (all lighting mode). When the detection voltage signal V _X is higher than 3.300 [V], all twelve LED elements L _{11 to} L ₄₃ are lit and driven by constant current control based on the command voltage of the microcomputer circuit 65 (1 Column lighting mode). In the LED lamp 1, a linear light flux change as shown in FIG. 6 is obtained by executing the above-described lighting drive.

5. Superiority The LED lamp 1 according to the present embodiment adopting the above-described configuration and driving configuration has the following advantages.
In the LED lamp 1 according to the present embodiment, the rectifying / smoothing circuit 62 of the lighting circuit 60 rectifies and smoothes the phase-controlled input AC power, and all or a part of the plurality of LED elements L _{11 to} L _43. supplied to the element _L 11 _{~L 13.} For this reason, in the LED lamp 1, unlike the case where pulsating direct current power is supplied to the LED element, even if the voltage value decreases to near the operation start voltage V _{1 of the} LED elements L _{11 to} L ₄₃ due to dimming, No flickering occurs.

In the LED lamp 1, the microcomputer circuit 65 compares the value of the detection voltage signal V _{X with} the value of the operation reference voltage V ₀ , and determines the LED driver circuit 64 and the multiplexer 67 based on the comparison result. A switching instruction is made between lighting driving in the current control mode and lighting driving in the voltage control mode. In the lighting drive in the constant current control mode, all of the plurality of LED elements L _{11 to} L ₄₃ are turned on, and in the lighting drive in the voltage control mode, some of the LED elements L _{11 to} L ₁₃ connected in series are connected. Lights up. Therefore, the LED lamp 1 can realize dimming lighting desirable as an alternative to the incandescent bulb based on the input power controlled by the phase control dimmer for lighting the LED elements L _{11 to} L ₄₃ . Further, the LED lamp 1 does not perform the “apparent PWM control” as disclosed in Patent Documents 3 and 4 described above, and has a problem of visual flicker even when the AC input energy is reduced. It is hard to occur.

Moreover, the LED lamp 1, since the LED element _L 11 _{~L 43} and the light emitting source, energy saving can be achieved than incandescent bulbs.
6). Other Matters The LED lamp 1 according to the above embodiment is an example for easily explaining the configuration, operation, and effect of the present invention, and the present invention is not limited thereto. For example, in the above-described embodiment, a configuration in which the lighting circuit 60 is housed in the case 40 is employed. However, the lighting circuit 60 does not necessarily have to be integrated with the lamp. That is, even when the LED unit 10 and the lighting circuit 60 are separate from each other, the same effect as described above can be obtained by applying the present invention.

Further, in the LED lamp 1 according to the above-described embodiment, a configuration in which the LED unit 10 includes twelve LED elements L _{11 to} L ₄₃ is adopted. It is not limited to. As for the mounting form, for example, a plurality of rows of LED element groups may be configured concentrically.
In the above embodiment, the multiplexer 67 is used for switching the supply path of the DC power to the LED elements L _{11 to} L _43. However, the switching operation can also be executed by switching.

Further, as described above, the table shown in FIG. 5 is shown as an embodiment, and can be appropriately changed depending on the number of LED elements mounted, the characteristics of the LED elements, and the like.
Moreover, in the LED lamp 1 according to the above-described embodiment, the Edison-based base 50 is provided as the power feeding end, but it is not necessarily required to be an Edison-based base. For example, it is possible to adopt a form in which a base having two base pins or a connector extended from the main body by a lead wire is used as a power feeding end.

  Further, the microcomputer circuit 65 of the LED lamp 1 according to the above embodiment can be a one-chip microcomputer, or can be configured by a logic circuit using discrete components.

  INDUSTRIAL APPLICABILITY The present invention is useful for realizing LED lighting capable of natural dimming equivalent to an incandescent bulb corresponding to an existing dimmer while realizing energy saving.

1 is a side view (partially cutaway cross-sectional view) illustrating a configuration of an LED lamp 1 according to an embodiment. FIG. 2 is a plan view showing a configuration of an LED unit 10 in the LED lamp 1. 2 is a block diagram showing a configuration of a lighting circuit 60 in the LED lamp 1. FIG. 5 is a flowchart of an operation executed by a microcomputer circuit 65 in the lighting circuit 60. It is a figure which shows the reference table in the microcomputer circuit. It is a characteristic view which shows the relationship between a voltage and a relative light beam in the light emission operation | movement of the LED lamp. It is a characteristic view which shows the relationship between the forward voltage applied to LED, and the forward current which flows through LED.

Explanation of symbols

1. LED lamp 10. LED unit 11. Substrate 12-14. Substrate lead 20. Heat sink 30. Globe 40. Case 50. Base 60. Lighting circuit 61. Line filter circuit 62, 63. Rectifier smoothing circuit 64. LED driver circuit 65. Microcomputer circuit 66. Voltage drop circuit 67. Multiplexers 70, 70a, 70b, 70c. Lead 500. AC power supply 510. Phase control dimmer L ₁₁ ~L _43. LED element

Claims (15)

LED lighting that is supplied with phase-controlled power in the phase control dimmer, rectifies and smoothes the supplied power, converts it to DC power, and supplies and drives the plurality of LEDs connected in series and parallel. A device,
A voltage detector for detecting a voltage value of the DC power;
A control unit that performs supply control of the DC power to the plurality of LEDs;
A switching unit that switches the supply destination of the DC power between all of the plurality of LEDs and a part of the plurality of LEDs connected in series;
The controller is
The voltage value detected by the voltage detection unit is acquired, the acquired voltage value is compared with a preset reference voltage value,
When the acquired voltage value is higher than the reference voltage, it issues a command to the switching unit to supply all of the plurality of LEDs with the DC power supply destination, and performs constant current control on all the LEDs. Lit by
When the acquired voltage value is equal to or lower than the reference voltage, the switching unit is instructed to supply the DC power to the some LEDs, and the some LEDs are set to the DC power. The lighting device is characterized in that it is lit by voltage control according to the voltage value. The control unit is configured to include a microcomputer circuit that compares and calculates the acquired voltage value and the reference voltage value,
The lighting device according to claim 1, wherein the switching unit includes a multiplexer. The lighting device according to claim 2, wherein the multiplexer is a normally closed type. In the power flow path between the voltage detector and the output terminal of the DC power to the LED,
The lighting device according to any one of claims 1 to 3, wherein an LED driver that selectively executes the constant current control and the voltage control is inserted based on a command from the control unit. . In the control unit, a voltage value that is 3.3 V or more and is equal to or less than the product of the number of LEDs connected in series and a value that is ½ of the rated voltage of the LED is preset as the reference voltage value. The lighting device according to any one of claims 1 to 4, wherein the lighting device is provided. The said control part stops supply of the direct-current power to the said LED, when the acquired said voltage value becomes lower than the operation start voltage of the said LED. The lighting device described. A plurality of LEDs connected in series and parallel and a part or all of the plurality of LEDs are supplied with power controlled in phase by a phase control dimmer, and the supplied power is rectified and smoothed to be converted into DC power. And an LED lamp having a lighting device to be supplied,
An LED lamp, wherein the lighting device according to any one of claims 1 to 4 is applied as the lighting device. A power supply base as a supply end of the power;
A case in which the power supply base is joined to the mouth of one end, and the lighting circuit is housed inside;
The LED lamp according to claim 7, further comprising: a translucent cover that is bonded to the other end of the case and covers the plurality of LEDs. The LED case according to claim 8, wherein the case is made of a resin material, at least one selected from copper, aluminum, and iron, or an alloy including these, or a combination thereof. . The LED lamp according to claim 8 or 9, wherein the power supply base is an Edison base base. A method of lighting an LED that rectifies and smoothes the phase-controlled power in the phase control dimmer, converts the power to DC power, and supplies the DC power to a plurality of LEDs connected in series and parallel to drive lighting,
A voltage value detecting step for detecting a voltage value of the DC power;
A control step for controlling the supply of the DC power to the LED;
A switching step of switching the supply destination of the DC power among all of the plurality of LEDs and a part of the plurality of LEDs connected in series;
In the control step, the voltage value detected in the voltage detection step is acquired, the acquired voltage value is compared with a preset reference voltage value,
When the acquired voltage value is higher than the reference voltage, in the switching step, the supply destination of the DC power is set to all of the plurality of LEDs, and all of the plurality of LEDs are turned on by constant current control. ,
When the acquired voltage value is equal to or lower than the reference voltage, the DC power supply destination is the some LED in the switching step, and the some LED is in accordance with the DC power voltage value. A lighting method characterized by lighting with controlled voltage. The control step includes
A calculation sub-step for comparing and calculating the acquired voltage value and the reference voltage value;
Based on the comparison result in the calculation sub-step, a constant current control mode in which all of the plurality of LEDs are supplied with the DC power by constant current control, and a voltage for supplying the DC power by voltage control of some of the LEDs. The lighting method according to claim 11, further comprising: a mode selection sub-step for selecting a control mode. When supplying the DC power to the LED,
The control method selection step of selecting the constant current control and the voltage control based on a comparison result between the acquired voltage value and the preset reference voltage value. 12. The lighting method according to 12. In the control step, a voltage value that is 3.3 V or more and is equal to or less than the product of the number of LEDs connected in series and a value that is ½ of the rated voltage of the LED is adopted as the reference voltage value. The lighting method according to claim 11, wherein: The said control step stops supply of the DC power to the said LED, when the acquired voltage value becomes lower than the operation start voltage of the said LED. The lighting method described.

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