LED light bulb and its control method

Abstract

This invention provides an LED bulb and a control method that, in response to dimming by existing phase-controlled dimming equipment, can control the LED element and filament lamp to reproduce a color temperature closer to that of an incandescent bulb. [Solution] The LED bulb 1 comprises a light bulb housing 10, an LED phase dimming detection circuit 21 mounted on the light bulb housing 10, an LED power supply circuit 22 for main illumination, a filament phase dimming detection circuit 30, a filament power supply circuit 31 for corrective illumination, an LED element 2 for main illumination mounted on the light bulb housing 10, and a filament lamp 3 for corrective illumination mounted on the light bulb housing 10. The filament phase dimming detection circuit 30 and the filament power supply circuit 31 control the filament lamp 3 to maximize its illuminance when the LED element 2 for main illumination is not lit or is in a dimming range of low illuminance.

Description

Technical Field

[0001] The present invention relates to an LED bulb equipped with a filament lamp, and particularly to an LED bulb that adds the illumination of the filament lamp to LED lighting and can correct the color temperature for each dimming level, and a control method thereof.

Background Art

[0002] In the case of a lighting device using a conventional LED element, as shown in FIG. 8(b), when an existing dimming device for an incandescent bulb is used, it often does not light at a very low dimming level and starts to light when it reaches a certain dimming level. Different from the dimming operation of a conventional incandescent bulb, there are cases where a sense of discomfort is felt. Furthermore, tungsten of the filament has a characteristic that the color temperature difference between the rated voltage and a low voltage close to lighting or extinguishing is larger compared to an LED element.

[0003] Compared to a filament lamp, an LED element has a characteristic that when the input voltage changes by controlling the light amount, the light amount changes greatly, but the change in color temperature is not significant. Particularly for stage and theater lighting, instead of the abrupt lighting and extinguishing of an LED element and the monotonous change in color temperature accompanying the change in light amount, a natural and large change in color temperature accompanying the change in light amount, which is the same as that of a conventional incandescent bulb, is required for the visual effect in the performance.

[0004] As a technology for combining a light-emitting element such as an incandescent lamp with a light-emitting diode, for example, Patent Document 1 (Japanese Patent No. 4340288) describes a light bulb comprising: a base configured to be fitted into a light bulb socket; a light-emitting element attached to the base, selected from the group consisting of a small fluorescent lamp, an incandescent lamp, a halogen lamp, and a low-pressure mercury light-emitting element; a plurality of light-emitting diodes attached to the base, each emitting light of a different color; a control circuit that, when the base is attached, supplies power from the light bulb socket to the light-emitting element and the plurality of light-emitting diodes; and a translucent housing attached to the base, housing the light-emitting element and the plurality of light-emitting diodes, wherein the control circuit individually controls each of the plurality of light-emitting diodes to control at least one of the perceived color and intensity of the light emitted from the plurality of light-emitting diodes, and a processor that controls the control circuit to control the plurality of light-emitting diodes and to form at least one predetermined presentation of light emission, wherein the presentation changes at least one of the perceived color and intensity of the light emitted from the housing by the plurality of light-emitting diodes during the presentation.

[0005] Furthermore, Patent Document 2 (International Publication No. 2014 / 119313) describes a light-emitting device that comprises at least a first white light source that emits a first white light having a first color temperature, and a second white light source that emits a second white light having a second color temperature higher than the first color temperature, and emits a mixed white light of the first white light and the second white light, wherein the color temperature of the mixed white light is lower as the emission intensity of the mixed white light decreases. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 4340288 [Patent Document 2] International Publication No. 2014 / 119313 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, in the light bulb described in Patent Document 1, the primary illumination is provided by the light-emitting element, such as an incandescent lamp, and multiple light-emitting diodes arranged around the light-emitting element add functions including coloring, color change, and light shows. The light-emitting element, which is the primary illumination, has the disadvantage of consuming more power and having a shorter lifespan than light-emitting diodes (LED elements). Patent Document 1 does not show a technology that can be controlled without any discomfort by an existing dimmer for incandescent light bulbs, or a technology that brings the color temperature change of the light-emitting diode for primary illumination, which is subject to dimmer control, closer to that of an incandescent light bulb.

[0008] Furthermore, Patent Document 2 describes a technique in which the mixed white light of the first white light from the first white light source and the second white light from the second white light source has a lower color temperature as the luminescence intensity decreases, thereby bringing the change in color temperature when dimming is controlled closer to that of an incandescent light bulb. However, because the light source only has LEDs, when the light intensity is controlled, the property remains that it does not light up at a very low dimming level, but lights up when a certain level of dimming is reached. This could cause an unnatural feeling in the timing of lighting up and turning off in existing phase-controlled dimming equipment designed for incandescent light bulbs.

[0009] In view of these circumstances, the present invention reproduces a color temperature closer to that of an incandescent light bulb when dimmed by an existing phase-controlled dimming system. When the LED element, which is subject to weak dimming control, is not lit due to low voltage, the filament lamp is lit, reproducing the color temperature change characteristic of a filament lamp. When dimmed by an existing phase-controlled dimming system, the LED element and the filament lamp can each be controlled to reproduce a color temperature closer to that of an incandescent light bulb. The present invention aims to provide an LED light bulb and a control method thereof that can be equipped with multiple filament lamps with different characteristics and can be dimmed according to the characteristics of each filament lamp. [Means for solving the problem]

[0010] The present invention provides an LED bulb comprising: a light bulb housing; an LED phase dimming detection circuit mounted in the light bulb housing that receives a phase-dimmed DC power source and detects an LED dimming signal; an LED power supply circuit for main illumination mounted in the light bulb housing that controls the power source based on the LED dimming signal; a filament phase dimming detection circuit mounted in the light bulb housing that receives the power source and detects a filament dimming signal; a filament power supply circuit for corrective illumination mounted in the light bulb housing that receives the filament dimming signal and controls the power source; one or more LED elements for main illumination mounted in the light bulb housing and connected to the LED power supply circuit; and one or more filament lamps for corrective illumination mounted in the light bulb housing and connected to the filament power supply circuit, each having a high-resistance wire that emits light accompanied by Joule heating. The filament phase dimming detection circuit and the filament power supply circuit control the filament lamps to achieve maximum illuminance in a low color temperature region when the LED elements for main illumination are not lit or are in a dimming region of low illuminance.

[0011] The above method yields the following effects. One or more LED elements for main illumination and one or more filament lamps for corrective illumination can be mounted in the same light bulb housing. The LED phase dimming detection circuit receives a phase-dimmed DC power source, detects an LED dimming signal, and the LED power supply circuit can supply the power source, controlled based on the LED dimming signal, to the LED elements for main illumination. The filament phase dimming detection circuit receives the power source, detects a filament dimming signal, and the filament power supply circuit can supply the power source, controlled based on the filament dimming signal, to the filament lamps for corrective illumination. The filament phase dimming detection circuit and the filament power supply circuit control the filament lamps to achieve maximum illuminance in the low color temperature region within a dimming region where the dimming degree of the power source is low and the illuminance of the LED elements is low, thereby reproducing the color temperature changes for each dimming degree of an incandescent light bulb. The low color temperature region is, for example, the range of deep red, light red, orange, yellow, pale yellow, etc., from 1800 to 4000 K (Kelvin). The maximum illuminance within the low color temperature region refers to the maximum illuminance of the filament lamp within the low color temperature region of the filament lamp.

[0012] The light bulb housing includes one or more LED elements for main illumination and one or more filament lamps for supplementary illumination. The light bulb housing may have, for example, a socket or electrode portion for a filament lamp that allows the filament lamp to be attached and replaced. The light bulb housing may have a base portion that can be attached to a light bulb socket. The light bulb housing may have terminals to which a dimmer power supply can be connected. The light bulb housing may have, for example, a transparent or translucent light-transmitting lamp cover portion that covers the LED elements and filament lamps.

[0013] The power source supplies dimmed power to the LED bulb. The power source is, for example, a source of DC power output from a dimming circuit. The power source can be a source of power output from an existing phase-controlled dimming circuit or an inverse-phase controlled dimming circuit that can control the dimming of a conventional incandescent bulb. The power source can convert AC power to DC power and supply dimmed and full-wave rectified power.

[0014] The LED phase dimming detection circuit detects the phase dimming waveform of the DC power source. The LED phase dimming detection circuit can detect the ON timing and OFF timing of the phase control or reverse phase control of the DC power source. The LED phase dimming detection circuit can control the ON / OFF timing according to at least one of the brightness or color temperature of one or more LED elements. The LED phase dimming detection circuit has a smoothing circuit, a peak value detection circuit, a phase dimming detection circuit, and a modulation signal generation circuit, enabling less noise and more stable illumination. The LED power supply circuit can apply a voltage based on the detected value of the LED phase dimming detection circuit to the LED elements. The smoothing circuit, peak value detection circuit, phase dimming detection circuit, modulation signal generation circuit, and LED power supply circuit of the LED phase dimming detection circuit can be replaced with electronic components equipped with an LED drive control circuit and a dimming control circuit having equivalent functions, or with a circuit board equipped with such electronic components.

[0015] The filament phase dimming detection circuit detects the phase dimming waveform of the DC power source. The filament phase dimming detection circuit can detect the ON timing and OFF timing of the phase control or reverse phase control of the DC power source. The filament phase dimming detection circuit can control the ON / OFF timing of one or more filament lamps according to at least one of their respective brightness or color temperature. The filament phase dimming detection circuit can be used as a voltage slicer to improve the reliability and stability of dimming control. The filament phase dimming detection circuit has a dimming limit detection circuit and a power control circuit, and can control the filament lamp to the maximum illuminance in the low color temperature region within a dimming region where the dimming degree of the power source is low and the illuminance of the LED element is low, thereby making it closer to the color temperature change of an incandescent bulb. The filament power supply circuit can apply a voltage based on the detected value of the filament phase dimming detection circuit to the filament lamp. The filament phase dimming detection circuit can be replaced with a voltage slicer. A filament power supply circuit to which the voltage slicer is connected can be connected a filament phase dimming detection circuit, a dimming limit detection circuit, and a power control circuit. The filament phase dimming detection circuit and the filament power supply circuit can be replaced with electronic components equipped with a voltage converter circuit, filament drive control circuit, filament ON control circuit, voltage detection circuit, and filament OFF control circuit having equivalent functions, or with a circuit board equipped with such electronic components.

[0016] The aforementioned LED element is a primary light source and can generate sufficient light intensity to serve as the main light source of the LED bulb of the present invention. One or more of the aforementioned LED elements can be provided, reducing power consumption compared to incandescent bulbs and enabling more economical lighting.

[0017] The filament lamp for corrective illumination assists the illumination of the main illumination LED element in order to reproduce the low color temperature of an incandescent bulb within the dimming range of the LED element with a low degree of dimming. One or more filament lamps may be provided, each having different light intensity and color temperature characteristics. The filament lamp has a high-resistance wire (filament) that emits light accompanied by Joule heating. The filament may be made of tungsten. The filament lamp may be, for example, a small axial-type light bulb. The filament lamp may have a base or terminals that can be attached to and removed from the socket of the light bulb housing.

[0018] The LED light bulb of the present invention has a light bulb housing that incorporates a plurality of filament lamps, each having at least one of the same luminous intensity or color temperature, and the filament phase dimming detection circuit and filament power supply circuit can control the dimming of the plurality of filament lamps according to the characteristics of each filament lamp.

[0019] The LED bulb equipped with multiple filament lamps with different characteristics can more precisely correct the light intensity or color temperature of the LED element for main illumination. The filament phase dimming detection circuit and filament power supply circuit can control the dimming of the multiple filament lamps according to the characteristics of each filament lamp. Furthermore, individual filament phase dimming detection circuits and filament power supply circuits can be provided for each of the multiple filament lamps. The multiple filament lamps with different characteristics can, for example, have different illuminances at the rated voltage, different color temperatures such as incandescent, neutral white, and daylight, or different maximum illuminances within the low color temperature range.

[0020] The LED bulb of the present invention has a filament phase dimming detection circuit and a filament power supply circuit, each having a dimming limit detection unit and a power supply circuit control unit, and the filament phase dimming detection circuit, filament power supply circuit, dimming limit detection unit and power supply circuit control unit can supply power to the filament lamp along the filament dimming curve, aiming for the ideal dimming curve of dimming degree and illuminance of an incandescent bulb, and creating a composite dimming curve that compensates for the difference between the LED dimming curve and the ideal dimming curve at the weak dimming degree.

[0021] The dimming limit detection unit can control the power supplied to the filament lamp to be maximized at a preset dimming level. In the dimming level region of the LED dimming curve where the dimming level deviates significantly from the ideal dimming curve of the incandescent bulb at the weak dimming level, the unit has a function to detect dimming limits so that the filament lamp is turned on from an off state, gradually emits light up to the maximum illuminance within the low color temperature region, and when it reaches a threshold or dimming value set between the weak dimming level and the rated dimming level, it can either maintain the maximum illuminance within the low color temperature region of the filament lamp or control the illuminance to gradually decrease. The dimming limit detection unit can output a detection signal when the dimming level threshold exceeds 0% and when it reaches 30%. The dimming limit detection unit can output a detection signal each time the dimming level reaches a dimming value between 0% and 100%, for example, every 0.5%, every 1%, every 2%, every 5%, every 10%, etc.

[0022] The power circuit control unit controls the light emission of the filament lamp according to the detection signal of the dimming limit detection unit. In a dimming level region that deviates significantly from the ideal dimming curve of the incandescent bulb at the weak dimming level of the LED dimming curve, the power circuit control unit lights the filament lamp from the off state, gradually emits light up to the maximum illuminance within the low color temperature region, and when reaching a threshold value or dimming value set between the weak dimming level and the rated dimming level, can maintain the filament lamp at the maximum illuminance within the low color temperature region or control the illuminance to gradually decrease. For example, in a dimming level region that deviates significantly from the ideal dimming curve of the incandescent bulb at the weak dimming level of the LED dimming curve, when the dimming level exceeds 0%, the power circuit control unit lights the filament lamp and controls the filament lamp to gradually increase the illuminance to the maximum within the low color temperature region as the dimming level increases until it reaches 30%. When the dimming level exceeds 30%, it can be controlled to either maintain the maximum illuminance within the low color temperature region or gradually decrease the illuminance and turn off the lamp.

[0023] Furthermore, the present invention provides a control method for the LED bulb, wherein the filament phase dimming detection circuit, the filament power circuit, the dimming limit detection unit, and the power circuit control unit control the power supply amount to gradually increase when the dimming level is from 0 to 10%, and then maintain the maximum illuminance within the low color temperature region in the range of the dimming level from 25 to 100%, or set the maximum illuminance within the low color temperature region when the dimming level is from 25 to 35%, gradually decrease the power supply amount in the range of the dimming level from 35 to 70%, and control to either turn off the lamp in the range of the dimming level from 50 to 80%.

[0024] The control method gradually increases the illuminance of the filament lamp within the low color temperature region in the dimming degree range of 0-10%, which is a dimming degree region in which the dimming degree of the LED dimming curve deviates significantly from the ideal dimming curve of the incandescent bulb at the low dimming degree. The control method can either maintain the maximum illuminance within the color temperature region in the dimming degree range of 25-100%, or set the maximum illuminance within the color temperature region at the dimming degree range of 25-35%, gradually decrease the power supply in the dimming degree range of 35-70%, and then turn off the light in the dimming degree range of 50-80%. This makes it possible to approximate the ideal dimming curve of the incandescent bulb by combining the LED dimming curve of the LED element, especially at the low dimming degree, and the filament dimming curve of the filament lamp. The control method approximates the combined dimming curve from the start of lighting the LED bulb to the maximum illuminance to the ideal dimming curve, thereby obtaining a color temperature change closer to that of an incandescent bulb. Further energy savings can be achieved by turning off the bulb within the dimming range of 50-80%.

[0025] Furthermore, the present invention provides a control method for an LED light bulb, wherein the filament phase dimming detection circuit, filament power supply circuit, dimming limit detection unit, and power supply circuit control unit are controlled to either maintain the maximum illuminance within the color temperature range at a dimming degree of 100-25%, or to start lighting at a dimming degree of 80-50% and gradually increase the power supply amount at a dimming degree of 70-35%, and then set the maximum illuminance within the color temperature range at a dimming degree of 35-25%, gradually decrease the power supply amount to a dimming degree of 10-0%, and turn off the light.

[0026] The control method maintains the maximum illuminance within the color temperature range in the range of 100% to 25% of the dimming level, or starts lighting in the range of 80% to 50% of the dimming level. The control method gradually increases the power supply amount in the range of 70% to 35% of the dimming level. The control method sets the maximum illuminance within the color temperature range at 35% to 25% of the dimming level, and gradually decreases the power supply amount until 10% to 0% of the dimming level and then turns off the light. Thereby, the combined dimming curve of the LED element that changes the dimming level from lighting to turning off, particularly the dimming curve of the LED with a very weak dimming level, and the filament dimming curve of the filament lamp can be approximated to the ideal dimming curve of the incandescent bulb. The control method approximates the combined dimming curve from the maximum illuminance of the LED bulb to turning off to the ideal dimming curve, and a color temperature change closer to that of an incandescent bulb can be obtained. Starting lighting in the range of 80% to 50% of the dimming level can further save energy.

Effect of the Invention

[0027] According to the LED bulb and its control method of the present invention, when receiving dimming by an existing phase control dimming facility, a color temperature closer to that of an incandescent bulb can be reproduced. When the LED element receiving control of a very weak dimming level is not lit due to a low voltage, the filament lamp is lit, and the color temperature change peculiar to the filament lamp can be reproduced. When receiving dimming by an existing phase control dimming facility, each of the LED element and the filament lamp can be controlled to reproduce a color temperature closer to that of an incandescent bulb. It can achieve an excellent effect of mounting a plurality of filament lamps with different characteristics and individually performing dimming control according to the characteristics of each filament lamp.

Brief Description of the Drawings

[0028] [Figure 1] Perspective view showing a partially disassembled LED bulb of the present embodiment [Figure 2] Perspective view showing a disassembled LED bulb of the present embodiment [Figure 3]These are plan views showing the arrangement of filament lamps in a light bulb housing: (a) a plan view showing a light bulb housing with two filament lamps, and (b) a plan view showing a light bulb housing with three filament lamps. [Figure 4] (a) Block diagram of the LED bulb in this embodiment, (b) Graph of illuminance-dimming degree of the LED bulb [Figure 5] (a) Block diagram and (b) Illuminance-Dimming degree graph of other LED bulbs in this embodiment [Figure 6] (a) Block diagram of another LED light bulb, (b) Block diagram of another LED light bulb of this embodiment [Figure 7] (a) Block diagram of another LED light bulb, (b) Circuit diagram of another LED light bulb of this embodiment [Figure 8] This graph shows the relationship between illuminance and dimming degree, with (a) a graph showing the ideal dimming curve for an incandescent light bulb and (b) a graph showing the dimming curve for a conventional LED element. [Modes for carrying out the invention]

[0029] Hereinafter, with reference to the drawings, an LED bulb 1 according to this embodiment, in which an LED element 2 for main illumination and a filament lamp 3 for corrective illumination are mounted in the same bulb housing 10, will be specifically described. In particular, as shown in Figures 1 to 4(a) and (b), this embodiment includes a bulb housing 10, an LED phase dimming detection circuit 21 mounted in the bulb housing 10 that receives a phase-dimmed DC power source 4 and detects an LED dimming signal, an LED power supply circuit 22 for main illumination mounted in the bulb housing 10 that controls the power source 4 based on the LED dimming signal, a filament phase dimming detection circuit 31 mounted in the bulb housing 10 that receives the power source 4 and detects a filament dimming signal, and a filament lamp for corrective illumination mounted in the bulb housing 10 that controls the power source 4 based on the filament dimming signal The LED bulb 1 comprises a filament power supply circuit 32, one or more main illumination LED elements 2 mounted on the light bulb housing 10 and connected to the LED power supply circuit 22, and one or more corrective illumination filament lamps 3 mounted on the light bulb housing 10 and connected to the filament power supply circuit 32, each having a high-resistance wire that emits light accompanied by Joule heating. The filament phase dimming detection circuit 31 and the filament power supply circuit 32 control the filament lamps 3 to achieve maximum illuminance in the low color temperature region when the main illumination LED elements 2 are not lit or are in a dimming region of low illuminance.

[0030] As shown in Figures 1 and 3(a), the light bulb housing 10 is equipped with a main lighting LED module 20 at its tip, which has either one or multiple LED elements 2 mounted on a substrate. Furthermore, the tip of the light bulb housing 10 can be equipped with a pair (2 in total) of axial-type small bulbs, which face each other across the LED module 20 at a 180° opening angle 320, for supplementary lighting. The mounting locations of the filament lamps 3 at the tip of the light bulb housing 10 can each be equipped with a socket for the electrodes of the filament lamps 3, allowing the filament lamps 3 to be individually attached, detached, and replaced using the sockets for the filament lamps 3.

[0031] If the filament lamp 3 for corrective lighting is an axial-type small bulb, it does not generate enough heat to adversely affect the LED module 20 for main lighting, so it can be mounted in close proximity to the LED module 20. Furthermore, if there is a risk that the filament lamp 3 for corrective lighting may adversely affect the LED module 20 for main lighting, it can be mounted at a sufficient distance 330 from the LED module 20 for main lighting, for example, a distance 330 that is 2 to 3 times the width dimension of the filament lamp 3 in the adjacent direction to the LED module 20. Additionally, a partition made of insulating material can be provided between the filament lamp 3 and the LED module 20 to prevent radiant heat and convection.

[0032] As shown in Figures 1 to 3(a), the light bulb housing 10 can be a heat sink 10 made of aluminum or other high thermal conductivity material. The tip of the light bulb housing 10 is fitted with a globe seat 11 made of ABS resin, which is resistant to heat and impact.

[0033] The outer circumference of the LED module 20 within the globe base 11 can be fitted with a glass composite (CEM-3) annular substrate 30 on which two filament lamps 3 are mounted, separated by a 180° opening angle 320 between them. The annular substrate 30 can have a ring shape in plan view with through holes to avoid the LED module 20 (LED element 2), or a C-shape or crescent shape in plan view with a recessed portion. The annular substrate 30 has a plug portion that can be attached to a socket portion provided on the bulb housing 10 side or the globe base 11 side, and can be electrically and mechanically detachably connected. The filament lamps 3 can be detached and replaced along with the annular substrate 30, making the replacement of the small filament lamps 3, which are replaced more frequently than the LED module 20, more efficient.

[0034] A polycarbonate globe 12 having a diffusion material is attached to the outer edge of the globe seat 11 to protect the LED module 20 and the filament lamp 3.

[0035] A mounting hole is provided at the rear end of the light bulb housing 10, and a control board 13 is housed in the mounting hole. A base 14 of, for example, an E26 type is provided at the end of the light bulb housing 10.

[0036] The filament lamps 3 for corrective illumination can be mounted one by one (a total of multiple lamps) on the same virtual circle with a predetermined diameter 340 (radius) centered on the LED module 20 for main illumination, separated from each other by equal opening angles 320. The predetermined diameter 340 is larger than the outer diameter of the LED module 20 and fits within the range of the bulb housing 10 (globe base 11).

[0037] Furthermore, as shown in Figure 3(b), the filament lamps 3 for corrective illumination mounted at the tip of the light bulb housing 10 can be arranged around the main illumination LED module 20 with a 120° opening angle 320 between them, and one axial-type small light bulb (a total of 3) can be mounted at a distance 330 from the LED module 20. Alternatively, one filament lamp 3 can be mounted at a distance 330 from the LED module 20, facing each other with a 90° opening angle 320, and one at a distance 330 from the LED module 20 (a total of 4). Similarly, five or more filament lamps 3 for corrective illumination can be mounted. The filament lamps 3 for corrective illumination have characteristics, for example, as shown in Table 1.

[0038] [Table 1]

[0039] As shown in Figures 1 to 4(a), the LED bulb 1 of this embodiment can supply a power source 4, which is obtained by adding phase dimming by an external dimmer to an AC commercial power supply supplied from an external source via a socket to which the base 14 is connected, and converting it to DC. The bulb housing 10 incorporates the LED phase dimming detection circuit 21 and the LED power supply circuit 22 for main illumination, which are mounted on the control board 13, as well as the filament phase dimming detection circuit 31 and the filament power supply circuit 32.

[0040] The LED phase dimming detection circuit 21 detects the dimming signal for the incandescent bulb from the power source 4 and outputs an LED dimming signal based on the dimming signal for the incandescent bulb. The LED phase dimming detection circuit 21 can detect the dimming signal for the incandescent bulb from the power source 4 and convert the dimming signal for the incandescent bulb into an LED dimming signal for output. The LED power supply circuit 22 for main lighting controls the output of the power source 4 based on the LED dimming signal and controls the brightness of the LED module 20 to follow the operation of the external dimming device.

[0041] The filament phase dimming detection circuit 31 detects the dimming signal for the incandescent bulb from the power source 4 and outputs a filament dimming signal based on the dimming signal for the incandescent bulb. The filament phase dimming detection circuit 31 can detect the dimming signal for the incandescent bulb from the power source 4 and convert the dimming signal for the incandescent bulb into a filament dimming signal for output. The filament dimming signal can control the filament lamp 3 to achieve maximum illuminance within the low color temperature range. The filament power supply circuit 32 for corrective illumination controls the output of the power source 4 based on the filament dimming signal and controls the brightness of the filament lamp 3.

[0042] The filament phase dimming detection circuit 31 and the filament power supply circuit 32 control the illuminance of the filament lamp 3 to be maximized within the low color temperature range when the LED module 20 for main illumination is not lit or is in a dimming range of low illuminance.

[0043] As shown in Figures 1 to 4(a), the LED bulb 1, as shown in the ideal dimming curve 5 in Figure 4(b), exhibits an illuminance of approximately 0.25 Lm at a dimming level of 60% for the main lighting LED module 20. In addition to the ideal dimming curve 5, Figure 4(b) also shows the dimming curve 6 for the filament lamp 3, the LED dimming curve 7, and the combined dimming curve 8.

[0044] The filament lamp 3 can have a maximum illuminance of approximately 0.037 Lm within the low color temperature range. The control method for the LED bulb 1 in this embodiment allows the filament phase dimming detection circuit 31 and the filament power supply circuit 32 to control the power supply to gradually increase from a dimming degree of 0-10% of the incandescent bulb, and then control the filament lamp 3 to maintain the maximum illuminance within the low color temperature range within a dimming degree of 25-100% of the incandescent bulb.

[0045] More specifically, the control method for the LED bulb 1 of this embodiment can be described as follows: The filament phase dimming detection circuit 31 and the filament power supply circuit 32 control the filament lamp 3 so that the amount of power supplied to the incandescent bulb gradually increases from 0% dimming degree, then the filament lamp 3 is controlled so that the maximum illuminance in the low color temperature region is reached at a dimming degree of 30% of the incandescent bulb, and the maximum illuminance in the low color temperature region is maintained in the dimming degree range of 30-100% of the incandescent bulb. As shown in the illuminance-dimming degree curve in Figure 4(b), the combined dimming curve 8 obtained by combining the dimming curve 7 of the LED element 2 or LED module 20 with the dimming curve 6 of the filament lamp 3 draws a curve that approximates the ideal dimming curve 5 of a conventional incandescent bulb (also shown in Figure 8(a)), and in particular, it can reproduce the low color temperature changes of an incandescent bulb in the dimming region of no illumination or low illuminance (for example, dimming degree 0-30%).

[0046] The control method for the LED bulb 1 in this embodiment can be used not only to control from the start of illumination to the maximum brightness as described above, but also to control from the maximum brightness to the off side, and can be controlled in the reverse procedure of increasing brightness from illumination as described above. The filament phase dimming detection circuit 31 and the filament power supply circuit 32 can maintain the maximum illuminance within the low color temperature region in the range of 100-25% dimming of the incandescent bulb, and then gradually reduce the power supply to the dimming of the incandescent bulb to 10-0%, and then turn off. More specifically, the filament phase dimming detection circuit 31 and the filament power supply circuit 32 can maintain the maximum illuminance within the low color temperature region in the range of 100-30% dimming of the incandescent bulb, and then gradually reduce the power supply to the dimming of the incandescent bulb to 30-0%, and then turn off. This control allows the low color temperature of the filament lamp 3 to be added to the high color temperature of the LED element 2, which emits light at the rated voltage, resulting in warm lighting across the entire range of dimming.

[0047] As shown in Figure 5(a), the LED bulb 1 of this embodiment can be provided with a dimming control detection circuit 33 and a power control circuit 34 in addition to the filament phase dimming detection circuit 31 and the filament power supply circuit 32.

[0048] The dimming control detection circuit 33 detects, for example, every 1% of the dimming degree for the incandescent light bulb based on the dimming signal for the incandescent light bulb from the power source 4, and the power control circuit 34 outputs a filament dimming signal to control the brightness of the filament lamp 3 every 1% of the dimming degree for the incandescent light bulb.

[0049] The LED bulb 1 equipped with the dimming control detection circuit 33 and the power supply control circuit 34 exhibits behavior as shown in, for example, the ideal dimming curve 5, the dimming curve 6 for the filament lamp 3, the LED dimming curve 7, and the combined dimming curve 8 in Figure 5(b).

[0050] As shown in Figure 5(b), the dimming control detection circuit 33 and the power control circuit 34 can output the filament dimming signal so that the illuminance of the filament lamp 3 in the low color temperature region gradually reaches 0 to 100% while the dimming degree of the dimming signal for the incandescent light bulb reaches 0 to 30%, and further output the filament dimming signal so that the brightness gradually decreases in the range of 30 to 100% of the dimming degree of the dimming signal for the incandescent light bulb, and the lamp turns off while the dimming degree of the dimming signal for the incandescent light bulb reaches 80 to 100%.

[0051] As shown in Figure 5(b), the combined dimming curve 8, obtained by combining the dimming curve 7 of the LED module 20 with the dimming curve 6 of the filament lamp 3, exhibits a curve that approximates the ideal dimming curve 5 of a conventional incandescent light bulb. In particular, it can reproduce the color temperature changes of an incandescent light bulb not only within the dimming range of no illumination or low illumination, but also in a range of 0 to 60% (0 to 100%) of the dimming degree for an incandescent light bulb.

[0052] The control method for the LED bulb 1 in this embodiment can be used not only to control from the start of illumination to the maximum brightness as described above, but also to control from the maximum brightness to the off side, and can be controlled in the reverse procedure of increasing brightness from illumination as described above. The filament phase dimming detection circuit 31, dimming limit detection circuit 33, power control circuit 34 and filament power supply circuit 32 can control the bulb to start illumination in the range of 80-50% of the dimming degree for incandescent bulbs, gradually increase the power supply in the range of 70-35% of the dimming degree for incandescent bulbs, set the illuminance to the maximum within the low color temperature region at 35-25% of the dimming degree for incandescent bulbs, and gradually decrease the power supply to 10-0% of the dimming degree for incandescent bulbs, and then turn off. More specifically, the filament phase dimming detection circuit 31, dimming limit detection circuit 33, power supply control circuit 34, and filament power supply circuit 32 can control the lighting to start at a dimming level of 65% for the incandescent bulb, gradually increase the power supply within the range of a dimming level of 65-30% for the incandescent bulb, set the maximum illuminance within the low color temperature region at a dimming level of 30% for the incandescent bulb, and gradually decrease the power supply to a dimming level of 30-0% for the incandescent bulb, thereby turning off the light.

[0053] As shown in Figure 6(a), the LED phase dimming detection circuit 21 may include a smoothing circuit 23, a peak value detection circuit 24, a phase dimming detection circuit 25, and a modulation signal generation circuit 26. The smoothing circuit 23 smooths the pulsating current contained in the rectified current to a state closer to DC, thereby supplying more stable power to the LED module 20. The peak value detection circuit 24 detects the height of the peak in the waveform of the dimming signal for the incandescent light bulb. The phase dimming detection circuit 25 detects the degree of dimming for the incandescent light bulb based on the peak value of the waveform detected by the peak value detection circuit 24.

[0054] The modulation signal generation circuit 26 controls the output of the LED power supply circuit 22 based on the detected dimming degree for the incandescent light bulb. The LED phase dimming detection circuit 21, which includes a smoothing circuit 23, a peak value detection circuit 24, a phase dimming detection circuit 25, and a modulation signal generation circuit 26, can stabilize the illumination of the LED module 20 and achieve smoother dimming. Alternatively, the filament phase dimming detection circuit 31 can be replaced with a voltage slicer circuit 35.

[0055] The voltage slicer circuit 35 controls the filament power supply circuit 32 more smoothly, stabilizing the power supply to the filament lamp 3 and preventing flickering associated with dimming. The power source 4 can be supplied with DC power via a full-wave rectifier circuit 40 provided inside or outside the LED bulb 1.

[0056] As shown in Figure 6(b), in addition to the voltage slicer circuit 35, the system includes a filament phase dimming detection circuit 31, a dimming limit detection circuit 33, and a power supply control circuit 34, enabling more stable dimming of the filament lamp 3.

[0057] As shown in Figure 7(a), the LED bulb 1 of this embodiment can use the LED drive circuit and dimming control circuit 27 instead of the LED phase dimming detection circuit 21 and LED power supply circuit 22 shown in Figure 4(a). Furthermore, the LED bulb 1 in Figure 7(a) can be made simpler in its component configuration by replacing the filament phase dimming detection circuit 31 and filament power supply circuit 32 shown in Figure 4(a) with a voltage converter circuit 310, a filament drive control circuit 311, a filament ON control circuit 312, a voltage detection circuit 313, and a filament OFF control circuit 314.

[0058] In this embodiment, the LED bulb 1 can be shown in a more specific circuit diagram, for example, as shown in Figure 7(b), and the filament phase dimming detection circuit 31 and the filament power supply circuit 32 can be configured to include a voltage converter circuit 310, a filament drive control circuit 311, a filament ON control circuit 312, a voltage detection circuit 313, a filament OFF control circuit 314, and a filament power supply circuit 32. [Industrial applicability]

[0059] The LED light bulb and its control method of the present invention can be used in lighting equipment and control technologies such as dimmable lighting, stage lighting, theater lighting, light shows, light-ups, illuminations, and electronic displays. [Explanation of Symbols]

[0060] 1 LED light bulb 10. Same light bulb housing 11. The Globe Theatre 12 Same glove 13. Control board 14. Nozzle 2. LED elements for main lighting 20 LED modules 21. LED Phase Dimming Detection Circuit 22. Same LED power supply circuit 23. Smoothing circuit 24. Peak Value Detection Circuit 25 Phase dimming detection circuit 26 Modulated signal generation circuit 27. LED driving circuit and dimming control circuit. 3. Filament lamp for corrective lighting 30 Same annular substrate 31. Filament Phase Dimming Detection Circuit 32. Filament power supply circuit 33. Dimming limit detection circuit 34. Same Power Control Circuit 35. Same voltage slicer circuit 310 Same voltage converter circuit 311 Same filament drive control circuit 312 Same Filament ON control circuit 313 Voltage detection circuit 314 Filament OFF control circuit 320 Same Filament lamp opening angle 330 Distance from LED element 2 340 The diameter of the virtual circle arranged by the filament lamp. 4 Power Sources 40 Same full wave rectifier circuit 5. Ideal dimming curve 6. Dimming curve of filament lamp 3 7. Dimming curve of LED element 2 8. Synthetic dimming curve

Claims

1. The light bulb housing and An LED phase dimming detection circuit is mounted in the aforementioned light bulb housing, receives a phase-dimmed DC power source, and outputs an LED dimming signal based on a dimming signal for an incandescent light bulb. A main lighting LED power supply circuit mounted in the light bulb housing controls the power source based on the LED dimming signal, A filament phase dimming detection circuit is mounted in the light bulb housing, receives the power source, and detects a filament dimming signal based on a dimming signal for an incandescent light bulb. A filament power supply circuit for corrective lighting, mounted in the light bulb housing and controlling the power source based on the filament dimming signal, One or more LED elements for main illumination are mounted in the aforementioned light bulb housing and connected to the aforementioned LED power supply circuit, One or more filament lamps for corrective illumination, mounted in the light bulb housing, connected to the filament power supply circuit, and having high-resistance wires that emit light accompanied by Joule heating, and It has, The filament phase dimming detection circuit and the filament power supply circuit control the filament lamp to achieve maximum illuminance within a low color temperature range when the LED element for main illumination is not lit or is in a dimming range of low illuminance.

2. The aforementioned light bulb housing is equipped with multiple filament lamps that differ from each other in at least one of their brightness or color temperature. The filament phase dimming detection circuit and the filament power supply circuit control at least one of the dimming or color adjustment of each of the multiple filament lamps. The LED light bulb according to claim 1.

3. The filament phase dimming detection circuit and the filament power supply circuit are, It has a dimming limit detection unit and a power supply circuit control unit, The filament phase dimming detection circuit, filament power supply circuit, dimming limit detection unit, and power supply circuit control unit supply power to the filament lamp along the filament dimming curve, aiming for the ideal dimming curve of the dimming degree and illuminance of an incandescent light bulb, and compensating for the difference between the LED dimming curve and the ideal dimming curve at the weak dimming degree, thereby creating a composite dimming curve. The LED light bulb according to claim 2.

4. The filament phase dimming detection circuit, filament power supply circuit, dimming limit detection unit, and power supply circuit control unit are, After controlling the power supply to gradually increase from a dimming level of 0-10% of the incandescent light bulb, A control method for an LED bulb according to claim 3, wherein the LED bulb is controlled to maintain the maximum illuminance in the low color temperature region at a dimming degree of 25 to 100% of the incandescent bulb, or to set the maximum illuminance in the low color temperature region at a dimming degree of 25 to 35% of the incandescent bulb, gradually reduce the power supply at a dimming degree of 35 to 70%, and turn off at a dimming degree of 50 to 80%.

5. The filament phase dimming detection circuit, filament power supply circuit, dimming limit detection unit, and power supply circuit control unit are, Maintaining maximum illuminance within the low color temperature range with a dimming degree of 100-25% for incandescent light bulbs, Alternatively, the incandescent light bulb may be turned on at a dimming level of 80-50%, and the power supply may be gradually increased at a dimming level of 70-35%. After controlling it to one of the two, The dimming degree of the incandescent light bulb is set to 35-25% to achieve the maximum illuminance within the low color temperature range. The power supply to the incandescent light bulb is gradually reduced to a dimming level of 10-0%, and then turned off. A method for controlling an LED light bulb according to claim 3.

Images