Lighting device

Abstract

A lighting device comprises a light source and a light source driver. The light source comprises at least two light-emitting element groups. The light source driver is used for outputting a first current to drive a first light-emitting element group in the at least two light-emitting element groups to emit light and outputting a second current to drive a second light-emitting element group in the at least two light-emitting element groups to emit light, the first current being a first periodic current, and the second current being a second periodic current. The second current is a direct current or a second periodic current different from the first periodic current.

Description

Technical Field

[0001] This case relates to a lighting device, and more particularly to a lighting device with health benefits. Background Technology

[0002] In lighting technology, stable, flicker-free light sources are highly sought after. In some situations, because LED lamps can reproduce the waveform of the input current very well, directly driving LED lamps with AC power or failing to suppress ripples in the input current can cause visually perceptible flicker. Although certain visual stimuli can elicit corresponding responses in the brain, prolonged exposure to environments with visible flicker can lead to visual fatigue or difficulty concentrating. Therefore, providing a lighting device that solves these problems is an important issue in this field. Utility Model Content

[0003] The purpose of this disclosure is to provide a lighting device to solve at least one of the above-mentioned problems.

[0004] One aspect of this disclosure provides a lighting device comprising a light source and a light source driver. The light source comprises at least two groups of light-emitting elements. The light source driver is configured to output a first current to drive the first group of light-emitting elements in the at least two groups of light-emitting elements to emit light, and to output a second current to drive the second group of light-emitting elements in the at least two groups of light-emitting elements to emit light, wherein the first current is a first periodic current, and wherein the second current is a DC current or a second periodic current different from the first periodic current.

[0005] According to one embodiment of this disclosure, the first periodic current has a frequency such that the first light-emitting element group blinks at that frequency.

[0006] According to one embodiment of this disclosure, the intensity of the first periodic current varies periodically, wherein the intensity of the direct current does not change with time, and wherein the direction of the first periodic current and the direct current does not change with time.

[0007] According to one embodiment of this disclosure, the intensity of the first periodic current and the second periodic current varies periodically, and the direction of the first periodic current and the second periodic current does not change with time.

[0008] According to one embodiment of this disclosure, the first periodic current has the same frequency as the second periodic current, and a waveform of the first periodic current is the same as that of the second periodic current, which is 180 degrees out of phase.

[0009] According to one embodiment of this disclosure, the waveform is one of a square wave, a triangular wave, and a sine wave.

[0010] According to one embodiment of this disclosure, the two frequencies of the first periodic current and the second periodic current are different.

[0011] According to one embodiment of this disclosure, if the second current is the direct current, the periodic wave of the first periodic current is one of a square wave, a triangular wave, a sine wave, an amplitude modulation wave, and a pulse width modulation wave.

[0012] Another aspect of this disclosure provides a lighting device comprising a light source and a light source driver. The light source driver is used to output a periodic current to drive at least one group of light-emitting elements to emit light, and the periodic wave of the periodic current is one of a square wave, a triangular wave, a sine wave, an amplitude-modulated wave, and a pulse width-modulated wave.

[0013] According to one embodiment of this disclosure, the intensity of the periodic current varies periodically, and the direction of the periodic current does not change with time.

[0014] In summary, one aspect of the lighting device disclosed herein uses a first group of light-emitting elements driven by different currents and a second light-emitting element to mix light, thereby incorporating the desired stroboscopic effect into the mixed light and simultaneously reducing visual discomfort caused by the desired flicker. Another aspect of the lighting device disclosed herein uses a group of light-emitting elements driven by a periodic current to reduce visual discomfort caused by the desired flicker. Attached Figure Description

[0015] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below:

[0016] Figure 1A This is a schematic diagram of a lighting device according to some embodiments of the present disclosure.

[0017] Figure 1B This is a schematic diagram of a light source driver according to some embodiments of the present disclosure.

[0018] Figure 2 This is a schematic diagram of a lighting device according to some embodiments of the present disclosure.

[0019] Figure 3 This is a schematic diagram of a light source according to some embodiments of the present disclosure.

[0020] Figure 4 This is a schematic diagram of the current provided by a channel according to some embodiments of the present disclosure.

[0021] Figure 5 This is a schematic diagram of the current provided by a channel according to some embodiments of the present disclosure.

[0022] Figure 6This is a schematic diagram of the current provided by a channel according to some embodiments of the present disclosure.

[0023] Figure 7 This is a schematic diagram of the current provided by a channel according to some embodiments of the present disclosure.

[0024] Figure 8 This is a schematic diagram of the current provided by a channel according to some embodiments of the present disclosure.

[0025] Figure 9 This is a schematic diagram of a periodic current provided by a channel according to some embodiments of the present disclosure.

[0026] Figure 10 This is a schematic diagram illustrating the scheduling control of a lighting device according to some embodiments of the present disclosure.

[0027] Figure 11 This is a schematic diagram illustrating the scheduling control of a lighting device according to some embodiments of the present disclosure.

[0028] The attached figures are labeled as follows:

[0029] 100:Lighting device

[0030] 110, 210: Light source driver

[0031] 120, 320: Light source

[0032] V AC AC voltage

[0033] CH1~CHn: Channels

[0034] G1~Gn: Light-emitting element group

[0035] CH1~CHn: Channels

[0036] L11~L14, L21~L24, L31~L34, Ln1~Ln4: Light-emitting elements

[0037] P1, P2, P3, P31, P32: Period

[0038] I CH1_DC ,I CH3_DC ,I CH4_DC DC current

[0039] I CH(n-1)_DC ,I CHn_DC DC current

[0040] I CH1_P ~I CHn_P Periodic current

[0041] I CH1_H ~I CHn_H ,I1_H ~I 8_H Maximum value

[0042] I CH1_L ~I CHn_L ,I 1_L ~I 8_L Minimum value

[0043] I1~I8: Periodic current

[0044] IA1~IA8: Average Value

[0045] fc: fundamental frequency Detailed Implementation

[0046] The following detailed description provides examples in conjunction with the accompanying drawings. However, the provided examples are not intended to limit the scope of this disclosure, and the description of the structural operation is not intended to limit the order of execution. Any structure resulting from the recombination of elements and producing an apparatus with equivalent functionality is within the scope of this disclosure. Furthermore, the illustrations are for illustrative purposes only and are not drawn to their original dimensions. For ease of understanding, the same or similar elements will be designated with the same symbols in the following description.

[0047] Unless otherwise specified, the terms used throughout this specification and claims generally have their ordinary meaning in the context of this art, the disclosure, and the specific content. Furthermore, the terms “comprising,” “including,” “having,” “containing,” etc., as used herein, are open-ended terms, meaning “including but not limited to.” Additionally, the term “and / or” as used herein includes any one or more of the related listed items and all combinations thereof.

[0048] Please see Figure 1A , Figure 1A This is a schematic diagram of a lighting device 100 according to some embodiments of the present disclosure. Figure 1A As shown, the lighting device 100 includes a light source driver 110 and a light source 120. In some embodiments, the light source driver 110 is used to receive an AC voltage V from an AC power source (e.g., mains power). AC And the AC voltage V ACThe voltage is converted to DC voltage, thereby driving the light-emitting element groups G1 to Gn on the light source 120 via channels CH1 to CHn respectively. In some embodiments, each of the light-emitting element groups G1 to Gn includes at least one light-emitting diode (LED), that is, the light-emitting element groups G1 to Gn are LED groups, and the light source 120 is an LED lamp panel. In other embodiments, each of the light-emitting element groups G1 to Gn includes at least one incandescent lamp, that is, the light-emitting element groups G1 to Gn are incandescent lamp groups, and the light source 120 is an incandescent lamp fixture. The light-emitting elements in the above light-emitting element groups are examples, and this disclosure is not limited thereto. For the sake of simplicity, subsequent embodiments will use an LED lamp panel as an example.

[0049] Please see Figure 1B . Figure 1B This is a schematic diagram of a light source driver 110 according to some embodiments of the present disclosure. Figure 1B As shown, the light source driver 110 includes an AC-to-DC converter circuit 112 and a voltage conversion circuit 116. In some embodiments, the light source driver 110 includes a two-stage circuit (i.e., the AC-to-DC converter circuit 112 and the voltage conversion circuit 116), which converts the AC voltage V through the AC-to-DC converter circuit 112. AC Converted to DC voltage V DC It can effectively suppress AC ripples, thereby providing a stable DC voltage V. DC This eliminates excess flicker.

[0050] In some embodiments, the AC-to-DC conversion circuit 112 includes at least one AC-to-DC converter for receiving DC voltage and converting AC voltage V AC Converted to DC voltage V DC .

[0051] In some embodiments, the voltage conversion circuit 116 includes voltage converters DC1 to DCn. The voltage converters DC1 to DCn are electrically coupled to the AC-to-DC conversion circuit 112 to convert the DC voltage V... DC It is converted into an output voltage, thereby providing drive current through channels CH1 to CH2 respectively.

[0052] In some embodiments, by modulating the signals at the reference pins of each voltage converter DC1 to DCn, the output voltages of voltage converters DC1 to DCn can be changed, thereby controlling the amplitude and waveform of the DC current or periodic current output by each voltage converter DC1 to DCn. The direction and amplitude of the DC current do not change with time, the amplitude of the periodic current changes periodically, and the direction of the periodic current does not change with time. In some embodiments, the waveform of the periodic current's periodic wave is one of a square wave, a triangle wave, and a sine wave. In some embodiments, the waveform of the periodic current's periodic wave is one of a square wave, a triangle wave, a sine wave, an amplitude-modulated wave, and a pulse-width modulated wave. In some embodiments, the waveform of the periodic current's periodic wave is a mixture of at least two of a square wave, a triangle wave, a sine wave, an amplitude-modulated wave, and a pulse-width modulated wave.

[0053] Please see Figure 2 . Figure 2 This is a schematic diagram of a lighting device according to some embodiments of the present disclosure. In some embodiments, Figure 2 The light source driver 210 corresponds to Figure 1A The light source driver 110. For example... Figure 2 As shown, the light source driver 210 has channels CH1 to CHn, and drives light-emitting element groups G1 to Gn through channels CH1 to CHn respectively. In some embodiments, the colors of the light emitted by the light-emitting element groups G1 to Gn can be different or the same. For example, light-emitting element groups G1, G2, G3, and Gn are used to emit white light, yellow light, red light, and green light, respectively. As another example, light-emitting element groups G1 to Gn are used to emit white light.

[0054] In some embodiments, the light source driver 210 drives the light-emitting element group G1 through channel CH1. The light-emitting element group G1 includes light-emitting elements L11 to L14, and the connection relationship between the light-emitting elements L11 to L14 can be series, parallel, or a combination of series and parallel.

[0055] In some embodiments, the light source driver 210 drives the light-emitting element group G2 through channel CH2. The light-emitting element group G2 includes light-emitting elements L21 to L24, and the connection relationship between the light-emitting elements L21 to L24 can be series, parallel, or a combination of series and parallel.

[0056] In some embodiments, the light source driver 210 drives the light-emitting element group G3 through channel CH3. Similarly, the light source driver 210 drives the light-emitting element group Gn through channel CHn. The connection relationships of light-emitting elements L31 to L34 in the light-emitting element group G3 and the connection relationships of light-emitting elements Ln1 to Ln4 in the light-emitting element group Gn are similar to the connection relationships between light-emitting elements L11 to L14, and will not be described again here. In the above embodiments, each of the light-emitting element groups G1 to Gn contains 4 light-emitting elements. In other embodiments, each of the light-emitting element groups G1 to Gn may contain more or fewer light-emitting elements, and this disclosure is not limited thereto.

[0057] Please see Figure 3 . Figure 3 This is a schematic diagram of a light source 320 according to some embodiments of the present disclosure. In some embodiments, Figure 3 The light source 320 corresponds to Figure 1A The light source 120 is described above. In some embodiments, the light source 320 may be a light-emitting diode (LED) lamp board. In some embodiments, the light source 320 includes light-emitting element groups G1 to Gn, and the light-emitting element groups G1 to Gn are arranged sequentially on the substrate of the LED lamp board, wherein the substrate may be a printed circuit board.

[0058] At Figure 3 In one embodiment, the light-emitting elements (e.g., light-emitting elements L11 to L14) of each of the light-emitting element groups G1 to Gn are adjacent to each other. In other embodiments, the light-emitting elements of the light-emitting element groups G1 to Gn may be arranged in an alternating pattern. Therefore, the arrangement of the light-emitting element groups G1 to Gm on the substrate may be based on a checkerboard pattern, a diamond pattern, or a honeycomb pattern arranged in an alternating pattern on the substrate, and this disclosure is not limited thereto.

[0059] Please see Figure 1A and Figure 4 , Figure 4 This is a schematic diagram illustrating the current supplied to channels CH1 to CHn according to some embodiments of this disclosure. Figure 4 In this embodiment, channels CH2, CH4, and CHn are used to provide a periodic current I whose direction does not change over time but whose amplitude changes periodically. CH2_P I CH4_P and I CHn_P Furthermore, channels CH1, CH3, and CH(n-1) are used to provide a direct current I whose direction and amplitude do not change with time (e.g., during the period P1 to P3). CH1_DC I CH3_DC and I CH(n-1)_DC .

[0060] In some embodiments, the periodic current I CH2_P I CH4_P and ICHn_P The maximum value I CH2_H I CH4_H and I CHn_H The output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0061] In some embodiments, the periodic current I CH2_P I CH4_P and I CHn_P minimum value I CH2_L I CH4_L and I CHn_L Each less than the maximum value I CH2_H I CH4_H and I CHn_H Furthermore, the output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0062] In some embodiments, the periodic current I CH2_P I CH4_P and I CHn_P The frequency is configured based on the frequency of human brain waves (e.g., α waves, β waves, γ waves, θ waves, or other brain wave categories), and this frequency is perceptible to human vision, and the frequency can be a frequency in the γ wave band (e.g., 40Hz, 60Hz, or other suitable frequencies). Thus, the periodic current I... CH2_P I CH4_P and I CHn_P The light-emitting element groups G2, G4, and Gn are driven respectively to emit light that flashes at the stated frequency. In this way, visual (light) stimulation corresponding to the gamma wave frequency band will trigger a corresponding response in the brain, thereby achieving a brain health effect.

[0063] In some embodiments, the DC current I CH1_DC I CH3_DC and I CH(n-1)_DC The amplitude can be adjusted within the range of 0% to 100% of the output of the light source driver 110. Thus, the DC current I... CH1_DC I CH3_DC and I CH(n-1)_DC The light-emitting element groups G1, G3 and G(n-1) are driven respectively to emit flicker-free light, thereby compensating for the dark state of the light-emitting element groups G2, G4 and Gn that emit flickering light, thus reducing visual discomfort and alleviating visual fatigue.

[0064] Please see Figure 1A and Figure 5 , Figure 5 This is a schematic diagram illustrating the current supplied to channels CH1 to CHn according to some embodiments of this disclosure. Figure 5In the embodiments, channels CH2, CH3, CH(n-1), and CHn are used to provide a periodic current I whose direction does not change with time but whose amplitude changes periodically. CH2_P I CH3_P I CH(n-1)_P and I CHn_P Furthermore, channels CH1 and CH4 are used to provide a direct current I whose direction and amplitude do not change with time (e.g., during the period P1 to P3). CH1_DC I CH3_DC and I CH(n-1)_DC .

[0065] In some embodiments, the maximum value I of the periodic currents CH2, CH3, CH(n-1) and CHn is... CH2_H I CH3_H I CH(n-1)_H and I CHn_H The output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0066] In some embodiments, the minimum value I of the periodic currents CH2, CH3, CH(n-1), and CHn is... CH2_L I CH3_L I CH(n-1)_L and I CHn_L The output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0067] like Figure 5 As shown, the periodic current I provided by channel CH2 CH2_P The frequency and the periodic current I provided by channel CH3 CH3_P The frequencies are different. Specifically, the periodic current I... CH2_P and periodic current I CH3_P The frequencies can be set based on different brain health needs; they can each correspond to different frequencies within the human brainwave frequency band. For example, the periodic current I... CH2_P The frequency can be 60Hz (i.e., the length of each of P1 to P3 is 1 / 60 second), and the periodic current I CH3_P The frequency can be 40Hz (i.e., the length of each of P31 and P32 is 1 / 40 of a second), thereby causing the light-emitting element groups G2 and G3 to emit light that flashes at different frequencies, corresponding to brainwave frequencies. The driving method of light-emitting element groups G(n-1) and Gn is similar to that of light-emitting element groups G2 and G3, and will not be described in detail here. In this way, visual (light) stimulation corresponding to brainwave frequencies will trigger corresponding responses in the brain, thereby achieving brain health benefits.

[0068] In some embodiments, the DC current I CH1_DC and I CH4_DCThe amplitude can be adjusted within the range of 0% to 100% of the output of the light source driver 110. Thus, the DC current I... CH1_DC and I CH4_DC The light-emitting element groups G1 and G4 are driven respectively to emit flicker-free light, thereby compensating for the dark state of the light-emitting element groups G2, G4, G(n-1) and Gn that emit flickering light, thus reducing visual discomfort and alleviating visual fatigue.

[0069] exist Figure 4 and Figure 5 In one embodiment, the waveform of the periodic wave of the periodic current is a square wave. In other embodiments, the periodic wave of the periodic current can be a square wave, a triangular wave, a sine wave, or a mixture of the above. Therefore, this disclosure is not limited thereto.

[0070] Please see Figure 1A and Figure 6 , Figure 6 This is a schematic diagram illustrating the current supplied to channels CH1 to CHn according to some embodiments of this disclosure. Figure 6 In this embodiment, channels CH2, CH4, and CHn are used to provide a periodic current I whose direction does not change over time but whose amplitude changes periodically. CH2_P I CH4_P and I CHn_P Furthermore, channels CH1, CH3, and CH(n-1) are used to provide a periodic current I whose direction does not change with time but whose amplitude changes periodically. CH1_P I CH3_P and I CH(n-1)_P .

[0071] In some embodiments, the periodic current I CH1_P ~I CHn_P The maximum value I CH1_H ~I CHn_H The output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0072] In some embodiments, the periodic current I CH1_P ~I CHn_P minimum value I CH1_L ~I CHn_L Each less than the maximum value I CH1_H ~I CHn_H Furthermore, the output of the light source driver 110 can be adjusted within the range of 0% to 100%.

[0073] In some embodiments, the periodic current I CH1_P ~I CHn_PThe frequency is configured based on the frequency of human brain waves (e.g., α waves, β waves, γ waves, θ waves, or other brain wave categories), and this frequency is perceptible to human vision, and the frequency can be a frequency in the γ wave band (e.g., 40Hz, 60Hz, or other suitable frequencies). Thus, the periodic current I... CH1_P ~I CHn_P Light-emitting element groups G1 to Gn are driven respectively, causing them to emit light that flashes at the specified frequency. In this way, visual (light) stimulation corresponding to the gamma wave frequency band triggers a corresponding response in the brain, thereby achieving a brain health effect.

[0074] In some embodiments, the periodic current I CH2_P With periodic current I CH1_P The frequencies are the same, and the periodic current I CH2_P The waveform and the periodic current I with 180 degrees out of phase CH1_P The waveforms are the same.

[0075] In some embodiments, the periodic current I CH2_P and I CH1_P With periodic current I CH4_P and I CH3_P The frequencies are different. In some embodiments, the periodic current I... CH2_P and I CH1_P The frequency is 60Hz (i.e., the length of each of P1 to P3 is 1 / 60 second), and the periodic current I CH4_P and I CH3_P The frequency is 40Hz (i.e., the length of each of P31 and P32 is 1 / 40 of a second).

[0076] In some embodiments, the periodic current I CH4_P With periodic current I CH3_P The frequencies are the same, and the periodic current I CH4_P The waveform and the periodic current I with 180 degrees out of phase CH3_P The waveforms are the same.

[0077] Thus, the periodic current I CH1_P ~I CHn_P It can drive the light-emitting element group G1 to Gn to emit light with the desired flicker, while simultaneously transmitting a periodic current I with complementary waveforms. CH1_P ~I CHn_P The flickering light emitted by the light source has a relatively low flicker fusion threshold as the modulation process is increased, thereby reducing visual discomfort, alleviating visual fatigue, and providing brain health benefits.

[0078] exist Figure 6In one embodiment, the waveform of the periodic wave of the periodic current is a square wave. In other embodiments, the periodic wave of the periodic current can be a square wave, a triangular wave, a sine wave, or a mixture of the above. Therefore, this disclosure is not limited thereto.

[0079] Please see Figure 7 . Figure 7 This is a schematic diagram illustrating the current supplied to channels CH1 to CHn according to some embodiments of this disclosure. Compared to Figure 6 Implementation examples, Figure 7 The periodic current I CH1_P ~I CHn_P The periodic wave is a triangular wave. Figure 7 The periodic current I CH1_P ~I CHn_P Other properties and the way in which the light-emitting elements G1 to Gn are driven are similar to those of the other properties of the light-emitting elements G1 to Gn. Figure 6 Periodic current I in CH1_P ~I CHn_P Other properties and the way they drive the light-emitting elements G1 to Gn are similar, and will not be described in detail here.

[0080] Please see Figure 8 . Figure 8 This is a schematic diagram illustrating the current supplied to channels CH1 to CHn according to some embodiments of this disclosure. Compared to Figure 6 Implementation examples, Figure 8 The periodic current I CH1_P ~I CHn_P The periodic wave is a sine wave. Figure 8 The periodic current I CH1_P ~I CHn_P Other properties and the way in which the light-emitting elements G1 to Gn are driven are similar to those of the other properties of the light-emitting elements G1 to Gn. Figure 6 Periodic current I in CH1_P ~I CHn_P Other properties and the way they drive the light-emitting elements G1 to Gn are similar, and will not be described in detail here.

[0081] Please see Figure 1A and Figure 9 , Figure 9 This is a schematic diagram illustrating the periodic currents I1 to I8 provided by channels according to some embodiments of the present disclosure. In some embodiments, the periodic currents output by channels CH1 to CHn of the light source driver 210 may be... Figure 9 The combination of at least one of the periodic currents I1 to I8 and a direct current whose amplitude does not change with time.

[0082] like Figure 9As shown, the periodic waves of the periodic currents I1 to I6 are square waves, triangular waves, sine waves, and amplitude-modulated waves, respectively. In some embodiments, the periodic waves of the periodic currents I7 to I8 are pulse width modulated waves. In some embodiments, the directions of the periodic currents I1 to I8 do not change with time, and the amplitudes of the periodic currents I1 to I8 change periodically.

[0083] In some embodiments, the average values ​​of the periodic currents I1 to I8, IA1 to IA8, can be adjusted within the range of 0% to 100% of the output of the light source driver 110.

[0084] In some embodiments, the maximum value of the periodic currents I1 to I8 is I 1_H ~I 8_H They are respectively greater than the average values ​​IA1 to IA8, and can be adjusted within the range of 0% to 100% of the output of the light source driver 110.

[0085] In some embodiments, the minimum value I of the periodic currents I1 to I8 is... 1_L ~I 8_L They are respectively less than the average values ​​IA1 to IA8, and can be adjusted within the range of 0% to 100% of the output of the light source driver 110.

[0086] In some embodiments, the periodic currents I4 to I6 each have a pulsating waveform (e.g., square wave, triangle wave, or sine wave) oscillating at a fundamental frequency fc during the pulse duration, and the amplitude of each of the periodic currents I4 to I6 does not change over time during the pulse pause. In some embodiments, the fundamental frequency fc can be a high frequency imperceptible to human vision, for example, 1 kHz to 100 MHz.

[0087] In some embodiments, the waveform of each of the periodic currents I7-I8 is a pulse width modulated wave. In some embodiments, the amplitude of each of the periodic currents I7-I8 varies periodically (e.g., each period P1 and P2 corresponds to one period), and the direction of each of the periodic currents I7-I8 does not change with time. In some embodiments, the frequency of each of the periodic currents I7-I8 (i.e., the reciprocal of one period (e.g., the length of period P1)) is perceptible to human vision, and the frequency can be a frequency in the gamma wave band (e.g., 40Hz, 60Hz, or other suitable frequencies). In some embodiments, the frequency of the series of rectangular waves of each of the periodic currents I7-I8 is a high frequency imperceptible to human vision. In some embodiments, the waveform of each of the periodic currents I7-I8 is a sinusoidal pulse width modulated wave.

[0088] In some embodiments, the pulse width of a series of rectangular waves of the periodic current I7 varies with the amplitude of the sine wave, and the amplitude of the series of rectangular waves of the periodic current I7 is equal in the first and second halves of the sine modulation cycle (e.g., the first and second halves of period P1).

[0089] In some embodiments, the pulse widths of a series of rectangular waves of the periodic current I8 vary according to the amplitude of a sine wave, and the amplitudes of the rectangular waves of the periodic current I8 in the first half-cycle of the sinusoidal modulation (e.g., the first half of period P1) differ from the amplitudes of the rectangular waves of the periodic current I8 in the first half-cycle of the sinusoidal modulation (e.g., the second half of period P1). In some embodiments, the amplitudes of the rectangular waves are equal to each other in the first half-cycle of the sinusoidal modulation (e.g., the first half of period P1). In some embodiments, the amplitudes of the rectangular waves are equal to each other in the second half-cycle of the sinusoidal modulation (e.g., the second half of period P1).

[0090] Please see Figure 1A and Figure 10 . Figure 10 This is a schematic diagram illustrating the scheduling control of a lighting device 100 according to some embodiments of the present disclosure. In some embodiments, mode ① is defined as a general mode, mode ② is defined as a health care mode, and mode ③ is defined as a treatment mode.

[0091] At Figure 10 In some embodiments, the lighting device 100 is scheduled in cycles of length X, and each cycle includes a combination of one of modes ② (health care mode) and mode ③ (treatment mode) with mode ① (general mode). In some embodiments, the duration Y of one of modes ② (health care mode) and mode ③ (treatment mode) is specified.

[0092] Please see Figure 1A and Figure 11 . Figure 11 This is a schematic diagram of the scheduling control of a lighting device 100 according to some embodiments of the present disclosure.

[0093] At Figure 11 In this embodiment, the lighting device 100 can be scheduled according to the user's lifestyle. For example, lighting in one of modes ② (health care mode) and mode ③ (treatment mode) may be provided from 6:00 to 7:00 AM and from 8:00 to 10:00 PM. And lighting in mode ① (general mode) may be provided from 10:00 PM to 12:00 AM.

[0094] In summary, the lighting device 100 of this disclosure can suppress unnecessary flicker caused by ripple through two-stage voltage conversion, and the lighting device 100 provides flicker-free and mixed light with desired flicker by driving the light source 120 to improve visual discomfort caused by desired flicker, thereby avoiding decreased vision or inability to concentrate.

[0095] Although this disclosure has been described above with reference to embodiments, it is not intended to limit this disclosure. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the appended claims.

Claims

1. A lighting device, characterized in that, Include: A light source comprising at least two groups of light-emitting elements; and A light source driver is configured to output a first current to drive a first light-emitting element group in the at least two light-emitting element groups to emit light, and to output a second current to drive a second light-emitting element group in the at least two light-emitting element groups to emit light, wherein the first current is a first periodic current, and wherein the second current is a DC current or a second periodic current different from the first periodic current.

2. The lighting device as claimed in claim 1, characterized in that, The first periodic current has a frequency so that the first light-emitting element group blinks at that frequency.

3. The lighting device as described in claim 1, characterized in that, The intensity of the first periodic current changes periodically, while the intensity of the direct current does not change with time, and the direction of the first periodic current and the direct current does not change with time.

4. The lighting device as claimed in claim 1, characterized in that, The intensity of the first periodic current and the second periodic current varies periodically, and the direction of the first periodic current and the second periodic current does not change with time.

5. The lighting device as described in claim 4, characterized in that, The first periodic current has the same frequency as the second periodic current, and a waveform of the first periodic current is the same as that of the second periodic current, which is 180 degrees out of phase.

6. The lighting device as described in claim 5, characterized in that, The waveform is one of a square wave, a triangular wave, or a sine wave.

7. The lighting device as claimed in claim 4, characterized in that, The first periodic current has two different frequencies from the second periodic current.

8. The lighting device as claimed in claim 1, characterized in that, If the second current is the DC current, then the periodic wave of the first periodic current is one of the following: a square wave, a triangular wave, a sine wave, an amplitude modulation wave, or a pulse width modulation wave.

9. A lighting device, characterized in that, Include: A light source, comprising at least one group of light-emitting elements; and A light source driver is used to output a periodic current to drive the at least one light-emitting element group to emit light, and the periodic current is one of a square wave, a triangular wave, a sine wave, an amplitude modulation wave, and a pulse width modulation wave.

10. The lighting device as claimed in claim 9, characterized in that, The intensity of the periodic current changes periodically, and the direction of the periodic current does not change with time.

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