Light-emitting diode driver and lighting device

Abstract

To provide a light emitting diode driver.SOLUTION: A light emitting diode driver includes: a modulator for modulating a carrier signal based on a periodic signal and generating a first modulated signal; a current control circuit electrically connected to a light emitting diode load and the modulator and generating at least one control signal based on a reference voltage signal, a feedback voltage signal from the light emitting diode load, and the first modulated signal; and a DC current converter electrically connected to the current control circuit and the light emitting diode load and generating pulsating DC current based on the at least one control signal, and providing the pulsating DC current to the light emitting diode load.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present application relates to a light-emitting diode driver, and more particularly to a light-emitting diode driver and a lighting device suitable for driving a light-emitting diode to emit a light beam having a hidden scintillation component.

Background Art

[0002] Currently, lighting is closely related to human life. Good lighting can improve the quality of human life. For example, in an environment with a perceptible scintillation light source, human vision is prone to fatigue and increases the pressure on the visual system. As a result, working, studying, or living in an environment with scintillation light rays for a long time may cause effects such as dizziness, increased eye pressure, and / or decreased vision. Therefore, how to provide a lighting device that solves the above problems is an important issue in the art.

Summary of the Invention

Means for Solving the Problems

[0003] The present disclosure provides a light-emitting diode driver including a modulator for modulating a carrier signal based on a periodic signal to generate a first modulation signal, a current control circuit electrically connected to a light-emitting diode load and the modulator, and configured to generate at least one control signal based on a reference voltage signal, a feedback voltage signal from the light-emitting diode load, and the first modulation signal, and a DC converter electrically connected to the current control circuit and the light-emitting diode load, and configured to generate a pulsating direct current based on the at least one control signal and provide it to the light-emitting diode load.

[0004] In some embodiments, the pulsating direct current oscillates at a fundamental frequency within a pulse duration, and a pulse repetition frequency of the pulsating direct current is lower than the fundamental frequency.

[0005] In some embodiments, the fundamental frequency of the pulsating direct current corresponds to the carrier frequency of the carrier signal, and the pulse repetition frequency of the pulsating direct current corresponds to the frequency of the periodic signal.

[0006] In some embodiments, the pulse repetition frequency is lower than 100 Hz.

[0007] In some embodiments, the pulse repetition frequency is a constant value within the range of 1 Hz to 100 Hz.

[0008] In some embodiments, the modulator modulates the amplitude of the carrier signal based on the periodic signal to generate the first modulation signal, and the periodic signal is a square wave signal.

[0009] In some embodiments, the periodic signal is a sine wave signal, the modulator performs sine wave pulse width modulation based on the periodic signal and the carrier signal to generate the first modulation signal, and the waveform of the pulsating direct current generated by the DC converter is a sine wave pulse width modulation wave.

[0010] In some embodiments, the current control circuit is electrically connected to the modulator and the light-emitting diode load, and includes an error unit for subtracting the feedback voltage signal and the first modulation signal to obtain an error signal, an error amplifier electrically connected to the error unit for generating a compensation voltage signal based on the error signal and the reference voltage signal, a modulation circuit electrically connected to the error amplifier for generating a second modulation signal based on the compensation voltage signal, and a gate driver electrically connected to the modulation circuit for controlling the DC converter to generate the pulsating direct current by generating at least one control signal based on the second modulation signal.

[0011] In some embodiments, the current control circuit is electrically connected to the modulator and the reference voltage source, and includes a superimposing unit for superimposing the first modulation signal and the reference voltage signal from the reference voltage source to generate a desired signal, an error amplifier electrically connected to the superimposing unit for generating a compensation voltage signal based on the desired signal and the feedback voltage signal, a modulation circuit electrically connected to the error amplifier for generating a second modulation signal based on the compensation voltage signal, and a gate driver electrically connected to the modulation circuit for controlling the DC converter to generate the at least one control signal based on the second modulation signal so as to generate the pulsating DC current.

[0012] The present disclosure provides a lighting device including a lamp board including a plurality of light-emitting diodes, and a light-emitting diode driver electrically connected to the lamp board for driving the light-emitting diodes by generating and outputting a pulsating DC current, wherein the pulsating DC current oscillates at a fundamental frequency within a pulse duration, and a pulse repetition frequency of the pulsating DC current is lower than the fundamental frequency.

Advantages of the Invention

[0013] As described above, the light-emitting diode driver of the present disclosure controls the waveform of the pulsating DC current based on the modulation signal, thereby hiding the scintillation component in the light emitted by the light-emitting diodes, and further achieving a specific need (for example, treating, preventing or improving a specific disease or symptom) by the hidden scintillation stimulus, and improving the perception of the human visual system to scintillation.

Brief Description of the Drawings

[0014] For a clearer and more understandable description of the above and other objects, features, advantages and embodiments of the present disclosure, the description of the accompanying drawings is as follows.

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Embodiments for Carrying Out the Invention

[0015] Examples will be given below and described in detail with reference to the accompanying drawings. However, the provided examples are not for limiting the scope included in the present disclosure, and the description of the structure and operation is not for limiting the execution order. Any structure in which elements are recombined, any device generated and having equivalent effects are all within the scope included in the present disclosure. Note that the drawings are for illustrative purposes only and are not drawn according to the original dimensions. For ease of understanding, the same or similar elements in the following description will be denoted by the same reference numerals. The terms used throughout the specification and the scope of the patent application have the general meaning in which each term is used in this field and the general meaning in the content disclosed here and the special content, unless otherwise specified. Also, the terms used in this specification, such as "comprising", "including", "having", "containing", etc., are all open terms, that is, they mean "including but not limited to". Also, "and / or" used in this specification includes any one or more of the items listed in relation and all combinations thereof.

[0016] Please refer to FIG. 1. FIG. 1 is a schematic diagram of a lighting device 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the lighting device 100 includes a light-emitting diode driver 110 and a lamp board 120. In some embodiments, the lamp board 120 includes a circuit board 122 and one or more light-emitting diodes LED. In some embodiments, the lamp board 120 may be used as a lamp body of a lamp fixture (e.g., a bubble lamp, a table lamp, a floor lamp, a recessed lamp, a flat lamp, or other lamp fixtures). In some embodiments, the light-emitting diode LED is mounted on the circuit board 122, and the light-emitting diode driver 110 is electrically connected to the circuit board 122 to supply power to the light-emitting diode LED via the circuit board 122. In some embodiments, the light-emitting diode driver 110 is used to drive the light-emitting diode LED to emit light rays having hidden scintillation components. In some embodiments, the radiation output of the light-emitting diode LED periodically changes at a constant luminance, and the frequency of the radiation output is set according to specific requirements so that the lighting device 100 can be used as ambient lighting or task lighting suitable for improving specific symptoms (e.g., treating, preventing, or improving specific diseases or symptoms by light stimulation of a specific frequency).

[0017] Please refer to FIG. 2. FIG. 2 is a schematic diagram of a lighting device 100 according to an embodiment of the present disclosure. As shown in FIG. 2, the lighting device 100 includes a light-emitting diode driver 110 and a light-emitting diode load 130. In some embodiments, the light-emitting diode load 130 in FIG. 2 corresponds to one or more light-emitting diodes LED in FIG. 1. In some embodiments, the light-emitting diode driver 110 has a light-emitting diode positive output terminal and a light-emitting diode negative output terminal, and the plurality of light-emitting diodes LED are serially connected and / or parallely connected between the light-emitting diode positive output terminal and the light-emitting diode negative output terminal of the light-emitting diode driver 110. In some embodiments, the light-emitting diode driver 110 is used to receive and convert the alternating current of the alternating current power supply AC to generate a pulsating direct current I OUT and provide it to the light-emitting diode load 130.

[0018] Please refer to FIG. 3. FIG. 3 is a schematic diagram of the functional blocks of the lighting device 100 according to an embodiment of the present disclosure. As shown in FIG. 3, the light-emitting diode driver 110 includes an AC-DC converter 111, a DC converter 112, a modulator 113, a current control circuit 114, a feedback circuit 115, a periodic signal generation circuit 116, and a carrier signal generation circuit 117.

[0019] In some embodiments, the AC-DC converter 111 is used to receive AC electricity from an AC power source AC and convert the AC electricity into DC electricity. In some embodiments, the input side of the DC converter 112 is electrically connected to the output side of the AC-DC converter 111, thereby receiving the DC electricity output by the AC-DC converter 111 and converting it into a pulsating DC current I OUT to drive the light-emitting diode load 130.

[0020] In some embodiments, the feedback circuit 115 is a current sensing resistor, a current converter, or other similar circuits / equivalent circuits. In some embodiments, the feedback circuit 115 is electrically connected to the light-emitting diode load 130 to detect the pulsating DC current I OUT flowing through the light-emitting diode load 130 and convert the pulsating DC current I OUT into a feedback voltage signal V FB .

[0021] In some embodiments, the periodic signal generation circuit 116 is used to generate a periodic signal S per . In some embodiments, the frequency of the periodic signal S per is set according to the demand of a specific optical scintillation stimulus. In some embodiments, the frequency of the periodic signal S per may be set to a value lower than 100 Hz according to human brain waves (e.g., alpha waves (e.g., 8 Hz to 14 Hz), beta waves (e.g., 12.5 Hz to 28 Hz), gamma waves (e.g., 25 Hz to 100 Hz), etc.), thereby synchronizing the optical scintillation stimulus with the activity rhythm of human brain cells, further enhancing human concentration, stabilizing emotions, reducing stress, and enhancing consciousness.

[0022] In some embodiments, the carrier signal generation circuit 117 is used to generate the carrier signal S cair . In some embodiments, the waveform of the carrier signal S cair may be a square wave, a triangular wave, or a sine wave, but the present application is not limited thereto. In some embodiments, the carrier frequency of the carrier signal S cair is higher than the frequency of the periodic signal S per .

[0023] In some embodiments, the modulator 113 is electrically connected to the periodic signal generation circuit 116 and the carrier signal generation circuit 117, and modulates the carrier signal S per based on the periodic signal S cair to generate a modulation signal S mod . In some embodiments, the modulator 113 is a pulse amplitude modulator and performs pulse amplitude modulation on the carrier signal S per based on the periodic signal S cair . In some embodiments, the modulator 113 is a pulse width modulator and performs pulse width modulation on the carrier signal S per based on the periodic signal S cair . In some embodiments, the modulator 113 is a sine wave pulse width modulator and performs sine wave pulse width modulation on the carrier signal S per based on the periodic signal S cair .

[0024] In some embodiments, the current control circuit 114 is electrically connected to the modulator 113 and controls the waveform of the pulsating DC current I mod output by the DC converter 112 based on the modulation signal S OUT . In some embodiments, the modulation signal S mod is the target waveform of the pulsating DC current I OUT . In some embodiments, the current control circuit 114 generates a control signal CS for controlling one or more switches included in the DC converter 112 based on the modulation signal S mod , the reference voltage signal V ref and the feedback voltage signal V FB to control the pulsating DC current IOUT The DC converter 112 is controlled to generate OUT and is further used to drive the light emitting diode load 130. In some embodiments, the number of control signals CS depends on the number of switches included in the DC converter 112, and the present application is not limited thereto.

[0025] Please refer to FIG. 4. FIG. 4 is a schematic diagram of the circuit architecture of the lighting device 100 according to an embodiment of the present disclosure. As shown in FIG. 4, the current control circuit 114 includes an error unit EU, an error amplifier EA, a modulation circuit MDC, and a gate driver GD.

[0026] In some embodiments, the error unit EU is electrically connected to the feedback circuit 115 and the modulator 113. In some embodiments, the error unit EU subtracts the feedback voltage signal V FB and the modulation signal S mod to generate an error signal S err .

[0027] In some embodiments, the first input terminal of the error amplifier EA is used to receive the reference voltage signal Vref, and the second input terminal of the error amplifier EA is electrically connected to the error unit EU. In some embodiments, the error amplifier EA generates a compensation voltage signal V comp based on the reference voltage signal Vref and the error unit EU.

[0028] In some embodiments, the modulation circuit MDC is a pulse width modulation circuit. In some embodiments, the modulation circuit MDC is electrically connected to the error amplifier EA and generates a modulation signal MS based on the compensation voltage signal V comp . In some embodiments, the modulation circuit MDC is a pulse width modulation circuit and the modulation signal MS is a pulse width modulation signal. In some embodiments, the modulation circuit MDC is a pulse frequency modulation circuit and the modulation signal MS is a pulse frequency modulation signal. Therefore, the present application is not limited thereto.

[0029] In some embodiments, the gate driver GD is electrically connected to the modulation circuit MDC and generates a control signal CS for controlling the switching of the DC converter 112 based on the modulation signal MS. In some embodiments, the control signal CS is a pulse width modulation signal. In some embodiments, the control signal CS is a pulse frequency modulation signal. However, the present application is not limited thereto.

[0030] In the embodiment of FIG. 4, the feedback circuit 115 takes the current sensing resistor Rsen as an example, but the present application is not limited thereto.

[0031] How the current control circuit 114 generates the pulsating DC current I mod based on the modulation signal S OUT To better understand, please refer to FIGS. 4, 5A-5B, 6A-6B, and 7A-7B. FIGS. 5A-5B, 6A-6B, and 7A-7B show the periodic signal S per , carrier signals S cair1 ~S cair3 , modulation signals S mod1 ~S mod3 , and pulsating DC currents I out1 ~I out3 in some embodiments of the present disclosure. In some embodiments, the carrier signals S cair1 ~S cair3 , modulation signals S mod1 ~S mod3 and pulsating DC currents I out1 ~I out3 respectively correspond to the carrier signal S cair , modulation signal S mod and pulsating DC current I out in FIG. 4.

[0032] As shown in FIGS. 5A and 5B, the carrier signal S cair1 is a square wave signal, and its carrier frequency f c is higher than the frequency f per of the periodic signal S m . In some embodiments, the carrier frequency f c is a value within the range of 20k to 80 kHz. In some embodiments, the periodic signal S perThe frequency f m is a value lower than 100 Hz. In some embodiments, the periodic signal S per The frequency f m is a value within the range of 1 Hz to 100 Hz. In some embodiments, the periodic signal S per The frequency f m may be set to a value lower than 100 Hz (or a value within the range of 1 Hz to 100 Hz) according to human brain waves (for example, alpha waves (for example, 8 Hz to 14 Hz), beta waves (for example, 12.5 Hz to 28 Hz), gamma waves (for example, 25 Hz to 100 Hz), etc.), thereby synchronizing the optical scintillation stimulation with the activity rhythm of human brain cells, and further enhancing human concentration, stabilizing emotions, reducing stress, and / or enhancing consciousness. In some embodiments, in order to enhance human concentration, the periodic signal S per The frequency f m may be set in the range of 25 Hz to 100 Hz based on gamma waves. In some embodiments, the periodic signal S per The frequency f m may be set based on a stimulation frequency for a specific disease, for example, 40 Hz, thereby improving neurodegenerative diseases (for example, Alzheimer's disease).

[0033] In some embodiments, the modulator 113 performs amplitude modulation on the carrier signal S per based on the periodic signal S cair1 to generate a modulation signal S mod1 . In some embodiments, the current control circuit 114 generates a control signal CS based on the modulation signal S mod1 to control the DC converter 112 to generate a pulsed DC current I out1 . In some embodiments, the pulsed DC current I out1 includes periodic repetitive pulses, and each pulse repetition period PRP includes a pulse duration PDP and a pulse pause period PAP. In some embodiments, the pulsating DC current I out1 oscillates at a fundamental frequency f f within the pulse duration PDP, and the pulsating DC current Iout1 The pulse repetition frequency PRF of out1 is lower than the fundamental frequency f. f In some embodiments, the pulsed direct current I out1 is a pulsating waveform (e.g., a square waveform) that oscillates at the fundamental frequency f within the pulse duration PDP, and the pulsed direct current I f is a pure direct current within the pulse pause period PAP, and the pure direct current is relative to the change amplitude of the pulsating waveform during the pulse duration PDP of the pulsed direct current I. out1 In some embodiments, the pulsed direct current I out1 has a fundamental frequency f that corresponds to the carrier frequency f, and the pulse repetition frequency PRF of the pulsed direct current I out1 corresponds to the frequency f of the periodic signal S. f In some embodiments, the average value of the pulsed direct current I c is greater than 0, and the minimum value of the pulsed direct current I out1 is 0 or greater. In some embodiments, the average value and the minimum value of the pulsed direct current I per are greater than 0. In some embodiments, the oscillation amplitude during the pulse duration PDP of the pulsed direct current I m is less than 0.1 times the average value of the pulsed direct current I. out1 Thus, the output frequency of the light emitting diode LED driven by the light emitting diode driver 110 can satisfy a specific demand stimulation frequency, and controls the emission output of the light emitting diode LED to periodically change at a constant luminance, thereby hiding a scintillation stimulation having a specific frequency in the emission output of the light emitting diode LED. out1 Thereby, the emission output of the lamp panel 120 has a constant luminance, can be used as general illumination, and the scintillation component hidden at a specific frequency in its emission output can enhance human concentration, stabilize emotions, reduce stress, and / or enhance consciousness, and thus improve / prevent specific related diseases. out1 As shown in FIGS. 6A and 6B, the carrier signal S out1 out1 cair2

[0034] As shown in FIGS. 6A and 6B, the carrier signal S cair2is a triangular wave signal, and its carrier frequency f c is the frequency f per of the periodic signal S m and is higher than that. In some embodiments, the modulator 113 performs amplitude modulation on the carrier signal S per based on the periodic signal S cair2 to generate the modulation signal S mod2 In some embodiments, the current control circuit 114 generates the control signal CS based on the modulation signal S mod2 to control the DC converter 112 to generate the pulsed DC current I out2 In some embodiments, the pulsed DC current I out2 is a pulsating waveform (e.g., triangular waveform) oscillating at the fundamental frequency f f within the pulse duration PDP, and the pulsed DC current I out2 is a pure DC current during the pulse pause period PAP, and the pure DC current is relative to the change amplitude of the pulsating waveform during the pulse duration PDP of the pulsed DC current I out2 .

[0035] As shown in FIGS. 7A and 7B, the carrier signal S cair3 is a sine wave signal, and its carrier frequency f c is the frequency f per of the periodic signal S m and is higher than that. In some embodiments, the modulator 113 performs amplitude modulation on the carrier signal S per based on the periodic signal S cair3 to generate the modulation signal S mod3 In some embodiments, the current control circuit 114 generates the control signal CS based on the modulation signal S mod3 to control the DC converter 112 to generate the pulsed DC current I out3 In some embodiments, the pulsed DC current I out3 is a pulsating waveform (e.g., sine wave waveform) oscillating at the fundamental frequency f f within the pulse duration PDP, and the pulsed DC current I out3 is a pure DC current during the pulse pause period PAP, and the pure DC current is the pulsed DC current Iout3 It is related to the change amplitude of the pulsation waveform during the pulse duration PDP.

[0036] In some embodiments, the pulsed direct current I out2 and I out3 The pulse repetition frequency PRF and the fundamental frequency f f and the carrier frequency f c and the periodic signal S per The corresponding relationship with the frequency f m and the frequency setting are the same as those of the pulsed direct current I out1 The pulse repetition frequency PRF and the fundamental frequency f f and the carrier frequency f c and the periodic signal S per The corresponding relationship with the frequency f m and the frequency setting, and will not be described herein anymore. In some embodiments, the pulsed direct current I out2 and I out3 The settings of the average value, maximum value and minimum value are the same as those of the pulsed direct current I out1 The settings of the average value, maximum value and minimum value, and will not be described herein anymore.

[0037] Please refer to FIGS. 4, 8A - 8B and 9A - 9B. FIGS. 8A - 8B and 9A - 9B show the periodic signal S per' , carrier signal S cair4 , modulation signal S mod4 , pulsating direct current I out4 in some embodiments of the present disclosure. per' , carrier signal S cair4 ~S cair5 , modulation signal S mod4 ~S mod5 and pulsating direct current I out4 ~I out5 correspond to the periodic signal S per , carrier signal S cair , modulation signal S mod and pulsating direct current I out in FIG. 4 respectively.

[0038] As shown in FIGS. 8A and 8B, the carrier signal Scair4 is a triangular wave signal, which is a periodic signal S per' is a sine wave signal, and its carrier frequency f c is higher than the frequency f per' of the periodic signal S m In some embodiments, the carrier signal S cair4 has the same amplitude change range in the first half cycle and the second half cycle. In some embodiments, the modulator 113 performs pulse width modulation on the carrier signal S per' based on the periodic signal S cair4 to generate a modulation signal S mod4 That is, the modulation signal S mod4 is a sine wave pulse width modulation signal. In some embodiments, the current control circuit 114 generates a control signal CS based on the modulation signal S mod4 to control the DC converter 112 to generate a pulsed DC current I out4 In some embodiments, the waveform of the pulsed DC current I out4 is a sine wave pulse width modulation wave, and its output frequency f o is the same as the frequency f per' of the periodic signal S m In some embodiments, the frequency f per' of the periodic signal S m has been described in the above embodiments and will not be described further here.

[0039] As shown in FIGS. 9A and 9B, the carrier signal S cair5 is a triangular wave signal, which is a periodic signal S per' is a sine wave signal, and its carrier frequency f c is higher than the frequency f per' of the periodic signal S m In some embodiments, the carrier signal S cair5 has different amplitude change ranges in the first half cycle and the second half cycle. In some embodiments, the modulator 113 performs pulse width modulation on the carrier signal S per' based on the periodic signal S cair5 to generate a modulation signal S mod5 That is, the modulation signal S mod5is a sine wave pulse width modulation signal. In some embodiments, the current control circuit 114 generates a control signal CS based on the modulation signal S mod4 to control the DC converter 112 to generate a pulsed DC current I out5 . In some embodiments, the waveform of the pulsed DC current I out5 is a sine wave pulse width modulation wave, and its output frequency f o corresponds to the frequency f per of the periodic signal S m . In some embodiments, the frequency f per of the periodic signal S m has been described in the above embodiments and will not be described further here.

[0040] In some embodiments, the pulse repetition frequency PRF and the fundamental frequency f out4 of the pulsed DC currents I out5 and the carrier frequency f f and the correspondence and frequency setting with the frequency f c of the periodic signal S per are the same as the correspondence and frequency setting of the pulse repetition frequency PRF and the fundamental frequency f m of the pulsed DC current I out1 and the carrier frequency f f and the frequency f c of the periodic signal S per and will not be described further here. In some embodiments, the setting of the average value, maximum value, and minimum value of the pulsed DC currents I m is the same as the setting of the average value, maximum value, and minimum value of the pulsed DC current I out4 and I out5 and will not be described further here. out1 and will not be described further here.

[0041] Please refer to FIG. 10. FIG. 10 is a schematic diagram of the circuit architecture of the lighting device 200 according to an embodiment of the present disclosure. As shown in FIG. 10, the lighting device 200 includes an AC-to-DC converter 111, a DC converter 112, a modulator 113, a current control circuit 114, a feedback circuit 115, a periodic signal generation circuit 116, and a carrier signal generation circuit 117. In some embodiments, the current control circuit 114 includes a superimposing unit SU, an error amplifier EA, a modulation circuit MDC, and a gate driver GD. The lighting device 200 in FIG. 10 is different from the embodiment in FIG. 3 in that the periodic signal S per is superimposed on the reference voltage signal V ref . In some embodiments, the superimposing unit SU is electrically connected to the modulator 113 and the reference voltage source. In some embodiments, the superimposing unit SU is used to generate a desired signal S mod by superimposing the modulation signal S ref on the reference voltage signal V exp . In some embodiments, the first input terminal of the error amplifier EA is electrically connected to the superimposing unit SU, and the second input terminal of the error amplifier EA is electrically connected to the feedback circuit 115. In some embodiments, the error amplifier EA is used to generate a compensation voltage signal V exp based on the desired signal S FB and the feedback voltage signal V comp . In some embodiments, the modulation circuit MDC controls the DC converter 112 to generate a pulsating DC current I comp by providing a modulation signal MS to the gate driver GD based on the compensation voltage signal V out . In some embodiments, the pulsating DC current I out output by the DC converter 112 in FIG. 10 corresponds to one of the pulsating DC currents I out1 ~I out5 in FIGS. 5B to 9B.

[0042] Please refer to FIGS. 11 to 13. FIGS. 11 to 13 show the periodic signals S pera ~S perc and the pulsating DC currents I outa ~I outcIt is a schematic diagram of the waveform. In some embodiments, by providing a selection switch (for example, a 3-pin switch) between the output terminal of the periodic signal generation circuit 116 and the output terminal of the modulator 113 and the current control circuit 114 in FIG. 3 or FIG. 10, the current path between the output terminal of the periodic signal generation circuit 116 and the current control circuit 114 or the current path between the output terminal of the modulator 113 and the current control circuit 114 can be conducted to switch the output mode (for example, treatment mode, health care mode or normal mode) of the lighting device 100 or 200.

[0043] In some embodiments, in the treatment mode, by selecting to conduct the current path between the output terminal of the periodic signal generation circuit 116 and the superimposing unit SU in the current control circuit 114 by a selection switch (not shown), the superimposing unit SU superimposes one of the periodic signals S pera ~S perc on the reference voltage signal V ref to generate a desired signal S exp and further, based on the difference between the desired signal S exp and the feedback voltage signal V FB control the DC converter 112 to generate one of the corresponding pulsating DC currents I outa ~I outc to provide lighting that scintillates at a specific frequency, as shown in FIGS. 11 to 13.

[0044] In some embodiments, in the health care mode, by selecting to conduct the current path between the output terminal of the modulator 113 and the superimposing unit SU in the current control circuit 114 by a selection switch (not shown), the superimposing unit SU superimposes one of the modulation signals S mod1 ~S mod5 on the reference voltage signal V ref to generate a desired signal S exp and further, based on the difference between the desired signal S exp and the feedback voltage signal V FB control the DC converter 112 to generate one of the pulsating DC currents I out1 ~I out5Control the DC converter 112 to generate one of the corresponding ones, thereby hiding the component that scintillates at a specific frequency in general lighting, as shown in FIGS. 5A to 9B.

[0045] In some embodiments, in the normal mode, a selection switch (not shown) disconnects the current path between the output terminal of the periodic signal generation circuit 116 and the output terminal of the modulator 113 and the current control circuit 114, and controls the DC converter 112 to output a pure DC current to the light-emitting diode load 130, thereby providing lighting without a strobe.

[0046] Please refer to FIGS. 14 and 15. FIGS. 14 to 15 are schematic diagrams of the schedule control of the lighting devices 100 or 200 according to some embodiments of the present disclosure. In some embodiments, mode 1 is defined as the normal mode, mode 2 is the health care mode, and mode 3 is the treatment mode.

[0047] In the embodiment of FIG. 14, the schedule of the lighting devices 100 and 200 has the length of X as one cycle, and each cycle includes a combination of one of mode 2 (health care mode) and mode 3 (treatment mode) and mode 1 (normal mode). In some embodiments, one of mode 2 (health care mode) and mode 3 (treatment mode) lasts for a time length of Y.

[0048] In the embodiment of FIG. 15, the schedule of the lighting devices 100 and 200 can be set according to the user's life. For example, provide lighting of one of mode 2 (health care mode) and mode 3 (treatment mode) from 6:00 to 7:00 am and from 8:00 to 10:00 pm. Also, provide lighting of mode 1 (normal mode) from 10:00 to 12:00 pm.

[0049] Please refer to FIG. 16. FIG. 16 is a schematic diagram of a lighting device 300 according to an embodiment of the present disclosure. In some embodiments, the lighting device 300 includes an AC-to-DC converter 111, a DC converter 112, a light-emitting diode load 130, a feedback circuit 115, and a microcontroller MCU. In some embodiments, the microcontroller MCU includes one or more analog-to-digital converters ADC, a microprocessor MPU, a memory MEM, and a gate driver GD. In some embodiments, the microcontroller MCU is used to receive a reference voltage signal V ref and a feedback voltage signal V FB . The one or more analog-to-digital converters ADC convert the reference voltage signal V ref and the feedback voltage signal V FB into digital signals and transmit them to the microprocessor MPU. In some embodiments, a modulation waveform and its modulation frequency f m are stored in the memory MEM. In some embodiments, a carrier waveform and its carrier frequency f cair are further stored in the memory MEM. In some embodiments, the microprocessor MPU is electrically connected to the memory MEM, and extracts the modulation waveform and its modulation frequency f m and the carrier waveform and its carrier frequency f cair from the memory, thereby modulating the carrier waveform using the modulation waveform to calculate and obtain a modulation signal. In some embodiments, the microprocessor MPU controls the DC converter 112 to generate a pulsating direct current I ref corresponding to the waveform of the modulation signal based on the data of the modulation signal, the reference voltage signal V FB and the feedback voltage signal V out . In some embodiments, the pulsating direct current I out generated by the DC converter 112 in FIG. 16 corresponds to one of the pulsating direct currents I out1~ I out5 in FIGS. 5B to 9B.

[0050] As described above, the output frequency of the light-emitting diode LED driven by the light-emitting diode driver 110 of the present disclosure can satisfy the stimulation frequency of a specific demand, and by controlling the radiation output of the light-emitting diode LED so as to periodically change at a constant luminance, a scintillation stimulus having a specific frequency is hidden in the radiation output of the light-emitting diode LED. Thereby, the radiation output of the lighting device 100 has a constant luminance, can be used as general lighting, and the scintillation component hidden at a specific frequency in its radiation output can enhance human concentration, stabilize emotions, reduce stress, and / or enhance awareness, and further improve / prevent specific related diseases.

[0051] Although the present disclosure has been disclosed in the embodiments as described above, the above-described embodiments are not used to limit the present disclosure, and any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure should be based on that defined by the scope of the patent application attached later.

Explanation of Reference Numerals

[0052] In order to make the above and other objects, features, advantages, and examples of the present disclosure clearer and easier to understand, the explanation of the attached reference numerals is as follows. 100, 200, 300: Lighting device 110: Light-emitting diode driver 111: AC-DC converter 112: DC converter 113: Modulator 114: Current control circuit 115: Feedback circuit 116: Periodic signal generation circuit 117: Carrier signal generation circuit 120: Lamp board 122: Circuit board 130: Light-emitting diode load LED: Light-emitting diode AC: AC power supply S per 、S per' 、Spera , S perb , S perc : Periodic signal S cair , S cair1 , S cair2 , S cair3 , S cair4 , S cair5 : Carrier signal S mod , S mod1 , S mod2 , S mod2 , S mod4 , S mod5 , MS: Modulation signal I OUT , I OUT1 , I OUT2 , I OUT2 , I OUT4 , I OUT5 : Pulsating direct current I OUT , I OUTa , I OUTb , I OUTc : Pulsating direct current f c : Carrier frequency f m : Frequency f f : Fundamental frequency f o : Output frequency PRF: Pulse repetition frequency PRP: Pulse repetition period PDP: Pulse duration period PAP: Pulse pause period V ref : Reference voltage signal V FB : Feedback voltage signal R sen : Current sensing resistor EU: Error unit SU: Superposition unit S err : Error signal S exp : Desired signal EA: Error amplifier V comp : Compensation voltage signal MDC: Modulation circuit GD: Gate driver CS: Control signal

Claims

1. A modulator for generating a first modulation signal by modulating a carrier signal based on a periodic signal, A current control circuit including an error amplifier, a modulation circuit electrically connected to the error amplifier, and a gate driver electrically connected to the modulation circuit, wherein the current control circuit is electrically connected to a light emitting diode load, and the current control circuit is electrically connected to the modulator through one of an error unit and a superimposing unit. The error amplifier is configured to generate a compensation voltage signal based on an error signal obtained by subtracting the first modulation signal from a feedback voltage signal from the light emitting diode load by the error unit and a reference voltage signal, or the error amplifier is configured to generate the compensation voltage signal based on a desired signal generated by superimposing the first modulation signal and the reference voltage signal by the superimposing unit and the feedback voltage signal. The modulation circuit is configured to generate a second modulation signal based on the compensation voltage signal, and the gate driver is configured to generate at least one control signal based on the second modulation signal. A current control circuit, A DC converter electrically connected to the current control circuit and the light emitting diode load, and configured to generate a pulsating direct current based on the at least one control signal and provide it to the light emitting diode load, A light emitting diode driver including.

2. The light emitting diode driver according to claim 1, wherein the pulsating direct current oscillates at a fundamental frequency within a pulse duration, and a pulse repetition frequency of the pulsating direct current is lower than the fundamental frequency.

3. The light emitting diode driver according to claim 2, wherein the fundamental frequency of the pulsating direct current corresponds to a carrier frequency of the carrier signal, and the pulse repetition frequency of the pulsating direct current corresponds to a frequency of the periodic signal.

4. The light emitting diode driver according to claim 2, wherein the pulse repetition frequency is lower than 100 Hz.

5. The light emitting diode driver according to claim 2, wherein the pulse repetition frequency is a constant value within a range of 1 Hz to 100 Hz.

6. The light emitting diode driver according to claim 1, wherein the modulator generates the first modulation signal by modulating an amplitude of the carrier signal based on the periodic signal, and the periodic signal is a square wave signal.

7. The periodic signal is a sine wave signal, the modulator performs sine wave pulse width modulation based on the periodic signal and the carrier signal to generate the first modulation signal, and the waveform of the pulsating direct current generated by the direct current converter is a sine wave pulse width modulation wave. The light emitting diode driver according to claim 1.

8. A modulator for modulating a carrier signal based on a periodic signal to generate a first modulation signal; An LED load and the modulator are electrically connected, and a current control circuit for generating at least one control signal based on a reference voltage signal, a feedback voltage signal from the LED load, and the first modulation signal; A direct current converter electrically connected to the current control circuit and the LED load, and generating a pulsating direct current based on the at least one control signal and providing it to the LED load; comprising The periodic signal is a sine wave signal, the modulator performs sine wave pulse width modulation based on the periodic signal and the carrier signal to generate the first modulation signal, and the waveform of the pulsating direct current generated by the direct current converter is a sine wave pulse width modulation wave. A light emitting diode driver.

9. The error unit is electrically connected to the error amplifier, the modulator, and the LED load. The light emitting diode driver according to claim 1.

10. The superimposing unit is electrically connected to the error amplifier, the modulator, and a reference voltage source configured to provide the reference voltage signal. The light emitting diode driver according to claim 1.

11. A lamp board including a plurality of light emitting diodes; A light emitting diode driver electrically connected to the lamp board; comprising The light-emitting diode driver includes a modulator and a current control circuit. The modulator is configured to modulate a carrier signal based on a periodic signal to generate a first modulation signal. The current control circuit includes an error amplifier, a modulation circuit electrically connected to the error amplifier, and a gate driver electrically connected to the modulation circuit. The current control circuit is electrically connected to the plurality of light-emitting diodes. The current control circuit is electrically connected to the modulator through one of an error unit and a superposition unit. The error amplifier is configured to generate a compensation voltage signal based on an error signal obtained by subtracting the first modulation signal from a feedback voltage signal from the plurality of light-emitting diodes by the error unit and a reference voltage signal, or the error amplifier is configured to generate the compensation voltage signal based on a desired signal generated by superimposing the first modulation signal and the reference voltage signal by the superposition unit and the feedback voltage signal. The modulation circuit is configured to generate a second modulation signal based on the compensation voltage signal. The gate driver is configured to generate at least one control signal based on the second modulation signal. The light-emitting diode driver is configured to generate and output a pulsating direct current based on the at least one control signal to drive the plurality of light-emitting diodes. The lighting device, wherein the pulsating direct current oscillates at a fundamental frequency within a pulse duration, and a pulse repetition frequency of the pulsating direct current is lower than the fundamental frequency.

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