CN104053271A - LED Linear Regulator Circuit with Improved Power Factor - Google Patents
LED Linear Regulator Circuit with Improved Power Factor Download PDFInfo
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- CN104053271A CN104053271A CN201310234080.2A CN201310234080A CN104053271A CN 104053271 A CN104053271 A CN 104053271A CN 201310234080 A CN201310234080 A CN 201310234080A CN 104053271 A CN104053271 A CN 104053271A
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Abstract
The present disclosure involves a device. The device includes a rectifier coupled to receive energy from an alternating current (AC) voltage source. A capacitor is coupled to the rectifier. A plurality of LEDs and a current limiter are coupled in series. The current limiter is configured to limit a current through the LEDs. The plurality of LEDs and the current limiter are collectively coupled to the capacitor in parallel. A current controller is coupled to both the capacitor and the current limiter in series. The current controller is configured to control at least a charging current of the capacitor. The device has a first current path during a first period of operation and a second current path during a second period of operation. The capacitor charges during the first period of operation and discharges during the second period of operation. The invention also provides an LED linear regulator circuit with an improved power factor.
Description
Priority data
The application be on March 12nd, 2013 submit to title for " LED LINEAR REGULATOR CIRCUIT WITH IMPROVED POWER FACTOR " (agency's reel number is 48047.133) the 61/778th, No. 043 U.S. Provisional Patent Application, its full content is hereby expressly incorporated by reference.
Technical field
Relate generally to luminescent device of the present invention, more specifically, relates to light-emitting diode (LED) linear regulating circuit with improved power factor.
Background technology
LED device used herein or LED are the semiconductor light sources of the light for generating specified wavelength or designated wavelength range.Because, life-span little such as device size is long, available energy dissipation and good durability and the favorable characteristics of reliability, make LED increased popularity.In recent years, LED has been deployed in multiple application, comprises that indicating device, optical sensor, traffic lights, wideband data send and lighting device.In the time applying voltage, LED is luminous.
LED linear regulator can be for carrying out multiple LED driving method.LED linear regulator can comprise can be by the multiple LED that exchange (AC) power drives.But traditional LED linear regulator has the defect about total light output deficiency, flicker noise and/or low power factor conventionally.These defects can cause the inefficiency of traditional LED linear regulator and the performance of reduction.
Thereby although existing LED linear regulator enough expectation objects for them conventionally, they can not meet the requirements aspect each.Continue to seek the improvement LED linear regulator of total light output with improved power factor and increase.
Summary of the invention
In order to solve existing defect in prior art, according to an aspect of the present invention, provide a kind of device, comprising: rectifier, is connected with from exchanging (AC) voltage source received energy; Capacitor, is connected with described rectifier; The multiple light-emitting diodes (LED) and the flow restricter that are connected in series, described flow restricter is configured to the electric current of LED described in restricted passage, and described multiple LED is jointly connected with described Parallel-connected Capacitor with described flow restricter; And current controller, be connected in series with described capacitor and described flow restricter, wherein, described current controller is configured at least control the charging current of described capacitor; Wherein: described device has the first current path and within the second operation cycle, has the second current path within the first operation cycle; And described capacitor charges and discharges within described the second operation cycle within described the first operation cycle.
In this device, described multiple LED drive by following electric current: within described the first operation cycle, pass through the electric current of described rectifier; And the discharging current of described capacitor within described the second operation cycle.
This device further comprises: current sensor, be connected with described current controller, and described current sensor is configured to the current strength of current controller described in sensing.
This device further comprises: voltage sensor, be connected between described rectifier and described current controller, and described voltage sensor is configured to the output voltage of rectifier described in sensing.
In this device, described flow restricter, described current controller, described current sensor and described voltage sensor are all implemented as discrete circuit unit.
In this device, on integrated circuit (IC) chip, jointly realize described flow restricter, described current controller, described current sensor and described voltage sensor.
In this device, described LED connects with matrix form.
In this device, described rectifier comprises bridge diode assembly.
In this device, described current controller is further configured to improve the phase alignment between input voltage and the input current of described device.
According to a further aspect in the invention, provide a kind of device, having comprised: rectifier, has been connected to interchange (AC) power supply; Energy-storage travelling wave tube, is connected to described rectifier; Multiple photonic devices and flow restricter, described multiple photonic devices and described flow restricter are connected in series and are jointly connected in parallel with described energy-storage travelling wave tube, and described flow restricter is configured to arrange the maximum current of described photonic device; Current controller, is connected with described energy-storage travelling wave tube, and described current controller is configured to arrange the maximum overall electric current of described energy-storage travelling wave tube and described photonic device; And current sensor, being connected with described current controller, described current sensor is configured to the current strength of current controller described in sensing; Wherein: described device has the first operation cycle of described energy-storage travelling wave tube charging and the second operation cycle of described energy-storage travelling wave tube electric discharge, and described period 1 and described second round repeat in an alternating manner; Described device has different power paths within described the first operation cycle and described the second operation cycle; Within described the first operation cycle by photonic device described in described power drives; And drive described photonic device by described energy-storage travelling wave tube within described the second operation cycle.
In this device, described photonic device comprises: multiple light-emitting diodes (LED) that series and parallel connections links together.
This device further comprises: voltage sensor, be connected to described rectifier, and described voltage sensor is configured to the output voltage of rectifier described in sensing.
In this device, described current controller, described current sensor and described voltage sensor are all implemented as discrete circuit unit.
In this device, described current controller, described current sensor and described voltage sensor are jointly implemented as a part of integrated circuit (IC).
In this device, described rectifier comprises bridge diode circuit.
In this device, described energy-storage travelling wave tube comprises electrolytic capacitor.
According to another aspect of the invention, provide a kind of circuit, had obvious difference and the first operation cycle replacing and the second operation cycle, described circuit comprises: bridge diode assembly, is configured to from AC voltage source received current; Electrolytic capacitor, is connected with described bridge diode assembly, and wherein, described capacitor charges by the electric current receiving from described AC voltage source within described the first operation cycle, and discharges within described the second operation cycle; The multiple LED and the flow restricter that are connected in series, described LED is jointly connected with described Parallel-connected Capacitor with described flow restricter; Current controller, is connected in series with described capacitor and described flow restricter, and wherein, described current controller is configured at least limit the charging current of described capacitor within described the first operation cycle; And current sensor, being connected with described current controller, described current sensor is configured to the current strength of current controller described in sensing; Wherein, described circuit had the first current path and have the second current path within described the second operation cycle within described the first operation cycle, made by multiple LED described in following current drives: the electric current being provided by described AC voltage source within described the first operation cycle; And the discharging current of described capacitor within described the second operation cycle.
In this circuit, described multiple LED connect with matrix form.
This circuit further comprises: voltage sensor, be connected between described bridge diode assembly and described current controller, and described voltage sensor is configured to the output voltage of bridge diode assembly described in sensing.
In this circuit, described current controller, described current sensor and described voltage sensor are jointly implemented as integrated circuit (IC).
Brief description of the drawings
When reading in conjunction with the accompanying drawings, understand best many aspects of the present invention by following detailed description.Should be emphasized that, according to the standard practices in industry, various parts needn't be drawn in proportion.In fact, for discuss clear for the purpose of, the size of multiple parts can be increased arbitrarily or be reduced.
Fig. 1 to Fig. 3 is according to the circuit diagram of the LED linear regulator of some embodiments of the present invention.
Fig. 4 is according to the sample rate current of capacitor in the LED linear regulator of some embodiments of the present invention and the curve chart of voltage waveform.
Fig. 5 is according to the sampling input current of the LED linear regulator of some embodiments of the present invention and the curve chart of input voltage waveform.
Fig. 6 has the sampling input current of LED linear regulator of capacity load and the curve chart of input voltage waveform.
Fig. 7 is according to the curve chart of the LED current waveform for LED linear regulator of some embodiments of the present invention.
Fig. 8 is the schematic partial cross section end view according to the exemplary L ED lighting device of many aspects of the present invention.
Fig. 9 is according to the schematic diagram of the lighting module of the LED lighting device that comprises Fig. 8 of many aspects of the present invention.
Embodiment
Should be appreciated that, below summary of the invention be provided for multiple different embodiment or the example of the different characteristic that realizes multiple embodiment.The particular instance of assembly and layout is below described, to simplify the present invention.Certainly, these are only examples, and are not used in restriction.For example, in the following description, first component above second component or on form the mode that can comprise directly contacting and form the embodiment of first component and second component, and can comprise and can between first component and second component, form optional feature, the embodiment that first component can directly not contacted with second component.And, for convenience of explanation, use term " top ", " bottom ", " below ", " top " etc., and be not intended to the scope of embodiment to be limited to any certain orientation.For simple and object clearly, multiple parts can also be drawn arbitrarily by different proportion.In addition, the present invention can be in Multi-instance repeat reference numerals and/or letter.This repeats is for simple and object clearly, and itself does not specify the relation between discussed various embodiments and/or structure.
In the time of light-emitting diode (LED) break-over of device, it can send such as the radiation of the light of the different colours in visible spectrum and have ultraviolet ray or the radiation of Infrared wavelength.For example, compare with conventional light source (, incandescent lamp bulb), that LED provides is less such as size, energy consumption is lower, the life-span is longer, the advantage of multiple available color and durability and better reliability.In recent years, these advantages and make the progress of the LED manufacturing technology that LED is more cheap and more stable increase the increased popularity of LED.
But existing LED lighting device still may have specified disadvantages.For example, LED linear regulator (the LED illumination application of a type) can comprise the multiple LED that are electrically connected in series in together.Drive these LED by AC power supplies, to generate light output.But traditional LED linear regulator has the not enough and excessive defect of flicker noise or the power factor that reduces of light output, thus can cause invalid.
According to many aspects of the present invention, the LED linear regulator that substantially overcomes above-mentioned these problems is below described.Fig. 1 to Fig. 7 comprises according to multiple voltage and the current waveform of the circuit diagram of some embodiment and LED linear regulator.In order to understand better invention thought of the present invention, these accompanying drawings are simplified.
With reference to figure 1, the circuit diagram of LED linear regulator 100 is shown.By for example energy of AC voltage source 110 (or power supply) driving LED linear regulator 100.In certain embodiments, AC voltage source 110 provides 60 hertz (Hz), 120 volts of AC voltages.In other embodiments, AC voltage source 110 can provide the different AC voltages of identical or different frequency.For example, can provide in other embodiments 120 volts of AC voltages.Should be appreciated that, other suitable energy also can be in optional embodiment.
LED linear regulator 100 comprises rectifier, for example, and bridge diode assembly 115.Bridge diode assembly 115 is electrically connected to AC voltage source 110.Bridge diode assembly 115 is configured to the AC sinusoidal voltage of exporting from AC voltage source 110 to be converted to " M-shape " voltage.In other words, other embodiment of bridge diode assembly 115(or rectifier) be configured to AC output to be converted to direct current (DC) output.In optional embodiment, replace or except bridge diode assembly 115, can realize the rectifier of other adequate types, so that the AC output of AC voltage source 110 is converted to and expects DC output.
LED linear regulator 100 comprises that multiple LED(are also called as LED string) 120.These LED 120 jointly electrically connect as matrix (in parallel and series connection).LED 120 is also electrically connected to bridge diode assembly 115.LED 120 can be used as the output loading of LED linear regulator 100, and in the time being switched on, luminous.
LED linear regulator 100 comprises flow restricter 125.Flow restricter 125 is configured to the amount of the electric current that limits the LED 120 that flows through, to prevent that LED 120 from suffering damage.In certain embodiments, realize flow restricter 125 as one or more discrete circuit elements.In other embodiments, flow restricter 125 is integrated in integrated circuit (IC) chip.
LED linear regulator 100 comprises energy-storage travelling wave tube.In an illustrated embodiment, energy-storage travelling wave tube comprises capacitor 130, such as, electrolytic capacitor 130.In other embodiments, dissimilar capacitor or other suitable energy storage devices can be used as energy-storage travelling wave tube.Capacitor 130 is electrically connected with LED 120 and flow restricter 125 in parallel.Capacitor 130 can also be called as input capacitor.Such as the energy-storage travelling wave tube of capacitor 130 can be within the different operating cycle charging and discharging.Due to the charge/discharge characteristics of capacitor 130, as discussed in more detail below, this capacitor is in this article for increasing total light output.
LED linear regulator 100 has voltage sensor 135.Voltage sensor 135 is configured to the output voltage (or input voltage of LED linear regulator 100) of sensing bridge diode 115.Voltage sensor 135 can be configured to make input current to be more tending towards sinusoidal.In certain embodiments, voltage sensor 135 can be omitted, to reduce circuit complexity and to reduce costs.
LED linear regulator 100 is included in the current controller 140 of electrical connection between voltage sensor 135 and capacitor 130.In various embodiments, current controller 140 can include but not limited to one or more in following microelectronic circuit component: comparator, feedback circuit, power input circuit, drive circuit and output circuit.Current controller 140, voltage sensor 135, current sensor 145 and flow restricter 125 all can be integrated in the integrated circuit (IC) chip such as application-specific integrated circuit (ASIC) (ASIC) chip.
In one aspect, current controller 140 is by the flow through total amount protection linear regulator 100 of electric current of linear regulator 100 of restriction.This comprises the electric current (it is also by flow restrictors limit) of the electric current of the capacitor 130 of flowing through and the LED 120 that flows through.But, should be appreciated that, discuss in more detail below with reference to Fig. 3 at linear regulator 100() discharge cycle in, current controller 140 can not be active, and flow restricter 125 is by the flow through current protection LED 120 of LED 120 of restriction.
In another aspect, current controller 140 is configured to force input current waveform substantially to follow (, phase alignment) input voltage waveform.More specifically, in the conventional linear adjuster without capacitor 130, load is mainly ohmic, and therefore electric current and voltage are aimed at.This causes good power factor, and power factor can be defined as (effective power of the load of flowing through) and the ratio of (apparent power in circuit).Effective power can not exceed the apparent power in circuit, and therefore, power factor is the dimensionless number of fluctuation between 0 to 1.Conventionally the validity of the power-factor measurement circuit of circuit.But, for the conventional linear adjuster that there is no capacitor 130, only when input voltage is during higher than total forward voltage of LED, driving LED.Therefore, reduced effective fluorescent lifetime (in the time of LED conducting).Impact is, LED has lower total light output, and experience flicker noise problem (, the not expectational cycle of light output is dimmed).
Here, the existence of capacitor 130 is used for driving AC source 110 as LED linear regulator 100() capacity load.Capacitor 130 charges in the charge cycle (discussing in more detail below with reference to Fig. 2) of LED linear regulator 100, and in the discharge cycle of LED linear regulator 100, is provided for the energy of LED 120.Thereby, significantly improve the light output performance for LED, and LED flicker noise problem is minimized substantially.But, according to circuit theory, the phase place that capacity load (about this point, or inductive load) can cause electric current by with the phase place misalignment (otherwise resistive load can cause the phase place of electric current and the phase alignment of voltage) of voltage.The phase place misalignment meeting of electric current and voltage causes the power factor reducing, and reduces thus the efficiency of circuit.
Here,, according to many aspects of the present invention, current controller 140, by the resistance of itself and by limiting capacitance device charging current, makes total load show more as resistive load.Thereby, more close alignment of the phase place of input current and input voltage, the thus power factor of increasing circuit and make circuit more effective.
LED linear regulator 100 comprises the current sensor 145 that is electrically connected to current controller 140.In certain embodiments, current sensor 145 can comprise resistor.Current sensor 145 is configured to the amount of senses flow through the electric current of current controller 140.Current sensor 145 induced electricity flow valuves and feedback is offered to current controller 140.Should be appreciated that, current controller 140 and current sensor 145 all can comprise multiple pins (for electrical connection) that needn't illustrate herein.Some ground connection in these pins, and other pins can be connected to other circuit elements.
As mentioned above, in various embodiments, flow restricter 125, voltage sensor 135, current controller 140 and current sensor 145 all may be implemented as discrete elements, or can be integrated on IC chip.In certain embodiments, one or more can being jointly integrated in application-specific integrated circuit (ASIC) (ASIC) chip in voltage sensor 135, current controller 140 and current sensor 145, for example, the asic chip 150 that dotted outline is as shown in Figure 1 described.If desired, this asic chip 150 can integrated flow restricter 125.
And as mentioned above, LED linear regulator 100 has two different current paths corresponding to two different time cycles.Within the cycle very first time (after this, being called T1), input voltage is greater than the voltage of capacitor 130.Therefore, capacitor 130 charges within this T1 time period.Figure 2 illustrates the current path in (, arrow) this T1 cycle.
Within the second time cycle (after this, being called T2), input voltage is lower than the voltage of capacitor 130.Therefore, capacitor 130 discharges within this T2 time period.Input current stops.The electric current of the LED 120 that flows through is provided by discharging capacitor 130 now.Figure 3 illustrates (that is, this circulation, it is the partial circuit of LED linear regulator 100) current path in this T2 cycle.Should be appreciated that, T1 and T2 are corresponding to steady state operation, and repetition in an alternating manner.
Fig. 4 illustrates when through above-mentioned T1(charging) and T2(discharge) electric current and the voltage waveform of capacitor 130 when the time cycle.More specifically, Fig. 4 comprises X-axis and the curve Figure 200 in conjunction with (superimposed) two Y-axis (Y1 and Y2) together.In an illustrated embodiment, X-axis represents the time, and Y1 axle represents condenser voltage, and Y2 axle represents condenser current.Curve Figure 200 comprises voltage waveform 210, as the curve chart of Y1 axle and X-axis.Voltage waveform 210 represents that the voltage of capacitor 130 is about the change of time.Curve Figure 200 also comprises current waveform 220, as the curve chart of Y2 axle and X-axis.Current waveform 220 represents that the electric current of capacitor 130 is about the change of time.
Voltage waveform 210 and current waveform 220 include multiple cycles.Each cycle was made up of T1 cycle and T2 cycle.As shown in Figure 4, within the T1 cycle, the electric current of the capacitor 130 of flowing through is greater than zero (being indicated higher than zero current line 230 by current waveform 220).Therefore, capacitor 130 charges within the T1 cycle.Within the T2 cycle, the electric current of the capacitor 130 of flowing through is less than zero (indicating lower than zero current line 230 by current waveform 220), means reverse direction current flow.Therefore, capacitor 130 discharges within the T2 cycle.
Fig. 5 illustrates for the input current waveform of LED linear regulator 100 and input voltage waveform.More specifically, Fig. 5 comprises X-axis and the curve chart 250 of two Y-axis (Y1 and Y2) of combining.In an illustrated embodiment, X-axis represents the time, and Y1 axle represents input voltage, and Y2 axle represents input current.Curve chart 250 comprises voltage waveform 260, as the curve chart of Y1 axle and X-axis.In other words, voltage waveform 260 represents the change of input voltage about the time.Curve chart 250 also comprises current waveform 270, as the curve chart of Y2 axle and X-axis.In other words, current waveform 270 represents the change of input current about the time.Note, input current waveform 270 has the peak value (for example, peak value 275) being arranged by the current controller 140 of Fig. 1.
If only capacitor 130 is connected to bridge diode assembly 115, load is electric capacity completely, and it can cause the phase place misalignment between input voltage and input current.This is shown in Figure 6, and wherein, waveform 260A and 270A represent respectively input voltage and the input current of the LED linear regulator for having capacity load.Can as seen from Figure 6, between input voltage and input current, there is master phase misalignment (being indicated by the horizontal shift between waveform 260A and 270A).As mentioned above, do not expect such phase place misalignment of causing due to capacitor control load, therefore drop-down power factor.
But the existence of current controller 140 makes overall load have more resistives and capacitive character still less.As shown in Figure 5, resistive load means that the phase place of input voltage and input current will aim at mutually.Therefore the current controller 140 of, realizing herein reduces the phase place misalignment between input voltage and input current substantially.This improves the power factor of LED linear regulator and has improved its efficiency.
Fig. 7 illustrates the current waveform of the LED 120 of Fig. 1.More specifically, Fig. 7 is the curve chart 280 that comprises X-axis and Y-axis.In an illustrated embodiment, X-axis represents the time, and Y-axis represent the to flow through electric current of LED 120.Thereby curve chart 280 has LED current waveform 285, as the curve chart of Y-axis and X-axis.Can be as can be seen from Figure 7, LED electric current herein has nonzero value (, waveform 285 never drops to below 0 line) always.This is at least partly due to the fact that: in the time that capacitor 130 charges, AC voltage source 110(Fig. 1) be provided for the electric current of LED 120 and in the time that capacitor 130 discharges, capacitor is provided for the electric current of LED 120.Therefore,, as long as 100 conductings of LED linear regulator, LED 120 just has the non-zero current of at least one tittle always.Similarly, LED linear regulator 100 runs through its operation and has enough light output, and can substantially eliminate flicker noise problem.
Should be appreciated that, the multiple electric current shown in Fig. 4 to Fig. 7 and voltage waveform are only examples, to help to illustrate some concept of the present invention.In multiple other embodiment, shape, size and/or the phase place of these electric currents and voltage waveform can change, and do not deviate from the spirit and scope of the present invention.
The LED linear regulator of discussing according to embodiment disclosed herein provides the advantage that exceedes existing LED linear regulator.But, should be appreciated that, needn't discuss all advantages herein, and different embodiment can provide attendant advantages, and there is no certain benefits be that all embodiment need to possess.
In multiple advantage, an advantage is, current controller can make overall load show as more resistive, reduces thus the phase place misalignment between input current and input voltage.As a result, improve the power factor of LED linear regulator, and also improved the efficiency of LED linear regulator.Another advantage is, in the time of electric discharge, at least in part due to the electric current being provided by capacitor, causes LED electric current to have nonzero value always.Therefore, can substantially eliminate the flicker noise problem of some traditional LED linear regulator of puzzlement.The disclosed embodiments also easily and simply realize in this article, therefore, not obvious on the impact of manufacturing cost.
LED 120 may be implemented as a part for lighting device.For example, LED 120 may be implemented as a part for LED-based lighting device 300, and shown in Figure 8 its simplified sectional view.
LED tube core 120 includes the semiconductor layer of two doping with dissimilar conductivity.According to many aspects of the present invention, the semiconductor layer of these doping can be above-mentioned III-V compounds of group layer 220, or can use above-mentioned similar technique to form the semiconductor layer of these doping.LED tube core 120 also includes multiple quantum well (MQW) layer being arranged between these III-V compounds of group layers.Mqw layer includes alternately (or cycle) layer of source material, such as, gallium nitride and InGaN (InGaN).For example, mqw layer can comprise multiple gallium nitride layers and multiple gallium indium nitride layer, wherein, and to replace or periodic manner formation gallium nitride layer and gallium indium nitride layer.In certain embodiments, mqw layer comprises ten layers of gallium nitride and ten layers of InGaN, wherein, forms gallium indium nitride layer on gallium nitride layer, and on gallium indium nitride layer, forms another gallium nitride layer etc.Luminous efficiency depends on the number of plies and the thickness of alternating layer.
In the time that voltage (or electric charge) is applied to the doped layer of LED, mqw layer sends the radiation such as light.The color of the light being sent by mqw layer is corresponding to the wavelength of radiation.Radiation can be such as, the visible ray of blue light, or such as the invisible light of ultraviolet ray (UV) light.The composition and structure that can form the material of mqw layer by change regulates light wavelength (thereby and color of light).
Should be appreciated that, each LED tube core can also comprise prestrain layer and electronic barrier layer.Prestrain layer can be doped, and can, for discharging stress, and reduce the quantum limit Stark effect (QCSE) (describing the impact of external electrical field according to the optical absorption spectra of quantum well) in mqw layer.Electronic barrier layer can comprise aluminium gallium nitride alloy (AlGaN) material of doping, and wherein, dopant can comprise magnesium.Electronic barrier layer helps to be limited in the electron hole charge carrier combination again in mqw layer, thereby can improve the quantum efficiency of mqw layer and reduce the not radiation of desired bandwidth.
In certain embodiments, LED tube core 120 all has the phosphorescent layer applying thereon.Phosphorescent layer can comprise phosphor material and/or fluorescent material.Can for example, in concentrated viscous fluid medium (, liquid glue) phosphorescent layer be coated on the surface of LED tube core 120.In the time that viscous fluid is fixed or harden, phosphor material becomes a part for LED packaging part.In actual LED application, the color of the light that phosphorescent layer can be sent by LED tube core 120 for conversion.For example, phosphorescent layer can be transformed to different wavelengths of light by the blue light being sent by LED tube core 120.By changing the material composition of phosphorescent layer, can realize the expectation light color being sent by LED tube core 120.
LED tube core 120 is arranged on substrate 320.In certain embodiments, substrate 320 comprises metal-core printed circuit board (MCPCB).MCPCB comprises metallic substrates, and it can be made up of aluminium (or its alloy).But MCPCB also comprises the dielectric layer of the heat conduction electric insulation being arranged in metallic substrates.MCPCB can also comprise and is arranged on the thin metal layer being made of copper on dielectric layer.In optional embodiment, substrate 320 can comprise other suitable conductive structures.Substrate 320 can comprise or can not include source circuit, and can interconnect for setting up.
Lighting device 300 comprises diffusion covering (diffuser cap) 350.Diffusion covering 350 is provided for the lid of the LED tube core 120 under it.In other words, by diffusion covering 350 and jointly packaged LED tube core 120 of substrate 320.In certain embodiments, diffusion covering 350 has surface or the profile of arc.In certain embodiments, curved surface can be followed the profile of semicircle substantially, makes the per pass light beam being sent by LED tube core 120 can for example, arrive the surface of diffusion covering 350 with substantially vertical incidence angle (, within 90 several years).The arcuate shape of diffusion covering 350 helps to reduce the total internal reflection (TIR) of the light being sent by LED tube core 120.
Diffusion covering 350 can have grain surface.For example, grain surface roughening can be made, or multiple little patterns can be comprised, such as, polygon or circle.The light that such grain surface helps dispersion to be sent by LED tube core 120, so that light distribution is more even.In certain embodiments, diffusion covering 350 is coated with the diffusion layer containing granule proliferation (diffuser particle).
In certain embodiments, fill the space 360 between LED tube core 120 and diffusion covering 350 by air.In other embodiments, can carry out packing space 360 by optical grade silica gel material (being also called as optical gel).In this embodiment, phosphorescent particle can be blended in optical gel, further to spread the light being sent by LED tube core 120.
Although shown embodiment illustrates all LED tube cores 120 and is encapsulated in single diffusion covering 350, should be appreciated that, in other embodiments, can use multiple diffusion coverings.For example, each LED tube core 120 can be encapsulated in corresponding in multiple diffusion coverings.
Lighting device 300 can also optically comprise catoptric arrangement 370.Catoptric arrangement 370 can be arranged on substrate 320.In certain embodiments, catoptric arrangement is shaped as similar cup, and therefore can also be called as reflector.While watching from vertical view, catoptric arrangement with 360 degree around or around LED tube core 120 and diffusion covering 350.While watching from vertical view, catoptric arrangement 370 can have circular contour, cellular hexagonal outline or the suitable cellular profile of another kind around diffusion covering 350.In certain embodiments, LED tube core 120 and diffusion covering 350 are positioned near the bottom of catoptric arrangement 370.In other words, the top of catoptric arrangement 370 or upper opening are positioned at above LED tube core 120 and diffusion covering 350.
Catoptric arrangement 370 operationally reflects the light of propagating out from diffusion covering 350.In certain embodiments, the inner surface of catoptric arrangement 370 is coated with reflectance coating, such as, aluminium, silver or their alloy.Should be appreciated that, in certain embodiments, to be similar to the mode of the grain surface that spreads covering 350, the surface of the sidewall of catoptric arrangement 370 can be veined.Thereby catoptric arrangement 370 is operationally carried out the further scattering of the light being sent by LED tube core 120, thereby reduce the intensity (glare) of the light output of lighting device 300, and make light output softer for the mankind's eyes.In certain embodiments, the sidewall of catoptric arrangement 370 has the profile of inclination or wedge shape.The wedge profile of catoptric arrangement 370 improves the light reflection efficiency of catoptric arrangement 370.
Lighting device 300 comprises radiator structure 380, is also called as radiator 380.Radiator 380 is thermally coupled to its Heat of Formation during operation of LED tube core 120(by substrate 320).In other words, radiator 380 is attached to substrate 320, or substrate 320 is positioned on the surface of radiator 380.Radiator 380 is configured to promote the dissipation of heat to ambient air.Radiator 380 comprises heat conducting material, such as metal material.The shape of radiator 380 and physical dimension can be designed to the framework of the bulb that provides common and diffuse out or derive heat from LED 120 simultaneously.In order to strengthen heat transmission, radiator 380 can have multiple fins 390 of outwards giving prominence to from the main body of radiator 380.Fin 390 can have that to be exposed to ambient air long-pending with the exhibiting high surface that contributes to heat to transmit.
Fig. 9 illustrates the rough schematic view of the lighting module 500 of some embodiment that comprise above-mentioned lighting device 300.Lighting module 500 has pedestal 510, is attached to main body 520 and the attached lamp 530 that is attached to main body 520 of pedestal 510.In certain embodiments, lamp 530 is shot-light (or Down lamp lighting modules).Lamp 530 comprises the above lighting device of discussing with reference to figure 8 300.Operationally projecting beam 540 effectively of lamp 530.In addition, compared with conventional incandescent, lamp 530 can provide better durability and longer life-span.
Should be appreciated that, other illumination application can be benefited from the LED that uses the invention described above.For example, LED of the present invention can use in illumination application, includes but not limited to the light source of headlight for vehicle or taillight, vehicular meter panel display, projecting apparatus, light source, flat computer, mobile phone or notebook/laptop such as the electronic equipment of liquid crystal display (LCD) TV or LCD watch-dog.
An aspect of of the present present invention relates to a kind of device.This device comprises: rectifier, is connected to receive the energy from alternation (AC) voltage source; Capacitor, is connected to rectifier; The multiple LED and the flow restricter that are connected in series, wherein, flow restricter is configured to limit the electric current of the LED that flows through, and wherein, multiple LED and flow restricter are connected to capacitor concurrently jointly; And current controller, be connected in series to capacitor and flow restricter, wherein, current controller is configured at least charging current of control capacitor; Wherein: this device has the first current path in the first operation cycle and the second current path in the second operation cycle; And capacitor charges and discharges within the second operation cycle within the first operation cycle.
In certain embodiments, multiple LED are by following current drives: the electric current of the rectifier of flowing through within the first operation cycle; And the discharging current of capacitor within the second operation cycle.
In certain embodiments, this device further comprises: current sensor, be connected to current controller, and current sensor is configured to the current strength of current sensor controller.In certain embodiments, this device further comprises: voltage sensor, be connected between rectifier and current controller, and voltage sensor is configured to the output voltage of sensing rectifier.In certain embodiments, current controller, current sensor and voltage sensor are all implemented as discrete circuit components.In certain embodiments, on integrated circuit (IC) chip, jointly realize current controller, current sensor and voltage sensor.
In certain embodiments, LED is connected to matrix.
In certain embodiments, rectifier comprises bridge diode assembly.
In certain embodiments, current controller is further configured to increase the phase alignment between input voltage and the input current of device.
In certain embodiments, this device comprises linear power adjuster.The circuit of power governor can be the available modules separating with LED.In other embodiments, can be integrated into individual devices for the circuit of power governor and LED.
Another aspect of the present invention relates to a kind of device.This device comprises: rectifier, is connected to interchange (AC) energy; Energy-storage travelling wave tube, is connected to rectifier; Multiple photonic devices and flow restricter, be connected in series and be jointly connected in parallel energy-storage travelling wave tube, and flow restricter is configured to be provided for the maximum current of photonic device; Current controller, is connected to energy-storage travelling wave tube, and current controller is configured to be provided for the maximum overall electric current of energy-storage travelling wave tube and photonic device; And current sensor, being connected to current controller, current sensor is configured to the current strength of current sensor controller; Wherein: this device has the first operation cycle of energy-storage travelling wave tube charging and the second operation cycle of energy-storage travelling wave tube electric discharge, and the first and second cycles repeated in an alternating manner; This device has different power paths within the first and second operation cycles; Within the first operation cycle, drive photonic device by energy source; And drive photonic device by energy-storage travelling wave tube within the second operation cycle.
In certain embodiments, multiple light-emitting diodes (LED) that photonic device comprises series and parallel connections and links together.
In certain embodiments, this device further comprises: voltage sensor, be connected to rectifier, and voltage sensor is configured to the output voltage of sensing rectifier.In certain embodiments, current controller, current sensor and voltage sensor are all implemented as discrete circuit components.In certain embodiments, current controller, current sensor and voltage sensor are embodied as a part of integrated circuit (IC) jointly.
In certain embodiments, rectifier comprises bridge diode circuit.
In certain embodiments, energy-storage travelling wave tube comprises electrolytic capacitor.
Another aspect of the present invention relates to the circuit in the first and second operation cycles that have obvious difference and replace.This circuit comprises: bridge diode assembly, is configured to from AC voltage source received current; Electrolytic capacitor, is connected to bridge diode assembly, wherein, within the first operation cycle, by the electric current receiving from AC voltage source, capacitor is charged, and within the second operation cycle this capacitor discharge; The multiple LED and the flow restricter that are connected in series, LED and flow restricter are connected to capacitor in parallel jointly; Current controller, is connected in series with capacitor and flow restricter, and wherein, current controller is configured within the first operation cycle at least charging current of limiting capacitance device; And current sensor, being connected to current controller, current sensor is configured to the current strength of current sensor controller; Wherein, circuit has the first current path within the first operation cycle and the second current path within the second operation cycle, makes multiple LED by following current drives: the electric current being provided by AC voltage source within the first operation cycle; And the discharging current of capacitor within the second operation cycle.
In certain embodiments, multiple LED are connected to matrix.
In certain embodiments, circuit further comprises: voltage sensor, be connected between bridge diode assembly and current controller, and voltage sensor is configured to the output voltage of sensing bridge diode assembly.In certain embodiments, current controller, current sensor and voltage sensor are embodied as integrated circuit (IC) jointly.
More than summarize the feature of multiple embodiment, made those skilled in the art can understand better following detailed description.It should be appreciated by those skilled in the art that they can easily design or revise as basis with the present invention for realizing the object identical with embodiment in this introduction and/or realizing other techniques and the structure of the advantage identical with it.Those skilled in the art it should further be appreciated that, such equivalent structure does not depart from the spirit and scope of the present invention, and they can without departing from the spirit and scope of the present invention, make multiple change, replacement and change at this.
Claims (10)
1. a device, comprising:
Rectifier, is connected with from exchanging (AC) voltage source received energy;
Capacitor, is connected with described rectifier;
The multiple light-emitting diodes (LED) and the flow restricter that are connected in series, described flow restricter is configured to the electric current of LED described in restricted passage, and described multiple LED is jointly connected with described Parallel-connected Capacitor with described flow restricter; And
Current controller, is connected in series with described capacitor and described flow restricter, and wherein, described current controller is configured at least control the charging current of described capacitor;
Wherein:
Described device has the first current path and within the second operation cycle, has the second current path within the first operation cycle; And
Described capacitor charges and discharges within described the second operation cycle within described the first operation cycle.
2. device according to claim 1, wherein, described multiple LED drive by following electric current:
Within described the first operation cycle, pass through the electric current of described rectifier; And
The discharging current of described capacitor within described the second operation cycle.
3. device according to claim 1, further comprises: current sensor, be connected with described current controller, and described current sensor is configured to the current strength of current controller described in sensing.
4. device according to claim 3, further comprises: voltage sensor, be connected between described rectifier and described current controller, and described voltage sensor is configured to the output voltage of rectifier described in sensing.
5. device according to claim 4, wherein, described flow restricter, described current controller, described current sensor and described voltage sensor are all implemented as discrete circuit unit.
6. device according to claim 4 wherein, is jointly realized described flow restricter, described current controller, described current sensor and described voltage sensor on integrated circuit (IC) chip.
7. device according to claim 1, wherein, described LED connects with matrix form.
8. device according to claim 1, wherein, described rectifier comprises bridge diode assembly.
9. a device, comprising:
Rectifier, is connected to interchange (AC) power supply;
Energy-storage travelling wave tube, is connected to described rectifier;
Multiple photonic devices and flow restricter, described multiple photonic devices and described flow restricter are connected in series and are jointly connected in parallel with described energy-storage travelling wave tube, and described flow restricter is configured to arrange the maximum current of described photonic device;
Current controller, is connected with described energy-storage travelling wave tube, and described current controller is configured to arrange the maximum overall electric current of described energy-storage travelling wave tube and described photonic device; And
Current sensor, is connected with described current controller, and described current sensor is configured to the current strength of current controller described in sensing;
Wherein:
Described device has the first operation cycle of described energy-storage travelling wave tube charging and the second operation cycle of described energy-storage travelling wave tube electric discharge, and described period 1 and described second round repeat in an alternating manner;
Described device has different power paths within described the first operation cycle and described the second operation cycle;
Within described the first operation cycle by photonic device described in described power drives; And
Within described the second operation cycle, drive described photonic device by described energy-storage travelling wave tube.
10. a circuit, has obvious difference and the first operation cycle replacing and the second operation cycle, and described circuit comprises:
Bridge diode assembly, is configured to from AC voltage source received current;
Electrolytic capacitor, is connected with described bridge diode assembly, and wherein, described capacitor charges by the electric current receiving from described AC voltage source within described the first operation cycle, and discharges within described the second operation cycle;
The multiple LED and the flow restricter that are connected in series, described LED is jointly connected with described Parallel-connected Capacitor with described flow restricter;
Current controller, is connected in series with described capacitor and described flow restricter, and wherein, described current controller is configured at least limit the charging current of described capacitor within described the first operation cycle; And
Current sensor, is connected with described current controller, and described current sensor is configured to the current strength of current controller described in sensing;
Wherein, described circuit had the first current path and have the second current path within described the second operation cycle within described the first operation cycle, made by multiple LED described in following current drives:
The electric current being provided by described AC voltage source within described the first operation cycle; And
The discharging current of described capacitor within described the second operation cycle.
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| US201361778043P | 2013-03-12 | 2013-03-12 | |
| US61/778,043 | 2013-03-12 | ||
| US13/800,958 | 2013-03-13 | ||
| US13/800,958 US9148916B2 (en) | 2013-03-12 | 2013-03-13 | LED linear regulator circuit with improved power factor |
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| CN104053271A true CN104053271A (en) | 2014-09-17 |
| CN104053271B CN104053271B (en) | 2016-12-28 |
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| CN106255279A (en) * | 2016-10-18 | 2016-12-21 | 昆山国显光电有限公司 | Lighting circuit |
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Effective date of registration: 20151130 Address after: Taiwan, Hsinchu, China Science Park Four line 9 Applicant after: Jingyuan Optoelectronics Co., Ltd. Address before: Hsinchu, Taiwan, China Applicant before: Tsmc Solid State Lighting Ltd. |
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