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WO2013104250A1 - 交流电直接恒流驱动的白光led发光装置 - Google Patents

交流电直接恒流驱动的白光led发光装置 Download PDF

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Publication number
WO2013104250A1
WO2013104250A1 PCT/CN2012/087390 CN2012087390W WO2013104250A1 WO 2013104250 A1 WO2013104250 A1 WO 2013104250A1 CN 2012087390 W CN2012087390 W CN 2012087390W WO 2013104250 A1 WO2013104250 A1 WO 2013104250A1
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WO
WIPO (PCT)
Prior art keywords
led
unit
current
alternating current
constant current
Prior art date
Application number
PCT/CN2012/087390
Other languages
English (en)
French (fr)
Inventor
李东明
杨冕
封正勇
龙文涛
赵昆
张明
Original Assignee
四川新力光源股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 四川新力光源股份有限公司 filed Critical 四川新力光源股份有限公司
Priority to US14/371,278 priority Critical patent/US9386639B2/en
Priority to EP12864823.5A priority patent/EP2824996A4/en
Priority to RU2014132442A priority patent/RU2628007C2/ru
Publication of WO2013104250A1 publication Critical patent/WO2013104250A1/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present invention relates to an LED (Light Emitting Diode) illuminating device, and more particularly to an AC direct current constant driving technique for an LED illuminating device.
  • LED Light Emitting Diode
  • LED As a new type of solid-state light source, LED is expected to become a new generation of illumination source with its advantages of energy saving, environmental protection and long life. As we all know, the existing LEDs are almost all driven by DC, and our production and living electricity is AC. Therefore, in the currently used LED products, a power converter is required to convert the alternating current into direct current. The introduction of power converters has many negative effects. First, the life of the power converter is much lower than the life of the LED itself, which shortens the service life of the lighting device. Second, the power converter reduces the efficiency of the lighting device. Third, in low power applications, power conversion The device will cause a drop in power factor and an increase in total harmonic distortion of the current. In order to give full play to the advantages of semiconductor lighting, LED light-emitting devices that can be directly driven by alternating current have become the current research hotspots.
  • the LED components are connected in a reverse parallel or bridge rectified circuit topology to meet the AC power drive requirements.
  • the AC power fluctuates periodically according to a certain frequency. Due to the presence of the LED's own turn-on voltage, the LED will turn on and emit light when the instantaneous voltage exceeds the turn-on voltage. Conversely, the LED is off and not illuminated. This circuit makes the LED's luminous efficiency very low, and the illuminating flicker occurs with the AC voltage fluctuation.
  • the driving current of the LED fluctuates with the fluctuation of the AC voltage, which causes a change in brightness when the LED emits light, and a phenomenon of illuminating and flickering occurs.
  • the core of the LED device is a PN junction diode whose IV characteristic is an approximate exponential function.
  • the current flowing through the PN junction increases exponentially.
  • the turn-on voltage of the LED will decrease when the junction temperature of the LED rises, and the forward current of the LED increases sharply due to the constant input voltage, and the LED will be severe when it is severe.
  • the PN junction causes thermal breakdown and permanent damage. Description of the specification
  • the technical problem to be solved by the present invention is to provide a white LED light-emitting device for direct current constant current driving of alternating current, aiming at the problem that the prior art AC directly drives the LED light-emitting device.
  • the white light LED lighting device driven by the alternating current direct current constant comprises an alternating current input end, a protection unit and a rectifying unit, wherein the first output end of the rectifying unit is a first branch, a second branch, an ... nth branch are connected in parallel between the second output end, the first branch routing first LED module and the first constant current unit are connected in series, the second branch The second LED module and the second constant current unit are connected in series, wherein the nth routing nth LED module and the nth constant current unit are connected in series, and each constant current unit is connected to the sampling unit, where n ⁇ l , and is an integer;
  • the AC input terminal is used for connecting an alternating current to provide an operating current for the device
  • the protection unit is connected to the AC input terminal to provide a protection function for the device
  • the rectifying unit is connected to the protection unit, and rectifies the alternating current output by the protection unit;
  • the sampling unit is configured to sample the output voltage of the rectifying unit, and output a control signal to each constant current unit; each constant current unit is connected to the sampling unit, and the current of the corresponding branch is constant and is connected according to the control signal output by the sampling unit. Or turn off the corresponding branch;
  • the LED module is composed of an LED array, and the LED in the LED array is an LED with controllable illumination life.
  • the parallel branches formed by the n LED modules and the series constant current units are connected at the output end of the rectifier circuit, and the current value of the branch constant current unit is set and turned off, By turning on the voltage, periodic flickering caused by AC voltage changes can be avoided. Since the current of each branch is constant, the LEDs in the LED module do not cause current changes due to changes in junction temperature, which improves the reliability of the LED. Through theoretical analysis, it can be known that the increase in the number of branches can make the driving current waveform close to a sine wave, improving the power factor and efficiency of the illuminating device. In particular, LED modules with luminescence lifetime controllable LEDs can further overcome the LED flicker caused by AC by using LED illuminating afterglow, and improve the efficiency of LED illuminators and extend the service life of LEDs.
  • the illuminating lifetime of the LED with an illuminating lifetime is 1 to 100 ms.
  • the extension of the LED illuminating life is beneficial to overcome the flicker phenomenon.
  • the illuminating lifetime is 10 to 30 ms.
  • the LED array is composed of at least one LED disposed on the same printed circuit board, or at least one LED integrally packaged on the same substrate, or at least one LED integrated on the same semiconductor substrate Composition.
  • LEDs in the LED module are integrally packaged on the same substrate, which means that all the LEDs in the LED module are secondarily packaged and integrated on the same heat dissipation substrate; all the LEDs in the LED module are integrated in On the same semiconductor substrate, this is achieved by using a semiconductor integrated circuit process to achieve LED integration on the same semiconductor substrate.
  • each LED module is connected in parallel and/or in series.
  • the appropriate combination of LEDs in the LED module can adapt to the AC direct drive environment, and easily adjust the current and voltage parameters of each LED module.
  • the number of LEDs included in the first LED module, the second LED module, ... the nth LED module are I 2 , 2 2 , ... n 2 , respectively, and the corresponding constant current unit currents are respectively I , 21, ... nl ; I is the first constant current unit current.
  • This distribution of the number of LEDs in the LED module can achieve a multiple relationship of the branch currents, making the total current waveform close to a sine wave, which is beneficial to improve the power factor and efficiency of the light-emitting device.
  • the same LED belongs to different LED modules at the same time.
  • the solution can arrange the LEDs in each LED module in a staggered manner, so that the same or several LEDs belong to different LED modules at the same time, realize multiplexing of LEDs, can reduce the number of LEDs of the light-emitting device, and improve the brightness of the light-emitting device. Hook, it is good to overcome the flicker phenomenon.
  • the protection unit includes a fuse and/or a varistor, the fuse is connected in series at the AC input end, and the varistor is connected in parallel at the AC input end.
  • Fuses are commonly used current-limiting protection components, and varistors are commonly used voltage-limiting protection components. Their combination can achieve the most basic current limiting and voltage limiting protection, and the cost is low, the installation is convenient, and secondary integration is facilitated.
  • the protection unit further includes a common mode choke coil and/or a gas discharge tube, the common mode choke coil is connected in series at the AC input end, and the gas discharge tube is connected in parallel at the AC input end.
  • the common mode choke and the gas discharge tube are added, and the common mode choke can suppress the common mode interference, and the gas discharge tube can protect the illumination device from being damaged by lightning.
  • the rectifying unit is composed of a full-wave rectifying circuit or a half-wave rectifying circuit composed of a rectifying diode.
  • the rectifier diode is used as a rectifying component, which is small in size and light in weight, and is convenient for secondary integration packaging.
  • the sampling unit is composed of a resistor network.
  • the resistor network is ideal for collecting DC parameters, making it easy to set the action point at which the constant current unit is turned off and on.
  • the invention has the beneficial effects that the LED module is directly driven by the alternating current power, the circuit is simple, the volume is small, the weight is light, and the cost is low.
  • the LED lighting device can periodically reduce the fluctuation of the AC power fluctuation, and when the instantaneous voltage of the alternating current is too high, the constant current unit is turned off, and the LED module does not emit light, thereby improving the utilization of the power supply. Efficiency, reducing power consumption.
  • the LED module is prevented from changing due to junction temperature. The description of the book is too large and burned, prolonging the life of the device.
  • the LED module is formed by the LED with the illuminating lifetime, and the LED illuminating afterglow can be used to further overcome the LED flicker caused by the alternating current, and the efficiency of the LED illuminating device is improved, and the service life of the LED is prolonged.
  • the LED illumination afterglow is combined with the circuit advantages, and the effect is obvious.
  • Figure 1 is a block diagram showing the structure of the present invention
  • FIG. 2 is a circuit schematic diagram of Embodiment 1;
  • Figure 3 is a schematic view of Embodiment 2;
  • Figure 4 is a schematic view of Embodiment 3.
  • Figure 5 shows the voltage and current waveforms.
  • the illuminating life controllable LED is an LED with an illuminating life of l ⁇ 100ms.
  • the luminescence lifetime is the time required for the luminescence intensity to drop to 1/e of the maximum intensity at the time of excitation.
  • the luminescent lifetime controllable LED of the present invention comprises a combination of one or more inorganic and/or organic luminescent materials.
  • the white LED lighting device of the alternating current direct current driving of the present invention has a block diagram as shown in FIG. 1 , including an alternating current input terminal 1 , a protection unit 2 , a rectifying unit 3 , and a first output terminal 31 of the rectifying unit 3 (usually a positive electrode) And a first branch, a second branch, ... the nth branch connected in parallel with the second output 32 (usually the negative pole).
  • the first routing first LED module 51 and the first constant current unit 61 are connected in series
  • the second routing second LED module 52 and the second constant current unit 62 are connected in series, ...
  • the nth LED module 5n and the nth constant current unit 6n are connected in series, and each constant current unit is connected to the sampling unit, where n ⁇ , and is an integer.
  • the AC input terminal 1 is used for connecting AC to provide operating current for the device;
  • the protection unit 2 is connected to the AC input terminal to provide protection for the device;
  • the rectification unit 3 is connected to the protection unit 2, and rectifies and outputs the AC power output from the protection unit 2 Sine wave pulse current (as shown in Figure 5a); used by sampling unit 4
  • the specification samples the output voltage of the rectifying unit, and outputs a control signal to each constant current unit; each constant current unit is connected to the sampling unit 4, and the current of the corresponding branch is constant and is turned on or off according to the control signal output by the sampling unit 4. Break the corresponding branch.
  • the AC mains enters the protection unit 2 through the AC input interface 1 and is rectified by the rectification unit 3 to become a sinusoidal pulse voltage.
  • the voltage waveform is shown in Figure 5a.
  • T In an alternating current period T, as the input voltage rises, the first LED module 51 is turned on, the first LED module 51 enters the working state, and the current gradually increases, after reaching the preset current of the first constant current unit 61.
  • the preset current operates in a constant current state. As the voltage continues to rise, the voltage reaches the preset turn-off voltage of the first constant current unit 61, the first constant current unit 61 is turned off, and the first LED module 51 does not emit light.
  • the second constant current unit 62 is turned on, the second LED module 52 starts to work, and the second LED module 52 enters the constant current state, and the current set by the second constant current unit 62 maintains the constant current working state.
  • the voltage continues to rise, the second constant current unit 62 is turned off, and so on, until the nth LED module 5n starts operating, and the front constant current cells are all turned off. If the constant current of the first constant current unit 61 is set to I, the constant current of the second constant current unit 62 is 21, ... the constant current of the ⁇ constant current unit is nl.
  • the protection unit 2 of this example is composed of a fuse F and a varistor VR.
  • the fuse F is connected in series on the phase line L of the AC input terminal 1
  • the varistor VR is connected in parallel to the phase line L of the AC input terminal 1 and Between the zero line N.
  • the protection unit 2 is connected to the rectifying unit 3 constituted by the full-wave rectifying circuit D1, and the output ends of the rectifying unit 3 are connected in parallel with four branches.
  • the first routing first LED module and the first constant current unit are connected in series, the first LED module is composed of one LED11, the positive end thereof is connected to the positive pole of the rectifier circuit D1, and the negative terminal is connected to the rectifier circuit through the first constant current unit. D1 negative electrode.
  • the sampling in this example consists of a resistor network, including resistors R1 to R8.
  • the resistor R1 and the resistor R2 are connected in series and then connected in parallel between the positive pole and the negative pole of the rectifier circuit D1.
  • the connection point of the resistor R1 and the resistor R2 is a sampling point of the first constant current unit, and is connected to the control end of the first constant current unit.
  • the second LED module consists of a 2 X 2 array of 4 LEDs, including LED21, LED22, LED31 and LED32, which are connected in parallel with two LEDs and two parallel poles in parallel. Way to connect, as shown in Figure 2.
  • the positive terminal of the second LED module is connected to the positive pole of the rectifier circuit D1, and the negative terminal is connected to the cathode of the rectifier circuit D1 through the second constant current unit.
  • the resistor R3 is connected in series with the resistor R4 in parallel between the positive pole and the negative pole of the rectifier circuit D1, and the connection point of the resistor R3 and the resistor R4 is a sampling point of the second constant current unit, and is connected to the control end of the second constant current unit.
  • the third LED module in the third branch of this example consists of a 3 X 3 array of 9 LEDs, including LED41, LED42, LED43; LED5 U LED52, LED53; LED61, LED62, LED63. These LEDs are connected in parallel with three sets of the same poles in the same direction, see Figure 2.
  • the positive terminal of the third LED module is connected to the positive pole of the rectifier circuit D1, and the negative terminal is connected to the negative pole of the rectifier circuit D1 through the third constant current unit.
  • Resistor R5 and The resistor R6 is connected in series and connected in parallel between the positive and negative terminals of the rectifier circuit D1.
  • the connection point of the resistor R5 and the resistor R6 is the sampling point of the third constant current unit, and is connected to the control terminal of the third constant current unit.
  • the fourth LED module consists of a 4 X 4 array of 16 LEDs, including LED71, LED72, LED73, LED74; LED8 U LED82, LED83, LED84; rectifier circuit D1 negative LED9U LED92, LED93, LED94; LEDOU LED02, LED03, LED04. These LEDs are connected in parallel with four groups of same poles in the same direction, see Figure 2.
  • the positive terminal of the fourth LED module is connected to the positive pole of the rectifier circuit D1, and the negative terminal is connected to the fourth constant current unit.
  • the resistor R7 is connected in series with the resistor R8 in parallel between the positive pole and the negative pole of the rectifier circuit D1, and the connection point of the resistor R7 and the resistor R8 is a sampling point of the fourth constant current unit, and is connected to the control terminal of the fourth constant current unit.
  • the negative electrode of the rectifier circuit D1 is a common ground terminal.
  • the plug is connected to the power grid.
  • the illuminating device obtains AC power, and the AC power passes through the protection unit, and is rectified by the rectifying unit into DC power (strictly speaking, sinusoidal pulse DC power, the waveform is as shown in FIG. 5a) is supplied to the voltage sampling unit, and is constant. Flow unit and LED module.
  • DC power sinusoidal pulse DC power, the waveform is as shown in FIG. 5a
  • Flow unit and LED module In each AC cycle T, the output voltage of the rectifier circuit D1 rises from zero.
  • the first constant current unit is turned on, and the first LED module starts to emit light.
  • the voltage continues to rise, and the constant current unit 1 operates at a set constant current of 20 mA, so that the current of the first LED module reaches a rated current of 20 mA.
  • the first constant current unit is turned off, the first LED module stops working, the first LED module is turned off, and the second LED module starts to emit light, and enters a working state.
  • the voltage is raised, and the second constant current unit operates at a set constant current of 40 mA to bring the current of the second LED module to a rated current of 40 mA.
  • the second constant current unit When the voltage rises to the second constant current unit for a predetermined off voltage, the second constant current unit is turned off, the second LED module stops working, and the third LED module starts to work, and as the voltage rises,
  • the third constant current unit operates at a set constant current of 60 mA to bring the current of the third LED module to a rated current of 60 mA.
  • the third constant current unit When the voltage rises to the preset turn-off voltage, the third constant current unit is turned off, the fourth constant current unit is turned on, the fourth LED module starts to work, and when the voltage continues to rise, the fourth constant current unit has a constant current. 80mA operation, so that the fourth LED module current reaches 80mA rated current.
  • the current waveform is a schematic diagram of the current example.
  • the illuminating device of this example has high efficiency and power factor.
  • the fourth constant current unit also has a protection function, and when the voltage exceeds the preset off voltage, the fourth constant current unit is turned off.
  • the LED modules in the entire illuminating device are all turned off to protect the illuminating device from damage.
  • the LED array in each LED module (the LED module of the first branch in this example can also be regarded as a 1 X 1 LED array), which may be composed of LEDs arranged on the same printed circuit board, or They are integrated and packaged on the same heat-dissipating substrate by integrated packaging technology, and they can also be integrated on the same semiconductor substrate by using an integrated circuit process.
  • FIG. 3 is a schematic diagram of the circuit of the present example. It can be seen that the structure of the LED module is the same as that of the first embodiment except that the structure of the LED module and the connection manner thereof are different from that of the first embodiment. In the following, only the structure of the LED module of the four branches is described. For other structures and their working processes, please refer to the description of Embodiment 1, which will not be described here.
  • the first LED module in the first branch of this example consists of The description is composed of one LED31, the positive end of the first LED module is connected with the positive pole of the rectifier circuit D1, and the negative end of the first LED module is connected to the negative pole of the rectifier circuit D1 through the first constant current unit.
  • the second LED module in the second branch of this example includes LED31, LED32, and LED2U LED22 totaling 4 LEDs.
  • the four LEDs form an array of 2 X 2 , wherein the LED 31 and the LED 32 are connected in series in the same direction, and the LED 21 and the LED 22 are connected in series in the same direction.
  • the second LED module has a positive terminal connected to the positive terminal of the rectifier circuit D1, and a negative terminal connected to the negative terminal of the rectifier circuit D1 through the second constant current unit.
  • the third LED module of this example includes LED31, LED32, LED33, LED2K LED22, LED23, LED11, LED12, LED 13 and a total of 9 LEDs.
  • the 9 LEDs form an array of 3 X 3 , wherein LED31, LED32, and LED33 are connected in series in the same direction, and LED21, LED22, and LED23 are connected in series in the same direction. Group, LED11, LED12, LED13 are connected in series in the same direction.
  • These three sets of the same pole form a third LED module.
  • the positive terminal of the third LED module is connected to the positive pole of the rectifier circuit D1, and the negative terminal is connected to the cathode of the rectifier circuit D1 through the third constant current unit.
  • the first constant current unit, the second constant current unit, and the third constant current unit are all turned off in FIG.
  • each branch circuit is multiplied as in the first embodiment. If the first branch current is I, the other branches are 21, 31, and 41 in sequence.
  • the LEDs in each LED module are connected in series and in parallel, and some LEDs belong to multiple LED modules at the same time.
  • LED 31 belongs to all LED modules at the same time.
  • LED22 and LED32 belong to the second, third and fourth LED modules at the same time, and LED33, LED23 and LED13 are the third and fourth LED modules at the same time.
  • the circuit diagram of this example is further optimized according to the second embodiment, and the LED module connection manner is further optimized.
  • Four of the four branches are composed of 16 LEDs, and 4 X 4 is used.
  • Matrix topology The first LED module of this example consists of a 1 X 4 array of LED01, LED1 U LED21 and LED31 with 4 LEDs connected in parallel.
  • the second LED module of this example consists of a 2 ⁇ 4 array of LED01, LED1, LED2U, LED31, LED02, LED12, LED22, and LED32, which are composed of 8 LEDs connected in series and in parallel.
  • the third LED module of this example consists of a 3 X 4 array consisting of LED01, LED1 K LED2K LED31, LED02, LED12, LED22, LED32, LED03, LED13, LED23 LED33 with 12 LEDs connected in series and in parallel.
  • the group consists of a 4 X 4 array consisting of LED01, LED11, LED2 U LED31, LED02, LED12, LED22, LED32, LED03, LED13, LED23, LED33, LED04, LED14, LED24, LED34 with 16 LEDs connected in series and in parallel. See the above embodiment for the connection relationship and working principle.
  • the biggest characteristic of this circuit is that the currents of the branches are the same, that is, the currents set by all the constant current units are the same, which is four times of the constant current driving current of one LED.
  • the voltage sampling unit of the present invention monitors the input voltage while also having the pair of LEDs.
  • the protection function of the manual module When the AC voltage fluctuates greatly, the constant current unit can also be disconnected in time to protect the LED module from damage due to excessive current.
  • the constant current unit of the present invention may be constructed using separate components and/or integrated circuits, and is required to have a switch control function (capable of turning off and on control). Since the specific circuit is well-known in the art, the present invention will not be described in detail.

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Abstract

本发明涉及LED发光装置的交流电直接驱动技术。本发明针对现有技术交流电直接驱动的LED发光装置的问题，公开了一种交流电直接恒流驱动的白光LED发光装置。本发明的技术方案中，n条LED模组及其串联的恒流单元构成的并联支路连接在整流电路输出端，通过设定个支路恒流单元的电流值及其关断、接通电压，可以避免交流电压变化产生的周期性闪烁现象。由于每条支路的电流是恒定的，LED不会因为结温的变化而引起电流的变化，提高了可靠性。支路数量的增加可以使驱动电流波形接近正弦波，提高发光装置的功率因数和效率。特别是采用发光寿命可控LED构成LED模组，能够利用LED发光余辉进一步克服交流电引起的LED闪烁现象。

Description

说 明 书 交流电直接恒流驱动的白光 LED发光装置 技术领域
本发明涉及 LED (发光二极管） 发光装置， 特别涉及 LED发光装置的交流电直接恒流驱 动技术。
背景技术
LED作为一种新型固态光源， 以其节能、 环保、 寿命长等优点有望成为新一代照明光源。 众所周知， 现有 LED几乎都是用直流电驱动的， 而我们的生产生活用电却是交流电。 因此， 在目前使用的 LED产品中， 需要一个电源转换器， 将交流电转换为直流电。 电源转换器的引 入， 带来很多负面效应。 其一， 电源转换器的寿命远远低于 LED自身的寿命， 使得照明装置 的使用寿命变短； 其二， 电源转换器会降低发光装置的效率； 其三， 在小功率应用中， 电源 转换器会引起功率因数的下降和电流总谐波失真的增加。 为了充分发挥半导体照明的优势， 可以用交流电直接驱动的 LED发光装置成为当前的研究热点。
在已有的交流 LED公开技术中， 大多是使用多颗 LED组件按照反向并联或者桥式整流的 电路拓扑结构连接而成， 以满足交流电力的驱动要求。 但是， 交流电是按照一定的频率周期 性波动的， 由于 LED 自身开启电压的存在， 在瞬时电压超过开启电压时， LED才会导通并发 光。 反之， LED是截止不发光的。 这种电路使得 LED的发光效率很低， 并且随着交流电压波 动出现发光闪烁现象。
国际专利 WO 2004/023568A1 "LIGHT-EMITTING DEVICE HAVING LIGHT-EMITTING ELEMENTS" 中， 提出了在蓝宝石衬底上集成 LED芯片阵列， 从而提供一种交流电力驱动的发 光装置， 但没有解决 LED的发光闪烁问题。
美国专利 US 7, 489, 086 B2 "AC LIGHT EITTING DIODE AND AC LED DRIVE METHODS AND APPARATUS"提供了一种交流 LED器件，该发明是一种将多个 LED集成封装的器件，利用人眼 的视觉暂留效应来弥补交流电引起的 LED发光闪烁现象。 该专利没有从根本上解决交流电压 周期性波动造成的发光闪烁现象。
可见， 在已公开 LED交流驱动技术中， 都存在一个缺点： LED的驱动电流会随着交流电 压的波动而波动， 导致 LED发光时出现亮度变化， 产生发光闪烁的现象。 同时， LED器件的 核心是一个 PN结二极管，其 I-V特性为近似的指数函数，当 LED两端的电压大于开启电压后， 流过 PN结的电流呈指数增长。现有技术的交流驱动方法， 由于没有使用恒流电路， 在 LED结 温升高时， 其开启电压会下降， 由于输入电压不变， 使得 LED的正向电流急剧增加， 严重时 会使 LED的 PN结造成热击穿， 永久损坏。 说 明 书 发明内容
本发明所要解决的技术问题， 就是针对现有技术交流电直接驱动 LED发光装置的问题， 提供一种交流电直接恒流驱动的白光 LED发光装置。
本发明解决所述技术问题， 采用的技术方案是， 交流电直接恒流驱动的白光 LED发光装 置， 包括交流输入端、 保护单元和整流单元， 其特征在于， 所述整流单元的第一输出端和第 二输出端之间并联有第一支路、 第二支路、 ……第 n支路， 所述第一支路由第一 LED模组和 第一恒流单元串联构成， 所述第二支路由第二 LED模组和第二恒流单元串联构成， ……所述 第 n支路由第 n LED模组和第 n恒流单元串联构成， 每个恒流单元都与采样单元连接， 其中 n^ l , 且为整数；
所述交流输入端用于连接交流电， 为装置提供工作电流；
所述保护单元与交流输入端连接， 为装置提供保护功能；
所述整流单元与保护单元连接， 对保护单元输出的交流电进行整流；
所述采样单元用于对整流单元的输出电压进行采样， 并输出控制信号到各个恒流单元； 各个恒流单元与采样单元连接， 恒定相应支路的电流并根据采样单元输出的控制信号接 通或关断相应支路；
所述 LED模组由 LED阵列组成， 所述 LED阵列中的 LED为发光寿命可控的 LED。
本发明的发光装置技术方案中， n条 LED模组及其串联的恒流单元构成的并联支路连接 在整流电路输出端， 通过设定个支路恒流单元的电流值及其关断、 接通电压， 可以避免交流 电压变化产生的周期性闪烁现象。 由于每条支路的电流时是恒定的， LED模组中的 LED不会 因为结温的变化而引起电流的变化， 提高了 LED的可靠性。 通过理论分析可以知道， 支路数 量的增加可以使驱动电流波形接近正弦波， 提高发光装置的功率因数和效率。 特别是采用发 光寿命可控 LED构成 LED模组， 能够利用 LED发光余辉进一步克服交流电引起的 LED闪烁现 象， 并提高 LED发光装置的效率， 延长 LED的使用寿命。
具体的， 所述发光寿命可控的 LED发光寿命为 l〜100ms。
LED发光寿命的延长， 有利于克服闪烁现象。
更进一歩的， 所述发光寿命为 10〜30ms。
该范围的发光寿命时间与交流电周期（l/50s或 l/60s )匹配， 可以恰到好处地发挥其余 辉优势， 并且技术上更容易实现， 成本也更低。
进一步的， 所述 LED阵列由布置在同一印制电路板上的至少 1个 LED构成， 或者集成封 装在同一基板上的至少 1个 LED构成， 或者集成在同一半导体衬底上的至少 1个 LED构成。
将 LED模组中所有的 LED布置在同一印制电路板上， 是目前工艺条件下最简单、 经济的 说 明 书
封装方法； 将 LED模组中所有的 LED集成封装在同一基板上， 是指将 LED模组中所有的 LED 进行二次封装，集成在同一散热基板上；将 LED模组中所有的 LED集成在同一半导体衬底上， 这是采用半导体集成电路工艺， 在同一半导体基片上实现 LED的集成。 这些技术都是当前比 较成熟的 LED集成封装技术。
具体的， 各个 LED模组中 LED并联和 /或串联连接。
LED模组中 LED适当的连接组合， 如并联、 串联或混联等， 更能够适应交流电直接驱动 的使用环境， 方便地调整各个 LED模组的电流、 电压参数。
进一歩的， 第一 LED模组、 第二 LED模组、 ……第 n LED模组中包含的 LED数量分别为 I2、 22 、 …… n2， 相应的恒流单元电流分别为 I、 21、 …… nl ; I为第一恒流单元电流。
LED模组中 LED数量的这种分布规律， 可以实现个支路电流的倍数关系， 使总电流波形 接近正弦波， 有利于提高发光装置的功率因数和效率。
更进一步的， 当 ηϊ^时， 同一 LED同时属于不同的 LED模组。
该方案可以将各个 LED模组中的 LED交错布置,使同一只或几只 LED同时属于不同的 LED 模组， 实现 LED的复用， 可以减少发光装置的 LED数量， 提高发光装置发光亮度的均勾性， 有利于克服闪烁现象。
具体的， 所述保护单元包括保险丝和 /或压敏电阻， 所述保险丝串联在交流输入端， 所述 压敏电阻并联在交流输入端。
保险丝是常用的限流保护元件， 压敏电阻则是常用的限压保护元件， 他们的组合可以完 成最基本的限流和限压保护， 并且成本低， 安装方便， 便于进行二次集成。
进一步的，所述保护单元还包括共模扼流圈和 /或气体放电管，所述共模扼流圈串联在交 流输入端， 所述气体放电管并联在交流输入端。
增加共模扼流圈和气体放电管， 共模扼流圈可以抑制共模干扰， 气体放电管可以保护照 明装置不被雷电等伤害。
具体的， 所述整流单元由整流二极管组成的全波整流电路或半波整流电路构成。
釆用整流二极管作为整流元件， 体积小重量轻， 便于进行二次集成封装。
具体的， 所述采样单元由电阻网络构成。
电阻网络非常适合采集直流参数， 便于设定恒流单元断开和接通的动作点。
本发明的有益效果是， 使用交流电力直接恒流驱动 LED模组， 电路简单， 体积小、 重量 轻， 成本低。 通过适当预置各支路电流和开关电压， 可以减轻交流电波动时 LED发光装置周 期性闪烁， 并且在交流电瞬时电压过高时， 恒流单元关断， LED模组不发光， 提高了电源的 利用效率， 降低了电力损耗。 同时， 由于采用恒流控制， 避免了 LED模组因结温变化， 电流 说 明 书 过大而烧毁的情况， 延长了装置的使用寿命。 采用发光寿命可控 LED构成 LED模组， 能够利 用 LED发光余辉进一步克服交流电引起的 LED闪烁现象， 并提高 LED发光装置的效率， 延长 LED的使用寿命。 本发明中， LED发光余辉与电路优势结合， 效果明显。
附图说明
图 1是本发明的结构框图；
图 2是实施例 1的电路原理图；
图 3是实施例 2的示意图；
图 4是实施例 3的示意图；
图 5为电压和电流波形。
具体实施方式
下面结合附图及实施例， 详细描述本发明的技术方案。
发光寿命可控 LED, 是指发光寿命为 l〜100ms的 LED。 根据发光学定义， 发光寿命为发 光强度降到激发时最大强度的 1/e所需的时间。
本发明中发光寿命可控 LED,含有一种或多种无机和 /或有机发光材料的组合。比如： CaS: Eu; CaS:Bi,Tm; ZnS:Tb; CaSrS2 : Eu， Dy; SrG¾S4:Dy; Ga203:Eu; (Y, Gd)B03:Eu3+； Zn2Si04:Mn2+； YB03:Tb3+; Y(V, P) 04:Eu3+; SrAl204:Eu2+; SrAl204:Eu2+， B; SrAl204:Eu2+, Dy3+, B; BaAl204:Eu2+; CaAl204:Eu2+ ； Sr3Si05:Eu2+, Dy3+ ； BaMgAl10017:Eu2+, Mn2+ ； Tb(acac)2(AA)phen ； Y202S:Eu3+ , Y2Si05:Tb3+； SrG¾S4:Ce3+; Y3(A1, Ga)6012:Tb3+； C¾ Zn4 Ti15036 : Pr3+; CaTi03:Pr3+; Zn2P207： Tm3+ ; Ca2P207： Eu2+， Y3+; Sr2P207： Eu2+， Y3+； Lu203： Tb， SrM u： Eu2+; Mg2Sn04： Mn2+; CaAl204： Ce3+ Tb3+ ； Sr4Al14025:Tb3+ ； Ca10(P04)6(F, CI)： Sb,Mn ； Sr2MgSi207:Eu2+ ； Sr2CaSi207:Eu2+ ； Zn3(P04)2:Mn2+,Ga3+； CaO:Eu3+； Y202S :Mg2+， Ti3+ ; Y202S:Sm3+； SrMg2(P04)2 ： Eu2+，Gd3+ ; BaMg2 (P04)2 ： Eu2+，Gd3+; Zn2Si04:Mn， As; KLaF4:Er; CdSi03: Dy3+ ; MgSi03: Eu2+, Mn2+中的一 种或多种。
本发明的交流电直接恒流驱动的白光 LED发光装置， 结构框图如图 1所示， 包括交流输 入端 1、 保护单元 2、 整流单元 3， 以及整流单元 3的第一输出端 31 (通常为正极）和第二输 出端 32 (通常为负极）之间并联的第一支路、第二支路、……第 n支路。第一支路由第一 LED 模组 51和第一恒流单元 61串联构成， 所述第二支路由第二 LED模组 52和第二恒流单元 62 串联构成， ……所述第 n支路由第 n LED模组 5η和第 η恒流单元 6η串联构成， 每个恒流单 元都与采样单元连接， 其中 ηΞϊΙ, 且为整数。 交流输入端 1用于连接交流， 为装置提供工作 电流； 保护单元 2与交流输入端连接， 为装置提供保护功能； 整流单元 3与保护单元 2连接， 对保护单元 2输出的交流电进行整流， 输出正弦波脉冲电流 （如图 5a所示）； 采样单元 4用 说 明 书 于对整流单元的输出电压进行采样， 并输出控制信号到各个恒流单元； 各个恒流单元与采样 单元 4连接， 恒定相应支路的电流并根据采样单元 4输出的控制信号接通或关断相应支路。
下面简单描述本发明的工作原理：
交流市电 （通常为正弦波交流电）通过交流输入接口 1进入保护单元 2， 经整流单元 3 进行整流， 成为正弦波脉冲电压， 其电压波形如图 5a所示。 在一个交流电周期 T内， 随输入 电压升高， 达到第一 LED模组 51开启电压， 第一 LED模组 51进入工作状态， 电流逐渐增大， 达到第一恒流单元 61预设电流之后以该预设电流工作在恒流状态。随电压继续升高， 电压到 达到第一恒流单元 61预设关断电压， 第一恒流单元 61关断， 第一 LED模组 51不发光。此时 第二恒流单元 62接通，第二 LED模组 52开始工作，第二 LED模组 52进入恒流状态后以第二 恒流单元 62设定的电流维持恒流工作状态， 随着电压继续上升， 第二恒流单元 62关断， 以 此类推， 直到第 nLED模组 5η开始工作， 前面的恒流单元全部关断。 如果设定第一恒流单元 61恒流电流为 I， 第二恒流单元 62恒流电流为 21， ……第 η恒流单元恒流电流为 nl， 理论 上， 分组越多， 电流波形越接近正弦波， 如图 5b所示， 功率因数也越高， 效率也越高， 但是 电路也越复杂， 布局布线也越困难。 因此， 在实际应用中， 选取有限个恒流单元与对应数量 的 LED模组构成有限条支路。
实施例 1
如图 2所示，本例保护单元 2由保险丝 F和压敏电阻 VR构成，保险丝 F串联在交流输入 端 1的相线 L上，压敏电阻 VR并联在交流输入端 1的相线 L和零线 N之间。保护单元 2与全 波整流电路 D1构成的整流单元 3连接， 整流单元 3输出端并联 4条支路。
第一支路由第一 LED模组和第一恒流单元串联构成， 第一 LED模组由一只 LED11构成， 其正端连接整流电路 D1正极， 负端通过第一恒流单元连接到整流电路 D1负极。 本例采样由 电阻网络构成， 包括电阻 R1〜R8。 电阻 R1与电阻 R2串联后并联在整流电路 D1正极和负极 之间， 电阻 R1和电阻 R2的连接点为第一恒流单元的采样点， 并与第一恒流单元控制端连接。 本例第二支路中， 第二 LED模组由 4只 LED构成的 2 X 2的阵列组成， 包括 LED21、 LED22. LED31和 LED32 , 他们以两只 LED同向串联后两组同极并联的方式连接， 如图 2所示。 第二 LED模组正端连接整流电路 D1正极， 负端通过第二恒流单元连接到整流电路 D1负极。 电阻 R3与电阻 R4串联后并联在整流电路 D1正极和负极之间， 电阻 R3和电阻 R4的连接点为第二 恒流单元的采样点， 并与第二恒流单元控制端连接。 本例第三支路中的第三 LED模组由 9只 LED构成的 3 X 3的阵列组成， 包括 LED41、 LED42、 LED43; LED5 U LED52、 LED53; LED61、 LED62、 LED63。 这些 LED 以三只同向串联后三组同极并联的方式连接， 参见图 2。 第三 LED 模组正端连接整流电路 D1正极， 负端通过第三恒流单元连接到整流电路 D1负极。 电阻 R5与 说 明 书 电阻 R6串联后并联在整流电路 D1正极和负极之间， 电阻 R5和电阻 R6的连接点为第三恒流 单元的采样点， 并与第三恒流单元控制端连接。 本例第四支路中， 第四 LED模组由 16只 LED 构成的 4 X 4的阵列组成， 包括 LED71、 LED72、 LED73, LED74; LED8 U LED82、 LED83、 LED84; 整流电路 D1 负极 LED9U LED92、 LED93、 LED94; LEDOU LED02、 LED03、 LED04。 这些 LED 以四只同向串联后四组同极并联的方式连接， 参见图 2。 第四 LED模组正端连接整流电路 D1 正极， 负端通过第四恒流单元连接到。 电阻 R7与电阻 R8串联后并联在整流电路 D1正极和负 极之间， 电阻 R7和电阻 R8的连接点为第四恒流单元的采样点， 并与第四恒流单元控制端连 接。 本例整流电路 D1负极为公共地端。
通过插头与电网连接， 本例发光装置获得交流电力， 交流电经过保护单元， 并由整流单 元整流成直流电 （严格的说是正弦波脉冲直流电， 波形如图 5a所示）提供给电压采样单元、 恒流单元和 LED模组。在每个交流周期 T中， 整流电路 D1输出电压从零开始上升， 当电压升 高达到第一 LED模组的开启电压时， 第一恒流单元接通， 第一 LED模组开始发光， 进入工作 状态。 电压继续升高， 恒流单元 1 以设定的恒定电流 20mA工作， 使第一 LED模组电流达到 20mA额定电流。 当电压升高达到预设关断电压时， 第一恒流单元关断， 第一 LED模组停止工 作， 第一 LED模组熄灭， 第二 LED模组开始发光， 进入工作状态。 电压进行升高， 第二恒流 单元以设定的恒定电流 40mA工作， 使第二 LED模组电流达到 40mA额定电流。 当电压升高到 第二恒流单元达预设的关断电压时， 第二恒流单元关断， 第二 LED模组停止工作， 第三 LED 模组开始工作， 随着电压进行升高， 第三恒流单元以设定的恒定电流 60mA工作， 使第三 LED 模组电流达到 60mA额定电流。 当电压升高达到预设关断电压时， 第三恒流单元关断， 第四恒 流单元接通，第四 LED模组开始工作，当电压继续升高，第四恒流单元以恒定电流 80mA工作， 使第四 LED模组电流达到 80mA额定电流。 如图 5b所示为本例的电流波形示意图， 由图可见 电流在不同的阶段成倍增加，其波形趋近正弦。使本例发光装置具有很高的效率和功率因数。 第四恒流单元也有保护功能， 当电压超过预设关断电压时， 第四恒流单元关断。 整个发光装 置中的 LED模组全部关断， 保护发光装置不至于损坏。
本例中各个 LED模组中的 LED阵列（本例第一支路的 LED模组也可以看成是 1 X 1的 LED 阵列）， 可以是布置在同一印制电路板上的 LED构成， 或者采用集成封装技术， 将他们集成封 装在同一散热基板上构成， 也可以利用集成电路工艺，将他们集成在同一半导体衬底上构成。
实施例 2
图 3所示为本例电路示意图， 可以看出， 本例除了 LED模组结构及其连接方式与实施例 1不同外， 其他结构与实施例 1相同。 下面仅就四条支路的 LED模组结构进行描述， 其他结 构及其工作过程请参见实施例 1 的描述， 此处恕不赘述。 本例第一支路中的第一 LED模组由 说 明 书 一只 LED31组成，第一 LED模组正端与整流电路 D1正极连接，第一 LED模组负端通过第一恒 流单元连接到整流电路 D1负极。本例第二支路中的第二 LED模组包括 LED31、 LED32, LED2U LED22共 4只 LED。 当第一恒流单元关断时， 这 4只 LED构成 2 X 2的阵列， 其中 LED31 与 LED32同向串联为一组， LED21与 LED22同向串联为一组，这两组同极并联构成第二 LED模组， 该第二 LED模组正端与整流电路 D1正极连接， 负端通过第二恒流单元连接到整流电路 D1负 极。 本例第三 LED模组包括 LED31、 LED32、 LED33 , LED2K LED22、 LED23 , LED11、 LED12、 LED 13共 9只 LED。当第一恒流单元和第二恒流单元都关断时， 这 9只 LED构成 3 X 3的阵列， 其中 LED31、 LED32、 LED33同向串联为一组， LED21、 LED22、 LED23同向串联一组， LED11、 LED12, LED13同向串联为一组， 这三组同极本例构成第三 LED模组。 该第三 LED模组正端与 整流电路 D1正极连接， 负端通过第三恒流单元连接到整流电路 D1负极。 同样的， 当图 3中 第一恒流单元、第二恒流单元和第三恒流单元都关断时，四组同向串联的 LED31、LED32、LED33、 LED34, LED2 K LED22, LED23、 LED24, LED11、 LED12, LED13、 LED14, LEDOU LED02、 LED03, LED04构成的 4 X 4的 LED阵列组成本例的第四 LED模组，该第四 LED模组正端与整流电路 D1 正极连接， 负端通过第四恒流单元连接到整流电路 D1负极。 本例中， 各支路电路与实施例 1 一样， 也是成倍数关系， 如果第一支路电流为 I， 其他支路依次为 21、 31和 41。
本例各个 LED模组中的 LED釆用了串联和并联结合的方式， 并且部分 LED同时属于多个 LED模组。 如图 3中， LED31同时属于所有 LED模组， LED22和 LED32同时属于第二、 第三和 第四 LED模组， LED33、 LED23和 LED13同时第三和第四 LED模组。 采用这种复用结构， 大大 的减少了发光单元的数量， 降低了发光装置成本， 并且有利于克服闪烁现象。
实施例 3
如图 4所示， 本例电路示意图与实施例 2相比， 各个 LED模组连接方式做了进一步的优 化， 四条支路中的四个 LED模组由 16只 LED组成，采用 4 X 4的矩阵拓扑结构。本例第一 LED 模组由 LED01、 LED1 U LED21和 LED31共 4只并联的 LED构成的 1 X 4阵列组成。 本例第二 LED模组由 LED01、 LED1 LED2U LED31 , LED02、 LED12、 LED22、 LED32共 8只串联并联结 合的 LED构成的 2 X 4阵列组成。本例第三 LED模组由 LED01、 LED1 K LED2K LED31 , LED02、 LED12、 LED22、 LED32 , LED03、 LED13、 LED23 LED33共 12只 LED串联并联结合构成的 3 X 4 阵列组成，本例第四 LED模组由 LED01、 LED11、 LED2 U LED31 , LED02、 LED12、 LED22、 LED32, LED03、 LED13、 LED23、 LED33 , LED04、 LED14、 LED24、 LED34共 16只 LED串联并联结合构 成的 4 X 4阵列组成，其他部分的连接关系以及工作原理参见上述实施例。本例电路最大特点 是各支路电流相同， 即所有恒流单元设定的电流相同， 均为一只 LED恒流驱动电流的 4倍。
经上述详细的阐释，可以看出，本发明的电压采样单元监测输入电压， 同时还具有对 LED 说 明 书 模组的保护功能。 当交流电压出现大的波动的时候， 恒流单元也能及时断开， 保护 LED模组 不因电流过大而损坏。本发明的恒流单元可以采用分离元件和 /或集成电路构成， 要求具有开 关控制功能（能进行关断和接通控制）， 由于具体电路属于本领域成熟技术， 本发明不作详细 描述。
需要说明的是， 虽然上述实施例已经详细描述了本发明的结构， 但本发明并不限于上述 实施例， 凡是本领域技术人员从上述实施例中不经过创造性劳动就可以想到的替换结构， 均 属于本发明的保护范围。

Claims

权 利 要 求 书
1、 交流电直接恒流驱动的白光 LED发光装置， 包括交流输入端、 保护单元和整流单元， 其特征在于，所述整流单元的第一输出端和第二输出端之间并联有第一支路、第二支路、…… 第 n支路，所述第一支路由第一 LED模组和第一恒流单元串联构成，所述第二支路由第二 LED 模组和第二恒流单元串联构成， ……所述第 n支路由第 n LED模组和第 n恒流单元串联构成， 每个恒流单元都与采样单元连接， 其中 n l， 且为整数；
所述交流输入端用于连接交流电， 为装置提供工作电流；
所述保护单元与交流输入端连接， 为装置提供保护功能；
所述整流单元与保护单元连接， 对保护单元输出的交流电进行整流；
所述采样单元用于对整流单元的输出电压进行采样， 并输出控制信号到各个恒流单元； 各个恒流单元与采样单元连接， 恒定相应支路的电流并根据采样单元输出的控制信号接 通或关断相应支路；
所述 LED模组由 LED阵列组成， 所述 LED阵列中的 LED为发光寿命可控的 LED。
2、根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所述 发光寿命可控的 LED发光寿命为 l〜100ms。
3、根据权利要求 2所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所述 发光寿命为 10〜30ms。
4、根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所述 LED阵列由布置在同一印制电路板上的至少 1个 LED构成， 或者集成封装在同一基板上的至 少 1个 LED构成， 或者集成在同一半导体衬底上的至少 1个 LED构成。
5、根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 各个 LED模组中 LED并联和 /或串联连接。
6、根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 第一 LED模组、 第二 LED模组、 ……第 n LED模组中包含的 LED数量分别为 I2、 22 、 …… n2， 相 应的恒流单元电流分别为 I、 21、 …… nl ; I为第一恒流单元电流。
7、 根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 当 n ≡¾2时， 同一 LED同时属于不同的 LED模组。
8、根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所述 保护单元包括保险丝和 /或压敏电阻，所述保险丝串联在交流输入端，所述压敏电阻并联在交 流输入端。
9、根据权利要求 8所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所述 保护单元还包括共模扼流圈和 /或气体放电管，所述共模扼流圈串联在交流输入端，所述气体 权 利 要 求 书
放电管并联在交流输入端。
10、 根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所 述整流单元由整流二极管组成的全波整流电路或半波整流电路构成。
11、 根据权利要求 1所述的交流电直接恒流驱动的白光 LED发光装置， 其特征在于， 所 述采样单元由电阻网络构成。
PCT/CN2012/087390 2012-01-10 2012-12-25 交流电直接恒流驱动的白光led发光装置 WO2013104250A1 (zh)

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