WO2012100683A1 - 高功率因数恒流led照明电路 - Google Patents

高功率因数恒流led照明电路 Download PDF

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Publication number
WO2012100683A1
WO2012100683A1 PCT/CN2012/070299 CN2012070299W WO2012100683A1 WO 2012100683 A1 WO2012100683 A1 WO 2012100683A1 CN 2012070299 W CN2012070299 W CN 2012070299W WO 2012100683 A1 WO2012100683 A1 WO 2012100683A1
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Prior art keywords
constant current
circuit
power factor
high power
led lighting
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PCT/CN2012/070299
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English (en)
French (fr)
Inventor
吴俊纬
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广州南科集成电子有限公司
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Publication of WO2012100683A1 publication Critical patent/WO2012100683A1/zh

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    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter 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]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a high power factor constant current LED lighting circuit.
  • LEDs are used more and more widely, and LED lamps used for daily indoor and outdoor lighting are also
  • the simplest filter circuit generally includes at least one filter capacitor C2 and a bleeder resistor R2.
  • Complex filter circuits may Including more capacitor parts, due to the existence of capacitor parts, and the value of the filter capacitor is large, so that the reactive power of the circuit is relatively large, resulting in a low power factor of the entire circuit, even less than 0.5, which is not relevant in some countries.
  • Technical standards or specifications In order to improve the power factor, some LED lighting circuit components, and even IC modules, make the structure complex and costly.
  • MOSFET is the abbreviation of "metal-oxide-semiconductor field effect transistor", which means “metal oxide semiconductor field effect transistor”. Its principle is the basis of all modern integrated circuit chips.
  • a depletion MOSFET device consists of three basic components: source (S), gate (G), and drain (D).
  • An N-channel depletion MOS FET is adjacent to the gate surface between the source and the drain, and has a shallow doped layer of the same polarity as the source and drain to connect the source to the drain. When the gate and source voltages are positive, their saturation conduction current also increases with voltage increase, which is the same as the enhanced MOS FET.
  • the depletion tube when the gate and the source are at the same potential, when the drain is applied with a positive voltage, the depletion tube first passes through a linear region where the current rapidly rises, and then enters a saturation region where the constant current is turned on, and the drain voltage at this time is called As the saturation voltage, the magnitude of the drain-on current is related to the concentration and depth of the shallow doped layer. The larger the concentration and depth, the larger the current.
  • the gate voltage is defined as the turn-on voltage, but If the channel concentration is too thick and the depth is too deep, the gate will not be able to cut off the channel current.
  • the depletion mode MOS transistor has a constant current conduction when the gate and source voltages are zero, which makes it inferior to the enhanced MOS transistor in logic application, so it has not been isolated by the industry. Make the device to use. Since the depletion mode MOS transistor is turned on when the gate voltage is zero and its current is substantially in the saturation region until the drain avalanche breakdown when the drain voltage is increased, it can be used as a constant current source.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high power factor constant current LED lighting circuit with simple structure, few components and long LED service life.
  • the technical solution adopted by the present invention is:
  • the invention comprises a rectifying circuit, an LED light source load, and a constant current source circuit, wherein the high power factor constant current LED lighting circuit does not include a filter capacitor, and the alternating current is pulsated after being rectified by the rectifying circuit Direct current, pulsating direct current through the LED light source load, the constant current source circuit constitutes a loop, the constant current source circuit regulates and stabilizes the load of the LED light source, and the LED light source load includes at least one group connected in series a plurality of LEDs, the constant current source circuit comprising at least one set of constant current source devices, each set of the constant current source device comprising at least one depletion mode field effect transistor, the drain of the depletion mode field effect transistor being a In the contact, the source of the depletion field effect transistor is shorte
  • each of the sets of the constant current source devices includes two or more of the depletion type field effect transistors connected in parallel with each other.
  • Each set of the constant current source device includes at least two constant current source groups having the same current specification, each of the constant current source groups being connected in series with each other, and each of the constant current source groups is coupled with a first stable And a voltage diode, each of the constant current source groups including at least one of the depletion mode field effect transistors.
  • each of the constant current source groups includes two or more of the depletion type field effect transistors connected in parallel with each other.
  • the high power factor constant current LED lighting circuit further includes a fan circuit, the fan circuit and the The LED light source load, the constant current source circuit is connected in series and connected to the rectified pulsating direct current to form a loop.
  • the motor of the fan circuit is coupled to a second Zener diode or a shunt resistor.
  • the high power factor constant current LED lighting circuit further includes a short circuit protection circuit connected between the input end of the alternating current power source and the rectifier circuit.
  • the short circuit protection circuit includes a fuse.
  • the rectifier circuit uses bridge rectification.
  • the voltage of the alternating current input is a specific voltage range between 90 and 300 V, and the fluctuation range of the specific voltage section is ⁇ 30 V, and the number of LEDs connected in series in the LED light source load is 30 to 125.
  • the beneficial effects of the present invention are: Since the present invention does not include a filter capacitor, the alternating current is rectified by the rectifier circuit to become a pulsating direct current, and the pulsating direct current is charged by the LED light source, and the constant current source circuit forms a loop, the constant current The source circuit regulates and stabilizes the load of the LED light source, and the filter capacitor is removed to greatly reduce the reactive power of the circuit.
  • the power factor of the circuit of the invention is greater than 0.85, and can even be as high as 0.98 ⁇ 0.99; the pulsating direct current is within a certain range.
  • the constant current source device can block the fluctuation of the current, maintain a constant current, make the current through the LED light source load constant, and apply a fluctuating voltage to the constant current source device, thereby having a voltage regulation,
  • the function of steady current extends the service life of the LED light source load to avoid burning;
  • the constant current source device acts as a separate device, which is convenient for replacing the peripheral voltage regulation and current stabilization circuits of other existing circuits, so that the circuit components are greatly reduced.
  • the circuit is simple, so the invention has the advantages of simple structure, few components and long service life of the LED. LED lighting circuit constant power factor;
  • each set of the constant current source device includes at least two constant current source groups having the same current specification, each of the constant current source groups is connected in series with each other, and each of the constant current source groups is coupled with a first a Zener diode, each of the constant current source groups includes at least one of the depletion mode field effect transistors, and the constant current source group connected in series prevents the constant current source device from being safely used due to a DC voltage fluctuation Upper limit, further improving the withstand voltage capability, so that the current through the LED is more stable;
  • the Zener diode can make the constant current source group connected in series to work normally and stably, has a current shunting function, avoids current fluctuation caused by the characteristics of the constant current source group not completely consistent, and has a current balancing effect, so the present invention is resistant to The pressure effect is good, and the steady voltage effect is good;
  • each set of the constant current source device includes two or more depletion type field effect transistors connected in parallel with each other or each of the constant current source groups includes two or more connected in parallel with each other Depletion field effect transistor, for high power LED lighting circuit, by connecting at least two of the depletion field effect transistors in parallel, not only can the on current be improved, the current stabilization effect is good, and a single field effect transistor can be avoided.
  • the disadvantage of excessive heat generation is that the power is dispersed, the heat dissipation effect is good, and the temperature is too high, so the heat dissipation effect of the invention is good, and the voltage stabilization effect is good.
  • FIG. 1 is a schematic view of a conventional LED lighting circuit with a cooling fan
  • Embodiment 1 of the present invention is a schematic circuit diagram of Embodiment 1 of the present invention.
  • Embodiment 2 of the present invention is a schematic circuit diagram of Embodiment 2 of the present invention.
  • Embodiment 3 of the present invention is a schematic circuit diagram of Embodiment 3 of the present invention.
  • FIG. 5 is a schematic circuit diagram of Embodiment 4 of the present invention.
  • Embodiment 5 of the present invention is a schematic circuit diagram of Embodiment 5 of the present invention.
  • Embodiment 6 of the present invention is a schematic circuit diagram of Embodiment 6 of the present invention.
  • Embodiment 7 of the present invention is a schematic circuit diagram of Embodiment 7 of the present invention.
  • Embodiment 8 of the present invention is a schematic circuit diagram of Embodiment 8 of the present invention.
  • Figure 10 is a circuit diagram of Embodiment 9 of the present invention.
  • the high power factor constant current LED lighting circuit of the embodiment includes a rectifier circuit 1 LED light source load 2, constant current source circuit 3, short circuit protection circuit 5, the high power factor constant current LED lighting circuit does not include a filter capacitor, the rectifier circuit 1 uses bridge rectifier, that is, a rectifier bridge D, of course, other Rectified mode rectification, the voltage of the AC input is a specific voltage range between 90 ⁇ 300V applicable to the mains voltage of each country.
  • the fluctuation range of the specific voltage range is ⁇ 30V, which can ensure that the mains does not fluctuate within the range of ⁇ 30V.
  • the components in the circuit are burnt, and the alternating current is rectified by the rectifier circuit 1 to become a pulsating direct current, and the pulsating direct current is formed by the LED light source load 2 and the constant current source circuit 3, and the constant current source circuit 3 is paired.
  • the LED light source load 2 performs voltage regulation and steady current.
  • the LED light source load 2 includes a plurality of LEDs connected in series, that is, LED la ⁇ LED (n) a, and the number of LEDs connected in series is n.
  • Circuit 3 includes a set of constant current sources
  • the constant current source device includes a depletion field effect transistor Q11, a drain of the depletion field effect transistor Q1a is a junction, and a source and a gate of the depletion field effect transistor
  • the short circuit constitutes another contact
  • the short circuit protection circuit 5 is connected between the input end of the alternating current power source and the rectifier circuit 1
  • the short circuit protection circuit 5 includes a fuse FU.
  • the fuse tube FU is blown for protection, and other forms of protection circuits can of course be used.
  • Embodiment 2 As shown in FIG.
  • a group of the constant current source devices includes two depletion field effect transistors connected in parallel with each other,
  • the current stabilization effect is good, and the disadvantage of excessive heat generation caused by a single field effect transistor can be avoided.
  • the heat dissipation effect is good, and the temperature is too high.
  • Embodiment 3 As shown in FIG.
  • Embodiment 4 the difference between this embodiment and Embodiment 1 is: high power factor of this embodiment
  • the constant current LED lighting circuit further includes a fan circuit 4, the fan circuit 4 is connected in series with the LED light source load 2, the constant current source circuit 3, and connected to the rectified pulsating direct current to form a loop, and the fan circuit 4
  • the motor F is coupled to a second Zener diode Df, which functions to balance the fan motor current and overvoltage protection.
  • Embodiment 4 As shown in FIG.
  • the difference between this embodiment and the third embodiment is that: the load power of the embodiment is large, and the LED light source load 2 includes a plurality of sets of LEDs connected in series, g ⁇ LED la ⁇ LED (n) a, ⁇ , and LED lx ⁇ LED (n) x, the constant current source circuit 6 includes a plurality of sets of constant current source devices, each set of the constant current source device includes a consumption
  • the FETs Qla, ..., Qlx, each of the plurality of LEDs connected in series are connected in series with one of the depletion field effect transistors, and the groups after the series are connected in parallel, and the whole is connected in parallel
  • the fan circuit 4 is connected in series, and the motor F of the fan circuit 4 is coupled with a shunt resistor Rf, which functions to balance the fan motor current and the overcurrent protection.
  • a group of the constant current source devices includes two constant current source groups having the same current specification, and two The constant current source groups are connected in series with each other, and each of the constant current source groups is respectively coupled with a first Zener diode D1a, D2a, and each of the constant current source groups includes a depletion field effect transistor Qla, Q2a, a plurality of the constant current source groups connected in series can prevent the constant current source device from being in an upper limit of use safety due to fluctuations in direct current voltage, further improving the withstand voltage capability, so that the current through the LED is more stable;
  • the Zener diodes D1a and D2a can make the constant current source group connected in series to work normally and stably, and have a current shunting function, so as to avoid current fluctuation caused by the characteristics of the constant current source group not being completely uniform, and having
  • Embodiment 6 As shown in FIG. 7, the difference between this embodiment and the fifth embodiment is that: the high power factor constant current LED lighting circuit of the embodiment further includes a fan circuit 4, the fan circuit 4 and the LED light source load. 2, the constant current source circuit 3 is connected in series and connected to the rectified pulsating direct current to form a loop, the motor F of the fan circuit 4 is coupled with a second Zener diode Df, and the second Zener diode Df has a balance Fan motor current, overvoltage protection.
  • Embodiment 7 As shown in FIG.
  • each set of the constant current source device includes two constant currents having the same current specification.
  • source group each serially connected between the constant current source two groups, each group of the constant current source comprises two depletion-mode FET Ql a, Q2a, «, Qlx , Q2x, each of said
  • the constant current source group is respectively coupled with a first Zener diode Dla, D2a, ..., Dlx, D2x, and each group of several LEDs connected in series is shared with a group of the constant current source devices, that is, two constant current source groups.
  • each of the constant current source groups includes two depletion field effect transistors Q11a connected in parallel with each other.
  • Q12a and Q21a, Q22a, multiple depletion field effect transistors are more conducive to dissipating heat from high power.
  • the remaining features of this embodiment are the same as those of the fifth embodiment.
  • Embodiment 9 As shown in FIG. 10, the difference between this embodiment and the seventh embodiment is as follows:
  • the embodiment is suitable for a circuit with a larger load power, and each of the constant current source groups includes a plurality of parallel connections.
  • the FETs Qlla, ..., Qlna and Q21a, ..., Q2na and Qllx, ..., Qlnx and Q21x, ..., Q2nx, multiple depletion field effect transistors are more conducive to the dispersion of high power
  • the remaining features of the present embodiment are the same as those of the seventh embodiment.
  • the invention reduces the reactive power of the circuit by removing the filter capacitor, and the power factor of the circuit of the invention is tested to be greater than 0.85, even up to 0.98 ⁇ 0.99 ; when the pulsating direct current fluctuates within a certain range, the constant current source device can block The current fluctuates, maintains a constant current, so that the current through the LED light source load 2 is constant, and a fluctuating voltage is applied to the constant current source device 3, thereby having a function of stabilizing and stabilizing current, and extending the LED light source
  • the service life of the load 2 is avoided, and the constant current source device 3 is used as a separate device, which is convenient for replacing the peripheral voltage regulation and current stabilization circuit of other existing circuits, so that the circuit components are greatly reduced and the circuit is simple, so the structure of the present invention Simple, low component and long LED life, it is a high power factor constant current LED lighting circuit.
  • the invention can be widely applied to the field of LED lighting circuits.

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Description

高功率因数恒流 LED照明电路
技术领域 本发明涉及一种高功率因数恒流 LED照明电路。
说 背景技术
目前， LED的应用越来越广泛，用于日常室内和户外照明的 LED灯具也
书
正越来越普及。 目前的 LED照明交流驱动电路一般都设有滤波电路以避免电 压的波动， 如图 1 所示， 最简单的滤波电路一般包括至少一个滤波电容 C2 及一个泄放电阻 R2, 复杂的滤波电路则可能包括更多的电容器件， 由于电容 器件的存在， 且滤波电容值较大， 使得电路的无功功率比重较大， 造成整个 电路的功率因数很低，甚至低于 0.5，不符合有些国家的相关技术标准或规范。 为了提高功率因数， 有的 LED照明电路元器件多， 甚至采用 IC模块， 使得 其结构复杂， 成本高。
"MOSFET"是英文 "metal-oxide-semiconductor field effect transistor"的 縮写， 意即 "金属氧化物半导体场效应晶体管" ， 其原理是所有现代集成电 路芯片的基础。 一个耗尽型 MOSFET器件由三个基本部分构成： 源极（S) 、 栅极 （G) 和漏极 （D) 。 一个 N-通道耗尽型 MOS场效应管在源极及漏极之 间接近栅极表面， 有一个与源漏同极性的浅层掺杂层将源极与漏极相连接。 当栅极与源极电压为正时， 其饱和导通电流也随电压增高而增大， 此点与增 强型 MOS场效应管相同。 但是当栅极与源极同电位时， 当漏极施以正压时， 耗尽管先是经过电流急速上升的线性区， 然后就进入恒流导通的饱和区， 此 时的漏极电压被称作饱和电压， 漏极导通电流之大小与浅层掺杂层的浓度与 深度有关， 一般浓度与深度越大则电流越大。 当栅极与源极之间施以负电压， 则通道可以被截止， 导通电流为零， 此时的栅极电压被定义为开启电压， 但 是如果通道浓度太浓、 深度太深， 则栅极将无法截断通道电流。 耗尽型 MOS 管由于在栅极与源极电压为零时， 漏源极电流已呈恒流导通， 这点导致其不 如增强型 MOS 管在逻辑应用上方便， 所以迄未被工业界单独做成器件来使 用。由于耗尽型 MOS管在栅极电压为零时已导通的特性及其在漏极电压增加 时电流基本在饱和区直到漏极雪崩击穿， 故其可作为一个恒流源使用。
发明内容
本发明所要解决的技术问题是克服现有技术的不足，提供一种结构简单、 元器件少、 LED使用寿命长的高功率因数恒流 LED照明电路。 本发明所采用的技术方案是： 本发明包括整流电路、 LED光源负载、 恒 流源电路， 所述高功率因数恒流 LED照明电路不包括滤波电容， 交流电经所 述整流电路整流后变为脉动直流电， 脉动直流电经所述 LED光源负载、所述 恒流源电路构成回路，所述恒流源电路对所述 LED光源负载进行稳压、稳流， 所述 LED光源负载包括至少一组相串联的若干个 LED,所述恒流源电路包括 至少一组恒流源器件， 每组所述恒流源器件包括至少一个耗尽型场效应晶体 管， 所述耗尽型场效应晶体管的漏极为一接点， 所述耗尽型场效应晶体管的 源极与栅极相短接构成另一接点。
进一步， 每组所述恒流源器件包括两个或两个以上互相并联连接的所述 耗尽型场效应晶体管。
每组所述恒流源器件包括至少两个具有相同电流规格的恒流源组， 各所 述恒流源组之间互相串联连接， 每个所述恒流源组均并联接有第一稳压二极 管， 每个所述恒流源组包括至少一个所述耗尽型场效应晶体管。
进一步， 每个所述恒流源组内包括两个或两个以上互相并联连接的所述 耗尽型场效应晶体管。
所述高功率因数恒流 LED照明电路还包括风扇电路，所述风扇电路与所 述 LED光源负载、所述恒流源电路相串联并接于整流后的脉动直流电构成回 路。
所述风扇电路的电机并联接有第二稳压二极管或分流电阻。
所述高功率因数恒流 LED照明电路还包括短路保护电路，所述短路保护 电路接于交流电源的输入端与所述整流电路之间。
所述短路保护电路包括保险管。
所述整流电路采用桥式整流。
交流电输入的电压为 90〜300V之间的特定电压段， 所述特定电压段的 波动范围为 ±30V， 所述 LED光源负载中每组相串联的 LED的个数为 30〜 125个。 本发明的有益效果是： 由于本发明不包括滤波电容， 交流电经所述整流 电路整流后变为脉动直流电， 脉动直流电经所述 LED光源负载、所述恒流源 电路构成回路， 所述恒流源电路对所述 LED光源负载进行稳压、 稳流， 去掉 滤波电容使得电路的无功功率大幅减少， 经测试本发明电路的功率因素大于 0.85， 甚至可高达 0.98〜0.99； 脉动直流电在一定范围内波动时， 所述恒流源 器件可阻止电流的波动，保持恒流，使得通过所述 LED光源负载的电流恒定， 并将波动电压加在所述恒流源器件上， 从而具有稳压、 稳流的功能， 延长所 述 LED光源负载的使用寿命， 避免烧毁； 所述恒流源器件作为一个独立的器 件， 方便替换现有其他电路的外围稳压及稳流电路， 使得电路元件大大减少、 电路简单， 故本发明结构简单、 元器件少、 LED使用寿命长， 是一种高功率 因数恒流 LED照明电路；
由于每组所述恒流源器件包括至少两个具有相同电流规格的恒流源组， 各所述恒流源组之间互相串联连接， 每个所述恒流源组均并联接有第一稳压 二极管， 每个所述恒流源组包括至少一个所述耗尽型场效应晶体管， 相串联 的所述恒流源组可以防止由于直流电电压波动导致所述恒流源器件处于使用 安全的上限， 进一步提高耐压能力， 使得通过 LED的电流更稳定； 所述第一 稳压二极管能够使相串联的所述恒流源组正常稳定工作，具有电流分流作用， 避免各所述恒流源组特性并非完全一致带来的电流波动，具有电流平衡作用， 故本发明耐压效果好， 稳压稳流效果好；
由于每组所述恒流源器件包括两个或两个以上互相并联连接的所述耗尽 型场效应晶体管或者每个所述恒流源组内包括两个或两个以上互相并联连接 的所述耗尽型场效应晶体管， 对于大功率的 LED照明电路， 通过将至少两个 所述耗尽型场效应晶体管并联， 不仅能够提高导通电流， 稳流效果好， 而且 可以避免单个场效应晶体管带来的发热量过大的弊端， 使其功率分散， 散热 效果好， 避免温度过高， 故本发明散热效果好， 稳压稳流效果好。
附图说明
图 1是一种现有的带散热风扇的 LED照明电路的示意图；
图 2是本发明实施例一的电路示意图；
图 3是本发明实施例二的电路示意图；
图 4是本发明实施例三的电路示意图；
图 5是本发明实施例四的电路示意图；
图 6是本发明实施例五的电路示意图；
图 7是本发明实施例六的电路示意图；
图 8是本发明实施例七的电路示意图；
图 9是本发明实施例八的电路示意图；
图 10是本发明实施例九的电路示意图。
具体实施方式
实施例一： 如图 2所示，本实施例的高功率因数恒流 LED照明电路包括整流电路 1 LED光源负载 2、恒流源电路 3、短路保护电路 5， 所述高功率因数恒流 LED 照明电路不包括滤波电容， 所述整流电路 1采用桥式整流即整流桥 D, 当然 也可以采用其他整流方式整流， 交流电输入的电压为可适用各国市电电压的 90〜300V之间的特定电压段， 所述特定电压段的波动范围为 ±30V， 能够保 证市电在 ± 30V范围波动时， 不会烧毁电路内的元器件， 交流电经所述整流 电路 1整流后变为脉动直流电， 脉动直流电经所述 LED光源负载 2、 所述恒 流源电路 3构成回路， 所述恒流源电路 3对所述 LED光源负载 2进行稳压、 稳流，所述 LED光源负载 2包括一组相串联的若干个 LED,即 LED la〜LED (n) a, 每组相串联的 LED的个数 n可视输入电压、 额定功率的高低、 光源 照度的大小的要求而定，一般为 30〜125个，其基本计算标准为 n=90V/3V〜 300V/2.4V=30〜125， 所述恒流源电路 3包括一组恒流源器件， 该组所述恒 流源器件包括一个耗尽型场效应晶体管 Qla， 所述耗尽型场效应晶体管 Qla 的漏极为一接点， 所述耗尽型场效应晶体管的源极与栅极相短接构成另一接 点， 所述短路保护电路 5接于交流电源的输入端与所述整流电路 1之间， 所 述短路保护电路 5包括保险管 FU, 当电路过流时， 所述保险管 FU熔断， 起 到保护作用， 当然也可以采用其他形式的保护电路。 实施例二： 如图 3所示， 本实施例与实施例一的区别在于： 本实施例中， 一组所述 恒流源器件包括两个互相并联连接的所述耗尽型场效应晶体管， 对于大功率 的 LED照明电路， 通过至少两个所述耗尽型场效应晶体管并联， 不仅能够提 高导通电流， 稳流效果好， 而且可以避免单个场效应晶体管带来的发热量过 大的弊端， 使其功率分散， 散热效果好， 避免温度过高。 本实施例的其余特征同实施例一。 实施例三： 如图 4所示， 本实施例与实施例一的区别在于： 本实施例的高功率因数 恒流 LED照明电路还包括风扇电路 4，所述风扇电路 4与所述 LED光源负载 2、所述恒流源电路 3相串联并接于整流后的脉动直流电构成回路， 所述风扇 电路 4的电机 F并联接有第二稳压二极管 Df， 所述第二稳压二极管 Df具有 平衡风扇电机电流、 过压保护的作用。 本实施例的其余特征同实施例一。 实施例四： 如图 5所示， 本实施例与实施例三的区别在于： 本实施例的负载功率较 大， 所述 LED光源负载 2包括多组相串联的若干个 LED, g卩 LED la〜LED (n) a、 ······、 和 LED lx〜LED (n) x， 所述恒流源电路 6包括多组恒流源 器件， 每组所述恒流源器件包括一个耗尽型场效应晶体管 Qla、 ……、 Qlx, 每组相串联的若干个 LED均与一个所述耗尽型场效应晶体管相串联， 串联后 的各组之间再并联， 并联后整体与所述风扇电路 4再串联， 所述风扇电路 4 的电机 F并联接有分流电阻 Rf， 所述分流电阻 Rf具有平衡风扇电机电流、 过流保护的作用。 本实施例的其余特征同实施例三。 实施例五： 如图 6所示， 本实施例与实施例一的区别在于： 本实施例中， 一组所述 恒流源器件包括两个具有相同电流规格的恒流源组， 两个所述恒流源组之间 互相串联连接， 每个所述恒流源组分别并联接有第一稳压二极管 Dla、 D2a, 每个所述恒流源组包括一个耗尽型场效应晶体管 Qla、 Q2a, 相串联的多个所 述恒流源组可以防止由于直流电电压波动导致所述恒流源器件处于使用安全 的上限， 进一步提高耐压能力， 使得通过 LED的电流更稳定； 所述第一稳压 二极管 Dla、 D2a能够使相串联的所述恒流源组正常稳定工作， 具有电流分 流作用， 避免各所述恒流源组特性并非完全一致带来的电流波动， 具有电流 平衡作用， 使得本发明耐压效果好， 稳压稳流效果好。 本实施例的其余特征同实施例一。 实施例六： 如图 7所示， 本实施例与实施例五的区别在于： 本实施例的高功率因数 恒流 LED照明电路还包括风扇电路 4，所述风扇电路 4与所述 LED光源负载 2、所述恒流源电路 3相串联并接于整流后的脉动直流电构成回路， 所述风扇 电路 4的电机 F并联接有第二稳压二极管 Df， 所述第二稳压二极管 Df具有 平衡风扇电机电流、 过压保护的作用。 本实施例的其余特征同实施例五。 实施例七： 如图 8所示， 本实施例与实施例四的区别在于： 本实施例适合负载功率 更大的电路， 每组所述恒流源器件包括两个具有相同电流规格的恒流源组， 两个所述恒流源组之间互相串联连接， 每个所述恒流源组包括两个耗尽型场 效应晶体管 Qla、 Q2a、 ……、 Qlx、 Q2x, 每个所述恒流源组分别并联接有 第一稳压二极管 Dla、 D2a、 ……、 Dlx、 D2x, 每组相串联的若干个 LED均 与一组所述恒流源器件即两个恒流源组共两个耗尽型场效应晶体管相串联， 串联后的各组之间再并联， 并联后整体与所述风扇电路 4再串联； 所述风扇 电路 4的电机 F并联接有第二稳压二极管 Df。 本实施例的其余特征同实施例四。 实施例八： 如图 9所示， 本实施例与实施例五的区别在于： 本实施例中， 每个所述 恒流源组内各包括两个互相并联连接的耗尽型场效应晶体管 Qlla、 Q12a及 Q21a、 Q22a, 多个耗尽型场效应晶体管更有利于分散大功率带来的热量。 本实施例的其余特征同实施例五。 实施例九： 如图 10所示， 本实施例与实施例七的区别在于： 本实施例适合负载功率 更大的电路， 每个所述恒流源组内各包括若干个互相并联连接的耗尽型场效 应晶体管 Qlla、 ……、 Qlna及 Q21a、 ……、 Q2na和 Qllx、 ……、 Qlnx及 Q21x、 ……、 Q2nx， 多个耗尽型场效应晶体管更有利于分散大功率带来的热 本实施例的其余特征同实施例七。 本发明通过去掉滤波电容使得电路的无功功率大幅减少， 经测试本发明 电路的功率因素大于 0.85， 甚至可高达 0.98〜0.99; 脉动直流电在一定范围 内波动时，所述恒流源器件可阻止电流的波动，保持恒流，使得通过所述 LED 光源负载 2的电流恒定， 并将波动电压加在所述恒流源器件 3上， 从而具有 稳压、 稳流的功能， 延长所述 LED光源负载 2的使用寿命， 避免烧毁； 所述 恒流源器件 3作为一个独立的器件， 方便替换现有其他电路的外围稳压及稳 流电路， 使得电路元件大大减少、 电路简单， 因此本发明结构简单、 元器件 少、 LED使用寿命长， 是一种高功率因数恒流 LED照明电路。 本发明可广泛应用于 LED照明电路领域。

Claims
权 利 要 求 书 、 一种高功率因数恒流 LED照明电路， 其特征在于： 包括整流电路 （1 )、 LED光源负载 （2)、 恒流源电路 （3 )， 所述高功率因数恒流 LED照明电 路不包括滤波电容， 交流电经所述整流电路（1 )整流后变为脉动直流电， 脉动直流电经所述 LED光源负载 （2)、 所述恒流源电路 （3 ) 构成回路， 所述恒流源电路 （3 ) 对所述 LED光源负载 （2) 进行稳压、 稳流， 所述 LED光源负载（2 )包括至少一组相串联的若干个 LED, 所述恒流源电路
(3 ) 包括至少一组恒流源器件， 每组所述恒流源器件包括至少一个耗尽 型场效应晶体管， 所述耗尽型场效应晶体管的漏极为一接点， 所述耗尽型 场效应晶体管的源极与栅极相短接构成另一接点。 、 根据权利要求 1所述的高功率因数恒流 LED照明电路， 其特征在于： 每 组所述恒流源器件包括两个或两个以上互相并联连接的所述耗尽型场效 应晶体管。 、 根据权利要求 1所述的高功率因数恒流 LED照明电路， 其特征在于： 每 组所述恒流源器件包括至少两个具有相同电流规格的恒流源组，各所述恒 流源组之间互相串联连接， 每个所述恒流源组均并联接有第一稳压二极 管， 每个所述恒流源组包括至少一个所述耗尽型场效应晶体管。 、 根据权利要求 3所述的高功率因数恒流 LED照明电路， 其特征在于： 每 个所述恒流源组内包括两个或两个以上互相并联连接的所述耗尽型场效 应晶体管。 、 根据权利要求 1所述的高功率因数恒流 LED照明电路， 其特征在于： 所 述高功率因数恒流 LED照明电路还包括风扇电路（4)，所述风扇电路（4) 与所述 LED光源负载（2)、 所述恒流源电路（3 )相串联并接于整流后的 脉动直流电构成回路。 、 根据权利要求 5所述的高功率因数恒流 LED照明电路， 其特征在于： 所 述风扇电路（4)的电机（F)并联接有第二稳压二极管（Df)或分流电阻。 、 根据权利要求 1所述的高功率因数恒流 LED照明电路， 其特征在于： 所 述高功率因数恒流 LED照明电路还包括短路保护电路 （5 )， 所述短路保 护电路 （5 ) 接于交流电源的输入端与所述整流电路 （1 ) 之间。 、 根据权利要求 7所述的高功率因数恒流 LED照明电路， 其特征在于： 所 述短路保护电路 （5 ) 包括保险管 （FU)。 、 根据权利要求 1所述的高功率因数恒流 LED照明电路， 其特征在于： 所 述整流电路 （1 ) 采用桥式整流。 、 根据权利要求 1至 9任意一项所述的高功率因数恒流 LED照明电路，其 特征在于： 交流电输入的电压为 90〜300V之间的特定电压段， 所述特 定电压段的波动范围为 ±30V， 所述 LED光源负载（2 )中每组相串联的 LED的个数为 30〜125个。
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