WO2012175043A1 - Led照明用电源 - Google Patents

Led照明用电源 Download PDF

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Publication number
WO2012175043A1
WO2012175043A1 PCT/CN2012/077393 CN2012077393W WO2012175043A1 WO 2012175043 A1 WO2012175043 A1 WO 2012175043A1 CN 2012077393 W CN2012077393 W CN 2012077393W WO 2012175043 A1 WO2012175043 A1 WO 2012175043A1
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Prior art keywords
led
input voltage
current
detecting unit
circuit
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PCT/CN2012/077393
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English (en)
French (fr)
Inventor
村中将浩
泽田明信
叶大驱
余光钢
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罗姆股份有限公司
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Application filed by 罗姆股份有限公司 filed Critical 罗姆股份有限公司
Priority to EP12803173.9A priority Critical patent/EP2725878B1/en
Publication of WO2012175043A1 publication Critical patent/WO2012175043A1/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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • 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 power source for LED (light-emitting diode) illumination. Background technique
  • incandescent and fluorescent lamps were commonly used for illumination.
  • an incandescent lamp connect the incandescent lamp directly to an AC power source.
  • incandescent lamps are not efficient due to heat generation.
  • the ballast or fluorescent lighting power source is connected to an alternating current power source to illuminate the fluorescent lamp.
  • Fluorescent lamps have higher luminous efficiency than incandescent lamps.
  • fluorescent lamps cannot be applied to triac dimming methods that are widely used in incandescent lighting.
  • LEDs are increasingly used for illumination.
  • the service life of LEDs is generally 40,000 hours or even more than 100,000 hours, higher than incandescent lamps and fluorescent lamps, and the luminous efficiency is also higher.
  • the AC power supply is usually rectified by a diode bridge, and then it is smoothed by a large-capacity electrolytic capacitor and then supplied to the LED. Therefore, in the power supply for LED lighting, a large-capacity electrolytic capacitor must be used.
  • the life of electrolytic capacitors is usually only a few thousand hours to 10,000 hours, which is much shorter than the service life of LEDs. Therefore, the service life of LEDs is usually determined by the electrolytic capacitors.
  • LEDs can be applied to triac dimming methods that are widely used in incandescent lighting.
  • bleed current which maintains the triac conduction as a triac holding current. Therefore, the utilization efficiency of the LED drive current is not high.
  • the present invention has been made in view of the above problems, and an object thereof is to reduce LED lighting
  • the capacity of the capacitor in the power supply replaces the large-capacity electrolytic capacitor with a small-capacity solid capacitor with a longer service life, thereby greatly increasing the service life of the LED illumination lamp.
  • another object of the present invention is to reduce the bleeder current in the power source for LED lighting when the triac dimming method is used.
  • the power supply for LED lighting of the present invention includes a diode bridge, an LED drive circuit, a drive current control unit, an input voltage detecting unit, and a valley filling circuit.
  • a diode bridge rectifies the AC power supply.
  • the drive current control unit is electrically connected to the LED drive circuit and controls the LED drive current.
  • the input voltage detecting unit detects an input voltage obtained by rectifying the AC power source by the diode bridge.
  • the threshold of the input voltage detection unit is set to be equal to or higher than the minimum required voltage of the LED.
  • the valley filling circuit is electrically connected to the LED driving circuit and the input voltage detecting portion, respectively, and has a capacitance. When the input voltage detected by the input voltage detecting unit is equal to or higher than the threshold value, the LED is directly supplied with power. When the input voltage detected by the input voltage detecting unit is lower than the threshold, the LED is powered by the charged capacitor.
  • the constant current driving method since the constant current driving method is employed, a stable LED driving current in which flicker or strobe disappears is obtained.
  • a solid capacitor can be used instead of the electrolytic capacitor, so the life of the LED illuminator is no longer determined by the electrolytic capacitor, so that it can be greatly increased. Moreover, the period in which the AC power source is directly used becomes long, and thus the power factor is improved.
  • the power supply for LED lighting of the present invention further includes a dimming control unit, a current detecting unit, and a bleeder circuit.
  • the dimming control unit is electrically connected between the drive current control unit and the input voltage detecting unit, and controls the LED current set value based on the input voltage conduction angle detected by the input voltage detecting unit.
  • the current detecting unit detects a current in the power source for LED lighting.
  • the bleeder circuit does not operate when the current value detected by the current detecting unit is larger than the set required current, and operates when the current value detected by the current detecting unit is smaller than the set required current.
  • the bleeder current that is consumed unnecessarily can be reduced, and the heat generated by the bleeder discharge flow can be reduced.
  • the LED driving circuit may include a transformer, a driving transistor, and a sensing resistor.
  • the LED is driven by a constant current via a transformer.
  • the driving current control unit controls the pulse width or the height driving of the driving transistor based on the voltage of the sensing resistor, thereby controlling
  • the LED driving circuit may also include an inductor, a driving transistor, and a sensing resistor.
  • the LED is driven by constant current through the inductor.
  • the drive current control unit controls the LED drive current by performing pulse width or height drive control of the drive transistor based on the voltage of the sense resistor.
  • Fig. 1 is a block diagram of a power supply for LED lighting according to a first embodiment of the present invention.
  • Fig. 2 is a schematic diagram showing an output voltage waveform of a valley filling circuit in the power source for LED lighting according to the first embodiment of the present invention.
  • Fig. 3 is a block diagram showing a power supply for LED lighting according to a second embodiment of the present invention.
  • Fig. 4 (a) is a schematic diagram showing an output voltage waveform of a valley filling circuit in the power source for LED lighting according to the second embodiment of the present invention.
  • Fig. 4 (b) is a schematic view showing a current waveform in a triac dimmer according to a second embodiment of the present invention. detailed description
  • Fig. 1 is a block diagram of a power supply for LED lighting according to a first embodiment of the present invention.
  • Fig. 2 is a schematic diagram showing an output voltage waveform of a valley filling circuit in the power source for LED lighting according to the first embodiment of the present invention.
  • the power supply for LED lighting of the present invention comprises a diode bridge 1, an LED drive circuit 2, a drive current control unit 3, an input voltage detecting unit 4, and a Valley Fill circuit 5.
  • the diode bridge 1 rectifies the AC power source and rectifies the AC voltage from the AC power source into a DC input voltage.
  • the LED drive circuit 2 drives the illumination LEDs in a constant current.
  • the LED driving circuit 2 includes a transformer 201, a driving transistor 202, and a sensing resistor 203. The LED drive circuit 2 drives the LEDs in a constant current via the transformer 201.
  • the drive current control unit 3 is electrically connected to the LED drive circuit 2, and performs pulse width or height drive control of the drive transistor 202 based on the voltage of the sense resistor 203 to control the LED drive current.
  • the input voltage detecting unit 4 detects an input voltage obtained by rectifying the alternating current power by the diode bridge 1.
  • the threshold value of the input voltage detecting unit 4 is set to be equal to or higher than the minimum necessary voltage value of the LED.
  • the valley filling circuit 5 is electrically connected to the LED driving circuit 2 and the input voltage detecting unit 4, respectively.
  • the valley filling circuit 5 is provided with a capacitor 501.
  • the LED When the input voltage detected by the input voltage detecting unit 4 is equal to or higher than the threshold value, the LED is directly supplied with power.
  • the LED When the input voltage detected by the input voltage detecting portion 4 is lower than the threshold value, the LED is supplied with power from the charged capacitor 501.
  • the power source for LED lighting further includes a power supply circuit 6.
  • the power supply circuit 6 supplies power to the inside of the LED lighting power supply.
  • the operation of the power supply for LED lighting of the first embodiment will be described.
  • the AC power is rectified by the diode bridge 1, and the AC voltage from the AC power source is rectified into a DC input voltage.
  • the input voltage reaches the valley filling circuit 5.
  • the input voltage detecting unit 4 always detects the input voltage.
  • the output voltage waveform of the valley filling circuit 5 is as shown in Fig. 2.
  • the LED is directly supplied with power.
  • the LED is powered by the charged capacitor 501 in the valley filling circuit 5, that is, after the rectification
  • the low voltage portion (low valley portion) of the waveform of the input voltage is supplemented.
  • the drive current control unit 3 performs pulse width or height drive control of the drive transistor 202 based on the voltage of the sense resistor 203, so that the LED drive circuit 2 uses the output voltage from the valley fill circuit 5 and constantly drives the LED via the transformer 201.
  • the LED is stably illuminated. According to the first embodiment, since the constant current driving method is employed, a stable LED driving current in which flicker or stroboscopic disappears is obtained.
  • a solid capacitor can be used instead of the electrolytic capacitor, so that the service life of the LED lamp is no longer determined by the electrolytic capacitor, and can be greatly improved.
  • the period in which the AC power source is directly used becomes long, and the power factor is improved.
  • the present invention is also applicable to an AC/DC converter.
  • a constant voltage output circuit can be used instead of the LED drive circuit 2.
  • the drive current control unit 3 is replaced with the drive voltage control unit accordingly.
  • Fig. 3 is a block diagram showing a power supply for LED lighting according to a second embodiment of the present invention.
  • FIG. 4(a) is a schematic diagram showing an output voltage waveform of a valley filling circuit in the power source for LED lighting according to the second embodiment of the present invention.
  • Fig. 4 (b) is a schematic view showing a current waveform in a triac dimmer according to a second embodiment of the present invention.
  • the power supply for LED lighting according to the second embodiment of the present invention can be applied to a triac dimming method widely used in incandescent lighting.
  • the LED lighting power supply of the second embodiment differs from the first embodiment in the LED lighting power supply in that it further includes a dimming control unit 8, a current detecting unit 9, and a bleeder circuit 10.
  • the dimming control unit 8 is electrically connected between the drive current control unit 3 and the input voltage detecting unit 4, and controls the LED current setting value based on the input voltage conduction angle detected by the input voltage detecting unit 4.
  • the current detecting unit 9 detects a current in the power source for LED lighting.
  • the bleeder circuit 10 does not operate when the current value detected by the current detecting unit 4 is greater than the set required current, and when the current value detected by the current detecting unit 4 is smaller than the set required current. jobs.
  • the output voltage waveform of the valley filling circuit 5 is as shown in Fig. 4(a).
  • the LED is directly supplied with power.
  • the LED is powered by the charged capacitor 501 in the valley filling circuit 5, that is, after the rectification
  • the low voltage portion (low valley portion) of the waveform of the input voltage is supplemented.
  • the current detecting unit 9 always detects the current in the LED lighting power source. Since the triac is turned on, it must maintain a certain current inside it to maintain its conduction. Therefore, when the current value detected by the current detecting portion 4 is greater than the triac holding current, the bleeder circuit 10 does not operate, and the current detecting portion 4 When the detected current value is less than the triac holding current, the bleeder circuit 10 operates so that the current inside the triac is maintained above the holding current. In this case, the current waveform in the triac dimmer 7 is shown in Figure 4(b).
  • the LED drive current since the LED drive current is actively utilized, it is used as a triac holding current, so that the bleeder current that is consumed unnecessarily can be reduced, and the heat generated by the bleeder current can be reduced.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本发明涉及一种LED照明用电源，其包括二极管电桥、LED驱动电路、驱动电流控制部、输入电压检测部以及填谷电路。二极管电桥，对交流电源进行整流。LED驱动电路，对LED进行恒流驱动。驱动电流控制部，与LED驱动电路电连接，并控制LED驱动电流。输入电压检测部，检测二极管电桥对交流电源进行整流后的输入电压。输入电压检测部的阀值设定在LED的最低必要电压值以上。填谷电路，与LED驱动电路和输入电压检测部电连接，并具有电容。当输入电压检测部检测到的输入电压为阀值以上时，直接对LED进行供电，当输入电压检测部检测到的输入电压低于阀值时，由已充电的电容对LED进行供电。

Description

LED照明用电源 技术领域
本发明涉及 LED (light-emitting diode)照明用电源。 背景技术
以往， 通常使用白炽灯和荧光灯进行照明。 在使用白炽灯时， 将 白炽灯直接与交流电源相连。 然而， 白炽灯由于发热而导致其发光效 率不高。 另一方面， 在使用荧光灯时， 将镇流器或荧光灯照明用电源 与交流电源相连， 从而点亮荧光灯。 荧光灯的发光效率高于白炽灯， 然而， 荧光灯无法应用于在白炽灯照明中广泛使用的三端双向可控硅 (triac)调光方式。
目前，为了满足节能化的要求，越来越广泛地使用 LED进行照明。 LED的使用寿命一般为 4万小时甚至 10万小时以上， 高于白炽灯和 荧光灯， 且发光效率也更高。
在使用 LED时，通常先利用二极管电桥对交流电源进行整流，接 着利用大容量的电解电容将其平滑化， 然后供给至 LED。 因此， 在 LED照明用电源中， 必须使用大容量的电解电容。 然而， 电解电容的 使用寿命通常只有数千小时至 1万小时， 大大短于 LED的使用寿命， 所以， LED的使用寿命通常由该电解电容决定。
另外， LED能够应用于在白炽灯照明中广泛使用的 triac调光方 式。 然而， 在利用二极管电桥对交流电源进行整流， 接着利用大容量 的电解电容将其平滑化之后， 必须始终保持一定的电流 (泄放电流)， 该电流作为 triac保持电流而维持 triac的导通， 因此， LED驱动电流 的利用效率不高。 发明内容
本发明是鉴于上述问题而完成的，其目的在于，减小 LED照明用 电源中的电容的容量， 将大容量的电解电容置换成使用寿命更长的小 容量的固体电容， 从而大幅地提升 LED照明灯的使用寿命。 另外， 本 发明的另一个目的在于， 减小使用 triac调光方式时的 LED照明用电 源中的泄放电流。
本发明的 LED照明用电源， 包括二极管电桥、 LED驱动电路、 驱动电流控制部、 输入电压检测部以及填谷电路。 二极管电桥， 对交 流电源进行整流。 LED驱动电路， 对 LED进行恒流驱动。 驱动电流 控制部， 与 LED驱动电路电连接， 并控制 LED驱动电流。 输入电压 检测部， 检测二极管电桥对交流电源进行整流后的输入电压。 输入电 压检测部的阀值设定在 LED 的最低必要电压值以上。 填谷电路， 与 LED驱动电路和输入电压检测部分别电连接， 并具有电容。 当输入电 压检测部检测到的输入电压为阀值以上时，直接对 LED进行供电。 当 输入电压检测部检测到的输入电压低于阀值时， 由已充电的电容对 LED进行供电。
依照上述构成， 由于采用了恒流驱动方式， 因而获得了闪烁或频 闪消失的稳定的 LED驱动电流。另外， 能够使用固体电容来代替电解 电容， 因而 LED照明灯的使用寿命不再由电解电容决定，从而能够大 幅地提升。 而且， 直接利用交流电源的时期变长， 因而功率因数提高。
另夕卜，本发明的 LED照明用电源还包括调光控制部、 电流检测部 以及泄放电路。 调光控制部， 电连接在驱动电流控制部和输入电压检 测部之间， 基于输入电压检测部检测到的输入电压导通角度， 控制 LED电流设定值。 电流检测部， 检测 LED照明用电源中的电流。 泄 放电路， 在电流检测部检测到的电流值大于设定的所需电流时不工 作， 在电流检测部检测到的电流值小于设定的所需电流时工作。
依照上述构成， 由于积极地利用了 LED驱动电流， 以作为 triac 保持电流， 因而能够减少无益地消耗的泄放电流， 能够减小因泄放电 流而产生的发热。
另夕卜， LED驱动电路可以包括变压器、驱动晶体管以及传感电阻。 这种情况下， 经由变压器来恒流驱动 LED。 驱动电流控制部基于传感 电阻的电压， 进行驱动晶体管的脉沖宽度或高度驱动控制， 从而控制
LED驱动电流。
另外， LED驱动电路也可以包括电感、驱动晶体管以及传感电阻。 这种情况下， 经由电感来恒流驱动 LED。 驱动电流控制部基于传感电 阻的电压， 进行驱动晶体管的脉沖宽度或高度驱动控制， 从而控制 LED驱动电流。 附图说明
图 1是本发明的第一实施方式的 LED照明用电源的模块图。
图 2是显示本发明的第一实施方式的 LED照明用电源中的填谷电 路的输出电压波形的示意图。
图 3是本发明的第二实施方式的 LED照明用电源的模块图。
图 4(a)是显示本发明的第二实施方式的 LED照明用电源中的填谷 电路的输出电压波形的示意图。
图 4(b)是显示本发明的第二实施方式涉及的 triac调光器中的电流 波形的示意图。 具体实施方式
以下， 参照图 1至图 2, 说明本发明的第一实施方式。
图 1是本发明的第一实施方式的 LED照明用电源的模块图。 图 2 是显示本发明的第一实施方式的 LED 照明用电源中的填谷电路的输 出电压波形的示意图。
如图 1所示，本发明的 LED照明用电源，包括二极管电桥 1、 LED 驱动电路 2、驱动电流控制部 3、输入电压检测部 4以及填谷 (Valley Fill) 电路 5。
二极管电桥 1 , 对交流电源进行整流， 将来自交流电源的交流电 压整流成直流输入电压。 LED驱动电路 2 , 对照明用 LED进行恒流驱动。 该 LED驱动电 路 2包括变压器 201、 驱动晶体管 202以及传感电阻 203。 LED驱动 电路 2经由变压器 201来恒流驱动 LED。
驱动电流控制部 3,与 LED驱动电路 2电连接，基于传感电阻 203 的电压， 进行驱动晶体管 202的脉沖宽度或高度驱动控制， 从而控制 LED驱动电流。
输入电压检测部 4, 检测二极管电桥 1对交流电源进行整流后的 输入电压。该输入电压检测部 4的阀值设定在 LED的最低必要电压值 以上。
填谷电路 5 ,与 LED驱动电路 2和输入电压检测部 4分别电连接。 该填谷电路 5具备电容 501。 当输入电压检测部 4检测到的输入电压 为阀值以上时，直接对 LED进行供电。 当输入电压检测部 4检测到的 输入电压低于阀值时， 由已充电的电容 501对 LED进行供电。
此外， LED照明用电源还具备电源电路 6。 该电源电路 6对 LED 照明用电源的内部进行供电。
接着， 对第一实施方式的 LED照明用电源的工作进行说明。 首先， 由二极管电桥 1对交流电源进行整流， 将来自交流电源的 交流电压整流成直流输入电压。 然后， 该输入电压到达填谷电路 5。 并且， 输入电压检测部 4始终对该输入电压进行检测。
填谷电路 5的输出电压波形如图 2所示。 当输入电压检测部 4检 测到的输入电压为阀值以上时，直接对 LED进行供电。 当输入电压检 测部 4检测到的输入电压低于阀值时，即，有可能不能充分地驱动 LED 时， 由填谷电路 5内的已充电的电容 501对 LED进行供电， 即， 对整 流后的输入电压的波形的低电压部 (低谷部分)进行补充。
驱动电流控制部 3基于传感电阻 203的电压，进行驱动晶体管 202 的脉沖宽度或高度驱动控制，使得 LED驱动电路 2利用来自填谷电路 5的输出电压， 并经由变压器 201来恒流驱动 LED,使 LED稳定地发 光。 依照该第一实施方式， 由于采用了恒流驱动方式， 因而获得了闪 烁或频闪消失的稳定的 LED驱动电流。
另夕卜，依照该第一实施方式，能够使用固体电容来代替电解电容， 因而 LED照明灯的使用寿命不再由电解电容决定，从而能够大幅地提 升。
而且， 依照该第一实施方式， 直接利用交流电源的时期变长， 因 而功率因数提高。
虽然第一实施方式涉及 LED照明用电源，但是本发明也可以应用 于交流 /直流变换器。在这种情况下，可以使用恒压输出电路代替 LED 驱动电路 2。 这时， 将驱动电流控制部 3相应地替换为驱动电压控制 部。
以下， 参照图 3至图 4(b), 说明本发明的第二实施方式。
图 3是本发明的第二实施方式的 LED照明用电源的模块图。 图
4(a)是显示本发明的第二实施方式的 LED照明用电源中的填谷电路的 输出电压波形的示意图。 图 4(b)是显示本发明的第二实施方式涉及的 triac调光器中的电流波形的示意图。
此外， 对与上述的第一实施方式同样的部件标记相同的符号， 并 省略说明。
本发明的第二实施方式的 LED 照明用电源能够应用于在白炽灯 照明中广泛使用的三端双向可控硅 (triac)调光方式。相对于第一实施方 式的 LED照明用电源而言， 第二实施方式的 LED照明用电源的不同 点在于， 其还包括调光控制部 8、 电流检测部 9以及泄放电路 10。
调光控制部 8, 电连接在驱动电流控制部 3和输入电压检测部 4 之间， 基于输入电压检测部 4检测到的输入电压导通角度， 控制 LED 电流设定值。
电流检测部 9 , 检测 LED照明用电源中的电流。
泄放电路 10,在电流检测部 4检测到的电流值大于设定的所需电 流时不工作， 在电流检测部 4检测到的电流值小于设定的所需电流时 工作。
接着，对第二实施方式的 LED照明用电源的工作进行说明。其中， 省略了与第一实施方式相同的部分。
在利用 triac调光器 7进行线性调光的情况下，填谷电路 5的输出 电压波形如图 4(a)所示。 同样地， 当输入电压检测部 4检测到的输入 电压为阀值以上时，直接对 LED进行供电。 当输入电压检测部 4检测 到的输入电压低于阀值时， 即， 有可能不能充分地驱动 LED时， 由填 谷电路 5内的已充电的电容 501对 LED进行供电， 即，对整流后的输 入电压的波形的低电压部 (低谷部分)进行补充。
电流检测部 9, 始终对 LED照明用电源中的电流进行检测。 由于 triac导通后， 必须在其内部保持一定的电流， 以维持其导通， 因此， 当电流检测部 4检测到的电流值大于 triac保持电流时， 泄放电路 10 不工作， 当电流检测部 4检测到的电流值小于 triac保持电流时， 泄放 电路 10工作， 使得 triac内部的电流维持在保持电流以上。 这种情况 下， triac调光器 7中的电流波形如图 4(b)所示。
依照该第二实施方式， 由于积极地利用了 LED驱动电流，将其作 为 triac保持电流， 因而能够减少无益地消耗的泄放电流， 能够减小因 泄放电流而产生的发热。
以上， 利用上述的实施方式， 对本发明进行了说明。 但本发明不 限于上述的实施方式。 例如， 可以使用电感来代替上述的变压器 201 , 这种情况下， 也能够起到与变压器 201同样的作用。 本领域的技术人 员在不脱离本发明的要旨的范围的情况下， 能够基于设计要求等而进 行各种变形。 这些变形均包含在权利要求书的保护范围之内。

Claims

1. 一种 LED照明用电源， 包括二极管电桥、 LED驱动电路、 驱 动电流控制部、 输入电压检测部以及填谷电路， 其中，
所述二极管电桥， 对交流电源进行整流，
所述 LED驱动电路， 对 LED进行恒流驱动，
所述驱动电流控制部，与所述 LED驱动电路电连接，并控制 LED 马区动电巟，
所述输入电压检测部， 检测所述二极管电桥对交流电源进行整流 后的输入电压，所述输入电压检测部的阀值设定在 LED的最低必要电 压值以上，
所述填谷电路，与所述 LED驱动电路和所述输入电压检测部分别 电连接， 并具有电容， 当所述输入电压检测部检测到的输入电压为阀 值以上时，直接对 LED进行供电， 当所述输入电压检测部检测到的输 入电压低于阀值时， 由已充电的所述电容对 LED进行供电。
2. 根据权利要求 1所述的 LED照明用电源， 其特征在于， 所述 LED照明用电源还包括调光控制部、电流检测部以及泄放电 路，
所述调光控制部， 电连接在所述驱动电流控制部和所述输入电压 检测部之间， 基于所述输入电压检测部检测到的输入电压导通角度， 控制 LED电流设定值，
所述电流检测部， 检测所述 LED照明用电源中的电流， 所述泄放电路， 在所述电流检测部检测到的电流值大于设定的所 需电流时不工作， 在所述电流检测部检测到的电流值小于设定的所需 电流时工作。
3. 根据权利要求 1或 2所述的 LED照明用电源， 其特征在于， 所述 LED驱动电路包括变压器、 驱动晶体管以及传感电阻， 经由所述变压器来恒流驱动 LED, 所述驱动电流控制部基于所述传感电阻的电压， 进行所述驱动晶 体管的脉沖宽度或高度驱动控制， 从而控制 LED驱动电流。
4. 根据权利要求 1或 2所述的 LED照明用电源， 其特征在于， 所述 LED驱动电路包括电感、 驱动晶体管以及传感电阻， 经由所述电感来恒流驱动 LED,
所述驱动电流控制部基于所述传感电阻的电压， 进行所述驱动晶 体管的脉沖宽度或高度驱动控制， 从而控制 LED驱动电流。
5. 一种交流 /直流变换器， 包括二极管电桥、 恒压输出电路、 驱 动电压控制部、 输入电压检测部以及填谷电路， 其中，
所述二极管电桥， 对交流电源进行整流，
所述恒压输出电路， 输出恒定电压，
所述驱动电压控制部， 与所述恒压输出电路电连接， 并控制所述 恒压输出电路的电流，
所述输入电压检测部， 检测所述二极管电桥对交流电源进行整流 后的输入电压，
所述填谷电路， 与所述恒压输出电路和所述输入电压检测部分别 电连接， 并具有电容， 当所述输入电压检测部检测到的输入电压为阀 值以上时， 直接对所述恒压输出电路进行供电， 当所述输入电压检测 部检测到的输入电压低于阀值时， 由已充电的所述电容对所述恒压输 出电路进行供电。
PCT/CN2012/077393 2011-06-22 2012-06-22 Led照明用电源 WO2012175043A1 (zh)

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