WO2014079134A1 - 一种led恒流电源电路 - Google Patents

一种led恒流电源电路 Download PDF

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Publication number
WO2014079134A1
WO2014079134A1 PCT/CN2013/000141 CN2013000141W WO2014079134A1 WO 2014079134 A1 WO2014079134 A1 WO 2014079134A1 CN 2013000141 W CN2013000141 W CN 2013000141W WO 2014079134 A1 WO2014079134 A1 WO 2014079134A1
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WO
WIPO (PCT)
Prior art keywords
constant current
led
chip
voltage
power supply
Prior art date
Application number
PCT/CN2013/000141
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English (en)
French (fr)
Inventor
文国军
朱明星
Original Assignee
上海顿格电子贸易有限公司
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Publication date
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Publication of WO2014079134A1 publication Critical patent/WO2014079134A1/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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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 invention relates to an AC constant current power supply circuit applied to an LED, in particular to an LED constant current power supply circuit.
  • LED lamps are widely used in commercial lighting and office lighting, which brings great convenience to people's daily life work.
  • One of the characteristics of LED lights is that they cannot be directly powered by the mains. Therefore, LED lamps need to provide corresponding power supply as illumination lamps.
  • LED power supplies are commonly used on the market.
  • the RC circuit or integrated IC control power supply is usually used as the LED power supply.
  • the advantages of the RC circuit are fewer peripheral devices, simple wiring, and small PCB size.
  • the RC circuit is a regulated power supply instead of a constant current power supply. It needs to increase the output current with high power resistance, low constant current accuracy, low efficiency, poor regulation, and suitable for high voltage and low current LED lamp beads.
  • the integrated IC control power supply has high current accuracy, high efficiency and good regulation, and is suitable for any different LED lamp bead.
  • the disadvantages are many peripheral devices, complicated wiring, and high cost.
  • the object of the present invention is to overcome the shortcomings of the conventional LED constant current power supply circuit, and to provide an LED constant current power supply circuit with few peripheral devices, simple lines, low cost, and high current control precision.
  • the technical solution of the present invention is an LED constant current power supply circuit, characterized in that the circuit is rectified by an alternating voltage through a rectifier bridge stack, and then the input voltage waveform is smoothed by a filter, and the input voltage after passing through the electrolytic capacitor filter Turning into a DC voltage, the DC voltage is applied to the LED after passing through a constant current IC chip, and the current range on the LED is adjusted by the resistors R2 and R3 connected to the constant current IC chip, and the electrolytic capacitor filter and the constant A constant current IC chip protection circuit composed of a Zener diode ZD1, a transistor Q1, and a resistor R1 is disposed between the IC chips.
  • the rectifier bridge stack is formed by four bridges BD1; the filter is an electrolytic capacitor filter.
  • the beneficial effects of the invention are that the provided LED constant current driving circuit has few peripheral components, simple circuit, low cost and high current control precision.
  • FIG. 1 is a schematic diagram of an LED constant current power supply circuit of the present invention.
  • the LED constant current power supply circuit of the invention is shown in FIG. 1.
  • the AC voltage is input to the rectifier bridge rectified by the four diodes BD1 through the fuse F1 and the parallel varistor RV, and the filter is formed by the electrolytic capacitor C1, and the electrolytic capacitor is used.
  • the output end of C1 is connected to the collector of the transistor Q1 and the base resistor R1 of the transistor Q1, and the other end of the output of the electrolytic capacitor C1 is grounded.
  • the emitter of the transistor Q1 is connected to the input terminal Vin of the constant current IC chip U1, the transistor Q1
  • the base is connected to the output terminal Vout of the constant current IC chip U1 through the Zener ZD1, and the output terminal Vout of the constant current IC chip U1 passes through the sampling resistors R2 and R3 and the 1 end of the constant current IC chip U1 and the LED1, LED2, LED3 and
  • the positive electrodes of the LEDs 4 are connected in series, and the negative electrodes of the LEDs 1, LED2, LED3 and the LEDs 4 are connected to the ground of the electrolytic capacitor CI of the electrolytic capacitor filter.
  • the working principle of the invention During the gradual rise of the alternating voltage, the constant current IC chip U1 gradually increases the voltage across the Vin and Vout of the constant current IC chip U1 in order to ensure that the current flowing through the circuit is constant. However, the voltage of the constant current IC chip U1 is lower than the input voltage. When the input voltage limit of the constant current IC chip U1 is exceeded, the constant current IC chip U1 is burnt, so it is necessary to add a constant current IC chip protection circuit to the circuit. .
  • the Zener diode ZD1, the transistor Q1, and the resistor R1 form a protection circuit of the constant current IC chip U1.
  • the constant current IC chip U1 works normally.
  • the voltage across the Vin and Vout of the constant current IC chip U1 exceeds the voltage of the Zener diode ZD1
  • the AC voltage continues to rise, causing the voltage on the transistor Q1 to gradually rise, but at this time.
  • the constant current IC chip U1 maintains the same voltage.
  • the transistor Q1 should use a high-voltage three-stage tube, which can withstand high voltage, so as to ensure that the transistor Q1 does not suffer from high voltage and the transistor Q1 breaks down.
  • the LED supply voltage is an AC voltage that is converted into a DC voltage by an electrolytic capacitor, it is applied to the circuit.
  • the LED must be a high voltage constant current lamp bead. This circuit is suitable for high voltage and low current LEDs.

Landscapes

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

Abstract

一种LED恒流电源电路，该电路是由交流电压经整流桥堆（BD1）整流，再经电解电容滤波器（C1）使输入电压波形平滑，通过该电解电容滤波器（C1）后的输入电压转变成一个直流电压，该直流电压经过一个恒流的IC芯片（U1）后加载到LED上，通过与恒流IC芯片（U1）连接的电阻（R2、R3）调节LED上的电流范围，在所述电解电容滤波器（C1）和恒流的IC芯片（U1）之间设置一个由稳压二极管（ZD1）、三极管（Q1）和电阻（R1）构成的恒流IC芯片（U1）的保护电路。上述LED恒流电源电路所提供的LED恒流驱动电路外围器件少、线路简单、成本低廉、电流控制精度高。

Description

一种 LED恒流电源电路
技术领域
本发明涉及一种应用于 LED的交流恒流电源电路， 特别涉及一种 LED恒流电源电路。
背景技术
LED灯作为替代荧光灯， 在商业照明， 办公照明使用广泛性， 给人们的日常生活工作 带来极大的方便。 LED灯一大特点是不能用市电直接供电， 因此 LED灯要作为照明灯就需 要提供相应的电源驱动， 第二为了保证 LED灯恒流不变的电路设计，， 现在市场上常用的 LED电源通常用 RC电路或集成 IC控制电源作为 LED电源。 RC电路优点是外围器件少、 线 路简单、 PCB板尺寸小。 缺点 RC电路是稳压电源而非恒流电源， 需要用增加大功率电阻控 制输出电流、 恒流精度低、 效率低、 调节性差、 适合高电压低电流 LED灯珠。 集成 IC控 制电源优点电流精度高、 效率高、 调节性好， 适用于任意不同的 LED灯珠。 缺点为外围器 件多、 线路复杂、 成本高。
发明内容
本发明的目的为了克服现有 LED恒流电源电路的缺点， 提供一种外围器件少， 线路简 单， 成本低廉， 电流控制精度高的 LED恒流电源电路。
本发明的技术方案是， 一种 LED恒流电源电路， 其特点是， 该电路是由交流电压经整 流桥堆整流， 再经滤波器使输入电压波形平滑， 通过电解电容滤波器后的输入电压转变成 一个直流电压， 该直流电压经过一个恒流的 IC芯片后加载到 LED上， 通过与恒流 IC芯片 连接的电阻 R2、 R3调节 LED上的电流范围， 在所述电解电容滤波器和恒流的 IC芯片之间 设置一个由稳压二极管 ZD1 , 三极管 Q1 , 电阻 R1构成的恒流 IC芯片保护电路。
所述的整流桥堆由 4个两极管 BD1组成桥路而成； 滤波器为电解电容滤波器。
本发明的有益效果是所提供的 LED恒流驱动电路外围器件少， 线路简单， 成本低廉， 电流控制精度高。
附图说明
图 1为本发明 LED恒流电源电路原理图。
具体实施方式
本发明 LED恒流电源电路由图 1所示， 交流电压经保险丝 Fl、 并联压敏电阻 RV输入 到由四个二极管 BD1组成的整流桥堆整流， 经由电解电容 C1构成的滤波器滤波， 电解电 容 C1的输出一端分别和三极管 Q1集电极和与三极管 Q1的基极电阻 R1连接， 电解电容 C1 输出的另一端接地， 所述三极管 Q1的发射极和恒流 IC芯片 U1输入端 Vin连接， 三极管 Q1的基极通过稳压管 ZD1和恒流 IC芯片 U1输出端 Vout连接，恒流 IC芯片 U1输出端 Vout 通过采样电阻 R2、 R3分别和恒流 IC芯片 U1的 1端及 LED1、 LED2、 LED3和 LED4串联的 正极相连接， LED1、 LED2、 LED3和 LED4串联的负极和电解电容滤波器的电解电容 CI的接 地端连接。
本发明的工作原理： 当交流电压逐步上升过程中， 恒流 IC芯片 U1为了保证流过其电 路的电流恒定， 恒流 IC芯片 U1的 Vin与 Vout两端上的电压逐渐升高。但恒流 IC芯片 U1 最高承受的电压较输入电压低， 当超过恒流 IC芯片 U1 的输入电压限值时会导致恒流 IC 芯片 U1的烧毁， 所以需要在电路上增加恒流 IC芯片保护电路。 使用稳压二极管 ZD1， 三 极管 Ql， 电阻 R1构成恒流 IC芯片 U1的保护电路， 当输入电压逐步上升过程中， 当恒流 IC芯片 U1的 Vin与 Vout两端电压没有超过稳压二极管 ZD1耐压电压时， 恒流 IC芯片 U1 正常工作， 当恒流 IC芯片 U1的 Vin与 Vout两端电压超过稳压二极管 ZD1电压后， 交流 电压继续升高， 使得三极管 Q1上电压逐渐升高， 但此时恒流 IC芯片 U1上保持电压不变。 此时三极管 Q1应选用高压三级管， 可以承受高电压， 以保证三极管 Q1不会因为承受高压 而导致三极管 Q1击穿。
由于提供 LED供电电压是交流电压通过电解电容转换成直流电压， 所以应用于该电路 的 LED必须是高压恒流灯珠。 该电路适合于高电压低电流的 LED。

Claims

权利要求：
1. 一种 LED恒流电源电路， 其特征在于， 该电路是由交流电压经整流桥堆整流， 再经电 解电容滤波器使输入电压波形平滑， 通过电解电容滤波器后的输入电压转变成一个直流电 压， 该直流电压经过一个恒流的 IC芯片后加载到 LED上， 通过与恒流 IC芯片连接的电阻 R2、 R3调节 LED上的电流范围， 在所述的电解电容滤波器和恒流的 IC芯片之间设置一个 由稳压二极管 ZD1 , 三极管 Ql， 电阻 R1构成的恒流 IC芯片保护电路。
PCT/CN2013/000141 2012-11-23 2013-02-16 一种led恒流电源电路 WO2014079134A1 (zh)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110994799A (zh) * 2019-12-16 2020-04-10 广州市科士达电源设备有限公司 智能配电柜

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Publication number Priority date Publication date Assignee Title
CN102933005A (zh) * 2012-11-23 2013-02-13 上海顿格电子贸易有限公司 一种led恒流电源电路
WO2015000279A1 (zh) * 2013-07-03 2015-01-08 宁波宜升光电科技有限公司 超薄投光灯
CN103747585B (zh) * 2014-01-10 2016-03-02 陈榕 一种36v以下的照明系统
CN108183607A (zh) * 2018-02-11 2018-06-19 浙江亿邦信息技术有限公司 一种电源控制电路及应用

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JP2000162677A (ja) * 1998-11-25 2000-06-16 Eruteru:Kk 発光素子駆動回路
CN201315687Y (zh) * 2008-11-11 2009-09-23 康佳集团股份有限公司 一种led恒流源通道的保护电路
CN201374838Y (zh) * 2009-03-11 2009-12-30 四川九洲铭伟半导体照明有限公司 一种led驱动电源
CN102933005A (zh) * 2012-11-23 2013-02-13 上海顿格电子贸易有限公司 一种led恒流电源电路
CN202941013U (zh) * 2012-11-23 2013-05-15 上海顿格电子贸易有限公司 一种led恒流电源电路

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CN201369858Y (zh) * 2008-12-12 2009-12-23 天津市微仪电子仪器科技有限公司 宽电压范围内为led灯提供稳定的工作电流的装置

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Publication number Priority date Publication date Assignee Title
JP2000162677A (ja) * 1998-11-25 2000-06-16 Eruteru:Kk 発光素子駆動回路
CN201315687Y (zh) * 2008-11-11 2009-09-23 康佳集团股份有限公司 一种led恒流源通道的保护电路
CN201374838Y (zh) * 2009-03-11 2009-12-30 四川九洲铭伟半导体照明有限公司 一种led驱动电源
CN102933005A (zh) * 2012-11-23 2013-02-13 上海顿格电子贸易有限公司 一种led恒流电源电路
CN202941013U (zh) * 2012-11-23 2013-05-15 上海顿格电子贸易有限公司 一种led恒流电源电路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110994799A (zh) * 2019-12-16 2020-04-10 广州市科士达电源设备有限公司 智能配电柜

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