WO2012037803A1 - Led恒流驱动电路 - Google Patents

Led恒流驱动电路 Download PDF

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Publication number
WO2012037803A1
WO2012037803A1 PCT/CN2011/071709 CN2011071709W WO2012037803A1 WO 2012037803 A1 WO2012037803 A1 WO 2012037803A1 CN 2011071709 W CN2011071709 W CN 2011071709W WO 2012037803 A1 WO2012037803 A1 WO 2012037803A1
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Prior art keywords
transistor
constant current
driving circuit
led
current driving
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PCT/CN2011/071709
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English (en)
French (fr)
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王汉忠
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Wang Hanzhong
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Publication of WO2012037803A1 publication Critical patent/WO2012037803A1/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
    • H05B45/395—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 utility model relates to a constant current driving circuit, in particular to an LED constant current driving circuit.
  • LED Light Emitting Diode
  • LED is a low-voltage, direct-current semiconductor device that needs to operate in a constant current environment. For ordinary commercial power, it must be subjected to voltage conversion and constant current control before it can be supplied to the LED to complete the above process.
  • the circuit or device is often referred to as an LED driver or driver circuit.
  • the commonly used driving schemes are: switching constant current driving, RC capacitive driving and linear constant current driving.
  • the switching type constant current drive has many advantages such as conversion efficiency and high constant current precision, but its disadvantage is that the circuit is complicated and the cost is high. Moreover, due to the use of a high-frequency oscillating circuit, certain electromagnetic fields are generated in the surrounding environment and the power grid during operation. Radiation, especially when used in large numbers, is particularly problematic. If not handled properly, it will cause interference to surrounding electrical equipment and even pollution to the power grid.
  • the RC-capacitor drive uses a capacitor to step down and limit the AC current. It is supplied to the LED after being rectified by the rectifier. It is characterized by low cost and is currently used in a low-end and low-cost market. The disadvantage is low efficiency, large reactive power loss in the circuit, and its power factor is only about 0.2-0.6. According to the US "Energy Star" and the relevant regulations of the European Union, the PF value (power factor) of the home lighting equipment should be greater than 0.7. The PF value of commercial lighting should be greater than 0.9. Obviously, luminaires with RC volume are not suitable for export. In addition, the voltage drop capacitor has a small internal resistance at the moment of power-on, so the impact current to the load at the moment of power-on is quite large, which will greatly shorten the service life of the LED.
  • Linear constant current drive usually used in low voltage, DC environment (such as 12-24V), if used on 220V (or 110V) mains, you must first convert the high voltage to a suitable voltage with a switching power supply or transformer. Then carry out constant current control.
  • the disadvantages are high cost and low efficiency, so there are fewer applications.
  • the main purpose of the utility model is to provide an LED constant current driving circuit, which can reduce the cost and improve the performance.
  • the utility model provides an LED constant current driving circuit, comprising: a transistor DC amplifier and a current sensor;
  • the transistor DC amplifier output current drives an LED load
  • the current sensor is connected in a current loop of the transistor DC amplifier and the LED load, the control terminal of the current sensor is connected to the input end of the transistor DC amplifier, and the output current of the transistor DC amplifier is controlled by the current sensor to make the transistor DC amplifier output The current is stable within the set range.
  • the transistor DC amplifier comprises a transistor T1 and a resistor R1; the current sensor comprises a transistor T2 and a resistor R2.
  • the transistor T1 or the transistor T2 is one of a PNP transistor, an NPN transistor, a MOS field effect transistor, a Darlington transistor or a multi-level composite transistor.
  • the transistor DC amplifier comprises one or more transistors T1.
  • the current sensor comprises one or more transistors T2.
  • the LED constant current driving circuit can be connected to the LED load as a 2-terminal structure; or connected to the LED load as a 3-terminal structure.
  • the LED constant current driving circuit can be set to be used in combination.
  • the LED constant current driving circuit is connected to a DC power source; or is connected to an AC power source through a rectifier; the rectifier is a general-purpose half-wave, full-wave or bridge rectifier.
  • the LED constant current drive circuit is packaged on a general integrated circuit carrier or housing to form an integrated circuit.
  • the LED constant current driving circuit is packaged together with a rectifier to form an integrated circuit module of AC input and DC output.
  • the LED constant current driving circuit of the utility model is composed of a transistor DC amplifier and a current sensor, and has a simple circuit structure and low cost; small volume, high efficiency, small reactive loss, and a power factor of up to 0.95 or more; no EMI in the circuit (Electromagnetic radiation), its conversion efficiency, PF (power factor) value and other important indicators can meet the requirements of the European Union and the United States Energy Star.
  • the circuit also supports the current popular thyristor phase dimming. The thyristor dimmer can be used to dim the LED lamp driven by the circuit, and the dimming performance is stable, and the light output is linear.
  • FIG. 1 is a schematic view showing the overall structure of an LED load constant-connecting circuit of the present invention connected to an LED load;
  • 2A is a schematic diagram showing the circuit structure of a transistor DC amplifier in an embodiment of the LED constant current driving circuit of the present invention
  • 2B is a schematic diagram showing the circuit structure of a current sensor in an embodiment of the LED constant current driving circuit of the present invention
  • 2C is a schematic structural view of an overall circuit in an embodiment of the LED constant current driving circuit of the present invention.
  • Figures 3A to 3C It is a schematic structural diagram of a plurality of transistors T1 and/or transistors T2 in an embodiment of the LED constant current driving circuit of the present invention
  • FIGS. 4A to 4C are schematic diagrams showing three structures in series with an LED load in an embodiment of the LED constant current driving circuit of the present invention.
  • FIG. 5 is a schematic structural view showing a parallel connection of a plurality of LED constant current driving circuits in an embodiment of the LED constant current driving circuit of the present invention
  • FIG. 6 is a schematic structural view showing a series connection of a plurality of LED constant current driving circuits in an embodiment of the LED constant current driving circuit of the present invention.
  • an LED constant current driving circuit includes: a transistor DC amplifier 21 and a current sensor 22;
  • the transistor DC amplifier 21 output current drives the LED load 10;
  • the current sensor 22 is serially connected to the current loop of the transistor DC amplifier 21 and the LED load 10.
  • the control terminal 3 of the current sensor 22 is connected to the input terminal 3 of the transistor DC amplifier 21, and the output current of the transistor DC amplifier 21 is controlled by current sensing.
  • the device 22 stabilizes the current output from the transistor DC amplifier 21 within a set range.
  • the LED load 10 can be an LED light string, and the LED light string can include several LED lights.
  • the total voltage after the series connection of LED lamps is the product of the characteristic voltage (VF) of a single LED lamp and the number of LED lamps.
  • VF characteristic voltage
  • the number of strings should be designed according to the power supply voltage, and the voltage of the string should be slightly lower.
  • the DC voltage in the power supply circuit is generally suitable for a voltage of 3-50V lower than the power supply voltage in the circuit. If the voltage difference is too large, the efficiency will decrease.
  • the magnitude of the output current is set according to the needs of the LED load. Changing the values of R1 and R2 changes the magnitude of the output current.
  • the current sensor 22 is connected to the input terminal 3 of the transistor DC amplifier 21 through its control terminal 3, and controls the current output from the transistor DC amplifier 21 to the LED load 10 so that the current is in a constant current state.
  • the LED constant current driving circuit can be realized, and the circuit structure is simple, the cost is low, the volume is small, the efficiency is high, and the reactive power loss is small.
  • the transistor DC amplifier 21 includes a transistor T1 and a resistor R1; the current sensor 22 includes a transistor T2 and a resistor R2.
  • the LED constant current driving circuit can be composed of a transistor T1, a transistor T2, a resistor R1 and a resistor R2.
  • the transistors T1 and T2 are respectively ordinary NPN transistors, and the base B of the transistor T1 is connected in series with the resistor R1 and then connected to the collector C of the transistor T1 as the input end of the driving circuit; the collector C of the transistor T2 and the transistor T1
  • the base B is connected, the base B of the transistor T2 is connected to the emitter E of the transistor T1, the resistor R2 is connected between the emitter E of the transistor T1 and the emitter E of the transistor T2, and the emitter E of the transistor T2 is output as a driving circuit. end.
  • transistor T1 and resistor R1 form a typical DC amplifier, and Vcc (V+) voltage is added to the base B of T1 through resistor R1, which provides T1.
  • a base current (IB) according to the amplification principle of the transistor, its collector C produces an amplified collector current (IC), and flows through the emitter E and the resistor R2 to the negative terminal V- of the power supply, at R2.
  • the two ends will generate a voltage, and this voltage is directly applied between the base B and the emitter E of the transistor T2, and is amplified by the transistor T2. At this time, the potential of the collector C of the transistor T2 will increase with the current.
  • the potential of the base B of the transistor T1 is lowered, so that the current of the base B of the transistor T1 is reduced to pin the output current of the transistor T1.
  • the output current of the transistor T1 is kept constant within a certain range. Appropriate selection of the resistance of resistor R2 can control the output current within the set range.
  • the LED constant current driving circuit can be connected to the LED load 10 through the output end as a 2-terminal passive structure, or can be connected to the LED load 10 through the output end as a 3-terminal active structure.
  • the above LED constant current driving circuit can be connected to any DC power source; or can be connected to an AC power source through a rectifier.
  • the rectifier described above is a general-purpose half-wave, full-wave or bridge rectifier.
  • the above LED constant current driving circuit is suitable for driving a string of 50-80 low-power LED lamps, suitable for 3-5W LED energy-saving lamps or LED bulbs, and its power factor is greater than 0, 95. , work efficiency is greater than 90%.
  • the AC mains is AC110V
  • this circuit is suitable for driving strings of 20-40 low-power LED lights.
  • the transistor DC amplifier 21 described above may include one or more transistors T1; the current sensor 22 may also include one or more transistors T2.
  • the transistor T1 or the transistor T2 is one of a PNP transistor, an NPN transistor, a MOS field effect transistor, a Darlington transistor, or a multi-level composite transistor.
  • the transistor T1 and the transistor T2 are respectively ordinary NPN transistors; the transistor T1 in FIG. 3C is an N-channel field effect transistor, and the two transistors T2 are ordinary NPN type transistors or single Darlington transistors;
  • the gate G of T1 is connected in series with the resistor R1 and then connected to the drain D as the input terminal of the LED constant current driving circuit; the collector C of one transistor T2 is connected to the gate G of the transistor T1, and the base B of the other transistor T2 is connected.
  • the resistor R2 is connected between the source S of the transistor T1 and the emitter E of the transistor T2, and the emitter E of the transistor T2 serves as the output of the driver circuit.
  • the LED load 10 described above may be connected in series throughout the LED constant current drive circuit.
  • the above-described LED constant current driving circuit can be used in combination.
  • the plurality of LED constant current driving circuits may be connected in parallel (Fig. 5) or in series (Fig. 6), and the LED load 10 is connected in series with the combined circuit.
  • the LED constant current driving circuit is packaged on a general-purpose integrated circuit holder or housing to form an integrated circuit.
  • the LED constant current driving circuit is packaged together with the rectifier to form an integrated circuit module of AC input and DC output.
  • the LED constant current driving circuit is composed of a transistor DC amplifier 21 and a current sensor 22, and has a simple circuit structure and low cost; small volume, high efficiency, low reactive power loss, and a power factor of up to 0.95 or more; no EMI in the circuit (Electromagnetic radiation), its conversion efficiency, PF (power factor) value and other important indicators can meet the requirements of the European Union and the United States Energy Star.
  • the circuit also supports the current popular thyristor phase dimming. The thyristor dimmer can be used to dim the LED lamp driven by the circuit, and the dimming performance is stable, and the light output is linear.

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

Description

LED恒流驱动电路
技术领域
本实用新型涉及到恒流驱动电路，特别是涉及到一种LED恒流驱动电路。
背景技术
LED（Light Emitting Diode，发光二极管）照明时代已经到来，作为新一代的绿色光源，未来将逐步顶替传统光源而进入千家万户。
然而，LED是一款工作在低电压、直流的半导体器件，需要在恒定的电流环境下工作，对于普通市电，必须经过电压转换和恒流控制以后，才能够提供给LED使用，完成上述过程的电路或设备通常被称之为LED驱动器或驱动电路。目前，普遍应用的驱动方案有：开关型恒流驱动、阻容降压式驱动和线性恒流驱动。
开关型恒流驱动具有转换效率及恒流精度高等优点而被广泛应用，但其缺点是电路复杂，造价高，而且由于采用了高频振荡电路，工作时会对周边环境及电网产生一定的电磁辐射，在大量集中使用时，上述问题尤为明显。如果处理不当，将会对周边的电器设备产生干扰，甚至对电网产生污染。
阻容降压式驱动是采用电容器对交流电进行降压及限流，经整流器整流以后提供给LED使用，其特点是造价低廉，目前也被大量用在低端廉价市场，阻容降压的致命缺点是效率低，电路中的无功损耗大，其功率因数仅为0.2-0.6左右，根据美国“能源之星”以及欧盟的相关规定，家庭照明设备的PF值（功率因数）应大于0.7，而商业照明的PF值应大于0.9，显然，使用阻容降压的灯具不适合出口。另外，降压电容在刚刚上电的一瞬间，其内阻很小，故，上电的瞬间对负载的冲击电流相当大，会大大缩短LED的使用寿命。
线性恒流驱动，通常被用在低压、直流的环境下（如12-24V），如果在220V（或110V）市电上使用，则必须先用开关电源或变压器将高压变换为合适的电压以后再进行恒流控制。其缺点是造价高、效率低，因此，应用的较少。
如何用较低的成本，打造出高性能的LED恒流驱动器，成为本领域人员亟待解决的问题。
发明内容
本实用新型的主要目的为提供LED恒流驱动电路，可降低成本，提高了性能。
本实用新型提出一种LED恒流驱动电路，包括：晶体管DC放大器与电流感知器；
所述晶体管DC放大器输出电流驱动LED负载；
所述电流感知器串入晶体管DC放大器与LED负载的电流回路中，电流感知器的控制端连接到晶体管DC放大器的输入端，晶体管DC放大器输出电流受控于电流感知器，使晶体管DC放大器输出的电流稳定在设定范围内。
优选地，所述晶体管DC放大器包括晶体管T1与电阻R1；所述电流感知器包括晶体管T2和电阻R2。
优选地，晶体管T1或晶体管T2为PNP晶体管、NPN晶体管、MOS场效应管、达林顿管或多级复合晶体管中的其中之一。
优选地，所述晶体管DC放大器包括一个或多个晶体管T1。
优选地，所述电流感知器包括一个或多个晶体管T2。
优选地，所述LED恒流驱动电路电路可作为2端结构与LED负载连接；或者，作为3端结构与LED负载连接。
优选地，所述LED恒流驱动电路可以设置多个合并使用。
优选地，所述LED恒流驱动电路与直流电源连接；或者，通过整流器与交流电源连接；所述整流器为通用的半波、全波或桥式整流器。
优选地，所述LED恒流驱动电路封装在通用的集成电路支架或外壳上，以形成集成电路。
优选地，所述LED恒流驱动电路连同整流器一并封装，形成AC输入，DC输出的集成电路模块。
本实用新型LED恒流驱动电路，由晶体管DC放大器与电流感知器构成，其电路结构简单，造价低廉；体积小，效率高，无功损耗小，功率因数最高时达0.95以上；电路中无EMI（电磁辐射），其转换效率、PF（功率因数）值等重要指标均能够达到欧盟及美国能源之星的相关要求。此外，本电路还支持目前国外流行的可控硅相位调光，可用可控硅调光器对本电路驱动的LED灯实施调光，其调光性能稳定，光输出线性良好。
附图说明
图1 是本实用新型LED恒流驱动电路一实施例中与LED负载连接的整体结构示意图；
图2A 是本实用新型LED恒流驱动电路一实施例中晶体管DC放大器的电路结构示意图；
图2B 是本实用新型LED恒流驱动电路一实施例中电流感知器的电路结构示意图；
图2C 是本实用新型LED恒流驱动电路一实施例中整体电路的结构示意图；
图3A至3C 是本实用新型LED恒流驱动电路一实施例中包含多个晶体管T1和/或晶体管T2的结构示意图；
图4A至4C 是本实用新型LED恒流驱动电路一实施例中与LED负载串联的三种结构示意图；
图5 是本实用新型LED恒流驱动电路一实施例中多个LED恒流驱动电路并联的结构示意图；
图6 是本实用新型LED恒流驱动电路一实施例中多个LED恒流驱动电路串联的结构示意图。
本实用新型目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。
参照图1，提出本实用新型一实施例的一种LED恒流驱动电路，包括：晶体管DC放大器21与电流感知器22；
上述晶体管DC放大器21输出电流驱动LED负载10；
上述电流感知器22串入晶体管DC放大器21与LED负载10的电流回路中，电流感知器22的控制端3连接到晶体管DC放大器21的输入端3，晶体管DC放大器21输出电流受控于电流感知器22，使晶体管DC放大器21输出的电流稳定在设定范围内。
上述LED负载10可为LED灯串，该LED灯串中可包括若干个LED灯。LED灯的串连后的总电压是单个LED灯的特性电压（VF）与LED灯的数量的乘积，实际应用时，应根据电源电压来设计灯串的数量，灯串的电压应稍低于供电电路中的DC电压，一般来说，灯串的电压比电路中的供电电压低3-50v较为合适，如果电压差距太大，其效率将有所下降。输出电流的大小则根据LED负载的需要来设定，改变R1和R2的值即可改变输出电流的大小。
上述电流感知器22通过其控制端3与晶体管DC放大器21的输入端3连接，控制该晶体管DC放大器21输出给LED负载10的电流，使该电流处于恒流状态。如此，可使上述LED恒流驱动电路，达到电路结构简单，造价低廉，体积小，效率高以及无功损耗小等目的。
参照图2A、2B以及2C，上述晶体管DC放大器21包括晶体管T1与电阻R1；上述电流感知器22包括晶体管T2和电阻R2。
由此，上述LED恒流驱动电路，可由晶体管T1、晶体管T2、电阻R1和电阻R2连接组成。设上述晶体管T1以及T2分别为普通NPN型三极管，晶体管T1的基极B串接电阻R1后与晶体管T1的集电极C并接后作为驱动电路输入端；晶体管T2的集电极C与晶体管T1的基极B连接，晶体管T2的基极B与晶体管T1的发射极E连接，电阻R2连接在晶体管T1的发射极E与晶体管T2的发射极E之间，晶体管T2的发射极E作为驱动电路输出端。
上述LED恒流驱动电路的工作原理（参照图2C）：晶体管T1和电阻R1构成一个典型的DC放大器，Vcc（图中的V+）电压通过电阻R1加入到T1的基极B，为T1提供了一个基极电流（IB），根据晶体管的放大原理，其集电极C就产生了一个经过放大了的集电极电流（IC），并通过发射极E、电阻R2流向电源的负极V-，在R2的两端将产生一个电压，而这个电压被直接加载于晶体管T2的基极B与发射极E之间，并被晶体管T2放大，此时，晶体管T2集电极C的电位将随着其电流增大而下降，也同时拉低了晶体管T1的基极B的电位，使晶体管T1的基极B的电流减少而牵制了晶体管T1的输出电流。根据V=I*R的公式，当通过电阻R2的电流减少时，在电阻R2两端所产生的电压值也相应减少，同时，晶体管T2的集电极C的电位也因电流下降而上升，晶体管T1的输出电流值也因此而相应上升。如此循环，晶体管T1的输出电流就恒定在一定的范围之内。适当的选择电阻R2的阻值，可将输出电流控制在设定范围内。
上述LED恒流驱动电路可作为2端无源结构，通过输出端与LED负载10连接；或者，也可作为3端有源结构，通过输出端与LED负载10连接。
上述LED恒流驱动电路可与任意直流电源连接；或者，可通过整流器与交流电源连接。上述整流器为通用的半波、全波或桥式整流器。当交流市电为AC220V时，上述LED恒流驱动电路适用于驱动50-80个小功率LED灯组成的灯串，适合3-5W的LED节能灯或LED灯泡使用，其功率因数大于0、95，工作效率大于90%。当交流市电为AC110V时，本电路适用于驱动20-40个小功率LED灯组成的灯串。
参照图3A、3B以及3C，上述晶体管DC放大器21可包括一个或多个晶体管T1；上述电流感知器22也可包括一个或多个晶体管T2。上述晶体管T1或晶体管T2为PNP晶体管、NPN晶体管、MOS场效应管、达林顿管或多级复合晶体管中的其中之一。
图3A以及3B中，该晶体管T1以及晶体管T2分别为普通的NPN晶体管；图3C中的晶体管T1为N沟道场效应管，两个晶体管T2为普通NPN型三极管或单个的达林顿晶体管；晶体管T1的栅极G串接电阻R1后与漏极D并接后作为LED恒流驱动电路输入端；一晶体管T2的集电极C与晶体管T1的栅极G连接，另一晶体管T2的基极B与晶体管T1的源极S连接，电阻R2连接在晶体管T1的源极S与该一晶体管T2的发射极E之间，该一晶体管T2的发射极E作为驱动电路输出端。
参照图4A、4B以及4C，上述LED负载10可串联在上述LED恒流驱动电路中的各处。
参照图5以及6，上述LED恒流驱动电路可以设置多个合并使用。上述多个LED恒流驱动电路可并联（图5）或串联（图6）连接，上述LED负载10与合并后的电路串联。
上述LED恒流驱动电路封装在通用的集成电路支架或外壳上，以形成集成电路。在上述恒流驱动电路连接有整流器时，上述LED恒流驱动电路连同整流器一并封装，形成AC输入，DC输出的集成电路模块。
上述LED恒流驱动电路，由晶体管DC放大器21与电流感知器22构成，其电路结构简单，造价低廉；体积小，效率高，无功损耗小，功率因数最高时达0.95以上；电路中无EMI（电磁辐射），其转换效率、PF（功率因数）值等重要指标均能够达到欧盟及美国能源之星的相关要求。此外，本电路还支持目前国外流行的可控硅相位调光，可用可控硅调光器对本电路驱动的LED灯实施调光，其调光性能稳定，光输出线性良好。
以上所述仅为本实用新型的优选实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本实用新型的专利保护范围内。

Claims (10)

  1. 一种LED恒流驱动电路，其特征在于，包括：晶体管DC放大器与电流感知器；
    所述晶体管DC放大器输出电流驱动LED负载；
    所述电流感知器串入晶体管DC放大器与LED负载的电流回路中，电流感知器的控制端连接到晶体管DC放大器的输入端，晶体管DC放大器输出电流受控于电流感知器，使晶体管DC放大器输出的电流稳定在设定范围内。
  2. 根据权利要求1所述的LED恒流驱动电路，其特征在于，所述晶体管DC放大器包括晶体管T1与电阻R1；所述电流感知器包括晶体管T2和电阻R2。
  3. 根据权利要求2所述LED恒流电路，其特征在于：晶体管T1或晶体管T2为PNP晶体管、NPN晶体管、MOS场效应管、达林顿管或多级复合晶体管中的其中之一。
  4. 根据权利要求2所述LED恒流驱动电路，其特征在于，所述晶体管DC放大器包括一个或多个晶体管T1。
  5. 根据权利要求2所述LED恒流驱动电路，其特征在于，所述电流感知器包括一个或多个晶体管T2。
  6. 根据权利要求1所述LED恒流驱动电路，其特征在于，所述LED恒流驱动电路作为2端结构与LED负载连接；或者，作为3端结构与LED负载连接。
  7. 根据权利要求1所述的LED恒流驱动电路，其特征在于，所述LED恒流驱动电路可以设置多个合并使用。
  8. 根据权利要求1-7所述的LED恒流驱动电路，其特征在于，所述LED恒流驱动电路与直流电源连接；或者，通过整流器与交流电源连接；所述整流器为通用的半波、全波或桥式整流器。
  9. 根据权利要求1-7所述的LED恒流驱动电路，其特征在于，所述LED恒流驱动电路封装在通用的集成电路支架或外壳上，以形成集成电路。
  10. 根据权利要求8所述的LED恒流驱动电路，其特征在于，所述LED恒流驱动电路连同整流器一并封装，形成AC输入，DC输出的集成电路模块。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103152895A (zh) * 2013-03-26 2013-06-12 青海聚能达新能源开发有限公司 一种用交流电直接驱动led的电路

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102695336A (zh) * 2012-05-22 2012-09-26 曹勇 一种led灯具
CN103582228B (zh) * 2012-08-12 2015-05-20 王济生 5瓦led环保节能灯稳流电路
CN103269540B (zh) * 2013-05-07 2014-12-10 木林森股份有限公司 双路互补线性led恒流电路
CN106604481B (zh) * 2017-02-20 2018-04-13 王汉忠 一种led线性恒流软启动驱动电路

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2829279Y (zh) * 2005-11-02 2006-10-18 周志邦 全彩led变色驱动电路
CN201450639U (zh) * 2009-07-08 2010-05-05 华南理工大学 节省电路资源的高可靠的led恒流驱动电路

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2829279Y (zh) * 2005-11-02 2006-10-18 周志邦 全彩led变色驱动电路
CN201450639U (zh) * 2009-07-08 2010-05-05 华南理工大学 节省电路资源的高可靠的led恒流驱动电路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103152895A (zh) * 2013-03-26 2013-06-12 青海聚能达新能源开发有限公司 一种用交流电直接驱动led的电路

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