LED alternating current (AC) directly-powered circuit and power supply method
A technology of power supply circuit and current limiting circuit, which is applied in the field of power supply circuit of LED light source, can solve the problems of low power conversion efficiency, low power factor of power supply, limited life of power supply, etc.
Inactive Publication Date: 2010-05-19
陕西西电科大华成电子股份有限公司
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[0004] In order to overcome the shortcomings of the prior art such as limited power supply life, low power factor, low power conversion efficiency, and large volume, the present invention provides an LED AC direct power supply circuit, which can prolong the service life of the power supply, improve power supply efficiency, and reduce the volume of the power supply, etc. Effect
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[0021] Device embodiment: refer to figure 2 , the whole LED light string is divided into three sections, the input 50Hz sine wave AC is rectified by the rectifier bridge, and the voltage waveform is 100Hz full wave, which is added to both ends of the circuit formed by the LED light string and the current limiting circuit in series. The maximum operating current of the flow circuit is less than or equal to the maximum operating current of the LED. The voltage divider circuit is connected in parallel with the LED light string, and the voltage detection points are respectively set at 1 / 3 and 2 / 3 of the input rated voltage, that is, the voltage divider circuit is composed of 4 resistors, and the resistors R1 and R2 are connected in series as a group , the resistance ratio of resistors R1 and R2 is 1:3; the resistors R3 and R4 are connected in series as a group, and the resistance ratio of resistors R3 and R4 is 2:3; two groups of series resistors are connected in parallel to form...
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The invention discloses an LED alternating current (AC) directly-powered circuit and a power supply method. The method comprises the following steps of: rectifying the input sine wave alternating current of 50Hz into full wave of 100Hz, and adding to both ends of a circuit formed by in-series connection of LED lamp strings and current foldback circuits; dividing the LED lamp strings into n+1 sections; equally dividing the voltage peak of the full wave into n+1 portions by using a voltage division circuit, connecting the base electrode or the grid electrode of an electronic switch with the output end of the voltage division circuit, connecting the collector electrode or the drain electrode of the electronic switch with each lamp string, and connecting the emitting electrode or the source electrode of the electronic switch with the crossing points of the lamp strings and the current foldback circuits. The ON / OFF of each LED is controlled by the ON / OFF of the electronic switch. The service life of the invention is much longer than that of traditional LED driving powers, the conversion efficiency of the power reaches 97%, the power factor is as high as 0.95, and the volume and the weight of the invention are far less than those of the traditional LED driving powers.
Description
technical field [0001] The invention relates to the field of circuit design, in particular to a power supply circuit of an LED light source and a power supply method thereof. Background technique [0002] Light-emitting diode (LED) solid-state light source has the advantages of high luminous efficiency, environmental protection, and long life, and is known as the fifth-generation lighting source. At present, the luminous efficiency of LED can reach 186lm / W. [0003] Since the LED has the characteristic that it can only be forward-conducting, the existing LED lights need to be powered by an AC / DC power converter to convert the alternating current into direct current, which requires the use of energy storage components such as capacitors, and the life of the capacitor is limited. In addition, due to the need to use large-volume components such as capacitors and transformers, the size of the power supply required for LED lamps is not easy to reduce, and the power factor and p...
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IPC IPC(8): H05B37/00H02M7/08
CPCY02B20/42Y02B20/40
Inventor 涂重阳白占军魏栓正
Owner 陕西西电科大华成电子股份有限公司