Light-emitting diode light source driving power supply

Abstract

The invention discloses a light-emitting diode light source driving power supply, comprising an EMI (electro magnetic interference) input suppression circuit, an input rectification filter circuit, a PFC (power factor correction) and direct current switching circuit, an IC (integrated circuit) auxiliary power supply circuit, an output rectification filtering unit and a constant voltage and constant current output feedback control circuit, wherein the EMI input suppression circuit is composed of CX1, L1, CX2 and L2, and an output electric signal after power grid clutter filtering is connected to the input rectification filter circuit to be rectified and to be filtered by C1; and direct current after rectification filtering is connected to an isolation transformer, then the direct current is connected to V1 in the PFC and direct current switching circuit and is also connected to the IC auxiliary power supply circuit, and then the direct current is coupled to a secondary line set by virtue of the isolation transformer to be subject to rectification filtering and finally is connected to a power grid power factor correction chip IC1 in the PFC and direct current switching circuit, so as to supply power to the IC1. The invention has good load adaptability; the transformation efficiency is high; and an LED driving power supply with constant current and output voltage regulated along with load change is realized.

Description

technical field [0001] The invention relates to a light-emitting diode light source driving power applied to high-power semiconductors. Background technique [0002] With the extensive use of high-power semiconductor light-emitting diode (LED) light source, its energy-saving, environmental protection, high luminous efficiency, and long-life new lighting source have caused global environmental pollution and the depletion of non-renewable energy. At the same time, high-efficiency, energy-saving, and environmentally friendly LED light sources are also widely used in various fields of real life, and various lighting companies are competing to develop such products. The light source and driving power, due to the special driving mode of the semiconductor light-emitting diode, have strict requirements on its power drive, and the quality of its power directly affects the energy-saving effect and service life of the LED. [0003] The quality of the driving power directly determines ...

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Problems solved by technology

[0003] The quality of the driving power directly determines the effect of using LEDs. Due to the rapid development of the LED market in recent years and the lack of special compulsory testing standards for this type of power supply in the world, the quality of this type of power supply varies, and the use of low-quality power supplies It leads to serious light decay and shortened lifespan of LEDs, causing LEDs to lose their real use value, forming a situation of "energy saving but not money saving"

At present, there are many LED driving power products, most of which are mainly based on IC control. Many IC companies at home and abroad have successively launched various IC circuits for driving power, most of which are economical and practical to compete for the market. Constant current type, constant voltage and constant current hybrid type, low power factor PF: about 0.4-0.6, high harmonic content THD: greater than 100, this kind of power supply has great interference to the power grid, the output current is not clean, and the current ripple is relatively large. High, voltage, and current constant effects are poor, so that the LED work can not reach the ideal state. In order to overcome these problems, some better companies load the power factor correction circuit, and the output uses IC detection to control the constant output voltage and current to achieve ideal work. Conditions, but this kind of power supply is designed to be expensive and not easy to use in large quantities

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