High-power-factor LED (Light Emitting Diode) constant-current driving power supply without electrolytic capacitor

Abstract

The invention discloses a high-power-factor LED (Light Emitting Diode) constant-current driving power supply without an electrolytic capacitor. The high-power-factor LED constant-current driving power supply comprises an alternating-current input power supply vin, a bridge rectifying circuit, a main switch tube, an energy storing capacitor, a freewheel diode, an auxiliary circuit, a transformer, a rectifying circuit and a filter capacitor. The high-power-factor LED constant-current driving power supply is mainly technically characterized in that: a flyback converter topology is adopted, and working in a discontinuous current mode is performed, so that power factor calibration is realized automatically, and a high input power factor is obtained; and meanwhile, the energy storing capacitor is arranged in a main circuit, redundant energy is stored in the energy storing capacitor when the input power pin is higher than output power Po, and insufficient energy is provided by the energy storing capacitor when the input power pin is lower than output power Po, so that constant working current can be provided for an LED. Meanwhile, voltage pulsation on the energy storing capacitor is high, and the capacitance values of a needed energy storing capacitor and filter capacitor are low, so that other types of capacitors of non-electrolytic-capacitor type such as ceramic capacitors and the like can be adopted.

Description

technical field [0001] The invention relates to a high power factor LED constant current drive power supply without an electrolytic capacitor, and belongs to the technical field of AC-DC converters in electric energy conversion devices. Background technique [0002] Light emitting diode (Light Emitting Diode, LED) has become a new generation of green lighting source due to its energy saving, environmental protection, high efficiency, long life and many other advantages. With the maturity of LED lighting technology, it will be widely used in various fields and become the first choice of lighting source. Manufacturing high-efficiency, high-power-factor, and long-life drive power supplies is the key to ensuring LED luminous quality and overall performance. In daily lighting occasions with mains input, it is often used figure 1 The drive power architecture shown is divided into two parts, the adapter and the driver. The function of the adapter is to implement input power fact...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to overcome the serious defect that the above-mentioned two-stage LED drive power supply cannot match the long life of the LED due to the use of electrolytic capacitors, the present invention provides a high input power factor that does not use electrolytic capacitors and automatically implements power factor correction. High power factor LED constant current driver without electrolytic capacitor

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