Light-emitting diode (LED) driving power supply

Abstract

The invention relates to the light-emitting diode (LED) manufacturing field and provides a LED driving power supply. The LED driving power supply comprises a power input end, an electro magnetic compatibility (EMC) circuit, a rectifying circuit, a voltage conditioning circuit, a filtering circuit, an output current voltage detecting circuit and an LED lamp at the output end of the output current voltage detecting circuit, and further comprises a constant current and constant voltage controlling circuit, wherein the power input end, the EMC circuit, the rectifying circuit, the voltage conditioning circuit, the filtering circuit, the output current voltage detecting circuit and the LED lamp are connected in sequence, the constant current and constant voltage controlling circuit is connected with an output end of the output current voltage detecting circuit and an input end of the voltage conditioning circuit, an inductance and a piezoresistor are arranged between the rectifying circuit and the voltage conditioning circuit, the inductance is connected with the rectifying circuit and the voltage conditioning circuit in series, the piezoresistor is connected with the rectifying circuit and the voltage conditioning circuit in parallel, and the input end of the piezoresistor is connected with the output end of the inductance. The LED driving power supply has the advantages that elements with big sizes, high failure rates and high prices are greatly reduced, the structure is simple and reasonable, the cost is lowered and application is stable and reliable. The inductance is added between the rectifying circuit and the voltage conditioning circuit, so that undesirable effects due to the fact that different-mode signals transit to a power grid are restrained, meanwhile the piezoresistor is added, and thereby the ability of the power supply to reject outside surge is improved.

Description

technical field [0001] The invention relates to the field of LED manufacturing, and more specifically relates to a stable and reliable LED driving power supply with simple and reasonable structure, reduced cost. Background technique [0002] LED, light-emitting diode, is a semiconductor component that can convert electrical energy into light energy. It has the advantages of small size, low power consumption, long service life, environmental protection and durability, and is widely used in lighting fixtures, display screens, traffic lights, etc. field. [0003] Since the LED is a semiconductor device with sensitive characteristics and has negative temperature characteristics, it needs to be in a stable working state and protected during the application process, thus requiring an LED drive power supply. LEDs have very strict requirements on driving power, unlike ordinary incandescent bulbs, which can be directly connected to 220V AC mains. LED is driven by a low voltage of 2...

AI Technical Summary

Problems solved by technology

[0005] This traditional high-power LED drive power supply is relatively complex, and some of its components have the disadvantages of large volume, high power, high cost, and high failure rate, such as high-power MOS tubes, high-frequency transformers, recovery diodes, electrolytic capacitors, etc., making The entire circuit consumes a lot of energy, has low work efficiency, and at the same time has a high overall cost and lacks stability and reliability in use.

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