An integrated LED drive power supply compatible with electronic transformers

Abstract

The invention discloses an integrated LED drive power supply compatible with an electronic transformer, which includes an electronic transformer and a rectifier bridge. 1 , also includes the front-stage PFC converter and the rear-stage DC-DC converter; the input end of the front-stage PFC converter is connected to the output end of the rectifier bridge, and the front-stage PFC converter and the rear-stage DC-DC converter are connected through a single switch Tube S 1 integrated, the decoupling capacitor C between d Decouple the DC component and the AC component of the transient input power, and store the AC component in the decoupling capacitor C d Among them, the DC component outputs a DC output voltage that is stable and does not contain twice the power frequency ripple through the subsequent DC-DC converter. The invention solves the capacitive load problem, eliminates the DC voltage ripple output by the previous stage, and solves the problem that the output of the single-stage PFC scheme contains twice the power frequency ripple; and has the characteristics of small circuit size and low cost, and is more in line with MR16 lighting system requirements.

Description

technical field [0001] The invention relates to the technical field of LED driving power supply, in particular to an integrated LED driving power supply compatible with electronic transformers. Background technique [0002] The emergence of LED is considered to be the second revolution in the history of lighting development in the past 120 years. It is a major breakthrough in human green technology. The development trend of lamps and lanterns. [0003] The traditional MR16 halogen lamp lighting system mainly includes an electronic transformer and a halogen lamp. The high-frequency step-down electronic transformer converts the grid AC voltage into 12Vac high-frequency AC output for the halogen lamp. Under the condition of the same luminous flux, if the halogen lamp in the MR16 lighting system is replaced by an LED with a driving power supply, the halogen lamp with a power of 20-60W only needs to be replaced by a 3-7W LED, which greatly reduces the cost of the MR16 lighting s...

AI Technical Summary

Problems solved by technology

[0013] In view of the above problems, the purpose of the present invention is to provide an integrated LED drive power supply compatible with electronic transformers, which can solve the problem of capacitive load in traditional compatible methods, and the problem of double power frequency ripple in the output of single-stage PFC schemes, and The circuit is small in size and low in cost, which is more in line with the requirements of MR16 lighting system

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