Integrated LED driving power supply compatible with electronic transformer

Abstract

The invention discloses an integrated LED driving power supply compatible with an electronic transformer; the integrated LED driving power supply comprises an electronic transformer and a rectifier bridge; the output end of the electronic transformer is connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with an input filter capacitor C1 inparallel; the integrated LED driving power supply further comprises a front-stage PFC converter and a 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 integrated through a single switching tube S1, wherein a direct-current component and an alternating-current component of transient input power are decoupled by a decoupling capacitor Cd therebetween; the alternating current component is stored in the decoupling capacitor Cd; and the direct current component passes through the rear-stage DC-DC converter to output a stable a direct current output voltage which does not comprise two-time power frequency ripples. By virtue of the integratedLED driving power supply, the problem of capacitive load is solved, direct-current voltage ripples of the front-stage output are eliminated, and the problem that a single-stage PFC scheme output comprises two-time power frequency ripples is solved; and in addition, the integrated LED driving power supply has the characteristics of being small in circuit size and low in cost, and can better satisfythe requirements of an MR16 illuminating system.

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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