Capacitor isolated type multipath constant current output resonant mode DC/DC transformer

Abstract

The invention relates to a transformer used for realizing balanced current output among multipath outputs, aiming at providing a capacitor isolated type multipath constant current output resonant mode DC / DC transformer. The transformer comprises a DC input, a primary-side topology comprising a plurality of switches, a secondary-side rectifier, and a resonance network comprising two resonance circuit branches, wherein each resonance circuit branch respectively comprises one resonance capacitor and one resonance inductor which are connected in series, and each resonance circuit branch is connected between one output end of the primary-side topology and one input end of the secondary-side rectifier. In the invention, a traditional isolated transformer is omitted, therefore, the circuit structure is simplified, the cost is reduced, and simple and efficient multipath constant source outputs are realized; and the invention is particularly suitable for the driving of multi-series LEDs.

Description

technical field [0001] The invention relates to a multi-output DC / DC resonant converter based on capacitive isolation, which realizes current balanced output between multiple outputs. In particular, it refers to the resonant capacitor based on the resonant circuit to achieve output current balance and isolation of input and output at the same time. Background technique [0002] At present, with the development of LED technology, LED lighting is a green and environmentally friendly lighting solution, which has incomparable advantages compared with traditional lighting solutions. However, the power of a single high-brightness LED light source is often limited by packaging, heat generation, etc., and the general power is maintained at 1W-3W. In occasions that require high-power and high-brightness lighting, such as street lights and square lighting, it is usually necessary to combine many LEDs for use. The brightness of an LED is directly related to the current flowing throug...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems of high cost, low efficiency, and large volume of multi-channel constant current output, and propose a circuit based on a series resonant converter, without adding additional components to the circuit, using The resonant capacitor of the resonant circuit realizes multi-channel constant current output, safety isolation (safety isolation without transformer method) and high-precision current balance, which can realize low cost, high efficiency, and thin driver, etc., especially suitable for multi-string LEDs drive

Images