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

A capacitive isolation and constant current output technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and lighting circuit layout, can solve the problems of large volume, low efficiency, and high cost of multiple constant current outputs. To achieve the effect of simplifying the circuit structure, reducing the cost, simple and efficient multi-channel constant current source output

Active Publication Date: 2011-01-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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specific Embodiment approach

[0043] The primary side of the circuit 100 is a half-bridge structure, and the secondary-side rectifier is also a full-bridge structure. The specific implementation is as follows: the first terminal of the first resonant inductor Lr1 of the circuit 100 is directly coupled to the output terminal of the primary topology, that is, the series coupling point of the first transistor Q1 and the second transistor Q2, and its second terminal is coupled to The first end of the first resonant capacitor Cr1. The second terminal of the first resonant capacitor Cr1 is coupled to the coupling point of the anode of the first diode Dr1 and the cathode of the fourth diode Dr4 of the full bridge structure, and the cathode of the first diode Dr1 serves as an output terminal. The first end of the second resonant inductor Lr2 is connected to the coupling point between the negative pole of the power input and the S pole of the lower transistor Q2, and the second end is connected to the first end of ...

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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...

Claims

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Application Information

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IPC IPC(8): H02M3/338H05B37/02
Inventor 张军明汪剑峰钱照明
Owner ZHEJIANG UNIV
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