A kind of llc resonant converter applied in distributed power supply

Abstract

The invention discloses an LLC resonance transducer applied to a distributed power source. The LLC resonance transducer comprises a direct-current power supply source (Vin), wherein an inverter circuit is connected to the direct-current power supply source (Vin), a resonance network is connected to the inverter circuit in parallel and is connected with a primary side winding of a transformer in series, and a secondary side winding of the transformer is connected with an output rectification filter circuit. According to the LLC resonance transducer, higher voltage gain can be obtained at the same frequency, and because the improved LLC resonance transducer has the function of promoting currents, under the circumstance that no voltage boosting link of changing an alternating current (AC) to a direct current (DC) exists, the operating frequency of an LLC resonant transducing link can be reduced. When the LLC resonance transducer, provided by the invention, with an auxiliary circuit normally works, the operating state can be improved, and power density and working efficiency are higher.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, in particular to an LLC resonant converter used in distributed power supplies. Background technique [0002] Distributed power supply systems are widely used in power communication systems. Distributed power supply systems use small power modules and large-scale control integrated circuits as basic components, and use the latest theories and technological achievements to form building blocks and intelligent high-power power supplies. , so that strong electricity and weak electricity are closely combined, reducing the development pressure of high-power components and high-power devices (centralized), and improving production efficiency. [0003] Distributed power is usually connected to medium-voltage or low-voltage power distribution systems, and will have a wide and far-reaching impact on power distribution systems. Distributed power generation is an important way to promote th...

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Problems solved by technology

[0006] In order to meet the condition of holding time in the distributed power supply, the LLC resonant converter is required to ensure that the output voltage does not drop even at a lower input voltage, so the LLC resonant converter needs to obtain a higher voltage gain than the normal working state. In order to adapt to the higher voltage gain, the LLC resonant converter needs to work far away from the resonant frequency, which leads to the increase of the primary current and reduces the average efficiency in a wide range of input

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