A single-stage isolated ac-dc converter based on interleaved parallel bridgeless pfc circuit and llc resonance

An AC-DC, isolated technology, applied in the direction of converting AC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problems of large conduction loss, large current ripple, and large volume. Achieve the effect of reducing the number of on-device devices, improving efficiency and wide application range

Active Publication Date: 2020-01-07
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the two-stage circuit uses more devices, the cost is higher, and the volume is larger.
[0006] Y.Wang and Y.Guan et al. titled ASingle-Stage LED Driver Based on Interleaved Buck-Boost Circuit and LLC Resonant Converter (IEEE Journal of Emerging And Selected Topics in Power Electronics,2015,3(3),pp.732-741 ) proposed a single-stage converter based on Buck-Boost and LLC, which has the functions of power factor correction and electrical isolation, and can realize soft switching of power devices; however, the front stage of the circuit uses The bridge rectification structure has a large conduction loss; at the same time, the input current of the circuit is in a discontinuous mode, and the current ripple in this mode is large

Method used

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  • A single-stage isolated ac-dc converter based on interleaved parallel bridgeless pfc circuit and llc resonance
  • A single-stage isolated ac-dc converter based on interleaved parallel bridgeless pfc circuit and llc resonance
  • A single-stage isolated ac-dc converter based on interleaved parallel bridgeless pfc circuit and llc resonance

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Embodiment Construction

[0040] 为使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例对本发明进行进一步的详细说明。应当理解,此处所描述的具体实施方式仅仅用以解释本发明,并不限定本发明的保护范围。

[0041] figure 1 为实施例提供的基于交错并联无桥PFC电路和LLC谐振的隔离型AC-DC变换器的结构示意图。 Such as figure 1 所示,本实施例提供的隔离型AC-DC变换器包括全桥LLC谐振电路,其中,全桥LLC谐振电路的原边包含有交错并联图腾柱PFC电路,形成全桥电路结构,副边为全桥整流电路结构。 The specific structure is as follows:

[0042] 全桥LLC谐振电路的原边包括:

[0043] 第一原边支路,由带反并联二极管D S1 的第一功率开关管S 1 、带反并联二极管D S2 的第二功率开关管S 2 串联组成;

[0044] 与第一原边支路并联的第二原边支路,由带反并联二极管D S3 的第三功率开关管S 3 、带反并联二极管D S4 的第四功率开关管S 4 串联组成;

[0045] 第一输入升压电感L B1 ,第一输入升压电感L B1 一端与输入电压V in 一端连接,另一端连接于第一功率开关管S 1 与第二功率开关管S 2 之间,即同时与第一功率开关管S 1 的源极与第二功率开关管S 2 的漏极相连;

[0046] 第二输入升压电感L B2 ,第二输入升压电感L B2 一端与输入电压V in 一端连接,另一端连接于第三功率开关管S 3 与第四功率开关管S 4 之间,即同时与第三功率开关管S 3 的源极与第四功率开关管S 4 的漏极相连;

[0047] 与第一原边支路并联的第三原边支路,由功率二极管D 1 and D 2 串联组成;

[0048] 直流母线电容C DC ,直流母线电容C DC 并联于第一原边支路,第二原边支路以及第三原边支路两端,即直流母线电容C DC 两端分别与第一功率开关管S 1 的漏极(第三功率开关管S 3 的漏极)和第二功率开关管S 2 的源极(第四功率开关管S 4 的源极)相连;

[0049] 串联的谐振电容C r 和谐振电感L r ,变压器T...

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Abstract

The present invention provides a single-stage isolated AC-DC converter based on an interleaved parallel bridgeless PFC circuit and LLC resonance, including a pre-stage interleaved parallel bridgeless PFC circuit for converting an AC input voltage into a DC voltage; The primary side of the full-bridge LLC resonant circuit in the latter stage is a full-bridge circuit structure, the primary side can realize zero-voltage soft turn-on of the switch tube, and the secondary side can realize zero-current soft turn-off of the diode. The converter reduces the number of switch tubes, thereby improving the efficiency of the whole converter. The AC / DC part of the converter is an interleaved parallel bridgeless PFC circuit. The two input inductor currents are interleaved so that the input current ripple is greatly reduced; the converter can make the input current follow the input voltage well and realize power factor correction. Function; the converter realizes stable DC voltage output by controlling the output voltage; at the same time, the converter has a high-frequency transformer, which can realize electrical isolation.

Description

technical field [0001] The invention belongs to the field of power electronics and specifically designs a single-stage isolated AC-DC converter based on an interleaved parallel bridgeless PFC circuit and LLC resonance. Background technique [0002] With the development of communication technology, electric vehicles and power systems, higher requirements are put forward for the performance, weight, volume, efficiency and reliability of switching power supplies for communications, electric vehicle chargers and electric operating power supplies. Power supplies in these fields Usually, the DC power is output from the AC grid, and considering the impact on the power quality of the grid and safety, the converter is required to have the functions of power factor correction and electrical isolation. [0003] The traditional bridge power factor correction circuit (commonly known as Boost PFC) has more power semiconductor devices through which current flows at the same time, and the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M3/335H02M1/42H02M1/14
CPCH02M1/14H02M1/4233H02M1/4241H02M3/33523H02M7/217H02M1/0058H02M1/007Y02B70/10
Inventor 邓焰李广地夏晋王昆阮杰
Owner ZHEJIANG UNIV
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