基于彈載的高功率密度LLC變換器設(shè)計(jì)
2020年電子技術(shù)應(yīng)用第11期
吳振葦,，李雙剛，張 麗，何嬌嬌
上?？臻g電源研究所,，上海200245
摘要： 傳統(tǒng)脈沖寬度控制技術(shù)使得電源變換器中開關(guān)管工作在硬開關(guān)狀態(tài),，產(chǎn)生的功率損耗會(huì)導(dǎo)致效率降低,，選擇適當(dāng)?shù)能涢_關(guān)技術(shù)可以有效降低開關(guān)損耗。針對(duì)某導(dǎo)彈型號(hào)XX-11設(shè)計(jì)了一款二次電源產(chǎn)品,，前級(jí)通過PFC電路以實(shí)現(xiàn)功率因數(shù)校正,，同時(shí)采取LLC諧振技術(shù)來實(shí)現(xiàn)軟開關(guān)工作，提高電源效率,。介紹了LLC諧振電路工作原理,，用基波分析法對(duì)其建模，分析了諧振參數(shù)的對(duì)變換器增益和輸出效率的影響,，同時(shí)采用了磁集成的方法以提高功率密度,。基于以上分析和設(shè)計(jì)，制作了一臺(tái)630 W的產(chǎn)品,，具有寬范圍輸入電壓和高效率等優(yōu)點(diǎn),。
中圖分類號(hào)： TN86
文獻(xiàn)標(biāo)識(shí)碼： A
DOI：10.16157/j.issn.0258-7998.200517
中文引用格式： 吳振葦，李雙剛,，張麗,，等. 基于彈載的高功率密度LLC變換器設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2020,，46(11)：109-113.
英文引用格式： Wu Zhenwei，Li Shuanggang,，Zhang Li,，et al. Design of LLC converter with high power density on the missile[J]. Application of Electronic Technique，2020,，46(11)：109-113.
文獻(xiàn)標(biāo)識(shí)碼： A
DOI：10.16157/j.issn.0258-7998.200517
中文引用格式： 吳振葦，李雙剛,，張麗,，等. 基于彈載的高功率密度LLC變換器設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2020,，46(11)：109-113.
英文引用格式： Wu Zhenwei，Li Shuanggang,，Zhang Li,，et al. Design of LLC converter with high power density on the missile[J]. Application of Electronic Technique，2020,，46(11)：109-113.
Design of LLC converter with high power density on the missile
Wu Zhenwei,，Li Shuanggang，Zhang Li,，He Jiaojiao
Shanghai Institute of Space Power-Sources,，Shanghai 200245，China
Abstract： The traditional pulse width control technology makes the switching tube in the power converter work in a hard switching state, and generates power loss that leads to efficiency decrease. Choosing the appropriate soft switching technology can effectively reduce the switching loss. This article designs a power supply product for a missile XX-11,，where the front stage uses PFC circuit to achieve power factor correction, and adopts LLC resonance technology to realize the soft switching work of power tube. The switching loss is reduced, and the working efficiency of the converter is improved. The article introduces the working principle of LLC resonant circuit, uses FHA method and analyzes the influence of resonance parameters on converter gain and output efficiency, and adopts magnetic integration method to improve power density. Based on the above analysis and design, a 630W product was produced, and its electrical performance was tested and verified.
Key words : soft switching,；LLC resonant converter；first harmonic approximation method,；magnetic integration,；fixed frequency control
0 引言
隨著開關(guān)電源技術(shù)朝著高頻化方向發(fā)展，電源的開關(guān)頻率逐步增大,，從而使變壓器,、電感等磁性元件的體積減小，提高電源的功率密度,。但是,，對(duì)于傳統(tǒng)硬開關(guān)電路來說，由于開關(guān)管工作于硬開關(guān)狀態(tài),，開關(guān)頻率提高就意味著大大地增加了開關(guān)損耗,，從而降低了效率[1]。LLC諧振變換器作為熱門的軟開關(guān)電路之一,，綜合了串聯(lián)諧振變換器SRC和并聯(lián)諧振變換器PRC,，具有效率高、器件應(yīng)力小等優(yōu)點(diǎn)[2],。LLC變換器實(shí)現(xiàn)了橋臂開關(guān)管的ZVS,、副邊整流管ZCS，從而大大減小了開關(guān)損耗與電磁干擾，提升了電源功率密度,，利于電源高頻發(fā)展,。但其為實(shí)現(xiàn)寬范圍輸出電壓，一般采取調(diào)節(jié)開關(guān)頻率的控制方式,，而開關(guān)頻率變化范圍過大不利于磁性元件的設(shè)計(jì)[3],，同時(shí)也容易導(dǎo)致輸出不穩(wěn)定。本文采用了Buck-LLC兩級(jí)結(jié)構(gòu)電路拓?fù)?，固定LLC變換器開關(guān)頻率以提升電源效率,，控制Buck電路占空比以調(diào)節(jié)輸出。
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作者信息:
吳振葦,，李雙剛,，張 麗，何嬌嬌
(上?？臻g電源研究所,，上海200245)
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