CN112562972A - 一种贴片变压器及其加工方法 - Google Patents

一种贴片变压器及其加工方法 Download PDF

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CN112562972A
CN112562972A CN202011381405.6A CN202011381405A CN112562972A CN 112562972 A CN112562972 A CN 112562972A CN 202011381405 A CN202011381405 A CN 202011381405A CN 112562972 A CN112562972 A CN 112562972A
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adhesive layer
transformer
winding
molding compound
electrode
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CN112562972B (zh
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曾德平
林慧
唐小虎
周群生
谢伟
何勇明
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Shenzhen Sunlord Electronics Co Ltd
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    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/30Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306Fastening or mounting coils or windings on core, casing or other support
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    • H01F41/10Connecting leads to windings

Abstract

本发明公开了一种贴片变压器及其加工方法,所述贴片变压器包括胶层和绕线制品,所述绕线制品置于所述胶层内部,所述绕线制品包括工字型磁芯以及绕制在所述工字型磁芯中柱上的线包;所述线包的引出端连接电极,所述电极裸露于所述胶层的表面;所述胶层由磁性模塑料通过模压成型方式得到,跟同等性能指标的现有技术贴片变压器相比,该贴片变压器的尺寸更小,减小比例可达50%以上,且加工中无需用到BOBBIN以及绝缘胶带。此外,本发明中,贴片变压器中绕线制品均被胶层全面覆盖,故产品可靠性高,并可支撑PSIP塑封环境。

Description

一种贴片变压器及其加工方法
技术领域
本发明涉及开关电源模块领域,尤其涉及一种贴片变压器及其加工方法。
背景技术
目前传统辅助电源变压器如绕线变压器等,由于本身磁芯组装结构的限制无法适应塑封环境,容易出现开裂现象,最终导致电性能变化而无法满足使用要求,且传统绕线变压器尺寸大,小型化困难。如今,模块化是现代电子信息技术的主要趋势,电源模块也在不断增加,开关电源正朝着轻,小,薄,高可靠,高稳定,高频率,高效率方向发展,这就对辅助电源变压器提出了更高的要求,产品轻、小、薄、高可靠性是必然趋势,因此急需解决前述现有技术的各种缺陷,以满足需求。
以上背景技术内容的公开仅用于辅助理解本申请的发明构思及技术方案,其并不必然属于本申请的现有技术,在没有明确的证据表明上述内容在本申请的申请日已经公开的情况下,上述背景技术不应当用于评价本申请的新颖性和创造性。
发明内容
本发明的发明人研究发现,传统绕线变压器在塑封下的变压器磁芯容易出现电性能的变劣情况。进一步研究发现,是变压器磁芯发生了开裂现象而导致,引起变压器磁芯开裂的原因既与绕线变压器所处温度存在反复骤变的情况有关,更与传统绕线变压器的结果设计有关。
为克服前述现有技术缺陷,本发明提供贴片变压器,包括胶层和绕线制品,所述绕线制品置于所述胶层内部,所述绕线制品包括工字型磁芯以及绕制在所述工字型磁芯中柱上的线包;所述线包的引出端连接电极,所述电极裸露于所述胶层的表面;所述胶层由磁性模塑料通过模压成型方式得到。
本发明还可采用以下可选方案:
所述磁性模塑料采用Ni-Zn铁氧体粉和热固型环氧模塑料混合制作而成。
所述Ni-Zn铁氧体粉和所述热固型环氧模塑料混合料中,所述Ni-Zn铁氧体磁粉的重量百分比为20%~~90%。
所述线包为3层结构,共4个绕组;所述电极为Ag-Ni-Sn为3层结构电极,共有8个,分别于所述4个绕组的自由端连接。
所述电极面与所述胶层的距离为不小于0.04mm。
所述线包的引出端均为直角引出。
所述线包的引出端通过热压方式焊接固定。
所述胶层整体呈长方体状,所述电极裸露于所述胶层的一个表面上,所述胶层的其余表面均为平整表面。
本发明还进一步提供一种贴片变压器的加工方法,用于加工如上文任一项所述的贴片变压器,包括如下步骤:
将引线开始端挂在电极上并通过热压焊接固定;
绕线,即将线包绕设于工字型磁芯中柱上;
将引线结束端挂在电极上并通过热压焊接固定,得到绕线制品;
模压并固化成型,即将磁性模塑料注入装有所述绕线制品的模具型腔中进行模压,并固化成型;
最后脱模。
可选的,还包括:在所述模压并固化成型步骤前,先在模具Carrier板(载板)底面贴上一层耐高温胶纸,再将所述绕线制品放置到Carrier板的型腔中;使所述绕线制品的电极跟所述耐高温胶纸接触,然后将所述Carrier板安装到模具上;将由所述磁性模塑料制成的料饼放到加料室中,然后合模模压成型;所述模压成型过程包括:所述磁性模塑料制成的料饼先在设定温度下形成粘流态,然后在设定的填充压力下流动,直到所述磁性模塑料充满所述Carrier板的型腔,然后在设定的固化温度和固化压力下进行固化成型。
本发明与现有技术相比的有益效果至少包括:
因采用了整体塑封结构,所以跟同等性能指标的现有技术中的非塑封结构贴片变压器相比,本发明的贴片变压器的尺寸更小,减小比例可达50%以上,且加工中无需用到BOBBIN以及绝缘胶带。
此外,所述磁性模塑料采用Ni-Zn铁氧体粉和热固型环氧模塑料混合制作而成,得到的模塑料的CTE(coefficient of thermal expansion,热膨胀系数)与磁芯的CTE差异小,可解决反复温度冲击而导致的开裂分离问题,从而使得产品能支撑5次以上回流焊,大大提升了产品的可加工性和适用范围。
附图说明
图1是本发明一个实施例的塑封结构贴片变压器产品示意图。
图2是图1产品的结构透视示意图。
图3是一个实施例的工字型磁芯结构示意图。
图4一个实施例的线包与工字型磁芯装配示意图。
具体实施方式
下面结合附图1-4,对本发明的较优的实施例作进一步的详细说明。
本发明的贴片变压器主要是应用于辅助电源模块,在二次电源中作为反激变压器使用,是一种小尺寸、低漏感、可支撑PSIP(PSiP,Power Supply in Package封装电源/封装式电源)塑封且高可靠性的辅助电源变压器。
相关技术术语说明/定义如下:
耐高温胶纸:也叫耐高温胶带,即高温作业环境下使用的胶粘带,耐温性能通常在120度到260度之间。
实施例一
如图1所示,一种贴片变压器,采用塑封结构,包括胶层1和绕线制品,所述绕线制品置于所述胶层内部,被整体包覆,所述绕线制品包括工字型磁芯以及绕制在所述工字型磁芯中柱上的线包。
所述线包的引出端连接电极2,所述电极2裸露于所述胶层1的表面。所述胶层1由磁性模塑料通过模压成型方式得到,所述胶层1整体呈长方体状,所述电极2裸露于所述胶层1的一个表面上,所述胶层1的其余表面均为平整表面。
因采用了整体塑封结构,所以跟同等性能指标的现有技术贴片变压器相比,本发明的贴片变压器的尺寸更小,减小比例可达50%以上,且加工中无需用到BOBBIN以及绝缘胶带。
实施例二
本实施例在前述实施例一的基础上,采用了更优选的相关技术手段,以取得更佳的技术效果。以下结合相关产品的具体结构详细说明如下:
所述磁性模塑料采用Ni-Zn铁氧体粉和热固型环氧模塑料混合制作而成。优选的,所述Ni-Zn铁氧体粉和所述热固型环氧模塑料混合料中,所述Ni-Zn铁氧体磁粉的重量百分比为20%~90%。
如图2-4所示,所述绕线制品包括工字型磁芯3以及绕制在所述工字型磁芯3中柱上的线包4。所述线包3为3层结构,共4个绕组;所述电极2为Ag-Ni-Sn为3层结构电极,共有8个,分别与所述4个绕组的自由端连接。
所述电极2的电极面与所述胶层1表面的距离为不小于0.04mm,后续贴片加工时,突出的电极与焊锡有良好接触,贴片可靠性高。
所述电极2的所述线包的引出端均为直角引出(是相对于同侧4个电极的连线),通过热压方式焊接固定。通过直角引出所述线包的引出端,可简单有效的增加绕组之间的安全距离,从而能够降低产品的短路风险。
实施例三
本实施例提供一种用于加工塑封结构贴片变压器的加工方法,包括如下步骤:
将引线开始端挂在电极上并通过热压焊接固定。
绕线,即将线包绕设于工字型磁芯上。比如,漆包铜线(即线包)先是在工字型磁芯上进行绕线,初级侧以及次级侧各为两个绕组,共四个绕组。绕线时,两根漆包铜线进行双线并绕,构成一个初级绕组和一个次级绕组。然后,同样方式分别以单根漆包铜线构成另一个初级绕组和次级绕组。完成指定圈数的绕线后,引线结束端同样挂在电极上并通过热压焊接固定,最终形成绕线制品。优选的,所有所述线包的引出端均相对于同侧4个电极的连线成直角引出并通过热压焊接固定。
模压并固化成型,即将磁性模塑料注入装有所述绕线制品的模具型腔中进行模压,并固化成型。比如,绕线后绕线制品进行注塑时,先在模具Carrier板底面贴上一层耐高温胶纸,再将绕线制品放置到Carrier板型腔中;放置时,绕线制品电极面跟所述耐高温胶纸接触,然后将放满绕线制品的Carrier板安装到模具固定位置上,同时,将定制的磁性模塑料料饼放到加料室中,然后合模模压成型。模压成型时,磁性模塑料的料饼在高温下先形成粘流态,在一定的高压下流动并填充至装有绕线制品的型腔中,然后在保压高温下固化成型,脱模后形成单颗塑封产品。
其中,磁性模塑料采用Ni-Zn铁氧体粉和热固型环氧模塑料混合制作而成。优选的,所述Ni-Zn铁氧体磁粉的重量百分比为20%~90%。
优选的一个做法是,模压成型时,磁性模塑料的料饼在150℃~~200℃高温下先形成粘流态,在10MPa~30MPa的高压下流动并填充至装有绕线制品的型腔中。然后在保压高温150℃~~200℃下固化成型200~~300秒,最终在绕线制品周围形成胶层包覆结构。
通过对本发明前述提供的新型塑封结构贴片变压器结构和传统的绕线变压器结构进行对比可以看出:新型塑封结构贴片变压器产品尺寸小,体积小,无需用到BOBBIN(线轴,绕线筒)以及绝缘胶带,可根据产品使用环境的需要进行相应尺寸设计,尺寸灵活性大,相比同等性能指标的组装结构变压器,该结构可降低高度50%以上,减小体积50%以上。所述贴片变压器中绕线骨架以及线包均被磁性胶包覆填充,产品可靠性高,可支撑PSIP塑封环境。而而传统变压器由于绕线制品四周本身并未填充模塑料,当使用在塑封环境时,环境的塑封料就会填充到绕线制品四周,由于环境塑粉料与磁芯的CTE差异较大,当环境温度反复骤变后,磁芯开裂现象就不可避免。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明,不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的技术人员来说,在不脱离本发明构思的前提下,还可以做出若干等同替代或明显变型,而且性能或用途相同,都应当视为属于本发明的保护范围。

Claims (10)

1.一种贴片变压器,其特征在于,包括胶层和绕线制品,所述绕线制品置于所述胶层内部,所述绕线制品包括工字型磁芯以及绕制在所述工字型磁芯中柱上的线包;
所述线包的引出端连接电极,所述电极裸露于所述胶层的表面;
所述胶层由磁性模塑料通过模压成型方式得到。
2.如权利要求1所述的贴片变压器,其特征在于,所述磁性模塑料采用Ni-Zn铁氧体粉和热固型环氧模塑料混合制作而成。
3.如权利要求2所述的贴片变压器,其特征在于,所述Ni-Zn铁氧体粉和所述热固型环氧模塑料混合料中,所述Ni-Zn铁氧体磁粉的重量百分比为20%~~90%。
4.如权利要求1所述的贴片变压器,其特征在于,所述线包为3层结构,共4个绕组;所述电极为Ag-Ni-Sn为3层结构电极,共有8个,分别于所述4个绕组的自由端连接。
5.如权利要求4所述的贴片变压器,其特征在于,所述电极面与所述胶层的距离为不小于0.04mm。
6.如权利要求5所述的贴片变压器,其特征在于,与所述电极连接的所述线包的引出端均为直角引出。
7.如权利要求6所述的贴片变压器,其特征在于,所述线包的引出端通过热压方式焊接固定。
8.如权利要求1-7任一项所述的贴片变压器,其特征在于,所述胶层整体呈长方体状,所述电极裸露于所述胶层的一个表面上,所述胶层的其余表面均为平整表面。
9.一种贴片变压器的加工方法,用于加工如权利要求1~8任一项所述的贴片变压器,其特征在于,包括如下步骤:
将引线开始端挂在电极上并通过热压焊接固定;
绕线,即将线包绕设于工字型磁芯中柱上;
将引线结束端挂在电极上并通过热压焊接固定,得到绕线制品;
模压并固化成型,即将磁性模塑料注入装有所述绕线制品的模具型腔中进行模压,并固化成型;
最后脱模。
10.如权利要求9所述的贴片变压器的加工方法,其特征在于,还包括:
在所述模压并固化成型步骤前,先在模具Carrier板底面贴上一层耐高温胶纸,再将所述绕线制品放置到Carrier板的型腔中;
使所述绕线制品的电极跟所述耐高温胶纸接触,然后将所述Carrier板安装到模具上;
将由所述磁性模塑料制成的料饼放到加料室中,然后合模模压成型;
所述模压成型过程包括:
所述磁性模塑料制成的料饼先在设定温度下形成粘流态,然后在设定的填充压力下流动,直到所述磁性模塑料充满所述Carrier板的型腔,然后在设定的固化温度和固化压力下进行固化成型。
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