CN113839563A - 设置低压dc-dc变换器的变压器的气隙和匝数比的方法和设备 - Google Patents
设置低压dc-dc变换器的变压器的气隙和匝数比的方法和设备 Download PDFInfo
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Abstract
本公开涉及设置低压DC‑DC变换器的变压器的气隙和匝数比的方法和设备。所述方法包括:基于电压/电流容量和寄生电容设置功率开关元件;设置最小电感以确保功率开关元件的零电压开关操作;基于变压器的输入电压范围调整变压器的铁芯区域中的气隙和匝数比;计算变压器的漏感;比较最小电感与漏感;以及基于比较结果自适应地执行调整。
Description
本申请是申请日为2019年7月17日、申请号为201910645666.5、发明名称为“低压DC-DC变换器及其驱动方法”的分案申请,其全部内容结合于此作为参考。
相关申请的交叉引用
本申请要求2018年7月18日提交的韩国专利申请No.2018-0083575的优先权和权益,其公开内容通过引用全部结合于此。
技术领域
本发明涉及低压DC-DC变换器及其驱动方法。
背景技术
低电压直流(DC)-直流(DC)变换器(LDC)是电力供应件,其需要负责向电负载供应电力并且对安装在环保车辆中的低电压辅助电池充电。
根据驱动方法将这种低压DC-DC变换器分类为各种类型,并且以全桥方式(full-bridge manner)变换高功率,以执行绝缘开关操作。
然而,在功率开关元件的控制开关操作期间,在传统LDC中发生开关功率损耗。
同时,为了解决该问题,韩国未审查专利公开No.1998-040074(标题:零电压开关DC-DC降压变换器)公开了功率开关元件的零电压开关技术。
也就是说,现有技术使用零电压开关操作来减少开关功率损耗。
然而,在现有技术中,应另外安装零电压开关电感器以确保零电压开关操作。
然而,由于零电压开关电感器在功率开关元件的高速开关操作期间产生热量,因此需要使用散热板的散热结构,并且从系统的角度来看需要大的空间。
发明内容
本发明旨在提供一种用于设置低压DC-DC转换器的变压器的铁芯区域中的气隙和匝数比的方法和设备,其能够通过在变压器的核心区域中增加气隙(air gap)并调节变压器的匝数比来减小产品的尺寸和成本并增加功率密度。
然而,本实施方式的技术目标不限于上述技术目标,并且可存在其他技术目标。
根据本发明的一个方面,提供了一种用于设置低压DC-DC转换器的变压器的铁芯区域中的气隙和匝数比的方法,包括:基于电压/电流容量和寄生电容设置功率开关元件;设置最小电感以确保功率开关元件的零电压开关操作;基于变压器的输入电压范围调整变压器的铁芯区域中的气隙和匝数比;计算变压器的漏感;比较最小电感与漏感;以及基于比较结果自适应地执行调整。
最小电感是基于功率开关元件的寄生电容设置的。
匝数比是基于变压器的初级输入电流、次级输入电流和磁化电流设置的。
铁芯区域中的气隙是基于磁化电感、初级匝数、铁芯区域的磁阻和气隙的磁阻设置的。
漏感是基于初级漏感、初级匝数和初级电路电阻计算的。
此外,根据本发明的另一方面,提供一种用于设置低压DC-DC转换器的变压器的铁芯区域中的气隙和匝数比的设备,该设备包括:用于基于电压/电流容量和寄生电容设置功率开关元件的装置;用于设置最小电感以确保功率开关元件的零电压开关操作的装置;用于基于变压器的输入电压范围调整变压器的铁芯区域中的气隙和匝数比的装置;用于计算变压器的漏感的装置;以及用于比较最小电感与漏感的装置,其中,用于调整的装置被配置为基于比较结果自适应地调整铁芯区域中的气隙和匝数比。
最小电感是基于功率开关元件的寄生电容设置的。
匝数比是基于变压器的初级输入电流、次级输入电流和磁化电流设置的。
铁芯区域中的气隙是基于磁化电感、初级匝数、铁芯区域的磁阻和气隙的磁阻设置的。
漏感是基于初级漏感、初级匝数和初级电路电阻计算的。
附图说明
通过参考附图详细描述本发明的示例性实施方式,本发明的上述和其他目的、特征和优点对于本领域普通技术人员将变得更加明显,其中:
图1是示出根据现有技术以全桥方式操作的低电压直流(DC)-DC变换器的视图;
图2是说明根据本发明的一个实施方式的低压DC-DC变换器的配置图;
图3是用于描述根据本发明的一个实施方式的低压DC-DC变换器的视图;
图4是表示根据本发明的一个实施方式的低压DC-DC变换器的变压器的视图;
图5是根据本发明的一个实施方式的驱动低压DC-DC变换器的方法的流程图。
图6是根据本发明的一个实施方式的设置低压DC-DC变换器的变压器的方法的流程图。
图7是表示根据各现有技术和本发明的一个实施方式的低压DC-DC变换器的变压器的内部结构的视图;
图8A是示出根据各现有技术的低压DC-DC变换器的输出波形的视图,图8B是表示根据本发明的一个实施方式的低压DC-DC变换器的输出波形的图;以及
图9是示出根据各现有技术和本发明的一个实施方式的低压DC-DC变换器的输出值的表。
具体实施方式
在下文中,将参考附图详细描述本领域技术人员容易执行的实施方式。然而,本发明的实施方式可以以若干不同的形式实现,并且不限于这里描述的实施方式。另外,为了清楚地说明本发明的实施方式,在附图中省略了与描述无关的部分。
同时,提供本文使用的术语仅是为了描述本发明的实施方式而不是为了限制的目的。除非上下文另有明确说明,否则单数形式包括复数形式。应当理解,术语“包括”和“包含”在本文中使用时,指定一些陈述的组件、步骤、操作和/或元件,但不排除存在或添加一个或多个其他组件、步骤、操作和/或元件。
本发明涉及低电压直流(DC)-DC变换器100及其驱动方法。
在环保型车辆中,低压DC-DC变换器是用于使用来自高电压主电池的高电压输出对低电压辅助电池充电并且向安装在车辆中的各种电负载供电的必要装置。此外,高功率变换使用全桥方式来执行绝缘开关操作。
在下文中,将参考图1描述传统的低压DC-DC变换器的操作。
图1是示出根据现有技术以全桥方式操作的低压DC-DC变换器的视图。
在这种情况下,由于在功率开关元件Q1,Q2,Q3和Q4的操作期间发生功率损耗,因此使用零电压开关操作来最小化开关功率损耗。
零电压开关操作是功率元件的高速开关技术,并且是有助于在变换器领域中实现高效率的重要因素,但是需要零电压开关电感器Lzvs。
然而,由于零电压开关电感器Lzvs在功率开关元件Q1,Q2,Q3和Q4的开关操作期间产生热量,因此需要使用散热器或其冷却系统的散热结构,因此从系统的角度来看需要大的空间,并且需要增加产品的尺寸。
在本发明的一个实施方式中,在变压器120的核心区域中添加气隙,并且调节变压器120的匝数比以代替传统的零电压开关电感器。
在下文中,将参考图2至图4描述根据本发明的一个实施方式的低压DC-DC变换器100。
图2是示出根据本发明的一个实施方式的低压DC-DC变换器100的配置图。图3是用于描述根据本发明的一个实施方式的低压DC-DC变换器100的视图。图4是示出根据本发明的一个实施方式的低压DC-DC变换器100的变压器120的视图。
如图2中所示,根据本发明的一个实施方式的低压DC-DC变换器100包括开关110、变压器120和电源130。
开关110将从车辆的高电压电池供应的高电压变换为AC电压。
参见图3,功率开关元件Q1,Q2,Q3和Q4以全桥方式设置在开关110中,并且可使用将在下面描述的漏电感(leakage inductance)Llk1执行零电压开关操作。
此外,从开关110移除根据现有技术安装用于零电压开关操作的电感器Lzvs,在上述变压器120的核心区域中添加气隙,并且调节其匝数比以代替变压器120的初级漏电感Llk1,从而降低材料成本和产品尺寸。另外,由于产品的尺寸减小,产品的功率密度可增加。
变压器120将从开关110输出的AC电压降低为低电压,并将降低的电压传输到电源130。
参考图4,由于在变压器120的核心区域中添加了气隙,因此根据等式1减小磁化电感(magnetizing inductance)Lm。
[等式1]
这里,Lm是变压器120的磁化电感,N1是变压器120的初级匝数,Rc是核心区域的磁阻,以及Rg是气隙的磁阻。
由于根据本发明的一个实施方式的变压器120的核心由磁性材料形成,并且当超过磁性材料固有的饱和特性的电流被施加到其上时可能不执行正常功能,认为变压器120的匝数比减小了磁化电流。
因此,通过调节变压器120的匝数比,可实现如下效果:变压器120的磁化电流im根据等式2减小,并且变压器120的初级漏电感Llk1根据等式增加3。
[等式2]
这里,im是变压器120的磁化电流,i1是变压器120的初级输入电流,N1是变压器120的初级匝数,N2是变压器120的次级匝数,并且i2是变压器120的次级输出电流。
[等式3]
这里,Llk1是变压器120的初级漏电感值,N1是变压器120的初级匝数,并且R1是变压器120的初级电路电阻。
电源130对来自变压器120的低电压输出进行整流,并将整流的低电压提供给负载。
在下文中,将参考图5描述驱动低压DC-DC变换器100的方法。
图5是根据本发明的一个实施方式的驱动低压DC-DC变换器100的方法的流程图。
参照图5,首先,在驱动低压DC-DC变换器100的方法中,将从车辆的高电压电池供应的高电压变换为AC电压(S110)。
此时,根据本发明的一个实施方式,功率开关元件可以以全桥方式设置,以将车辆的高电压变换为AC电压。
然后,使用其中在核心区域中添加气隙并调节匝数比的变压器120将AC电压降低为低电压。
此时,由于已经参考图4和上述等式1至等式3描述了在变压器120的核心区域中添加气隙并且调节匝数比的具体描述,下面将省略具体描述。
最后,对低电压进行整流并将其提供给车辆的低电压辅助电池和电负载(S130)。
在以上描述中,S110至S130的操作可进一步划分为附加操作或者组合成减少数量的操作。另外,可根据需要省略一些操作,或者也可改变操作的顺序。另外,即使已经参考图4描述的其他省略的操作也可应用于驱动图5的低压DC-DC变换器100的方法。
同时,可通过图6的方法设置根据本发明的一个实施方式的低压DC-DC变换器100的变压器120。
图6是根据本发明的一个实施方式的设置低压DC-DC变换器100的变压器120的方法的流程图。
参照图6,首先,通过考虑电压/电流容量和寄生电容来设置功率开关元件(S210)。
然后,设置最小电感Lmin的值以确保零电压开关操作(S220)。
这里,最小电感值是零电压开关电感器确保功率开关元件的零电压开关操作的最小值,并且被设置为使得功率开关元件的寄生电容小于存储在零电压开关电感器中的能量。
然后,根据本发明的一个实施方式,设定变压器120的匝数比并调节气隙(S230)。
此时,考虑输入电压范围来设定变压器120的匝数比并调节核心区域的气隙。
然后,使用上述等式3计算变压器120的漏电感Llk1的值(S240)。
然后,比较最小电感Lmin的设定值和计算的漏电感Llk1的值(S250)。
在比较结果中最小电感Lmin的值小于漏电感Llk1的值的情况下,在减小的磁化电流和磁化电感以及增加的漏电感值的条件下形成的变压器120应用于产品(S260)。
相反,在最小电感Lmin的值大于漏电感Llk1的值的情况下,再次执行设置匝数比并调节气隙的操作S230。
在下文中,将参考图7至图9描述根据现有技术的变压器120的内部结构,根据本发明的一个实施方式的变压器120的内部结构,以及根据变压器120的核心区域中的气隙的增加和匝数比的调节的输出值的变化。
图7是示出根据各现有技术和本发明的一个实施方式的低压DC-DC变换器100的变压器120的内部结构的视图。
参照图7,在本发明的一个实施方式中,根据现有技术另外安装在变压器120中的零电压开关电感器从变压器120中移除,气隙被添加在变压器120的核心区域中,并且调节变压器120的匝数比以代替零电压开关电感器。因此,与传统变压器相比,可减少组件数量,从而降低材料成本和产品尺寸。另外,由于产品的尺寸减小,产品的功率密度可增加。
图8A是示出根据各现有技术的低压DC-DC变换器的输出波形的视图。图8B是示出根据本发明的一个实施方式的低压DC-DC变换器100的输出波形的视图,并且示出了可在多个执行结果之间容易地比较的结果。图9是示出根据各现有技术和本发明的一个实施方式的低压DC-DC变换器100的输出值的表。
图8A示出了使用根据现有技术的输出值形成的波形,图8B示出了在变压器120的核心区域中添加气隙并且调节匝数比之后使用输出值形成的波形。
根据本发明的一个实施方式,匝数比可调节为11:1:1。
参见图9,根据本发明的一个实施方式的输入电压和输入电流与根据现有技术的输入电压和输入电流相同。根据现有技术的800μH的磁化电感在根据本发明的一个实施方式在变压器120的核心区域中添加气隙并且调节匝数比之后减小到210μH。此外,变压器120的漏电感从2.8μH增加到4.3μH。
在仿真结果中,可看出,随着磁化电感减小,磁化电流减小,并且低压DC-DC变换器100的操作性能高于或等于传统低压DC-DC变换器的操作性能,并且由于磁化电流减小,与传统的低压DC-DC变换器相比,输入电流减小,从而可预期系统效率提高的效果。此外,可看出,还能够确保变压器120的占空比的余量。
根据本发明的一个实施方式,通过在变压器的核心区域中增加气隙并调节匝数比,可显著降低产品的成本和尺寸。
还可根据产品的尺寸减小来增加低压DC-DC变换器的功率密度。
以上描述仅是示例性的,并且本领域技术人员将理解,本发明可以以其他具体形式执行而不改变技术范围和基本特征。因此,上述实施方式应该仅被视为所有方面的实例,而不是为了限制的目的。例如,描述为单一类型的每个组件可以以分布式方式实现,并且类似地,被描述为分布式的组件可以以耦合方式实现。
本发明的范围由所附权利要求限定,并且包括源自所附权利要求的含义、范围和等同物的所有修改或变更。
Claims (10)
1.一种用于设置低压DC-DC转换器的变压器的铁芯区域中的气隙和匝数比的方法,所述方法包括以下步骤:
基于电压/电流容量和寄生电容设置功率开关元件;
设置最小电感以确保所述功率开关元件的零电压开关操作;
基于所述变压器的输入电压范围调整所述变压器的所述铁芯区域中的所述气隙和所述匝数比;
计算所述变压器的漏感;
比较所述最小电感与所述漏感;以及
基于比较结果自适应地执行所述调整。
2.根据权利要求1所述的方法,其中,所述最小电感是基于功率开关元件的寄生电容设置的。
3.根据权利要求1所述的方法,其中,所述匝数比是基于所述变压器的初级输入电流、次级输入电流和磁化电流设置的。
4.根据权利要求1所述的方法,其中,所述铁芯区域中的所述气隙是基于磁化电感、初级匝数、所述铁芯区域的磁阻和所述气隙的磁阻设置的。
5.根据权利要求1所述的方法,其中,所述漏感是基于初级漏感、初级匝数和初级电路电阻计算的。
6.一种用于设置低压DC-DC转换器的变压器的铁芯区域中的气隙和匝数比的设备,所述设备包括:
用于基于电压/电流容量和寄生电容设置功率开关元件的装置;
用于设置最小电感以确保所述功率开关元件的零电压开关操作的装置;
用于基于所述变压器的输入电压范围调整所述变压器的所述铁芯区域中的所述气隙和所述匝数比的装置;
用于计算所述变压器的漏感的装置;以及
用于比较所述最小电感与所述漏感的装置,
其中,用于调整的装置被配置为基于比较结果自适应地调整所述铁芯区域中的所述气隙和所述匝数比。
7.根据权利要求6所述的装置,其中,所述最小电感是基于功率开关元件的寄生电容设置的。
8.根据权利要求6所述的装置,其中,所述匝数比是基于所述变压器的初级输入电流、次级输入电流和磁化电流设置的。
9.根据权利要求6所述的装置,其中,所述铁芯区域中的所述气隙是基于磁化电感、初级匝数、所述铁芯区域的磁阻和所述气隙的磁阻设置的。
10.根据权利要求6所述的装置,其中,所述漏感是基于初级漏感、初级匝数和初级电路电阻计算的。
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