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Aimed at the problem that DC-DC converters with coreless transformers must operate at high frequencies, a DC-DC converter with a coreless transformer based on free decay oscillation is proposed. First, a circuit model in series-series topology with no excitation sources is established, the evolution of the eigenvalue is discussed, and the free decay oscillation behavior of the system is analyzed. Second, the DC-DC converter with a coreless transformer based on free decay oscillation is designed. The switching frequency of this converter can be significantly lower than the operating frequency of the coreless transformer, and the output power from the converter and the operating frequency of the coreless transformer can be described by the eigenvalue of the free decay oscillation system. Finally, an experimental prototype was constructed, which was under constant duty control. The switching frequency of the converter was reduced to one half(103 kHz) and one third (69 kHz) of the operating frequency of the coreless transformer (206 kHz), respectively. The converter efficiency achieved 91.2%, and the transformer efficiency was always higher than 96%.
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针对基于无铁芯变压器的DC-DC变换器工作频率过高的问题,提出了一种基于自由衰减振荡的无铁芯变压器的DC-DC变换器。首先,建立无激励源的串联型-串联型拓扑电路理论模型,讨论特征根的演化过程,分析系统自由衰减振荡的运动行为。其次,设计基于自由衰减振荡无铁芯变压器的DC-DC变换器。实验结果表明,该变换器的开关频率可明显低于无铁芯变压器的工作频率,且其输出功率与无铁芯变压器的工作频率可被自由衰减振荡系统的特征根所描述。最后,构建一个实验样机,该样机采用固定占空比控制,当无铁芯变压器的工作频率为206 kHz、开关频率为103 kHz和69 kHz时,变换器的最高整机效率为91.2%,变压器效率在任何工况下均高于96%。
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 |
戴晨皓(1999-),男,硕士研究生。研究方向:基于无铁芯变压器的DC-DC变换器实现。E-mail: 202120115232@mail.scut.edu.cn。 |
张波(1962-),男,中国电源学会会士,通信作者,博士,二级教授。研究方向:电力电子与电力传动。E-mail: epbzhang@scut.edu.cn。
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戴晨皓(1999-),男,硕士研究生。研究方向:基于无铁芯变压器的DC-DC变换器实现。E-mail: 202120115232@mail.scut.edu.cn。
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戴晨皓(1999-),男,硕士研究生。研究方向:基于无铁芯变压器的DC-DC变换器实现。E-mail: 202120115232@mail.scut.edu.cn。
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张波(1962-),男,中国电源学会会士,通信作者,博士,二级教授。研究方向:电力电子与电力传动。E-mail: epbzhang@scut.edu.cn。
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张波(1962-),男,中国电源学会会士,通信作者,博士,二级教授。研究方向:电力电子与电力传动。E-mail: epbzhang@scut.edu.cn。
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Normalized eigenvalue, figureFileSmall=tCkZ96HiMH0e6zezSl6/Iw==, figureFileBig=A9NKAoWcJmsjZaEQiT1XmQ==, tableContent=null), ArticleFig(id=1154038601642926943, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图2, caption=
归一化特征根, figureFileSmall=tCkZ96HiMH0e6zezSl6/Iw==, figureFileBig=A9NKAoWcJmsjZaEQiT1XmQ==, tableContent=null), ArticleFig(id=1154038601714230113, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 3, caption=
Simulation waveforms of free decay oscillation of primary and secondary circuit in frequency split phase, figureFileSmall=sq1pP+3nOHPcGJvoCmXUdA==, figureFileBig=Yfya8bPVO/Jta1aSpgjG5w==, tableContent=null), ArticleFig(id=1154038601798116197, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图3, caption=
频率分裂态下的原、副边电路自由衰减振荡仿真波形, figureFileSmall=sq1pP+3nOHPcGJvoCmXUdA==, figureFileBig=Yfya8bPVO/Jta1aSpgjG5w==, tableContent=null), ArticleFig(id=1154038601907168105, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 4, caption=
Waveforms of free decay oscillation of primary and secondary circuit in decay rate split phase, figureFileSmall=fVYkBVB7OAOUSOWjjOTrSg==, figureFileBig=ytc0GIDyM9eSOAlk/h2+zg==, tableContent=null), ArticleFig(id=1154038601974276973, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图4, caption=
衰减率分裂态下的原、副边电路自由衰减振荡波形, figureFileSmall=fVYkBVB7OAOUSOWjjOTrSg==, figureFileBig=ytc0GIDyM9eSOAlk/h2+zg==, tableContent=null), ArticleFig(id=1154038602032997231, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 5, caption=
Schematic of the proposed converter, figureFileSmall=nfbjHxMgArEPDfeLYMjw5g==, figureFileBig=Ogd/WtpAGBVi/Eeyp1HmJw==, tableContent=null), ArticleFig(id=1154038602116883316, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图5, caption=
变换器示意, figureFileSmall=nfbjHxMgArEPDfeLYMjw5g==, figureFileBig=Ogd/WtpAGBVi/Eeyp1HmJw==, tableContent=null), ArticleFig(id=1154038602167214965, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 6, caption=
Photo of experimental prototype, figureFileSmall=LFnBGaW9DEQWJBUvzJhHTg==, figureFileBig=1ZbBg2RI46HvhhkP2N7zsg==, tableContent=null), ArticleFig(id=1154038602242712440, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图6, caption=
实验样机实物, figureFileSmall=LFnBGaW9DEQWJBUvzJhHTg==, figureFileBig=1ZbBg2RI46HvhhkP2N7zsg==, tableContent=null), ArticleFig(id=1154038602305627001, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 7, caption=
Experimental waveforms of system, figureFileSmall=Oo0dNM2/WxKcPM5qIk7kDQ==, figureFileBig=DSVHXMbTPvkAgAg51fs7AQ==, tableContent=null), ArticleFig(id=1154038602385318780, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图7, caption=
系统实验波形, figureFileSmall=Oo0dNM2/WxKcPM5qIk7kDQ==, figureFileBig=DSVHXMbTPvkAgAg51fs7AQ==, tableContent=null), ArticleFig(id=1154038602456621949, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Fig. 8, caption=
Transmission characteristics of system when $N = 2$, figureFileSmall=MgI77f5/YMhmpAtkBDC00g==, figureFileBig=wF+aAxKDv7by5V1dAMpyFQ==, tableContent=null), ArticleFig(id=1154038602515342208, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=图8, caption=
${N}= 2$ 时系统的传输特性, figureFileSmall=MgI77f5/YMhmpAtkBDC00g==, figureFileBig=wF+aAxKDv7by5V1dAMpyFQ==, tableContent=null), ArticleFig(id=1154038602590839683, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Tab. 1, caption=
Summary of free decay oscillation characteristics, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作模态 | 负载电阻取值 | 是否有主极点 | 极点的解析解 | 等效衰减率${\gamma }_{\mathrm{{eq}}}$ | 自由振荡频率${\omega }_{\mathrm{s}}$ | 平均消散功率${P}_{\mathrm{{ss}}}$ |
| 频率分裂态 | ${R}_{\mathrm{L}}< {R}_{\mathrm{C}}$ | 否 | 难以求解 | $\frac{{R}_{\mathrm{L}}}{4\left({1 -{k}^{2}}\right){L}_{2}}$ | 收敛于$\frac{{\omega }_{0}}{\sqrt{1 \pm k}}$ | $\frac{{R}_{\mathrm{L}}}{2\left({1 -{k}^{2}}\right){L}_{2}}{E}_{\sum }$ |
| 衰减率分裂 | ${R}_{\mathrm{L}}> {R}_{\mathrm{C}}$ | 是 | $s \approx -\frac{{\omega }_{0}^{2}{M}^{2}}{2{R}_{\mathrm{L}}{L}_{1}}= \pm \mathrm{j}{\omega }_{0}$ | $\frac{{\omega }_{0}^{2}{M}^{2}}{2{R}_{\mathrm{L}}{L}_{1}}$ | ${\omega }_{0}$ | $\frac{{\omega }_{0}^{2}{M}^{2}}{{R}_{\mathrm{I}}{L}_{1}}{E}_{\sum }$ |
), ArticleFig(id=1154038602657948550, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=表1, caption=
自由衰减振荡特性总结, figureFileSmall=null, figureFileBig=null, tableContent=
| 工作模态 | 负载电阻取值 | 是否有主极点 | 极点的解析解 | 等效衰减率${\gamma }_{\mathrm{{eq}}}$ | 自由振荡频率${\omega }_{\mathrm{s}}$ | 平均消散功率${P}_{\mathrm{{ss}}}$ |
| 频率分裂态 | ${R}_{\mathrm{L}}< {R}_{\mathrm{C}}$ | 否 | 难以求解 | $\frac{{R}_{\mathrm{L}}}{4\left({1 -{k}^{2}}\right){L}_{2}}$ | 收敛于$\frac{{\omega }_{0}}{\sqrt{1 \pm k}}$ | $\frac{{R}_{\mathrm{L}}}{2\left({1 -{k}^{2}}\right){L}_{2}}{E}_{\sum }$ |
| 衰减率分裂 | ${R}_{\mathrm{L}}> {R}_{\mathrm{C}}$ | 是 | $s \approx -\frac{{\omega }_{0}^{2}{M}^{2}}{2{R}_{\mathrm{L}}{L}_{1}}= \pm \mathrm{j}{\omega }_{0}$ | $\frac{{\omega }_{0}^{2}{M}^{2}}{2{R}_{\mathrm{L}}{L}_{1}}$ | ${\omega }_{0}$ | $\frac{{\omega }_{0}^{2}{M}^{2}}{{R}_{\mathrm{I}}{L}_{1}}{E}_{\sum }$ |
), ArticleFig(id=1154038602737640330, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=EN, label=Tab. 2, caption=
Experimental parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 原边电感${L}_{1}/\mu \mathrm{H}$ | 40.11 | 副边电感${L}_{2}/\mu \mathrm{H}$ | 14.49 |
| 原边电容${C}_{1}/\mathrm{{nF}}$ | 39.98 | 副边电容${C}_{2}/\mathrm{{nF}}$ | 14.70 |
| 原边内阻${r}_{1}/\mathrm{m}\Omega$ | 150 | 副边内阻${r}_{2}/\mathrm{m}\Omega$ | 45 |
| 耦合系数$k$ | 0.3970 | 固有频率${f}_{0}/\mathrm{{kHz}}$ | 206 |
| 输入电压${U}_{i}/\mathrm{V}$ | 60 | 负载电阻${R}_{\mathrm{B}}/\Omega$ | 3~45 |
| 周期比$N$ | 2,3 | 占空比$d$ | 0.7 |
), ArticleFig(id=1154038602796360589, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038486727385852, language=CN, label=表2, caption=
实验参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 原边电感${L}_{1}/\mu \mathrm{H}$ | 40.11 | 副边电感${L}_{2}/\mu \mathrm{H}$ | 14.49 |
| 原边电容${C}_{1}/\mathrm{{nF}}$ | 39.98 | 副边电容${C}_{2}/\mathrm{{nF}}$ | 14.70 |
| 原边内阻${r}_{1}/\mathrm{m}\Omega$ | 150 | 副边内阻${r}_{2}/\mathrm{m}\Omega$ | 45 |
| 耦合系数$k$ | 0.3970 | 固有频率${f}_{0}/\mathrm{{kHz}}$ | 206 |
| 输入电压${U}_{i}/\mathrm{V}$ | 60 | 负载电阻${R}_{\mathrm{B}}/\Omega$ | 3~45 |
| 周期比$N$ | 2,3 | 占空比$d$ | 0.7 |
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