The development and characterization of step-up transformers with high winding ratios and laminated metallic magnetic cores for MHz-range step-up transformers used in DC-DC power converters is presented. The use of metallic magnetic cores with higher saturation flux density than traditional ferrites offers the possibility of reducing the physical size of the transformers. Core eddy currents are suppressed by forming the magnetic cores in a sequential electrodeposition process through toroidal lithographic molds, followed by self-assembly. This approach results in relatively thick magnetic cores (in the hundreds of microns range), comprised of many individual laminations with micron-scale thicknesses. Transformers were formed by manual winding of primary and secondary coils on these cores. The resultant transformers, with typical dimensions in the cubic millimeter range, exhibited primary and secondary inductances in the microhenry and hundreds of microhenry ranges, respectively. Typical transformer coupling coefficients were in the range 0.85–0.95. The transformers exhibited expected voltage step-up ratios as high as 10:1 at typical operation frequencies of 1–2 MHz. These ultracompact devices exhibit up to seven times higher inductance per unit volume and five times higher inductance per weight than typical commercial coupled inductors, and show promise for use in space-constrained electronic systems.

介绍了用于DC-DC电源转换器的MHz范围内升压变压器的高绕组比升压变压器和叠层金属磁芯的开发和特性。使用具有比传统铁氧体更高的饱和磁通密度的金属磁芯，可以减小变压器的物理尺寸。磁芯涡流通过在环形电沉积模具的顺序电沉积过程中形成磁芯，然后进行自组装来抑制。这种方法产生了相对较厚的磁芯（在数百微米范围内），由许多具有微米级厚度的单个叠片组成。变压器是通过手动将初级和次级线圈缠绕在这些铁芯上形成的。产生的变压器 由于其典型尺寸在立方毫米范围内，因此分别在微亨和数百微亨范围内表现出初级和次级电感。典型的变压器耦合系数在0.85-0.95范围内。这些变压器在1-2 MHz的典型工作频率下表现出高达10：1的预期升压比。与典型的商用耦合电感器相比，这些超紧凑型器件每单位体积的电感量高出七倍，而每重量重量的电感量高出五倍，并有望在空间受限的电子系统中使用。这些变压器在1-2 MHz的典型工作频率下表现出高达10：1的预期升压比。与典型的商用耦合电感器相比，这些超紧凑型器件每单位体积的电感量高出七倍，而每重量重量的电感量高出五倍，并有望在空间受限的电子系统中使用。这些变压器在1-2 MHz的典型工作频率下表现出高达10：1的预期升压比。与典型的商用耦合电感器相比，这些超紧凑型器件每单位体积的电感量高出七倍，而每重量重量的电感量高出五倍，并有望在空间受限的电子系统中使用。