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Light load efficiency of high frequency DC/DC converters used in portable electronic devices is very important for extending lifetime of batteries. This paper proposes to use large-range gradually changed nonlinear inductors with adaptive on time control to improve the light load efficiency not only in DCM, but also in CCM. Loss reduction is demonstrated by calculating loss of a conventional converter...
Low temperature co-fired ceramic (LTCC) technology has been proved to be an effective way to realize system integration. By using this technology, passive components in a DC/DC converter could be integrated into a passive substrate. This paper presents fabrication and evaluation of LTCC capacitors and inductors and summarizes challenges of applying LTCC technology to DC/DC converters. Four capacitors...
This paper focuses on designing of multi-turn spiral inductors with multilayer parallel-connected conductors for high frequency DC/DC converters based on low temperature co-fired ceramic (LTCC) technology. Effects of conductors' arrangements on performance of LTCC inductors are analyzed. Based on observation and analysis, a model to approximate inductance of LTCC inductors is derived. Simulation results...
Using coupled inductors in multi-phase point of load converters is an effective way to improve system steady state and dynamic performance. Thus, package of coupled inductors for system three-dimensional integration is attracting great interest of research. This paper explores design, fabrication and analysis of planar coupled inductors based on low temperature co-fired ceramic technology. Four structures...
A two-stage topology which is very suitable for 24 V input, low voltage and high current output DC/DC converter is proposed. The first stage is two-phase interleaved Boost for regulating voltage, and the second stage is a fixed 50% duty cycle full-bridge (FB) for isolation and power transmission. To show its advantages in loss reduction, two topologies are also introduced for loss comparison. One...
This paper explores some strategies of incorporating advantages of low temperature co-fired ceramic (LTCC) technology into design and fabrication of low power high frequency DC/DC converters. High power density and high efficiency are two key factors for power modules. The development of new generation power switches with much less turn-on and turn-off time interval provides new chances for increasing...
For higher power density of power electronics converters, the integration of passive into the printed circuit board (PCB) is a low cost and integral manufacturing approach. The passive substrate concept for power electronics is proposed in this paper. Based on it, the converter level packaging can be implemented. The commercially available ferrite materials with low high frequency loss can be embedded...
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