Dissertation
Hybrid DC-DC VOLTAGE Converters For High-Performance Power Conversion System
Washington State University
Doctor of Philosophy (PhD), Washington State University
2023
DOI:
https://doi.org/10.7273/000005320
Abstract
With the rapid evolution of the complementary metal-oxide-semiconductor (CMOS) technology, pushing the power supplies of low-voltage cores down to the sub-volt range. Hybrid DC-DC voltage regulators (VRs) are more favorable to meet the growing demand for efficient power conversion system with the benefits of more compact form factor, more extreme conversion ratios, while also providing fast response.
In this dissertation, three different hybrid VRs with unique characteristics are presented to generate power supplies for high-performance functional circuit cores. The first work is an inductor-first single-inductor-multiple-output (SIMO) hybrid DC-DC converter with integrated flying capacitor for system-on-chip (SoC) applications. It overcomes the challenging output voltage range issues induced by the inductor-first hybrid topology while improving power efficiency and fast response. This is realized by using an on-chip switched-capacitor power stage (SCPS) with a dual-switching frequency technique under a 500MHz system clock to achieve approximately full output voltage range and a less than 0.01mA/mV cross-regulation. The second work is a reconfigurable hybrid converter with high voltage conversion ratio (VCR) for sub-1V outputs in battery/USB input applications, using a nominal CMOS technology. The converter utilizes a switched-capacitor cell with inductor directly connected to the input, supporting a maximum VCR of 9 with a relaxed duty cycle of pulse width modulation (PWM) signal. Finally, the third work is a SIMO step-down hybrid converter for 12V power systems in industrial and automotive applications. It incorporates minimized number of flying capacitors with quadratically self-balanced voltages to support an extremely high VCR up to 32. In addition, a dynamic switching frequency technique is employed to improve the response speed. Moreover, the proposed converter incorporates a reversed-duty-cycle technique that contributes an enhanced overall efficiency and extended effective
duty-cycle range.
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Details
- Title
- Hybrid DC-DC VOLTAGE Converters For High-Performance Power Conversion System
- Creators
- Zhiyuan Zhou
- Contributors
- Deuk Hyoun Heo (Advisor)Partha Pratim PPP Pande (Committee Member)Dae Hyun DHK Kim (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- School of Electrical Engineering and Computer Science
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 112
- Identifiers
- 99901031440901842
- Language
- English
- Resource Type
- Dissertation