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Multistage matching networks are often utilized to provide voltage or current gains in resonant conversion applications, such as large conversion ratio power converters and wireless power transfer. In the conventional approach, each stage of a multistage matching network is designed to have a purely resistive input impedance and assumed to be loaded by a purely resistive load. This paper introduces...
This paper presents a current controller for an automotive LED driver based on a zero-voltage switching (ZVS) Ćuk converter using planar integrated magnetics. The driver outputs regulated dc current through a string of N = 1–12 LED's, which implies the need to operate over a wide output voltage range (approximately 3–40 V). It is found that the low-frequency gain of the duty-cycle-to-output-current...
This paper presents a high-frequency zero voltage switching (ZVS) (Ćuk converter using planar integrated magnetics. The converter is intended for automotive LED driver applications. The converter switching frequency is above the AM frequency band to reduce radio frequency interference. The input inductor, the output inductor, and the transformer are realized on a single planar integrated magnetic...
This paper introduces a high-power-density high-efficiency isolated dc-dc converter based on the impedance control network (ICN) resonant converter architecture. The ICN converter maintains very high efficiency by achieving zero voltage switching (ZVS) and near zero current switching (ZCS) across a wide range of input voltages, output voltages and output power. High power density is achieved by combining...
Multistage matching networks are often utilized to provide voltage or current gains in applications such as wireless power transfer. Usually, each stage of a multistage matching network is designed to have a purely resistive input impedance and assumed to be loaded by a purely resistive load. This paper introduces an improved design optimization approach for multistage matching networks comprising...
This paper presents a monolithic multilevel converter realized in a depletion-mode GaN process and intended to operate as a drain supply modulator (DSM) for high efficiency radio-frequency (RF) power amplifiers (PAs). The custom prototype chip includes a four-level power stage with on-chip integrated gate drivers and damping networks designed to mitigate effects of parasitics during output voltage...
This paper presents a high-frequency zero voltage switching (ZVS) integrated-magnetics Ćuk converter well-suited for automotive LED-driver applications. Input inductor, output inductor and the transformer are realized on a single magnetic structure, resulting in very low input and output current ripples, thus reducing EMI and the need for an output filter capacitor. Furthermore, the converter switching...
This paper presents a high power density 2 kW single-phase inverter, with greater than 50 W/in3 power density and 90% line-cycle average efficiency. This performance is achieved through innovations in twice-line-frequency (120 Hz) energy buffering and high frequency dc-ac power conversion. The energy buffering function is performed using an advanced implementation of the recently proposed stacked...
This paper presents high efficiency de-de converters based on monolithic normally-off GaN half-bridge power stages with integrated gate drivers. A new gate driver circuitry is introduced, which enhances both the power stage efficiency and the converter overall efficiency. While using only n-type transistors in the GaN process, the proposed gate driver maintains low quiescent power consumption by emulating...
This paper introduces a very high frequency (VHF) capacitive wireless power transfer architecture capable of achieving very high power transfer densities and high efficiencies. High power density is achieved using an operating frequency of 100 MHz and through appropriate design of matching networks. High efficiency is achieved using a custom designed half-bridge GaN chip with integrated gate drivers...
This paper describes a very high frequency (VHF) isolated dc-dc resonant converter operating at 100 MHz switching frequency with a rated output power of 2 W. The power stage consists of two half-bridge GaN chips with integrated gate drivers, one operating as a dc-ac inverter on the primary side, the other operating as an ac-dc synchronous rectifier on the secondary side. Isolation is provided by a...
This paper describes a closed-loop regulated dual half-bridge series resonant de-de converter operated at up to 100 MHz switching frequency using GaN half-bridge stages with integrated gate drivers. A digital online efficiency optimization technique together with burst-mode control are developed and applied, to achieve output voltage regulation and efficiency improvements. An experimental prototype...
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