Low Power Very High Frequency Switch-Mode Power Supply With 50 V Input and 5 V Output

Madsen, Mickey P.; Knott, Arnold; Andersen, Michael A. E.

doi:10.1109/tpel.2014.2305738

Cited by 39 publications

(18 citation statements)

References 35 publications

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“…10 is the L MR -C MR series branch which is tuned to be resonant near the second harmonic of the switching frequency, thus suppressing second harmonic content in the drain voltage and providing a quasi-trapezoidal drain voltage waveform. F 2 inverters are useful in very highfrequency dc-dc converters, for example [39,[46][47][48][49]. Fig.…”

Section: Circuit Transformation Of a  2 Invertermentioning

confidence: 99%

Design of Single-Switch Inverters for Variable Resistance/Load Modulation Operation

Rosłaniec

Jurkov

Bastami

2015

IEEE Trans. Power Electron.

129

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Abstract-Single-switch inverters such as the conventional class E inverter are often highly load sensitive, and maintain zero-voltage switching over only a narrow range of load resistances. This paper introduces a design methodology that enables rapid synthesis of class E and related single-switch inverters that maintain ZVS operation over a wide range of resistive loads. We treat the design of Class-E inverters for variable resistance operation and show how the proposed methodology relates to circuit transformations on traditional class E designs. We also illustrate the use of this transformation approach to realize  2 inverters for variable-resistance operation.The proposed methodology is demonstrated and experimentally validated at 27.12 MHz in a class E and  2 inverter designs that operate efficiently over 12:1 load resistance range for an 8:1 and 10:1 variation in output power respectively and a 25 W peak output power.

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Section: Circuit Transformation Of a  2 Invertermentioning

confidence: 99%

Design of Single-Switch Inverters for Variable Resistance/Load Modulation Operation

Rosłaniec

Jurkov

Bastami

2015

IEEE Trans. Power Electron.

129

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“…The voltage stress equals to the input voltage which allows the usage of higher speed, lower voltage devices [36], [38]. To control two switches, precise design of the gate driver circuitry is needed to avoid cross conduction through the switches which may cause catastrophic failure.…”

Section: Introductionmentioning

confidence: 99%

“…To control two switches, precise design of the gate driver circuitry is needed to avoid cross conduction through the switches which may cause catastrophic failure. Other inverter topologies involve extra circuit components to solve the problem of high voltage stress on the switches [34], [36].…”

Section: Introductionmentioning

confidence: 99%

Microfabricated Air-Core Toroidal Inductor in Very High-Frequency Power Converters

Thanh

Nour

Han

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-Miniaturization of power supplies is required for future intelligent electronic systems e.g. internet of things devices. Inductors play an essential role, and they are by far the most bulky and expensive components in power supplies. This paper presents a miniaturized microelectromechanical systems (MEMS) inductor and its performance in a very high frequency (VHF) power converter. The MEMS inductor is a siliconembedded air-core toroidal inductor, and it is constructed with through-silicon vias, suspended copper windings, silicon fixtures, and a silicon support die. The air-core inductors outperform the silicon-core inductors with higher quality factor at higher frequency. This is verified by small-signal measurements. A 20-turn air-core inductor achieved an inductance of 44.6 nH and a quality factor of 13.3 at 33 MHz, while a silicon-core inductor with the same geometry has a quality factor of 9 at 20 MHz. A DC-DC class-E boost converter is designed and implemented using the fabricated MEMS air-core inductor and a highperformance 65 V gallium nitride field effect transistor. The VHF converter achieved a peak efficiency of 78 % at the input voltage of 6.5 VDC. The MEMS inductor can carry 1 A RMS AC current at 33 MHz and delivers 10.5 W to the output.Index Terms-Microelectromechanical systems, inductor, DC-DC power converters, zero voltage switching, gallium nitride.

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“…Whereas [10], [14], [16], [17], [29] use the Class-E topology to avoid high-side switches and therefore come with a high voltage stress across the power semiconductor, [30], [31] document the Class-DE topology and its corresponding highside gate driver [32], [33] as alternative. Within the currentdriven Class-DE rectifier family, Fig.…”

Section: Introductionmentioning

confidence: 99%

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

Jensen

Spliid

Hertel

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standards, AirFuel and Qi, exist to support compatibility between devices. This work is focusing on the AirFuel standard, as it is operating at a higher frequency (6.78 MHz), than the Qi standard, and therefore allows smaller passive components, including the coupling coils. Whereas gallium-nitride (GaN) devices are being widely used on the transmitter (Tx) side, this work uses low voltage GaN transistors on the receiver (Rx) side to allow synchronous rectification and soft switching, thereby achieving high efficiency. After analyzing adequate Class-DE rectifier topologies, a Class-DE full-bridge 5 W rectifier using 15 V GaN transistors are designed and implemented. The experimental results show an efficiency above 80 % over a wide operating range and a peak efficiency of 89 %, at an arbitrary alignment of Tx and Rx coils with 3 cm distance between them.

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Low Power Very High Frequency Switch-Mode Power Supply With 50 V Input and 5 V Output

Cited by 39 publications

References 35 publications

Design of Single-Switch Inverters for Variable Resistance/Load Modulation Operation

Design of Single-Switch Inverters for Variable Resistance/Load Modulation Operation

Microfabricated Air-Core Toroidal Inductor in Very High-Frequency Power Converters

Resonant full-bridge synchronous rectifier utilizing 15 V GaN transistors for wireless power transfer applications following AirFuel standard operating at 6.78 MHz

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