Optimized design of GaN switching capacitor based envelope tracking power supply for satellite applications

Jin, Qian; Vasić, Miroslav; García, O.; Alou, P.; Oliver, J. A.; Cobos, J.A.

doi:10.1109/apec.2016.7468203

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…The phases can be laid out in parallel on a single board [18], or stacked up vertically [19] which yields very high power density circuits. We chose to adopt the use of the synchronous interleaved boost converter because this design is straightforward to implement, capable of facilitating regenerative breaking, and increasing power capacity by simply adding more phases [12]. Without bidirectional current flow, when the motor stops and the energy stored in motor winding returns, the output capacitor voltage surges until the capacitors and the switching devices ultimately fail, unless an additional switch can dump the excess energy through a physically-large resistor.…”

Section: Boost Stagementioning

confidence: 99%

“…The chosen design employs a battery-powered boost converter to energize a 3-level inverter. Inspired by electric vehicles' battery boosted motor drives [12] and cascaded interleaved boost converters for high step-up conversion ratio [13], the proposed design combines these two patterns in order to construct a compact pulsed power system for NFJI. Although (b) An overview of the different sub-systems inside the portable power system.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Portable Pulsed Power System for Needle-Free Jet Injection

Nick

Taberner

Ruddy

2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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Needle-free jet injection (NFJI) is a drug delivery technique that requires the application of a brief (10 ms to 100 ms) pulse of high force to pressurize a liquid drug and force it through the skin. To provide control over this force using an electric motor, high drive power is needed from a compact system. This work outlines the design process of an untethered power and motor drive system that is estimated to weigh approximately 2.5 kg, capable of supplying 1.6 kW at 210 V peak-peak. The device is used to drive a linear synchronous motor to deliver up to 31 large volume (1 mL) needle-free jet injections (NFJI) within a single recharge. The system architecture, gathering of detailed functional requirements, selection of energy storage, and the studies of power electronics and motor drive via system simulation are discussed. Inspired by electric vehicles' battery boosted motor drives and cascaded interleaved boost converters for high step-up conversion ratio, the proposed design employs a battery-powered boost converter which then energize a 3-level inverter with the peak to peak voltage of 210 V. The design utilizes the latest gallium nitride (GaN) transistors as well as the latest lithium-ion capacitors (LIC) for energy storage. The power electronic topology introduced in this work is also adaptable for other high energy pulsed applications such as plasma generation, or MRI gradient coils.

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Section: Boost Stagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a Portable Pulsed Power System for Needle-Free Jet Injection

Nick

Taberner

Ruddy

2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…The advantage of this converter is the high efficiency, especially when GaN transistors are used [6]. High efficiency is associated with low prototype volume, due to the thermal issues, also allowing low occupied space and low weight.…”

Section: B Multilevel Convertermentioning

confidence: 99%

“…All these advantages make this converter convenient to use in applications with critical volume and weight. The second advantage is the possibility to modulate two of its output voltages, by the means of duty-cycle d, which can be used in the optimization process of overall envelope tracker, as explained in [6]. Linear power supplies with series transistor are suitable due to its simplicity.…”

Section: B Multilevel Convertermentioning

confidence: 99%

A comparative analysis of two approaches in EER based envelope tracking power supplies

Lazarevic

Vasić

García

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In modern telecommunication systems, the requirements for amount of transmitted data are increasing rapidly. For a better spectral efficiency complex type modulations (QAM, OFDM) are used, resulting in high PAPR signals. As a consequence, if conventional linear amplifiers (classes A, B) are used in transmitters, prominent linearity, but poor efficiency are assured. The efficiency of the transmitters can be significantly improved using some of the popular techniques: Kahn EER technique, ET technique, Doherty amplifier, Chireix's amplifier. In this paper, two different approaches in supplying power amplifier based on EER technique are presented. The same part of both envelope amplifiers (EA) is switched-capacitor based voltage divider combined with switching structure, analog multiplexer. The analog multiplexer is assisted with series linear regulator, in the first system, and with a fourth order LC filter, in the second system. Two prototypes for 10 W average output power with about 40 W peak output power are fabricated and the experimental results are compared in terms of efficiency and signal quality.

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“…A similar challenge exists for Radio Frequency (RF) power amplifiers where highly dynamic radio signals cause low efficiency [7]- [9]. To overcome this challenge within RF power amplifiers several methods have been proposed including Envelope Tracking (ET) and Envelope Elimination and Restoration (EER) [10]- [13].…”

mentioning

confidence: 99%

Multilevel tracking power supply for switch-mode audio power amplifiers

Iversen

Lazarevic

Vasić

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Switch-mode technology is the common choice for high efficiency audio power amplifiers. The dynamic nature of real audio reduces efficiency as less continuous output power can be achieved. Based on methods used for RF amplifiers this paper proposes to employ envelope tracking techniques to the power supply in order to improve efficiency. A 100 W prototype system was designed. Measured results show that systems employing envelope tracking can improve system efficiency from 2% to 12%, i.e. a factor of 6. The temperature rise is strongly reduced, especially for the switching power MOSFETs where it is halved from 100• C to 50• C.

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Optimized design of GaN switching capacitor based envelope tracking power supply for satellite applications

Cited by 4 publications

References 14 publications

Design of a Portable Pulsed Power System for Needle-Free Jet Injection

Design of a Portable Pulsed Power System for Needle-Free Jet Injection

A comparative analysis of two approaches in EER based envelope tracking power supplies

Multilevel tracking power supply for switch-mode audio power amplifiers

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