Andreas Franke’s research while affiliated with Netherlands Space Office and other places

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Publications (4)


Corrections to “Sequential Switching Shunt Regulation Using DC Transformers for Solar Array Power Processing in High Voltage Satellites”
  • Article

December 2024

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3 Reads

IEEE Transactions on Aerospace and Electronic Systems

Carlos Orts

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David Marroquí

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Andreas Franke

In [1], (A.7) and (A.8) are corrected as follows: \begin{align*} {{L}_m} &\approx 170\ \mu \mathrm{H}\\ {{C}_{TR}} &\approx 200\ \text{pF}\\ {{L}_{lk}} &\approx 650\ \text{nH}. \tag{A.7} \end{align*}


Figure 7. Experimental 2s2p S3DCX. Top: Distribution bus voltage (AC Coupled). Bottom: Solar Array Section voltage.
250 V-45 A Si MOSFETs in space qualified (top) and commercial equivalent (bottom) after derated ratings.
Summary of commercial 1.2 kV-10 A SiC Schottky diodes. In grey, 150 V-20 A space-qualified Si Schottky diode for comparison.
SAS and DCX design parameters.
Enabling High-Power Conditioning and High-Voltage Bus Integration Using Series-Connected DC Transformers in Spacecrafts
  • Article
  • Full-text available

August 2024

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24 Reads

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1 Citation

Aerospace

Carlos Orts

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David Marroquí

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[...]

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Andreas Franke

This article proposes a photovoltaic power processor for high-voltage and high-power distribution bus, between 300 V and 900 V, to be used in future space platforms like large space stations or lunar bases. Solar arrays with voltages higher than 100 V are not available for space application, being necessary to apply power conversion techniques. The idea behind this is to use series-connected zero-voltage and zero-current unregulated and isolated DC converters to achieve high bus voltage from the existing solar arrays. Bus regulation is then achieved through low-frequency hysteretic control. Topology description, semiconductor selection, design procedure, simulation and experimental validation, including tests in vacuum and partial pressures, are presented.

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Sequential Switching Shunt Regulation Using DC Transformers for Solar Array Power Processing in High Voltage Satellites

January 2023

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53 Reads

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6 Citations

IEEE Transactions on Aerospace and Electronic Systems

This paper proposes a solar array regulation technique for a high-voltage satellite power bus. The regulation method combines on-off control at low frequency, i.e. kHz range, of highly efficient isolated and unregulated dc-dc converters operating at high frequency, i.e. hundreds of kHz. Although this technique can adopt different implementations, this paper deals with a hysteretic voltage control loop at low frequency, also known (Sequential Switching Shunt Regulator - S3R), and unregulated, isolated, current-fed, zero-voltage and zero-current push-pull dc-dc converters. Design guidelines and experimental validation are provided.

Citations (2)


... The responsibility of carrying out space missions was mainly under the jurisdiction of powerful space agencies such as NASA, ESA, CNSA, JAXA, ROSCOSMOS, and ISRO. These space research organizations, being governmental institutions, carried out societal functions such as being carriers of knowledge and education and promoting advanced technology [3]. With the passage of time, many universities and SMEs (Small/Medium Enterprises) emerged and entered this market with the objective of organizing space missions at a fraction of the cost, accepting the failure risk in space exploration due to cheaper production and shorter development periods [4]. ...

Reference:

Efficient Power Conditioning: Enhancing Electric Supply for Small Satellite Missions
Enabling High-Power Conditioning and High-Voltage Bus Integration Using Series-Connected DC Transformers in Spacecrafts

Aerospace

... The power transfer from the source to the batteries and loads uses either the Direct Energy Transfer (DET) or Maximum Power-Point Tracking (MPPT) architectures [23,36,[39][40][41][42][43][44][45][46]. Figure 5c,d show these architectures, respectively [47,48]. While the MPPT architecture is used in low-and medium-power LEO satellites and interplanetary missions using unregulated bus systems, the DET is widely used in medium-and high-power GEO satellites using fully regulated bus architectures [49]. Two basic design approaches are used for distributing power: distributed power and decentralized power architectures [50]. ...

Sequential Switching Shunt Regulation Using DC Transformers for Solar Array Power Processing in High Voltage Satellites

IEEE Transactions on Aerospace and Electronic Systems