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Multiple-Output DC-DC Converters with a Reduced Number of Active and Passive Components

Department of Electrical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
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J. Low Power Electron. Appl. 2019, 9(3), 28; https://doi.org/10.3390/jlpea9030028
Received: 25 July 2019 / Revised: 17 August 2019 / Accepted: 11 September 2019 / Published: 18 September 2019
Multiple-output converters have been widely used where individual outputs are required. Compared with conventional separate converters, the advantage of multiple outputs is to have a lower number of active and passive components. In this paper, first, a pulse-width-modulation (PWM)-pulse-frequency-modulation (PFM) method is used for two-output converters that have only one coil and one active switch. Secondly, three-output converter topologies are proposed where the third output is controlled by phase delay (PD). These converters need only two coils and two active switches to regulate three outputs. How to obtain PD at different switching frequencies is discussed next, and a PWM-PFM-PD controlled five-output buck converter is presented. The proposed solution uses only two active switches and two magnetic cores to adjust five-output voltages independently. A modeling and digital control method are proposed in order to regulate the five output voltages. A prototype circuit with independent 15 V/1.5 A, 12 V/1.5 A, 5 V/0.8 A, −5 V/0.6 A and 3.3 V/0.45 A outputs is assembled to validate the analysis, and it was proved that it regulates the output voltages at different loads. View Full-Text
Keywords: multiple-output converter; dc-dc converter; cross regulation; PWM-PFM; PWM-PD; PWM-PFM-PD multiple-output converter; dc-dc converter; cross regulation; PWM-PFM; PWM-PD; PWM-PFM-PD
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Turhan, M.; Castellanos, J.C.; Hendrix, M.A.M.; Duarte, J.L.; Lomonova, E.A. Multiple-Output DC-DC Converters with a Reduced Number of Active and Passive Components. J. Low Power Electron. Appl. 2019, 9, 28.

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