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Energies 2018, 11(10), 2560; https://doi.org/10.3390/en11102560

Control of the Bidirectional Buck-Boost Converter Operating in Boundary Conduction Mode to Provide Hold-Up Time Extension

1
Facultad de Ingeniería, Universidad de Ibagué, Carrera 22 Calle 69 Barrio Ambalá, Ibagué 730001, Colombia
2
SERMA Ingénierie, 3 Impasse Marcel Chalard, 31110 Toulouse, France
*
Author to whom correspondence should be addressed.
Received: 11 September 2018 / Revised: 20 September 2018 / Accepted: 21 September 2018 / Published: 26 September 2018
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PDF [4186 KB, uploaded 26 September 2018]
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Abstract

A hold-up time extension circuit (HTEC) is used to charge and discharge an auxiliary capacitor. This capacitor stores the energy required to extend the operation time of critical loads experiencing short duration failures (SDF) at the DC bus to which they are connected. This paper presents complete modeling and a control-wise approach to a parallel HTEC based on the bidirectional buck-boost converter, which operates in Boundary Conduction Mode (BCM) with a variable switching frequency. The circuit permanently regulates the voltage of the auxiliary capacitor as well as the voltage of the DC bus during SDF, which is uncommon in industrial versions of HTEC. Enforcing the operation in BCM allows a reduction in the size of the inductor in the converter without requiring additional control circuitry. The entire behavior of the proposed HTEC, in all its operation modes, was analyzed theoretically and validated using simulation and experimental results, showing the potential of the circuit to be used in real applications. View Full-Text
Keywords: hold-up time extension; bidirectional buck-boost converter; boundary conduction mode; hysteresis current control hold-up time extension; bidirectional buck-boost converter; boundary conduction mode; hysteresis current control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lopez-Santos, O.; Urrego-Aponte, J.O.; Tilaguy-Lezama, S.; Almansa-López, J.D. Control of the Bidirectional Buck-Boost Converter Operating in Boundary Conduction Mode to Provide Hold-Up Time Extension. Energies 2018, 11, 2560.

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