A simplified controller and detailed dynamics of constant off-time peak current control

A fast and reliable current control is often the base of power electronic converters. The traditional constant frequency peak control is unstable above 50 % duty ratio. In contrast, the constant off-time peak current control (COTCC) is unconditionally stable and fast, so it is worth analyzing it. An...

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Bibliographic Details
Published in:Journal of Electrical Engineering 2017-09, Vol.68 (5), p.390-395
Main Authors: Van den Bossche, Alex, Dimitrova, Ekaterina, Valchev, Vencislav, Feradov, Firgan
Format: Article
Language:English
Subjects:
Analog circuits
analog processing circuits
circuit analysis
circuit simulation and modelling
Converters
current control
Integrated circuits
PV conversion
Transfer functions
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Summary:A fast and reliable current control is often the base of power electronic converters. The traditional constant frequency peak control is unstable above 50 % duty ratio. In contrast, the constant off-time peak current control (COTCC) is unconditionally stable and fast, so it is worth analyzing it. Another feature of the COTCC is that one can combine a current control together with a current protection. The time dynamics show a zero-transient response, even when the inductor changes in a wide range. It can also be modeled as a special transfer function for all frequencies. The article shows also that it can be implemented in a simple analog circuit using a wide temperature range IC, such as the LM2903, which is compatible with PV conversion and automotive temperature range. Experiments are done using a 3 kW step-up converter. A drawback is still that the principle does not easily fit in usual digital controllers up to now.
ISSN:1339-309X
1335-3632
1339-309X
DOI:10.1515/jee-2017-0072