<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></abstract>

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.

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

Department of Electrical Energy, Systems and Automation

Department of Electronics and microelectronics

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

A fast and reliable current control is often the base of power electronic converters. The traditional constant frequency peak control is unstable above 50 %...

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

Published Online: Nov 28, 2017

Page range: 390 - 395

Received: Mar 07, 2017

DOI: https://doi.org/10.1515/jee-2017-0072

Keywords
analog processing circuits, circuit analysis, circuit simulation and modelling, current control, PV conversion

© 2017 Alex Van den Bossche et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

Published Online: Nov 28, 2017

Page range: 390 - 395

Received: Mar 07, 2017

DOI: https://doi.org/10.1515/jee-2017-0072

Keywordsanalog processing circuits, circuit analysis, circuit simulation and modelling, current control, PV conversion

© 2017 Alex Van den Bossche et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
analog processing circuits, circuit analysis, circuit simulation and modelling, current control, PV conversion