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Energies 2018, 11(12), 3478; https://doi.org/10.3390/en11123478

An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM

1
Harbin Institute of Technology Shenzhen Graduate School; Shenzhen 518055, China
2
Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China
3
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Received: 16 November 2018 / Revised: 2 December 2018 / Accepted: 10 December 2018 / Published: 13 December 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper presents an Optimized Sensorless Charge Balance (OSCB) controller based on a damped current model for flyback converter operating in Discontinuous Conduction Mode (DCM). By solving total differential equations of non-ideal transformer currents, the damped current model is derived with consideration of parasitics, leakage inductance of transformer, and the Resistor-Capacitor-Diode (RCD) snubber circuit. Based on the proposed model, current observation and control algorithms of the Sensorless Charge Balance (SCB) controller are optimized, which forms the OSCB control strategy. The average current damping is considered in the equivalent discrete-time small signal model. Furthermore, frequency analyses show that OSCB controller achieves higher closed-loop bandwidth and lower overshoot than a SCB controller, which indicates an improved transient performance. Finally, both OSCB and conventional SCB controllers are experimentally evaluated on a flyback converter prototype. View Full-Text
Keywords: DC-DC converter; flyback; sensorless; DCM; Charge balance control DC-DC converter; flyback; sensorless; DCM; Charge balance control
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Zhang, X.; Min, R.; Zhang, D.; Wang, Y. An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM. Energies 2018, 11, 3478.

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