Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 3, Pages 2539-2549Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2431193
Keywords
DC-DC converter; digital control; second-order sliding-mode (SOSM) control; state-machine; voltage feedback
Categories
Funding
- National Natural Science Foundation of China [61203097]
- China Postdoctoral Science Foundation [2013T60840, 2012M511907]
- Fundamental Research Funds for the Central Universities in China [106112013CDJZR170003]
- AQSIQ Science and Technology Projects [2012IK029]
- Chongqing Application Development Plan Project in China [CSTC2014YYKFA80017]
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In this paper, second-order sliding-mode (SOSM) control approach is applied to synchronous buck dc-dc converters. The proposed SOSM controller can stabilize synchronous buck dc-dc converters using a simple digital state-machine structure, without requiring current sensing or an integral term in the control loop. The SOSM controller results in fast step-load and start-up transient responses, and is robust against parameter uncertainties. Fast transients and current limitation during start up can be accomplished by adjusting one controller parameter. Furthermore, a hysteresis method is introduced to control the switching frequency. The proposed approach is verified by experimental results on a 1.25-V 10-A prototype.
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