Improvement of Stability in a PCM-Controlled Boost Converter with the Target Period Orbit-Tracking Method
1
School of Electric Power, South China University of Technology, Guangzhou 510641, China
2
School of Automation, Guangdong University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1432; https://doi.org/10.3390/electronics8121432
Received: 24 October 2019 / Revised: 23 November 2019 / Accepted: 27 November 2019 / Published: 30 November 2019
(This article belongs to the Special Issue Power Converters in Power Electronics)
Thee peak-current-mode (PCM) control strategy is widely adopted in pulse width-modulated (PWM) DC-DC converters. However, the converters always involve a sub-harmonic oscillating state or chaotic state if the active duty ratio is beyond a certain range. Hence, an extra slope signal in the inductor-current loop is used to stabilize the operation of the converter. This paper presents a new technique for enlarging the stable range of PCM-controlled DC-DC converters, in which the concept of utilizing unstable period-1 orbit (UPO-1) of DC-DC converters is proposed and an implementation scenario based on the parameter-perturbation method is presented. With the proposed technique, perturbations are introduced to the reference current of the control loop, and the converters operating in a chaotic state can be tracked, and thus be stabilized to the target UPO-1. Therefore, the stable operating range of the converters is extended. Based on an example of a PCM-controlled boost converter, simulations are presented as a guide to a detailed implementation process of the proposed technique, and comparisons between the proposed technique and techniques in terms of ramp compensation are provided to show the differentiation in the performance of the converter. Experimental results in the work confirm the effectiveness of the proposed technique.
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Keywords:
peak-current-mode (PCM) control; boost converter; stability; parameter perturbation; target period orbit tracking
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MDPI and ACS Style
Chen, Y.; Xie, F.; Zhang, B.; Qiu, D.; Chen, X.; Li, Z.; Zhang, G. Improvement of Stability in a PCM-Controlled Boost Converter with the Target Period Orbit-Tracking Method. Electronics 2019, 8, 1432.
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