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JPE, Vol. 19, No. 4, July 2019 
DesignOriented Stability of Outer Voltage Loop in Capacitor Current Controlled Buck Converters
Xi Zhang, Zhongwei Zhang, Bocheng Bao, Han Bao, Zhimin Wu, Kaiwen Yao, and Jing Wu

Area 
Low Power Converters 
Abstract 
Due to the inherent feedforward of load current, capacitor current (CC) control shows a fast transient response that makes it
suitable for the power supplies used in various portable electronic devices. However, considering the effect of the outer voltage
loop, the stable range of the dutycycle is significantly diminished in CC controlled buck converters. To investigate the stability
effect of the outer voltage loop on buck converters, a CC controlled buck converter with a proportionintegral (PI) compensator
is taken as an example, and its secondorder discretetime model is established. Based on this model, the instability caused by the
dutycycle is discussed with consideration of the outer voltage loop. Then the dynamical effects of the feedback gain of the PI
compensator and the equivalent series resistance (ESR) of the output capacitor on the CC controlled buck converter with a PI
compensator are studied. Furthermore, the designoriented closedloop stability criterion is derived. Finally, PSIM simulations
and experimental results are supplied to verify the theoretical analyses. 
Keyword 
Buck converter,Capacitor current (CC) control,Outer voltage loop,Stability 
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