D. Ślęzak et al. (Eds.): CA 2009, CCIS 65, pp. 79–86, 2009.
© Springer-Verlag Berlin Heidelberg 2009
Terminal Sliding Mode Control of DC-DC Buck
Converter
Chian-Song Chiu
1,*
, Ya-Ting Lee
2
, and Chih-Wei Yang
1
1
Department of Electrical Engineering, Chung-Yuan Christian University,
Chung-Li 32023, Taiwan
cschiu@dec.ee.cycu.edu.tw
2
Department of Beauty Science, Chienkuo Technology University,
Changhua 500, Taiwan
ytlee@ctu.edu.tw
Abstract. This paper presents a novel sliding mode control for DC-DC buck
converter. Our study is motivated by the output regulation problem of DC-DC
converters with varying load and inaccuracy passive elements. In order to
achieve stable output voltage, a terminal sliding mode controller (TSMC) is
proposed. Different to traditional sliding mode control, a terminal sliding
surface is introduced to assure finite convergent time of control errors on the
surface. In addition, due to unknown bound of uncertainty, an adaptive law is
derived to compensate the effect. As a result, the TSMC is modified to adaptive
TSMC (ATSMC). Furthermore, this controller is implemented by a DSP card.
Form the simulation and experiment results, the proposed control scheme is
shown to be feasible.
Keywords: DC-DC converter, uncertainty, terminal sliding mode control.
1 Introduction
The main control method in the switching power converter is associated with a pulse
width modulation (PWM) [1, 2, 3]. The controlled PWM signal drives the transistor
to maintain a constant output voltage, where the duty cycle of the PWM signal is
adjusted by the controller. To this end, many control methods have been used, such as
PID [4], fuzzy control [5], H
∞
control [6], feedback linearization [7], etc.
Since the sliding mode control has good robustness to system parameter uncertainty
and external interference [8], the sliding mode control is widely used in various fields.
Many application examples are discussed in literature [9, 10]. For example, in electric
fields [11], the sliding mode control is used to inverter, dc motor, induction motor,
permanent magnet synchronous motor, etc. The sliding mode control is also applied to
power converters [12, 13]. In the classical sliding mode control method usually chooses
a linear sliding function to obtain an exponentially stable manifold. In contrast, the work
[14] proposed a special terminal sliding mode. Different from the classical sliding mode
control, the terminal sliding mode control (TSMC) has a nonlinear sliding function. The
*
Correspondence addressee.
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