PWM-Based Sliding Mode Controller for Three-Level Full-Bridge DC-DC Converter that Eliminates Static Output Voltage Error

Abstract

This paper proposes a pulse width modulation (PWM)-based sliding mode controller (SMC) for a full-bridge DC-DC converter that can eliminate static output voltage error. Hysteretic SMC in DC-DC converter does not have a fixed switching frequency, and applying hysteretic SMC to full-bridge converters is difficult. Fixed-frequency SMC, which is also called PWM-based SMC, based on equivalent control overcomes these shortcomings. However, the controller order reduction in equivalent control in PWM-based SMC causes static output voltage error. To resolve this issue, an integral item is added to the PWM-based SMC. Sliding mode coefficients are designed by applying a standard second-order system to the sliding mode surface. The effect of adding an integral item on the controller is analyzed, and an integral coefficient design method is proposed. Experiment results on a three-level full-bridge DC-DC converter verify the control scheme and design method proposed in this paper.

An Anti-Interference Control Method for an AGV-WPT System Based on UIO-SMC

“…In [24], the author analyzed the relationship between damping ratio, overshoot, and response time, and generally selected ζ = 0.4-0.8; this paper selects ζ = 0.6. The attenuation coefficient τ represents the dynamic response of the controller, which is mainly determined by the system power level and switching frequency [25]. If τ is too large, the system response time will be longer.…”

Control Method for Phase-Shift Full-Bridge Center-Tapped Converters Using a Hybrid Fuzzy Sliding Mode Controller

“…This is applied to the input of the SMC and a sliding plane of the SMC is obtained by the e V . Since the sliding plane is an important variable that determines the control performance of the SMC, it is designed by various forms suitable for each system [19,[22][23][24]. In this paper, it was designated as Surface, which is designed with the e V and its integral term as Equation 3.…”

“…It has a fast-dynamic characteristic and is robust for the disturbance. However, when a gain of the SMC is increased to improve the dynamic characteristic, the output voltage ripple is increased by the chattering problem [19][20][21][22][23][24]. Therefore, it is important to set an appropriate gain of the SMC, which can reduce the output voltage ripple.…”