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A single-inductor dual-output (SIDO) buck converter with adaptive freewheel current and hybrid mode control is presented in this paper. It operates in pseudo-continuous conduction mode (PCCM) with single freewheel phase to reduce switching loss and minimize cross regulation. Freewheel current adjustment is implemented by detecting and control freewheel time, which can extend the load range and improve...
This paper presents a method to analyze the dynamic physical limits of a phase-shifted full bridge (PSFB) circuit used for the power supply of Magnetic Resonance Imaging (MRI) gradient amplifiers. Based on the time-optimal control theory, the detailed optimal transient response process under a sudden load current change is analyzed considering the sample time delay, the minimum voltage undershoot...
Renewable energy sources are widely used in microgrid. Output voltage of them is often low and varies widely. Because diodes in three-level legs in traditional three-level (TL) converter are substituted by MOSFETs, the push-pull forward (PPF) TL converter is very suitable for wide and low input-voltage applications. It can operate at two-level and three-level modes. Modeling of the proposed converter...
This paper analyzed operation characteristics of 5L-ANPC converters under device open failure conditions and proposed fault tolerant control schemes for single and multiple device open failures. Simulation results validated the analysis and control schemes, which allow the converter to continue operating to provide balanced three-phase currents during fault tolerant operation.
In this paper, the operation characteristics of five-level active-neutral-point-clamped (5L-ANPC) inverters under device short failure conditions are analyzed. A new fault tolerant control scheme is proposed, which enables continuous operation and generating three-phase sinusoidal currents of 5L-ANPC inverters. The remaining redundant voltage vectors can still be utilized to improve operating performance...
Vacuum switch as a great potential for development of new power switch, in the low voltage level has a strong advantage, but to the development of high-voltage level encountered a relatively large resistance. This paper provides a kind of phase selection function, photoelectric control, with multi-take energy operate the power system, with permanent magnetic actuator of the modular smart vacuum switch...
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