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The unprecedented proliferation of electronic devices in critical applications, such as smart grid and communication systems, has brought new challenges in system reliability. Electronic circuits and components are especially sensitive to transient overvoltages and lightning surges, and design must consider operation under these worst case situations. To address these transients, Metal Oxide Varistors...
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...
The Fast Field Cycling Nuclear Magnetic Resonance (FFC-NMR) technique has been spreading its application to new areas such as oil and food industry. Consequently, new features and improvements concerning the equipment available has been investigated and exploited. Under this context, this paper describes the main aspects concerning the electromagnetic and thermal behavior of the main power supply...
The paper is devoted to the features of short-circuit current interruption under the conditions of small-scale distributed synchronous generation connection to medium voltage (MV) and low voltage (LV) power supply systems. Distributed generation (DG) even in a case of the unidirectional power supply has a great impact on overcurrent relay protection sensitivity and selectivity. Connecting DG leads...
The point of load (POL) is a power supply, supplies a “low voltage and large current” power to a digital processor application. Digital load current changes very quickly, therefore, a fast transient response is required for POL. In case of the digital controlled POL, “conversion time delay” on the ADC and “internal calculation time” deteriorates its performance. As a result, the output voltage of...
The EAST superconducting tokamak is an advanced steady state experimental device being built at ASIPP in China from 2000 to around 2006. The paper gives a description for the power supply (PS) of poloidal field (PF) in EAST. Design and test results for the thyristor switch network are emphasized with transient analyses.
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