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To overcome the drawbacks of the conventional gate drive, in this paper a closed-loop gate control method is proposed. In this novel method, the switching speed, specifically di/dt, is measured from the voltage across the parasitic inductance of the IGBT module and a closed-loop control is employed to adaptively adjust the gate drive voltage to control the switching speed according to a preset control...
In order to adhere to voltage regulation criteria, capacitor selection of a Buck converter must be based on the worst possible scenario. It is well known that, for a low duty cycle Buck converter, the output voltage deviation of a Buck converter undergoing an unloading transient will be significantly larger than that of a corresponding loading transient of equal magnitude. Therefore, in this paper,...
The voltage mode control (VMC) technique of switchmode converters has been widely used in renewable PV system applications. The feasibility of the current mode control (CMC) techniques in PV applications is also promising because of the irregular nature of the PV source. This paper presents a comparative assessment of the VMC and four different CMCs of switch-mode converters for photovoltaic (PV)...
Controlled switching taking into account the residual flux can - in theory - completely eliminate transient transformer inrush currents. Real factors such as closing time scatter of the circuit breaker and uncertainty in the residual flux measurement significantly reduce its performance in the field. To quantify the acceptable tolerances of these factors if no inrush currents have to occur, a systematic...
Constant-frequency and variable-frequency digital peak current control techniques are introduced in this paper. To overcome time delay problem of previous digital peak current (DPC) control in constant switch frequency, two new algorithms are proposed and studied. One is an improved digital peak current (IDPC) control algorithm in constant switch frequency and the other is a variable-frequency digital...
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