Providing reliable and efficient operation of electronic devices often requires introducing of an additional protection from electric circuit parasitic components during the design stage. The paper analyzes the influence of a parasitic inductance on overvoltage at switching elements, which is an unavoidable part of the most electronic converters. The paper also describes the basic methods for avoiding this phenomenon. One example of an overvoltage protection of IGBT transistors based on TD350 control circuit is presented for a specific converter.

This paper presents design and development process of software solution for the control, acquisition and analysis of the dynamic resistance measurement results for high voltage circuit breaker analyzer devices. Five years' experience in algorithms and software development for the circuit breaker analyzer control and data acquisition and circuit breaker analyzer itself has been summarized in this paper.

This paper gives one possible application of Ćuk converter for telecommunication equipment power supply. Ćuk converter is controlled with cascade control system, with two regualtion loops, outer loop is voltage PI control loop and inner loop is current SMC (Sliding Mode Control) controlled loop. The control system also has input inductor current limiter, which is necessary in cases of large input currents. Simulation results show good control in cases of input voltage test signals with high frequency ripple and slow changes.

This paper presents a design of a digital direct power control strategy for a three-phase grid-connected inverter combining the discrete-time sliding mode control and the space vector modulation. Using the discrete-time state-space model of the controlled system, a discrete-time sliding mode control system is designed. Its output is a control vector which minimizes the instantaneous active and reactive power displacement from their reference values. The control vector is computed from the samples of voltages and currents and then converted to a switching sequence using space vector modulation. The period of modulated signal is equal to the sample period. A correction of the control vector is defined with aim to eliminate the influence of the system uncertainties using predicted values of the active and reactive powers. In this way a robust control system with a constant switching frequency is designed. Its digital hardware implementation is very simple. This control system is tested on a simulation model and compared with other similar approaches.