Mor Mordechai Peretz

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—The conditions for limit-cycle oscillations in digitally controlled resonant converters are explored theoretically and are tested by simulation and experiment. The analytical analysis reveals that in a manner similar to digital pulsewidth modulation (PWM) control, limit cycles occur in such systems when the LSB of the control changes the output by a value(More)
— The concept of Envelope Impedance (EI) was used to develop a systematic and simple approach for studying the conditions for stability of PT-CCFL systems. It was found that the EI of PTs includes minimum points at low frequency when the EI of the CCFL is negative. This causes the Loop Gain of the system to encircle the –1 point, making the system unstable.(More)
SPICE simulation is already recognized as a viable tool in Power Electronics. Simulation is particularly useful when dealing with a non-linear behavior that cannot be easily handled analytically. Such a case is the analysis of a switching power converter that includes a non-linear inductor that might affect the inrush current, magnitude of the current(More)
A discrete time-domain based system identification method for PWM DC-DC converters is presented. The proposed procedure is capable of successfully reconstructing the system's model from an arbitrary excitation at the command input. In this study, a step perturbation was applied, which is simple to apply and has an intuitive interpretation of the output(More)
This paper presents an innovative biomechanical energy harvesting system based on the regenerative braking concept applied to the human natural motion. To determine optimal braking profile previous studies used an off-line procedure based on constant external load to determine the optimal braking profile. The new concept of this study continuously optimizes(More)
The closed loop response of voltage feedback converters was reexamined theoretically and tested by simulations and experiments. It was found that the classical second order representation of the closed loop response of a PID controlled system is incomplete due to the contribution of previously neglected factors, such as a closed loop zero and low loop gain,(More)
Resonant converters and related systems, such as piezoelectric transformers, may require a high-resolution frequency drive when the quality factor of the network is high or to avoid limit cycle oscillations. This high frequency resolution requirement could be beyond the capabilities of low cost microcontrollers. To remedy this problem, a frequency(More)
This paper introduces a new envelope tracking power supply to enhance the performance and reduce the overall volume of transmitter modules. The realization is based on a gyrator resonant switched-capacitor converter (GRSCC) that acts as a controlled bi-directional current source with a virtually instantaneous response to create the desired envelope. A(More)