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For switching DC-DC converters, a large and rapid load-current transient ΔIload causes a large output voltage undershoot ΔVUS and long settling time ts if the transient responses are slow [1]. Since the output capacitor current ICo instantly reflects ΔIload, transient response optimization for minimizing ΔVUS and ts with given charging and discharging slopes of inductor current ILo can be achieved...
A fuzzy control strategy is presented to implement the neutral-point (NP) potential balance based on the power stage of three-level Boost dc-dc converter in this paper. The presented fuzzy controller can solve the imbalance problem of NP potential in the process of starting up and can suppress the influence of inverter circuit modulation strategy on NP potential. It is the fuzzy controller that can...
Recent studies have shown that intermediate frequency alternating electric fields stimulation is a promising alternative treating strategy for proliferative diseases including tumors. This article presents a safe electronic device which is capable of generating low intensity electric fields of sine, square, triangle wave from 100 kHz to 1MHz. The electric fields are generated by a waveform generator,...
The reason why the neutral point (NP) voltage unbalance is analyzed in detail and a Fuzzy Controller based on control index proposed. This way to balance the NP voltage is simple and need not extra hardware cost. Fuzzy controller can automatically and intelligently adapt the value of the control index and change the operation time duration of the small vectors. The Fuzzy controller design has been...
This paper summarized the basic principle of magnetic stimulation, and established the connection between action potential of neural cell and electrical parameters by simulating the neural model. The simulation of coil electromagnetic field and calculation of circuit mathematical model were also combined to derive out the electrical parameters. They are charging voltage, discharging current, stimulating...
The reason why the neutral point voltage fluctuates is analyzed in detail and a current-sensorless hysteresis control strategy proposed. This way to balance the neutral-point voltage is simple and not need of current sensor. Based on small signal control model and neutral-point voltage balanced technique the experimental prototype are given and the experimental results verify that the proposed mathematic...
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