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This paper proposes an interesting control technique which cancels the transfer function of the converter by using pole-zero-cancellation method. The system stabilization design is easy to be realized by applying this technique. The impaired system stability caused by parameter variation is investigated, especially the influence of the output capacitance variation. Moreover, a parameter tracking method...
This paper investigates several factors affecting EMI-performance of digital controllers targeted at conducted-noise reduction in dc-dc converters. Four factors have been studied: frequency modulation profile, randomization ratio percentage, clock frequency, and spread-spectrum scheme. The field-programmable gate arrays (FPGAs) have made substantial improvements in price and performance throughout...
Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control, predictive control, and so on. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation...
Many switching converters use soft-switching techniques with an active-clamp snubber so as to reduce switching surge and common-mode noise. In particular, the common-source type active-clamped forward converter is known as an effective circuit topology for common-mode noise reduction. On the other hand, replacing the output rectifying diodes with synchronous rectifier circuits, the power efficiency...
Many DC-DC converters use soft-switching techniques with active-clamp snubber in order to reduce switching surge and common-mode noise. In particular, common-source type active-clamped DC-DC converter is one of the most useful circuit topology for reduction of common-mode noise. Furthermore, in low-voltage and large-current DC-DC converters, synchronous rectifier circuits are used to improve the power...
Based on the conventional forward converter, the transformer's magnetizing inductance is made small, and a reset winding of the transformer is moved to the secondary side, and furthermore, the anode terminal of the freewheeling diode is connected at a different point. Then a novel topology of DC-DC converter is proposed, and its power efficiency is predicted to be improved. This converter has both...
Abnormal phenomenon of output voltage is observed in a paralleled N+1 redundant DC-DC converter (DDC) system. The phenomenon is caused by a current sharing control under the condition of periodic load change, resulting in output-voltage increase. The mechanism of the phenomenon is analyzed with a circuit simulator and confirmed by experiment. A new type of current sharing circuit is proposed to solve...
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