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This paper explore the odevity coordinate to conduct virtual space vector modulation for the neutral point clamped inverter. It deduced the mathematical expressions of the duty ratio of six sectors and presented a unified space vector sequence. This modulation simplifies the calculation and eliminates the difference between sectors of virtual space vector algorithm as well as removes the low frequency...
A Carrier Based Double Signal PWM (CB-DSPWM) scheme in conjunction with a zero sequence signal to mitigate voltage unbalances at neutral point (NP) for three-level NPC converters is proposed. The scheme compensates the dc link capacitor voltage unbalances and eliminates the low frequency voltage oscillations at NP that appear under certain operating conditions of the converter. The voltage balancing...
A triangular modulation profile using switched-capacitor scheme for spread spectrum clock generator (SSCG) is presented in this paper. The working principle consists of modulating the oscillator's constant clock frequency with a triangular signal. This will spread the energy of each harmonics into a certain frequency band, thus reducing the peak amplitude of electromagnetic interference (EMI) at harmonic...
Concerning switching-mode power supply, voltage or current transformation for power conversion is conducted by high speed semiconductor device, while high voltage or current spike produced in the process of switching causes serious electromagnetic interference noises. Ordinary DC/DC converters work under fixed switching frequency mode, so the spectrum is discrete and the energy concentrate at the...
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