Toward an optimal Heisenberg's closed-loop gate drive for Power MOSFETs

Abstract

Ahstract-This paper deals with spectrum analysis of a PWM signal on the basis of the study of idealized zero (instantaneous switching) and one (non-instantaneous linear switching edges) order models. In the literature, it is shown that high frequency content of a PWM signal is all the more reduced as it is differentiable a large number of times [2]. It is shown in this paper that minimal bound of high frequency spectrum is reached when a gaussian switching pattern is used. This result is proved by using the Heisenberg-Gabor uncertainty principle (widely known by physicists in quantum mechanics).

Shaping pulse transitions by active voltage control for reduced EMI generation

“…In this simulation, the load is simplified as a 10 mL inductor, the dc link voltage is 800 V and the IGBT is 1700V/400A CM400HA-34H Pspice Model. The Gaussian part of the reference signal is obtained from Matlab by using a Gaussian filter [15], and imported into Pspice with a text table. In the simulation, the Gaussian signal is added to the operational PWM noting that the AVC input is a scaled version of the Fig.…”

“…A "S-shaped" transient with a higher order of derivation (for a low discontinuity content) has been proven to be better than the "Sine-shaped" transient [4]. Recently, a Gaussian switching pattern was mathematically shown to be promising [15], but without giving a practical controller and it does not take account the diode recovery.…”

Identification of the temporal source of frequency domain characteristics of SiC MOSFET based power converter waveforms

“…It is shown through analysis and simulation that the practical realization of smoothed waveforms of this type could not only lead to improvements in the EMI performance of the system, but also improve the temporal performance under the influence of parasitic elements. Given an understanding of how the smoothness of a waveform can reduce the high frequency spectral components, adequate control could lead to improved converter performance as demonstrated in [4], [5], [12]- [14].…”

“…Works such as [2] have investigated smoother waveforms than the basic case and works such as [4], [5] have extended the idea to look at Gaussian waveforms which are an example of a completely smooth waveform. These works show clearly that waveforms exhibiting these characteristics are able to achieve an extremely high roll off.…”

Digital Active Gate Drives using sequential optimization

“…a constraint could be created to limit the rate of change of collector-emitter voltage and/or collector current as way to reduce EMI emissions above a certain frequency. One intriguing possibility is to attempt to synthesize optimal gate drive waveforms in order to obtain Gaussian shape switching edges resulting in minimum EMI emission [11].…”