Random pulse width modulation of delta inverter for automotive applications

Efficient FPGA‐based real‐time implementation of an SVPWM algorithm for a delta inverter

“…This method has been widely implemented on various digital platforms with the aim to control various power conversion topologies such as multilevel inverters, matrix converters etc. However, the real-time implementation of such an advanced control algorithm on the delta inverter has been validated only once using the microcontroller 'MC68332' from 'Motorola' [8,9]. This paper proposes therefore an enhanced SVPWM algorithm for a delta inverter.…”

Randomized modulation of power converters via Markov chains

“…While a substantial part of the engineering effort was directed toward the optimization of deterministic PWM waveforms ("programmed switching"), an alternative in the form of randomized modulation for dc/ac conversion was offered in [35]. The same idea has been pursued in a dc/dc setup in [32], and in numerous references afterwards, for example, [2]- [4], [7], [8], [13], [15]- [17], [25], [27], [31], [33], and [34]. The effect of the randomization is to attenuate the discrete spectrum, and introduce a continuous spectrum.…”

Vector control of delta inverter

“…One of such strategies has already been investigated for the delta inverter, with only a modest success though [3]. The described, deterministic VPWM technique can, however, easily be modified to generate random switching patterns resulting in good quality of the inverter operation at reasonable switching frequency levels.…”

“…Specifically, at the mentioned sinusoidal modulation, the voltage conversion ratio of the delta inverter equals only 58 % of that of the bridge inverter, as the maximum available r.m.s. value of the fundamental voltage equals I@, i.e., 0.707, of Vdc [3]. For this reason, the load should be, preferably, del ta-connect ed .…”

“…2. n e triangle connecting the voltage vectors V3, Vs, and V, corresponding to the three allowed states of the inverter, represents the boundary of a control space. It means that only the voltage vectors contained within this space can be generated by means of pulse .width modulation[3]. Voltage vector diagram for the delta inverter.…”