Embedded Control of n-Level DC–DC–AC Inverter

Abstract

A generalized multilevel inverter (MLI) with front-end DC-DC conversion stage followed by a synchronized H-bridge is presented. By using this configuration along with the proposed embedded control, any desired number of levels (n) in the output voltage can be produced. The DC-DC conversion stage employs an asynchronous buck converter. The duty cycle of DC-DC converter is varied in the form of m-level piecewise constant (PWC) unidirectional sine wave to produce a similar output voltage across the DC-link capacitor. The unidirectional PWC voltage is made into n-level AC voltage, where n = (2m-1), by the synchronized H-bridge. Hence, it is named as DC-DC-AC Multilevel Inverter (DDA-MLI).An 8-bit Xilinx SPARTAN 3AN field programmable gate array (FPGA) based digital controller is utilized for the simultaneous generation of high frequency switching pulses for DC-DC converter and synchronized fundamental frequency switching pulses for H-bridge. The desired number of levels in AC output voltage and its frequency are the essential inputs to the pulse generation algorithm implemented in FPGA. The proposed MLI is simulated in MATLAB/Simulink ® environment; its functioning is verified with resistive (R) and resistive-inductive (RL) loads. The hardware prototype of MLI is built in the laboratory and its performance is validated with R, RL loads and few home appliances. 0885-8993 (c)

Buck converter-based cascaded asymmetrical multilevel inverter with reduced components

“…A, Comparison of power losses of the proposed topology with the existing buck converter (BC) based topology as reported in Reddy et al and B, comparison of an efficiency of the proposed topology with the existing BC‐based topology reported in Reddy et al…”

“…Based on the developed H‐bridge, a new topology has been implemented to reduce the number of IGBTs, DC sources, and standing voltage, but this topology uses a high number of a variety of DC voltage sources . Recently, to minimize the DC sources, a new topology of single H‐bridge with buck converter (BC) has been reported . The drawback of this topology is that the BC carried 100% power with only one H‐bridge.…”

“…20 Recently, to minimize the DC sources, a new topology of single H-bridge with buck converter (BC) has been reported. 21 The drawback of this topology is that the BC carried 100% power with only one Hbridge. Due to this, at high voltage, the rating of the semiconductor switches, the size of the components of the BC, and the power losses of the BC are increased.…”

Embedded Control of Z Source and Quasi-Z Source Based Multilevel Inverter

“…The performance of single phase Z-source inverter is analyzed by using MATLAB/simulink [4]. The switching function of proposed MLI topology is controlled by embedded controller and performance of MLI is observed [5]. The proposed MLI topology is controlled by embedded controller and its give high quality output nearer to the sinusoidal waves [6].…”

Principle and Control of Modified Cascaded NPC-GCI With Variable Topology Ability to Enhance European Efficiency

“…There are several kinds of grid-connected inverter (GCI) configurations with a wide operational range, i.e., the two- stage two-level topology [11,12], the multi-level inverter [13]- [16] and Z-source converter [17]- [20]. A DC-DC converter is contained in the two-stage two-level topology to achieve a wide generation range of the solar cells.…”