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This paper presents a new intelligent power module (IPM) family dedicated for low power industrial inverter drive applications, especially for low cost and compact size requirements. The new IPM family integrates converter, inverter, brake and driver circuits into a compact, high reliable transfer-molded package with fine cell pitch Carrier Stored Trench-gate Bipolar Transistor (CSTBTTM) power chips,...
Microinverters are module-level power electronic (MLPE) systems that are expected to have a service life more than 25 years. The general practice for providing assurance in long-term reliability under humid climatic conditions is to subject the microinverters to ‘damp heat test’ at 85°C/85%RH for 1000hrs as recommended in lEC 61215 standard. However, there is limited understanding on the correlation...
Inverter is a definitive solution toward ac voltage regulation in a system having input dc voltage variation. This paper proposes, a novel single-stage single-phase buck-boost inverter called dual buck-boost inverter. It has the buck-boost function and requires only four active switches. It has no shoot-through worries and has improved reliability. In the proposed inverter, the body diodes of switches...
Resonant frequency of an LCL filter in grid-connected inverters decreases with increase in inductive grid impedance. It is also affected by drop in magnetic permeability of filter inductor with increase in current. This resonant frequency variation affects grid-voltage harmonic rejection and compromises stability. Hence, an improved resonant frequency based LCL filter design method is presented in...
Concurrent dual-frequency ac outputs from a single-inverter configuration potentially benefit many industrial applications, such as induction heating and wireless power transfer. In this paper, a phase-shift dual-frequency selective harmonic elimination (DFSHE) method is proposed to simultaneously generate and regulate two ac outputs at different frequencies from a single full-bridge inverter, which...
This paper proposes a new topology named a modified switched-capacitor Z-source inverter (MSC-ZSI) based on the classical ZSI, in which an impedance network consists of symmetric two cells and each cell has two inductors and two capacitors, and one diode. In comparison to the other topologies based on switched ZSI, the proposed topology provides higher boost capability and lower voltage stress across...
The natural swinging filter inductance due to core's magnetic permeability can affect control stability. Conventional control methods generally adopt larger cores to avoid this issue. Division-Summation (D-Σ) digital control, on the other hand deals with the problem by including this filter inductance variation in the control law. It allows the use of much smaller core than conventional control methods...
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