Abstract
Improvement in the efficiency and cost in the high frequency inverter will play a major role in its applications like electrical vehicles (EV). A high voltage IGBTs are used in inverters to bear the voltage peaks across the IGBT switch at the turning off period of switch. By decreasing the value of voltage peak, can reduce the voltage rating of IGBT switch, by which the system cost will decrease. Decreasing the value of voltage peak can be achieved by decreasing the inductance of the inverter circuit which includes turned on switch inductance, DC link capacitors inductance and connecting wires inductance. By replacing the connecting wires with a laminated busbar in an inverter, the inductance value of a connecting wires can be reduced. Laminated bus bar is a parallel conductor plates separated by a dielectric medium. Upper plate is considered as positive plate and lower plate is a negative plate. In this paper it gives a detailed information about laminated busbar with different designs, using different conductive materials, their calculated inductance in ANSYS 3D FEM software and concluding with suitable laminated busbar for high frequency inverter.
Highlights
Laminated busbar is a device used to reduce or include the inductance in the power electronic circuits
There will be an improvement in the losses of power electronic circuits
Side view of three layer laminated busbar from layer'C', paths current path 1 (CP1) and current path2 (CP2) is shown in figure6(a) as path P1 and P2
Summary
Laminated busbar is a device used to reduce or include the inductance in the power electronic circuits. Laminated busbar is used to avoid the circulating currents in parallel connected switching devices in power electronic circuits. It has wide applications in solar energy and wind energy collection and distribution, because of its low inductance characteristics. When the switches Q1 and Q4 of the H-bridge inverter receives triggering pulses, they start conducting and a positive voltage appear across the load. From the equations 1,2,3 and 4, we can conclude that the peak voltage occurring across the switch depends on the inductance value of connecting wires and inductance of the IGBT switches. Replacing the connecting wires with laminated busbar can reduce the inductance in the inverter circuit by which, there will be a decrement in its losses. Input DC power should connected to the DC terminals provided at the right side of the busbar and load is connected at the left side AC power collector terminals provided in the busbar
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