10-11-2012, 05:20 PM
A novel DC-AC Single Phase Resonant Inverter using
soft switching boost converter
A Novel DC-AC Single Phase Resonant Inverter using soft switching boost converter.pdf (Size: 240.02 KB / Downloads: 32)
INTRODUCTION
Nowadays, the power electronics are required to develop
smaller, lighter, less expensive and reliable system. In order to
operate these systems, a switching frequency has to be increased.
But, increasing the inverter switching frequencies is dependent
on the advances in device technology and makes higher
switching losses. [1], [2]
To solve this problem, the soft switching techniques have
been adopted in the inverter circuit. By the soft-switching
techniques, the switching losses are ideally zero and the
switching frequencies can be increased to above the audible
range. In this paper, a novel DC-AC single phase resonant
inverter using soft switching boost converter is proposed. This
proposed inverter consists of soft-switching boost converter and
H-bridge inverter. The soft-switching boost converter in
proposed inverter additionally has resonant inductor Lr, resonant
capacitor Cr, bridge diode and auxiliary switch Q2. When the
resonance between resonant inductor and capacitor is generated,
the converter switches are turned on and off with soft-switching.
Also H-bridge inverter switches are turned on and off with ZVS
when the auxiliary switch is turned off. So all of the switches are
turned on and off with soft-switching. [3], [4], [5], [6]
EQUVALENT CIRCUIT ANALYSIS
Mode 1 (t0t<t1): The resonant capacitor is discharged through
resonant path Cr and Lr. The resonant inductor current begins to
increase linearly from zero. Therefore, the main switch is
turned on with ZCS influenced by resonant inductor. The
energy of the main inductor is delivered to the load through the
switches (S1, S4).
CONCLUSION
In this paper, we proposed a novel DC-AC single phase
resonant inverter using soft-switching boost converter. In this
topology, all switches perform a soft switching by resonance
between the resonant inductor and capacitor. So, the proposed
topology can reduce the switching loss and voltage stress. The
proposed inverter is analyzed through the operation mode, and
its validity is proven through simulation.