International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
A Single Inductor Dual Buck Inverter Alaka K1, Jeena Joy2, Reenu George3 1PG
Student[PE], Dept. of Electrical and Electronics Engineering, Mar Athanasius College of Engineering Kothamangalam, Kerala, India 2Assistant Professor, Dept. of Electrical and Electronics Engineering, Mar Athanasius College of Engineering Kothamangalam, Kerala, India 2Assistant Professor, Dept. of Electrical and Electronics Engineering, Mar Athanasius College of Engineering Kothamangalam, Kerala, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In an inversion system, high reliability is one of
the main targets pursuing. Some problems will threaten the reliability of the system, such as the shoot through issue and the failure of reverse recovery. The dual buck inverters can solve the above problems without adding dead time. A new topology of dual buck inverter with series connected diodes and a single inductor is presented here. The system retains the advantage of no reverse recovery of body diode. The inverter has just one filter inductor, which can make the volume and weight of the system decreased observably and improve the integration. The whole system is simulated in PSIM environment Key Words: Body diode, MOSFET, PSIM, Reverse recovery, SPWM.
1. INTRODUCTION
bridge inverter, two extra switches are applied in the proposed topology. The single inductor topology can make full use of the inductance, but the conducting loss is largely increased because four switches are flown through during the power delivering modes. This paper presents a kind of novel phase leg topology with series connected diodes and single inductor, to improve the reliability of the inverter, especially for the MOSFET inverter [6]. Applying the phase leg to the single phase inverter, an improved single inductor dual buck inverters are proposed in this paper. The novel topology has the following advantages. Firstly, retains the advantages of the traditional dual buck inverters, secondly, makes full use of the inductance, thirdly, the proposed inverter saves two switches compared to the traditional single inductor topology, which makes a lower conducting loss and a simpler controlling strategy. The simulation and experimental results have verified using PSIM.
The fast development of the clean energy power generation requires the inversion system, especially the inverters, to be more reliable. Yet shoot through problem of the power devices is a major threaten to the reliability. A traditional method to solve the shoot through issue is by setting dead time. However, the dead time will cause a distortion of the output current. Also, during the dead time, the current may flow through the body diode of the switch which can cause the failure of the reverse recovery [1]. For the purpose of solving the above problems, the dual buck topologies are proposed in a lot of research. By combining two unidirectional buck circuits, the dual buck inverters will not suffer threaten of shoot through problem and the freewheeling current will flow through the independent diodes which can solve the reverse recovery problem of the MOSFET’s body diodes. However, the major drawback of the dual buck topologies is the magnetic utilization. Only half of the inductance is used in every working mode. And it will obviously increase the weight and volume of the system [2][4].
2. CONFIGURATION OF OF DUAL BUCK INVERTER
In order to improve the magnetic utilization of the dual buck inverter, a kind of single inductor dual buck topology was proposed in [5]. Compared with the traditional full
Comparing to the traditional dual buck full bridge inverter, the single inductor topology can save half of the inductance. And the novel topology retains the original advantages of
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The most attractive advantage of the dual buck topologies is the high reliability. Firstly, without adding the extra dead time, the dual buck topologies can solve the shoot through problem. Secondly, compared to the traditional H-bridge inverter, the current will not flow through the body diodes of the switches in the dual buck topologies which mean no reverse recovery problem exists in the MOSFET phase legs. Considering the above two aspects, the dual buck topologies can achieve high reliability without the shoot through and reverse recovery issues. However, the main drawback of the dual buck topologies is the low magnetic utilization. In each power delivering and freewheeling modes, the current only flow through half of the inductance, which means the other half of the inductance, is wasted in each working condition. The low utilization of the inductance makes the increasing of the weight and volume for the whole system. To solve this problem, a concept of single inductor dual buck full bridge inverter [7] is proposed. The circuit diagram of the inverter is shown in fig.1.
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