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Induction heating is a powerful technique for providing high temperature to several applications such as steel melting, brazing and surface hardening. This paper proposes full bridge resonant inverter for nonmetal induction heating application containing six components: transformer, full bridge rectifier, full bridge inverter, resonant tank, high frequency transformer and non-ferrous metal smelting...
Induction heating is a popular and powerful technique to provide very high temperature for applications such as steel melting, brazing, and surface hardening. This paper presents full bridge resonant inverter for nonmetal induction heating application including six components: transformer, full bridge rectifier, full bridge inverter, resonant tank, high frequency transformer, and non-ferrous metal...
This paper presented a high frequency isolated asymmetrical Class-D resonant inverter for induction heating saw blades application. The main power circuit are operated under the zero-voltage switching (ZVS) condition and matching impedance used leakage inductance and magnetite inductance at the primary side of high frequency transformer apply to matching impedance tank. A main power circuit employed...
This paper presented a nearly unity power factor isolated Class-D resonant inverter for series multi-coil induction hardening. The main switch are operated under the zero voltage switching condition and used leakage inductance and magnetite inductance of high frequency transformer apply to LLC resonant tank. A prototype was Class-D resonant operating 102–110 kHz variable frequency, when as heat up...
This dissolved gas analysis is the most important tool for determining the condition of power transformer. It is the first indicator of a problem and can identify deterioration of the insulating such as overheating, hot spot, partial discharge and arcing. Therefore, this paper presents a prediction technique of power transformer condition assessment, by using DGA parameters in the analysis. The key...
This paper present the study an improved maximum power point (MPP) of photovoltaic cells (PV Cells) with buck converter by using passive inductor and capacitor for comparative continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In the study improved maximum power point addition using inductor or capacitor output of PV Cells connected buck converter in both modes, a buck converter...
The development of condition evaluation for power transformer maintenance are presented in this paper. The techniques consist of three types: electrical test, insulating oil test and visual inspection, which is considered by 21 test methods: Dissolved Gas Analysis, Load History, Power Factor, Thermo Scan, Oil Quality, Furan, General Condition, Bushing, Surge Arrester, Conservator Tank, Main Tank,...
This paper presented a high power factor Class-D LLC resonant inverter for multi-coils induction hardening application. The main function of the Class-D resonant inverter is to provide high frequency AC from bridge rectifier and LC filter input voltage. The advantages of this technique, the power switched are operated under the zero voltage switching condition and the transformer leakage inductance...
This paper presented a high efficiency Class-D resonant inverter high power factor for induction heating multi-coils hardening application. The main function of the Class-D resonant inverter is to provide high frequency AC from bridge rectifier and LC filter input voltage. The advantages of this technique, the power switched are operated under the zero voltage switching condition and the leakage inductance...
This paper present the study effect and improved Maximum Power Point (MPP) of Photovoltaic Cells (PV Cells) with DC-DC Converter. In the study addition with capacitor output of PV Cells and implementation compared with maximum power point of DC-DC Converter operation Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). Experimental result show that the maximum power point is increase...
This paper present the study of photovoltaic cell (PV Cells) output power characteristics by experimenting with the simulation of equivalent circuit and of output behavior of photovoltaic while connected to the buck converter, with adjustment of its duty ratio (D). Experimental result show that the maximum power point (MPP) is reduced 24 %, while connected to the buck converter load compared with...
The diagnostic techniques to evaluate the internal condition of power transformer are presented in this paper. The techniques consist of electrical testing and insulating oil testing with their associated limitation to classify normal and abnormal conditions. The electrical diagnostics include exciting current, leakage impedance, ratio, DC resistance as well as core and winding insulation measurements...
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