Abstract
Recently, the high-performance converter with wide range and high gain has been widely used in these cases such as PV power generation. On the other hand, there are more highly variable stresses on switch and diode in high-performance converter than the traditional DC-DC converters due to the wide range and high gain. Therefore, it is necessary to diagnose switch and diode faults in high-performance converter. In this paper, the switch and diode fault are analyzed and compared with traditional DC-DC converters. Then, an online diagnosis technique based on the inductor voltage polarity of the DC-DC converter is proposed. This technique only uses the inductor voltage polarity and the switch gate drive signal as signatures to diagnose short-circuit or open-circuit fault of the switch and diode. The technique is cost-effective and simple because it uses simple auxiliary windings to sense the inductor voltage polar and uses some logic circuit to generate indicators. The details of the technique are discussed through an example of the quadratic Boost converter. Experiments illustrate the correctness of the proposed technique and show its capability for switch and diode fault diagnosis.
Highlights
In recent years, new energy resources such as photovoltaic (PV) cells, wind power, and fuel cell, have been widely used to reduce air pollution from oil resources and others
Faults occur in the DC-DC converter, which will cause the power generation system malfunction or reduce the efficiency, and in some cases will cause the second faults
Aim to the fault diagnosis of the switch and diode in high performance converters, such as quadratic converters, this paper proposes a new diagnosis method, in which the voltage of the magnetic component that is easier to extract and the switch gate drive signal are selected as the fault detection signals
Summary
New energy resources such as photovoltaic (PV) cells, wind power, and fuel cell, have been widely used to reduce air pollution from oil resources and others. The inductor voltages captured by an auxiliary winding combined with logic circuits have been utilized to detect switch faults in traditional non-isolated dc–dc converters [18], [21] Aim to the fault diagnosis of the switch and diode in high performance converters, such as quadratic converters, this paper proposes a new diagnosis method, in which the voltage of the magnetic component that is easier to extract and the switch gate drive signal are selected as the fault detection signals. According to the voltage of the magnetic component before and after the failure of the switch tube and diode, fault diagnosis circuit is designed based on the characteristics of the change This technology has the advantages of low cost, easy operation, wide fault coverage, good online performance, and fast speed.
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