Online Fault Diagnosis Method for High-Performance Converters Using Inductor Voltage Polar Signatures

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.

Fault detection and isolation in system of multiple sources of energy using hierarchical Bayesian belief networks

“…Numerous research endeavors have been dedicated to identifying and isolating faults within power converters. In [4], an innovative Fault Detection and Isolation (FDI) scheme was introduced for a quadratic boost converter. This approach enables the diagnosis of Open-Circuit Faults (OCF) and Short-Circuit Faults (SCF) affecting switches and diodes.…”

A Comprehensive Review of Fault Diagnosis and Tolerant Control in DC-DC Converters for DC Microgrids

“…Applicable for multiple types of converters and with fast detection response, the major drawback of this approach is the use of additional sensor to measure inductor voltage. The effectiveness of hardware based FD technique for more complicated and high performance converters has been demonstrated in [14]. Quadratic Boost Converters (QBC) illustrated in Figure 7 are one of these high performance converters which have the advantages of wide input output range, high gain and low cost.…”

“…However, no information about its effectiveness in DCM has been shared. Figure 8 gives the complete flow chart for the fault detection and identification in [14] for the quadratic boost converter. Diode voltage V D holds important information regarding the switch/diode OCF and SCF faults in Buck, Boost and Buck-Boost converter.…”

An Open-Circuit Fault Diagnosis Method for LLC Converters

“…Signal-based fault diagnosis methods measure specific signals containing fault information and extract features for diagnosis. Typical signals include inductor currents [14], inductor voltages [15], and DC bus currents [16]. In [14], faulty switches were localized within 0.4 ms by monitoring the PWM pulses' rising and falling edges for each phase inductor current.…”