Design and application of a novel zero-crossing detector circuit

Irmak, Erdal; Çolak, İlhami; Kaplan, Orhan; Güler, Naki

doi:10.1109/powereng.2011.6036535

Cited by 21 publications

(12 citation statements)

References 7 publications

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“…It is also possible to use an additional electric circuit that will perform the function of determining the current direction in a hardware manner. An example of such a solution based on a zero-crossing detector is shown in Figure 13 [36]. One of the more precise issues related to the measurement of currents in AC/AC converters is the detection of its direction needed to ensure correct commutation of the tan resistors [21].…”

Section: Measurement Of Voltages and Currentsmentioning

confidence: 99%

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Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Szcześniak

2019

Energies

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AC/AC converters that do not have a DC energy storage element, such as a matrix chopper and a matrix converter, are increasingly becoming alternatives to conventional two-stage AC/DC/AC converters and thyristor choppers. In such systems, the main DC-link capacitor does not exist, so the system provides more reliable operation and makes it possible to reduce the financial costs of its construction. It should be noted that AC/AC converters without an energy storage element in a form of DC-link capacitors have not been implemented on an industrial scale. The reasons involve technical aspects and cost components. The main aim of this paper is to present some of the challenges and selected design requirements for industrial applications of AC/AC high reliability power converters.

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Section: Measurement Of Voltages and Currentsmentioning

confidence: 99%

Section: Measurement Of Voltages and Currentsmentioning

confidence: 99%

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Szcześniak

2019

Energies

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“…The characteristics of the current probe used for data acquisition are given in Appendix B. The circuit used for the detection of the zero crossings of the current (represented as the zero-crossing box in Figure 2) is the circuit presented in [42].…”

Section: Experimental Validationmentioning

confidence: 99%

Cost-Effective Reduced Envelope of the Stator Current via Synchronous Sampling for the Diagnosis of Rotor Asymmetries in Induction Machines Working at Very Low Slip

Burriel-Valencia

Puche-Panadero

Martínez-Román

et al. 2019

Sensors

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Fault diagnosis of rotor asymmetries of IM using the stator current relies on the detection of the characteristic signatures of the fault harmonics in the current spectrum. In some scenarios, such as large induction machines running at a very low slip, or unloaded machines tested offline, this technique may fail. In these scenarios, the fault harmonics are very close to the frequency of the fundamental component, and have a low amplitude, so that they may remain undetected, buried under the fundamental’s leakage, until the damage is severe. To avoid false positives, a proven approach is to search for the fault harmonics in the current envelope, instead of the current itself, because in this case the spectrum is free from the leakage of the fundamental. Besides, the fault harmonics appear at a very low frequency. Nevertheless, building the current spectrum is costly in terms of computing complexity, as in the case of the Hilbert transform, or hardware resources, as in the need for simultaneously sampling three stator currents in the case of the EPVA. In this work, a novel method is proposed to avoid this problem. It is based on sampling a phase current just twice per current cycle, with a fixed delay with respect to its zero crossings. It is shown that the spectrum of this reduced set of current samples contains the same fault harmonics as the spectrum of the full-length current envelope, despite using a minimal amount of computing resources. The proposed approach is cost-effective, because the computational requirements for building the current envelope are reduced to less than 1 % of those required by other conventional methods, in terms of storage and computing time. In this way, it can be implemented with low-cost embedded devices for on-line fault diagnosis. The proposed approach is introduced theoretically and validated experimentally, using a commercial induction motor with a broken bar under different load and supply conditions. Besides, the proposed approach has been implemented on a low-cost embedded device, which can be accessed on-line for remote fault diagnosis.

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“…The authors of [20] propose a circuit (Fig. 5.) that uses an operational amplifier as the main voltage polarity detector.…”

Section: A Hardware Solutionsmentioning

confidence: 99%

Low-Cost Voltage Zero-Crossing Detector for AC-Grid Applications

Vorobyov

Vitols

2014

Electrical, Control and Communication Engineering

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-Renewable energy sources and energy storage devices are becoming more popular. Some of them like small hydropower turbines, wind turbines and diesel generators produce AC voltage with different frequency and voltage than the main grid. For them power electronics converters are necessary. Power electronics converters presented in industry use two or three level energy conversion, although direct AC to AC converters exist, but one of the main problems is the switch commutation when current or voltage is crossing the zero point. Zero crossing sensors are used to solve this problem. They consist of current or voltage measurement unit and zero crossing detector. Different approaches are used for zero crossing: hardware or software. Hardware approach is simple but it has low precision. Software approach has high precision but it is complicated and expensive. In this paper a simple low cost high precision approach is presented. It takes all advantages from both approaches. While tested with two types of microcontrollers the precision of experimental measurement is 25 µs -40 µs.

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Design and application of a novel zero-crossing detector circuit

Cited by 21 publications

References 7 publications

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Challenges and Design Requirements for Industrial Applications of AC/AC Power Converters without DC-Link

Cost-Effective Reduced Envelope of the Stator Current via Synchronous Sampling for the Diagnosis of Rotor Asymmetries in Induction Machines Working at Very Low Slip

Low-Cost Voltage Zero-Crossing Detector for AC-Grid Applications

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