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

Abstract

-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.

Proteus ISIS simulation for power factor calculation using zero crossing detector

“…A zero-crossing detector can have two types of output signals. The zero-crossing should be during the transition between positive and negative input signals [7]. Zero-crossing is the point of choice for measuring phase and frequency.…”

“…The hardware approach is simple, but it has low precision. On the other hand, the software approach has high precision, but it is complicated and expensive [7]. Zero-voltage cross detection is commonly used as an accurate method of detecting AC characteristics, such as frequency and phase.…”

Zero Crossing Detector and Timer Based Supply Voltage at Peak Breaker

“…If the voltage reachs 0 volts is detected, a delay equal to a quarter period of the power line will be added before do the termination. To detect a 0 voltage can be done using Analog to Digital convert er sensing or by using a zero crossing detector sensing (ZCD) (Wall, 2003) (Gupta, Thakur, & Murarka, 2013) (Vorobyov & Vitols, 2014). Zero crossing detector is used because its less expensive than using ADC.…”

Elektronik Şalter ve Kaçak Akım Röleli Hibrit Bir Sistemin Geliştirilmesi

“…Günümüzde; distorsiyonun, gecikmenin ve maliyetin en düşük olduğu sıfır geçiş tabanlı elektronik şalter çalışmaları bulunmaktadır. Vorobyov ve Vitols; optik yalıtıcı devreler [11], karşılaştırıcı devreler [12][13], işlemsel yükselteçler [14], adaptif filtre yöntemleri [15][16], yapay sinir ağları [17] sıfır geçişli detektör tiplerini distorsiyon seviyesi, gecikme ve fiyat olarak karşılaştırmıştır [18].…”