Portable Partial Discharge Detector
Applies to line drivers for power line carriers, which internally contain 2 current feedback amplifiers.
The chip for the zero-crossing detection circuit detects the input voltage. When the input voltage is below a threshold, the open-drain output delivers current, driving the opto-coupler chip to generate a power line zero-crossing detection signal for the application control system. When the input voltage exceeds the threshold, the output presents a high-impedance state. The chip itself has extremely low power consumption, with a static operating current of less than 10uA.
The chip integrates rectifier diodes required for powering the chip and the opto-coupler, and a Zener diode at the input. Only an external capacitor is needed to power the zero-crossing detection circuit from the input, resulting in a solution that requires minimal peripheral components.
