Power line carrier communication is a unique and basic communication mode of the power system, which uses the existing power line to transmit analog or digital signals at high speed through the carrier mode. The power line is used as a network access scheme, the existing power distribution network can be used for communication, and there is no need to re-wire, and the power line network is widely distributed, the access is convenient, and multiple users can share broadband.
Power line zero-crossing detection circuits are widely used in power carrier communications, power equipment and home appliance access switching. Guoxin Sichen CN71102 is a chip dedicated to zero-crossing detection circuit by detecting the input voltage, when the input voltage is less than the Min value, drive the optocoupler chip, get the power line zero crossing detection signal, and provide it to the application control system, when the input voltage is greater than the Min value, the output terminal presents a high-impedance state.
CN71102 zero-crossing detection application.
The CN71102 itself has extremely low power consumption, and the quiescent operating current is less than 10UA, so that most of the electrical energy can be used to drive the optocoupler, and a wide zero-crossing detection pulse is obtained, making the system easier to detect. The input of the CN71102 adopts a Schmitt trigger, and the input low voltage VIL is as low as 06V, input high voltage VIH up to 25V, with high detection accuracy, and the internal hysteresis processing also makes it easier for the chip to filter out the glitches on the power line, effectively preventing false zero-crossing detection signals caused by noise on the power line. Guoxin Sichen can provide full technical support and advantages.
CN71102 pin.
The rectifier diode of the power supply required for the power supply of the chip and the optocoupler is integrated into the chip, and the voltage regulator diode is integrated at the input. Only an external capacitor is required to power the zero-crossing detection circuit from the input terminal, and the overall solution requires fewer peripheral components and the PCB board is easy to layout. The characteristic parameters of CN71102 are as follows:
Low power consumption, operating current < 10ua
High detection accuracy.
Effectively filter out power line noise.
Integrated rectifier diode.
Integrated regulator diode.
Few peripheral components.
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