18818454. ZERO-CROSSING DETECTION CIRCUIT (ROHM CO., LTD.)
ZERO-CROSSING DETECTION CIRCUIT
Organization Name
Inventor(s)
Natsuki Yamamoto of Kyoto (JP)
ZERO-CROSSING DETECTION CIRCUIT
This abstract first appeared for US patent application 18818454 titled 'ZERO-CROSSING DETECTION CIRCUIT
Original Abstract Submitted
A semiconductor integrated circuit device includes: a zero-crossing detection unit configured to compare a first monitoring target signal and a second monitoring target signal respectively input through diodes from a first node and a second node between which an AC signal is applied, so as to generate a comparison signal; a logic unit configured to count a period of the comparison signal and estimate a zero-cross of the AC signal using the count value, so as to generate a zero-crossing detection signal; and a monitoring unit configured to adjust the first monitoring target signal and the second monitoring target signal to be suitable for input to the zero-crossing detection unit, where a first chip, in which the monitoring unit is integrated, is cut out in a rectangular shape having a substantially equal ratio between a short side and a long side in a plan view.