Title:
ZERO-CROSS DETECTION DEVICE AND LOAD DRIVE SYSTEM
Document Type and Number:
Japanese Patent JP2023170383
Kind Code:
A
Abstract:
To provide a zero-cross detection device capable of dealing with half-wave rectification.SOLUTION: A zero-cross detection device (10) includes an input terminal (IN) configured to receive an input voltage (V1) via a diode (D2) from an application end (TM2) of an AC voltage (VAC) when viewed from reference potential, an input circuit (11) including a resistor provided between the input terminal and the reference potential, cycle detection circuits (13, 14) configured to detect a length of a cycle of the AC voltage on the basis of an interval of timing when the input voltage exceeds a threshold voltage, a peak detection circuit (15) configured to detect peak timing when the input voltage reaches a peak in each cycle of the AC voltage, and a zero-cross timing detection circuit (16) configured to detect zero-cross timing of the AC voltage on the basis of a detection result of the cycle detection circuit and a detection result of the peak detection circuit.SELECTED DRAWING: Figure 3
Inventors:
YAMAMOTO NATSUKI
NATE SATOSHI
NATE SATOSHI
Application Number:
JP2022082098A
Publication Date:
December 01, 2023
Filing Date:
May 19, 2022
Export Citation:
Assignee:
ROHM CO LTD
International Classes:
G01R19/175
Attorney, Agent or Firm:
Patent Attorney Corporation Sano Patent Office
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