US 12,461,406 B2
Dimming device and dimming method
Yusuke Shiratori, Kariya (JP)
Assigned to AISIN CORPORATION, Kariya (JP)
Filed by AISIN CORPORATION, Kariya (JP)
Filed on Feb. 14, 2024, as Appl. No. 18/441,024.
Claims priority of application No. 2023-041832 (JP), filed on Mar. 16, 2023.
Prior Publication US 2024/0310665 A1, Sep. 19, 2024
Int. Cl. G02F 1/133 (2006.01); G02F 1/1334 (2006.01)
CPC G02F 1/13306 (2013.01) [G02F 1/1334 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A dimming device for controlling a dimming rate of a dimming member, the dimming device comprising:
a DC/AC inverter configured to convert a direct-current voltage into an alternating-current voltage requiring a predetermined period and amplitude; and
an inverter drive unit configured to drive the DC/AC inverter based on an opening and closing control signal, wherein
the inverter drive unit includes a command value generation unit configured to generate an opening and closing command value for controlling an opening and closing state of a switching element provided in the DC/AC inverter, and
the command value generation unit generates, by overlapping a plurality of harmonic components of a fundamental wave formed of a sine wave on the fundamental wave, the opening and closing command value such that each of a peak region including a peak value and a bottom region including a bottom value of the opening and closing control signal includes a low-curvature arc-shaped portion and a large-curvature arc-shaped portion in which both ends of the low-curvature arc-shaped portion have a large-curvature arc shape having a curvature radius smaller than a curvature radius of the low-curvature arc-shaped portion.