Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
October 24, 2017
Patent Application Number
15300089
Date Filed
March 26, 2015
Patent Citations Received
Patent Primary Examiner
Patent abstract
A light-dimming device includes a switch including a switching device, a controller, and a power supply module. The power supply module includes a capacitor to be charged by a constant voltage circuit. The controller includes a driver circuit, a zero-cross detection circuit, a detecting circuit, and a control circuit, and receive electric power from the capacitor. The driver circuit drives the switching device in accordance with a PWM signal. The control circuit starts generation of a pulse, to be contained in the PWM signal, for turning on the switching device after the zero-cross detection circuit detects zero-cross and also a voltage across the capacitor is threshold or more.
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