FREQUENCY MODULATION CIRCUIT, DRIVE CIRCUIT AND CONTROL METHOD THEREOF, AND LIGHTING SYSTEM

摘要

Provided are a frequency modulation circuit, a drive circuit and a control method thereof, and a lighting system. The frequency modulation circuit comprises a rectifying and filtering subcircuit, a regulator subcircuit, a control subcircuit and a switching subcircuit. The frequency modulation circuit enables an LED to emit an optical signal carrying content information, such that a user can receive the optical signal to obtain the content information.