There is a coupling relationship between the light source stability of the LED fan light and the electromagnetic compatibility of the power unit. The integrated device encapsulates the air power module and the solid-state lighting unit in a coaxial space. The degree of interference of the rotating magnetic field on the electronic ballast determines the luminous flux fluctuation threshold. The change of the angular momentum of the fan blade driven by the variable frequency motor will cause power quality disturbance. This transient harmonic reversely modulates the pulse width frequency of the LED driver chip through the common power supply circuit.
The electromagnetic shielding structure used in the design of the LED fan light decouples the electric field distribution of the power winding and the light-emitting module in space. The insertion loss characteristics of the ferrite magnetic ring suppress the high-frequency conduction interference of the LED fan light, so that the PWM dimming signal and the motor control pulse are orthogonally isolated in the time domain. The conductive coating of the heat dissipation substrate forms a Faraday cage effect, blocking the radiation noise generated by the rotating parts.
The power supply ripple suppression ratio parameter of the drive circuit is directly related to the visibility of the light intensity fluctuation of the LED fan light, and the synchronous rectification technology reduces the periodic impact current of the switching power supply. Mechanical vibration is converted into heat energy through the energy dissipation characteristics of the shock-absorbing rubber pad, avoiding poor contact caused by resonance.
