Patent ID: 9130475
Filing Date: 2015-09-08
Classification: G09G,H02M

Abstract:
1. A switched-mode power supply (SMPS) catching radiated electromagnetic interference (EMI) and using its energy, comprising: a specific component which generates radiated EMI; an antenna disposed on or embedded in the specific component, wherein the frequency range of the antenna corresponds to a frequency band of the radiated EMI generated by the specific component; a rectifier electrically connected with a terminal of the antenna; an energy storage capacitor electrically connected with the rectifier; a power converter; and a control chip for the power converter, with a power supply terminal of the control chip electrically connected with a first terminal of the energy storage capacitor, with a second terminal of the energy storage capacitor electrically connected to ground, with the first terminal and the second terminal of the energy storage capacitor electrically connected with an auxiliary power supply circuit, with the rectifier electrically connected with an anode terminal of a first diode, with a cathode terminal of the first diode electrically connected with the first terminal of the energy storage capacitor, wherein the auxiliary power supply circuit comprises an auxiliary winding and a second diode, with the auxiliary winding disposed on a primary side of a transformer, with a first terminal of the auxiliary winding electrically connected with an anode of the second diode, with a cathode terminal of the second diode electrically connected with the first terminal of the energy storage capacitor, and with a second terminal of the auxiliary winding electrically connected to the ground.