公开(公告)号：US20140268900A1

公开(公告)日：2014-09-18

申请号：US13854805

申请日：2013-04-01

Applicant: APPLE INC.

Inventor： Yongxuan Hu ,  Keong W. Kam ,  Shimon Elkayam ,  Susan R. Schen

IPC: H02M1/44

CPC classification number: H02M1/44 ,  H02M3/158 ,  H02M3/33507

Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.

Abstract translation: 描述了具有降低的电磁干扰（EMI）的开关式电源。 该开关式电源包括在与扩频调制信号相关的带宽上连续地对控制信号进行频率调制的调制电路。 通过对开关电源中的控制信号进行频率调制，与调制的开关信号相关联的频谱内容在带宽上均匀分布，从而降低EMI。

公开(公告)号：US09350232B2

公开(公告)日：2016-05-24

申请号：US13854805

申请日：2013-04-01

Applicant: Apple Inc.

Inventor： Yongxuan Hu ,  Keong W. Kam ,  Shimon Elkayam ,  Susan R. Schen

IPC: H02M3/338 ,  H02M1/44 ,  H02M3/158 ,  H02M3/335

CPC classification number: H02M1/44 ,  H02M3/158 ,  H02M3/33507

Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.

Abstract translation: 描述了具有降低的电磁干扰（EMI）的开关式电源。 该开关式电源包括在与扩频调制信号相关的带宽上连续地对控制信号进行频率调制的调制电路。 通过对开关电源中的控制信号进行频率调制，与调制的开关信号相关联的频谱内容在带宽上均匀分布，从而降低EMI。