公开(公告)号：US11564330B2

公开(公告)日：2023-01-24

申请号：US15930812

申请日：2020-05-13

Applicant: SEA SONIC ELECTRONICS CO., LTD.

Inventor： Wei-Chen Wu

IPC: H05K7/20 ,  G05B13/02

Abstract: A fan control circuit for controlling at least one fan of a power supply device includes a load sensing unit, a temperature sensing unit, a control unit connected to the load sensing unit, the temperature sensing unit and the fan, and a mode switching unit. The load sensing unit generates a load signal according to an output condition of the power supply device. The temperature sensing unit senses the temperature in the power supply device and generates a temperature signal. The control unit comprises a low-speed operating mode for controlling the fan according to the load signal, a mute mode for controlling the fan according to the temperature signal, and a full-speed operating mode for controlling the fan to run in a rated rotational speed. The mode switching unit controls the control unit to adjust the rotational speed of the fan by one of the three modes.

公开(公告)号：US11374529B2

公开(公告)日：2022-06-28

申请号：US17077825

申请日：2020-10-22

Applicant: SEA SONIC ELECTRONICS CO., LTD.

Inventor： Sheng-Chien Chou ,  Hsiu-Cheng Chang ,  Wei-Chen Wu

IPC: H02K7/14 ,  H02P29/40 ,  F04D27/00 ,  H02P29/68

Abstract: The present invention provides a fan speed control method for avoiding inaccurate control caused by sudden changes in a power supply output state, including the steps of: acquiring an output current value of a power supply device; and then, determining a change of the output current value in a sampling timeframe, if a slope representing the change is positive, controlling the control signal generating unit to gradually replace the fan control signal currently output to the fan with another fan control signal on the basis of a first latency, and if the slope representing the change is negative, controlling the control signal generating unit to gradually replace the fan control signal currently output to the fan with another fan control signal on the basis of a second latency. The first latency and the second latency are determined by the output current value, respectively.