US 11,950,391 B2
Fan control device with power saving mode and startup delay setting
Szu-Han Chen, Zhubei (TW)
Assigned to Nanjing Greenchip Semiconductor Co., Ltd., Nanjing (CN)
Filed by Nanjing Greenchip Semiconductor Co., Ltd., Nanjing (CN)
Filed on Oct. 24, 2020, as Appl. No. 17/079,425.
Claims priority of application No. 202011123412.6 (CN), filed on Oct. 20, 2020.
Prior Publication US 2022/0124940 A1, Apr. 21, 2022
Int. Cl. G06F 1/3206 (2019.01); F04D 27/00 (2006.01); H05K 7/20 (2006.01)
CPC H05K 7/20209 (2013.01) [F04D 27/004 (2013.01); F04D 27/008 (2013.01); G06F 1/3206 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fan control device with power saving mode and startup setting, comprising:
a control chip, the control chip at least including:
a main control circuit configured to control a speed of the fan through receiving an external voltage level, the external voltage level determined by an external voltage divider coupled to a power source;
a protection control module configured to receive an input voltage corresponding to ambient temperature for sending an alarm signal to the main control circuit while a detected ambient temperature being higher than a preset temperature; and
a sleep mode control module electrically coupled to an externally adjustable voltage threshold circuit, the externally adjustable voltage threshold circuit comprising the power source, a first resistor with one end of the first resistor coupled to the power source, a second resistor with one end of the second resistor coupled in series to the other end of the first resistor, a ground coupled to the other end of the second resistor, and a capacitor being configured to coupled in parallel to the first resistor;
wherein the sleep mode control module compares an input voltage threshold from the externally adjustable voltage threshold circuit and the input voltage detected by the protection control module, and sends a control signal to the main control circuit depended on comparing results of the sleep mode control module for controlling operation modes of the fan.