公开(公告)号：US20240186862A1

公开(公告)日：2024-06-06

申请号：US18126406

申请日：2023-03-25

Applicant: Alpha Networks Inc.

Inventor： PENGFEI SONG

IPC: H02K7/14 ,  H02K11/33

CPC classification number: H02K7/14 ,  H02K11/33

Abstract: A circuit system for digitally regulating direct-current fan rotation speed includes a parallel data generator circuit, a trapezoidal resistor network circuit, a current amplifier circuit, a linear voltage-controlled resistor circuit, and a fan power converter circuit. The parallel data generator circuit can receive control data and generate corresponding digital parallel data. The trapezoidal resistor network circuit can receive the parallel data and transfer it into a corresponding analog current signal. The current amplifier circuit can receive the current signal and convert it into a corresponding voltage signal. The linear voltage-controlled resistor circuit can receive the voltage signal and generate a corresponding resistance signal according thereto. The fan power converter circuit can adjust an output voltage according to the resistance signal, generate a corresponding drive voltage value, and transmit it to a fun motor of a direct-current fan so that the fan motor operates according to the drive voltage value.