Patent ID: 11933309
Assignee: DELTA ELECTRONICS, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 7:
8. A method for controlling a fan in a fan open loop start-up stage including a first time period and a second time period, comprising:
during a full period of the first time period of the fan open loop start-up stage, a motor of the fan continuously receiving a first driving signal to drive the fan, wherein the fan at a stop status directly enters the first time period of the fan open loop start-up stage when starting to drive the fan;
during the second time period of the fan open loop start-up stage, the motor of the fan continuously receiving a second driving signal to drive the fan,
wherein a signal value of the first driving signal is initially greater than a signal value of the second driving signal, and decreases from a beginning of the first driving signal until being equal to the signal value of the second driving signal;
wherein an initial signal value of the first driving signal is at a minimum duty cycle for starting the fan, an initial signal value of the second driving signal is at a minimum duty cycle for operating the fan, and the minimum duty cycle for starting the fan is larger than the minimum duty cycle for operating the fan;
wherein the signal value of the first driving signal non-linearly decreases, the signal value of the second driving signal is an unchanged value;
wherein the first time period and the second time period are adjusted for a different fan but the sum of the first time period and the second time period is always the same.