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

Claim 0:
1. A fan, comprising:
an impeller;
a control circuit comprising a control unit; and
a motor, connected to the impeller and electrically connected to the control circuit, the motor configured to continuously receive a first driving signal from the control unit to drive the impeller during a full period of a first time period of a fan open loop start-up stage, and configured to continuously receive a second driving signal from the control unit to drive the fan during a second time period of the fan open loop start-up stage, 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;
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.