Patent ID: 11964291
Assignee: GRACO MINNESOTA INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F  H | IPC B  G

Claim 12:
13. A method for conserving power of a battery powered fluid sprayer that includes a reciprocating positive displacement pump, a power supply that includes a battery, an electric motor electrically connected to the power supply and to the pump, a motor controller electrically connected to the electric motor, a pressure switch, and a power controller electrically connected to the pressure switch and to the motor controller, the method comprising:
providing, by the pressure switch to the power controller, a pressure signal indicative of whether system fluid pressure of the battery powered fluid sprayer is greater than a user-adjustable pressure threshold corresponding to the system fluid pressure;
providing, by the power controller, operating power of the motor controller, the motor controller including at least one field-effect transistor and the motor controller configured to control operation of the electric motor via the at least one field-effect transistor, in response to the pressure signal indicating that the system fluid pressure is less than the user-adjustable pressure threshold such that the field-effect transistor is powered;
refraining from providing, by the power controller, the operating power of the motor controller in response to the pressure signal indicating that the system fluid pressure is greater than the user-adjustable pressure threshold such that the field-effect transistor is depowered; and
providing, by the power controller, operating power of the electric motor both when the field-effect transistor is powered and when the field-effect transistor is depowered;
wherein the operating power of the motor controller is not operating power of the electric motor.