Surface cleaning appliance
AssigneeDyson Technology Limited
InventorsLibo Zheng, Yongji Zhou, James Douglas Chisholm, David John Hawker
Life of this patent
Estimating the term…
Abstract
A surface cleaning appliance having a cleaner head that includes an agitator and a motor for driving the agitator. The appliance includes a switch coupling the motor to a supply voltage, a voltage sensor for measuring the magnitude of the supply voltage, a current sensor for measuring the magnitude of current through the motor, and a controller configured to output a PWM signal for controlling the switch. The controller then adjusts the duty cycle of the PWM signal in response to changes in the supply voltage and in response to changes in the current through the motor.
Claims12
A surface cleaning appliance comprising:
- a cleaner head comprising an agitator and a motor for driving the agitator;
- a switch coupling the motor to a supply voltage;
- a voltage sensor for measuring the magnitude of the supply voltage;
- a current sensor for measuring the magnitude of current through the motor;
- and
- a controller configured to output a PWM signal for controlling the switch,
- wherein the controller adjusts the duty cycle of the PWM signal in response to changes in the supply voltage and in response to changes in the current through the motor.
A surface cleaning appliance comprising:
- a cleaner head comprising an agitator and a motor for driving the agitator;
- a switch coupling the motor to a supply voltage;
- a voltage sensor for measuring the magnitude of the supply voltage;
- a current sensor for measuring the magnitude of current through the motor;
- and
- a controller configured to output a PWM signal for controlling the switch,
- wherein the controller increases the duty cycle of the PWM signal in response to a decrease in the supply voltage and in response to an increase in the motor current.
A surface cleaning appliance comprising:
- a cleaner head comprising an agitator and a motor for driving the agitator;
- a switch coupling the motor to a supply voltage;
- a voltage sensor for measuring the magnitude of the supply voltage;
- a current sensor for measuring the magnitude of current through the motor;
- and
- a controller configured to output a PWM signal for controlling the switch,
- wherein the controller increases the duty cycle of the PWM signal in response to a decrease in the supply voltage and in response to an increase in the motor current so as to maintain a constant input voltage to the motor.
Dependencies are inferred from the claim text.