Abstract: An intelligent electric kettle includes a heating element for heating water contained in the intelligent electric kettle, a sensor for sensing the temperature of the water, and a control unit being configured to collect data during the operation of the intelligent electric kettle. The control unit is also configured to execute a predetermined program and calculate a cut-off temperature based on the data and a predetermined target temperature. The control unit is further configured to turn off the electric power provided to the heating element when the temperature of the water sensed by the sensor is equal to or greater than the calculated cut-off temperature.

Abstract: An electric motor protection system for protecting an electric motor of a household appliance includes a temperature sensor for sensing a temperature of the electric motor, a motor speed sensor for sensing a speed of the electric motor, a current sensing circuit for sensing an electric current supplied to the electric motor, a power control device for controlling the electrical power supplied to the electric motor, and a signal processing unit electrically connected to the temperature sensor, the motor speed sensor, the current sensing circuit, and the power control device. The signal processing unit is configured to make calculations and judgments based on the measurements of the temperature sensor, the motor speed sensor and the current sensing circuit, and a plurality of predetermined values, and to control the power control device accordingly so as to protect the motor from overheating, being overloaded, or driven by excessive current.

Abstract: An electronic hand mixer for processing food materials is provided. The electronic hand mixer includes one or more beaters, a housing, and a drive motor mounted in the housing. The drive motor is adapted to apply rotational force to the beaters. The electronic hand mixer also includes a power control device for controlling electrical power supplied to the drive motor, a keypad for receiving instructions entered by users, a microprocessor for processing and carrying out the instructions and sending signals to the power control device, and a memory for storing the instructions. The instructions include at least one user-defined mixing course for conducting a mixing operation. The user-defined mixing course includes one or more mixing operations, and each of the mixing operations includes a user-defined running speed of the drive motor associated with a user-defined running period of time of the drive motor.

Abstract: A power saving system for a household electric appliance includes a signal processing unit, a step down network having an adjustable impedance for stepping down an input voltage, and an impedance control switch electrically connected with the step down network and configured for controlling the impedance of the step down network. The signal processing unit is electrically connected to impedance control switch and configured to monitor the working condition of the household electric appliance, calculate the current demanded by the household electric appliance at a next moment, and transmit a signal to the impedance control switch so as to control the impedance control switch to adjust the impedance of the step down network according to the calculation.

Abstract: A non-contact liquid level sensing system for an electric appliance is provided. The electric appliance includes a liquid container for containing liquid. The non-contact liquid level sensing system includes a micro-controller and a plurality of sensors vertically aligned and mounted to the inside of the liquid container. The micron-controller includes a non-volatile memory for storing data. Each of the sensors includes a circuit board, a sensor pad made of a conductive material mounted on the circuit board, and a cover plate made of a dielectric material covering and being in direct contact with the sensor pad. The micro-controller is electrically connected with the sensors, and configured to measure the capacitance between the sensor pad of each sensor and a reference electric potential, and to determine a liquid level in the liquid tank based on the measured capacitance and the data stored in the non-volatile memory of the micro-controller.

Abstract: An intelligent electric kettle includes a heating element for heating water contained in the intelligent electric kettle, a sensor for sensing the temperature of the water, and a control unit being configured to collect data during the operation of the intelligent electric kettle. The control unit is also configured to execute a predetermined program and calculate a cut-off temperature based on the data and a predetermined target temperature. The control unit is further configured to turn off the electric power provided to the heating element when the temperature of the water sensed by the sensor is equal to or greater than the calculated cut-off temperature.

Abstract: A power saving system for a household electric appliance includes a signal processing unit, a step down network having an adjustable impedance for stepping down an input voltage, and an impedance control switch electrically connected with the step down network and configured for controlling the impedance of the step down network. The signal processing unit is electrically connected to impedance control switch and configured to monitor the working condition of the household electric appliance, calculate the current demanded by the household electric appliance at a next moment, and transmit a signal to the impedance control switch so as to control the impedance control switch to adjust the impedance of the step down network according to the calculation.

Abstract: An electric motor protection system for protecting an electric motor of a household appliance includes a temperature sensor for sensing a temperature of the electric motor, a motor speed sensor for sensing a speed of the electric motor, a current sensing circuit for sensing an electric current supplied to the electric motor, a power control device for controlling the electrical power supplied to the electric motor, and a signal processing unit electrically connected to the temperature sensor, the motor speed sensor, the current sensing circuit, and the power control device. The signal processing unit is configured to make calculations and judgments based on the measurements of the temperature sensor, the motor speed sensor and the current sensing circuit, and a plurality of predetermined values, and to control the power control device accordingly so as to protect the motor from overheating, being overloaded, or driven by excessive current.

Abstract: An electronic hand mixer for processing food materials is provided. The electronic hand mixer includes one or more beaters, a housing, and a drive motor mounted in the housing. The drive motor is adapted to apply rotational force to the beaters. The electronic hand mixer also includes a power control device for controlling electrical power supplied to the drive motor, a keypad for receiving instructions entered by users, a microprocessor for processing and carrying out the instructions and sending signals to the power control device, and a memory for storing the instructions. The instructions include at least one user-defined mixing course for conducting a mixing operation. The user-defined mixing course includes one or more mixing operations, and each of the mixing operations includes a user-defined running speed of the drive motor associated with a user-defined running period of time of the drive motor.

Abstract: An air purifier includes a cabinet, an electrically driven fan, a replaceable filter element, and an air quality sensor. A display provides a visual indication of the air quality condition. A microprocessor is programmed to control the speed of the fan automatically according to the air quality condition. The microprocessor also computes when the filter element must be changed by totalling the time of operation and its speed (which equals air quality) so that for example the filter element will be changed more often (used for less aggregate time) when the air purifier is operated in a poor quality environment.

Abstract: An air purifier comprises a cabinet an electrically driven fan a replaceable filter element and an air quality sensor A display provides a visual indication of the air quality condition. A microprocessor is programmed to control the speed of the fan automatically according to the air quality condition. The microprocessor also computes when the filter element must be changed by totalling the time of operation and its speed (which equals air quality) so that for example the filter element will be changed more often (used for less aggregate time) when the air purifier is operated in a poor quality environment.

Abstract: In an otherwise well-known electric pop-up toaster, an auxiliary power switch is provided and is arranged to be opened by a timer after each toasting cycle. This ensures, in contrast to the well-known toaster arrangements, that power is interrupted to heating elements even if a carriage supporting slices of toast fails to move up at the end of a toasting cycle.

Abstract: In an otherwise well-known electric pop-up toaster, an auxiliary power switch is provided and is arranged to be opened by a timer after each toasting cycle. This ensures, in contrast to the well-known toaster arrangements, that power is interrupted to heating elements even if a carriage supporting slices of toast fails to move up at the end of a toasting cycle.

Abstract: A toast oven is controlled by a microprocessor that is programmed to selectively determine each toasting time in accordance with a user selected toasting requirement and with an initial oven temperature. In this way the toasting time is automatically adjusted to take into account the oven temperature at the beginning of each toasting cycle. The user therefore does not have to make subjective manual adjustments to produce consistent toasting results. A time display on a panel, controlled by the microprocessor, indicates the remaining toasting time during each toasting cycle.