Load detection circuit, load detection method and household appliance

A load detection circuit comprising:

• a rectification unit configured to rectify a high-level current to obtain a rectified high-level current or rectify a low-level current to obtain a rectified low-level current;
• a control unit, including an input port, a control port, a receiving port, and an output port, the input port being configured to receive a load detection instruction, and the output port being configured to output a load detection result;
• a heating unit electrically connected to the rectification unit and including two independent resonant heating circuits connected to the control port to receive a control signal from the control unit, the control signal being configured to:
• in response to the rectification unit inputting the rectified high-level current to the heating unit, controlling a first resonant heating circuit of the two resonant heating circuits to be connected;
• and
• in response to the rectification unit inputting the rectified low-level current to the heating unit, controlling a second resonant heating circuit of the two resonant heating circuits to be connected;
• and
• a reversing unit, electrically connected to the heating unit and the receiving port of the control unit, and configured to transmit a reversing signal to the control unit;
• wherein the control unit is further configured to obtain a reversing duration based on the reversing signal, and determine whether a load exists.

A load detection method applied to the load detection circuit according to claim 1, comprising:

• obtaining the load detection instruction;
• obtaining the reversing signal based on the load detection instruction;
• obtaining the reversing duration corresponding to the reversing signal;
• and
• determining that the load exists in response to the reversing duration being less than a preset reversing duration.

A household appliance comprising:

• an appliance body;
• and
• a load detection circuit arranged in the appliance body and including:
• a rectification unit configured to rectify a high-level current to obtain a rectified high-level current or rectify a low-level current to obtain a rectified low-level current;
• a control unit, including an input port, a control port, a receiving port, and an output port, the input port being configured to receive a load detection instruction, and the output port being configured to output a load detection result;
• a heating unit electrically connected to the rectification unit and including two independent resonant heating circuits connected to the control port to receive a control signal from the control unit, the control signal being configured to:
• in response to the rectification unit inputting the rectified high-level current to the heating unit, controlling a first resonant heating circuit of the two resonant heating circuits to be connected;
• and
• in response to the rectification unit inputting the rectified low-level current to the heating unit, controlling a second resonant heating circuit of the two resonant heating circuits to be connected;
• and
• a reversing unit, electrically connected to the heating unit and the receiving port of the control unit, and configured to transmit a reversing signal to the control unit;
• wherein the control unit is further configured to obtain a reversing duration based on the reversing signal, and determine whether a load exists.