Cookware detection circuit using half-bridge drive heating, heating device, cookware detection method, and storage medium

A cookware detection method comprising:

• outputting a single pulse cookware detection signal to a half-bridge drive module of an electromagnetic heating device, to drive a coil disk of the electromagnetic heating device to perform a resonant operation through the half-bridge drive module;
• detecting a resonant current of the coil disk through a pulse detection module, and generating one or more pulse signals based on the resonant current of the coil disk;
• and
• counting the one or more pulse signals, and determining whether cookware is placed on the electromagnetic heating device based on a number of the one or more pulse signals;
• wherein:
• the half-bridge drive module includes an upper bridge switching transistor and a lower bridge switching transistor;
• and
• the pulse detection module includes:
• a load unit;
• and
• a current transformer including:
• a primary coil, an end of the primary coil being connected to a node between the upper bridge switching transistor and the lower bridge switching transistor, and another end of the primary coil being connected to the coil disk;
• and
• a secondary coil, two ends of the secondary coil being connected to the load unit.

A cookware detection circuit comprising:

• a control module configured to output a single pulse cookware detection signal to a half-bridge drive module of an electromagnetic heating device to drive a coil disk of the electromagnetic heating device to perform a resonant operation through the half-bridge drive module;
• and
• a pulse detection module configured to be connected to the coil disk and detect a resonant current of the coil disk and generate one or more pulse signals based on the resonant current of the coil disk;
• wherein:
• the control module is connected to the pulse detection module, and is further configured to count the one or more pulse signals and determine whether cookware is placed on the electromagnetic heating device based on a number of the one or more pulse signals;
• the pulse detection module includes:
• a current detection unit connected to the coil disk and configured to detect the resonant current of the coil disk to output a cookware detection current signal;
• a load unit connected to the current detection unit and configured to generate a voltage detection signal based on the cookware detection current signal;
• and
• a zero-crossing voltage comparison unit connected to the load unit, configured to output the one or more pulse signals based on the voltage detection signal, and including:
• a current limiting resistor, an end of the current limiting resistor being connected to an end of the load unit;
• a comparator, a positive input end of the comparator being connected to another end of the current limiting resistor, a negative input end of the comparator being connected to another end of the load unit, and an output end of the comparator being connected to the control module;
• a forward voltage clamp diode having an anode connected to the positive input of the comparator and a cathode connected to the negative input end of the comparator;
• and
• a reverse voltage clamp diode having an anode connected to the negative input end of the comparator and a cathode connected to the positive input end of the comparator.