Cookware detection circuit using half-bridge drive heating, heating device, cookware detection method, and storage medium
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Solution Overview
Problem
Existing cookware detection methods using half-bridge topology electromagnetic induction heating suffer from high power consumption and poor reliability due to continuous switching of switching transistors, leading to reduced service life of the heating device.
Innovation Solution
A cookware detection circuit using a single pulse cookware detection signal to drive a coil disk for resonant operation, with a pulse detection module counting pulse signals to determine cookware presence, reducing switching transistor usage and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous PWM signals are outputted and switching transistors are switched on and off alternately for cookware detection, then cookware detection can be performed, but power consumption increases to forty or fifty watts and reliability decreases
Solution Approach 1:
The patent applies periodic action by using a single pulse cookware detection signal instead of continuous PWM signals. The control module outputs one pulse signal to drive the coil disk for resonant operation, and the pulse detection module counts the resulting pulse signals to determine cookware presence. This periodic single-pulse approach reduces power consumption from 40-50 watts to minimal levels while maintaining detection reliability through resonant current analysis.
2Reliability
If switching transistors are continuously switched on and off for cookware detection, then detection function is maintained, but service life of switching transistors decreases
Solution Approach 1:
The patent reduces switching transistor usage by implementing periodic single-pulse detection instead of continuous switching. The control module outputs only one pulse signal per detection cycle, causing the switching transistor to switch on and off only once rather than continuously. This dramatically extends the service life of the switching transistor while maintaining cookware detection reliability through resonant current counting.
3Loss of energy
If single pulse cookware detection signal is used to drive coil disk for resonant operation, then power consumption is reduced and service life is prolonged, but detection mechanism changes from continuous monitoring to pulse counting
Solution Approach 1:
The patent substitutes the continuous mechanical switching monitoring mechanism with a pulse counting mechanism. Instead of continuously monitoring switching transistor states, the system counts the number of pulse signals generated by resonant operation of the coil disk. The pulse detection module converts resonant current into countable pulse signals, and the control module determines cookware presence based on the count value, simplifying the overall detection mechanism while reducing energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves cookware detection reliability and prolongs the service life of the electromagnetic heating device by minimizing switching transistor energy consumption and extending the lifespan through efficient resonant operation.
Implementation Method 1
drive a coil disk to perform a resonant operation through the half-bridge drive module
Implementation Method 2
detect a resonant current of the coil disk and generate pulse signals based on the resonant current of the coil disk
Data Source
AI summary
Provided is a cookware detection circuit using half-bridge drive heating, a heating device, a cookware detection method, and a storage medium. The cookware detection circuit using half-bridge drive heating includes a control module (100) and a pulse cookware detection module (300). The control module is configured to output a single pulse cookware detection signal to a half-bridge drive module (200) of the electromagnetic heating device to drive a coil disk (204) to perform a resonant operation through the half-bridge drive module (200). A pulse detection module (300) is connected to the coil disk (204) and configured to detect a resonant current of the coil disk (204) and generate pulse signals based on the resonant current of the coil disk (204). The control module (100) is connected to the pulse detection module (300), and is further configured to count the pulse signals and determine whether cookware is placed on the electromagnetic heating device based on the number of the pulse signals. The electromagnetic heating device includes the cookware detection circuit using half-bridge drive heating. The cookware detection method for the electromagnetic heating device corresponds to the cookware detection circuit. A cookware program for the cookware detection method is executed by the storage medium.