Induction Heating System with Capacitive Region Protection
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Summary
Problems
Induction heating systems face issues with thermal breakdown and efficiency loss due to operation in capacitive regions, and existing frequency detection methods are prone to errors, especially with different container types and coupling states.
Innovation solutions
A home appliance that monitors the frequency operating region of the inverter circuit, detects capacitive regions based on phase differences, and adjusts switching frequencies to prevent operation in capacitive modes, ensuring zero voltage switching and protecting the system.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the induction heating system operates in the capacitive operating region, then the electromagnetic force generation is enhanced, but the switching element undergoes thermal breakdown due to increased power loss
Why choose this principle:
The patent implements a feedback mechanism that continuously monitors the operating frequency and detects when the system enters the capacitive operating region. Based on this detection, the controller automatically adjusts the operating frequency to maintain operation in the inductive region, preventing thermal breakdown of switching elements while preserving electromagnetic force generation capability
Principle concept:
If the induction heating system operates in the capacitive operating region, then the electromagnetic force generation is enhanced, but the switching element undergoes thermal breakdown due to increased power loss
Why choose this principle:
The patent dynamically changes the operating frequency parameter based on the detected operating region. When capacitive region operation is detected, the system adjusts the frequency to shift operation back to the inductive region, thereby resolving the contradiction between power generation and switching element reliability
Application Domain
Data Source
AI summary:
A home appliance that monitors the frequency operating region of the inverter circuit, detects capacitive regions based on phase differences, and adjusts switching frequencies to prevent operation in capacitive modes, ensuring zero voltage switching and protecting the system.
Abstract
Disclosed is a home appliance for protecting an inverter circuit by monitoring a frequency operation region of the inverter circuit. The home appliance determines a capacitive region by measuring a phase difference between a switching voltage and a resonance current of the inverter circuit, and sets an operation of the inverter circuit if a frequency operation region of the inverter circuit is determined to be the capacitive region more than a predetermined number of times, thereby restricting an operation of the inverter circuit in the capacitive region.