Induction Heating Fusing Device Error Detection
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Solution Overview
Problem
Existing methods for detecting errors in electronic devices, particularly resonance circuits, may fail to guarantee that the driving frequency is always higher than the resonance frequency, leading to the risk of excess current flowing into circuits and potential damage due to varying resonance frequencies and inconsistent power sources.
Innovation Solution
An induction heating fusing device with a controller that alternately drives a first driver circuit in A-mode and a second driver circuit in B-mode, using different power sources and frequencies to determine errors based on power consumption values and current phases, ensuring the current magnitude is limited to a preset level in B-mode and adjusting frequencies to prevent excess current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the driving frequency is set higher than the resonance frequency to prevent excess current, then circuit safety is improved, but component damage and characteristic changes may occur, allowing the resonance frequency to rise and excess current to flow
Solution Approach 1:
The patent uses preliminary action by detecting component errors in B-mode before they cause damage. The controller monitors the resonance circuit for errors such as capacitor leakage or inductor short circuits while driving at higher frequency, and switches to A-mode only when the circuit is confirmed healthy. This prevents component damage by identifying degradation early.
Solution Approach 2:
The patent applies feedback by using the error detection results from B-mode to control the switching to A-mode. The controller continuously monitors circuit health and adjusts operation mode based on detected errors. This feedback mechanism ensures components are not damaged by excessive current while maintaining optimal fusing performance.
2Difficulty of detecting and measuring
If error detection is performed by examining circuit components, then error detection capability is improved, but the complexity of the electronic device increases
Solution Approach 1:
The patent applies universality by using the resonance circuit itself for both normal fusing operation and error detection. The same inductor and capacitor serve dual purposes: fusing toner during A-mode and detecting errors during B-mode. This eliminates the need for separate detection components, reducing device complexity while maintaining strong error detection capability.
Solution Approach 2:
The patent implements self-service by having the resonance circuit detect its own errors. The controller switches to B-mode and uses the circuit's own electrical characteristics (current, voltage, frequency response) to identify component failures. This self-diagnosis capability reduces the need for external monitoring equipment, simplifying the overall device structure.
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
This approach effectively reduces the risk of excess current and circuit damage by ensuring the current magnitude is controlled in B-mode, even when the driving frequency is lower than the resonance frequency, thereby extending the lifespan of electronic devices.
Implementation Method 1
an induction heating fusing device that fuses the image onto the printing paper and includes: a resonance circuit including an inductor that is inductively heated by a current to generate fusing heat
Implementation Method 2
an inductor that is inductively heated by a current to generate fusing heat
Data Source
AI summary
An apparatus includes an image former and an induction heating fusing device. The image former forms an image. The induction heating fusing device fuses the image formed by the image former onto paper. Whether the induction heating fusing device has an error is determined by limiting a current applied to a resonance circuit included in the induction heating fusing device to less than a certain level.