Induction Heating Snubber Capacitor Relay Noise Control
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Solution Overview
Problem
Induction heating devices face challenges in minimizing interference noise and maintaining continuous output when heating multiple vessels with different operating frequencies, leading to unpleasant noise and inefficient output control.
Innovation Solution
The induction heating device employs a dual-resonance circuit system with snubber capacitors and relays to control pulse width and frequency, allowing for simultaneous operation of multiple working coils at a fixed frequency, reducing interference noise and ensuring continuous output across a wide range without additional noise reduction devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple vessels with different operating frequencies are heated simultaneously, then heating versatility is improved, but interference noise increases
Solution Approach 1:
The patent divides the snubber capacitor system into two separate groups: a first group of snubber capacitors connected via a relay for selective connection, and a second group permanently connected. This segmentation allows different capacitor configurations to be used depending on whether multiple vessels are being heated, thereby reducing interference noise while maintaining heating versatility
Solution Approach 2:
The patent implements dynamic control by using a relay to selectively connect the first group of snubber capacitors based on the heating mode. When multiple vessels are detected, the relay connects the first group; when a single vessel is detected, the relay disconnects it. This dynamic adjustment optimizes noise reduction without compromising the ability to heat multiple vessels simultaneously
2Power
If pulse width is adjusted to control output in low output sections, then power control precision is improved, but discharge loss increases
Solution Approach 1:
The patent prepares two groups of snubber capacitors in advance, with the second group permanently connected to handle surge voltage and inrush current. This preliminary arrangement ensures that when pulse width adjustment is used for output control, the permanently connected capacitors are already in place to manage energy discharge, thereby reducing discharge loss while maintaining control precision
3Object-generated harmful factors
If fixed frequency operation is used to minimize interference noise, then noise reduction is improved, but output control flexibility deteriorates
Solution Approach 1:
The patent uses periodic switching of the relay to connect or disconnect the first group of snubber capacitors based on the detected heating mode. This periodic action allows the system to operate at fixed frequency for noise reduction when multiple vessels are heated, while maintaining the flexibility to adjust output through pulse width modulation when a single vessel is heated
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 solution effectively removes interference noise and enables continuous operation over a wide output range, enhancing user satisfaction and product reliability by maintaining consistent performance across varying loads.
Implementation Method 1
an inverter electrically connected to the resonance circuit and configured to perform a switching operation to thereby apply a high-frequency power
Implementation Method 2
eddy current may be generated in the object made of metal based on a magnetic field that is generated around the coil based on a high-frequency power
Implementation Method 3
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field
Implementation Method 4
an inverter is electrically connected to a snubber capacitor that reduces an amount of a surge voltage and inrush current
Data Source
Figure 1~2
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Figure 4
AI summary
An induction heating device includes a first resonance circuit comprising a first working coil and a first resonance capacitor, a first inverter electrically connected to the first resonance circuit and configured to perform a first switching operation to thereby apply a first resonance current to the first working coil, a first group of snubber capacitors that are configured to be electrically connected to the first inverter, the first group of snubber capacitors comprising a first snubber capacitor and a second snubber capacitor, and a first relay configured to selectively connect the first group of snubber capacitors to the first inverter.