Induction Heating Control Device for Individual Temperature Regulation
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Solution Overview
Problem
Existing control devices for induction heating units cannot individually control the temperature rise on both sides of a material being heated, as they apply the same voltage to both units, leading to an inability to prevent abnormal mutual induction phenomena.
Innovation Solution
A control device that synchronizes the operation frequency and phase of the output currents between a master and slave inverter, allowing for individual control of temperature rise on each side by using reverse magnetic flux directions in C-shaped heating units and forming specific loop circuits to prevent ground currents and arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same voltage is applied to both induction heating units, then the control device is simple, but individual control of temperature rise on each side is impossible
Solution Approach 1:
The patent divides the control system into two independent inversioners (first inverter and second inverter), each capable of independently controlling its respective induction heating unit. This segmentation allows individual temperature control on each side of the material while maintaining relatively simple overall device architecture through modular design.
Solution Approach 2:
The patent implements dynamic control by allowing each inverter to independently adjust its output voltage and phase angle in real-time. The control unit can dynamically modify operating parameters of each inverter based on temperature feedback from temperature detection units, enabling precise individual temperature control.
2Area of stationary object
If induction heating units are arranged in the vicinity of both side portions, then heating coverage is improved, but abnormal mutual induction phenomenon occurs
Solution Approach 1:
The patent applies preliminary anti-action by introducing a phase angle control mechanism that proactively prevents abnormal mutual induction. The control unit adjusts the phase angle between the two inversioners to ensure that magnetic flux from one inverter does not induce harmful currents in the other inverter, thereby eliminating the harmful effect before it can occur.
Solution Approach 2:
The patent uses the phase angle difference as an intermediary parameter to mediate between the two induction heating units. By controlling the phase angle relationship between the inversioners, the system enables both units to operate simultaneously without causing harmful mutual induction, effectively using phase control as a mediating mechanism.
3Reliability
If phases of current are synchronized, then abnormal mutual induction is prevented, but individual control of power supplied to each unit is impossible
Solution Approach 1:
The patent implements dynamic phase angle control where the control unit can independently adjust the phase angle of each inverter relative to the other. This dynamic adjustment allows the system to prevent abnormal mutual induction by optimizing phase relationships while simultaneously enabling individual power control through independent voltage and phase modulation of each inverter.
Solution Approach 2:
The patent changes multiple parameters simultaneously - both voltage magnitude and phase angle - for each inverter independently. This multi-parameter control allows the system to maintain reliable operation by preventing mutual induction through phase angle optimization while achieving individual power control through independent voltage adjustment of each inverter.
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
Enables individual control of temperature rise on both sides of the material while preventing abnormal mutual induction, ensuring efficient heating without arc formation or power inefficiencies.
Implementation Method 1
a first C-shaped heating unit (5) and a second C-shaped heating unit (6) which are arranged in the vicinity of both side portions of the material (1) to be heated, respectively
Implementation Method 2
phases of current of the two induction heating units are synchronized. For this reason, an abnormal mutual induction phenomenon does not occur between the two induction heating units
Data Source
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AI summary
Provided is a control device for induction heating units which is capable of individually controlling amounts of temperature rise in one side portion and the other side portion of a material to be heated while preventing the occurrence of an abnormal mutual induction phenomenon between two induction heating units. To this end, the control device includes: a master frequency control part that sets an operation frequency of a master inverter, which drives a master C-shaped induction heating unit provided on one side of a material to be heated, so that a phase of an output voltage and a phase of an output current from the master inverter are synchronized; a slave frequency control part that synchronizes an operation frequency of a slave inverter, which drives a slave C-shaped induction heating unit provided on the other side of the material to be heated, with the operation frequency of the master inverter; a slave current phase control part that synchronizes a phase of an output current from the slave inverter with the phase of the output current from the master inverter; a master voltage control part which sets a pulse width of the output voltage from the master inverter; and a slave voltage control part which sets a pulse width of an output voltage from the slave inverter.