Induction Cooker Inverter Circuit Merging and Capacitor Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional induction heat cooking apparatuses require multiple inverter circuits and switching devices to operate multiple heating coils, leading to increased product volume and cost, as well as issues with momentary overcurrent and current ripple, which generate heat.
Innovation Solution
The apparatus employs a configuration with a minimum number of switching devices to drive multiple heating coils, utilizing a controller to manage the switching devices and resonant capacitors to reduce overcurrent and heat generation, and uses a time division or duty control method to efficiently operate the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple inverter circuits with switching devices are provided to operate multiple heating coils, then the heating function is improved, but the product volume and cost increase
Solution Approach 1:
The patent merges multiple inverter circuits into a single inverter circuit that can operate multiple heating coils. The inverter circuit includes switching devices that can be selectively activated to drive different heating coils, eliminating the need for separate inverter circuits for each coil and thereby reducing product volume.
Solution Approach 2:
The inverter circuit is designed with multi-functionality to operate multiple heating coils through a single circuit. The switching devices can be controlled to activate different heating coils as needed, making the inverter circuit universal rather than dedicated to a single coil, thus reducing the overall number of components required.
2Adaptability or versatility
If multiple inverter circuits with switching devices are provided to operate multiple heating coils, then the heating function is improved, but the production cost increases
Solution Approach 1:
The patent merges multiple inverter circuits into a single inverter circuit that can operate multiple heating coils. The inverter circuit includes switching devices that can be selectively activated to drive different heating coils, eliminating the need for separate inverter circuits for each coil and thereby reducing product volume.
Solution Approach 2:
The inverter circuit is designed with multi-functionality to operate multiple heating coils through a single circuit. The switching devices can be controlled to activate different heating coils as needed, making the inverter circuit universal rather than dedicated to a single coil, thus reducing the overall number of components required.
3Ease of operation
If switching devices are turned on or off rapidly to control heating coils, then the heating control is improved, but momentary overcurrent and current ripple increase generating heat
Solution Approach 1:
The patent introduces resonant capacitors that are charged in advance before the switching devices operate. These pre-charged capacitors provide a smooth current path during switching transitions, preventing momentary overcurrent and reducing current ripple, thereby reducing heat generation while maintaining heating control functionality.
Solution Approach 2:
The resonant capacitors act as intermediaries between the switching devices and the heating coils. They smooth out the current transitions during switching operations, mediating the electrical energy transfer to prevent harmful current ripple and overcurrent effects that would otherwise generate excessive heat.
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 configuration reduces the size and production cost of the cooking apparatus while minimizing heat generation and current ripple, enabling efficient operation of multiple heating coils with reduced switching losses.
Implementation Method 1
a high-frequency current causes to flow through a working coil or a heating coil, and an eddy current flows when a strong line of magnetic force that is accordingly generated passes through a cooking container, and thus the cooking container itself is heated
Implementation Method 2
an eddy current flows when a strong line of magnetic force that is accordingly generated passes through a cooking container
Implementation Method 3
the cooking container formed of a magnetic material generates heat due to induction heating
Data Source
Figure 1
Figure 2
Figure 3
AI summary
According to an aspect of the present invention, there is provided an induction heat cooking apparatus in which the other end of a resonant capacitor of which one end is connected with a second heating coil is connected to one of a positive power supply terminal and a negative power supply terminal of a rectifier, and the other end of a resonant capacitor of which one end is connected with a third heating coil is connected to the other one of the positive power supply terminal and the negative power supply terminal of the rectifier, and a controller controls a plurality of switching devices to simultaneously drive the second heating coil and the third heating coil which are connected in parallel.