Resonant Load Power Conversion Device with Merged Switching Arms
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Solution Overview
Problem
Existing load resonance power conversion apparatuses face limitations in reducing switching frequency and minimizing the number of main circuit conductors, leading to increased costs, space requirements, and impedance dispersion due to the large number of parallel-connected switching devices, which affects the efficiency and reliability of high-frequency induction heating applications.
Innovation Solution
A resonant load power conversion apparatus with a single-phase inverter featuring switch group circuits with N series combinations of M switching devices connected in parallel, utilizing a time-division operating method to control switching devices at a frequency inversely proportional to the product (M×N), reducing the number of main circuit conductors and minimizing impedance dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If N parallel connected switching devices are used to decrease switching frequency to 1/N cycle, then the drive frequency of switching devices is reduced, but the number of main circuit conductors increases proportionally to N
Solution Approach 1:
The patent combines multiple switching devices (N devices per arm) into a single integrated arm structure where all devices share common main circuit conductors. This merging approach allows the inverter to achieve 1/N cycle switching frequency reduction while using only the minimal number of main circuit conductors (two per phase), eliminating the proportional increase in conductors that would normally accompany parallel device expansion.
2Speed
If N parallel connected switching devices are used to decrease switching frequency, then the drive frequency is reduced, but the impedance dispersion increases due to large number of parallel devices
Solution Approach 1:
By merging N switching devices into a single integrated arm with shared common conductors, the patent eliminates the impedance dispersion problem that arises from having multiple separate parallel device paths. The unified arm structure ensures consistent current distribution and reduces impedance variations, thereby improving reliability while maintaining the 1/N frequency reduction benefit.
3Speed
If N parallel connected switching devices are used, then the switching frequency per device is decreased, but the cost increases due to more main circuit conductors
Solution Approach 1:
The patent's merged arm structure consolidates the circuit topology so that N parallel switching devices share common main circuit conductors rather than each device requiring dedicated conductors. This dramatically reduces the total number of conductors needed from proportional to N down to a fixed minimal number, thereby reducing material costs and manufacturing complexity while preserving the frequency reduction advantage.
4Speed
If N parallel connected switching devices are used to achieve high frequency operation, then the resonance frequency can be met, but the space requirements increase
Solution Approach 1:
By integrating N switching devices into a single compact arm structure with shared conductors, the patent reduces the spatial footprint compared to having N separate parallel device arrangements. The merged configuration allows high resonance frequency operation to be achieved within a more compact space, as the common conductors and shared device housing eliminate the need for extensive separate routing and mounting areas for each individual device.
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 decreases the switching frequency and reduces the number of main circuit conductors, lowering costs and space requirements while maintaining efficient high-frequency operation and reducing impedance dispersion, thus enhancing the reliability and efficiency of the power conversion process.
Implementation Method 1
leads an alternating current produced by the on/off control of each switching device in the single-phase inverter, through a LC resonance circuit of coil and capacitor, applies the thus-generated alternating magnetic field to an object to be heated (electric conductor) thereby to produce eddy currents
Implementation Method 2
heats the object from the inside with the Joule heat generated in the object by the eddy currents
Implementation Method 3
applies the thus-generated alternating magnetic field to an object to be heated (electric conductor) thereby to produce eddy currents
Implementation Method 4
The resonant load power conversion apparatus outputs a rectangular wave voltage at a resonance frequency by on/off control of each switching device of the single-phase inverter
Data Source
AI summary
A resonant load power conversion apparatus is provided to lower a switching frequency of each switching device and to reduce the number of main circuit conductors. The conversion apparatus includes a single-phase inverter having a dc input side (Vdc) connected with a dc voltage source and an output side (Vout) connected with a resonant load and outputting a rectangular wave voltage with a resonance frequency. Upper and lower arms on the input side and output side of the single-phase inverter are connected, respective, with switch group circuits 100U, 100V, 100V and 100V each of which includes N series combinations (N is an integer equal to or greater than 2) of two switching devices, connected in parallel with each other by main circuit conductors. The switching devices of the switch group circuits are controlled in a time division switching control mode with a control section.