Electrosurgical Generator Power Layout for EMI and Isolation
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Solution Overview
Problem
Existing electrosurgical generators face challenges in reducing electromagnetic interference and costs due to the need for multiple galvanically isolated power supplies for various function modules, leading to increased efforts and electromagnetic emissions.
Innovation Solution
A centralized AC generator with a decentralized transformer configuration provides galvanically isolated power to function modules, reducing electromagnetic interference and costs by consolidating AC generation and allowing for efficient voltage stabilization and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each function module is provided with its own galvanically isolated power supply, then patient safety and functional independence are improved, but component count, cost, and electromagnetic emissions increase
Solution Approach 1:
The system is segmented into a centralized AC generator and multiple function modules, each with its own transformer. This segmentation allows galvanic isolation at the module level while consolidating the AC generation function, thereby maintaining patient safety without requiring each module to have a complete independent power supply.
Solution Approach 2:
The AC generation function is merged into a single centralized unit that serves all function modules. This consolidation reduces the total number of AC generators from multiple (one per module) to one, thereby reducing component count, cost, and electromagnetic emissions while still providing galvanic isolation through individual transformers at each module.
2Adaptability or versatility
If multiple AC generators are provided for different function modules, then functional independence is improved, but electromagnetic emissions and interference increase
Solution Approach 1:
The harmful AC generation function is extracted from the individual function modules and relocated to a centralized unit. This extraction eliminates the multiplication of electromagnetic sources while preserving the functional independence of each module through their individual transformers and galvanic isolation.
3Adaptability or versatility
If each function module has its own AC generation, then module independence is improved, but cost and manufacturing effort increase
Solution Approach 1:
The centralized AC generator serves as a universal power source for all function modules. This multi-functional design allows a single AC generation unit to support multiple different modules, thereby reducing manufacturing complexity and cost while maintaining the ability to independently configure and assemble different module combinations.
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 decreases electromagnetic emissions, simplifies voltage stabilization, and reduces component count and space requirements, enhancing the reliability and efficiency of electrosurgical generators.
Implementation Method 1
each of the function modules is provided individually with a galvanically separated local operating power supply comprising a transformer
Data Source
AI summary
An electrosurgical generator for outputting a HF voltage to an electrosurgical instrument includes a power supply unit, an inverter unit generating the HF voltage, a base module and a plurality of function modules for performing various functions of the electrosurgical generator, at least one thereof being configured for controlling a user interface. Each of the function modules features a galvanically separated local operating power supply includes a transformer being fed by the base module having an operating power distribution unit. A central AC generator is provided generating AC voltage supplied to the operating power distribution unit. The transformers are decentralized at each of the function modules. This combination of centralized AC generation and decentralized transformers increases efficiency, reduces space demand and facilitates effective shielding, thereby providing a more economical, compact and EMR improved electrosurgical generator.