Electrosurgical Generator Synchronization Unit
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Solution Overview
Problem
Electrosurgical generators face power losses and signal distortions due to mismatched excitation and resonant frequencies when the load changes, requiring manual tuning of the DC power supply unit and resonant circuit.
Innovation Solution
An electrosurgical generator with a high-voltage DC power supply unit and resonant circuit, equipped with a synchronization unit that uses a gradient detector to automatically synchronize actuation pulses with the voltage profile of the resonant circuit, eliminating the need for manual tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual tuning of the DC power supply unit and resonant circuit is performed, then the excitation frequency can be matched to the resonant frequency for a predetermined load, but the system requires manual intervention and cannot adapt when the load changes
Solution Approach 1:
The system performs self-tuning through the synchronization unit that automatically detects the resonant frequency and adjusts the excitation frequency accordingly. The control unit monitors the voltage profile of the resonant circuit and autonomously synchronizes the actuation pulses without requiring manual intervention, enabling the system to adapt when load changes occur
Solution Approach 2:
The synchronization unit continuously monitors the voltage profile of the resonant circuit and uses this feedback information to adjust the excitation frequency. By detecting the resonant frequency through the voltage profile characteristics and feeding this information back to the control unit, the system maintains optimal frequency matching dynamically
2Loss of energy
If the excitation frequency is fixed to match the resonant frequency for a predetermined load, then the system can operate efficiently at that specific load, but power losses and signal distortions occur when the load changes
Solution Approach 1:
The system transitions from a static fixed-frequency excitation approach to a dynamic adaptive approach. The control unit continuously adjusts the excitation frequency based on real-time detection of the resonant circuit's voltage profile, allowing the system to maintain optimal operation across varying load conditions and prevent power losses
Solution Approach 2:
The system dynamically changes the excitation frequency parameter in response to load variations. By monitoring the voltage profile of the resonant circuit and adjusting the excitation frequency to match the current resonant frequency, the system adapts to different load conditions and maintains efficient operation
3Power
If the resonant frequency is used to excite the resonant circuit, then the system achieves optimal energy transfer, but the excitation frequency must be precisely synchronized with the voltage profile reversal points
Solution Approach 1:
The synchronization unit monitors the voltage profile of the resonant circuit and uses feedback from the detected reversal points to precisely time the actuation pulses. This feedback mechanism ensures that excitation occurs at the optimal moments when the resonant circuit is most receptive, maximizing power transfer efficiency
Solution Approach 2:
The system replaces manual frequency tuning and synchronization mechanisms with an automated electronic detection and control system. The synchronization unit electronically detects voltage profile reversal points and automatically adjusts the timing of actuation pulses, eliminating the need for manual precision alignment
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 ensures consistent synchronization of actuation pulses with the resonant frequency, reducing power losses and signal distortions by automatically adjusting to changes in load, thereby enhancing the efficiency of the electrosurgical generator.
Implementation Method 1
a resonant circuit (18, 18'), which has an output transformer (20), the primary winding (22) of which is part of the resonant circuit (18, 18')
Implementation Method 2
The differentiation circuit preferably has a differential amplifier, which is connected as a differential element by means of an RC element
Implementation Method 3
The differentiation circuit is preferably connected to a zero crossing detector, which is configured to detect a respective zero crossing of the derivative signal
Implementation Method 4
an actuation circuit (30), which is configured to periodically emit actuation pulses for the purpose of exciting the resonant circuit (18, 18') using the resonant frequency thereof
Data Source
AI summary
An electrosurgical generator, which has a high-voltage DC power supply unit and a resonant circuit connected thereto. The resonant circuit has an output transformer, the primary winding of which is part of the resonant circuit and the secondary winding of which is connected to connections for an electrosurgical instrument. The resonant circuit is furthermore connected to an actuation circuit, which is configured to periodically emit actuation pulses for the purpose of exciting the resonant circuit using the resonant frequency thereof. The actuation circuit includes a synchronization unit, which is connected to the resonant circuit, and includes at least one gradient detector and is configured to synchronize actuation pulses with a reversal point of the voltage profile of the voltage in the resonant circuit.