Electrosurgical Generator DC Voltage Control
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Solution Overview
Problem
Existing electrosurgical generators are limited in their ability to supply low output power and cannot easily expand to include new operating modes with lower power settings due to the risk of the DC output voltage falling too low, leading to unreliable operation.
Innovation Solution
An electrosurgical generator with a high-voltage power supply that controls DC output voltage by switching on and off to maintain predefined maximum and minimum values, using a control unit with comparators and logical gates to manage AC output voltage and current, ensuring reliable operation across various power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the DC output voltage is reduced to enable lower power output settings, then the power output is reduced, but the DC output voltage may fall below the critical minimum causing unreliable operation
Solution Approach 1:
The control unit continuously monitors the DC output voltage and compares it with a predefined minimum threshold. When the voltage approaches or falls below this threshold, the control unit automatically adjusts the high-voltage power supply to increase the voltage back to the safe operating range, preventing unreliable operation while allowing low power settings.
Solution Approach 2:
The system dynamically adjusts the DC output voltage based on real-time operating conditions. The control unit modulates the high-voltage power supply output to maintain voltage within the safe range (above the critical minimum), enabling the system to operate reliably across a wide power range including very low power settings of 1 W.
2Reliability
If the DC output voltage is increased to ensure reliable operation, then the reliability is improved, but the power output cannot be reduced to low settings
Solution Approach 1:
The feedback control mechanism allows the system to maintain reliability by continuously monitoring DC voltage and making real-time adjustments. This eliminates the need to maintain a permanently high DC voltage, enabling low power output settings while preserving operational reliability through active voltage management.
3Adaptability or versatility
If new operating modes with lower power settings are added, then the adaptability is improved, but the risk of DC output voltage falling too low increases
Solution Approach 1:
The control unit implements a universal voltage management strategy that applies to all operating modes. The same feedback control mechanism that maintains voltage stability in high-power modes also protects low-power modes, enabling the system to safely support diverse operating modes including very low power settings of 1 W across all modes.
Solution Approach 2:
The feedback control provides a safety net for all operating modes. By continuously monitoring DC voltage and comparing it with the minimum threshold regardless of the operating mode, the system prevents voltage from falling too low even when operating in low-power modes, thus enabling expanded adaptability without compromising reliability.
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 allows for the utilization of electrosurgical generators to their full extent, enabling lower power output settings of 1 W in all operating modes while preventing the DC output voltage from falling below a critical minimum, ensuring reliable operation and efficient power delivery.
Implementation Method 1
a high-voltage power supply (12) which supplies a DC output voltage (14) during operation... The DC output voltage of the high-voltage power supply (12) is controlled by switching the high-voltage power supply on and off
Implementation Method 2
a high-frequency part (16) which receives the DC output voltage (14) from the high-voltage power supply (12) during operation, transforms the DC output voltage (14) into a high-frequency AC output voltage (20)
Implementation Method 3
an AC output voltage measuring unit (32) and one AC output current measuring unit (30)... a DC output voltage measuring unit (34) for measuring the DC output voltage (14) of the high-voltage power supply (12)
Data Source
AI summary
An electrosurgical generator with a high-voltage power supply that supplies a DC output voltage receives the DC output voltage of the high-voltage power supply and generates a high-frequency AC output voltage. When generator is operating, a control unit receives signals from an AC output voltage measuring unit and current measuring unit. The control unit limits an increase of DC output voltage of the high-voltage power supply as soon one predefined maximum value is reached or exceeded. When the generator is operating, the control unit configured to receive signals from a DC output voltage measuring unit that represent a respective current value of the DC output voltage, and to compare a respective current value of DC output voltage with a predefined minimum value for DC output voltage, and to cause the DC output voltage of the high-voltage power supply to increase as soon as it falls below the predefined minimum value.