Pulse Ablation Current Feedback Control for Switch Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pulse ablation instruments face issues with switching components being damaged by large current shocks and reduced ablation effectiveness due to protective resistors dividing output voltage, necessitating improved protection and voltage maintenance.
Innovation Solution
A pulse ablation instrument with a power supply circuit, pulse switching circuit, sampling circuit, and switching control circuit that samples current, reduces duty cycles based on threshold values, and adjusts drive signals to protect components and maintain voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective resistors are added to protect switching components from excessive current, then component reliability improves, but output voltage decreases leading to reduced ablation effectiveness
Solution Approach 1:
The patent implements a feedback control mechanism where the control circuit continuously monitors the current through the load and power feeding loop, compares it with a threshold value, and dynamically adjusts the duty cycle of the drive signal. This closed-loop feedback system enables real-time current regulation without requiring protective resistors, thus maintaining full output voltage while preventing overcurrent damage to switching components.
Solution Approach 2:
The patent changes the operating parameters of the pulse switching circuit by dynamically adjusting the duty cycle of the drive signal based on real-time current measurements. When current exceeds the threshold, the duty cycle is reduced to limit current flow; when current is within acceptable ranges, the duty cycle is increased to maximize power output. This parameter adjustment allows the system to adapt to varying load conditions while protecting components and maintaining ablation effectiveness.
2Reliability
If real-time current monitoring and control is implemented, then component safety improves, but device complexity increases
Solution Approach 1:
The control circuit incorporates a sampling circuit that continuously monitors current through the power feeding loop and load, compares the sampled value with a preset threshold, and automatically adjusts the duty cycle of the drive signal accordingly. This feedback mechanism provides real-time protection against overcurrent conditions while maintaining a relatively simple circuit architecture that integrates seamlessly with the existing pulse switching circuit.
Solution Approach 2:
The control circuit performs self-regulation by automatically detecting current conditions through the sampling circuit and adjusting its own output (duty cycle) based on the detected conditions. When overcurrent is detected, the control circuit autonomously reduces the duty cycle to limit current flow; when current is normal, it maintains or increases the duty cycle to optimize power delivery. This self-service capability eliminates the need for external protection circuits or manual intervention.
Data Source
AI summary
A pulse ablation instrument includes a power supply circuit, a pulse switching circuit, a sampling circuit, and a switching control circuit. The power supply circuit is configured to supply power to a load. The pulse switching circuit is connected to the power supply circuit, to regulate a current output by the power supply circuit and flowing to the load. The sampling circuit is configured to sample a current flowing through a power feeding loop of the load and obtain a sampling value. The switching control circuit is electrically connected to the sampling circuit and the pulse switching circuit, and is configured to output a drive signal which controls an operation of the pulse switching circuit according to the sampling value and reduce a duty cycle of the drive signal to reduce an output current of the power supply circuit when the sampling value is greater than a threshold value.