Ladder Bridge Defibrillator Circuit for Stable High-Voltage Switching
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Solution Overview
Problem
H bridge circuits are not stable at high voltages, necessitating a more reliable configuration for defibrillators that can safely handle and switch high voltages.
Innovation Solution
A ladder bridge circuit with a control unit managing switching elements to ensure stable operation by providing alternative current paths and dispersing surge voltages across multiple paths, reducing the likelihood of switching element failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an H bridge circuit is used for voltage switching, then the circuit structure is simple, but the circuit becomes unstable at high voltages
Solution Approach 1:
The H bridge circuit is divided into multiple independent circuit units (first circuit unit with switching elements 1-2, second circuit unit with switching elements 3-4, third circuit unit with switching elements 5-6, and fourth circuit unit with switching elements 7-8). Each unit can operate independently, and the segmentation allows the circuit to handle high voltages more reliably by distributing the voltage stress across multiple units rather than concentrating it in a single H bridge structure.
2Reliability
If a ladder bridge circuit is used to improve high voltage stability, then the reliability at high voltage increases, but the device complexity increases
Solution Approach 1:
Multiple circuit units are merged in a specific configuration where the first and second circuit units are connected in parallel between one end of the high voltage capacitor and the third circuit unit, while the third and fourth circuit units are connected in series. This merging creates a ladder bridge structure that maintains high voltage stability through redundancy while organizing the complexity in a systematic manner.
Solution Approach 2:
The ladder bridge circuit provides multiple current paths that can be activated depending on the operating conditions. The circuit can switch voltage in various directions (forward, reverse, and bidirectional control) and provides both normal operation paths and backup paths for fault tolerance, making the circuit structure universally applicable for various high voltage switching requirements.
3Reliability
If multiple switching elements are used in the ladder bridge circuit, then high voltage switching stability improves, but the likelihood of component failure increases
Solution Approach 1:
The circuit is designed with redundant switching elements and multiple current paths before any failure occurs. If one switching element fails, alternative paths through other switching elements remain available to maintain circuit operation. This beforehand cushioning ensures that the failure of individual components does not lead to complete system failure, thereby reducing the harmful impact of component failures while maintaining voltage switching stability.
4Reliability
If switching elements are controlled to manage surge voltages, then high voltage stability improves, but the control complexity increases
Solution Approach 1:
The control system dynamically adjusts the on/off states of switching elements based on real-time operating conditions. The control unit monitors the circuit state and selectively activates specific switching elements to direct current flow through appropriate paths, enabling adaptive management of surge voltages. This dynamic control allows the system to respond to varying conditions while maintaining stability without requiring overly complex predetermined control logic.
Data Source
Figure 1~2
Figure 3a
Figure 3b
AI summary
A defibrillator according to one embodiment of the present invention comprises: a high voltage capacitor charged through a battery power source; a ladder bridge circuit connected to one end of the high voltage capacitor; a control unit for controlling an on/off operation of switching elements constituting the ladder bridge circuit, wherein the ladder bridge circuit comprises: a first circuit unit and a second circuit unit, one ends of which are connected to one end of the high voltage capacitor and which are connected in parallel to each other; and a third circuit unit connected in series to the other ends of the first circuit unit and the second circuit unit, wherein the first circuit unit comprises a first switching element having one end connected to the high voltage capacitor and a second switching element connected in series to the other end of the first switching element; the second circuit unit comprises a third switching unit connected to the high voltage capacitor and a fourth switching element connected in series to the other end of the third switching element; and the third circuit unit comprises a fifth switching element and a sixth switching element, one ends of which are connected in parallel to the other ends of the first circuit unit and the second circuit unit.