Battery Pack Insertion Detection Circuit for CPR Devices
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Solution Overview
Problem
Existing CPR devices face challenges in maintaining consistent and prolonged chest compressions due to limited battery power and reliability, particularly requiring a lightweight, high-current power supply that prevents accidental discharge and ensures consistent operation for extended periods.
Innovation Solution
A high-performance battery pack with a battery management system that monitors and controls charging and discharging, includes a detection circuit to prevent current flow unless properly inserted, and uses Lithium-Ion chemistry with n-FET switches to manage power efficiently, ensuring reliable operation and preventing accidental discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lightweight battery is used to enhance portability, then the weight is reduced, but the power delivery capability and duration are limited
Solution Approach 1:
The battery system is segmented into multiple individual battery cells (e.g., five 18650 cells) that can be independently managed and connected in series/parallel configurations. This segmentation allows optimization of both weight and power delivery by selecting appropriate cell arrangements and managing each cell's contribution to the overall power output.
Solution Approach 2:
The battery management system dynamically changes electrical parameters (voltage, current, resistance) by controlling MOSFET switches to optimize power delivery. The system adjusts these parameters in real-time based on load requirements, enabling a lightweight battery to deliver high power when needed while maintaining acceptable weight.
2Reliability
If complex battery management circuitry is added to manage charging and discharging, then the reliability and power management are improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical relay-based switching systems with solid-state MOSFET (metal-oxide-semiconductor field-effect transistor) switches. These electronic switches provide reliable power management with simpler circuitry, reduced component count, and improved response time while maintaining high reliability for charging and discharging control.
Solution Approach 2:
The battery management integrated circuit performs multiple functions within a single device: it manages charging, controls discharging, monitors cell voltages, detects insertion status, and controls power delivery through MOSFETs. This multi-functionality reduces overall system complexity while improving reliability through centralized management.
3Use of energy by moving object
If battery terminals are always connected to power supply terminals, then power availability is improved, but the risk of accidental shorting and discharge increases
Solution Approach 1:
The system performs preliminary detection of proper battery insertion through detection circuits that check terminal connections before enabling power delivery. The MOSFET switches are kept in a high-impedance off-state until insertion is confirmed, preventing accidental discharge while ensuring rapid power availability once properly connected.
Solution Approach 2:
The patent introduces MOSFET switches as intermediary components between the battery terminals and the power supply terminals. These electronic switches act as controllable mediators that can rapidly transition from blocking to conducting state, enabling power availability when needed while preventing accidental shorting through controlled impedance management.
4Power
If high current capability is designed into the battery to power mechanical compression devices, then the power output is improved, but the internal resistance and heat generation increase
Solution Approach 1:
The battery management system dynamically adjusts the internal resistance characteristics by controlling MOSFET switch timing and configuration. During high-current discharge events, the system optimizes the conduction path and switching时序 to minimize resistive losses, enabling high current capability while reducing energy loss through adaptive control rather than fixed design parameters.
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
The battery pack provides sustained high power to CPR devices for extended periods, ensuring consistent chest compressions and preventing accidental discharge, thus enhancing patient care and device reliability.
Implementation Method 1
A switch means (n-FET) is disposed between the positive side of the at least one battery cell and the positive terminal of the connector
Implementation Method 2
A battery detection circuit is provided which detects a voltage between the positive and negative terminals of the battery pack
Data Source
AI summary
A rechargeable power cell having no voltage across its positive and negative power terminals unless the power cell is inserted into a device configured to accept the power cell is described. The power cell includes a battery management processor and battery insertion detection circuitry that cooperate to determine when the power cell is inserted into the device and then drive an electronic switch to provide for conduction of current from the power cell to the positive terminal of the cell.