MOSFET Gate Drive Boost Converter for Battery Management
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Solution Overview
Problem
Existing battery management systems for CPR devices face challenges in providing a reliable, high-power, and lightweight power supply that can sustain extended use without voltage or current drop-off, particularly due to the need for efficient n-FET switching and adequate gate drive voltage, which is not met by conventional p-FET designs.
Innovation Solution
A battery pack with a battery management system that includes a boost converter to supply a sufficient gate drive voltage to n-channel MOSFETs, ensuring maximum current flow and incorporating processors for monitoring and controlling battery operations, while also isolating terminals to prevent inadvertent shorting, and utilizing n-FETs to minimize internal resistance and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional p-FET designs are used for battery management, then the device structure is simpler, but the internal resistance is higher and heat generation is excessive
Solution Approach 1:
The patent changes the electrical parameters by switching from p-FET to n-FET transistors. This parameter change reduces the on-resistance significantly, allowing for lower internal resistance and reduced heat generation in the battery management system while maintaining acceptable structural complexity through the use of a boost converter circuit.
2Object-generated harmful factors
If n-FETs are used to minimize internal resistance, then internal resistance and heat generation are reduced, but gate drive voltage requirements exceed available battery voltage
Solution Approach 1:
The patent introduces a boost converter as an intermediary device between the battery and the n-FET gate. This converter mediates the voltage mismatch by stepping up the available battery voltage to the higher level required for proper n-FET gate drive, enabling the use of low-resistance n-FETs without exceeding voltage constraints.
Solution Approach 2:
The boost converter dynamically changes the voltage parameter to match the requirements of the n-FET gate drive. By converting the battery voltage to a higher level when needed, the system can utilize n-FETs for their low resistance benefits while satisfying the higher gate voltage requirement through parameter transformation.
3Productivity
If a boost converter is added to provide gate drive voltage, then n-FET switching efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic voltage supply system where the boost converter is controlled based on the operational state of the battery management circuit. The converter dynamically adjusts its operation to provide gate drive voltage only when n-FET switching is required, optimizing switching efficiency while managing circuit complexity through conditional activation rather than continuous operation.
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 solution provides a high-performance battery pack capable of delivering high power and current for extended periods, ensuring reliable operation of CPR devices, with a compact and lightweight design that maintains power consistency and prevents battery discharge hazards.
Implementation Method 1
a voltage boosting circuit, such as a boost converter 410, is included to boost the battery voltage to a sufficient level to drive the gates of the n-FETs 340, 350, 360
Data Source
AI summary
A boost converter for driving the gate of n-channel MOSFET power devices is described. The boost converter includes a monitoring circuit and a kick start circuit to quickly bring the boost converter online when required to drive the MOSFET on.