Gate Drive Charge Pump Bias Control for NFET Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery management systems face inefficiencies in dynamically adjusting charge pump voltage to optimize NFET efficiency and reduce leakage currents based on the operational state of battery packs, leading to suboptimal power usage and battery life.
Innovation Solution
Implementing a system with current sense circuitry and controllers that dynamically adjust the charge pump voltage in response to measured load currents, switching between high and low voltage modes to maximize efficiency during active use and minimize leakage during idle states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charge pump voltage is increased to improve NFET efficiency during active discharge, then the power consumption increases and leakage currents increase during idle states
Solution Approach 1:
The charge pump voltage is made dynamic rather than fixed. The system switches between high voltage mode (improving NFET efficiency during active discharge) and low voltage mode (reducing leakage currents during idle states). This dynamic adjustment resolves the contradiction by adapting the voltage level to the operational state of the battery pack.
Solution Approach 2:
The system changes the voltage parameter of the charge pump based on operational conditions. By monitoring the operational state and adjusting the charge pump voltage accordingly, the system optimizes NFET efficiency when needed while minimizing energy loss through leakage currents during idle periods.
2Reliability
If the charge pump voltage is maintained at high level to ensure optimal NFET performance, then power consumption increases during idle states
Solution Approach 1:
The charge pump voltage transitions from a static high level to a dynamic level that adjusts based on operational state. During active discharge, high voltage ensures optimal NFET performance; during idle states, low voltage reduces power consumption, resolving the contradiction between reliability and energy usage.
Solution Approach 2:
The voltage parameter is changed based on operational requirements. The system monitors whether the battery pack is in active discharge or idle state and adjusts the charge pump voltage accordingly, ensuring NFET performance when needed while minimizing power consumption during idle periods.
3Productivity
If the charge pump voltage is dynamically adjusted based on load current, then system complexity increases
Solution Approach 1:
The system uses feedback from current sense circuitry that monitors load current to control the charge pump voltage. The controller receives current information and adjusts the voltage accordingly, implementing dynamic power efficiency optimization through a feedback-based control mechanism.
Solution Approach 2:
The system monitors its own operational state through integrated current sense circuitry and automatically adjusts the charge pump voltage without external intervention. This self-service approach optimizes power efficiency while managing complexity through integrated control within the battery management system.
Data Source
AI summary
In an example, a system includes a charge pump. The system includes a transistor coupled to a power terminal, the transistor gate coupled to a charge pump output. The system includes current sense circuitry having a power input, a load input and a sense output, where the power input is coupled to the power terminal, the current sense circuitry is configured to provide a sense signal at the sense output, and the sense signal represents a polarity and a magnitude of a current at the load input. The system includes a controller having a sense input coupled to the sense output and a control output coupled to the control input, where the controller is configured to provide a control signal at the control output responsive to the sense signal, and the charge pump is configured to adjust a voltage at the charge pump output responsive to the control signal.