Power Switch Gate-Charge Sensing for Overcurrent Protection
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Solution Overview
Problem
Current power switches in automotive and similar applications lack efficient current sensing and overcurrent protection mechanisms, particularly in low power modes, leading to potential damage and inefficiencies in current handling across various vehicle states.
Innovation Solution
A power switch with multiple states (OFF, first IDLE, first ON, second ON, and optional second IDLE) that includes isolated gate electronic switches, a measuring device for charge determination, and a logic unit for autonomous state transitions based on current and temperature thresholds, enabling flexible current sensing and protection without interrupting power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power switches are used without efficient current sensing mechanisms, then device complexity is reduced, but reliability deteriorates due to lack of overcurrent protection
Solution Approach 1:
The patent combines the current sensing function with the existing power switch structure by utilizing the gate charge characteristics of the electronic switches. The measuring device integrates with the energy supply to monitor gate charge levels, which directly reflect the current state, eliminating the need for separate current sensing components and maintaining reliability while controlling complexity.
Solution Approach 2:
The patent introduces a gate charge as an intermediary parameter to indirectly sense the current state. Instead of directly measuring current, the system measures the charge at the isolated gate, which serves as a mediator that correlates with the current flowing through the switch. This approach provides reliable overcurrent protection through a simplified measurement mechanism.
2Adaptability or versatility
If multiple electronic switches with isolated gates are used for flexible current handling, then adaptability is improved, but use of energy increases due to charge management requirements
Solution Approach 1:
The patent implements dynamic operation of the electronic switches by enabling autonomous transitions between different states (OFF, first IDLE, first ON, second ON). The logic unit dynamically adjusts the switching configuration based on real-time conditions such as current levels and temperature, allowing the system to adapt to varying load requirements while optimizing energy consumption by switching only when necessary.
Solution Approach 2:
The patent changes the operational parameters of the electronic switches by utilizing different charge levels at the isolated gates to represent different operating states. The measuring device monitors gate charge, and the energy supply adjusts charge provision based on determined charge levels, enabling the system to operate in multiple modes (different current handling states) by varying the gate charge parameter rather than requiring separate hardware for each mode.
3Ease of operation
If autonomous state transitions are implemented based on current and temperature thresholds, then ease of operation is improved, but device complexity increases due to logic unit requirements
Solution Approach 1:
The patent implements self-service operation where the power switch system autonomously monitors its own state through the measuring device and automatically transitions between operating modes based on predefined current and temperature thresholds. The logic unit evaluates the determined charge levels and control signals, and autonomously activates the appropriate electronic switches without external intervention, making the system self-regulating and easy to operate while keeping the logic unit relatively simple through the use of clear threshold-based decision criteria.
Data Source
AI summary
A circuitry is suggested, in particular a power switch, comprising a first electronic switch with an isolated gate; a second electronic switch with an isolated gate; a measuring device for determining a charge at the isolated gate of the first electronic switch and at the isolated gate of the second electronic switch; an energy supply for providing charge to the isolated gate of the first electronic switch and to the isolated gate of the second electronic switch based on the charge determined by the measuring device; a logic unit for activating either the first electronic switch, both or none of the electronic switches.