Thermal Shutdown Circuit with Temperature Warning Flags
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Solution Overview
Problem
Prior art thermal shutdown circuits abruptly cut off power when reaching a preselected temperature, causing inconvenience or damage in complex portable devices, and dedicated temperature sensors are costly and inadequate for managing localized temperature increases.
Innovation Solution
A thermal shutdown circuit that continuously senses temperature and issues multiple warning flags, allowing a host controller to adjust power levels and performance parameters, enabling intelligent thermal management without significant cost or power overhead, using a combination of current sources, diodes, and custom inverter circuits to provide distributed temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal shutdown circuit abruptly cuts off power when reaching a preselected temperature, then system damage due to heat and fire hazards are prevented, but inconvenience and potential damage occur in complex portable devices
Solution Approach 1:
The patent applies preliminary action by implementing multiple temperature warning flags (first, second, and third flags) that activate at progressively higher temperature thresholds before the final shutdown temperature is reached. This allows the host controller to initiate preventive measures such as reducing power consumption or activating cooling mechanisms before critical overheating occurs, thereby maintaining system operation continuity while still preventing damage.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature through the thermal shutdown circuit and providing real-time warning flag signals to the host controller. The controller can then adjust system operation based on this feedback, creating a closed-loop thermal management system that balances reliability and operational continuity.
2Reliability
If a dedicated temperature sensor integrated circuit is used to provide warning signals, then timely shutdown sequences can be initiated, but additional cost, area, and overhead are required
Solution Approach 1:
The patent merges the temperature sensing function with the existing thermal shutdown circuit by utilizing the same temperature sensing mechanism to generate multiple warning flags at different thresholds. This integration eliminates the need for a separate dedicated temperature sensor integrated circuit, thereby reducing additional cost, area, and overhead while maintaining timely shutdown capability.
Solution Approach 2:
The thermal shutdown circuit is designed to serve multiple functions: it provides both the final shutdown protection and generates intermediate warning flags that enable preventive thermal management. This multi-functionality allows a single circuit to replace what would traditionally require separate temperature sensing and shutdown control circuits.
3Temperature
If a centralized thermal management system is used, then global heating can be managed, but localized increases in temperature cannot be effectively managed
Solution Approach 1:
The patent applies segmentation by implementing multiple independent temperature warning flags that monitor different temperature thresholds independently. Each flag can be individually activated based on localized temperature conditions, allowing the system to respond to specific thermal events in different regions or circuits without requiring a centralized control approach.
4Reliability
If multiple temperature warning flags are implemented, then abrupt power shutdowns can be prevented and thermal management enhanced, but circuit complexity increases
Solution Approach 1:
The patent merges multiple temperature monitoring functions into a single integrated thermal shutdown circuit that generates multiple warning flags through internal threshold comparisons. This consolidation achieves enhanced thermal management capability without proportionally increasing circuit complexity, as the flags are generated within the existing shutdown circuit architecture rather than requiring separate monitoring circuits.
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
This solution prevents abrupt power shutdowns, enhances thermal management, and increases system reliability by allowing controlled adjustments in response to temperature changes, while maintaining low cost and power consumption.
Implementation Method 1
a first temperature warning flag is generated in response to detecting a first temperature
Data Source
AI summary
A system and method is disclosed that provides a thermal shutdown circuit that generates a plurality of temperature warning flag signals. Each temperature warning flag signal represents a different temperature. The thermal shutdown circuit comprises a plurality of inverter circuits in which each inverter circuit has a different temperature turn-on threshold. A temperature to binary code converter receives the temperature warning flag signals from the inverter circuits and generates a plurality of binary coded signals that represent a temperature that is detected by the thermal shutdown circuit. A host controller unit uses the temperature information from the binary coded signals to shut down subsystems in advance of an abrupt thermal shutdown of a system.