Thermal Management via Power Consumption Estimation
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Solution Overview
Problem
Conventional thermal sensing techniques in driver circuits are slow and sensitive to substrate noise and thermal conductivity, making them inadequate for managing thermal states in high-power load systems, particularly during short-circuit events where rapid response is necessary.
Innovation Solution
A thermal management method that estimates power consumption based on voltage drops across terminals, using a power consumption estimator to generate a fault signal and adjust operational parameters, thereby serving as a proxy for thermal state measurement, independent of thermal conductivity and substrate noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional thermal sensing techniques are used, then thermal state measurement is achieved, but the response speed is slow and sensitivity to substrate noise and thermal conductivity is high
Solution Approach 1:
The patent introduces an intermediary approach by using power consumption estimation as a mediator to infer thermal state. Instead of directly measuring temperature with slow thermal sensors, the system estimates power consumption based on voltage drops and uses this as a proxy for thermal state, achieving faster response while maintaining measurement effectiveness
Solution Approach 2:
The patent replaces the mechanical/physical thermal sensing system with an electrical measurement system. By substituting direct thermal measurement with electrical voltage drop measurements and power consumption calculations, the system achieves faster response speed while eliminating sensitivity to substrate noise and thermal conductivity variations
2Speed
If power consumption estimation is used as a proxy for thermal state measurement, then response speed is improved and sensitivity to substrate noise is reduced, but measurement precision may be affected
Solution Approach 1:
The patent implements feedback by continuously monitoring voltage drops, estimating power consumption, and using this information to adjust operational parameters. The system compares estimated power consumption against thresholds and provides feedback control to manage thermal states, ensuring measurement precision is maintained through active regulation
Solution Approach 2:
The patent changes the measurement parameter from direct temperature sensing to power consumption estimation based on voltage drops. By transforming the measurement approach and using power consumption as a proxy parameter, the system achieves faster response while maintaining adequate measurement precision for thermal management decisions
3Power
If driver circuits operate at high power levels, then performance is improved, but thermal damage risk increases
Solution Approach 1:
The patent applies preliminary action by estimating power consumption before thermal damage occurs and taking preventive measures. The system continuously monitors power consumption estimates and takes corrective action when thresholds are approached, preventing thermal damage before it happens rather than reacting after damage occurs
Solution Approach 2:
The patent uses feedback control to balance power output and thermal safety. By continuously monitoring power consumption estimates and comparing against safety thresholds, the system provides feedback to adjust operational parameters, enabling high power operation while maintaining reliability through active thermal management
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
Enables real-time, rapid thermal state monitoring and management of driver circuits, preventing damage during overloads by scaling power dissipation and extending operational duration before triggering alarms or shutdowns, with reduced sensitivity to substrate noise and improved accuracy.
Implementation Method 1
generating a power consumption estimate for the circuit based on a predetermined update amount and a comparison of a sensed voltage level to a predetermined voltage level... sensing a voltage drop across a first terminal of a device of the circuit and a second terminal of the device to generate the sensed voltage level
Data Source
AI summary
A technique for thermal management of a circuit includes generating a power consumption estimate for the circuit based on a predetermined update amount and a comparison of a sensed voltage level to a predetermined voltage level. The method includes generating a fault signal based on the power consumption estimate and a predetermined power consumption limit. Generating the power consumption estimate may include sensing a voltage drop across a first terminal of a device of the circuit and a second terminal of the device to generate the sensed voltage level. The sensed voltage level may be indicative of the voltage drop. The method may include updating the power consumption estimate by the predetermined update amount in response to a clock signal. The power consumption estimate may be used as a proxy for a measurement of a thermal state of the circuit.