Dynamic Current Limiting for Power Converter Thermal Control
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Solution Overview
Problem
Power distribution in consumer electronics is challenging due to increasing power consumption, leading to frequent faults and unpredictable behavior, as devices struggle with physical size, thermal, and battery capacity constraints, which can result in degradation and loss of data.
Innovation Solution
A power converter with a logic component that dynamically adjusts the threshold current and throttles output to maintain a predetermined average current output, using timers and integrator circuits to enforce current limits, thereby mitigating electromigration and thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a larger power supply is included to meet increasing power consumption demands, then power delivery capability is improved, but device physical size increases
Solution Approach 1:
The patent implements dynamic current limiting that adjusts the current threshold based on integrated current output signals. The logic component continuously monitors and adjusts the current limit, allowing the power converter to deliver high peak power when needed while maintaining safe average power levels, thereby providing dynamic power delivery without requiring oversized power supply components.
2Power
If a larger power supply is included to meet increasing power consumption demands, then power delivery capability is improved, but thermal operating envelope constraints are exceeded
Solution Approach 1:
The patent employs periodic current throttling through integrated current monitoring. When the integrated current output signal exceeds a threshold, the logic component reduces the current limit, creating a periodic on-off pattern that delivers power in controlled bursts. This allows high peak power delivery while maintaining acceptable average power levels and thermal conditions.
3Use of energy by moving object
If battery capacity is increased to meet power demands, then power availability is improved, but device physical size increases
Solution Approach 1:
The patent changes the operational parameters of the power converter by dynamically adjusting the current limit based on integrated current feedback. This allows the system to extract more power from the same battery capacity by optimizing the discharge profile, delivering higher peak currents when needed while maintaining safe average current levels, thereby improving power availability without increasing battery size.
4Power
If current output is increased to meet power demands, then power delivery is improved, but electromigration and thermal damage occur
Solution Approach 1:
The patent implements a feedback mechanism where the logic component monitors the integrated current output signal and adjusts the current limit accordingly. This closed-loop control ensures that the average current remains within safe limits, preventing electromigration and thermal damage, while still allowing high peak currents to be delivered when the integrated signal is below the threshold.
Data Source
AI summary
This application relates to a power converter for a computing device. The power converter can maintain an average output current while also allowing the output current to reach a peak current limit for periods of time. The average output current is maintained by enforcing a dynamic current limit on the output current. The dynamic current limit can change over time depending on whether the average output current is above or below an average current threshold. The changes to the dynamic current limit can occur at a rate defined by one or more time constants in order to reduce electromigration and maintain a temperature of the power converter below a predetermined temperature threshold.