Dynamic Overcurrent Protection Adjustment for Transient Load Currents
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Solution Overview
Problem
Existing power delivery networks and voltage regulators face challenges in providing reliable over current protection, particularly during transient changes in load current, which can lead to false trips and alarms due to high di/dt events, and require adjustments in over current protection parameters without dedicated current measuring devices.
Innovation Solution
A method and system that monitor load current amplitude and rate of change, adjusting over current protection values from a first to an adjusted value for a predefined time when the rate of change exceeds a threshold, and reversing the adjustment at the expiration of this time, ensuring proper operation and reducing false trips by dynamically varying over current protection parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If over current protection values are increased to prevent false trips during transients, then false alarm rate is reduced, but protection sensitivity decreases during normal operation
Solution Approach 1:
The patent uses periodic action by temporarily adjusting the protection value only during the period when high di/dt is detected, for a predefined time duration. This temporary adjustment reduces false alarms during transients while allowing the system to return to normal sensitivity after the transient event passes, thus maintaining both low false alarm rate and high protection sensitivity at different times.
Solution Approach 2:
The protection system dynamically adjusts its sensitivity based on real-time di/dt measurements. The protection value increases temporarily during transient events to reduce false alarms, then returns to the original value to restore protection sensitivity, creating a dynamic balance between false alarm reduction and sensitivity maintenance.
2Measurement precision
If dedicated current measuring devices are used to monitor load current, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using the existing current monitoring capability of the protection circuit for dual purposes: both for over current protection and for detecting the rate of change of load current (di/dt). This eliminates the need for separate dedicated current measuring devices, reducing system complexity while maintaining the precision needed for dynamic protection value adjustment.
Solution Approach 2:
The protection circuit's current monitoring function is utilized multi-functionally to detect both absolute current levels and the rate of change of current. This multi-functionality allows the system to achieve precise di/dt measurement without adding dedicated measuring devices, thereby reducing overall system complexity.
Data Source
AI summary
The systems and methods described are for adjusting over current protection values during changes in load current. In one aspect, a method includes, monitoring a load current amplitude value at a power input connected to an electrical load; determining a rate of change of the load current amplitude value; determining whether the rate of change of the load current amplitude value exceeds a predefined rate threshold value; in response to determining that the rate of change of the load current amplitude value exceeds the predefined rate threshold value: adjusting an over current protection value from a first over current protection value to an adjusted over current protection value for a first predefined amount of time; and at the expiration of the first predefined amount of time, at least partially reversing the adjustment to the over current protection value.