Peak current estimation based on output capacitor parameters and output voltage variation

By sensing the inductor current and output voltage, combined with the parameters of the output capacitor, the peak current of the load current is estimated, and the problem of large delay when the load current is too large in the prior art is solved, and the OC warning signal is issued in a timely manner, which improves the safety of the load and the power efficiency of the voltage regulator.

CN112003452BActive Publication Date: 2025-03-28INFINEON TECH AUSTRIA AG
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Patent Information

Application Number
CN202010383401.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-05-09
Filing Date
2020-05-08
Publication Date
2025-03-28
Estimated Expiration
2040-05-08

AI Technical Summary

Technical Problem

The prior art has a large delay when detecting that the load current is too large, resulting in the inability to issue an overcurrent (OC) warning signal in time, which may cause the load to shut down due to excessive current.

Method used

By sensing the inductor current and output voltage, the voltage change in the output voltage is determined, and the peak current of the load current is estimated based on the inductor current, voltage change, and the capacitance or equivalent series resistance (ESR) of the output capacitor, thereby issuing an OC warning signal in time.

Benefits of technology

The delay when the load is detected at the voltage regulator is reduced, and the OC warning signal is issued is improved, thereby reducing the risk of the load being shut down due to excessive current, and without affecting the power efficiency of the voltage regulator.

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Abstract

The controller of the switching voltage regulator estimates the load current based on the current within the voltage regulator, the change in the output voltage of the voltage regulator, and the capacitance and / or equivalent series resistance (ESR) of the output capacitor. For sharp drops in the output voltage, the ESR of the output capacitor provides a better estimate of the load current, while the output capacitance provides a better estimate for moderate output voltage drops. These techniques enable the voltage regulator controller to detect excessive load current more quickly and issue an overcurrent warning to the load with little time delay. The fast response provided by these techniques provides the load (e.g., a CPU or GPU) with sufficient time to reduce its current, thereby avoiding a complete shutdown due to excessive load current.
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