IC Feedback Control Circuit Power Down Protection
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Solution Overview
Problem
In electronic devices, improper power down of integrated circuits (ICs) can lead to detrimental effects due to the loss of control over feedback signals during power crashes, causing voltage stress on circuits.
Innovation Solution
An integrated circuit (IC) chip with a feedback control circuit and a detecting circuit that disengages from the feedback signal when a power down is detected, using a separate power supply to ensure safe regulation of the first power supply, and employing a passive circuit to maintain control over the feedback signal based on the first power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback control circuit is powered by the second power supply to regulate the first power supply, then the regulation control is improved, but during power down events the feedback signal loses control causing voltage stress on circuits
Solution Approach 1:
The patent divides the power supply system into two independent power supplies: a first power supply for digital circuitry and a second power supply for analog circuitry including the feedback control circuit. This segmentation ensures that when the second power supply undergoes power down, the first power supply and its associated circuits remain operational and can maintain control over the feedback signal, thereby preventing voltage stress while preserving regulation control.
Solution Approach 2:
The patent implements preliminary action by having the first feedback circuit prepared and ready to take over feedback signal control before the power down event completes. The detecting circuit monitors the second power supply status and triggers the first feedback circuit to engage proactively, ensuring continuous feedback control is maintained throughout the power down transition, thus preventing voltage stress on circuits.
2Stability of the object's composition
If a separate second power supply is used for the feedback control circuit, then the stability during operation is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the first feedback circuit to serve dual functions: it provides feedback control during normal operation and takes over as the primary feedback controller during power down events of the second power supply. This multi-functionality allows a single circuit to handle multiple operational states, reducing the need for additional dedicated circuits and thereby limiting the increase in device complexity while maintaining operational stability.
Solution Approach 2:
The detecting circuit acts as an intermediary that monitors the second power supply status and coordinates the switching between the second feedback circuit (during normal operation) and the first feedback circuit (during power down). This intermediary mechanism enables seamless transition and coordination between different power supply states without requiring complex control logic, thus maintaining stability while managing device complexity.
Data Source
AI summary
Aspects of the disclosure provide an integrated circuit (IC) chip that includes a feedback control circuit and a detecting circuit. The feedback control circuit is configured to govern a feedback signal to a first regulator that regulates a first power supply to the IC chip based on the feedback signal. The feedback control circuit is powered at least partially by a second power supply. The detecting circuit is configured to detect a power down of the second power supply, and to cause the feedback control circuit to be disengaged from the feedback signal in response to the power down.