Boost Circuit Abnormality Detection and Recovery
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Solution Overview
Problem
Display drivers for automobile applications face challenges in recovering from power supply malfunctions due to noise and data corruption, which prevent the boost operation of boost circuits from returning to a normal state, especially since the power cannot be turned off like in portable devices.
Innovation Solution
A circuit device with a power supply circuit and an abnormality detection circuit that detects anomalies in boosted voltages and switches to a low-capacity boost operation or stops the boost operation in other circuits, allowing self-recovery and resumption of normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply circuit operates continuously in automobile applications, then the display driver can function without interruption, but the system cannot recover from power supply malfunctions caused by noise and data corruption
Solution Approach 1:
The abnormality detection circuit continuously monitors the boosted voltage before malfunctions propagate through the system. By detecting abnormalities in advance (such as voltage deviations caused by parasitic bipolar conduction), the system can trigger protective actions (stopping the boost operation) before the malfunction becomes irreversible, enabling recovery without power cycling.
Solution Approach 2:
The abnormality detection circuit provides real-time feedback on the state of the boosted voltage to the control logic. This feedback mechanism allows the system to automatically adjust the boost operation based on detected conditions, stopping the operation when abnormalities are detected and resuming when normal conditions return, thus achieving self-recovery.
2Power
If the boost operation continues at full capacity, then the power supply can meet the demand of the circuit, but noise and data corruption can cause large currents that prevent recovery from malfunction
Solution Approach 1:
The boost operation dynamically adjusts its capacity based on real-time voltage conditions. The control logic switches between full-capacity operation (when normal) and stopped operation (when abnormality detected), allowing the system to maintain high power output when needed while preventing runaway current conditions that would block recovery.
3Measurement precision
If an abnormality is detected in the i-th boosted voltage, then the power supply malfunction can be identified, but the i-th boost circuit itself cannot stop the abnormal current flow
Solution Approach 1:
The control logic acts as an intermediary between the abnormality detection circuit and the boost circuits. When the detection circuit identifies an abnormality in the i-th boosted voltage, the control logic receives this information and issues stop commands to the boost operation, thereby indirectly controlling the current flow that the detection circuit cannot directly control.
Data Source
AI summary
A driver includes a power supply circuit having first to n-th boost circuits, a circuit that operates based on power supplied from the power supply circuit, and an abnormality detection circuit. The abnormality detection circuit detects an abnormality of an i-th boosted voltage that is generated based on a boost operation of an i-th boost circuit. If an abnormality of the i-th boosted voltage is detected, a j-th boost circuit performs a low-capacity boost operation with a lower current-supply capacity than an ordinary boost operation or stops the boost operation.