Image Processing Control Device with Reset Power Isolation
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Solution Overview
Problem
Existing control devices for image processing apparatuses face malfunctions due to high impedance at the input terminal during reset operations, leading to incorrect output of control signals and device malfunctions.
Innovation Solution
The control device includes a signal generating portion, a signal output portion, and a power supply control portion, where the power supply control portion separately controls the second power supply to stop power to the signal output portion during reset operations, ensuring stable output of control signals by maintaining the signal output portion in an inactive state until the reset is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal output portion is driven by a separate second power supply, then the reliability is improved by preventing overcurrent during power supply voltage fluctuations, but the device complexity increases due to the need for separate power supply control
Solution Approach 1:
The power supply system is segmented into a first power supply for the signal generating portion and a second power supply for the signal output portion. This segmentation allows independent control of each power supply, enabling the second power supply to be stopped during reset operations to prevent overcurrent while maintaining the first power supply for stable signal generation.
Solution Approach 2:
The system performs preliminary action by stopping the second power supply before the reset operation completes and the input terminal transitions from high impedance to active state. This preliminary power supply control prevents incorrect control signal output that would occur if the signal output portion remained active during the reset transition.
2Reliability
If power supply is stopped to the signal output portion during reset operations, then the reliability is improved by preventing incorrect control signal output, but the productivity decreases due to the additional power supply control overhead
Solution Approach 1:
The power supply control portion stops the second power supply in advance before the reset operation completes, preventing the input terminal from being in a high impedance state while the signal output portion is active. This preliminary power cutoff ensures correct control signal output without requiring complex real-time monitoring during the reset transition.
Solution Approach 2:
The power supply control portion acts as an intermediary between the reset signal and the second power supply, mediating the power supply state based on the reset operation status. This intermediary control ensures that the second power supply is stopped during reset operations and restarted afterward, maintaining system reliability while managing the complexity of power supply coordination.
Data Source
AI summary
A control device includes a signal generating portion, a signal output portion, and a power supply control portion. The signal generating portion is configured to output a first signal from an output terminal. The signal output portion includes an input terminal configured to receive the first signal. The signal output portion is configured to output a control signal corresponding to the first signal. The power supply control portion is configured to control a second power supply provided separately from a first power supply and stop power supply from the second power supply to the signal output portion in accordance with a second signal from outside. The first power supply is configured to drive the signal generating portion. The second power supply is configured to drive the signal output portion.