Independent Timer Circuits for Power Supply Interruption
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Solution Overview
Problem
Conventional image forming apparatuses take a long time to interrupt power supply to high voltage units when the CPU is out of control, due to the complexity of shutdown sequences and the reliance on a single power supply OFF timer.
Innovation Solution
The implementation of multiple timer circuits that allow for individual power supply interruption to different units, enabling quick shutdown of high voltage units and controlled shutdown of control units, with adjustable timer settings for optimal timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power supply OFF timer is used to interrupt power supply after a predetermined period, then the shutdown sequence can be completed, but it takes a long time to interrupt power supply to high voltage units when the CPU is out of control
Solution Approach 1:
The power supply system is segmented into multiple independent timer circuits (first timer circuit and second timer circuit) that can operate independently. The first timer circuit controls power interruption to the high voltage unit, while the second timer circuit controls power interruption to the control unit. This segmentation allows each unit to have its power interrupted at the optimal time without being constrained by a single centralized timer, thereby reducing the overall power interruption time while maintaining reliability.
2Reliability
If the power supply OFF timer is set to accommodate the complete shutdown sequence of complicated systems, then all units can be shut down properly, but the time necessary for power interruption increases
Solution Approach 1:
The timer circuits are configured with different predetermined periods adapted to the specific shutdown requirements of each unit. The first timer circuit has a shorter period optimized for high voltage unit shutdown, while the second timer circuit has a longer period optimized for control unit shutdown. This dynamic configuration allows each timer to operate at its optimal speed, completing the shutdown sequence for each unit in the minimum necessary time rather than waiting for the longest shutdown sequence.
Data Source
AI summary
An information processing apparatus includes a first unit and a second unit supplied with power that can be interrupted individually, a power supply switch configured to be operated by a user, to turn off a power supply of the information processing apparatus, a controller configured to perform shutdown processing of the information processing apparatus thereby interrupting supply of power to the first unit and the second unit, upon turning off of the power supply switch, a first timer unit configured to interrupt the supply of the power to the first unit, after a lapse of a first predetermined time after turning off the power supply switch, and a second timer unit configured to interrupt the supply of power to the second unit, after a lapse of a second predetermined time after turning off the power supply switch. The second predetermined time is longer than the first predetermined time.