Series Sensor Isolation Circuit for Image Forming Reliability
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Solution Overview
Problem
In image forming apparatuses with multiple sensors connected in series, a failure in one sensor can disrupt the operation of all downstream sensors, leading to increased complexity and cost due to the need for numerous cables and connectors.
Innovation Solution
A sensor control apparatus with a controller, switches, and a diagnosis unit that isolates a failed sensor from the series connection, preventing the failure from affecting other sensors, and simplifies the connection structure by using a common ground and different power supply lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple sensors are connected in series to reduce the number of cables and connectors, then the wiring space and connector count decrease, but a failure in one sensor causes cascading failures in downstream sensors
Solution Approach 1:
The patent divides the series-connected sensor network into independent segments by introducing isolation switches between adjacent sensors. Each sensor becomes an isolated unit that can operate independently, preventing failure propagation while maintaining the reduced wiring structure. The isolation switches act as segmentation boundaries that partition the system into fault-isolated zones.
Solution Approach 2:
The patent introduces isolation switches as intermediary components between adjacent sensors in the series connection. These switches mediate the electrical connection, allowing normal operation while providing a mechanism to disconnect faulty sensors. The intermediary switches enable controlled isolation without requiring complete rewiring of the sensor network.
Data Source
AI summary
Provided is a sensor control apparatus including a main board, a first sensor, a second sensor, and a third sensor, which are connected in series to the main board. The first sensor includes a diagnosis unit configured to perform a failure diagnosis of each of an LED, a phototransistor, and an LED controller. In a case where a failure is detected, the diagnosis unit electrically isolates the first sensor from the series connection, and supplies a power supply voltage to the second sensor.