Printing Apparatus Dual Detection Circuit Short-Circuit Isolation
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Solution Overview
Problem
Existing printing apparatuses face challenges in accurately detecting short circuits between terminals, which can lead to failures, due to the complexity of circuit configurations and the need for high-accuracy determination circuits, especially when handling varying voltage levels and the potential for energy loss.
Innovation Solution
The printing apparatus employs a dual detection signal system where both first and second detection signals are used for attachment and short-circuit detection, eliminating the need for an electric-current detection resistor and analog circuits, and utilizing impedance differences to prioritize short-circuit detection signals over contact detection signals, with an overvoltage detection unit and electric-current limitation resistor for adjustable detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a relatively low resistance electric-current detection resistor is used to suppress energy loss, then energy loss is reduced, but the detected voltage level from current-to-voltage conversion is lowered, requiring higher accuracy determination circuit
Solution Approach 1:
The patent replaces the analog voltage-level measurement method with a digital comparison method. Instead of measuring voltage levels continuously and requiring high-precision analog circuits, the system uses a determination circuit that compares detected voltage levels against predetermined reference levels to determine short circuit conditions. This digital approach reduces the precision requirements of the determination circuit while maintaining detection accuracy.
2Measurement precision
If analog circuit is used for determination circuit to achieve higher accuracy, then measurement precision is improved, but device complexity is increased due to additional level conversion circuit
Solution Approach 1:
The patent replaces complex analog level conversion circuits with a simplified digital comparison approach. The determination circuit directly compares detected voltage levels against predetermined reference levels using digital logic, eliminating the need for additional analog level conversion stages. This reduces circuit complexity while maintaining or improving determination accuracy.
Solution Approach 2:
The patent changes the operating parameter from continuous analog voltage measurement to discrete digital level comparison. By using predetermined reference levels and digital comparison logic, the system transforms the continuous measurement problem into a discrete decision-making process, simplifying the circuit configuration while maintaining detection accuracy.
3Reliability
If protection circuit operates after short circuit is determined, then response time is delayed, but short-circuit electric current flows for longer duration causing greater damage
Solution Approach 1:
The patent implements preliminary detection and determination of short circuit conditions before full damage can occur. The detection circuit continuously monitors voltage levels and the determination circuit is configured to identify short circuit conditions at early stages. This preliminary detection enables the control unit to take protective action before the short circuit current can cause extensive damage, effectively reducing the harmful duration.
4Adaptability or versatility
If voltage levels of terminals fluctuate during operation, then adaptability is improved for handling varying conditions, but measurement precision deteriorates due to further variation in accuracy
Solution Approach 1:
The patent employs feedback mechanisms where the determination circuit continuously compares detected voltage levels against reference levels and adjusts its determination accordingly. This feedback approach allows the system to adapt to voltage fluctuations while maintaining measurement accuracy through continuous monitoring and comparison, ensuring reliable short circuit detection despite varying operating conditions.
Data Source
AI summary
A printing apparatus includes a first detection terminal and a second detection terminal which contact with respective two first terminals of each of printing material containers; a third detection terminal and a fourth detection terminal which contact with respective two second terminals of each of the printing material containers; a first detection unit detects a first detection signal from the first detection terminal via a first attachment detection path; and a second detection unit detects a second detection signal from the third detection terminal via a second attachment detection path. The first detection unit detects a short circuit occurring between the second detection terminal and the third detection terminal on the basis of the second detection signal, and the second detection unit detects a short circuit occurring between the first detection terminal and the fourth detection terminal on the basis of the first detection signal.