Printing Device Overvoltage Detection Circuit
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Solution Overview
Problem
Existing printing devices face challenges in accurately detecting the attachment state of printing material containers and preventing short circuits, which can lead to erroneous overvoltage detection and potential device failures.
Innovation Solution
The printing device incorporates a configuration with first and second detection terminals, a high voltage generator, and an overvoltage detector, along with a voltage drop element and current limiting resistor, to ensure accurate detection of attachment states and short circuits, and to prevent erroneous overvoltage detection by reliably dropping input voltages to the overvoltage detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high voltage generator is used to apply high voltage to detection terminals for overvoltage detection, then the ability to detect short circuits is improved, but the risk of erroneous overvoltage detection increases
Solution Approach 1:
A voltage drop element (resistor) is introduced as an intermediary component between the detection terminal and the overvoltage detector. This resistor drops the input voltage to a level suitable for the overvoltage detector, preventing erroneous detection of normal operating voltages as overvoltage conditions while still allowing true overvoltage events to be detected when the voltage exceeds the threshold even after the drop
Solution Approach 2:
The voltage level parameter is transformed by the voltage drop element to match the input requirements of the overvoltage detector. By changing the voltage parameter through resistive dropping, the system can accurately detect overvoltage conditions without being triggered by normal operating voltage levels
2Device complexity
If detection terminals are used to detect both attachment state and overvoltage, then the device complexity is reduced, but the difficulty of detecting and measuring increases
Solution Approach 1:
The voltage drop element is pre-configured in the circuit before detection occurs. This preliminary voltage transformation ensures that the overvoltage detector receives appropriately scaled signals, making it easier to distinguish between normal attachment signals and actual overvoltage conditions without requiring complex real-time signal processing
Solution Approach 2:
The voltage drop element acts as an intermediary that simplifies the detection process by pre-processing the voltage signals. This intermediary component reduces the complexity of signal differentiation by ensuring that all voltage inputs to the overvoltage detector are in the appropriate range for accurate measurement
Data Source
AI summary
A printing device, to which a printing material container having an electric device connected two first terminals and a wiring connecting two second terminals can be attached, includes: first and second detection terminals that contact the two first terminals; third and fourth detection terminals that contact the two second terminals; a first detection signal generator that outputs a first detection signal to the first detection terminal; a first detector that is connected to the second detection terminal; a second detection signal generator that outputs a second detection signal to the third detection terminal; a second detector that is connected to the fourth detection terminal; a high voltage generator that outputs high voltage to the first or the second detection terminal; an overvoltage detector; and a voltage drop element arranged between the overvoltage detector and the third or fourth detection terminal.