Load Voltage Control for Electronic Endoscope Tip
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Solution Overview
Problem
Conventional electronic endoscopes face challenges in maintaining accurate power supply voltage to image pickup devices due to varying cable lengths and specifications, leading to voltage drops and difficulties in adjusting power supply voltage based on the operating status of the device.
Innovation Solution
A load voltage control device with a power supply circuit and controller that uses multiple power supply lines to transmit power, allowing the controller to adjust the voltage applied to the load by monitoring input voltages and currents, ensuring a predetermined reference voltage is maintained regardless of cable length or specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power supply line is used to transmit power to the load, then the device complexity is reduced, but the voltage drop increases and power supply accuracy deteriorates
Solution Approach 1:
The power supply system is segmented into multiple parallel power supply lines (first power supply line and second power supply line) instead of using a single line. This segmentation allows the controller to measure voltage and current at multiple points, enabling accurate calculation of the voltage applied to the load through computational methods, thereby maintaining power supply accuracy while managing system complexity.
2Length of stationary object
If the cable length is increased to reach the load in the tip portion, then the coverage area is improved, but the voltage drop increases and power supply stability deteriorates
Solution Approach 1:
The system implements feedback control by measuring the voltage at the input point of the power supply line and the current flowing through it, then using these measurements to calculate the actual voltage applied to the load. The controller adjusts the power supply voltage based on this feedback to compensate for voltage drops in long cables, ensuring stable power supply to the load regardless of cable length.
3Measurement precision
If the power supply voltage is increased to compensate for voltage drop, then the power supply accuracy at the load is improved, but the energy loss in the cable increases
Solution Approach 1:
The system dynamically changes the power supply voltage parameter based on measured conditions. By measuring the input voltage and current, the controller calculates the actual load voltage and adjusts the power supply voltage to achieve the desired load voltage without excessive over-compensation, thereby minimizing energy loss while maintaining accuracy.
4Measurement precision
If a detection unit is disposed in the tip portion to implement feedback control, then the power supply accuracy is improved, but the tip portion size increases
Solution Approach 1:
The cable itself serves as an intermediary that carries both power supply signals and measurement information. By measuring voltage and current at the proximal end (power supply circuit side) and using these measurements to calculate load voltage, the system achieves feedback control without placing detection units in the tip portion, thus maintaining compact tip design while achieving accurate power supply control.
Data Source
AI summary
A load voltage control device, comprising: a load disposed in a tip portion; a power supply circuit and a controller disposed in a proximal end portion; and a cable connecting the tip portion with the proximal end portion, the cable comprising a first and second power supply lines, the power supply circuit comprising at least one power supply, wherein the controller operates to: obtain a voltage applied to the load based on a voltage applied to an input point of the first power supply line, a current flowing through the first power supply line, a voltage applied to an input point of the second power supply line and a current flowing through the second power supply line; and adjust the power supply voltage by controlling the at least one power supply so that the voltage applied to the load becomes substantially equal to a predetermined reference voltage.