Heater Resistor Bridge Control for Precise Tissue Heating
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Solution Overview
Problem
Conventional treatment systems for living tissues using heater resistors face challenges in accurately controlling temperature due to line resistance and contact resistance, leading to inefficiencies in thermal energy application.
Innovation Solution
A treatment system incorporating a double bridge circuit with a detection resistor, a power supply voltage generator, and a controller that modulates the power supply voltage based on detected AC and DC components to accurately set and maintain the resistance value of the heater resistor, ensuring precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional fall-of-potential method is used to calculate resistance value, then the measurement can be performed, but line resistance and contact resistance affect measurement precision
Solution Approach 1:
The patent introduces a detection resistor as an intermediary element in the measurement circuit. By placing the detection resistor in series with the heater resistor and measuring the voltage across the detection resistor, the system can calculate the current flowing through the heater resistor without being affected by line resistance and contact resistance. This intermediary measurement point isolates the harmful resistances from the measurement process.
Solution Approach 2:
The patent replaces the conventional direct voltage measurement method with an indirect measurement approach using a detection resistor. Instead of directly measuring the voltage drop across the heater resistor (which would be affected by line and contact resistances), the system measures the voltage across the detection resistor and uses Ohm's law to calculate the current, thereby substituting a more accurate measurement mechanism.
2Manufacturing precision
If the heater resistor temperature is controlled accurately, then treatment precision is improved, but the circuit configuration becomes complex due to multiple resistance components
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the voltage across the detection resistor, calculates the current through the heater resistor, determines the heater resistor's resistance value, and adjusts the power supply voltage accordingly. This closed-loop feedback system maintains accurate temperature control despite the presence of multiple resistance components in the circuit.
Solution Approach 2:
The patent dynamically adjusts the power supply voltage parameter based on the calculated resistance value of the heater resistor. By changing the voltage parameter in response to resistance variations (which correlate with temperature changes), the system achieves precise temperature control while managing the complexity of multiple circuit components through adaptive parameter adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high-accuracy temperature control of the heater resistor, reducing the impact of line and contact resistances, and simplifies the circuit configuration by utilizing the DC component for feedback control, thereby enhancing the efficiency of thermal energy application to living tissues.
Implementation Method 1
a heater resistor provided on one jaw of the pair of jaws, the heater resistor being configured to generate heat by energization
Implementation Method 2
the control device measures a potential difference between both ends of the detection resistor and a current flowing through the detection resistor. The control device subsequently calculates a resistance value of the heater resistor on the basis of the measured potential difference and the current
Data Source
AI summary
A treatment system that includes a pair of jaws and a heater resistor provided on one jaw of the pair of jaws that generates heat by energization. The system also includes a heating device that controls a current to set a resistance value of the heater resistor to a target resistance value. The heating device includes a double bridge circuit allowing current to flow between the heating device and the heater resister when detecting, by the detection resister, a difference between the resistance value of the heater resistor and the predetermined target resistance value. The heating device including a power supply voltage generator that generates a power supply voltage to be applied to the heater resistor and the double bridge circuit, a controller that modulates the generated power supply voltage, and a heater resistance detector that detects an AC component from the current flowing through the detection resistor.