Heat source device for heating
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Solution Overview
Problem
Heat source devices for heating face inappropriate operation states due to reversed polarity in voltage signals, leading to continuous heating stoppages and potential malfunctions, especially when connections are erroneous.
Innovation Solution
A heat source device with a voltage conversion circuit that detects the polarity of input voltage and converts it to a control voltage within specific ranges, preventing inappropriate operations by setting target output temperatures based on the polarity, and notifying users of incorrect connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage conversion circuit converts input voltage without polarity detection, then device complexity is reduced, but reliability deteriorates due to inappropriate operation when polarity is reversed
Solution Approach 1:
The voltage conversion circuit performs preliminary polarity detection of the input voltage before converting it to control voltage. This preliminary action allows the system to identify reversed polarity connections in advance and prevent inappropriate heating operations, thereby improving reliability without significantly increasing overall device complexity.
Solution Approach 2:
The voltage conversion circuit acts as an intermediary component between the input terminal and control circuit. It mediates the voltage signal by detecting polarity and converting appropriate voltage ranges to corresponding control voltage ranges, ensuring that the control circuit receives properly conditioned signals and preventing inappropriate heating operations.
2Reliability
If voltage conversion circuit uses separate voltage ranges for different polarities, then reliability is improved by preventing inappropriate operations, but device complexity increases
Solution Approach 1:
The voltage conversion circuit changes its conversion parameters based on the detected input voltage polarity. When positive polarity is detected, it converts voltage from a first range to a first control voltage range; when negative polarity is detected, it converts voltage from a second range to a second control voltage range. This parameter-based approach enables reliable polarity-specific control without requiring physically different circuit configurations.
3Productivity
If control circuit sets target output based on control voltage from voltage conversion circuit, then heating performance is improved, but loss of information occurs when polarity is reversed and control voltage becomes invalid
Solution Approach 1:
The voltage conversion circuit incorporates feedback mechanisms to monitor the input voltage polarity and adjust its conversion behavior accordingly. This feedback ensures that the control voltage provided to the control circuit always corresponds to valid heating control ranges, preventing loss of information that would occur with reversed polarity connections and ensuring consistent heating performance.
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
Ensures safe and appropriate operation by preventing prolonged inappropriate states and allowing users to correct polarity errors, ensuring consistent heating performance regardless of signal polarity.
Implementation Method 1
a voltage conversion circuit which converts an input voltage generated at an input terminal into a control voltage input to the control circuit
Data Source
AI summary
When a voltage signal is input to input terminals as a positive voltage, the voltage conversion circuit generates a control voltage proportional to an input voltage by a voltage-dividing circuit according to resistance elements, a voltage follower circuit according to an operational amplifier, and a voltage-dividing circuit according to resistance elements. When a voltage signal is input to the input terminals as a negative voltage, since the operational amplifier outputs a power supply voltage according to an input of the negative voltage, the voltage conversion circuit generates a predetermined positive voltage obtained by dividing the power supply voltage by the resistance elements as the control voltage. The predetermined positive voltage is higher than a voltage range of the control voltage when the voltage signal is input as the positive voltage.