Power Source Separation Circuit Temperature Sensing via Optical Isolation
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Solution Overview
Problem
Existing temperature control systems for power source separation circuits require additional temperature sensors, leading to increased costs and reduced assembly reliability, and indirect temperature detection methods lack accuracy.
Innovation Solution
A temperature control apparatus using a comparator and insulating phototransistor to directly measure component temperatures and deliver protective or normal signals to a microcomputer, implemented in a circuit with a power source different from the microcomputer, leveraging a hysteresis characteristic for accurate temperature monitoring and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional temperature sensor is directly assembled to a component to be measured, then temperature measurement accuracy is improved, but costs increase and assembly complexity deteriorates
Solution Approach 1:
The temperature detection function is merged into the existing circuit components (comparator and insulating phototransistor) that are already part of the power source separation circuit. The comparator's hysteresis characteristic is utilized for temperature detection, eliminating the need for separate temperature sensors and reducing assembly complexity while maintaining measurement accuracy.
Solution Approach 2:
The comparator and insulating phototransistor circuit serves multiple functions: it provides both the original power source separation control function and the temperature detection function. This multi-functionality reduces the overall component count and assembly complexity while achieving accurate temperature measurement.
2Measurement precision
If an additional temperature sensor is directly assembled to a component to be measured, then temperature measurement accuracy is improved, but costs increase
Solution Approach 1:
The temperature detection capability is combined with existing circuit components (comparator and insulating phototransistor) rather than adding separate temperature sensors. This approach eliminates additional component costs while achieving accurate temperature measurement through the comparator's hysteresis characteristic.
Solution Approach 2:
The existing comparator circuit serves itself by utilizing its inherent hysteresis characteristic for temperature detection. The circuit components already present in the power source separation circuit are made to perform temperature detection without requiring additional specialized temperature sensing components, thereby reducing costs.
3Device complexity
If indirect temperature detection is performed through a common power supply, then assembly simplicity is maintained, but temperature measurement accuracy deteriorates
Solution Approach 1:
The temperature detection function is extracted from the common power supply circuit and implemented within the separate power source circuit for the component being monitored. This allows direct temperature detection at the component level while maintaining assembly simplicity, as the detection is performed by existing components in the local circuit rather than through indirect common power supply monitoring.
4Measurement precision
If a temperature detection circuit is implemented in a circuit that uses a power source different from the control microcomputer, then temperature measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The insulating phototransistor acts as an intermediary that transfers the temperature detection signal from the separate power source circuit to the control microcomputer. This allows accurate temperature measurement in the separate power source circuit while managing the complexity through optical isolation and signal transfer, enabling the microcomputer to receive accurate temperature data without direct electrical connection to the separate power source.
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
Enables direct and accurate temperature measurement of circuit components, reducing costs and assembly complexity while ensuring reliable protective and normal operations by using a separate power source for the temperature detection circuit.
Implementation Method 1
an insulating phototransistor configured to transmit an output signal of the comparator to the microcomputer
Implementation Method 2
leveraging a hysteresis characteristic for accurate temperature monitoring and control
Data Source
AI summary
The present disclosure is directed to an apparatus for controlling temperature of component of power source separation circuit in which a temperature detection circuit may be implemented in a circuit that uses a power source different from a power source used by the control microcomputer, may directly measure a temperature of a circuit component, and may deliver a protective signal to the control microcomputer using a comparator and an insulating phototransistor, thereby implementing a protective operation.