Integrated Temperature-to-Voltage Circuit for Motor Drive Protection
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Solution Overview
Problem
Real-time temperature detection is lacking in motor drive systems, hindering timely temperature protection for motor components, which requires conversion of temperature changes into electrical signals for effective protection.
Innovation Solution
A circuit integrating a positive temperature change rate voltage generation module, a circuit bias module, and a temperature detection module on a single substrate, utilizing resistors, bipolar junction transistors, MOS transistors, and diodes to convert temperature changes into voltage changes, enabling real-time detection and optimization of motor drive systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature detection is not implemented in motor drive systems, then the system structure remains simple, but temperature protection cannot be applied timely and effectively for motor components
Solution Approach 1:
The patent integrates the temperature detection module, positive temperature coefficient voltage generation module, and circuit bias module into a single unified circuit system. The temperature detection module detects temperature changes and converts them to voltage signals, which are then processed by the PTC voltage generation module to produce a voltage signal with positive temperature coefficient. This merged structure enables comprehensive temperature protection functionality while maintaining compact integration, resolving the contradiction between reliability improvement and device complexity.
2Reliability
If temperature physical quantity is used directly for motor drive control, then temperature information is available, but the motor drive system cannot implement temperature protection as it requires electrical signal physical quantity
Solution Approach 1:
The patent introduces an intermediate conversion mechanism where the temperature detection module first converts temperature physical quantity to a voltage signal, and then the PTC voltage generation module further processes this voltage signal to create a control signal with positive temperature coefficient characteristics. This intermediary conversion process bridges the gap between temperature sensing and motor drive control requirements, enabling temperature protection implementation while managing the complexity through structured signal transformation.
3Loss of time
If real-time temperature detection is implemented, then temperature protection can be applied timely, but the circuit complexity increases with multiple modules
Solution Approach 1:
The patent combines the temperature detection module, PTC voltage generation module, and circuit bias module into an integrated circuit system where all modules work simultaneously in real-time. The temperature detection module continuously monitors temperature changes and immediately converts them to voltage signals, which are processed concurrently by the PTC voltage generation module. This merged real-time processing architecture achieves timely temperature protection response while managing circuit complexity through functional integration rather than sequential processing.
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 real-time temperature detection and conversion into voltage changes, optimizing motor drive system design by constructing an inflection point waveform that reflects temperature changes, thus enhancing temperature protection and system performance.
Implementation Method 1
the positive temperature change rate generation module is provided with a resistor R0 having a positive temperature property
Implementation Method 2
the circuit bias module includes bipolar junction transistors Q0 and Q1, metal-oxide semiconductor (MOS) transistors M0, M1, M2, M3 and M4
Implementation Method 3
the circuit bias module includes bipolar junction transistors Q0 and Q1, metal-oxide semiconductor (MOS) transistors M0, M1, M2, M3 and M4
Implementation Method 4
The temperature detection module is provided with a diode D0 that is able to convert the temperature change amount of the motor drive system into an electrical signal physical quantity
Data Source
AI summary
Disclosed is a circuit for converting a temperature change amount into a voltage change amount in a motor drive system, including a positive temperature change rate voltage generation module, a circuit bias module, and a temperature detection module that are integrated on a same substrate. An external power supply voltage is processed by the positive temperature change rate voltage generation module and the circuit bias module, and then inputted to the temperature detection module. The temperature detection module detects in real time the temperature change amount in the motor drive system, convert the temperature change amount into the voltage change amount, and transfer the voltage change amount to the circuit bias module, to allow the circuit bias module to output the voltage change amount. In this way, the conversion from the temperature change amount into the voltage change amount is realized.