Bus Bar Transient Temperature Estimation From Electrical Signals
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Solution Overview
Problem
Existing thermal management systems struggle to accurately measure transient temperatures of circuit buses in real time, leading to inefficiencies and potential failures under varying operating conditions.
Innovation Solution
A power supply device equipped with a bus, temperature sensor, circuit measuring device, and computing circuit that measures voltage, current, and AC frequency to calculate transient temperatures by obtaining resistance values and adding initial and rising temperature values, enabling real-time transient temperature estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature measuring device is used to measure steady-state temperature, then the overall operating ambient temperature can be obtained, but the transient temperature at a specific moment cannot be detected
Solution Approach 1:
The patent replaces the physical temperature sensor measurement system with an electrical calculation system. By measuring voltage, current, and frequency on the bus and calculating temperature through a computing circuit based on electrical parameters and thermal models, the system achieves transient temperature detection without the response time limitations of physical sensors.
Solution Approach 2:
The patent introduces electrical parameters (voltage, current, frequency) as intermediary measurements to indirectly determine temperature. Instead of directly measuring temperature with a slow-responding sensor, the system measures electrical parameters that change rapidly and calculates temperature from these intermediaries, enabling real-time transient temperature detection.
2Productivity
If basic thermal models with manual calibration are used, then the system structure remains simple, but efficiency decreases and failures may occur under varying operating conditions
Solution Approach 1:
The patent transforms the static, manually calibrated thermal model into a dynamic system that automatically adapts to varying operating conditions. The computing circuit continuously calculates temperature based on real-time electrical parameters (voltage, current, frequency), enabling the system to respond dynamically to changing conditions without manual intervention or complex recalibration.
Solution Approach 2:
The system performs self-calibration and self-monitoring through automatic temperature calculation based on electrical parameters. The computing circuit continuously updates temperature estimates using real-time voltage, current, and frequency measurements, eliminating the need for manual calibration and enabling adaptive thermal management without increasing operational complexity.
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 calculation of transient temperatures, allowing for timely over-temperature protection and efficient operation by adjusting power supply parameters, thereby preventing damage and extending the service life of the power supply system.
Implementation Method 1
The temperature sensor is configured to measure an initial temperature in an initial phase
Implementation Method 2
obtain a first transient power of the bus based on the current on the bus and the resistance value signal
Implementation Method 3
obtain a resistance value signal based on the AC frequency
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A power supply apparatus (100), comprising a bus bar (BUS1), a circuit measurer (120), a temperature sensor (130) and an operation circuit (140). The bus bar (BUS1) is coupled to an inverter (110) and a motor (MOT1). The temperature sensor (130) is configured to measure an initial temperature in an initial state. The circuit measurer (120) is configured to measure a voltage (V1), a current (I1) and an alternating current frequency (F1) on the bus bar (BUS1). The operation circuit (140) is coupled to the circuit measurer (120) and the temperature sensor (130). The operation circuit (140) is configured to solve a resistance value signal (R1) on the basis of the alternating current frequency (F1), solve a first transient power of the bus bar (BUS 1) on the basis of the current (I1) and the resistance value signal (R1) on the bus bar (BUS1), solve a first temperature rise value of the bus bar (BUS1) on the basis of the first transient power; and add the initial temperature to the first temperature rise value so as to obtain a first transient ideal temperature of the bus bar (BUS 1). The present invention further relates to a temperature measurement method (400) for the bus bar (BUS1).