Semiconductor Switching Loss Measurement via Segmented Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor switching devices lack an effective method to measure switching losses, which are crucial for controlling vehicle systems and operations in electrified vehicles, particularly in hybrid electric, plug-in hybrid electric, battery electric, and fuel cell vehicles.
Innovation Solution
A method and system that calculate switching loss information by operating a semiconductor switching device in conduction and switching cycles, measuring voltages and currents during charging and discharging steps, and deriving switching loss by subtracting conduction loss from combined conduction and switching loss, using a control unit and measurement devices to communicate this information for vehicle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If switching loss measurement is implemented in semiconductor switching devices, then vehicle system control precision is improved, but device complexity increases
Solution Approach 1:
The measurement system is segmented into distinct functional modules: a control unit that generates test signals and coordinates measurement timing, and separate measurement devices that independently measure voltage across and current through the semiconductor switching device. This segmentation allows each component to perform its specific function with high precision while keeping the overall system architecture manageable and modular.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the power supply, the semiconductor switching device under test, and the measurement devices. It generates the necessary test signals, controls the switching cycles, and synchronizes the voltage and current measurements, thereby enabling precise switching loss measurement without requiring direct complex interaction between all system components.
2Loss of energy
If conduction loss and switching loss are separately measured, then energy efficiency control is improved, but measurement time increases
Solution Approach 1:
The measurement method employs periodic switching cycles where the semiconductor switching device alternates between ON and OFF states under controlled test conditions. By performing multiple identical switching cycles with consistent timing, the system captures both conduction loss (during ON state) and switching loss (during transitions) in a repetitive, time-efficient manner. The periodic nature allows for statistical averaging and reliable separation of loss components without requiring excessively long measurement durations.
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 precise control of vehicle systems by providing accurate switching loss data, allowing for optimized thermal cooling and improved operational efficiency in electrified vehicles.
Implementation Method 1
charging an inductor with energy from a capacitor, performing a multitude of switching cycles, and discharging the energy from the inductor into the capacitor
Implementation Method 2
charging an inductor with energy from a capacitor, performing a multitude of switching cycles, and discharging the energy from the inductor into the capacitor
Data Source
AI summary
A method according to an exemplary aspect of the present disclosure includes, among other things, controlling a vehicle using switching loss information of a semiconductor switching device, the switching loss information derived from a conduction loss and a combined conduction and switching loss.