In-Vehicle Power Supply Switching Element State Detection
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Solution Overview
Problem
Conventional in-vehicle power supply devices face challenges in accurately determining the operational state of switching elements, which can lead to potential damage to boost converters and inadequate power supply to loads, especially when the switching element fails to function properly.
Innovation Solution
The proposed solution involves a power supply device with a boost converter, a connection-assist diode, and a switching element, where a controller instructs the switching element to open and close, and determines its state based on voltage differences at the output terminal, ensuring stable operation and preventing damage to the boost converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching element is monitored continuously to detect its state, then the reliability of power supply is improved, but the device complexity increases due to additional monitoring circuits and control logic
Solution Approach 1:
The switching element's own on/off state is utilized to control the boost converter operation. When the switching element is on, the boost converter operates normally; when it is off, the boost converter automatically switches to a different mode, eliminating the need for external monitoring circuits to detect the switching element state
Solution Approach 2:
The boost converter serves multiple functions: it performs voltage boosting when the switching element is on, and automatically provides protection and alternative power supply when the switching element is off, without requiring separate monitoring or control circuits
2Stability of the object's composition
If the boost converter operates continuously to maintain power supply, then the power supply stability is improved, but the risk of damage increases when the switching element fails
Solution Approach 1:
The system proactively prevents damage to the boost converter by using the switching element's state to control boost converter operation. When the switching element is detected to be off, the boost converter automatically switches to a protection mode that prevents excessive current and voltage stress, eliminating the need for separate protection circuits
Solution Approach 2:
The control unit acts as an intermediary that receives the switching element state and automatically adjusts the boost converter operation accordingly, providing a smooth transition between normal operation and protection modes without requiring additional sensing circuits
3Speed
If the voltage monitoring is performed frequently to detect switching element state, then the response speed is improved, but the energy consumption increases
Solution Approach 1:
The system performs voltage monitoring at specific periodic intervals corresponding to the switching element's expected state changes, rather than continuously monitoring. The control unit checks the voltage at predetermined timing points in the operating cycle, reducing overall energy consumption while maintaining timely detection of state changes
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
This configuration allows for accurate determination of the switching element's operational state, ensuring stable power supply to loads and preventing boost converter damage by detecting voltage changes, thereby enhancing the reliability of the in-vehicle power supply system.
Implementation Method 1
boost converter configured to perform a boost-up operation to boost a voltage supplied from an input terminal
Implementation Method 2
connection-assist diode connected in parallel to the boost convertor between the input terminal and an output terminal
Implementation Method 3
controller determines a state of the switching element based on a voltage at the output terminal detected
Data Source
AI summary
A power supply device includes a boost convertor configured to perform a boost-up operation to boost a voltage supplied from an input terminal, a connection-assist diode connected in parallel to the boost convertor between the input terminal and an output terminal, and a switching element connected in parallel to the boost convertor and the connection-assist diode between the input terminal and the output terminal. A controller instructs the switching element to open and instructs the boost convertor to perform a boost-up operation for boosting the voltage at the input terminal during a boost-up period. The controller instructs the boost convertor to stop the boost-up operation when the boost-up period elapses. The controller then instructs the switching element to close the switching element. The controller then determines a state of the switching element based on a voltage at the output terminal detected. The in-vehicle power supply device can stably and accurately determine whether the switching element operates normally or not.