Boosted Power Supply Circuit for Steering Sensor Voltage Hold-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional load driving devices fail to maintain operation of target circuits, such as rotation angle sensors and three-phase pre-drivers, when battery voltage temporarily drops, leading to disruptions in electric power steering systems.
Innovation Solution
Incorporating a power converter, a booster circuit, and a post-boost capacitor, or a power converter capacitor, to ensure a stable voltage supply to the target circuits via a specific regulator, even during voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power converter is used without additional voltage stabilization components, then the device complexity is reduced, but the reliability of target circuit operation during battery voltage drops deteriorates
Solution Approach 1:
The booster circuit proactively boosts the battery voltage before it reaches the power converter, and the capacitor stores energy in advance. This preliminary action ensures that when voltage drops occur, the target circuit already has sufficient voltage headroom to maintain operation without interruption.
Solution Approach 2:
The capacitor acts as an intermediary energy storage element between the power converter and the target circuit. It absorbs voltage fluctuations and provides supplemental energy during voltage drops, mediating the connection between the unstable power source and the sensitive target circuit to ensure continuous operation.
2Reliability
If a booster circuit and capacitor are added to stabilize voltage, then the reliability of target circuit operation improves, but the device complexity increases
Solution Approach 1:
The booster circuit proactively boosts the battery voltage before it reaches the power converter, and the capacitor stores energy in advance. This preliminary action ensures that when voltage drops occur, the target circuit already has sufficient voltage headroom to maintain operation without interruption.
Solution Approach 2:
The capacitor acts as an intermediary energy storage element between the power converter and the target circuit. It absorbs voltage fluctuations and provides supplemental energy during voltage drops, mediating the connection between the unstable power source and the sensitive target circuit to ensure continuous operation.
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 continuous operation of target circuits during battery voltage drops, maintaining accurate steering angle calculations and preventing temporary stoppages in electric power steering systems.
Implementation Method 1
The booster circuit boosts a battery voltage supplied via the power supply line
Implementation Method 2
The post-boost capacitor is charged with the boosted voltage from the booster circuit
Implementation Method 3
The power converter capacitor is connected in parallel with the power converter between the power supply line and the ground line, and is charged with the voltage applied to the power converter
Data Source
AI summary
A power converter of a load drive device is provided between a power supply line and a ground line connected to the battery, and converts a direct-current power of the battery and supplies it to a load. A booster circuit boosts a voltage of the battery supplied via the power supply line. A post-boost capacitor is charged with a boosted voltage by the booster circuit. A specific regulator operates a target circuit when a voltage equal to or higher than a lower limit value is applied via a power supply path. At least the voltage charged in the post-boost capacitor is applied to the specific regulator.