Power Converter Voltage Control via Remote Local Detection Switching
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Solution Overview
Problem
Existing power conversion apparatuses face challenges in maintaining responsiveness and stability when an abnormality occurs in remote voltage detection, often resulting in uncontrolled output voltage due to disconnection or disconnection of terminal issues, especially in in-vehicle systems that experience strong vibrations.
Innovation Solution
A power conversion apparatus that includes semiconductor switches, local and remote voltage detection sections, and a target current calculation section to regulate output voltage by calculating a target current based on the smaller deviation between remote and local voltage, allowing for high responsiveness and reduced part count, even when remote voltage detection is abnormal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PWM signals are generated based on both local voltage and remote voltage to perform switching control, then the output voltage can be controlled based on local voltage when remote voltage detection is abnormal, but the responsiveness decreases when the load fluctuates and the number of parts increases
Solution Approach 1:
The control method dynamically switches between using remote voltage and local voltage based on detection results. When remote voltage detection is normal, it uses remote voltage for control; when abnormal, it switches to local voltage. This dynamic adaptation maintains responsiveness while ensuring reliability.
Solution Approach 2:
The invention changes the control parameter from always using remote voltage to conditionally using either remote or local voltage based on detection status. This parameter change allows the system to maintain high responsiveness during normal operation while ensuring stable control during abnormal conditions.
2Reliability
If PWM signals are generated based on both local voltage and remote voltage to perform switching control, then the output voltage can be controlled based on local voltage when remote voltage detection is abnormal, but the number of parts increases
Solution Approach 1:
The local voltage detection section serves dual purposes: it detects local voltage for control calculations and also serves as a backup when remote voltage detection fails. This multi-functionality reduces the need for separate backup detection circuits, simplifying the overall system.
Solution Approach 2:
The system uses its own local voltage detection capability to back up the remote voltage detection function. When remote detection fails, the system self-corrects by using locally detected voltage, eliminating the need for external backup systems or additional parts.
3Measurement precision
If remote voltage detection is used to compensate for voltage drop due to interconnection resistance, then accurate output voltage control is achieved, but disconnection between remote voltage detection means and power conversion apparatus may be caused due to strong vibrations
Solution Approach 1:
The system prepares for potential remote voltage detection failure by having local voltage detection ready as a backup. This beforehand preparation ensures that when vibrations cause disconnection in the remote detection path, the system can immediately switch to local detection without loss of control.
Solution Approach 2:
The system implements feedback by continuously monitoring both remote and local voltage detections. When remote voltage detection becomes abnormal, the feedback mechanism triggers a switch to using local voltage for control calculations, maintaining accurate voltage control despite the disconnection.
Data Source
AI summary
Power conversion apparatus converts input voltage and supplies output voltage to the electric load. The apparatus includes a semiconductor switch switches between open and closed states to regulate voltage control current for controlling output voltage, a first voltage detection section detects remote voltage being applied to the electric load as output voltage, a second voltage detection section detects a local voltage being applied to the output terminal as output voltage, a target current calculation section calculates target current which is the voltage control current target value, based on voltage deviation between target voltage which is the output voltage target value and either remote voltage or local voltage, and a switch control section controls the semiconductor switch so voltage control current becomes target current, to regulate output voltage to target voltage. The target current calculation section calculates the target current by using one of the remote or local voltage corresponds to a smaller target current.