Power Converter Voltage Regulation via Dual Control Circuits
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Solution Overview
Problem
In vehicle power systems, unbalanced generator and load conditions lead to unstable voltage, triggering overvoltage or undervoltage protection mechanisms, which can cause the system to stop functioning, degrading reliability and preventing vehicle operation.
Innovation Solution
A power converter system with high-voltage and low-voltage sides, including control circuits and a driving circuit that detect and regulate voltages to maintain stable voltage levels by selectively activating high-voltage, low-voltage, or output current control signals, ensuring the system operates within safe ranges even when the high-voltage energy storage device is decoupled or in an abnormal state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high-voltage energy storage device is decoupled or in an abnormal state, then the system loses its primary voltage regulation capability, but the system can still maintain stable operation by switching to high-voltage control circuit regulation
Solution Approach 1:
The system performs preliminary action by detecting the abnormal state of the high-voltage energy storage device in advance and proactively switching to the high-voltage control circuit for voltage regulation before the system fails. This preventive switching ensures continuous stable operation without interruption.
Solution Approach 2:
The high-voltage control circuit acts as an intermediary when the high-voltage energy storage device is unavailable. It mediates the voltage regulation function by directly controlling the power converting circuit based on detected high-voltage levels, replacing the normal energy storage device regulation path.
2Reliability
If dual control circuits are used for high-voltage and low-voltage regulation, then the system can maintain stability under various conditions, but the device complexity increases
Solution Approach 1:
The high-voltage control circuit and low-voltage control circuit are designed with multi-functionality. Each control circuit can operate independently to regulate its respective voltage level, and both can work in coordinated fashion. This universal design allows the system to maintain voltage stability under various operating conditions while managing complexity through functional integration.
Solution Approach 2:
The control system implements dynamic switching between different control modes. The processing circuit selectively activates either the high-voltage control circuit or the low-voltage control circuit based on real-time system conditions, allowing the system to adapt its complexity level to the actual operational requirements.
3Productivity
If the processing circuit selectively activates control circuits based on system state, then the system can optimize performance for different operating conditions, but the control logic complexity increases
Solution Approach 1:
The processing circuit performs preliminary assessment of system conditions and proactively selects the appropriate control circuit before performance degradation occurs. By detecting system state in advance and pre-selecting the optimal control path, the system optimizes performance without requiring complex real-time decision-making logic.
Solution Approach 2:
The system implements feedback mechanisms where the processing circuit continuously monitors system state and adjusts control circuit activation accordingly. The detection circuits provide feedback on voltage levels and system conditions, enabling the processing circuit to make informed decisions about which control circuit to activate, optimizing performance while managing complexity through feedback-driven control.
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
The system effectively stabilizes voltage levels, preventing protection mechanism activation and ensuring vehicle operation by actively regulating voltages when the high-voltage energy storage device fails or is in an abnormal state, thus enhancing system reliability.
Implementation Method 1
The power converting circuit is configured to receive a High Voltage Direct Current voltage from the high-voltage side and convert the High Voltage Direct Current voltage to a Low Voltage Direct Current voltage to the low-voltage side
Data Source
AI summary
A power converter includes a power converting circuit, a high-voltage control circuit, a low-voltage control circuit, and a driving circuit. The power converting circuit is configured to receive and convert a HVDC voltage from a high-voltage side to a LVDC voltage to a low-voltage side. The high-voltage control circuit is coupled to the high-voltage side and configured to detect the HVDC voltage and output a first control signal according to the HVDC voltage. The low-voltage control circuit is coupled to the low-voltage side and configured to detect the LVDC voltage and output a second control signal according to the LVDC voltage. The driving voltage is configured to selectively output a driving signal to drive the power converting circuit according to the first or the second control signal.