Power Converter Voltage Stabilization for Hybrid Electric Vehicles
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Solution Overview
Problem
In hybrid electric vehicles, the system reliability is compromised due to voltage imbalances caused by high-voltage battery failures or low temperatures, leading to overvoltage or undervoltage issues that can cause the entire system to stop functioning.
Innovation Solution
A power converter system with a power converting circuit, output current control circuit, high-voltage control circuit, low-voltage control circuit, and driving circuit that detects and regulates voltage and current signals to stabilize the voltage levels, ensuring the system operates within safe ranges even when the high-voltage side energy storage device is disconnected or abnormal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage batteries are used in hybrid electric vehicles, then the power source capability is improved, but the system reliability deteriorates due to voltage imbalances caused by battery failures or low temperatures
Solution Approach 1:
The patent introduces a generator as an intermediary power source between the high-voltage battery and the low-voltage battery. When the high-voltage battery fails or operates at very low temperatures, the generator acts as a mediator to balance the voltage and provide necessary power, preventing system failure and maintaining reliability
Solution Approach 2:
The patent implements dynamic parameter changes by monitoring the state of charge and voltage levels of both high-voltage and low-voltage batteries. The control system adjusts operating parameters such as generator activation timing and power conversion circuit operation to maintain voltage balance and prevent overvoltage or undervoltage conditions
2Reliability
If the generator is added to balance voltage, then the system reliability is improved, but the device complexity increases
Solution Approach 1:
The patent designs the generator and power conversion circuit to serve multiple functions: normal power generation, voltage balancing during battery failures, and low-temperature operation support. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity
Solution Approach 2:
The patent combines the generator with the existing power conversion circuitry, merging the voltage balancing function with the power management system. This integration approach allows the generator to be controlled through the existing control architecture, reducing overall system complexity compared to a fully separate system
3Measurement precision
If multiple control circuits are implemented, then the voltage regulation precision is improved, but the device complexity increases
Solution Approach 1:
The patent segments the control function into distinct control circuits: a first control circuit for managing normal operation and a second control circuit for handling abnormal conditions. This segmentation allows each circuit to be optimized for its specific function, improving voltage regulation precision while maintaining manageable complexity through functional separation
Solution Approach 2:
The patent implements dynamic control switching between different control circuits based on system conditions. The control system dynamically selects which circuit to activate based on battery state, temperature, and voltage levels, allowing precise regulation adaptability without requiring all control circuits to operate simultaneously, thus limiting complexity
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 solution effectively stabilizes the voltage levels, preventing system failures and ensuring the vehicle can operate normally, thereby enhancing system reliability and preventing voltage-related malfunctions.
Implementation Method 1
The power converting circuit is configured to receive a High Voltage Direct Current voltage from a high-voltage side, to convert the High Voltage Direct Current voltage to a Low Voltage Direct Current voltage
Data Source
AI summary
A power converter includes a power converting circuit, an output current control circuit, a high-voltage control circuit, a low-voltage control circuit, and a driving circuit. The power converting circuit receives and converts a HV dc voltage from a HV side to a LV dc voltage to a LV side. The output current control circuit is configured to detect an output current and output a first control signal. The high-voltage control circuit is configured to detect the HV dc voltage and output a second control signal. The low-voltage control circuit is configured to detect the LV dc voltage and output a third control signal selectively according to the LV dc voltage, or the LV dc voltage and the first control signal, or the LV dc voltage and the second control signal. The driving voltage outputs a driving signal to drive the power converting circuit according to the third control signal.