DC Voltage Clamping Control for Hybrid Vehicle Capacitors
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Solution Overview
Problem
Hybrid vehicles face voltage stress issues due to high voltage loads from batteries or motors, which can lead to voltage spikes in DC capacitors, potentially damaging components and triggering over-voltage protection.
Innovation Solution
A DC voltage clamping control system and method that uses a controller to generate a modulated voltage for a direct current capacitor by outputting a reference current through a DC voltage clamping control block, responding to a difference between feedback and reference voltages exceeding a threshold to prevent voltage spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage loads are used from hybrid battery or motor, then power output is improved, but voltage stress and voltage spikes increase
Solution Approach 1:
The patent introduces a DC voltage clamping control block as an intermediary between the high voltage load and the DC capacitor. This control block actively regulates the voltage by comparing feedback voltage with reference voltage and generating appropriate control signals, thereby mediating the harmful voltage stress and spikes while allowing high power output to continue.
Solution Approach 2:
The patent implements a feedback mechanism where the feedback voltage from the DC capacitor is continuously monitored and compared with the reference voltage. Based on this comparison, the DC voltage clamping control block adjusts its output to maintain voltage within safe limits, creating a closed-loop control system that prevents voltage spikes while preserving power output capability.
2Reliability
If voltage clamping control is implemented, then voltage spikes are prevented, but device complexity increases
Solution Approach 1:
The DC voltage clamping control block is designed to perform multiple functions: voltage monitoring, comparison, threshold detection, and control signal generation. By consolidating these functions into a single multi-functional block, the patent achieves effective voltage stabilization without proportionally increasing overall system complexity.
Solution Approach 2:
The control system operates by monitoring voltage parameters (feedback voltage vs. reference voltage) and making adjustments based on predefined thresholds. This parameter-based control approach provides reliable voltage stabilization through simple threshold comparisons and proportional adjustments, avoiding the need for complex control algorithms or additional hardware components.
Data Source
AI summary
A vehicle system in a hybrid vehicle comprises a controller configured to generate for output a modulated voltage to a direct current capacitor to prevent voltage spikes on the capacitor in response to receiving a reference current via a direct current voltage clamping control block that outputs a reference current in response to a difference between a feedback voltage and a reference voltage exceeding a threshold.