Variable Y-Capacitor Structure for Noise Attenuation Control
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Solution Overview
Problem
Existing capacitor solutions for noise attenuation in high-voltage electric power conversion systems have limited noise attenuation bands, restricting their effectiveness in improving electromagnetic compatibility and multimedia performance in vehicles.
Innovation Solution
A structure for variably controlling a Y-capacitor, incorporating switching elements and a controller to adjust the capacitor's configuration based on the operating mode of the infotainment system, allowing for dynamic noise attenuation across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed capacitor is used for noise attenuation, then the structure is simple, but the noise attenuation band is restricted
Solution Approach 1:
The patent applies dynamics by making the capacitor configuration adjustable rather than fixed. Multiple capacitors are connected through switching elements that can change the circuit configuration dynamically based on operating conditions, allowing the noise attenuation characteristics to adapt to different frequency bands and infotainment modes.
Solution Approach 2:
The patent changes the electrical parameters of the noise attenuation circuit by switching between different capacitor configurations. The switching elements alter the capacitance values and connections in real-time, changing the filter characteristics to match different operating modes of the infotainment system.
2Reliability
If a fixed Y-capacitor configuration is used, then the device complexity is low, but the electromagnetic wave performance is limited
Solution Approach 1:
The patent makes the Y-capacitor configuration dynamic by introducing switching elements controlled by a controller. The switching elements can connect or disconnect different capacitors based on the infotainment system's operating mode, thereby dynamically optimizing electromagnetic wave performance for different conditions.
Solution Approach 2:
The patent creates a multi-functional capacitor module that can serve different noise attenuation requirements. The same capacitor module can be configured for different frequency bands and operating modes, making it universally applicable across various infotainment scenarios rather than requiring separate fixed configurations for each mode.
3Productivity
If PWM control is used for power conversion, then the power conversion efficiency is high, but common mode noise is generated
Solution Approach 1:
The patent converts the harmful common mode noise generated by PWM control into a controllable parameter. By using the switching elements to actively manage the capacitor configuration, the system transforms the noise problem into an opportunity for adaptive noise cancellation, where the same PWM-driven switching that creates noise also enables dynamic noise filtering.
Solution Approach 2:
The patent implements feedback control where the controller monitors the operating mode of the infotainment system and adjusts the capacitor configuration accordingly. This closed-loop approach ensures that the noise attenuation characteristics are continuously optimized based on the actual noise conditions generated by the PWM power conversion.
Data Source
AI summary
A structure for controlling a Y-capacitor for reducing common mode noise of an electric power conversion system of an environmentally-friendly vehicle. The structure cooperates with an infotainment system for a vehicle and reduces common mode noise of an electric power conversion system. In particular, the structure includes: a switching element connected to a high-voltage power source coupled to the vehicle and to attenuate noise occurring at the time of PWM control; and an electric power conversion part which receives common mode noise occurring from the power source and controls ON/OFF of the switching elements in order to reduce the received common mode noise.