Power Circuit Noise Loop via Conductive Plate
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Solution Overview
Problem
Existing power circuit devices fail to effectively restrict noise propagation from a load into a system power supply, particularly when a grounding capacitor is included at either end of a common mode coil, leading to inadequate noise attenuation and complex noise propagation paths due to parasitic capacitance from semiconductor modules and radiators.
Innovation Solution
A power circuit device configuration that connects a first electrical wire between the positive polarity of a rectifier circuit and an inverter, a second electrical wire between the negative polarity of the rectifier circuit and the inverter, and a ground wire terminal by a conductive plate, forming a noise loop that collects noise from the load and restricts its propagation to the system power supply through the ground wire terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If grounding capacitors are included at either end of a common mode coil to increase noise attenuation, then noise attenuation is improved, but a noise transmission path is formed through the rectifier circuit, grounding capacitors, conductive plate, system power supply, ground, metal frame, floating capacitance, bypass capacitor, and rectifier circuit without passing through the common mode coil, reducing the effectiveness of noise attenuation
Solution Approach 1:
The patent extracts the noise collection function from the complex existing path and concentrates it into a dedicated noise loop formed by the conductive plate connecting the first electrical wire, second electrical wire, and ground wire terminal. This separates the noise attenuation function from the power supply circuitry, preventing noise from propagating through the system power supply while maintaining effective attenuation.
Solution Approach 2:
The conductive plate acts as an intermediary element that provides a dedicated path for noise currents to flow through the ground wire terminal without entering the system power supply. This mediator structure redirects noise away from sensitive components while maintaining the grounding function.
2Object-affected harmful factors
If a conductive plate is used to restrict common mode noise current flow into the metal frame, then radiation noise is reduced, but the noise propagation path becomes complex due to parasitic capacitance from semiconductor modules and radiators
Solution Approach 1:
The patent extracts the noise collection function from the complex existing path and concentrates it into a dedicated noise loop formed by the conductive plate connecting the first electrical wire, second electrical wire, and ground wire terminal. This separates the noise attenuation function from the power supply circuitry, preventing noise from propagating through the system power supply while maintaining effective attenuation.
Solution Approach 2:
The patent segments the grounding system into separate functional paths: a dedicated noise loop for common mode noise currents through the conductive plate and ground wire terminal, and a separate power supply path. This segmentation prevents noise from coupling into the power supply circuitry and eliminates complex propagation paths through semiconductor modules and radiators.
3Object-affected harmful factors
If the conductive plate connects the first electrical wire, second electrical wire, and ground wire terminal to form a noise loop, then noise propagation to the system power supply is restricted, but the configuration complexity increases
Solution Approach 1:
The patent merges the grounding function with noise collection by using the conductive plate to connect the first electrical wire, second electrical wire, and ground wire terminal into a unified noise loop structure. This combined structure simultaneously provides grounding and directs noise currents away from the system power supply, achieving multiple functions without proportionally increasing 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
This configuration effectively reduces noise propagation to the metal frame and subsequently to the system power supply, enhancing noise attenuation and simplifying noise paths by forming a dedicated noise loop that collects and directs noise away from the metal frame.
Implementation Method 1
a first electrical wire, which connects a positive polarity side of a rectifier circuit and an inverter, and a second electrical wire, which connects a negative polarity side of the rectifier circuit and the inverter, and a ground wire terminal are connected by a conductive plate, thereby forming a loop that can collect noise flowing out from a load
Implementation Method 2
a bypass capacitor of a circuit configuring a power supply circuit are connected, and by the common mode noise current being taken in and connected to one point on the metal frame via an inductor
Data Source
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AI summary
Even when a grounding capacitor is included at either end of a common mode coil, there is noise that flows from a load into a metal frame, and there is a need to restrict an amount of noise propagating to a system power supply. Because of this, a noise loop is formed of a rectifier circuit, an inverter, a first electrical wire that connects a positive polarity side of the rectifier circuit and the inverter, a second electrical wire that connects a negative polarity side of the rectifier circuit and the inverter, a ground wire terminal that can connect a load connected to an output terminal of the inverter, and a conductive plate that connects at least one of the first electrical wire and second electrical wire and the ground wire terminal.