Motor Power Supply Common-Mode Filter for AC Noise Suppression
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Solution Overview
Problem
Existing EMI filters are ineffective in removing noise signals, particularly common-mode currents, and fail to address disturbance power (DP) noise.
Innovation Solution
An electronic device incorporating a power supply system with a common-mode filter comprising three inductors and capacitors, connected in specific configurations to effectively filter out noise signals, including a common-mode filter with first, second, and third inductors wound around cores, and a differential-mode filter connected with the second common-mode filter and X capacitor section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If three inductors are used in the common-mode filter, then common-mode current filtering is improved, but device complexity increases
Solution Approach 1:
The first, second, and third inductors of the common-mode filter are wound around a shared first core, merging their magnetic paths into a single common-mode choke structure. Similarly, the fourth and fifth inductors are wound around a shared second core. This merging approach improves common-mode current filtering effectiveness while consolidating the physical structure, reducing the number of separate components compared to using individual inductors for each function.
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 removes common-mode and differential-mode noise, ensuring stable power supply to motors, particularly brushless direct current (BLDC) motors, by utilizing a three-terminal common-mode choke coil and additional capacitors and inductors.
Implementation Method 1
a first common-mode filter including a first core and first, second, and third inductors wound around the first core
Implementation Method 2
The first core may be made of a magnetic material, and the first inductor, the second inductor, and the third inductor may be wound around the first core in the same direction
Data Source
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AI summary
This electronic device comprises: a motor; a power source supply device for supplying a power source to the motor; and at least one processor for controlling the motor, wherein the power source supply device includes: a power source terminal unit, which includes a ground line and receives an AC power source through a first input end, a second input end, and a third input end; an EMI filter for canceling noise included in the AC power source; and a first common mode filter which includes a ground end of the power source supply device, and a first core, and a first inductor, a second inductor and a third inductor that are wound around the first core, which uses the third inductor to connect, to the ground end, the third input end connected to the ground line, and which uses each of the first inductor and the second inductor to connect the remaining first input end and second input end to the EMI filter.