EMI Reducing Circuit Using Random Number Modulation
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Solution Overview
Problem
High power motors generate significant electromagnetic radiation, causing interference with other electronic system circuits and affecting normal operations.
Innovation Solution
An electromagnetic interference reducing circuit is introduced, comprising a motor driver circuit with a first oscillator, a first random number generator, and a motor controller circuit, which modulates triangular wave signals to adjust the frequency of motor signals, preventing interference by using multiple phase controller circuits and a charging pump to manage voltage and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power motors are used to meet performance requirements, then motor power performance is improved, but electromagnetic radiation interference increases
Solution Approach 1:
The patent applies dynamic frequency modulation by using a random number generator to continuously vary the operating frequency of the motor driver circuit. This dynamic adjustment prevents the motor from operating at fixed frequencies that could resonate with other electronic components, thereby reducing electromagnetic radiation interference while maintaining high power performance.
Solution Approach 2:
The patent changes the frequency parameter of the motor operation by modulating the PWM signal frequency based on random numbers. This parameter change transforms the motor's electromagnetic characteristics, preventing consistent radiation patterns and reducing interference with other electronic systems while preserving motor power output.
2Object-generated harmful factors
If frequency modulation is applied to reduce electromagnetic interference, then electromagnetic radiation interference is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a random number generator as an intermediary component that modulates the frequency of the motor driver circuit. This intermediary element adds minimal complexity while effectively randomizing the operating frequency to reduce electromagnetic interference. The random number generator serves as a simple yet effective mediator between the control system and the motor driver.
Solution Approach 2:
The patent uses periodic generation of random numbers to modulate the motor driver frequency. By generating random numbers at regular intervals (e.g., every millisecond), the system achieves frequency variation without requiring complex continuous modulation circuits, thus balancing interference reduction with circuit simplicity.
Data Source
AI summary
An electromagnetic interference reducing circuit is provided. A first random number generator generates a plurality of first random number signals each having a plurality of triangular waves. Each of the triangular waves has a plurality of steps. The first random number generator generates a plurality of first random numbers and modulates each of the first random number signals according to the first random numbers. The first random number generator repeatedly counts, repeatedly removes, or does not count time of the steps of each of the triangular waves of each of the first random number signals according to one of the first random numbers. A first oscillator generates a first oscillating signal. A motor controller circuit controls a plurality of switch components of a motor respectively according to the first random number signals based on the first oscillating signal.