Voltage Generating Circuit EMI Noise Reduction via Pre-Driving
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Solution Overview
Problem
Conventional voltage generating circuits face inefficiencies in reducing electromagnetic interference (EMI) noises, particularly at higher frequencies, which can lead to reduced system efficiency when attempting to mitigate these issues.
Innovation Solution
A voltage generating circuit and pre-driving signal generating module that utilize a signal frequency hopping control method to adjust the slew rate or ringing component of the voltage signal, incorporating a pre-driving unit and voltage generating unit, along with signal enhancing and adjusting circuits, including push-pull circuits and switch units, to effectively reduce high-frequency EMI noises while maintaining system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the slew rate of the driving signal is reduced to solve EMI noises, then the EMI noises are reduced, but the system efficiency is reduced
Solution Approach 1:
The patent introduces a pre-driving unit that generates a pre-driving signal before the main driving signal. This pre-driving signal performs preliminary action by pre-charging or pre-discharging the load capacitance, thereby reducing the slew rate of the main driving signal and mitigating EMI noises without significantly impacting system efficiency.
Solution Approach 2:
The pre-driving unit acts as an intermediary between the oscillation signal source and the voltage generating unit. It processes the oscillation signal to create a pre-driving signal with controlled slew rate, which then drives the voltage generating unit. This intermediary structure allows EMI reduction while maintaining overall system performance.
2Object-affected harmful factors
If conventional signal frequency hopping control method is used to reduce EMI noises, then low frequency EMI noises are reduced, but high frequency EMI noises are not effectively addressed
Solution Approach 1:
The patent employs signal frequency hopping control that dynamically changes the operating frequency of the oscillation signal. By hopping between multiple frequency points, the system avoids concentrated EMI emissions at any single frequency, effectively reducing both low frequency and high frequency EMI noises. The frequency hopping mechanism modifies the temporal parameters of the signal to disperse electromagnetic interference across a broader spectrum.
Data Source
AI summary
A voltage generating circuit including a pre-driving unit and a voltage generating unit is provided. The pre-driving unit receives an oscillation signal and enhances a driving capability of the oscillation signal to generate a pre-driving signal. The voltage generating unit receives an input signal and the pre-driving signal, and generates an output signal according to the input signal and the pre-driving signal. The voltage generating unit generates a voltage signal according to the pre-driving signal. One of the pre-driving unit and the voltage generating unit adjusts a slew rate or a ringing component of the voltage signal by using the pre-driving signal. A pre-driving signal generating module for driving a voltage generating circuit is also provided.