Spurious Components Reduction in SMPS Supply Voltage
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Solution Overview
Problem
Switched mode power supplies (SMPS) generate spurious components, such as harmonic frequency components, which can degrade the performance of other circuits by coupling these unwanted frequencies into the output voltage, leading to performance issues in electronic systems.
Innovation Solution
An integrated circuit with a spurious components cancellation circuit that receives a supply voltage from an SMPS, generates a reference frequency, adjusts the amplitude and phase of a clock signal to form a compensation signal, and adds it to the supply voltage to reduce harmonic frequency components, thereby producing a modified supply voltage with minimized spurious components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If switched mode power supply (SMPS) is used for efficient power conversion, then energy efficiency is improved, but spurious harmonic frequency components are generated that degrade circuit performance
Solution Approach 1:
The patent generates a compensation signal at the same harmonic frequencies as the spurious components but with opposite phase. By adding this compensation signal to the supply voltage, the harmful harmonic components are cancelled out through destructive interference, converting the harmful spurious signals into a beneficial cancellation effect that preserves the efficiency benefits of SMPS while eliminating performance degradation
Solution Approach 2:
The patent applies preliminary anti-action by generating the compensation signal in advance with the correct amplitude and phase characteristics to counteract the spurious components before they can degrade circuit performance. The compensation signal is prepared with opposite phase characteristics and added to the supply voltage proactively, preventing the harmful effects of harmonic frequencies before they impact connected circuits
2Reliability
If spurious components are reduced by filtering, then circuit performance is improved, but power conversion efficiency decreases and energy loss increases
Solution Approach 1:
Instead of using traditional filtering that dissipates energy, the patent converts the harmful spurious components into a beneficial cancellation effect by generating compensation signals with opposite phase. This approach maintains power conversion efficiency while improving circuit performance, avoiding the energy loss associated with conventional filtering methods
Solution Approach 2:
The patent employs feedback by monitoring the spurious components generated by the SMPS and dynamically adjusting the compensation signal to counteract them. This closed-loop approach ensures that circuit performance is maintained without requiring excessive filtering that would cause energy loss, as the compensation is applied precisely where and when needed
Data Source
AI summary
An integrated circuit includes a first input port configured to receive a supply voltage from a switched-mode power supply (SMPS), where frequency components of the supply voltage include harmonics of a reference frequency, where the reference frequency is equal to a first frequency divided by a factor; and a spurious components cancellation circuit coupled to the first input port, where the spurious components cancellation circuit is configured to: generate a first clock signal having the reference frequency; adjust an amplitude and a phase of the first clock signal to form a compensation signal; and add the compensation signal to the supply voltage to produce a modified supply voltage with reduced frequency components at one or more harmonic frequencies of the reference frequency.