Adjusting Switch-Mode Power Supply Frequency to Reduce Harmonic Interference
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Solution Overview
Problem
Radio receivers face interference issues due to harmonics from switch-mode power supplies, particularly as frequency increases and integration occurs, which can degrade performance.
Innovation Solution
The switching rate of the switch-mode power supply is adjusted to ensure that harmonics fall outside the frequency band of interest, using methods such as incremental adjustments or lookup tables to select non-interfering switching rates, thereby mitigating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switching frequency of the power supply is increased to improve power conversion efficiency, then the power supply performance is improved, but the harmonics of the switching rate may fall within the frequency band of interest and adversely affect the radio receiver performance
Solution Approach 1:
The patent applies dynamics by making the switching rate adjustable rather than fixed. The system dynamically selects different switching rates based on the operating conditions and frequency band of interest, allowing the switching rate to be optimized for each scenario to avoid harmonic interference while maintaining efficient power conversion.
Solution Approach 2:
The patent changes the parameter of switching rate to resolve the contradiction. By varying the switching rate parameter, the system can shift the harmonic frequencies away from the frequency band of interest, thereby eliminating interference while maintaining acceptable power conversion efficiency.
2Object-affected harmful factors
If the bandwidth of the radio receiver is narrowed to reduce adjacent channel interference, then the receiver's selectivity is improved, but the ability to receive signals across a wide frequency range is reduced
Solution Approach 1:
The system dynamically adjusts the switching rate based on the current frequency band and operating conditions. This dynamic adaptation allows the receiver to maintain narrow bandwidth for selectivity when needed while being able to switch to different switching rates to accommodate various frequency bands, thus resolving the contradiction between selectivity and versatility.
3Device complexity
If the switch mode power supply is integrated with the radio receiver to reduce device count, then the device complexity is reduced, but the harmonics of the switching rate can directly interfere with the radio receiver performance
Solution Approach 1:
The integrated system uses dynamic switching rate adjustment to manage the interference problem. By making the switching rate variable and adaptable to the operating frequency band, the system can maintain integration benefits while preventing harmonic interference through real-time parameter optimization.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor the operating conditions and adjust the switching rate accordingly. This feedback loop ensures that the switching rate is continuously optimized to avoid generating harmonics within the frequency band of interest, thereby managing the interference problem in the integrated system.
Data Source
AI summary
A method for mitigating interference from a switched-mode power supply begins by comparing a channel of interest of a plurality of channels with a switching rate of a switch-mode power supply. The method continues when the channel of interest compares unfavorably to the switching rate by adjusting the switching rate of the switch-mode power supply until the channel of interest compares favorably to the switching rate.