Methods of Reducing Audible Noise Caused by Magnetic Components in Variable-Frequency-Controlled Switch-Mode Converters
- Resource Type
- Periodical
- Authors
- Huber, L.; Jovanović, M. M.
- Source
- IEEE Transactions on Power Electronics IEEE Trans. Power Electron. Power Electronics, IEEE Transactions on. 26(6):1673-1681 Jun, 2011
- Subject
- Power, Energy and Industry Applications
Aerospace
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
General Topics for Engineers
Nuclear Engineering
Signal Processing and Analysis
Transportation
Switching frequency
Acoustic noise
Switches
Converters
Magnetic flux
Magnetic cores
Power supplies
Audible noise
continuous feedback control (CFC)
peak current programming
switching frequency monitoring
switch-mode converters
variable switching frequency (VSF)
- Language
- ISSN
- 0885-8993
1941-0107
Methods and a circuit implementation of audible noise reduction (ANR) in switch-mode converters with variable switching frequency are presented. The audible noise caused by magnetic components is reduced by controlling the switching frequency so that it remains above the audible range as the load decreases. This is accomplished by decreasing the peak value of the main switch current pulses in discrete steps until the peak value of the main switch current pulses is decreased to a level that is sufficiently low not to produce unacceptable audible noise. At very light loads and at no load, the ANR circuit can be disabled in order to meet various worldwide standards that limit the maximum input power. The performance of the proposed circuit was experimentally verified in a 90-W single-stage power-factor-correction flyback adapter.