Closed-Loop Gate Drive for Single-Ended Forward Converter to Reduce Conducted EMI
TLDR
Simulation and experimental results show that the proposed method can achieve voltage shaping and suppression of voltage overshoot effectively and can make the high-frequency components of the drain-source voltage of the primary-side MOS transistor and the secondary-side output voltage have a greater attenuation.Abstract:
Forward DC/DC converters are widely used in low and medium power circuits that are widely used in the aerospace and navigation fields Power converters are usually sources of electromagnetic interference (EMI), which is due to their higher voltage and current transients The traditional method is to add expensive filters on the primary side or the secondary side, but its disadvantages are high cost and poor adjustability Based on the principle that the greater the number of derivations of voltage transients, the lower the high frequency electromagnetic interference contained in this voltage, a signal containing small high-frequency noise that is suitable for the hardware circuit as a reference signal is selected, and a closed-loop gate drive method is used in this paper, which attenuate the conducted EMI noise in the input bus of the forward DC/DC converter The reference signal shapes the output signal to achieve the purpose of suppressing electromagnetic interference through the closed loop circuit The advantages of this method are making the output highly adjustable, reducing hardware size and weight and lower cost compared with filter method Compared with the method of controlling current to reduce electromagnetic interference, the proposed method is easier to implement Firstly, the relationship between the derivative order of voltage transient and electromagnetic interference is introduced Secondly, the experimental principle of single-ended forward circuit controlled by closed loop is introduced Simulation and experimental results show that the proposed method can achieve voltage shaping and suppression of voltage overshoot effectively Compared with the traditional hard-switching control method, the proposed method can make the high-frequency components of the drain-source voltage of the primary-side MOS transistor and the secondary-side output voltage have a greater attenuationread more
Citations
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Multivariable Unconstrained Pattern Search Method for Optimizing Digital PID Controllers Applied to Isolated Forward Converter
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Analysis of Power Loss in Forward Converter Transformer Using a Novel Machine Learning Based Optimization Framework
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References
More filters
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Separation of the common-mode- and differential-mode-conducted EMI noise
TL;DR: In this paper, a device is developed to decipher common-mode and differential-mode noise from a conducted EMI noise measurement, which is a useful tool for power supply circuit noise diagnosis and line filter design.
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Active Voltage control of IGBTs for high power applications
TL;DR: In this article, the authors exploit the active behavior of IGBT, applying a voltage feedback loop to the IGBT to control its switching, and show that adding a bias to the demand reference waveform shifts IGBT into the active region and permits wide bandwidth operation over most of the switching transient.
Journal ArticleDOI
Shaping High-Power IGBT Switching Transitions by Active Voltage Control for Reduced EMI Generation
TL;DR: In this article, active voltage control is applied and improved successfully to define IGBT switching dynamics with a smoothed Gaussian waveform, which can suppress high-frequency spectrum of EMI emissions.
Journal ArticleDOI
Graphical analysis of the spectra of EMI sources in power electronics
TL;DR: In this article, a new method of analysis is proposed to graphically predict the spectrum envelope of electromagnetic interference (EMI) emitted by power electronics equipment, and the relationship between the time-domain and the frequency-domain (spectrum) of some typical EMI signals observed in power converters is pointed out.
Journal ArticleDOI
Analysis and Design of Forward Converter With Energy Regenerative Snubber
TL;DR: In this paper, an energy regenerating snubber for a forward converter is presented, which uses a tertiary transformer winding and beneficially exploits transformers' leakage inductances, and is capable of resetting the transformer, as well as eliminating leakage inductance voltage spike across the power switch.