Analysis and mitigation of conducted EMI in current mode controlled DC–DC converters

Abstract

Practically, power electronic circuits (PECs) generate electromagnetic interference (EMI) which influence the operation of electronic equipment and may create instabilities. PECs must comply with electromagnetic compatibility standards for stable periodic operation but indeed fail under certain conditions. This study reports the effect of conducted EMI in a current mode controlled higher-order DC-DC converter fed from a pulsating DC voltage instead of a stiff DC voltage. The converter is found to be a source of conducted EMI under light loading conditions adversely affecting the systems' stability. A non-feedback control technique is implemented to mitigate the instabilities caused by EMI and to make the system electromagneticaly compatible. A mathematical model is developed to describe the dynamics involved. Simulation and experimental results are presented to support the analyses documented.

Reducing Electromagnetic Interference in Three-Level T-type Isolated Bidirectional DC-DC Converter Using a Snubber Circuit

“…Any noise reduction method is not presented in the study. Subramanian and Govindarajan [11] propose a non-feedback control technique using the concept of resonant parametric perturbation for EMI suppression. Iftikhar et al [12] propose an LC input filter design to suppress EMI for boost converter and examine instability issues resulting from the filter and converter interaction.…”

“…The parasitic effects of the component are integrated into the circuit model for an accurate and realistic simulation. Circuit design and control parameters were determined using reference [11]. Important control parameters of the converter are selected as below.…”

EMI filter design for single‐phase grid‐connected inverter with noise source impedance consideration

“…Wide bandgap semiconductors such as silicon carbide (SiC) and gallium nitride, which are characterised by high switching speeds, are being widely used in power converters to achieve greater efficiencies and higher power densities. However, the high voltage transition rate (d v/ d t ) and high current transition rate (d i/ d t ) result in more serious electromagnetic interference (EMI) issues [1–5], which may affect the system safety and reliability. Therefore, power converters should fulfil the regulatory electromagnetic compatibility standards.…”

Conducted common‐mode electromagnetic interference suppression in the AC and DC sides of a grid‐connected inverter

“…EMI noise flows in the inverter system in the form of a common‐mode (CM) current and a differential‐mode (DM) current. The current not only affects the normal operation but also accelerates component ageing [8–10].…”

“…To attenuate EMI noise, many studies have been conducted. [10, 11] employed passive EMI filter components to suppress the noise and presented a design procedure for a DC‐side or AC‐side EMI filter. [12] limited the switching speed by closed‐loop gate voltage control to reduce the conducted emissions.…”