The accurate input impedances of a DC-DC converters connected to the network

Analytical Models Synthesis of Power Electronic Converters

“…Any input signal Sin(t) crossing throw any switching cell, as drawn in the Fig.4, is chopped according to the control law sw(t) of the switching cell. The system outputs may be expressed according to (3). The switching operator sw(t), which is a Tsw-periodical function, actually establishes the switching law of the converter's devices and depends on the control strategy, which in this case concerns the buck and the boost converters' control, considering the duty cycle"α".…”

“…Since the function sw(t) corresponds to the switching signals, we can imagine that its shape in the temporal domain, is a "one" and "zero" sequence level as drawn in the Fig.5. According to the signal processing theory, the switching operator may be expressed as in (4), by the convolution between two conventional functions, [1][2][3] and [11]:…”

“…Where Ih regroup the noise current source, generated when the converter's operation. YMD is the converter's DM admittance [3].…”

“…In order to comply with ElectroMagnetic (EMC) standards, an accurate prediction of a common mode (CM) and differential mode (DM) conducted noise is necessary. Furthermore, since ElectroMagnetic Interference (EMI) filters are coupled to converters, the optimisation is necessary reached with the knowledge of converter's impedances [1][2][3].Several papers treat the converter's modelling with different techniques: Terminated/Unterminated models [4][5][6], lumped circuits [7][8][9][10]...etc. However, the proposed models deal only with one kind of converter, this cannot be generalised to other conditions, due to the parameter's dependency.…”

Evaluation of Conducted Disturbances Generated by the Chopper-rectifier Association Propagating to the Electrical Network

“…These power converters use fast switching power semiconductor switches, such as MOSFET (Metal-oxide semiconductor field effect transistor), IGBT (Insulated Gate Bipolar Transistor) as the preferred switching devices because of their various properties, such as higher efficiency, smaller size, and lower overall cost, low losses associated with switching device. However, the fast switching speed of new converter technologies has the potential to cause EMI and high dv/dt [3][4][5][6].…”