Conducted emission investigation of infant incubator heating control mode

Abstract

<span lang="EN-US">This paper investigates the effect of two different heating power control systems of infant incubators on their conducted emissions. Two infant incubators which respectively employ zero-crossing control mode and phase angle control mode are observed. The research was conducted by measuring conducted electromagnetic interference (EMI) from each infant incubator's power input. Measurements are conducted both during full power condition, while the incubator's compartment temperature is far away from the temperature setpoint, and during power chopping condition, while the compartment temperature reaches the steady-state set point. Method and limit of the measurement refer to CISPR 11. It is found that conducted emission higher than the standard CISPR 11 limit occurs during power chopping on phase angle control mode. This results from the sharp rise time of voltage delivered to the heater, around 220 ns for each chopping cycle.</span>

Strategic electromagnetic interferences suppression in boost converters: zero-switch techniques

“…To assess these interferences, a line impedance stabilization network (LISN) is commonly used (Figure 10(a)). Serving as a filter between the tested boost converter and the power supply network, the LISN effectively isolates the power supply from the equipment under test, which can create disturbances in common mode and differential mode, as illustrated in Figure 10 This segment of the study conventionally involves the quantification of conducted-mode EMI [21], [22], specifically for the standard boost converter whose features have been detailed earlier. The configuration of the employed chopper encompasses a power source, a conducted emissions measurement device (LISN), a control architecture, and a switching cell integrated with a filter and a resistive output load (refer to Figure 11).…”

Implementing Pseudo-Random Control in Boost Converter: An Effective Approach for Mitigating Conducted Electromagnetic Emissions

“…In relation to the disturbances produced by the tested equipment, it maintains a fixed terminating impedance of 50 ohms (𝑍 𝑙𝑖𝑠𝑛 = 50) (Figure 12 The Isis Proteus software was used to simulate the model depicted in Figure 11, employing the parameters outlined in Table 2. The primary objective of this simulation was to analyze the spectral composition of the voltage 𝑉 𝑙𝑖𝑠𝑛 , which signifies electromagnetic disruptions in both differential and common mode [25]. The central aim of the investigation was to diminish the frequency range of this voltage (power spectral density) within the 150 kHz to 30 MHz interval.…”