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Applikationsberichte
Modern power electronics enable a wide variety of devices to connect to the power grid—from switch-mode power supplies (SMPS) and variable-frequency drives (VFDs) to uninterruptible power supplies (UPSs) and light-emitting diodes (LEDs) to battery chargers, inverters, and generators. Many of these devices depend on non-linear components to minimize size and cost, and maximize reliability and performance. But this requires the designer to pay special attention to the impact non-linear current flows have on the signal integrity of the input mains power.
SMPS, for example, are common in electronic equipment, such as computers, monitors, and televisions. These devices typically draw non-linear current and are therefore significant sources of harmonics on the power network, as shown in Figure 1. The same applies to VFDs, which are often used with AC motors, such as those found in household appliances and HVAC equipment. And even LED lamps, despite their lower power, can produce significant harmonics if many are used in parallel.
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