Lecture 19: Inverters, Part 3
We can realize more sophisticated multi-level inverters that can directly synthesize more intermediate levels in an output waveform, facilitating nice harmonic cancelled output content.
The two-level inverter takes V dc as an input and generates a 2-level output voltage for a load as + V dc / 2 or V dc / 2. Generally, the PWM technique is used for producing the AC output voltage in inverters. The name multilevel begins with the three-level inverter concept by expanding the number of levels in the device.
Output Waveform Quality Two-Level Inverter: The output waveform of a two-level inverter contains more significant harmonic distortion due to the abrupt transition between the two voltage levels. This requires additional filtering to smooth out the waveform for sensitive applications.
We can realize more sophisticated multi-level inverters that can directly synthesize more intermediate levels in an output waveform, facilitating nice harmonic cancelled output content. Example: Neutral-point clamped inverters (also called ”diode clamped” multi-level inverters).
Here are the key differences between these two types of inverters: Voltage Levels Two-Level Inverter: This type of inverter has two voltage levels at the output. Typically, these are +Vdc (positive DC supply voltage) and -Vdc (negative DC supply voltage).
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