What is a current source inverter (CSI) topology?

A promising alternative to the conventional VSI with its limitation is the application of a current source inverter (CSI) topology, as discussed in [3, 4, 5]. The CSI inherently filters the output quantities, i.e., inverter output voltages and output currents, mitigating the negative effects of high switching frequencies.

What is the topology of a 1 kW UPS inverter?

The topology is verified with 1 kW with 270 V of input and 100-V RMS at the output as UPS inverter. Other clamping circuit approaches were addressed in .

How do the averaged switch node currents correspond to the inverter's output currents?

As the high-frequency AC component of is filtered by the filter capacitors, the averaged switch node currents correspond to the inverter’s output currents where is the complex representation of the output currents , , and according to Equation (1).

Are isolated matrix inverters better than two-stage power converters?

Average efficiency of today’s isolated matrix inverters is comparable with the two-stage power converters; however, due to absence of DC-link they can provide higher reliability and lower cost. 1. CSI Based Isolated Matrix Topologies 1.1. Non-Resonant Bridge Topologies 1.1.1. Full Bridge Configuration

What is a resonant inverter?

The resonant inverter based on the topology from Figure 13 was introduced in and described in more detail in . It uses a resonant capacitor in series to the leakage inductance. The topology is proposed for the UPS application and features a lower output voltage ripple.

What is pulse width modulation (PWM) in an inverter?

Using pulse-width modulation (PWM) in the inverter stage, this constant DC current is then shaped into arbitrary three-phase current waveforms, , , and , which are finally delivered to the load. The capacitors are required for basic operation of the structure and filter the output voltage, thus eliminating the need for additional output filters.