Single-Phase Five-Level Active Clamping Converter Unit and Converter

A single phase five-level active neutral-point clamped converter unit with three input terminals and one output terminal, comprising:

• six bidirectional switches, a flying capacitor and two diodes;
• wherein the first terminal of the first bidirectional switch is connected to a first input terminal;
• the second terminal of the first bidirectional switch is connected to both the first terminal of the second bidirectional switch and the positive terminal of the flying capacitor;
• the second terminal of the second bidirectional switch is connected to both the first terminal of the third bidirectional switch and the output terminal;
• the second terminal of the third bidirectional switch is connected to both the first terminal of the fourth bidirectional switch and the negative terminal of the flying capacitor;
• the second terminal of the fourth bidirectional switch is connected to a second input terminal;
• the first terminal of the fifth bidirectional switch is connected to the positive terminal of the flying capacitor;
• the second terminal of the fifth bidirectional switch is connected to the positive terminal of the first diode;
• the second terminal of the sixth bidirectional switch is connected to the negative terminal of the flying capacitor;
• the first terminal of the sixth bidirectional switch is connected to the negative terminal of the second diode;
• the negative terminal of the first diode is connected to both the positive terminal of the second diode and a third input terminal.