Design of High-Voltage Switch-Mode Power Amplifier Based on Digital-Controlled Hybrid Multilevel Converter

Figure 9

Oscilloscope screenshots of automatic protection. (a) CH1: failure alarm signal and CH2: first closed SM1 signal. (b) CH1: failure alarm and CH2: last closed PWM signal (2 V/div, 200 us/div).

(a)

(b)