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

Table 3

Comparisons of two power amplifier systems.

Items	PSM-based amplifier	PWM-based amplifier
Modulation	Digital PSM	Analog PWM
Circuit topology	Multilevel	Half bridge
Power supplies	DC 220 V	DC ±80 V
Step-up transformer	No need	Need
Maximum output	±1700 Vp	±1500 Vp
	1400 W	1200 W
THD	1.38%	0.85%
Efficiency	94.2%	82.5%
Gross weight	50 Kg	80 Kg
User interface	Touch LCD	LED indicators

The test condition is outputting 1000 Vrms sine at 1 KHz.