Non-Isolated Power Factor Corrected AC/DC Converter with High Step-Down Voltage Ratio for Low-Power Applications

Table 1

Comparison studies with the literature.

Topology	Ref. [34]	Ref. [35]	Ref. [36]	Ref. [37]	Ref. [38]	Ref. [24]	Proposed
	Quadratic buck series resonant PWM	BB-QB single-stage PFC rectifier	Bridgeless flyback	Bridgeless Cuk-flyback	Boost buck cascaded	Interleaved transformerless	QBC PFC (passive)
No. of switches	3	1	2	3	2	4	1
Diodes	4	9	3	5	5	2	7
Inductors	4	4	Flyback	Flyback along with 4 normal	3	2	4
Capacitors	4	3	1	4	3	5	4
Efficiency	91	83	90	55%–90%	94	93	80%
Conversion ratio	180/60 V	85/5 V	(110–220)/48 V	(160–260)/48 V	110/216	400/25	230/54 V
Remarks	DC-DC	Low power (20 W); High component count (AC-DC)	Power factor of 0.92 (3-winding). 50 W application (48 V, 1 A) (AC-DC)	At 125 W, efficiency is 55%, 90% at 900 W (motor)	60 W (LED application)	DC-DC conversion	150 W