Circuit description and test results

AN2331

8/24

2.1

Efficiency measurements

Table 1, Table 2 and Figure 3 show the overall circuit efficiency measured for different loads

at the nominal input mains range.

Table 2.

Thanks to the good efficiency of the PFC working in transition mode and to the high

efficiency of the resonant stage working in ZVS, the overall efficiency measured is a

significantly high number for a two stage converter with 4 amps of output current.

Figure 3.

Efficiency vs. Pout

Table 1.

Vout [V]

Iout [A]

Pout [W]

Pin [W]

Efficiency [%]

23.88

4.06

96.95

110.40

87.82

23.90

3.0

71.70

81.50

87.98

23.90

2.0

47.80

54.80

87.23

23.90

1.03

24.62

29.00

84.89

23.90

0.504

12.05

15.70

76.72

23.90

0.401

9.58

13.10

73.16

23.90

0.303

7.24

11.00

65.83

23.90

0.203

4.85

8.50

57.08

Vout [V]

Iout [A]

Pout [W]

Pin [W]

Efficiency [%]

23.88

4.06

96.95

107.70

90.02

23.90

3.0

71.70

81.70

87.76

23.90

2.0

47.80

54.00

88.52

23.90

1.03

24.62

28.00

87.92

23.90

0.504

12.05

15.20

79.25

23.90

0.401

9.58

12.70

75.46

23.90

0.303

7.24

10.30

70.31

23.90

0.203

4.85

7.50

64.69

Efficiency vs Pout

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

97

72

48

25

12

10

7

5

O/P Power

Eff. @115Vac

Eff. @230Vac