Performances of an Interleaved High Step-Up Converter with Different Soft-Switching Snubbers for PV Energy Conversion Applications

Table 3

Parameter values of the boost converter with single-capacitor snubber under full-load condition.

Parameters	Formulas	Calculation values	Practical values
𝐼𝐷𝐵	(𝑁+1)𝐼𝑂−𝑉2(1−𝐷)𝐿^PV1𝐷𝑇𝑆	38.87 A	39.5 A
𝐼𝐷𝑃	(𝑁+1)𝐼𝑂+𝑉2(1−𝐷)𝐿^PV1𝐷𝑇𝑆	54.47 A	56 A
𝐼𝐷𝐶	(𝑁+1)𝐼𝑂+2(1−𝐷)𝐷𝑉𝑂𝑇𝑆𝐿1−(𝑉𝑂−𝑉PV)𝑇𝑆2𝐿1	12 A	63 A
Switch stress 𝑉𝐷𝑆(max)	𝑁𝑉PV+𝑉𝑂𝑁+1	53 V	55 V
Voltage across snubber capacitor 𝑉𝐶𝑆	(𝑉𝑂+𝑁𝑉PV)	1120 V	1120 V
Output diode stress	(𝑉𝑂+𝑁𝑉PV)	1120 V	1500 V
Duty ratio 𝐷	𝑉𝑂−𝑉PV𝑁𝑉PV+𝑉𝑂	0.325	0.34
Snubber capacitor 𝐶𝑆	𝐶𝑆≥𝑡𝑠off(𝑁𝑉PV+𝑉𝑂)(𝑁+1)(𝑉𝑂+𝑁𝑉PV)^2𝐼𝐷𝑃	1.16 nF	10 nF
𝑇𝐶𝐶	𝐶𝑆𝑉𝐷𝑆(max)𝐼𝐷𝐵+𝐼𝐷𝐶	1.2 ns	9.9 ns
Switching loss of each switch at turn-on 𝑃𝑠on	12𝑇𝑆𝑉𝐷𝑆(max)(𝐼𝐷𝐵+𝐼𝐷𝐶)𝑡𝑠on	5.86 W	21.14 W
Switching loss of each switch at turn-off 𝑃𝑠off		0 W	0 W
Conduction loss of each switch 𝑃SC	13𝑇𝑆(𝐼^2𝐷𝑃+𝐼𝐷𝑃𝐼𝐷𝐵+𝐼^2𝐷𝐵)𝑅ds𝑡on	28.58 W	30.31 W
Conduction loss of diode 𝑃SCD	𝑉DF𝐼𝑂1(av)=12𝑉DF𝐼𝑂	7.2 W	7.5 W
Forward drop voltage 𝑉DF of output diode		4.8 V; (2.4 V × 2)	4.8 V; (2.4 V × 2)
𝑡𝑠on		87 ns	150 ns
𝑡𝑠off		103 ns; (𝑃𝑠on calculation)	500 ns; (𝐶𝑆 calculation)
𝑉PV		36 V	36 V
𝑉𝑂		400 V	400 V
𝑇𝑆		20 μs	20 μs
𝐼𝑂		3 A	3 A
𝑁		20	20
𝑡on	𝐷𝑇𝑆	6.5 μs	6.8 μs
𝑅ds		0.04 Ω	0.04 Ω