ST MicroelectronicsSolar Reference Designs

Available from

Avnet Electronics Marketing

www.avnetexpress.com

Semiconductor reference designs for solar

Improved performance and efficiency

Part Number: STEVAL-ISV002V1

PV PANEL

OverviewSpecification Value

DC-DC input voltage 200 V – 400 V

DC-DC output voltage 450 V

DC-AC output voltage 230 Vac

Nominal output power 3 kW

DC/AC switching frequency 17 kHz

DC/DC switching frequency 35 kHz

Transformer turn ratio 1.22

Transformer magnetizing inductance

2.1 mH

Transformer leakage inductance

35 µH

Max average input current @ 200 V

16.1 A

Primary switch peak current 36.3 A

Auxiliary SMPS

DC-AC

DC-DCAnti-islanding

MPPT

Control board

High efficiency>95%

DC-DC converter based on phase-shift FB control of primary and secondary switches by MPPT algorithm

DC-AC converter based on current mode PWM control for grid connection by DC bus voltage control

3 kW converter for grid-connected PV systems

System architecture: main components

DC array voltageSTW55NM60ND

Gate

driver

L6386

High-voltagehalf-bridge drivers

Programmable dead time

Gate

driver

DC

V

olt

ag

e

Gate

driver

L6386

PV

Gate

driver

TD350

M1 M3

M2 M4

M5

M6

Grid

STW55NM60ND

HF transformerLlk

1:n Lf

Lf

Gate

driver

TD350

Vin

= 2

00

-40

0 V

Fs = 35 kHz Fs = 17 kHz

Pout = 3 kWVbus = 450 V

STTH60L06W

STGW35NC60WD

Z1

Z2

Z3

Z4

STM32

3 kW converter for grid-connected PV systems

3 kW converter for grid-connected PV systems

DC-DC converter power transfer

Tested Efficiency @ 300V Input

0.95

0.955

0.96

0.965

0.97

0.975

0.98

0.985

0.99

0 500 1000 1500 2000 2500

Output Power

Eff

icie

nc

y

STP42N65M5 STW55NM60N

1 KW Inverter Specifications

Key products: STP160N75F3 TGW20NC60WD SG3525

Part Number: STEVAL-ISV001V1

Nominal input voltage: 24 V Output voltage: 230 Vrms, 50 Hz Output power: 1 kW Efficiency: 92% Switching frequency: DC-DC: 100 kHz DC-AC: 15 kHz

Vin

Step-up stage (push-pull)

SG3525

+

STP160N75F3

STH8R06

L6386

L6386

ST7Flite39

STGW20NC60WD

+

_

Vout

Inverter stage

++15V

+5VL7805

L5973

1N5821

STN4NF03L

PowerSupplySection

1 KW Inverter Block Diagram

1 KW Inverter