AN3095 datasheet(30/55 Pages) STMICROELECTRONICS

Part #	AN3095

Description	The STEVAL-ISV002V2 demonstration board is the same

PDF	55 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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30 / 55 page

Schematic description

AN3095

30/55

Doc ID 16555 Rev 3

Figure 17.

Line current conditioning circuit

In this case the output voltage is given by:

Equation 53

Where: Vmeas is now the voltage output of the current sensor, having an offset of 2.5 V

generated by a TL431 configured as the voltage reference.

The same circuit in Figure 17 is used for the sensing of the DC bus voltage, PV array voltage

and PV array current.

In summary, the overall control architecture requires five feedback signals for correct

operation, input current and input voltage are used for maximum power point tracking;

inverter bus DC voltage, grid voltage and grid side current are used for grid-tied operation

and current injection. These signals are sent to the ADC inputs of the microcontroller,

according to the pin assignment of Figure 19 and sampled at 17.4 kHz (Figure 18).

Figure 18.

ADC interrupt service routine

⎟

⎠

⎞

⎜

⎝

⎛ +

⋅

meas

out

AN3095 Datasheet(PDF) 30 Page - STMicroelectronics