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AN3095 Datasheet(PDF) 4 Page - 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
Logo STMICROELECTRONICS - STMicroelectronics

AN3095 Datasheet(HTML) 4 Page - STMicroelectronics

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 4 / 55 page
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List of figures
AN3095
4/55
Doc ID 16555 Rev 3
List of figures
Figure 1.
3 kW PV system image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Block scheme of hardware implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3.
DC-DC and DC-AC converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
DC-DC converter control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5.
DC-DC converter equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6.
Current flow in mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7.
Current flow in mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8.
Current path in mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9.
DC-DC converter operating waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 10.
Modulation and transformer current in DCM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11.
Power transfer function for different input voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 12.
Variation of parameter “d” with input voltage for n=1.2. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 13.
Conversion systems with modified DC-AC inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 14.
Schematic of the power stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 15.
Output sensing and relay board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 16.
Schematic of the AC voltage measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17.
Line current conditioning circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18.
ADC interrupt service routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 19.
STM32F103xx microcontroller schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 20.
DC-DC converter driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 21.
DC-AC converter driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 22.
5 V,1 A flyback converter with VIPER17HN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 23.
Multi-output flyback converter with VIPER27HN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 24.
Block diagram of the implemented control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 25.
Stationary reference frame and rotating reference frame . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 26.
Implemented PLL structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 27.
DQ components of the current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 28.
Block diagram of the implemented MPPT algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 29.
Grid angle and Vd component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 30.
Grid angle and grid voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 31.
Grid angle (yellow), grid voltage (red), 90° phase-shifted voltage (blue) . . . . . . . . . . . . . . 46
Figure 32.
DC-DC phase-shift modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 33.
Phase-shifted signals, transformer current in CCM, power MOSFET M1 drain current . . . 47
Figure 34.
Power MOSFET M1- Ch1 gate signal; Ch2 drain-source voltage and drain current Ch4. . 47
Figure 35.
Phase-shifted gate signals (Ch1, Ch2), primary and secondary transformer voltage
(Ch3, Ch4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 36.
DC-AC voltage and current in standalone mode (open-loop operation) . . . . . . . . . . . . . . . 48
Figure 37.
Grid voltage (blue), inverter voltage (red), injected current (green); injected power (math
function) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 38.
Inverter voltage (green) and current (blue) at 800 W,PF=0.97 . . . . . . . . . . . . . . . . . . . . . . 48
Figure 39.
Inverter voltage (green) and current (yellow) at 2500 W, PF . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 40.
DC-DC converter efficiency at different input voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 41.
System efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 42.
MOSFET M1- Ch1 gate signal, Ch2 drain-source voltage and Ch 4 drain current. . . . . . . 49
Figure 43.
Phase-shifted gate signals (Ch1, Ch2), primary and secondary transformer voltage (Ch3,
Ch4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49



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