STEVAL-ISV003V1 250 W microinverter for plug-in PV panels demonstration board Data brief Features ■ Input voltage range from 18 V to 45 V ■ Output voltage range from 110 V to 240 V AC, 50/60 Hz ■ Grid connection algorithm and MPPT capability ■ Digital control section managed by the STM32 ■ Reactive power management ■ RS-232 for communication ■ RoHS compliant Description The STEVAL-ISV003V1 is a demonstration board which implements the microinverter concept and is designed to optimize the power production of each single solar panel by means of DC/AC conversion. The conversion system is capable of both grid synchronization and Maximum Power Point Tracking (MPPT) thanks to the use of an advanced control algorithm implemented in the 32-bit STM32 microcontroller. The MPPT function is based on the perturb and observe (P & O) concept which seeks the best operating point of the panel, thus maximizing the energy produced under any environmental condition. The grid synchronization algorithm has the advantage over standard solutions of a decoupled control of active and reactive power. The STEVALISV003V1 demonstration board uses a highfrequency (HF) isolated DC/DC converter with interleaved current and an optimized full-bridge DC/AC inverter. The typical solar panel voltage is first stepped up to about 400 V and then converted into AC to create a sinusoidal output. STEVAL-ISV003V1 In open-loop mode the sinusoidal reference is created internally by means of a standard lookup table, while in closed-loop mode, a sinusoidal voltage feedback, proportional to the grid voltage, is used. The system can be connected to either a 50 Hz or 60 Hz network, depending on local requirements. Finally, the RS-232 interface can be used for serial data transfer of specified voltage, current and current signals. An LED display provides a user-friendly interface for the end user which allows monitoring and/or modifying some of the main operating parameters. Two modes of operation are available and can be selected to allow either open-loop operation or closed-loop operation in synchronization with the grid. October 2011 Doc ID 022334 Rev 2 For further information contact your local STMicroelectronics sales office. 1/12 www.st.com 12 2/12 VINPUT Doc ID 022334 Rev 2 10 mOhm 1W 1% R22 I_SENS_PV 1uF, 100V 1uF, 100V C28 1uF, 100V C27 1uF, 100V C26 1uF, 100V C25 1uF, 100V C24 1uF, 100V C22 1uF, 100V C23 1uF, 100V C21 1uF, 100V C20 1uF, 100V C19 1uF, 100V C18 1uF, 100V C17 1uF, 100V C16 C15 D22 R18 10k 1% VIN_SENS_PV D24 Schottky Gate 1 R10 150k 1% Magnetica 800uH 4A R8 R12 27/0.25W 2.7/0.25W L6 INDUCTOR Magnetica 800uH 4A Q7 D23 Schottky STH180N10F3-2 Gate 2 D21 R9 27/0.25W 2.7/0.25W R7 STH180N10F3-2 Q5 12 9 D42 STPSC806G 3 2 10 7 1 T3 TRAFO FUNCTIONAL ISOLATION 6 5 4 C12 2.2uF, 250V 2.2uF, 630V C7 C13 2.2uF, 250V C8 22uF, 450V C9 22uF,450V C10 22uF, 450V 100k 1% R6 C11 22uF, 450V High f PWM Low Side 1 Vbus_SENS R3 15M 1% High f PWM High Side 1 D16 27/0.25W R4 3.3/0.25W D14 D17 27/0.25W R20 HIGH FREQUENCY R1 3.3/0.25W D9 SENS LEG1 OUT AC 1 R11 0.02/0.5W Q3 STB42N65M5 D8 STPS3L40S Q1 STB42N65M5 D6 STPS3L40S D34 STPSC606 Low f PW M Low Side 2 6A 600V Low f PW M High Side 2 STPSC606 D11 R5 3.3/0.25W D15 27/0.25W R21 27/0.25W R23 SENS LEG2 LOW FREQUENCY 3.3/0.25W R2 D10 R14 0.02/0.5W Q4 STB42N65M5 OUT AC 2 Q2 STB42N65M5 Figure 1. J1 CON_PV L4 INDUCTOR D40 STPSC806G R19 DRAIN MOSFET HIGH 2 1 2 1 DRAIN MOSFET HIGH 1 Schematics STEVAL-ISV003V1 Schematics Isolated interleaved boost converter AM10192V1 STEVAL-ISV003V1 Figure 2. Schematics Power supply section - 15 V U1 5 3 Vcc Osc C138 220nF C136 2.7nF Boot Vfb 6 1 2.7nF C78 10nF C80 1 D31 STPS3L60U R42 56.2K, 1% L4971 C83 220uF, 25V PANASONIC EEEFC1E221P C139 100nF C77 100nF R39 24k 120pF Vcc15V L15 2 SS/INH GND 7 Comp C135 4 OUT 8 R38 20k 2 VINPUT PANASONIC EEEFK1J151AQ C137 150uF,63V Coilcraft MSS1278-224 R40 16K, 1% AM10193V1 Figure 3. Power supply section - 5 V U2 5 3 Vcc Osc C146 220nF C145 2.7nF C143 120pF C140 100nF R75 24k 1 Boot Vfb C142 10nF 6 1 C141 2.7nF 8 GND Comp C147 150uF,63V Vcc5V L17 2 7 OUT SS/INH R71 20k 2 VINPUT PANASONIC EEEFK1J151AQ Coilcraft MSS1278-224 4 L4971 D32 STPS3L60U R78 2.7K, 1% C144 220uF, 25V PANASONIC EEEFC1E221P C148 100nF R77 4.7K, 1% AM10193V1 Figure 4. DC/DC drive selection IC3 R44 PWM1 3.3 ohm R46 1 2 3 4 ENB1 PWM1 GND PWM2 ENB2 OUT1 VCC OUT2 8 7 6 5 Gate 1 Gate 2 PWM2 3.3 ohm PM8834 C60 Vcc15V 10u 25V LOW SIDE MOSFET DRIVER Doc ID 022334 Rev 2 AM10194V1 3/12 Vbus_SENS 86.6k 1% R128 3 2 8 - + Doc ID 022334 Rev 2 4 TS272 1 U13A2 C69 100n 50V 1k 1% C71 100n 50V R129 120 R130 Q10 2STN2340 3 4 1 2 HCNR200-300 LED K LED A PD2 K PD2 A PD1 K PD1 A NC NC U21 7 8 6 5 3 2 TS272 1 U13A3 3V3 C74 150p 25V 59k 1% R131 8 + 4/12 4 C76 100n 50V ADC_BUS_VOLTAGE Figure 5. - 5Visol Schematics STEVAL-ISV003V1 V-bus sensing AM10196v1 STEVAL-ISV003V1 Figure 6. Schematics 5 V isolated DCDC L5 NMV1505SAC Vcc 15V 5V 0 1 5Visol Gnd Vcc15V 2 5 7 C56 100n 25V C55 100n 15V C53 1u 25V AM10197V1 Figure 7. PV voltage sensing section R100 1k 5Vcc C84 100n IC11 ADC_PANEL_VOLTAGE 1 2 3 4 OUT1 Vcc+ In1- OUT2 In1+ In2- Vcc- In2+ 8 R101 10k 0.1% 7 R102 10k 0.1% 6 5 R103 3.3k 1% TSV992 VIN_SENS_PV C85 10n AM10198V1 Doc ID 022334 Rev 2 5/12 6/12 C8 22uF, 450V C9 22uF,450V C10 22uF, 450V Doc ID 022334 Rev 2 100k 1% R6 C11 22uF, 450V High f PWM Low Side 1 Vbus_SENS R3 15M 1% High f PWM High Side 1 D16 27/0.25W R19 R4 3.3/0.25W D14 D17 27/0.25W R20 HIGH FREQUENCY R1 3.3/0.25W D9 SENS LEG1 OUT AC 1 R11 0.02/0.5W Q3 STB42N65M5 D8 STPS3L40S Q1 STB42N65M5 D34 STPSC606 Low f PW M Low Side 2 6A 600V Low f PW M High Side 2 STPSC606 D11 R5 3.3/0.25W D15 27/0.25W R21 27/0.25W R23 SENS LEG2 LOW FREQUENCY 3.3/0.25W R2 D10 R14 0.02/0.5W Q4 STB42N65M5 OUT AC 2 Q2 STB42N65M5 DRAIN MOSFET HIGH 2 Figure 8. D6 STPS3L40S DRAIN MOSFET HIGH 1 Schematics STEVAL-ISV003V1 DC/AC topology: mixed-frequency inverter AM10199V1 Doc ID 022334 Rev 2 C36 10uF 25V RELAY _GRID R27 470 330 R36 AC_NEUT R29 10k 1% Q9 2N7002 OUT AC 1 G5LE-1A4-DC12 3 1 D29 STPS2L25U 2 5 RL1 OUT AC 2 R28 5.6 2W C31 470nF, 275VAC Magnetica 2196.0001 C34 2.2n, 300VAC EARTH GROUND N.C. R26 C29 2.2n, 300VAC T1 10mH Coilcraf t BU10-6003R0BL 4 1 L14 3 2 C33 2.2n, 300VAC N.C. C30 2.2n, 300VAC R25 1 1 2 2 I- Magnetica 2196.0001 L13 I+ SC3 TMOV14R140E SC1 TMOV14R140E FUSE 2A F1 1 2 SC2 V150LA20A CON GRID J2 NEUTRAL_sens 1 2 L1_sens Figure 9. Vcc15V STEVAL-ISV003V1 Schematics Output AC line filter AM10200V1 7/12 Schematics STEVAL-ISV003V1 Figure 10. Output current sensor 5Vcc IC1 Vs(+) 5 I+ 4 I- PRI Iin GND (-) OUT 1 2 C35 100n 3 PRI Iout HONEY WELL CSLW6B5 R30 Iout_sens 1k 1% C37 22n AM10201V1 Figure 11. AC line current sensing R88 10K 5Vcc R90 R92 10K 0.1% 100nF 4k7 0.1% IC9 1 2 Iout_sens AC LINE CURRENT SENSOR 3 4 OUT1 Vcc+ In1- OUT2 In1+ In2- Vcc- In2+ 8 C79 R94 560 7 AC_Line current 6 5 R96 1.1k TSV992 AM10202V1 8/12 Doc ID 022334 Rev 2 NEUTRAL_sens L1_sens T2 6 7 PULSE 020-5384.0 4 1 19.4V R79 10k,1% 10k, 1% R72 C70 1nF, 50V 180k, 1% R73 Doc ID 022334 Rev 2 R86 20k,1% R84 20k,1% 5Vcc R76 6.81k, 1% 10uF, 25V C68 2 TS272 1 U13A1 C75 10nF, 16V 3 4 + - 8 5Vcc 6.81k, 1% R69 C67 100nF, 16V 1k, 1% R74 C72 100nF, 16V AC_Line v oltage STEVAL-ISV003V1 Schematics Figure 12. VOUT sensing section AM10203V1 9/12 105 0 3 2 1 CON3 J13 3 2 1 3V3 GND R104 10k J14 3 2 1 3V3 C91 10pF GND PB13 PWM3 PWM2 PB1 TX_0 RX_0 TDO/SWO TRST GND GND R107 10k RESET 3V3 C93 8Mhz 22pF C92 22pF PC5 PC6 PC7 PC8 PC9 A0_DAC A1_DAC PC12 PC13 LDAC (DAC) SY NC (DAC) ENABLE (DAC) PB5 PB5 PB6 USART1_TX PB7 USART1_RX TIM4_CH3_LEG1 10k R118 Y2 390 R115 180p 180p180p180p180p GNDGNDGNDGNDGND C113C114C115C116C117 180p GNDGNDGNDGNDGNDGND 3V3 180p NRST OSC_OUT OSC_IN BOOT0 NOT CONNECTED 180p180p180p180p 3V3 25 24 23 138 106 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 PC8 PC9 PC10 PC11 PC12 PC13-ANTI_TAMP PC14-OSC32_IN PC15-OSC32_OUT PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PB8 PB9 PB10 PB11 PB12 PB13 PB14 PB15 PA0-WKUP PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA8 PA9 PA10 PA11 PA12 PA13 PA14 PA15 C101C102C103C104C105C106 180p GND C94 OSCOUT OSCIN ADC123_IN10 ADC123_IN11 ADC123_IN12 ADC123_IN13 ADC12_IN14 RESET# PC12 PC13 ADC12_IN15 TIM8_CH1 TIM8_CH2 TIM8 CH3 TIM8 CH4 PC0 PC1 PC2 PC3 PC4 26 27 28 29 44 45 96 97 98 99 111 112 113 7 8 9 46 47 48 133 134 135 136 137 139 140 69 70 73 74 75 76 PB0 TIM3_CH3 PB1 TIM8_CH3N PB2 BOOT1 PA13 JTAG PA14 JTAG PA15 JTAG PA10 PA7 SPI1_MOSI TIM1_CH1_LEG2 34 35 36 37 40 41 42 43 100 101 102 103 104 105 109 110 PA0 TIM2_CH1 PA1 RELAY -GRID PB10 LDAC (DAC) PB11 SY NC (DAC) PB12 ENABLE (DAC) TIM1_CH1N PA2 TIM5_CH3 PA3 TIM5_CH4 TMS/SWDIO TCK/SWCLK TDI PA10 PWM4 PWM1 AC_Line current AC_Line v oltage ADC_PANEL_CURRENT ADC_PANEL_VOLTAGE ADC_BUS_VOLTAGE PC5 PC6 PC7 PC8 PC9 R106 0 PC15 OSC32_OUT GND 1 JUMPER_3 C90 10pF 2 GND 3V3 GND Y1 32.768Khz 472-0887 PC14 OSC32_IN JUMPER_3 J12 SCLK (DAC) DATA IN (DAC) PA2 PA3 1 2 RELAY _GRID VSS_1 VSS_2 VSS_3 VSS_4 VSS_5 VSS_6 VSS_7 VSS_8 VSS_9 VSS_10 VSS_11 GND 3V3 STM32F103ZET6 GND C120C121C122C123C124 100nF 100nF 100nF 100nF 100nF 3V3 GND C107C108C109C110C111C112 100nF 100nF 100nF 100nF 100nF 100nF 71 107 143 38 16 51 61 83 94 120 130 VDD_1 VDD_2 VDD_3 VDD_4 VDD_5 VDD_6 VDD_7 VDD_8 VDD_9 VDD_10 VDD_11 3V3 VDDA 131 121 95 84 62 52 17 39 144 108 72 GND C118 10nF VDD_A 33 VSS_A GND GND 30 Doc ID 022334 Rev 2 VREF- VREF+ L16 3V3 R121 47 C119 10uF BLM41PG600SN1L GND 31 10/12 32 VBAT GND C98 10nF 3V3 PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 PE15 PE14 PE13 PE12 PE11 PE10 PE9 PE8 PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0 PF15 PF14 PF13 PF12 PF11 PF10 PF9 PF8 PF7 PF6 PF5 PF4 PF3 PF2 PF1 PF0 PG15 PG14 PG13 PG12 PG11 PG10 PG9 PG8 PG7 PG6 PG5 PG4 PG3 PG2 PG1 PG0 86 85 82 81 80 79 78 77 123 122 119 118 117 116 115 114 68 67 66 65 64 63 60 59 58 5 4 3 2 1 142 141 55 54 53 50 49 22 21 20 19 18 15 14 13 12 11 10 132 129 128 127 126 125 124 93 92 91 90 89 88 87 57 56 FSMC_NWE FSMC_NOE KEY -DOWN PD1 PD0 D3 D2 D15 D14 D13 PD10 PD9 PD8 D12 D11 D10 D9 D8 D7 D6 D5 D4 D[0..15] D1 D0 PE3 PE2 PE1 PE0 A0 USER_BUTTON KEY -CENTER KEY -UP KEY -LEFT KEY -RIGHT FSMC_NE4 PD15 PD14 PE7 PF0 PG0 PD5 FSMC-NWE PD4 FSMC-NOE PD3 KEY -DOWN PE3 PE2 PE1 PE0 PG0 PG8 USER-BUTTON PG7 KEY -CENTER PG15 KEY -UP PG14 KEY -LEFT PG13 KEY -RIGHT PG12 FSMC_NE4 - 6 U20 Schematics STEVAL-ISV003V1 Figure 13. 32 bit MCU-STM32F electrical schematic - AM10204V1 STEVAL-ISV003V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 07-Oct-2011 1 Initial release. 11-Oct-2011 2 Minor text changes on cover page. Doc ID 022334 Rev 2 11/12 STEVAL-ISV003V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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