preface
Microinverter is an inverter that converts solar cell power into alternating current, connecting the solar panel to the input of the inverter, and the output of the inverter can be connected in parallel with other inverters, or directly connected to the grid for grid-connected power generation, which is very suitable for low-power solar cell inverter use.
The charging head network has summarized a batch of disassembled solar inverters, which are all sealed plastic or aluminum alloy shells, filled with thermal conductive glue inside the housing, improve heat dissipation performance, reduce temperature rise, and also have excellent weather resistance to support outdoor use. Let's take a look at the internal design of these micro solar inverters through the summary article.
APsystems
Yuneng 250W photovoltaic grid-connected microinverter
The YC240 PV grid-connected microinverter is designed with a rubber shell, with IP67 protection level, and supports -40~65°C working temperature to meet outdoor applications. The maximum output power of the inverter is 250W and the output voltage is 220V. The maximum DC input voltage is 44V and the maximum input current is 12A.
Through dismantling, the charging head network learned that the YC240 inverter of Yuneng Technology adopts the potting process, which is an aluminum alloy shielding shell inside the rubber shell, which is fixed by screws, and the PCB and the aluminum alloy shielding shell are sealed and fixed with glue to improve the heat dissipation performance and increase the strength. A separate control board is welded to the side of the inverter, and three custom chips are used inside for control. A communication module is also soldered on the small board for wireless connection control.
The input is boosted by an Infineon MOS transistor, the output is modulated by an ST MOS transistor, and a Cree silicon carbide diode is built in for rectification. The DC input and boost output of the inverter are filtered by film capacitors, which are more heat-resistant and have a longer life than electrolytic capacitors, and can meet the needs of long-term high-temperature environment applications.
Related Reading:
1. Dismantling report: Yuneng 250W photovoltaic grid-connected microinverter
Yuneng 250W photovoltaic grid-connected microinverter
The YC250A PV grid-connected inverter adopts a metal shell, has IP65 protection level, and supports -40~65°C working temperature to meet outdoor applications. The maximum output power of the inverter is 250W and the output voltage is 220V. The maximum input voltage of DC is 55V, supports 22-45V maximum power tracking, and the maximum input current is 12A.
Through dismantling, the charging head network learned that the YC250A inverter of Yuneng Technology adopts a potting process to improve the heat dissipation performance, and the internal PCBA module is fixed inside the aluminum alloy shell by screws. The DC input of the inverter is filtered by Chemi-Con electrolytic capacitors, boosted by Infineon's BSC190N15NS3-G MOS, rectified by CREE C4D02120E silicon carbide diodes at the boost output, and modulated by MOS transistors and thyristors.
Internally, Silicon Lab MCU and Lattice LFE2-12SE-5TN144C programmable gate array chip are used for the whole machine control, and the auxiliary power supply adopts the NCP1377 main control chip, and the Risecom power line communication chip is also used to communicate with the host. The internal materials are reliable in workmanship and can meet the operation of outdoor harsh environments.
DARFON
Darfon 600W PV grid-connected microinverter
The G64C grid-connected microinverter adopts an aluminum alloy shell, has IP67 protection level, and supports -40~65°C working temperature to meet outdoor applications. The inverter has two DC inputs with an output voltage of 220V and a maximum output power of 600W. The inverter has a maximum DC input voltage of 60V, supports 26-45V power tracking, and the maximum input current is 14A.
Through the dismantling of the charging head network, it was learned that the photovoltaic grid-connected microinverter of Darfon Electronics adopts the architecture of optimizer + inverter, and the two inputs are inverter inputs after being stepped-down through the synchronous step-down circuit. The inverter is controlled internally by the solantro digital power chipset, with the SA4011 mixed-signal chip and SA1002 driver for inverter boost control, in addition to four drivers for buck and output modulation control.
The inverter uses Texas Instruments MOS transistors for step-down conversion, Toshiba MOS transistors for inverter boosting, output rectification uses Renegen fast recovery diodes, and output modulation uses STMicroelectronics MOS transistors. The input filter capacitor is from Chemi-Con, the PCB is coated with conformal coating, and a thermal pad is pasted, and the back is coated with thermal conductive glue to enhance heat dissipation. The internal workmanship materials are reliable, which can meet the long-term operation in the harsh outdoor environment.
ENPHASE ENERGY
ENPHASE ENERGY IQ7+微型逆变器
Solar power generation has gradually entered our lives, the current solar panels have been able to provide hundreds of watts of output power, and support folding storage, easy to use, output support for outdoor power charging, to meet the needs of ordinary users. ENPHASE is a microinverter that supports the use of solar cell power supply, inverting into 220Vac output and grid-connected output, which transmits the solar inverter to the grid and reduces the load on the grid.
Through the disassembly, the charging head network learned that this microinverter of ENPHASE is designed for outdoor applications, with a plastic shell and an internal rubber potting seal, which has excellent weather resistance.
Thermally conductive gel and heat sink are used to enhance heat dissipation at the position of the power tube corresponding to the internal PCB. The inverter adopts a customized main control chip inside, the MPS driver is used for boosting with onsemi switch tube, and the modulation is made of Infineon isolation driver and switch tube, all of which are made of first-line brands and potting process to meet the use of outdoor harsh environments.
Related Reading:
1、拆解报告：ENPHASE ENERGY IQ7+ 微型逆变器
ENPHASE ENERGY IQ8X微型逆变器
ENPHASE's microinverters have a rich product line, not only with the IQ7 series solar inverter for grid-connected power generation, but also the IQ8 off-grid inverter for battery energy storage applications, the inverter is configured through power line communication to set a number of parameters such as output voltage, among which IQ8 can be inverted output in the event of a power failure to meet the energy storage power supply demand.
Through the disassembly, the charging head network learned that the ENPHASE microinverter is a modular design, with a thick plastic shell, internal glue sealing, and excellent weather resistance.
Thermally conductive gel and heat sink are used to enhance heat dissipation at the position of the power tube corresponding to the internal PCB. The inverter adopts a customized main control chip inside, an MPS driver with AOS switch for boosting, and a Texas Instruments isolation driver and Infineon switch for modulation.
Related Reading:
1、拆解报告：ENPHASE ENERGY IQ8X 微型逆变器
ENPHASE ENERGY 215W微型逆变器
ENPHASE ENERGY M215 PHOTOVOLTAIC GRID-CONNECTED MICROINVERTER ADOPTS ALUMINUM ALLOY SHELL, NATURAL CONVECTION HEAT DISSIPATION, IP67 protection level, supports -40°C~65°C, and meets outdoor use. The maximum output power of the inverter is 215W and the output voltage is 230Vac. The maximum DC input voltage is 45V, supports 22-36V power tracking, and the maximum short-circuit current is 15A.
Through the dismantling of the charging head network, it was learned that the PCBA module inside the inverter of ENPHASE ENERGY is fixed inside the aluminum alloy shell, and the input of the inverter solar cell is filtered by Chemi-Con electrolytic capacitors, and the voltage is boosted by Infineon MOS transistors, and the STMicroelectronics MOS transistors are used for output modulation. ENPHASE's own chips are used for internal control, and the internal materials are all first-line brands to ensure stable and reliable operation for a long time.
hoymiles禾迈
Hoymiles 250W microinverter
With a maximum output power of 250W, the Hoymiles solar microinverter is available with a set of DC inputs and a set of AC input and output terminals. The inverter adopts an all-aluminum alloy shell to enhance heat dissipation performance and reduce the temperature rise during operation. The inverter housing is fixed with screws, which is easy to assemble and maintain, and improves the serviceability of the product.
Through the dismantling of the charging head network, it was learned that the inverter of Hoymiles was filled with thermal conductive glue inside the shell to improve the heat dissipation performance. The DC input of the inverter is filtered by Chemi-Con electrolytic capacitors, boosted using Infineon's BSC190N15NS3-G MOS, and driven by a Texas Instruments UCC27524 half-bridge driver.
The inverter uses Texas Instruments C2000 series real-time microcontroller TMS320F28027PTT for complete control, and the boost output is rectified by CREE C4D02120E silicon carbide diode, and the output is modulated by MOS transistor and thyristor. The inverter is also equipped with a wireless communication module for communication, and the overall materials are all first-line brands to meet the operation of outdoor harsh environments.
Related Reading:
1、拆解报告:HoMiles禾迈微型逆变器mi-250
Hoymiles 700W microinverter
This solar microinverter from Hoymiles supports two DC inputs and one AC output with an AC output power of 700W and a built-in wireless module for inverter communication. The inverter is made of an all-aluminum alloy housing and is screwed in place, making it very robust. The all-aluminum alloy shell can improve the heat dissipation capacity of the inverter and reduce the working temperature rise.
Through the dismantling of the charging head network, it is learned that this inverter is filled with thermal conductive glue inside the shell to improve heat dissipation performance. Internally, TI Texas Instruments TMS320F28035 C2000 series MCU is used for inverter control, and UCC27524 is used for step-up MOS tube drive. Internally, four transformers are used for two inputs, and the boost MOS transistor is from Infineon, model BSC190N15NS3-G.
The transformer output is rectified by four CREE C4D02120 1200V silicon carbide diodes, the modulation signal is isolated by optocoupler, and the signal is shaped using onsemi MC74HC14A to drive Infineon SPB17N80C3 and two thyristors for output modulation. The internal input electrolytic capacitors are from Chemi-Con, and the output filtering and protection devices are from EPCOS. The materials used in the inverter are all first-line brands, and they are potted with thermally conductive adhesive to improve the heat dissipation capacity and meet the use of high-temperature environments.
Related Reading:
1、拆解报告:HoMiles禾迈微型逆变器mi-700
TENTEK Tianji New Energy
Tianji New Energy 1200W Microinverter
The microinverter launched by Tianji New Energy has two DC inputs and one AC output, with a continuous output power of 1200W and a peak output power of 3600W. The inverter adopts an all-aluminum alloy sealed shell with IP67 protection capability. The inverter has built-in WiFi communication function, which supports web monitoring and APP remote monitoring.
Through the dismantling of the charging head network, it was learned that the microinverter of Tianji New Energy was filled with thermal conductive glue inside the shell and pasted with a thermal pad to improve the heat dissipation performance. Texas Instruments F280023PNSR C2000 series MCU is used for internal control, and Morui MD18624 is used to drive the booster MOS tube, which is from Hengtaike, model HGP195N15S.
The output of the transformer is rectified by four basic semiconductors B1D04065E silicon carbide diodes, the output modulation signal is isolated by the transformer and driven by Rongpai Pai8211C, the output modulation IGBT adopts China Resources Micro CRG40T60AN3H and basic semiconductor BGH50N65ZF1, and the output current detection chip adopts Xinjin Electronics CC6924. The internal materials of the inverter are all first-line brands, and the interior is filled with thermally conductive adhesive, which is combined with the aluminum alloy shell to improve the heat dissipation capacity and meet the needs of passive heat dissipation.
Related Reading:
1. Dismantling report: Tianji New Energy 1200W microinverter
Summary of the charging head network
Micro solar inverters are based on the same principle as common inverters, both use a transformer for voltage boosting, and a modulation circuit output. Compared with traditional inverters, micro solar inverters are equipped with multiple protection components at the output end, which can effectively prevent accidental surge overvoltage from damaging the internal components of the inverter and improve the reliability of the product.
Due to the long working time of the microinverter and the fact that it is mostly set up in an outdoor environment, in order to avoid maintenance costs, the microinverter does not use a fan for heat dissipation, but adopts the design of thermal conductive adhesive potting to make full use of the heat dissipation of the shell. ENPHASE's microinverter uses a plastic shell, but the aluminum plate is still used inside the housing to dissipate heat from the PCB, increasing the heat dissipation area and speeding up heat dissipation.