Microinverters are often used as an alternative to string inverters to perform the DC to AC power conversion at solar panel level in residential photovoltaic systems. A solar micro inverter helps maximize energy yield and mitigate problems related to partial shading, dirt or single PV panel failures.
A microinverter is composed of a DC-DC converter implementing Maximum Power Point Tracking (MPPT) and a DC-AC inverter to shape current and voltage for injection into the AC grid. Data – including voltage, current and power generated - from all microinverters in the installation are collected and logged by a concentrator and then dispatched to a local or remote monitoring and control access point.
Our solutions and ICs for your microinverter design include power MOSFETs, high-voltage, galvanically isolated gate drivers and high-voltage silicon-carbide (SiC) diodes. Combined with high-performance STM32 microcontrollers, ST can provide a set of dedicated peripherals to help implement complex power conversion control algorithms. Energy metering ICs, wireless and wired connectivity solutions including multi-standard Power Line Communication (PLC) modems complete this portfolio.
Solar micro inverter block diagram
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ST MCU FINDER ST STM32 and STM8 product finder for mobile devices and desktops ST MOSFET Finder ST MOSFET product finder application for Android and iOS 
ST-DIODE-FINDER ST Diode product finder application for Android and iOS Part NumberSTM32 and STM8 product finder for mobile devices and desktops
MOSFET product finder application for Android and iOS
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MEMS and Sensors
Power Management
| Part number | Description |
|---|---|
| ALTAIR04-900 | Off-line all-primary-sensing switching regulator |
| ALTAIR05T-800 | Off-line all-primary-sensing switching regulator |
| L6985F | 38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current |
| L6986F | 38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current |
| L7985 | 2A step-down switching regulator |
| L7986 | 3A step-down switching regulator |
| L7987 | 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation |
| PM8834 | 4 A dual low side MOSFET driver |
| PM8841 | Single channel low-side gate driver |
| PM8851 | 1A Low Side Gate Driver with configurable asymmetric sink/source |
| ST1S40 | 3A DC step-down switching regulator |
| ST1S50 | 4A Monolithic synchronous step-down converter with high efficiency at light load |
| STGAP1AS | Automotive galvanically isolated single gate driver |
Power Transistors
| Part number | Description |
|---|---|
| STB80N20M5 | N-channel 200 V, 0.019 Ohm typ., 61 A MDmesh M5 Power MOSFET in D2PAK Package |
