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String inverter

Products and reference designs
Block diagram

String inverter

Block diagram

Overview

Our integrated circuits and reference designs help you accelerate development of solar string inverters, improving power density and efficiency while providing real-time communication and monitoring.

Design requirements

    String inverter designs require innovative technology to achieve:

  • Long-system lifespan.
  • Low-output distortion.
  • Accurate analog measurement of voltage and current.
  • High efficiency and power density.
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Block diagram

Find products and reference designs for your system.

Single phase string inverter

Three Phase String Inverter

Three Phase String Inverter

Grid connection Grid connection PV string input PV string input IO voltages IO voltages Internal rail Internal rail Isolated power (for Gate drivers) Isolated power(for Gate drivers) OR OR PV input for system power PV input for system power Grid input for system power Grid input for system power Input current & voltage sense Input current & voltage sense AMP AMP AMP AMP Current sensor Current sensor Current Current Voltage Voltage DC/DC power stage DC/DC power stage Temp sensor Temp sensor Gate drivers Gate drivers Boost converter Boost converter PWM PWM DC/AC power stage DC/AC power stage H-Bridge-, T-Type-, ANPC-, Flying cap-inverter H-Bridge-, T-Type-, ANPC-, Flying cap-inverter N N Gate driver Gate driver Gate driver Gate driver Gate driver Gate driver Temp sensor Tempsensor L1 L1 L2 L2 L3 L3 Output current & voltage sense Output current & voltage sense Current Current Voltage Voltage AMP AMP AMP AMP L1 L1 L2 L2 L3 L3 N N Current sensors Current sensors Relay control power stage Relay control power stage Relay driver Relay driver Relays Relays DC/DC logic DC/DC logic Gates & buffers Gates & buffers DC/AC logic DC/AC logic Gates & buffers Gates & buffers Self-diagnostics/monitoring Self-diagnostics/monitoring Arc fault detection Arc fault detection Insulation monitoring Insulation monitoring Analog front end Analog front end ADC ADC Reference Reference Optional Integrated in MCU OptionalIntegrated in MCU Digital processing Digital processing MCU MCU SVS SVS RTC RTC Signal isolation Signal isolation Data isolation Data isolation Optional Optional Wired interface Wired interface Ethernet Ethernet PLC PLC USB USB RS-485 RS-485 RS-232 RS-232 Wireless interface Wireless interface Wi-Fi Wi-Fi ZigBee ZigBee Sub-1 GHz Sub-1 GHz Bluetooth Bluetooth Output user interface Output user interface LED driver LED driver Low side isolated DC/DC power supply Low side isolated DC/DC power supply Isolated DC/DC Isolated DC/DC High side isolated DC/DC power supply High side isolated DC/DC power supply Isolated DC/DC Isolated DC/DC Isolated AC/DC power supply Isolated AC/DC power supply Isolated AC/DC Isolated AC/DC Non-isolated DC/DC power supply Non-isolated DC/DC power supply DC/DC DC/DC LDO LDO Bus current & voltage sense Bus current & voltage sense AMP AMP AMP AMP Current sensor Current sensor Current Current Voltage Voltage

Isolated AC/DC power supply

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For safety, redundancy, and simple operation reasons, solar inverters will typically be able to power themselves from either the solar array or the grid itself. Both of these supplies are used to generate an internal primary power rail, which other DC/DC converts can use. As such, both of the main converters needs to be capable to fully powering all of the electronics inside the system.

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Power management (5)
AC/DC & DC/DC controllers (external FET)
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  • LM5023—AC-DC quasi-Resonant current mode PWM controller
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  • UCC28740—Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)
    Data sheet: PDF | HTML
  • UCC28742—High-Efficiency Flyback Controller with 1% Output regulation accuracy
    Data sheet: PDF | HTML
  • UCC28700—Constant-voltage, constant-current PWM with PSR & Programmable cable compensation
    Data sheet: PDF | HTML
  • PMP10833—85-318Vin, 15Vout, 1Aout, AC-DC Buck Converter Reference Design
    Test report: PDF Schematic: PDF
  • PMP41031—350-V to 1500-V input, 150-W isolated auxiliary power reference design
    Test report: PDF | HTML Schematic: PDF
Application brief

Technical documentation

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Type Title Date
Application note Introduction to Photovoltaic Systems Maximum Power Point Tracking 29 Nov 2010
White paper Impact of an isolated gate driver (Rev. A) 28 Feb 2019
Application note Digitally Controlled HV Solar MPPT DC-DC Converter Using C2000 Piccolo MCU 23 Feb 2015
White paper Smart power opens door to more efficient electrical use 21 Mar 2016
White paper Four key design considerations when adding energy storage to solar power grids 19 Apr 2021
Application note Designing a Simple and Low-Cost Flybuck Solution With the TPS54308 (Rev. A) 18 Oct 2019
White paper Demystifying high-voltage power electronics for solar inverters 18 Jun 2018
White paper 為太陽能電網增添儲能功能的四項 重要設計考量 13 May 2021
Application note Comparative Analysis of Two Different Methods for Gate-Drive Current Boosting (Rev. A) PDF | HTML 11 May 2022
Application note Interfacing the C2000 with an AFE03x: B-FSK Example (Rev. D) PDF | HTML 11 May 2022
Application note Using a Single-Output Gate-Driver for High-Side or Low-Side Drive (Rev. B) PDF | HTML 08 Sep 2023
Application note Power Topology Considerations for Solar String Inverters and Energy Storage Systems (Rev. A) PDF | HTML 05 Dec 2024
More literature Smart Relays for Solar Inverters 03 May 2012
More literature Powering IGBT Drivers with Fly-Buck™ 03 Dec 2015
Technical article Stay ahead of the energy storage and solar game with bidirectional PFC and hybrid PDF | HTML 02 Aug 2023
Application brief Understanding Peak IOH and IOL Currents (Rev. A) 01 Apr 2020

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