In response to these needs, Texas Instruments offers several isolation offerings for solar power conversion applications. These include isolated IGBT gate drivers, digital isolators, isolated delta-sigma ADCs and amplifiers, and isolated communication links such as isolated RS-485 and isolated CAN.
In a solar power converter, high-voltage and low-voltage circuits co-exist. Isolations are required between the high-voltage and low-voltage circuits for both functional and safety purposes. Fundamental isolation concepts and terminology are presented in references [3-4]. Digital isolators can be used to address the isolation requirements.
In a solar power conversion system, different types of isolators are adopted to serve various functions. Isolated gate drivers are used to drive insulated gate bipolar transistors (IGBTs) or metal-oxide semiconductor field-effect transistors (MOSFETs) in the high-voltage power stage.
For solar power conversion systems with galvanic isolation between the grid-tied circuits and PV circuits (Figure 3), the impulse voltage rating of the grid-tied circuits and PV circuits are determined in the previous two bullets. The isolation transformer between the PV circuits and grid-tied circuits can reduce the OVC.
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However, inclusion of the isolation transformer brings extra power loss and accounts for further board space, which means more cost. The isolation requirements of the PV circuits and grid
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