Allegro | Current Sensing for Power Delivery | Arrow
Hall-based solutions have the benefit of inherent galvanic isolation and working voltages up to >1000 V, so they can be used in AC and DC high-voltage applications without
Isolated current sense amplifier solutions are typically limited to 300 kHz while Hall solutions can reach up to 1 Mhz. Electronic circuits run on a wide range of DC voltages, hence the need for DC-to-DC conversion either on the AC/DC output or for systems with multiple DC rails.
For inverters without a transformer or with a high-frequency transformer, sensors must exhibit low offset drift with temperature (high accuracy) so as to control the DC component in the AC current fed to the grid.
First, a DC / DC converter is used both to convert the voltage from the panel or array to something close to the grid voltage, as well as to maximize the power extracted from the panels. Then, an inverter is used to convert from DC to AC and sync it up with the grid.
The advent of the Smart Grid, Plug-in Hybrid Electric Vehicles (PHEV), and full Battery Electric Vehicles (BEV), as well as grid-tied photovoltaic (PV) and other grid-tied renewable energy systems, requires development of high-efficiency power inverters. Usually, higher efficiency is associated with higher application cost and reduced performance.
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