The voltage sensor reference design measures excessive AC voltages. It provides output in two kinds, works with completely different units, and helps engineers take a look at and construct sooner.
The ISO-AC-VSAO, a reference design from Vishay Intertechnology, focuses on correct voltage sensing for high-voltage AC methods. It makes use of the VIA0250DD isolation amplifier paired with a voltage divider manufactured from TNPV precision resistors. The circuit scales down excessive AC voltages, sometimes as much as 400 VRMS, and safely isolates the sensed sign earlier than changing it to an analog output. Two output sorts can be found: a differential output and a single-ended output, permitting flexibility in how the info is learn and processed.
The VIA0250DD helps a ±250 mV differential enter vary and produces an remoted differential sign with a 1.44 V common-mode voltage. This may be straight linked to a differential ADC or used for prototyping. The only-ended output, starting from 0 V to 2.5 V, is appropriate for connection to a single-ended ADC or a typical multimeter. The amplifier makes use of capacitive isolation, providing a most working isolation voltage of 1200 VRMS, important for protected and correct high-voltage measurement.
The TNPV e3 resistors within the voltage divider are thin-film, flat chip resistors designed for top reliability and voltage stability. Additionally included are ACAS 0606 AT and ACAS 0612 AT resistor arrays. These are automotive-grade, thin-film resistor networks with convex terminations, providing choices with equal or completely different resistance values. Their design ensures tight tolerance matching and temperature monitoring, important for sustaining a secure resistor ratio over time.
These options make the design extremely appropriate for functions the place electrical isolation and measurement accuracy are important. Using capacitive isolation permits quick, correct sign transmission with out interference. With a 300 kHz bandwidth, the amplifier is able to capturing high-frequency sign parts, making it helpful for quickly altering AC waveforms. The system’s low temperature drift and offset additional improve measurement consistency, even in variable environmental situations.
Design engineers can use this reference design as a ready-to-use constructing block for high-voltage measurement methods. It allows fast prototyping of remoted voltage sensing circuits, direct analysis of high-voltage AC alerts, and straightforward integration into ADC entrance ends for management or monitoring. Engineers can join the output on to improvement platforms or take a look at tools to validate system habits, measure sign efficiency, or develop new monitoring options for industrial and automotive use instances. It additionally helps them validate their very own resistor divider configurations or isolation amplifier decisions earlier than finalizing their system design.
The modular output configuration—each differential and single-ended—provides engineers the pliability to attach the sensor to varied kinds of information acquisition methods with no need exterior conversion or sign conditioning. Using resistor arrays and precision resistors additionally simplifies structure in compact PCBs, bettering efficiency and saving board area.
Vishay has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) structure, and extra. The corporate’s web site has further information in regards to the reference design. To learn extra about this reference design, click on right here.
