Reinforced Isolated Phase Current Sense Reference Design with Small Delta Sigma Modulators
TIDA-00914
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Reinforced Isolated Phase Current Sense Ref Design With Small Delta-Sigma Mods (Rev. A)
(PDF 1855 KB)
20 Apr 2018
Description
This reference design realizes a reinforced isolated 3-phase inverter sub-system using isolated IGBT gate drivers and isolated current/voltage sensors. Precise in-line shunt based motor phase current sensing is done with AMC1306E25 delta sigma modulators. The modulator output is Manchester-encoded which simplifies the clock and data signal routing between the MCU and modulators. High CMTI of the modulator helps suppress the inverter switching noise transients from corrupting the data on the controller side. The small size of the modulator enables a compact solution. The TIDA-00914 provides an interface to connect to an external MCU or FPGA where digital SINC filters can be implemented to demodulate the AMC1306E25 output bitstream. This reference design uses the F28379D delfino control card which is connected to the reference design card through an adapter card to implement SINC filters for current sensing.
Features
- Simplified clock routing to delta sigma modulators due to Manchester-encoded data output
- Small pin count (8) enables compact solution
- High CMTI of modulator (>50 kV/us) improves noise immunity to switching transients
- Short circuit response time of less than 1.5 µs
- Calibrated full scale accuracy of <0.5% across temperature range of 0°C to 55°C
- Nominal phase current measurement range of 28 Arms and peak measurement range of +/-80 Apk
See the Important Notice and Disclaimer covering reference designs and other TI resources.
