How to design in SiC MOSFETs to improve EV traction inverter efficiency
insulation of 2000 volt speak , 100 kilovolts/millisecond (kV/ms) common-mode rejection, and a 50 megabit per second (Mbit/s) data throughput. Offâchip ceramic capacitors form the isolation barrier as shown in Figure 6. The digital signals are transmitted across the isolation barrier using an ON-OFF keying
(OOK) modulation. On the transmitter side, the V IN input logic state is modulated with a high-frequency carrier signal. The resulting signal is amplified and transmitted to the isolation barrier. The receiver side detects the barrier signal and demodulates it using an envelope detection technique (Figure 7). The output signal determines the
V O output logic state when the output enable control EN is high. V O defaults to a high-impedance low state when the transmitter power supply is off, or V IN input is disconnected.
Figure 6: Block diagram illustrating a single channel of the NCID9211R2 digital isolator. Off-chip capacitors form the isolation barrier. (Image source: ON Semiconductor)
Figure 7: The NCID9211 digital isolator uses OOK modulation to transmit digital information across the isolation barrier. (Image source: ON Semiconductor)
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