EMC. The LT8609S synchronous step-down regulator works within the system to provide an efficient and very stable voltage source for the control electronics. The LTC4368 provides over- and under-voltage as well as reverse current protection for the LT8390 while the MAX17613 does the same for the LT8609S and the low power control electronics. The vehicle power management system, utilising multiple MAX253 and ADuM4221 devices to switch banks of power transistors, responds dynamically to loads and avoids going to a float voltage. “When designing new, cutting-edge systems,
it’s nice to have a partner like ADI. Their high performance products and power expertise make them an excellent partner,” said Joe Agrelo, senior electrical engineer at IOXUS.
Figure 3. An animated rendering of the electronics inside the uSTART Smart Power ultracapacitor.
(EMI) adds to the challenge, as automotive environments add tremendous noise to system voltages, where both positive and negative voltage transients can be multiple times the battery voltage. Another design challenge is meeting stringent electromagnetic compatibility (EMC) emissions requirements for vehicle original equipment manufacturers (OEMs) across wide bands of radio spectra. Further, the chemistry and material connections require keen attention to source and sink power smoothly without unwanted resistance. IOXUS’
portfolio features multiple patents on the chemistry of both electrodes and ultracapacitor. IOXUS partnered with Analog Devices to develop the power management system. The primary functions include charge management of the ultracapacitor, protection, isolation, and system management. The LT8390 buck-boost controller manages the amount and timing of current to efficiently charge the ultracapacitor from zero volts up to its charge set point. It also features spread spectrum frequency modulation to reduce associated system radio frequency emissions for
CONCLUSION Products like the IOXUS uSTART ultracapacitor improve system performance and reduce energy consumption. The uSTART ultracapacitor takes on the difficult challenge of constant motor starts and stops, including the associated fuel consumption and component wear, and solves it with an elegant product that also improves performance. Demand for mobility will grow in the coming years, requiring new solutions like the IOXUS uSTART ultracapacitor.
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bit.ly/3yd8OK2 KONE-130x190.indd 1 28/02/2024 14:36 29
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