High voltage switcher adds 1700 V SiC MOSFET
Power Integration has launched two high voltage switch chips for automotive battery packs using a 1700V silicon carbide (SiC) MOSFET.
“This is the first SiC device [from Power Integrations] with a 1700V SiC switch with the same controller so there is the same rectification and regulation a previous devices,” said Peter Vaughan, Director of Automotive Business Development.
The 1700V capability in the InnoSwirch3-AQ supports battery packs at 800V and 1000V where a 1200V device would not be able to handle the peak voltage that can come from regenerative braking.
The chip includes a built in 30V startup so there is no need for additional HV components such as a linear regulator for DC-DC supplies of 50W and 70W.
“The inverter has a large internal capacitance and there’s a requirement for starting and stopping or in a crash, that means the inverter has to discharge to less than 60V in under 2s, even on the failure on the 12V system,” said Vaughan. “The 30V operation is to guarantee the control electronics stays alive to discharge the capacitance, starting at 40 to 45V in the specification.”
The highly integrated InnoSwitch ICs reduce the number of components required to implement a power supply by as much as 50 percent, saving significant circuit-board space, enhancing system reliability and mitigating component sourcing challenges.
The devices use a compact InSOP-24D package with a a FluxLink feedback link, providing reinforced isolation up to 5000m for secondary-side control. FluxLink enables direct sensing of the output voltage, providing benefits such as accurate regulation and extremely fast transient response.
The inclusion of synchronous rectification and a quasi-resonant (QR) / CCM flyback controller achieves greater than 90 percent and consume less than 15 mW at no-load for reducing self-discharge in battery management systems.
The InnoSwitch3-AQ parts are also suitable for industrial markets, where the integrated solution replaces discrete controller-plus-MOSFET designs, saving space, time and cost while increasing reliability in applications such as renewables, industrial motor drives, battery storage and metering.
Availability
A reference design, DER-913Q, and hardware kit RDK-919Q, are available and the devices are priced at $5.64 for part number INN3947CQ-TL and $9.02 for part number INN3949CQ-TL in volume quantities.
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