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What is E-Fuse?
E-Fuse is a device that uses a semiconductor switch to cut off overcurrent in the circuit.
E-Fuse shuts off the MOSFET and interrupts the circuit current when the circuit current exceeds a certain condition.
E-Fuse has the following features, such as high-speed breaking.
Major features
・No metal contacts
・No movable contacts
・Short shut-off time
・No arc discharge at shutdown
In recent electric vehicle applications, the number of circuits that handle high DC voltages due to the installation of high-voltage batteries is increasing, and along with this, circuit protection functions corresponding to this are becoming necessary. Breaking off DC voltage and current with mechanical contacts creates an arc between contacts, and there are issues such as the time it takes to actually cut off. In the future, E-Fuse switches that use SiC MOSFETs will be used. It is expected that the number of scenes will increase.
Reasons why high withstand voltage and high current are possible
High-voltage silicon power device MOSFETs and IGBTs are not suitable for high-voltage semiconductor switch applications because they cannot pass large currents due to loss during conduction. However, SiC MOSFETs are characterized by high voltage resistance and low on-resistance, and because losses during conduction can be suppressed, the use of SiC MOSFETs has made it possible to realize high voltage, high current E-Fuse applications. rice field.
Why Microchip Proposes E-Fuse
- Microchip's SiC products include a large lineup of MOSFETs, SBDs, and power modules.
- Microchip's SiC MOSFETs are avalanche and short circuit tolerant, offering excellent durability and reliability.
- Microchip has not only high voltage products but also various other products.
- Microchip has a demo board for E-Fuse functionality built around their own devices including SiC.
For this reason, Microchip proposes an E-Fuse solution with SiC MOSFETs.
E-Fuse circuit image
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