Microwave ovens convert electricity into longer-wavelength electromagnetic waves, called microwaves, which are emitted inside a tightly sealed metal box. Two of the most common household appliances are microwave ovens and WiFi routers, both of which emit electromagnetic radiation to function microwave ovens emit microwaves to heat food, while WiFi routers emit radio waves. You may remember the following chart of the electromagnetic spectrum from your high school science class.Īs mentioned earlier, many everyday appliances rely on electromagnetic waves to function. Gamma rays and X-rays have high frequencies and therefore high energies, while radio waves and microwaves are on the other side of the band as they have lower frequencies. Likewise, many other things, including mobile phones, television remote controls, microwave ovens, WiFi, work via electromagnetic radiation.Įlectromagnetic radiation comes in different forms depending on the frequency. Visible light, something that permeates everything around us, is a form of electromagnetic radiation. The output side of the isolated gate drivers require a supply (typically 15 to 30 Vdc for IGBTs) that is isolated from the low-voltage domain and can be provided by the built-in dc-dc converter in the Si828x driver family.We are basically constantly surrounded by electromagnetic radiation. The gate drive for these switches uses isolated gate drivers, such as Si8239x, Si823x, Si823Hx, Si827x., and Si828x. Isolation separates the controller domain from the high-voltage ac domain. The traction inverter function is accomplished using six switches: one high-side and one low-side switch for each phase.
The CAN bus is isolated with digital isolators like Si86xx and digital isolators with integrated dc-dc power converters like Si88xx. The entire system can be monitored and controlled via an automotive bus such as CAN (“Comm” in the diagram below). Traction inverters are typically capable of transferring power in the 20 to 100 kW range, with switching voltages in the 200 V to 800 V range and currents in the hundreds of amperes. Why Isolation is Critical in Traction InvertersĮlectric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) require a traction inverter to convert dc energy from the high-voltage battery or dc link bus to the three-phase ac energy used to drive the traction motor.
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