Green silicon carbide belongs to a semiconductor material, so it is also widely used in power electronic devices, not only reducing the loss of electric energy, but also giving full play to its own advantages and overcoming many environmental problems.
Green silicon carbide power electronic devices will play an increasing role in improving the efficiency of power utilization and realizing the miniaturization of power electronic devices. Green silicon carbide power electronics can improve the efficiency of energy utilization to reduce power loss, because compared with silicon devices, green silicon carbide devices have advantages in reducing on-resistance and reducing switching losses.
For example, in the inverter circuit composed of diodes and switch tubes, only the diode material is replaced from silicon to green silicon carbide, the power loss of the inverter can be reduced by about 15~30%, and if the switch tube material is also replaced by SiC, then the power loss can be reduced by more than half. Power electronics made of silicon green carbide have three characteristics that enable miniaturization of power converters. Higher switching speeds, lower losses and higher operating temperatures.
Green silicon carbide devices can switch at several times the speed of silicon devices. The higher the switching frequency, the easier it is to miniaturize energy storage and filtering components such as inductors and capacitors; The reduction of electrical energy loss reduces the amount of heat generated, so that the miniaturization of power converters can be realized. In terms of junction temperature, silicon devices reach the limit at 200°C, while green silicon carbide devices can operate at higher junction temperatures and ambient temperatures, which can reduce or eliminate the cooling mechanism of power converters.
In addition to the application of green silicon carbide in power electronic devices, transmission systems, distribution systems, electric locomotives, hybrid vehicles, various industrial motors, photovoltaic inverters, wind power grid-connected inverters have its wide applications, and play their own advantages in various fields.
