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應用場景
Application scenario

The new power system composed of photovoltaic power generation is an important part of achieving carbon peak and carbon neutrality, and it is bound to integrate with energy storage, promoting the development of integrated photovoltaic-storage-charging systems. With the rapid development of 800V new energy vehicles, fast charging piles will be integrated into the photovoltaic-storage-charging system in the future, forming a new power system or microgrid. On one hand, bidirectional charging and discharging at high voltage is a typical feature of the new photovoltaic-storage-charging system. Silicon carbide devices, by upgrading module power and energy conversion efficiency, will be widely used in super-fast charging infrastructure. On the other hand, new energy vehicles are the largest application scenario for silicon carbide power semiconductors. Silicon carbide, with its high voltage resistance, high temperature resistance, and high-frequency characteristics, is expected to rapidly replace silicon-based and IGBT in high-voltage systems, significantly improving vehicle performance and optimizing the overall vehicle architecture. In addition to charging piles and wireless charging, silicon carbide power semiconductors have multiple in-vehicle application scenarios, including motor controllers, onboard chargers (OBC), DC-DC converters, and air compressors.




Main drive controller
The battery, motor, and main drive controller are the three core components of new energy vehicles. The main drive controller is a DC to AC converter that can convert the DC power in the battery into three-phase AC power and deliver it to the motor. It is the heart of electric vehicles, determining driving behavior and vehicle energy efficiency. It is also the most widely used and valuable part of silicon carbide power devices. The application of silicon carbide as the main drive controller brings higher inverter efficiency, smaller system size, lower system cost, and longer driving range.
Car power supply
The 'New Energy Electric Vehicles'; Small Three Electric "; System (including on-board charger OBC, DC/DC converter DC/DC converter, and high-voltage distribution box PDU). Among them, the on-board charger (OBC) converts the AC power output from the AC charging station into DC power and delivers it to the power battery pack. The charging power range is from 3.3kW to 22KW, and it can support bidirectional flow; The DC-DC converter can convert the high voltage of 800V (400V) in the battery into a low voltage of 12V and deliver it to the low voltage system, with a power of approximately 2kW to 5kW.
OBC
As the interface between electric vehicles and the public power grid, the on-board charger (OBC) serves as a vehicle charger, OBC has important functions. It can convert alternating current from the power grid into direct current required for high-voltage batteries in electric vehicles to meet the charging needs of electric vehicle power batteries. At the same time, it can also invert the DC power of the power battery into AC power and feedback it to the power grid. The power semiconductor devices in OBC play a crucial role in achieving bidirectional energy conversion between automotive power batteries and the power grid.
DCDC
At present, the voltage of power batteries is generally between 200V and 400V, and many car companies are developing their power batteries towards 800V or even higher voltage. As a DC transformer, the DC/DC converter can convert the high voltage of the traction battery into low voltage, providing power to all low voltage electronic devices such as power steering, power windows, wiper control, instrument panel multifunction display, and other electronic control functions. Research has shown that SiC MOSFET is the most cost-effective choice for primary full bridge main switching devices in 800V battery systems.
air conditioning compressor
The electric compressor is a key component of the 800V high-voltage charging platform and the "heart" of vehicle thermal management. It not only supports cockpit thermal management, but also is responsible for the thermal management of the battery and drive system. As the vehicle platform shifts from 400V to 800V, the air conditioning compressor also needs to be matched with the high voltage platform of 800V. The traditional DC/DC+400V electric compressor solution is difficult to meet the cooling needs of power batteries under 800V high-power fast charging, and the energy loss is large, which greatly affects the ultimate energy replenishment experience of 800V high-voltage fast charging. On the entire 800V vehicle high-voltage platform, the electric compressor components adopt SiC technology, which can better solve the switch loss bottleneck caused by high voltage and high speed, thereby reducing the volume and weight of the compressor, lowering the noise of the compressor, and minimizing energy consumption to the greatest extent possible.
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Address：Fangzheng Microelectronics Industrial Park, No. 5 Baolong 7th Road, Longgang District, Shenzhen, Guangdong Province
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