Hybrid vehicles face new challenges in power management
The two main trends of "green" vehicles that enhance energy efficiency and reduce gas emissions, enhance protection and improve safety function levels are driving the development of a new generation of vehicles. Obviously, a car with a green design is not necessarily a hybrid electric vehicle (HEV). In fact, there are many traditional technologies that can make cars more in line with environmental protection requirements, help to improve fuel efficiency and reduce gas emissions, such as direct fuel injection, variable valve control, cylinder fuel economy, turbocharged engines, lubricated engines, etc.
From the perspective of energy saving, we see "green cars" of different designs and styles. Some of them allow consumers to meet their needs with less budget. The start-stop function is an energy-saving function at a reasonable price. This function allows the internal combustion engine to automatically suspend operation when the car encounters a red light or is in a traffic jam. European OEMs have regarded this feature as a standard feature of their mainstream platforms. The additional cost of the entire start / stop function is only $ 300, but it can save 3% to 10% of fuel, and the effect is very significant. If the car is driving in a city with very heavy traffic, it can even save up to 25% of fuel. Since the start / stop function can be run on a standard 12V power network without expensive higher voltage systems or extra energy storage batteries required for light and full hybrid vehicles (HEV), this design becomes the main feature Cost advantage.
Of course, for many people, HEV is equivalent to the green car of the future, but we must note that HEV has many different designs in development, including a miniature with a pure start / stop function through an integrated starter AC engine (ISA) HEVs, full HEVs and plug-in HEVs that continue to increase the energy efficiency of pure electric driving have a wide variety of designs. Since the light, comprehensive and plug-in HEV requires high-voltage electronic systems between 600V and 1,200V, this makes the design more challenging. In order to provide sufficient electric engine power to electric engine vehicles, or to provide sufficient support for internal combustion engines, some large engine drives are required, and these large engines were only used in the industrial world before, and are now gradually entering automotive applications. In addition, it is necessary to integrate the electric power system and other new electronic systems into the new HEV vehicle architecture.
The new electronic system includes a DC / DC converter that can realize energy transmission between 12V and high-voltage power grids, as well as many electronic drive systems such as air conditioning and power steering systems. This is a challenge for the automotive engineering and semiconductor fields, because people used to work in a 12V battery environment, but now they suddenly face the dangers caused by high-voltage electronics, so these dangerous electronic systems must be Safely isolate.
In addition, HEV's high-voltage architecture also requires the deployment of additional peripheral systems and energy and battery management units. Therefore, we must develop reliable, advanced driver ICs and switches in the field of power management to meet the challenges of the automotive environment. Its efficiency and cost-effectiveness must ensure that the technology of the entire design concept is practical and feasible, and the price will not exceed the user's acceptable range. . IR's power management semiconductors can support all of the above requirements, but the main challenge facing HEV is the technology of the battery itself.
Today, batteries including new lithium-ion batteries have technical limitations and shortcomings. For example, they can only walk a limited distance between two storages; long charging time; and the high cost of the battery, the huge Volume and weight. While global battery manufacturers strive to improve the electrochemical technology of the battery itself, we believe that through intelligent electronic battery management solutions, we can promote the continuous improvement of the battery to extend the life of the battery, provide better performance, and reduce costs, volume and weight.
Green design and HEV bring new challenges to power management in the automotive industry. International Rectifier (IR) has an absolute advantage in this regard. IR has a long experience in industrial engine drive power management, making us a unique automotive semiconductor supplier. IR can provide high voltage power switches such as high voltage driver ICs and IGBTs. Today, we have a first-class engine-driven product camp, and we plan to launch more than 200 new automotive products specifically designed for harsh automotive environments within the next 12 months. Take our engine control IC as an example, this IC has integrated a variety of safety functions to prevent catastrophic failure in the event of a short circuit in the power engine. In addition, the latest DirectFET product line for bondless automobiles not only brings very low on-resistance to the design of DC / DC converters and battery management systems, but also eliminates the need for bonding wires, which enables very fast Under switching conditions, the parasitic inductance can basically reach zero, while having first-class EMI performance.
IR's automotive business unit has five product lines, including high-voltage driver ICs, smart power ICs, smart switches, MOSFETs, and high-voltage IGBT switches for low, medium, and up to 1,200V. IR can provide a comprehensive chipset solution for almost all power management applications found in a modern HEV.
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