Auxiliary power supply devices are common in power applications for Battery Electrical Vehicles (BEV) and Hybrid Electrical Vehicles (HEV), as well as critical for provisioning power to a variety of reduced voltage subsystems, usually up to 20 V, such as control, communications, safety and security, motorists, etc. Additionally, the source of power for the materials themselves might be off a high voltage +400 V DC bus, like in On-Board Charging (OBC) systems, or the 48 V or 12 V battery voltage rails. With such a broad range of applications, the demands for complementary power materials are extremely diverse, spawning a myriad of alternative remedies and also implementations in the market.
Regardless of being the secondary systems, these supplies need to make certain high dependability as well as stability as they are provisioning power to critical blocks, such as the reasoning degree wiring, which may include the core controllers, or the gate motorists that are activating and also off the power MOSFETs (Metal Oxide Silicon Field Effect Transistors) as well as IGBTs (Insulated-Gate Bipolar Transistors). At the same time, small styles and an excellent price-performance proportion are necessary, as the system is not part of the core of the application and therefore need to take as couple of resources as feasible to finish the job. Safety is likewise vital, and also most of the times, the system needs to be certified with automobile standards, which additionally sets a limitation to the EMC discharges. As a bonus offer, the flexibility to adjust to a vast input voltage array as well as fit various use instances makes it stand out above others. Last but not least, the complementary power supplies need to offer high voltage isolation, specifically if mandated by the guidelines, or functional isolation for dependable operation.
Depending upon which of the requirements above matter for an application, the complementary products are carried out in different topologies – flyback, boost, buck-boost, and so on. They can feature different switching approaches, e.g. quasi-resonant or set regularity, as well as utilize integrated or discrete modern technologies to deliver the needed power. Figure 1. Schematic of an isolated complementary power supply based on a flyback geography as well as operating in quasi-resonant height current mode control. Figure 2. Effectiveness 40 W SECO − HVDCDC1362 − 15W15V − GEVB.
Figure 1. Schematic of an isolated complementary power supply based upon a flyback topology as well as operating in quasi-resonant top existing setting control.
ON Semiconductor just recently introduced 4 new remedies, the high voltage supporting power materials, suited for 800 V and also 400 V battery-based BEV and also PHEV and also supplying 15 W or 40 W, as well as the isolated products for IGBT and also SiC MOSFET chauffeurs. These services attend to the previously mentioned challenges as well as fulfill the required demands.
The SECO − HVDCDC1362 − 15W15V − GEVB as well as SECO − HVDCDC1362 − 40W15V − GEVB are highly efficient and also adaptable main − side controlled (PSR) complementary power products enhanced for BEV and also PHEV automotive drive train. These designs supply a steady 15 V over a wide input DC voltage variety from 250 V to 900 V, and also are consequently appropriate for 400 V as well as 800 V battery systems.
The services profit from the numerous benefits of the NCV1362 quasi − resonant top existing PSR flyback controller together with cost − optimized NVHL160N120SC1 160 mΩ 1200 V silicon carbide (SiC) MOSFET, as well as the FFSD0665B − F085 SiC diode. Thanks to the high blocking voltage capacities and ultra − reduced gateway cost (34 nC) value of the SiC FET, the changing losses are significantly diminished, and the layouts exhibit a superior efficiency for the application with up to 86% in low line problems. The exceptional driving abilities of the NCV1362 controller allows for straight procedure of the SiC FET at 12 V without a pre − driver, streamlining the format as well as cutting down the bill-of-materials content. The flyback transformer supplies 4 kV seclusion as well as is totally recognized with automotive-qualified semiconductors and also passive gadgets.
Figure 2. Effectiveness 40 W SECO − HVDCDC1362 − 15W15V − GEVB.
Figure 3. Block layout of SECO − HVDCDC1362 − 15W15V − GEVB.
Figure 4. Advantages of the high voltage supporting power supply 15 W (SECO − HVDCDC1362 − 15W15V − GEVB).
The SECO − LVDCDC3064 − IGBT − GEVB is an isolated supply for IGBT chauffeurs, giving the needed steady voltage rails (- 7.5 V as well as 15 V, and also 50 mA per branch) for effective changing over a broad input voltage range (6 Vdc to 18 Vdc). An extra a +7.5 V rail is as well provisioned to sustain any other reduced voltage logic. The system uses the NCV3064 DC-DC converter, which permits a portable as well as durable layout with a reduced bill-of-materials web content. The board is fully recognized with automotive-qualified components and also is pin-compatible with business IGBT DC/DC products, provisioning an out of package plug − in solutions for separated driver supplies. An added SiC variant using the very same NCV3064, the SECO − LVDCDC3064 − SIC-GEVB [1] will certainly be adapted for SiC MOSFET switching, provisioning + 20 V/ – 5V voltage rails for eviction vehicle drivers.
Figure 5. Benefits of the IGBT separated chauffeur supply 15 W (SECO-LVDCDC3064-IGBT − GEVB).
Figure 6. Block representation of SECO-LVDCDC3064-IGBT − GEVB.
The brand-new power supplies designs for 400 V as well as 800 V battery systems, and also isolated materials for IGBT as well as SiC gateway chauffeurs are particularly engineered for an uncomplicated assimilation right into application systems.
ON Semiconductor’s wide portfolio of products and also tools for vehicle complementary power options helps with meeting the requirements for each and every application and also supplying the ideal remedy. Along with our thorough profile of AC-DC controllers and regulators, DC-DC controllers and regulatory authorities, power MOSFETs, diodes as well as defense tools to completely recognize a broad spectrum of layouts, we help designers with a wide series of hardware and software assessment as well as growth tools, which can accelerate the advancement stages as well as reduce the time to market of new items.
Source: https://www.onsemi.com/blog/automotive/auxiliary-power-supply-solutions-for-vehicle-electrification
