Recently, President Xi Jinping attended the Leaders' Summit of the fifteenth meeting of the Conference of the Parties to the Convention on Biological Diversity (COP15) by video and delivered a keynote speech, stating that China will build a “1+N” policy system of carbon peaking and carbon neutrality. China's announcement that it will strive to peak carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060 means that China is actively participating in the global decarbonisation race.
For the automotive industry
The automotive industry, as a key contributor to achieving carbon neutrality, has been subject to increased emission standards. In the face of stringent emission regulations, major automotive companies are actively seeking ways to reduce emissions; and due to various factors, new energy vehicles or hybrid models such as HEVs and PHEVs are unable to completely replace the presence of traditional fuel vehicles. At this time, in the face of harsh emission standards, major automotive companies urgently need to find a way to reduce fuel consumption and CO2 without giving up traditional fuel vehicles, which have a high share of the market, and at the same time effectively reduce both.
For the traditional 12V system, if you want to achieve 10KW ~ 20KW of light hybrid, it means that the battery may need to output up to 1000A of current, which is obviously not feasible. In this regard, the 48V light hybrid system has become a technological breakthrough.
The 48V mild hybrid system offers better fuel efficiency and greater functionality, with the overall advantages reflected in the fact that it helps to reduce overall fuel consumption and environmental hazards; supports higher-powered on-board equipment with greater versatility; and improves the efficiency of the engine, with a high energy recovery rate.
Bidirectional Lift Voltage Converter
The standard 48V system consists of three main components: a motor, a lithium-ion battery pack, and a DC-DC converter. 48V systems can be viewed as an upgraded version of the 12V system, expanding on the 12V system to handle higher loads, and can be efficiently coupled to these systems using a lift-off converter.
One of the core components of the 48V mild hybrid system technology is a powerful buck-boost converter that allows energy to flow in both directions between two different voltage levels.
During normal operation, the converter mode is buck, which outputs the power generated by the 48V system to the 12V system; in this operating state, VD2 is in the disconnected state, while VD1 works in the closed state. On the contrary, when 48V output is needed, the converter switches to boost mode; in this case, VD1 is in the on state, while VD2 works in pulse mode. The specific working mode is shown below:
Power inductors are needed for energy storage and choke during the boost and buck operation of bi-directional boost/buck converters. At the same time, the power inductors used need to meet more stringent technical specifications, with high current, low loss characteristics and high reliability, in compliance with automotive regulations. As a professional inductor manufacturer with more than 20 years of experience in developing and manufacturing high-performance automotive-grade magnetic components, Corteca has launched the VSRU27 series of automotive-grade, high-current, low-loss power inductors for this type of DC-DC converter.
Codaca Electronics Automotive Grade Power Inductors VSRU27 Series
The high current power inductor VSRU27 series features ultra-low DC resistance, ranging from 0.46 ~ 1.92 mΩ; operating temperature range of -55°C ~ +150°C (including coil heat); and small size, high operating current, low loss, and effective power conversion efficiency. The inductance range is 1.0µH~15µH, and the saturation current is up to 23 A~101.5 A at 25°C. The inductance range is 1.0µH~15µH.
Compact design with a PCB footprint of 27.8 x 25.8 mm2; low-back design with heights ranging from 11.9 mm to 16.9 mm, depending on model;
Meanwhile, VSRU27 series adopts flat coil winding, which effectively reduces the DC resistance of the product and improves the space utilisation of the winding; meanwhile, it adopts symmetrical air gap design, which effectively improves the saturation current of the product, realises high power and low temperature rise, and reduces the product's loss to the minimum. The bottom electrode adopts flat wire winding to lead out directly, which effectively reduces the risk of open-circuit; at the same time, the third welding terminal is added to improve the inductor's mechanical stability and anti-vibration capability.
In addition, the VSRU27 series is RoHS compliant and has passed the AEC-Q200 reliability test.
In addition to the standard VSRU27, Codaca Electronics will follow up with VSRU16, VSRU19, VSRU24 series to provide more model options, please look forward to it!