[introduction] want to be able to be the batteries with electric older car efficiently to charge quickly, electric car ability gains ground in the market and develop. 2021, the average batteries capacity of before the rank on the market 12 electric car is 80 KW-hr. The car that consumer basically uses car in the home carries charger (OBC) undertakes charging. To ensure reasonable car charges time, OEM still increases the power size of OBC 11 KW from 6.6 KW, be as high as 22 KW even. When use 6.6 KW OBC, these electric cars need ability 12.1 hours to fill report. And after increasing OBC power 11 KW, charge time shortens to 7.3 hours, and when use 22 KW OBC, need 3.6 hours to be able to fill report only.

Inchoate electric car (because EV) stores enough energy comes hard drive is powerful advocate drive electric machinery, travel course of development is relatively finite. To lengthen travel course of development, electric car manufacturer increased the energy size of car batteries. However, bigger batteries is meant longer charge time.

Want to be able to be the batteries with electric older car efficiently to charge quickly, electric car ability gains ground in the market and develop. 2021, the average batteries capacity of before the rank on the market 12 electric car is 80 KW-hr. The car that consumer basically uses car in the home carries charger (OBC) undertakes charging. To ensure reasonable car charges time, OEM still increases the power size of OBC 11 KW from 6.6 KW, be as high as 22 KW even. When use 6.6 KW OBC, these electric cars need ability 12.1 hours to fill report. And after increasing OBC power 11 KW, charge time shortens to 7.3 hours, and when use 22 KW OBC, need 3.6 hours to be able to fill report only.

Those who need an attention is, dc charges quickly picket can be offerred about the power of 250 KW, the battery that needs 20 minutes to be able to be afore-mentioned capacities only fills report, and these charging the OBC that picket does not use car. However, according to the data of California energy commission, buy and install business to charge quickly with dc the average cost of picket exceeds 100 thousand dollar. On this price, dc charges quickly picket is only in industry and commercial application ability is significant, because same charge picket can be used by a lot of car. Current, consumer must rely on OBC to charge in the home, and shorten charge time is what enhance OBC power 6.6 KW above is main because of,move.

Two crucial factors that affect OBC design are voltage and switch frequency.

Batteries voltage is increasing 800 V from 400 V taller even, the energy size that taller batteries voltage can increase cell (X of voltage of energy capacity = is installed – when capacity) . For example, voltage double meeting makes batteries capacity (it is an unit with kilowatt hour) the travel mileage with car is double. Move to still can reduce the electricity that whole car place needs below taller voltage, reduce the cable cost between power source system, batteries and OBC thereby.

Switch frequency decided car place requires magnetic element (like inductor) dimension and weight. Through increasing switch frequency, can use smaller smaller magnetic cell, lesser component compares big component petty gain. As a result of lighter, they reduced a car to hold the mass of charger, make the engineer can be not being changed truckload below the circumstance of weight, weight adds in the other place of electric car. More compact dimension returns those who mean OBC system to enclose dimension smaller, be helpful for realizing fashionable car to design. Smaller enclose the possibility that still reduced OBC crust to become dangerous projectile in collision, increased security from this. In short, increase switch frequency to make design personnel to be able to realize higher power density inside smaller physical size.

Anyhow, taller voltage and taller switch frequency can increase the size of OBC significantly. Developing the challenge that personnel faces is, the component that they use must can bear taller voltage and taller switch frequency. Ask an attention, even if lower voltage is designed (namely 400 V) , OK still also the switch frequency with taller benefit from benefit from, in order to reduce the dimension of magnetic component and weight.

Carborundum supports taller switch frequency

Current framework of a few acting OBC uses MOSFET exceeding a written guarantee and IGBT component, however, these technologies suit the low pressure application that runs with inferior switch frequency. Specific and character, silicon radical is super the efficiency of knot MOSFET as voltage lift and reduce. Although be based on the parts of an apparatus of IGBT to be able to be used at taller voltage application, but the show that IGBT leaves in more high frequency rate not beautiful.

To offer faster charge speed, the new develop that the car carries charger to need a kind to be taller voltage and design of taller switch frequency only attacks structure. In addition, new develop attacks while the structure needs to providing higher power, simplify the design of system of integral power source. Carborundum of have the aid of (SiC) technology, this kind of new develop attacks the structure becomes a possibility.

Mix with MOSFET of traditional and super knot photograph of silicon radical IGBT is compared, the parts of an apparatus that is based on SiC and module have multinomial advantage. For example, normally the circumstance falls, as the addition of power, integral loss of the system also can increase, and the power source change-over circuit with be based on the MOSFET of SiC to make OEM can be founded in OBC system better. The result is OEM can rise ” from generate electricity drive ” integral efficiency, more important is, such efficiency carries below higher tension level.

Besides the travel course of development that lengthens electric car, make charge systematic efficiency is the biggest change, with dynamoelectric advance a system to keep consistent, still can reduce the cost that charges electric traffic. Accordingly, use SiC technology to improve OBC efficiency, can satisfy the requirement of consumer not only, answer competitive pressure, reduce the moving cost of electric car, the whole that still can raise electric car but durative. As electric car of 11 KW and 22 KW come out, siC technology will continue to aid force to rise efficiency and economic moving cost.

The power source system that is based on SiC can increase systematic efficiency and power density, among them because smaller passive cell has lower resistance,one part reason is, guide a loss is smaller. Accordingly, compare with super knot MOSFET and IGBT photograph, siC provided excellent hot performance, reduced power comsumption to the greastest extent, make systematic need opposite less medicinal powder hot.

For example, suppose an efficiency is the charger of 3.6 KW IGBT of 94% , this charger has the loss of 200 W. However, increase 11 KW as OBC rated power, the efficiency of 94% the loss translate into 660 W. The loss that generation exceeds 3 times can heat up systematic design to produce negative effect to coming loose, bring higher load to power source, reduce efficiency further.

The OBC that is based on SiC can achieve the efficiency of about 97% , specific depend on design. To the system of a 11 KW, this meeting is caused about the loss of 230 W, be equivalent to the loss that place of existing 3.6 KW system must answer. Accordingly, those who be used at system of 3.6 KW IGBT is existing medicinal powder the 11 KW system that is based on SiC can support like hot system. Change a means to compare, of the 11 KW system that is based on IGBT medicinal powder shrinkage fitting buy compares need the 11 KW system that is based on SiC to move often, consume additional power, pull low whole efficiency, bring about moving cost to increase.

Be based on the OBC design of SiC

Main component is the function that the car carries charger two phase.

The first phase is power factor corrective (PFC) , it is the initiative phase of AC/DC converter, it has 3 functions: alternating current changeover is dc, the input voltage promotion comes correct volts d.c. , and factor of generation unit power. Among them, the action of the 3rd function is to ensure electric current and voltage are inphase. The system that does not have factor of effective unit power can generate interference to electrified wire netting.

The 2nd main stage is to adjust charging DC/DC converter. Charge voltage is not constant, configure a file according to specific batteries however and change. This configuration file makes the engineer can be in efficiency, charge time and lengthen battery life respect to come true to charge well as far as possible experience.

On the tradition, class of PFC of 3.6 KW system uses bridge of commutate of a 4 diode to be alternating current changeover dc, it is the one or more photograph of step up converter next. Normally, this needs every look a MOSFET and commutator or two MOSFET.

Want to raise 11 KW from 3.6 KW, need is shunt-wound circuit of 3 3.6 KW (see a picture 1) . Want to achieve 22 KW, need is shunt-wound circuit of 6 3.6 KW. When use SiC, need fewer power parts of an apparatus to be able to achieve 11 KW or 22 KW only, simplified to whole is designed and achieve taller efficiency thereby.

Graph 1. Need of system of a 11 KW uses conventional pictures 3 times to attack 3.6 KW converter of the structure

Ansenmei (Onsemi) offers NVXK2KR80WDT, NVXK2TR80WDT and module of NVXK2TR40WXT 1200 V EliteSiC MOSFET, in the OBC application that can be used at electric car, in order to produce the advantage of SiC. These EliteSiC module can improve OBC design. NVXK2KR80WDT is module of commutator of a Vienna, compositive EliteSiC MOSFET of Ω of 1200 V 80 M, siC and Si diode are stuck outfit go up in substrate of Al2O3 pottery and porcelain. NVXK2TR80WDT is one two-piece bridge module, eliteSiC MOSFET of Ω of embarking 1200 V 80 M, stick outfit go up in substrate of Al2O3 pottery and porcelain. NVXK2TR40WXT is two-piece bridge module, eliteSiC MOSFET of Ω of embarking 1200 V 40 M, stick outfit go up in substrate of AlN pottery and porcelain, use at raising electric current to handle ability.

Graph all three-phase that how the 2 module that revealed these to be based on SiC offer course of 11 KW PFC through individual circuit, and the circuit that does not need 3 parallel connection, perhaps can use 3 NVXK2KR80WDT module to realize three-phase Vienna commutator, every module handles one appearance. To the 2nd class, DC/DC converter (two NVXK2TR80WDT module or two NVXK2TR40WXT module) the primary side that made CLLC syntonic converter and sub side bridge. This kind of develop attacks the structure can reduce whole yuan amount of parts of an apparatus improves efficiency, yuan parts of an apparatus decreased about 50% . 22 KW system also can apply this kind of develop to attack structure.

The engineer can use a series of module and not be discrete element will simplify design, ensure at the same time the compact design that has high power density. Module undertook conformity to the design of discrete element, reduce complexity, design and assemble the job what reduced OBC manufacturer thereby, offerred higher reliability at the same time.

Graph 2. Use carborundum module, need a circuit to be able to support all three-phase of 11 KW system only

Ansenmeidi offers extensive power parts of an apparatus to combine, can simplify the project offers different eclectic program, provide bigger flexibility for the engineer. For example, compare the RqJC of the 0.47 ° C/W at NVXK2xx40WXT, NVXK2xx80WDT has C/W of a 1.84 ° (every tile temperature rise) RqJC. Although the calorific volume of Xx80WDT is higher, but it is smaller than Xx40WXT, cheaper, of Xx40WXT medicinal powder hot performance is better. This makes develop personnel to be able to choose appropriate parts of an apparatus to marry the rated power of specific application, be in dimension / cost and medicinal powder balance has between heat.

Ask an attention, undertaking the RqJC of the RqJC of module and discrete element comparative is not man-to-man quite. This module has had embedded electric insulation layer, must add its in schism plan. In addition, schism is enclosed medium can have than component exterior heat up interface with interior, temperature rise should be gotten high than alone discrete element much.

Another element that wants a consideration is section plane. As a result of the likelihood compositive degree, the plan of clearance score vertical of module is close friends more. For example, IEC-60664-1 asks to be enclosed to the clearance of rare 5.0 Mm. Choice module can ensure contented clearance asks, the project simplifies to design in the meantime.

Laden balance

Filling electric field scene typically is a driver after next coming home, charge for electric car all night, as more and more electric car start off, a when power company is faced with main challenge will be laden balance requirement. Current, the intelligent electrified wire netting that the related side is undertaking study to be coordinated in order to found, include to undertake harmony in countrywide level and global level. For example, a kind of potential strategy is power company electric car cell is used in different spot in different time, maintain stability of electrified wire netting in order to help, the electric car that satisfies fastigium thereby charges demand.

These new develop that are based on SiC attack one of structural advantages are them it is two-way, and can support strategy of all sorts of harmonious intelligent electrified wire netting probably when introduce. Can put forward to have the new function that EV framework is competent hard in view of the code of ceaseless development, this kind of ability conduces to make the design that faces future.

Two-way OBC still makes electric car can fill husband to use lash-up dynamo. For example, after instantly heavy snow causes power failure, the family that has electric car can use electric car to wait for primary facility power supply for heater and floodlight, power supply quantity can amount to 60 kilowatt hour, specific depend on batteries capacity. As technical progress, electric car can act as in a variety of profession setting dynamo, provide electric power in out-of-the-way construction site for instance.

Ansenmei takes the lead in rolling out those who accord with car standard to be based on the power module of SiC, apply to a car to hold charger application. By right of SiC module of 15 years the quantity produces experience, ansenmei is offerring value and quality respect to have good outstanding achievement record and long history for the client.

Ansenmei also is one of SiC manufacturer that minority has complete conformity to supply chain. Grow to brilliant circle to make from SiC brilliant ingot, mix to module again schism parts of an apparatus, ansenmei has his interior to SiC is made and rig technological process, in order to ensure power parts of an apparatus accords with high quality standard. Ansenmei is the SiC supplier that carries end not only, and have outstanding operation ability and fast noise to answer ability.

Next generation cars carry charger to need to handle high pressure and the switch frequency that increase ceaselessly, in order to provide the efficiency that car manufacturer needs and power thickness. The develop with carborundum technology new support attacks structure, make power source engineer can satisfy these new requirements, reduce the dimension of OBC, weight, cost and complexity at the same time. Depend on combination of comprehensive power source product, the help quickens Ansenmeike OBC design, apply flexibility to develop personnel to offer, make a design that faces future, support new application in order to get used to the code of constant change.

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