[introduction]Batteries store can (ESS) solution besides application at industry, generate electricity besides, in domestic house part, also become current application and the key that the market grows. The power that ESS solution place of the residence needs is lesser, but the requirement to changeover efficiency and security, still apply with industry identical. The article will introduce the tendency of the market of residential ESS solution for you, and the function of the solution is characteristic related the SiC that Ai Rui electron and Rohm roll out.

Batteries store can (ESS) solution besides application at industry, generate electricity besides, in domestic house part, also become current application and the key that the market grows. The power that ESS solution place of the residence needs is lesser, but the requirement to changeover efficiency and security, still apply with industry identical. The article will introduce the tendency of the market of residential ESS solution for you, and the function of the solution is characteristic related the SiC that Ai Rui electron and Rohm roll out.

Can store and run the residential ESS application of electric energy

Residential ESS is solution of a kind of memory of the sources of energy that uses in the residence, aim to store and run electric energy, in order to improve energy use efficiency, reduce the sources of energy cost and increase the sources of energy to supply stability. Residential ESS application includes solar energy to generate electricity normally system (system of smooth hot season) , solar energy is smooth normally installation is in volt board housetop or other and proper place, sunshine changeover is dc electric energy.

ESS still needs to have fill electric controller to be in charge of monitoring solar energy to generate electricity systematic output, control electric energy to flow to store can system, it can ensure the electric energy memory that produces solar energy arrives in batteries. The core that batteries is ESS yuan parts of an apparatus, with the electric energy that at memory solar energy generates electricity by day, with in the late evening or the cloudy day supplies the sources of energy. At present common batteries technology includes lithium ion battery (Li-ion) with plumbic acerbity batteries.

ESS still needs inverter to will store the dc changeover in batteries is alternating current, use in order to supply the electric equipment in the family and lighting equipment, use energy management system (EMS) come the sources of energy of monitoring family uses the information such as circumstance, weather forecast and electrovalency, in order to optimize the use of the sources of energy and memory. It is OK automata charges and discharge process, in order to ensure benefit of first-rate the sources of energy.

Residential ESS still can receive electrified wire netting repeatedly, make the family can buy electric energy when need, or will redundant when energy resources is sufficient energy sells electrified wire netting, the ability that this kind of two-way energy sheds is called ” two-way and metric ” . Adopt supervisory system, domestic dweller is OK generation of the moving condition of system of the sources of energy of real time monitoring, energy and wear out condition, undertake operating adjustment through controlling a system remotely, change for example store can working mode of the system or set fill discharge time.

The framework of residential ESS can undertake adjustment according to specific requirement and technology, in order to ensure first-rate function and benefit. The autarky that this kind of system conduces to implementation the sources of energy, energy-saving decrease a platoon, offer when power cut of electrified wire netting reserve power source.

ESS application of the residence and industrial application differ somewhat on demand, the power that main difference depends on residential ESS place needing is inferior, general demand power is less than 10kW, must support two-way power changeover, use the AC/DC develop with efficient tall compatible and characteristic electromagnetism to attack mostly, and the DC/DC develop of efficient, high safe standards attacks, must support the line voltage of wide range mother of 360V – 550V, its batteries is placed normally in dc side, requirement system efficiency exceeds 90% , need to have reliable systematic stability, go after high power density, achieve the goal with small size, light weight, require cost of small system of beg to surrender, the demand that waits for character to installing compasses, EMC, noise is higher.

SiC photograph relatively have at silicon parts of an apparatus more the property performance of actor

To achieve afore-mentioned requirement, normally need uses carborundum (SiC) the changeover that will have power, because SiC parts of an apparatus has a few distinct advantages,this is, systematic efficiency can improve below big electric current and high temperature condition, the tenacity of tall electric field of SiC material makes SiC parts of an apparatus can reach more expensive voltage operation, have taller withstand voltage at silicon parts of an apparatus relatively, this makes SiC parts of an apparatus particularly useful in power changeover application.

In addition, the electron of SiC parts of an apparatus is migratory rate is older, this makes its are behaved in high frequency applying advantageous. Wait for application to high frequency transformer and power amplifier, siC parts of an apparatus provided better performance. The thermal conductance of SiC is 3 times of silicon parts of an apparatus, can realize smaller size and weight, in order to increase power density, optimize systematic cost, cost of its unit volume drops, energy can have two-way transition, and safe reliable, can achieve reduce 50% bulk and the goal that reduce cost of every watt unit, the bulk of parts of an apparatus that this means same power level to fall is smaller, weight is lighter.

SiC material is relatively stable on chemistry, to a few caustic material erode lesser. This makes the application that SiC parts of an apparatus issues in environment of a few extremes more applicable. Of SiC parts of an apparatus carry child floating rate is high, make its have rapidder switch rate. This to reducing switch loss, improve changeover efficiency, and improve trends of parts of an apparatus character is very good.

Use SiC store can plan can have smaller product size and weight, can realize taller switch frequency, and because use smaller magnetic parts of an apparatus, can use smaller transformer ／ inductor, its loss is smaller, medicinal powder hot effect is better, same power can be installed in smaller crust, compare with silicon IGBT photograph, the power density of SiC (W/Kg) increase one times, have high power density, can use simple two-way transformer develop attacks, control of its annulus road is fewer, have taller efficiency.

SiC parts of an apparatus has unit volume to guide electrify block is lower, guide a loss is small, nonexistent in involving a process electric current pulls end phenomenon, switch loss is small, and the refreshment of body diode loss is very small, can reduce content of stock detailed account (BOM) , systematic hard usage, reliability is higher.

It is with the design of side of DC-DC high pressure exemple, 1200V SiC and IGBT can be used when bus voltage 500V, driving voltage is 15V/-2.5V, switch frequency is 30kHz, circuit across can use 650V SiC and IGBT, driving voltage 15V/-2.5V, switch frequency 76kHz. The efficiency when high-pressured side circuit uses SiC parts of an apparatus is taller, siC power canal introduces 15V drive, and but compatible IGBT power runs program.

The design challenge of converter of two-way DC/DC power source and solution

The two-way DC/DC power source that is used at ESS in the design faces a lot of challenge when converter, resembling is to be below discharge mode, need to solve the problem of stress of low side MOS Vds that stable state works and carries a circumstance to fall for nothing, the solution is to be in transformer is primary increase inductance to 200 μ H, such one incoming telegram presses stress general to be able to be reduced 25% , efficiency raises 6%~7% .

In addition, need to solve in the problem of discharge mode, Vds voltage stress when starting, the solution uses PWM+PFM mixed control to inputting port, its voltage stress will can reduce 27% , when 80V Vmax is 124V. No less, below discharge mode, need to face syntonic capacitance unusual high temperature (96 ℃ @2100W) , right now but Mkp21224/400VDC of capacitance model instead, can reach syntonic capacitance thermal drop 65 ℃ @3000W.

On the other hand, below discharge mode, working frequency can change suddenly near 180kHz, gain trace is not smooth, can secure SRMOS right now guide dot tuning reachs a time frequency under 180 KHz, can maintain gain trace smooth.

SiC MOSFET product satisfies DC-DC design requirement

With Shenzhen power is diligent reference of DC-DC of two-way and high frequency segregation designs the 6600V 48V that electron and Ai Rui electron provide support for exemple, its are charging the part is supportable the dc generatrix of 380-480 VDC charges limits, shed 16A of ≦ of bus charging current continuously, output voltage is 40-60 VDC, output voltaic ≦ 140A, output power can amount to 6.6 KW most, charge efficiency can be amounted to when 420V 95% , coefficient of charging current ripple is 1% . 40-60 VDC is in the limits of batteries side voltage of discharge part, 140A of ≦ of batteries side electric current, limits of dc generatrix voltage is 380-480 VDC, output power can amount to 6.6 KW most, discharge efficiency can be amounted to when 54V 94% , coefficient of bus voltage ripple is 1% .

This referenced design falls in the circumstance that does not have Buck_Boost adjuster, the limits that low-pressure side works is 43V-57V, the working limits of full power is 49V-57V, electric current of the biggest stable output is 142A, the biggest short when output electric current is 150A (Vin = 420V, resistor is laden) . Below the case that has Buck_Boost regulator, the limits that low-pressure side works is 43V-57V, the working limits of full power is 49V-60V, electric current of the biggest stable output is 145A, the biggest short when output electric current is 150A (Vin = 420V, resistor is laden) . This SCT3030AR TO-247 that consults the design used 8 Rohm encloses SiC MOSFET, and BM61S41RFV-C grid driver and RJ1P12BBDTLL power MOSFET.

The SCT3030AR of Rohm is the SiC MOSFET that supports 650V Nch 4 to bring a foot to enclose, the SiC MOSFET of groove bar structure that dispute often applies to the server with efficient requirement to fill a power station to wait with inverter of power source, solar energy and electric car. Its use power source source pole makes foot and drive source pole brings a foot to depart 4 bring a foot to enclose, can utmost ground play gives performance of high speed switch, can improve significantly especially guide a loss, with before 3 bring a foot to enclose (TO-247N) photograph comparing, guide a loss and involve loss aggregate can reduce about 35% .

The SCT3030AR of Rohm is had low guide speed of electrify block, switch is fast and fast, retrorse restore, easily shunt-wound, drive is simple wait for character, use eletroplate without lead enclose, accord with RoHS standard, can apply extensively at power source of converter of solar energy inverter, DC/DC, switch, induction to heat to wait for a domain with electric machinery drive.

BM61S41RFV-C is driver of a grid, segregation voltage is 3750 Vrms, driving voltage of the biggest grid is 24V, i/O defer time most greatly 65 Ns, width of pulse of the smallest input is 60 Ns, output electric current is 4A, have owe press a lock to decide (UVLO) function and active rice strap clamp function, accord with AEC-Q100 standard, use SSOP-B10W to enclose. RJ1P12BBD is the power MOSFET of Nch 100V 120A, have low guide small model of electrify block, high power is enclosed, use eletroplate without lead enclose, accord with RoHS standard, without haloid check through UIS.

Epilogue

As green the sources of energy more and more be taken seriously by international society, also promoting the rapid development that residential ESS uses, among them drag in arrives electron of quite a few yuan parts of an apparatus and solution, representing giant market business chance. Ai Rui electron can assist a client to develop the DC-DC solution of ESS application, the SiC MOSFET of Rohm and relevant product can satisfy the applied requirement of DC-DC, if want to know more and detailed information, please direct with contact of Ai Rui electron.

Article origin: Ai Rui electron

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