Looking Closer at DC Link Capacitors in Electric Vehicles

时间： 2024-07-09 来源：Knowles Official Website

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DC link capacitors,capacitor,MLCCs,film electrolytic capacitors

DC link capacitors are commonly used in power converters as an intermediary buffer between an input source to an output load that have different instantaneous power, voltages, and frequencies. In electric vehicle (EV) applications, DC link capacitors help offset the effects of inductance in inverters, motor controllers, and battery systems. They also serve as filters that protect EV subsystems from voltage spikes, surges, and electromagnetic interference (EMI).

Figure 1. Common uses for DC link capacitors in power conversion systems (source: Center of Reliable Power Electronics)

Take a look at the on-board charger (OBC) in Figure 2, which is responsible for charging the traction battery. Inside the OBC resides:

The AC/DC converter that converts alternating current (AC) from electric grid into direct current (DC) using rectification and Power Factor Correction (PFC)

An intermediate DC link circuit for energy buffering

The next stage DC/DC converter that adjusts the produced DC voltage to provide correct DC levels to the battery.

The DC link capacitor Cbulk is placed between the rectifier and DC/DC converter. Desired characteristics for the capacitor include:

High DC voltage rating: 300V to 500V

Very large capacitance: 200µF to 1500µF

Operating temperature range: -40℃ to +250℃

Low equivalent series resistance (ESR): < 1.5mΩ

High root mean square (RMS) current capacity

High mechanical ruggedness

To meet the large capacitance values, multiple capacitors or a capacitor array is required. We recommend using our high-capacitance StackiCap 1812-4040 250V-1.2kV 100nF-5.6µF X7R capacitors for such applications. The DC link capacitor must be also able to handle twice the line frequency. Therefore, common circuit arrangements include multilayer ceramic capacitors (MLCCs) connected in parallel with other capacitor technologies to achieve this.

Another EV subsystem where DC link capacitors are found is the inverter in motor drive circuits (shown in Figure 3). The inverter converts DC power from the battery to three-phase AC power to drive the traction motors during acceleration, and then converts AC power back to DC during braking. It also detects the motor’s speed and position and drives the insulated-gate bipolar transistor (IGBT) power stages.

In this subsystem, the DC link or smoothing capacitor Cs is placed in parallel between the DC (battery) and the AC (load) sides of the voltage inverter. The capacitor specifications are very similar to the previous OBC example, and therefore the same StackiCap X7R with high RMS current capacity is recommended. Due to the high capacitance requirements, small-sized MLCCs can be used together with film and aluminum electrolytic capacitors to integrate closer to the IGBT switching device and improve high frequency attenuation.

Given the high number of converters and inverters found in EV applications, selecting the right high-voltage, high-capacitance DC link capacitor is of great importance to the overall system success.

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NIPPON CHEMI-CON - CONDUCTIVE POLYMER ALUMINUM SOLID CAPACITORS,导电高分子铝固体电容器,电容器,导电高分子杂化铝电解电容器,ALUMINUM ELECTROLYTIC CAPACITORS,CONDUCTIVE POLYMER HYBRID ALUMINUM ELECTROLYTIC CAPACITORS,铝电解电容器,CAPACITOR,ELXV500E□□221MJ25S,APXA6R3ARA101MF61G,APXD6R3ARA560ME61G,EKY-630E□□122ML40S,EMLA350ARA330MF80G,EKY-101E□□470MJC5S,EKXN401E□□151ML35S,EKZN6R3E□□272MK16S,EKXJ401E□□560MJ50S,EKYB160E□□562ML25S,EKXJ351E□□270MJ30S,EMVY100□RA472MLN0S,ELXY630E□□330MF15D,EKZH160E□□472ML25S,EMZA160□RA331MHA0G,ELXY160E□□821MJ25S,EGXF250E□□511MJC5S,ELBG250E □□ 352AK35S,ELXY350E□□272ML40S,EKZN100E□□222MJ25S,EGPA500E□□102MK35S,ELXV160E□□562ML40S,EMVL250ARA330MF60G,EKMQ101E□□2R2ME11D,APXJ2R5ARA122MH70G,EKYA100E□□122MH20D,EKWB451E□□820MM20S,ELBG250E □□ 922AMP1S,EKXJ251E□□330MJ20S,EKXL401E□□680MK35S,APSW250E□□471MHB5S,EKXN401E□□680MK30S,EMZA630□RA301MKG5S,EMVY6R3□RA682MLN0S,1,ELXZ630E□□331MJ30S,2,3,EKZN500E□□181MH20D,HHXJ250□RA681MJC5G,E MZE □□□ A RA □□□ M □□□ G,4,EKZE101E□□391MK40S,EGPA800E□□471MM20S,EMVH250□RA681MMH0S,ESRG350E□□471MK13S,EKMQ100E□□331MF11D,EMZA350□RA331MJA0G,6,EKYB6R3E□□682MK30S,EGXF500E□□241MJ16S,APSG200E□□331MH08S,EKYB250E□□151MF11D,EGXF250E□□751MJ16S,ELXZ250E□□821MJ25S,EKY-100E□□392ML20S,ELXV350E□□272MM35S,ELXV160E□□272MK35S,EKRG160E□□222ML15S,EMVY100□RA681MJA0G,EKXN451E□□820MK45S,EKY-160E□□682ML40S,ELZA250E□□272ML20S,EKHE451E□□101ML35S,EKZM350E□□222ML25S,ELXY500E□□331MJ30S,EGVD250E□□822MMP1H,EKZE100E□□222MK20S,APXE6R3ARA122MJA0G,EKYC350E□□512MM30S,EMVE100□RA222MKG5S,ELXZ6R3E□□682MM20S,EGPA500E□□122ML30S,EKZE500E□□331MJ25S,EKZN800E□□181MJ20S,EKY-350E□□222MLN3S,EKYB250E□□562MLP1S,EKYB800E□□122ML40S,EMLE6R3ARA101MF73G,EPAG401E□□101MU40S,ELXV500E□□561MK30S,EKZE630E□□182MM40S,EKWA421E□□560MJ50S,ELBG350E □□ 202AU25S,APXT100ARA121ME61G,EKXQ421E□□510ML20S,EGXF350E□□512MM35S,E KXL □□□ E □□ □□□ M □□□ S,EKY-800E□□121MJ20S,EKXL401E□□121MM30S,ELBG250E □□ 113AM40S,APXE4R0ARA561MH70G,EKYB100E□□123ML40S,EKXL421E□□680ML25S,520 EMHS250□RA332MLN0S,EGXF350E□□242MM20S,EMVL160ARA471MJA0G,EKRG160E□□332MM15S,ELXV800E□□102MM40S,EKZN630E□□182ML40S,APXH160ARA390MF61G,EKZH100E□□682ML25S,EKYB100E□□562MK35S,ELXZ630E□□101MJC5S,EKXJ421E□□560MK40S,EMLA250ARA100ME61G,APXJ2R5ARA821MF61G,EKHF451E□□101MK45S,EGPA500E□□821MU25S,EGPA800E□□681ML35S,HHXD630□RA220MF80G,EKY-350E□□122MK30S,E PAG □□□ E □□ □□□ M □□□ S,EPAG201E□□151MK30S,EKMQ100E□□472MK25S,EKZE250E□□331MJC5S,EMVJ500ARA3R3MD60G,EKZN800E□□471MK30S,ELXV500E□□180MEB5D,ELXV160E□□222MK30S,EKXJ221E□□121MU25S,ELXZ6R3E□□122MJ16S,EKMQ100E□□332MK20S,EMVE100□RA331MHA0G,ESRG500E□□102MM20S,EMLE350ARA221MJA0G,ELE-160E□□470ME11D,EKXN351E□□680MJ40S,ELXV100E□□331MH12D,ELXV500E□□181MJ20S,ELXV800E□□560MH20D,EKYA350E□□392MLP1S,EKXN421E□□560MM16S,EKZN350E□□182MK35S,EKXJ221E□□181MK40S,EKXJ421E□□330MK30S,EKZE800E□□331ML20S,EKY-160E□□103MM40S,ELE-250E□□101MF11D,ESMQ351VSN331MQ35S,NPCAP™-PSKSERIES,EMVH500□RA101MKE0S,EKYC250E□□561MJC5S,EKY-350E□□471MJ20S,EKZE6R3E□□561MHB5D,EKY-500E□□681MK30S,EGPA250E□□332MK40S,APXG250ARA100ME46G,EMZF250ARA331MJA0G,EKZE800E□□102ML40S,APSC100E□□391MHB5S,EKYC250E□□622MM25S,EKXJ221E□□331ML45S,ELXZ500E□□122ML30S,EKZN800E□□221MJ25S,EMHB630□TR331MKN0S,ELXZ350E□□271MH20D,HHXD630□RA330MJA0G,EKXN351E□□101MK40S,EMVY250□RA101MF80G,EKXJ421E□□820MMN3S,EMVL500ARA3R3MD60G,EKYC101E□□152MM40S,EKXL421E□□820MU35S,EKZM160E□□182MJ25S,EKXJ401E□□270MK20S,EKXN421E□□680ML20S,EKXN451E□□820MM20S,ELXV101E□□101MK20S,EKZE160E□□332MK35S,ELXZ100E□□471MH12D,EKXJ421E□□270MJ35S,EMZL500□RA221MJA0G,ELXV800E□□681ML40S,EGXF500E□□122MK35S,EMHL160□RA221MF80G,EKY-100E□□122MJ20S,ELXZ350E□□272MM30S,EGPA350E□□222MM25S,ELXV630E□□560MJC5S,EMZF100ARA330ME73G,ELXZ500E□□470MFB5D,EKWB401E□□680MK30S,ELE-101E□□220MHB5D,EGPD500E□□102ML20H,EMZE250ARA470MF73G,EMZE350ARA220MF73G,EKYC350E□□222ML20S,EKYB350E□□182MK30S,ELXZ250E□□331MH15D,LXVSERIES,EKZH160E□□332ML20S,EKYB100E□□222MJ25S,EKY-6R3E□□392MM15S,EKWB451E□□221MM45S,EKMQ201E□□331MM40S,GVDSERIES,EMLF350ARA1R0MD73G,EKZN800E□□271MJ25S,EKY-350E□□331MJ16S,ELXZ500E□□471MK20S,EKZN100E□□123MMP1S,EMVE250ARA220MF55G,SME,EKZM6R3E□□272MJ25S,EKYA250E□□471MJC5S,EKZN800E□□122ML40S,EKYC101E□□391MK30S,EKXJ251E□□470MJ25S,APSF6R3E□□821MF08S,SMH,ESMQ201VSN122MA30S,SMM,EKYC160E□□562MK30S,SMQ,EKLJ201E□□181MM25S,EKZH250E□□152MK20S,EKZE6R3E□□682ML25S,EKYA630E□□820MH15D,SMR,APXD2R5ARA221MF61G,APSG250E□□561MJB5S,EMLA350ARA221MJA0G,EGPD250E□□332ML20H,A PSE □□□ E □□ □□□ M □□□ S,EKZN250E□□681MJ16S,EMVY800□RA331MMH0S,EKY-630E□□681ML25S,EKZE630E□□820MH15D,EGXF350E□□332MM25S,APSG250E□□121MF08S,HHXC500□RA151MJC5G,EKXL451E□□390ML20S,EKHF421E□□221ML50S,HHXC630□RA820MJA0G,EKZE630E□□821MM25S,EGXF161E□□181MK35S,APXH2R5ARA221MF61G,EMVH500ARA100MF60G,PSC SERIES,ESMR401VSN221MP35S,EKXL451E□□820MM25S,EKHF451E□□101MM25S,EKLJ451E□□820ML40S,EMVY250ARA100ME55G,APXE4R0ARA471MH70G,AICHIP™-MHBSERIES,EKZH250E□□151MF11D,ELXZ160E□□272MK30S,EGXF630E□□681MU25S,AICHIP™-MZRSERIES,APXG160ARA271MH70G,EKMQ100E□□153MLP1S,APXH160ARA181MJ80G,HHXJ250□RA331MHA0G,APXH6R3ARA151MH70G,EMLE160ARA100MD73G,EMVJ250ARA330MF60G,EKZH6R3E□□682MK35S,ELXV800E□□271ML20S,APXG250ARA221MJA0G,EGPA800E□□561MM25S,EMHB250□RA821MKE0S,EKXL421E□□470MK30S,APSC2R5E□□152MHB5S,EKYA160E□□681MJC5S,APXK4R0ARA391MF61G,EMLA250ARA471MJA0G,EKMQ251E□□101ML25S,EMVH101□RA330MJA0G,ELBV350E□□103AM4,低姿态电源,ELECTRONICS,AUTOMOTIVE EQUIPMENT,UPS设备,LOW PROFILE POWER SUPPLY,CONTINUOUS OPERATION,COMPUTER MOTHERBOARDS,DC-DC CONVERTERS,计算机主板,长寿命产品,CONTINUOUSLY OPERATING EQUIPMENT,车载充电器,通信基础设施供电,伺服压力机,太阳能调节器,X-RAY,DC-DC转换器,POWER SUPPLY,X射线,焊机电源,连续运行,高频驱动功率转换系统,DECOUPLING APPLICATIONS,DOWNSIZED EQUIPMENT,SERVO PRESS MACHINES,HIGH FREQUENCY DRIVE POWER CONVERSION SYSTEM,去耦应用,数码产品,SOLAR POWER CONDITIONERS,UPS DEVICES,HIGH VOLTAGE INVERTER,WELDER POWER SUPPLY,ON-BOARD CHARGER,汽车设备,CAR AUDIO,高压变频器,VOLTAGE REGULATORS,LONG LIFE PRODUCTS,电压调节器,POWER SOURCE,电源,工业应用,连续运行设备,缩小设备,INDUSTRIAL APPLICATIONS,COMMUNICATION INFRASTRUCTURE POWER SUPPLY,动力源,汽车音响

24.04 - 选型指南代理服务技术支持采购服务

KYOCERA to Increase MLCC Production for 5G, ADAS and EV Technology with New Manufacturing Plant

Demand for MLCCs is expected to grow as communication terminals and semiconductor devices become more compact and sophisticated. The expanding commercialization of 5G data centers, ADAS, and EV technology will be facilitated by smaller, more functional electronic components like MLCCs.

2023-04-07 - 原厂动态代理服务技术支持采购服务

Kendeil Develops New Modular Film Capacitor K7F Series with High Energy Density and Withstand Voltages up to 900V

Kendeil is proud to announce the development of the modular film capacitor K7F series that will allow customers to not use anymore expensive bus bars, lowering also the assembly costs.

2024-11-15 - 产品代理服务技术支持采购服务

Looking Closer at Smoothing Capacitors in Electric Vehicles

For electric vehicle (EV) applications, smoothing capacitors are commonly used in the on-board charger (OBC), which is responsible for converting AC power from the electric grid into DC power that charges the vehicle’s battery.

2022-03-26 - 原厂动态代理服务技术支持采购服务

NIPPON CHEMI-CON Snap-in Type LVA Series Aluminum Capacitators, AEC-Q200 Compliant for OBC

The LVA series Aluminum Capacitators have improved the robustness and vibration capability of the standard LHS series to satisfy the automotive requirement and achieved almost the same performance as the LHS series.

2023-07-18 - 新产品代理服务技术支持采购服务

MKP-LB 系列电动汽车用直流滤波电容器（定制品）(MKP-LB 系列 DC filter capacitor for electric vehicles（customized products）)

该资料主要介绍了电动汽车用直流滤波电容器（定制品）的产品特性、性能指标和应用场合。产品采用金属化聚丙烯薄膜卷绕，工程塑料外壳封装，适用于电动汽车及混合动力汽车的直流滤波及支撑。

CG-ELEC - 电动汽车用直流滤波电容器,直流滤波电容器,DC FILTER CAPACITOR,MKP-LB,MKP-LB 系列,电动车,ELECTRIC VEHICLE,混合电动汽车,电动汽车,HYBRID ELECTRIC VEHICLE,混合动力汽车

2021/3/27 - 数据手册代理服务技术支持采购服务

用于PCB的HCDB（H）DC-Link电容器（125°C高温型）

本资料介绍了Hongfa Film Capacitors的HCDB(H)-125℃系列直流链接电容器。该产品采用金属化聚丙烯薄膜结构，具有优异的自恢复性能和高电流承载能力，可在125℃下连续运行。

宏发 - DC-LINK电容,DC-LINK CAPACITOR,宏发薄膜电容器,HONGFA FILM CAPACITORS,HCDB/2H6505*M43HC000,HCDB/2K2005*F43HC000,HCDB/2K2504*B21HC000,HCDB/3A9004*F42HC000,HCDB/□□□□□□□□□□□□□□(XXX),HCDB/1U8005*M43HC000,HCDB/2H2005*F23HC000,HCDB/1X2004*B21HC000,HCDB/1X5004*B22HC000,HCDB/1U4005*M43HC000,HCDB/1X1004*B21HC000,HCDB/3L5504*F23HC000,HCDB/2K3005*F43HC000,HCDB/2K3005*M43HC000,HCDB/1X8004*F22HC000,HCDB/1U4005*F43HC000,HCDB/1U5005*F43HC000,HCDB/2H1206*M43HC000,HCDB/2H1005*B22HC000,HCDB/3A3505*M43HC000,HCDB/2H7505*F43HC000,HCDB/1V5505*M43HC000,HCDB/1V6505*M43HC000,HCDB/1V1005*F23HC000,HCDB/1U3004*B21HC000,HCDB/1U4004*B21HC000,HCDB/1U2005*F42HC000,HCDB/2K1504*B21HC000,HCDB/3A1305*F43HC000,HCDB(H),HCDB/2H6004*B22HC000,HCDB/2H8004*B22HC000,HCDB/1V2505*F43HC000,HCDB/2H7004*B22HC000,HCDB/2K5505*M43HC000,HCDB/1X4505*M43HC000,HCDB/3A2005*M43HC000,HCDB/1V3505*M43HC000,HCDB/2K4505*M43HC000,HCDB/2H9004*B22HC000,HCDB/3A7004*F23HC000,HCDB/2H2505*F42HC000,HCDB/1V4005*M43HC000,HCDB/1X2805*F43HC000,HCDB/3L1504*B21HC000,HCDB/1U5004*B22HC000,HCDB/2H3505*F42HC000,HCDB/1V3005*M43HC000,HCDB/1V5005*M43HC000,HCDB/2H5005*F43HC000,HCDB/1V6005*M43HC000,HCDB/1V5504*B22HC000,HCDB/3A2504*B22HC000,HCDB/2H4005*F43HC000,HCDB/1U1205*F23HC000,HCDB/1X3505*M43HC000,HCDB/1X2505*F43HC000,HCDB/1X2505*M43HC000,HCDB/1U6004*B22HC000,HCDB/1U7004*B22HC000,HCDB/1X1505*F43HC000,HCDB/1U1505*F42HC000,HCDB/2K2004*B21HC000,HCDB/3L1005*F43HC000,HCDB/3A1605*F43HC000,HCDB/1V7004*B23HC000,HCDB/2K1004*B21HC000,HCDB/3L4004*F22HC000,HCDB/3L8504*F43HC000,HCDB/1X1805*F43HC000,HCDB/3L2005*F43HC000,HCDB/2H6005*F43HC000,HCDB/1U1504*B21HC000,HCDB/3L1105*F43HC000,HCDB/1V8004*B23HC000,HCDB/1V8004*F23HC000,HCDB/1X9004*F23HC000,HCDB/2K6504*B23HC000,HCDB/2K6504*F23HC000,HCDB/2K1005*F42HC000,HCDB/2H1006*M43HC000,HCDB/1U4505*F43HC000,HCDB/3L1205*F43HC000,HCDB/2K4004*B22HC000,HCDB/1U2505*F43HC000,HCDB/1U3505*M43HC000,HCDB/2K3004*B22HC000,HCDB/1U3505*F43HC000,HCDB/2K1505*F42HC000,HCDB/1V5004*B22HC000,HCDB/2K6004*B23HC000,HCDB/1V4004*B22HC000,HCDB/2K5004*B23HC000,HCDB/2K1205*F42HC000,HCDB/3A6003*B21HC000,HCDB/2H7005*M43HC000,HCDB/2K9004*F23HC000,HCDB/2H8005*M43HC000,HCDB/1U1805*F42HC000,HCDB/2K8004*F23HC000,HCDB/2K2505*F43HC000,HCDB/2K1805*F43HC000,HCDB/2K7004*F23HC000,HCDB/1X2005*M43HC000,HCDB/1U4505*M43HC000,HCDB/1V1004*B21HC000,HCDB/1X1005*F23HC000,HCDB/3L5004*F23HC000,HCDB/1V2004*B21HC000,HCDB/3L6004*F23HC000,HCDB/3L7004*F42HC000,HCDB/1U1005*B23HC000,HCDB/1U8505*M43HC000,HCDB/3L1505*F43HC000,HCDB/2H9005*M43HC000,HCDB/1V3004*B21HC000,HCDB/1U6505*M43HC000,HCDB/1U7505*M43HC000,HCDB/3L2505*F43HC000,HCDB/3L9004*F43HC000,HCDB/3L7504*F42HC000,HCDB/3L1605*F43HC000,HCDB/3A1205*F43HC000,HCDB/3L2004*B21HC000,HCDB/3A1805*M43HC000,HCDB/2H1106*M43HC000,HCDB/1X1205*F42HC000,HCDB/1V3005*F43HC000,HCDB/1V4005*F43HC000,HCDB/2H3004*B21HC000,HCDB/1V2005*F43HC000,HCDB/1X7004*F22HC000,HCDB/2H4004*B21HC000,HCDB/1X6004*F22HC000,HCDB/3A5004*F22HC000,HCDB/3A4004*B22HC000,HCDB/1V1505*F42HC000,HCDB/1X5004*F22HC000,HCDB/3A4004*F22HC000,HCDB/1U9004*B23HC000,HCDB/1V1504*B21HC000,HCDB/1V2504*B21HC000,HCDB/3L1004*B21HC000,HCDB/1U8004*B23HC000,HCDB/1X3004*B22HC000,HCDB/3A1504*B21HC000,HCDB/2H2004*B21HC000,HCDB/2H5505*M43HC000,HCDB/1X1504*B21HC000,OBC,DC-DC CONVERTERS,WPT,DC-DC转换器

2024/6/18 - 数据手册代理服务技术支持采购服务

SLCs vs. MLCCs: Which Capacitor Type is Right for My Application?

One early decision that circuit designers must make is to determine if a single-layer capacitor (SLC) or multi-layer ceramic capacitor (MLCC) is the right fit for their application needs.

2022-02-24 - 设计经验代理服务技术支持采购服务