Looking Closer at DC Link Capacitors in Electric Vehicles

Posted by Peter Matthews on Jun 1, 2022 8:30:00 AM

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).

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Topics: Capacitor, Automotive, Electric Vehicles

Looking Closer at Smoothing Capacitors in Electric Vehicles

Posted by Simon Mao on Mar 9, 2022 8:30:00 AM

In power electronics, rectification is the conversion of alternating current (AC) to direct current (DC). After the AC signal enters a rectifier circuit consisting of power diodes, the resulting raw rectified waveform yields a series of half sine waves with significant ripple. In order to minimize the pulsating DC voltage, a smoothing capacitor is placed in parallel with the load across the rectifier output. As the rectifier voltage rises, the capacitor charges and stores energy like a reservoir. Then when the rectifier voltage falls, the capacitor discharges, greatly reducing the ripple voltage.

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Topics: Capacitor, Automotive, Electric Vehicles

It’s Still Possible to Drive EV Innovation and Minimize Lead Times Today

Posted by Brandon Peeler on Mar 2, 2022 9:00:00 AM

As more consumers consider trading in their combustion vehicles for electric vehicles (EVs), EV manufacturers are trying to rapidly innovate on internal and external charging technologies to ease consumer fears relating to range anxiety and charging times. Therefore, EV manufacturers are focused on developing technologies that will increase the efficiency of both on-board and external power conversion and management devices.

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Topics: Capacitor, Electric Vehicles

Webinar: Addressing MLCC Performance Issues in High-Voltage EV Applications

Posted by Steve Hopwood on Jan 19, 2022 9:00:00 AM

In recent years, multilayer ceramic capacitors (MLCCs) have emerged as an excellent capacitor option for the high-power electrical systems needed in electric vehicle (EVs) due to their small physical size, low inductance, and ability to operate at higher temperatures. However, EV engineers are facing two big challenges with using MLCCs including DC bias that can cause capacitance loses of 80 to 90 percent of their quoted value and self-heating issues from AC ripple that can lead to inefficiencies in circuits as well as increased cooling demands. 

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Topics: Capacitor, News and Events, Electric Vehicles

New Low Loss, Ultra Stable High-Capacitance MLCCs for Power Electronics

Posted by Steve Hopwood on Dec 1, 2021 9:00:00 AM

Many power electronics today are being designed for use in high-temperature, high-voltage environments, such as inside electric vehicles (EVs). However, size, weight, and power (SWaP) are also key factors driving electronic product development. These conflicting design criteria are an issue for many electrical engineers because space is not available to simply add a cooling system, as this will add weight and increase the product’s overall footprint. Therefore, many of these electronic components are susceptible to “running hot” at the high temperatures and high voltages used in these tiny spaces.

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Topics: Capacitor, Electric Vehicles, High Reliability

Looking Closer at Resonant Capacitors in Electric Vehicles

Posted by Simon Mao on Nov 23, 2021 7:15:00 AM

One of the primary goals in electric vehicles (EVs) is to increase the efficiency of its power conversion devices. The more efficiently power is converted, the further distance the EV can travel on one charge. For example, by reducing losses in a DC-to-DC (or DC/DC) converter, the converter (and overall vehicle) benefits from improved energy efficiency, a more streamlined design, and diminished heating from components.

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Topics: Capacitor, Automotive, Electric Vehicles

Live Webinar: Addressing MLCC Performance Issues in High-Voltage EV Applications

Posted by Steve Hopwood on Nov 10, 2021 9:00:00 AM

Join us and Charged EVs on Wednesday, November 17 at 10 am EDT for our latest live webinar – Addressing MLCC Performance Issues in High-Voltage EV Applications.

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Topics: Capacitor, News and Events, Automotive, Electric Vehicles

Overcoming EMI in Electric Vehicle Applications

Posted by Peter Matthews on May 26, 2021 9:00:00 AM

According to the U.S. Bureau of Transportation Statistics, 2020 was the fifth consecutive year of growth in electric vehicle (EV) sales, and the demand is growing. Based on the first quarter numbers, the Bureau anticipates 2021 sales are on a path to surpass last year’s. 

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Topics: Automotive, Electric Vehicles

Join Us Virtually at The Battery Show Europe 2021

Posted by Dan Gaffney on May 12, 2021 9:00:00 AM

Join Knowles Precision Devices and many members of the advanced battery and EV/HEV community from May 18 – 20 at this year’s virtual edition of The Battery Show Europe. Since this year’s show has been designed to virtually recreate the tradeshow experience from the comfort and safety of your own home or office, we will be exhibiting a variety of our advanced battery technology at virtual booth 8-351.

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Topics: News and Events, Automotive, Electric Vehicles

Looking Closer at Filter Capacitors in Electric Vehicles

Posted by Peter Matthews on Mar 3, 2021 7:00:00 AM

In electric vehicle (EV) applications, filter capacitors are a special type of component commonly used as input and output capacitors. Also known as noise suppression or electromagnetic interference (EMI) filters, these particular capacitors act to remove noise and other unwanted signals on the line. On the high voltage alternating current (AC) side of a system, the capacitors often provide EMI filtering, whereas on the direct current (DC) side of a subsystem, they serve to smooth ripple components of the AC and filter out noise.

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Topics: Capacitor, Automotive, Electric Vehicles

Insights Into Precision Passive Devices

Knowles Precision Devices is a premier global source for Capacitors, RF Filters, EMI Filters, Resonators, non-magnetic components and advanced dielectric materials. An umbrella for the brands of Compex, DLI, Johanson MFG, Novacap, Syfer and Voltronics, Knowles Precision Devices serves a variety of markets including military, aerospace/avionics, medical equipment, implantable devices, EMI and connector filtering, oil exploration, instrumentation, industrial electronics, automotive, telecoms and data networks.

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  • Filters for 5G and mmWave
  • Capacitors for High Voltage
  • Capacitors for High Reliability

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