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EMC & Circuit Protection EMC filter for regenerative applications


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chaffner, an international leader in the fields of electromagnetic compatibility and power quality, has introduced the new FN3840 for use in Active Infeed Converter (AIC) or Active Front End (AFE) applications where energy is fed back to the power grid. This process reduces energy costs in larger factories or can be used to reduce losses and excess heat in converters. When the semiconductors of the converters are switching directly towards the mains power network, they create a high voltage and current ripple. The inclusion of an LCL-filter such as the recently launched FN6840 can further reduce this effect and improve power quality.


FN3840 series of filters are said to provide state-of-the-art EMI attenuation based on a filter topology and help to ensure compliance with Class C2 or even C1 limits. Applications


include regenerative drives in combination with LCL filters, active infeed converter (AIC), active front end (AFE) variable frequency drives (VFD), three-phase variable speed drives (VSD) and power drive systems (PDS), renewable energy, machine tool and machinery equipment, and process automation equipment. In systems where compliance to EMC regulations at frequencies above 150kHz need to be considered not every EMC-filter can be connected in-line with an LCL-filter. The inductive components of an LCL-filter can resonate with the capacitors of the EMC-filter and vice versa. To overcome those effects and to avoid damage of the drive, a careful design of the EMC-filter circuit is mandatory. The new Schaffner FN3840 has been fully tested and may be combined with a Schaffner FN6840 LCL-filter in an AIC/AFE application. The FN3840 is fitted with an onboard


temperature monitor to provide protection from overheating. The switch will open at the critical temperatures of 180°C, or 150°C for busbar versions. This provides an extra safety layer for machine builders. In the event of an open temperature switch the


Active Infeed Converter can react and reduce or switch off power.


The new Schaffner FN3840 is supplied in a slim book-style shape allowing convenient and space-saving installation next to inverters, converters or motor drives. Connection is via solid safety connector blocks and versions are available with low leakage current. The new FN3840 filters offer very high


saturation performance combined with high EMI performance fulfilling the requirements in IEC/EN 61800-5-1 for electric strength, clearance and creepage, IEC/EN 60204-1 for insulation resistance, electric strength, clearance and creepage, and the requirements in IEC/EN 62477-1.


www.schaffner.com


Precision-adjustable current limit power switch protects automotive subsystems


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iodes Incorporated has introduced the AP22653Q programmable current limiting power switch. Streamlining power system design and


assuring ongoing reliability, this automotive- compliant device provides a controlled and protected power path. It is rated to handle continuous load currents of up to 1.5A. Key applications include protection of vehicle USB ports and ECU supply rails, and infotainment and telematics subsystems.


current limit threshold can be simply set anywhere between 125mA to 1735mA via use of standard value external resistors. The device’s controlled rise and fall times help to mitigate the effect of surges during turn on/ off. In addition, its 5μs short circuit response helps avoid situations requiring system shutdown/restart.


With a tight accuracy margin of ±7% at high current levels, the AP22653Q’s


The AP22653Q has a 55mΩ (typical) on- resistance, which significantly reduces power loss and voltage drop at high load currents. The reverse-current protection integrated


into this device safeguards against reverse currents when peripherals are being externally powered. Overtemperature protection and undervoltage lockout features are also included. An operational temperature range of -40°C to 125°C is supported.


The AP22653Q power switch is qualified to AEC-Q100 Grade 1, is manufactured in IATF 16949 certified facilities, and is PPAP capable.


www.Diodes.com Next-generation supercapacitors for automotive


EMET, part of the YAGEO Group and a global electronic components supplier, has announced its new high-performance supercapacitors for automotive electronics, the FMD and FU0H series. These series deliver 1,000 hours at 85°C/85% RH-rated voltage and operational temperature ranging from -40°C to 85°C. The FMD series offers the highest lifetime with up to 4,000 hours.


These supercapacitors are qualified to an automotive testing protocol. These capacitors are manufactured in an ISO TS 16949 certified


38 September 2021


plant and are subjected to PPAP/PSW and change control. They are suitable for automotive applications needing a main power system backup during a power loss, such as ADAS, autonomous vehicles, and central gateway ECUs. Supercapacitors are ideal for maintaining the main power system’s real-time clock or volatile


Components in Electronics


memory when it is removed, such as during a power failure or when the main power system’s battery has been removed for replacement. Additionally, these supercapacitors offer power backup in equipment ranging from IoT devices, smart meters, medical devices, and industrial computing.


The supercapacitor’s benign open-circuit failure mode contrasts with typical short-circuit battery failures that may result in outgassing or ignition. Supercapacitors are also said to be a cost-effective alternative to small backup batteries. Depending on the type of load and


current demand, they can store enough energy to provide backup for durations ranging from a few seconds to several hours.


KEMET’s miniature supercapacitors use a proprietary aqueous electrolyte solution that provides high durability against liquid leakage, vibrations, and thermal shock, thus high reliability in harsh environments. Aqueous electrolytes are highly conductive, have a low environmental impact, and are non-toxic and non-flammable.


www.kemet.com www.cieonline.co.uk


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