Power Electronic Tips

Low-profile, three-phase power supply features wide input voltage range for industrial use

Redding Traiger — Wed, 22 May 2024 17:58:50 +0000

COSEL Co., Ltd. announced the launch of the HFA3500TF, a low-profile 3-phase, 3-wire 3500W AC/DC enclosed power supply designed for industrial equipment such as semiconductor manufacturing, laser processing machines, and robotics. The HFA3500TF addresses worldwide applications and 3-Phase Delta or 3-Phase Star networks, with an input voltage range of 180VAC to 528VAC. Utilizing an energy-optimized, digitally controlled switching topology and Wide Band Gap (WBG) semiconductors, the power supply offers an efficiency of up to 94% at 400VAC input and 65VDC output.

The HFA3500TF is available in two output voltages, 48VDC, and 65VDC, adjustable in the range of +15% to -50% using the trim function. The compact, low-profile design measures 41mm (1.61 inches) high with a cover and features two variable-speed cooling fans. For higher power applications, the HFA3500TF can be connected in parallel to up to ten units, delivering up to 31.5kW.

The low-profile design fits into the vertical space of a 1U (44.45 mm) rack unit, facilitating easier integration into compact machines and saving space in industrial environments. To ensure performance and reliability in the low-profile package, the power supply is designed for high performance and optimized to eliminate hot spots and facilitate cooling. It combines an innovative mechanical layout with an optimized digitally controlled switching topology and a power stage with Silicon Carbide (SiC) MOSFETs and diodes, providing up to 94% efficiency at 400VAC input for the 65V output model.

The HFA3500TF is designed to accommodate 3-phase three-wire delta or 3-phase three-wire star installations, reducing single-phase peak loads and optimizing load balancing on networks. With an input voltage range of 180 to 528VAC, the 48VDC/73A unit is adjustable from 24.00 to 55.20VDC, and the 65VDC/54A model is adjustable from 32.50 to 74.75VDC. Under nominal working conditions, the output power is 3.5kW.

The power supply includes a 12VDC/1A auxiliary output for remote ON/OFF, isolated from the input, output, and Functional Ground. It also features inrush current limiting circuitry, overcurrent and overvoltage protection, and thermal protection. The power supplies can operate in an ambient temperature range of -10 to +70°C, with two cooling fans with automatic speed control for ventilation.

The HFA3500TF includes an input filter and complies with various EMC standards, including FCC Part15 class A, VCCI class A, CISPR11 class A, CISPR32 class A, EN55011-A, and EN55032-A. It has an input to output isolation of 4,243VAC, input to ground (FG) of 2,829VAC, and output to ground (FG) of 2,000VAC. At its rated load and with 480VAC, 60Hz supply, the leakage current is 3mA maximum, complying with IEC62368-1.

Designed for integrated industrial applications in 1U height, the HFA3500TF measures 110 x 41 x 468mm (WxHxD) and weighs 3kg max. The 48VDC output model is suitable for measurement and analysis equipment, machine tools, and semiconductor manufacturing equipment required to sustain sag immunity conditions, such as specified by the SEMI F47 standard. The 65VDC model is ideal for powering Radio Frequency Power Amplifiers (RFPA) and 60V Lithium-Ion battery chargers.

The HFA3500TF complies with safety requirements UL62368-1, EN62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1), RoHS, and Low Voltage directives, carrying the CE mark and UKCA. For applications requiring operation in harsh environments without ventilation, COSEL offers the HCA3500TF, designed for baseplate conduction cooling.

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Regenerative power sources and loads emulate real-world power flows

Aimee Kalnoskas — Mon, 29 Apr 2024 16:56:04 +0000

Pacific Power Source announced its regenerative product line to support the growing demand for electrification. The line includes the AGX Regenerative AC/DC Source, RGS Regenerative Grid Simulator, and RLS Regenerative Load Simulator.

These bidirectional sources and loads emulate real-world power flows, making them ideal for testing the utility grid, EV chargers, Vehicle-to-Grid (V2G), Vehicle-to-Home (V2H), Solar PV/grid-tied inverters, home energy storage systems, avionics power converters, UPS, PDUs, and more.

The new line of regenerative test solutions offers flexibility, performance, and intelligence. These test systems integrate a 4-quadrant design in Silicon Carbide (SiC)-technology to support voltage range, current, and power specifications.

The SmartRegen products have greater than 90% energy efficiency and a high-power density with up to 21kVA in a single 4U chassis, saving costs and space. Modular by design, these rackable series can scale up to 168kVA power in a single 19″ cabinet and can be paralleled up to 252kvA to meet future requirements. The voltage ranges cover 350VLN / 606VLL in AC mode or ±500Vdc in DC Mode with high AC current capability. The system’s fully galvanic-isolated protection features protect the operator and UUT.

Simultaneous AC and DC operation of modes per phase and the automatic switching of output modes provide test engineers with a unique capability and flexibility. Multiple, user-friendly control options provide extensive control of AC and DC test parameters. Engineers and Researchers can select from a wide range of test sequences or easily create their own with built-in powerful custom waveform creation and measurement tools.

Pacific Power Source’s embedded proprietary SmartSource Suite remote control platform provides advanced real-time control and analysis. Test sequences can be fully developed and executed using the web browser interface, reducing testing time.

The AGX Series Regenerative 4 Quadrant AC/DC Source is a multi-functional test system that can be used as a fully programmable AC/DC power source, current source, and electronic load. It features AC, DC, and AC+DC output capability and an extended frequency range up to 3000Hz.

The RGS Series Regenerative Grid Simulator is designed for testing and verification of all grid-tied applications. It can emulate almost any grid condition and test to regulatory compliance standards such as IEEE 1547, UL 1741, IEC 61000-3, IEC 61000-4, and more.

The RLS Series Regenerative Load Simulator is a Four-quadrant AC and DC electronic load designed for testing any AC and DC load applications. The RLS features several AC and DC emulation modes and provides flexible configurations of single, split and 3-phase operation, and steady-state or transient execution.

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DIN rail power supplies series now includes high-power three-phase AC input options

Redding Traiger — Wed, 27 Mar 2024 19:03:13 +0000

TDK Corporation announces the addition of higher power, three-phase AC input models to the TDK-Lambda DRB series of DIN rail mount power supplies. With 24V, 48V, and 72V outputs, the products are rated for continuous operation at 480W or 960W and can deliver a boost of 720W and 1440W respectively for up to seven seconds. This, and a constant current overload characteristic, enables operation with capacitive and inductive loads. These power supplies also feature a very low energy inrush current upon initial start-up, reducing the nuisance tripping of input circuit breakers. The DRB three-phase series can be used in a wide range of applications, including conventional switch cabinets, stand-alone machinery, and industrial systems, as well as information and communications technology.

The units have a wide input range of 350 to 575Vac and are housed in a rugged metal enclosure with dimensions of 65mm (width) x 129mm (height) x 159.3mm (depth) for the 480W models and 100mm (width) x 129mm (height) x 171.9mm (depth) for the 960W. This saves space on the DIN rail for other components and reduces cost. A choice of screw terminals or push-in connectors are available for the input and output wiring. The DRB480 and 960 models have a high operating efficiency of up to 96.3% and a low standby power consumption of <2.3W when using the remote on-off function (inhibit). This reduces energy usage and contributes to a lower CO₂ footprint of the entire system. Lower losses also reduce internal heating inside the power supplies, preventing electrolytic capacitor dry-out for long field life.

For higher power or redundant systems, the front panel DIP switch enables droop mode current sharing for parallel operation. These new models have a wide adjustment range of 22.5 to 29V (24V nominal), 45 to 56V (48V nominal), and 70 to 85V (72V nominal) to allow compensation for cable drops, ORing FETs or setting to non-standard output voltages. In addition to two LED indicators, a DC OK relay contact is available for remote monitoring, and remote on/off is possible by applying an external voltage to the inhibit relay contact.

Input to output isolation is 3,510Vac, input to ground 2,210Vac, and output to ground is 1,390Vac. The DRB models are convection cooled and rated for operation in -25 to +70°C ambient temperatures, with derating above 55°C.

The units are certified to IEC/EN/UL/CSA 62368-1, 61010-1, 61010-2-201 and are CE / UKCA marked to the Low Voltage, EMC, and RoHS Directives. They meet EN 55011-B and CISPR11-B radiated and conducted emissions. The series also complies with EN 61000-3-2 (Class A) harmonic currents and IEC/EN 61000-6-2 immunity standards.

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