What is recommended for external fuses or circuit breakers for a DRB DIN Rail power supply?

TDK-Lambda presents a short video that explains exactly what is recommended for external fuses and circuit breakers for DRB series of DIN Rail power supplies.

To watch the video, please visit click onto: What is recommended for external fuses or circuit breakers for DRB?

To read more about the DRB series, please visit: www.uk.tdk-lambda.com/drb

For more information about TDK-Lambda’s full DIN Rail power supply line up, please visit: www.uk.tdk-lambda.com/din

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.


Year in Industry scheme proves success for Power Supply Manufacturer

• Paid career development work placements organised through the EDT

TDK Corporation is pleased to announce that TDK-Lambda UK’s involvement with the EDT’s (Engineering Development Trust) Year in Industry (YINI) scheme is proving a success for the company.

The EDT organises a range of work-related STEM (science, technology, engineering and mathematics) enrichment activities for 11-21 year olds across the UK. The YINI scheme coordinates paid career development work placements for students completing A-levels/Scottish Highers/equivalent qualifications or as part of a university sandwich year.

Osamah Bayati, studying Computer Networks and Communications at the University of Westminster, School of Electronics & Computer Science, completed his YINI programme with TDK-Lambda UK in July 2013. During his placement Bayati investigated the potential impact of introducing Desktop Virtualisation into the company; this separates the desktop environment and associated application software from the physical client device that is used to access it.

“Desktop Virtualisation could offer potential business benefits in relation with business continuity and disaster recovery, capital cost reductions and a decrease in IT administration overheads,” explains Clive Davies, Manufacturing Engineering & IT Manager, TDK-Lambda.

Bayati considered many factors including the cost of implementation, end-user performance and experience, image management, WAN (Wide Area Network) requirements, monitoring and reporting techniques and training needs.

“To this end Osamah worked with a number of providers to conduct various experiments that involved active TDK-Lambda employees working in a ‘virtualised’ environment,” adds Davies. “This was a very high level project, Osamah’s professional approach to the project and his attention to detail enabled us to fully understand the potential, or not, that Virtualisation can bring to our business.”

Kacper Terebus, who is studying Computer Hardware and Software Engineering at Coventry University, undertakes this year’s YINI placement with TDK-Lambda UK. Based within the Sales & Marketing Department, he is working on a web-based application for the sales team.

“Kacper’s project is proceeding extremely well,” comments Paul Goodwin, Product Manager, TDK-Lambda. “We anticipate that he will complete it ahead of schedule, with more of the requested features implemented at release than were originally planned.”

“I am a strong supporter of the YINI programme,” concludes Phil Scotcher, General Manager, TDK-Lambda. “The placements give us access to talented, dedicated students who can drive the business forward, while we help students develop and build the skills and knowledge for which future employers are looking – it’s also a great way to earn while you learn.”

For more information about TDK-Lambda, please call us directly on +44 (0)1271 856600 or visit the website at: www.uk.tdk-lambda.com


Underwater Laser Scanners

HWS AC-DC Power Supply

Underwater laser scanning technology is used to capture high-detail measurements of sub-sea structures to create 3D models for analysis; these scanners are regularly used in the offshore industry for the inspection of pipelines and oil rigs. TDK-Lambda’s long lasting relationship with a laser manufacturer has resulted in the high reliability HWS100-48/A, part of the HWS industrial power supply series, being selected to be used as part of the company’s scanning equipment.



Solid State Power Amplifiers

RFE Single-output 1U front end power supplies

The TDK-Lambda RFE series power supply has been selected by a manufacturer for its solid state power amplifiers, which are used extensively in scientific research applications. Multiple RFE units can be connected in parallel to produce the high power levels required for the RF system.



100W to 600W RWS-B Series of AC-DC Power Supplies

• 10-year+ e-cap lifetime for high reliability
• Global safety approvals support worldwide use
• 5-year warranty


TDK Corporation announces the launch of its new RWS-B Series of enclosed AC-DC single output power supplies. Available in four power levels between 100W and 600W, the TDK-Lambda RWS-B models operate from a universal input of 85 – 265Vac (47 – 63Hz) to meet a wide range of applications, including industrial, test & measurement, broadcast, communications and LED signage. The RWS-B range features a 10 year e-cap lifetime (or greater under typical operating conditions) for high reliability and comes with a 5-year warranty.

The new RWS-B series (RWS100B, RWS150B, RWS300B and RWS600B) offers significant improvements over previous generation products, including up to 5% efficiency gain (the 150W RWS150B-24 model, for instance, achieves a typical efficiency of 89%), and a reduction in size to help ease system integration.

Standard output voltages range from 5 to 48Vdc, delivering currents up to 100A. To accommodate non-standard system voltages, the RWS-B series is user adjustable by
-10/+15% (+10% for 48V models). Regular features include over current and over voltage protection circuitry.

All models offer outstanding thermal performance for cooler operation over their operating temperature range of -10 to +70°C; the RWS100B and RWS150B models are convection cooled, whereas the higher power models incorporate an internal cooling fan.

The TDK-Lambda RWS-B series offers curve B conducted and radiated EMI performance (EN55011/EN55022-B, FCC class B, VCCI-B) and is approved to a wide range of safety standards including UL/ CSA/EN60950-1, UL508 (on certain models) and carries the CE mark, according to the Low Voltage and RoHS2 Directives.

For more information about the RWS-B series, please call TDK-Lambda directly on +44 (0)1271 856600 or visit the website at: www.uk.tdk-lambda.com/rws-b


Bias Current Source

KM series AC-DC PCB mount medical power supply

A long lasting relationship between TDK-Lambda and a top electronics equipment manufacturer has resulted in the KMD10-1212 being selected for use in the company’s equipment. This compact and lightweight, enclosed PCB mount power supply is available with single, dual and triple outputs and features a wide range input.



How AC-DC power supplies can run from a DC input

Many standard AC-DC switched mode power supplies (most of TDK-Lambda’s products) will operate from a high voltage DC input range (typically 120-330Vdc) in addition to the more common AC input range of 90-264VAC. One word of caution – carefully check the safety approval status. For many products it only covers AC-DC operation. We strongly recommend users to contact their supplier for guidance on safe installation.

We receive many questions about how and where to connect the DC input to an AC-DC supply that is specified to operate from DC as well as an AC input.

To read more about where and why DC power is used, please visit: www.uk.tdk-lambda.com/faq

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.


Z+ High Voltage Series of Programmable Power Supplies

Zplus HV

• 200W and 400W with 160, 320 or 650Vdc output
• Bench or 2U Rack Mounted
• 5-Year Warranty

TDK Corporation announces the introduction of high voltage units within the TDK-Lambda Z+ series of 200W and 400W programmable DC power supplies. The new Z+ high voltage series is offered with output voltages of up to 160, 320 or 650Vdc extending the line-up from 100Vac maximum. These higher voltages address the requirements for applications such as deposition processes, ROVs, ATE systems as well as general laboratory and industrial use.

Carrying a 5-year warranty, the TDK-Lambda Z+ high voltage series shares the same features and compact dimensions as the other Z+ ranges and achieves efficiencies of up to 86%. The units can operate in either constant current or constant voltage modes and accept a universal (85-265Vac) input. Higher power systems can be achieved by connecting up to 6 units in parallel in master-slave configuration. To increase the output voltage or to provide a bipolar output, up to 2 identical units may be connected in series with external diodes.

All models can be programmed via the front panel or remotely by using the built-in USB, RS232 / RS485 or analogue control interfaces. Optional LAN, GPIB (IEEE488) and isolated analogue programming interfaces are also available.

CE marked for EMC and in accordance with the LV (low voltage) and RoHS Directives, the Z+ high voltage series conforms to EN55022/EN55024, as well as IEC/EN61326-1 for conducted (FCC part-15-B and VCCI-B) and radiated (FCC part-15-A and VCCI-A) EMI. Safety approvals include UL/EN/IEC61010-1, and the Z+ high voltage series is designed to meet UL/EN60950-1.

For more information about the full range of TDK-Lambda Z+ high voltage series of programmable DC power supplies, please call TDK-Lambda directly on +44 (0)1271 856600 or visit the TDK-Lambda website at: www.uk.tdk-lambda.com/zplus


Power Supply Operation on a 400Hz Source

This article is intended to provide a general overview on using industrial power supplies with an aircraft 400Hz electrical source.

Most large aircraft are fitted with an Auxiliary Power Unit (APU) supplying a phase to neutral 115Vac 400Hz source. The APU is used primarily to start the aircraft engines, but is also used to run accessories on the plane while passengers are on board and for preflight checks by the crew when the aircraft has left the gate.

The reason 400Hz was chosen over the traditional 50/60Hz is because of weight. A 400Hz generator is much lighter, thus saving fuel, and the need to support a heavier unit making the airframe lighter.

MIL-STD-704F is the specification that covers Aircraft Electrical Power Characteristics for US military aircraft, and covers in detail all aspects of the requirements.

If an aircraft is being serviced on the ground, it is more convenient and safer not to have either the main engines or the APU running. In this case an external 400Hz generator or Ground Power Unit is usually available. Often diagnostic equipment is not required to meet the full flight specifications and for cost purposes a regular industrial power supply can be chosen.

TDK-Lambda is often asked if one of our AC-DC industrial power supplies will work off 400Hz input, usually the answer is “yes”; the following explains why:

For low wattage power supplies (50W or less), the input circuit is a simple full wave bridge rectifier.

Fig. 1: Simple full wave bridge rectifier circuit

Fig. 1: Simple full wave bridge rectifier circuit

The AC voltage is filtered and then full wave rectified into high voltage DC. With a 60Hz input, the ripple voltage on the bulk cap is 120Hz. With a 400Hz input, the ripple voltage is 800Hz (hence smaller), having no impact on the performance of the power supply.

For power supplies greater than 50W, many AC-DC power supplies have active Power Factor Correction circuitry. Simply put, a boost converter is used to reduce the input harmonic currents by changing their shape to appear more sinusoidal – as if the load were resistive.

Fig. 2: Boost Converter

Fig. 2: Boost Converter

The Boost FET in the above circuit diagram is driven by a control IC. The IC regulates the converter receiving feedback from three sources: the 100-120Hz rectified input voltage (Point “A”), the inductor current and the DC voltage across the bulk capacitor.

Although most PFC circuits will operate from a 400Hz input, the wave shape of the current harmonics is slightly degraded due to distortion at Point “A” (now an 800Hz waveform). This, however, is usually acceptable for ground based equipment.

Fig. 3: Simplified Diagram Showing “Y” cap locations

Fig. 3: Simplified Diagram Showing “Y” cap locations

To reduce high frequency radiated and conducted noise, power supply input filters use special ‘Y’ decoupling capacitors connected from the Line & Neutral to Chassis (Earth) ground. In addition to high frequency current, these Y capacitors also provide a path for 50/60Hz current.

The maximum value of this ‘earth leakage’ current is dictated by the safety agencies like UL, particularly for equipment that is plugged into a regular wall socket found in an office (for example). For large pieces of equipment that is hard wired to an AC source, the limits are much higher.

With a 400Hz input, the earth leakage current is significantly increased through the Y (input to ground) capacitors as that current is directly proportional to the input frequency:

I = V x (2 Π fC)

However, ground based equipment running off 400Hz generators falls into the hard wired category, so this is not normally a problem.

One last note; although commercial power supplies are safety certified to the Information Technology Equipment standard IEC 60950-1, testing for the report is usually conducted with a 50-60Hz input. Most ground based aircraft systems do not fall under IEC 60950-1 but using a power supply certified to that standard means the product has been rigorously tested.

For more information, please contact www.uk.tdk-lambda.com


RF Amplifiers

HFE Front End Power supply

A manufacturer of RF amplifiers has selected the HFE power supply from TDK-Lambda. The great features of the HFE-2500-48, which include high power density and efficiency, internal ORing MOSFET and current share and PMBus option, made the TDK-Lambda product highly appealing during the customer’s selection process.