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FEATURE POWER


A CUSTOMISED SOLUTION for laser power supplies


Power supply units for high-power laser diodes in research systems


require special capacitors which must ensure fast discharge of the energy that is needed for the generation of high-current pulses. To meet the demands, SCHUMACHER Elektromechanik has specified customised capacitors from MERSEN


B


eginning with the production of manufacturing transformers, industrial electronic components and power supply units back in


1949, SCHUMACHER Elektromechanik went on to make a major contribution to the development and production of the first model wireless remote control. Following this, in the 1990s the company produced the first special power supply units for lights, and later on for industrial and laser applications – the latter including the necessary software controllers. Today, it specialises in the development of laser power supply units, as well as integrated cooling units and their controllers. This is achieved by means of state-of-the-art production systems. In fact the company is particularly active in the areas of laser power


supply units and controllers, with various laser types requiring custom solutions. The SCHUMACHER product spectrum ranges from CW power supplies for argon lasers and high-voltage power supplies for CO2


lasers,


through CW and pulse power supplies for light-pulsed and diode-pumped lasers, all the way to integrated cooling elements, Pockels cell drivers, TEC controllers, Peltier power supplies and controller supplies for excimer lasers. It is, however, also possible to combine different supply types. The power supply units cover power ranges from a few watts to 20KW.


BUFFERING THE VOLTAGE Buffering of the voltage in the power supply units requires capacitors – and for this SCHUMACHER has specified products from MERSEN for many years, in particular aluminium electrolytic capacitors in the SIH and GW series. The latter, for example, are used in the power supply units for high- power laser diodes in research systems where fast discharge of the energy is needed for the generation of high-current pulses of around 100-500µs. The high reliability aluminium electrolytic capacitors are integrated in the capacitor bank of a laser power unit, where they buffer the supply voltage. The GW series are threaded FTCAP capacitors that are insensitive to high


ripple currents. As the high currents also cause increased temperatures in the capacitors, a special winding construction is used to ensure optimal heat dissipation at the capacitor base. In addition, the GW series is optionally equipped with base cooling by means of a Sil-Pad that dissipates the heat. The GW series features a patented stepped


base which ensures that the base of the capacitor is flat despite the adjacent heat shrink tube. This reduces air inclusions which would otherwise hinder dissipation of heat from the capacitor to the heat sink. Thermal resistance is substantially lower, enabling the processing of high loads despite the compact design. In addition, the cup features an outer bead, which allows seamless mounting of the capacitor to a heat sink by means of a ring clamp


10 APRIL 2021 | DESIGN SOLUTIONS


manufactured in-house by MERSEN. As the pad and the use of a ring clamp for mounting electrically insulate the capacitor from the heat sink, this provides a large leakage distance that prevents the flow of residual earth-fault currents. Despite being compact in size, GW series aluminium electrolytic


capacitors are designed for high performance, with their optimised internal construction achieving a high CV (capacity-voltage) product. The advantage is minimal power loss as soon as an electrical load is applied. Since the special design not only saves space but also improves cooling performance, this also reduces costs to the user, the company explains.


A RELIABLE SOLUTION Commenting on the capacitors, R. Winkler, head of purchasing at SCHUMACHER Elektromechanik, said: “Like all MERSEN components, they function with absolute reliability.” Of additional benefit, MERSEN has the ability to meet custom application requirements if needed. “MERSEN produces custom tailored capacitors for several of our applications,” he explained. This versatility is a unique selling proposition in the industry – FTCAP capacitors are the right choice for special applications in small and medium quantities. The special field is ‘customised special solutions’. Furthermore, the company


offers a range of high- quality standard products, but always with the option of adapting them – for example, if a customer needs a normal form with requirements for adaptation of other factors, such as voltage, current, dimension, pulse resistance, and oil resistance.


MERSEN www.mersen.com / DESIGNSOLUTIONS


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