Spezial-Transformatoren-Stockach GmbH and Co. KG is a German medium-sized enterprise with a company tradition stretching back over more than 35 years. The company´s head office and production site are at Stockach am Bodensee (lake of Constance). Our success is based on the consistent expansion of our expertise, which we apply systematically in the market segments defined. STS sees itself as a specialist in the development and manufacture of innovative products, focussing on engineering and optimisation. The company exclusively produces customised inductive components for the electronics industry. These are normally transformers and inductors in the medium frequency range which are subject to special requirements. The following physical ranges are covered: up to 1.000.000 VA (1 MVA) up to 10.000 A (10 kA) up to 60.000 V (60 kV) from 1.000 Hz to 1.000.000 Hz (1 kHz to 1 MHz) At Intersolar 2009 we will be focussing on the following topics: - sinusoidal chokes with modular core concept and low-capacitive winding - power chokes for step-up/step-down converter technology with optimized efficiency in partial-load condition - power transformers for galvanic insulation in middle frequency technology for solar converter applications