Siemens Aktiengesellschaft

Max Kerscher

Armin Kroning

Peter Krummel

Gerhard Stempel

Given a reflector arrangement in a device that is employed for the individual illumination of objects, high demands must be made of the durability of the mirror layers to be applied onto carriers. Considerable difficulties result in satisfying this demand, particularly given large-area reflector arrangements which are exposed to weather. In order to overcome these difficulties, the reflector arrangement is designed with shell carriers of transparent material that are designed tub-shaped and which have a vapor-deposited mirror layer provided on the side of the shell. This mirror layer is durably protected with suitable cover techniques against environmental influences which deteriorate or destroy it.

Reflector arrangement

Converter

An inverter with a dc-source has a charging condenser connected through a charging diode and a charging inductor to the dc-supply. A charging switch is periodically closed by a control component with a variable keying ratio to connect the charging inductor to the dc-supply. The inverter includes an AC voltage converter with two alternatingly controlled switches supplied with power by the charging condenser, hereinbelow identified as the primary switch and the secondary switch, which are in a series circuit in parallel with the charging condenser. In this arrangement, the control component for the charging switch of the charging regulator is synchronized with a square wave voltage at one of the switches of the alternating voltage converter. The charging switch operates at the same switching frequency as the alternating voltage converter. When the square-wave voltage at a switch of the alternating voltage converter terminates during a non-oscillating condition of the alternating voltage converter, then the charging switch of the charging regulator also remains open. At a disruption, there need, accordingly, only be deactivated the inverter.

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Chieming, Germany

Max Kerscher