#CMT# # / CMT# The device has an input unit provided with two input connectors (E1) for connection of 
direct current supply 
voltage unit (Un). 
Voltage measuring devices (R1-R4) are provided for measuring 
voltage between input connectors and output connectors of a boost-converter (12). A 
microcontroller (14) is provided with two inputs (EM1, EM2), which are coupled with 
voltage measuring devices. The micro-controller is designed such that voltage (Uzw) between output connectors of the converter is controlled to a value, which depends upon a value of voltage (Ugl) between the input connectors of converter. #CMT#USE : # / CMT# Electronic pre-switching device for operation of two different types of 
discharge lamps. #CMT#
ADVANTAGE : # / CMT# The micro-controller is designed such that voltage between output connectors of the 
boost converter is controlled to the value, which depends upon the value of voltage between the input connectors, thus operating the pre-switching device at reduced power losses, and reducing electronic interferences, during operation of the 
discharge lamps. The device is designed such that the voltage 
stroke between the input and the output of the 
boost converter is reduced, thus increasing the efficiency of the converter, and reducing 
power load in all components of the pre-switching device such that compact components are used in the pre-switching device, and hence reducing the cost and space required for the pre-switching device. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a 
schematic circuit diagram of an electronic pre-switching device. E1 : Input connectors EM1, EM2 : Inputs R1-R4 : 
Voltage measuring devices Ugl, Uzw : 
Voltage Un : 
Direct current supply voltage unit 12 : Boost-converter 14 : 
Microcontroller.