Electronic preswitching device for operating at least two types of discharge lamps

摘要

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.