Patent ID: 8994286
Filing Date: 2015-03-31
Classification: H02M,H05B,Y02B

Abstract:
1. An operating device ( 3 ) for a lamp having a power factor correction circuit ( 2 ), the operating device comprising an input terminal ( 4 ) for receiving an input voltage (Vin), an inductance ( 7 ), which is coupled to the input terminal ( 4 ), a controllable switch ( 13 ), which is coupled to the inductance ( 7 ), and which charges or discharges the inductance ( 7 ) by closing or opening, an output terminal ( 5 ) for outputting an output voltage (Vout), and a control unit ( 14 ) for actuating the switch ( 13 ), wherein the control unit ( 14 ) is configured such that the control unit ( 14 ) determines a switch-on time (Ton) for switching on the switch ( 13 ) depending on the output voltage (Vout) and actuates the switch ( 13 ) in accordance with either at least a first operating mode or a second operating mode, the control unit ( 14 ) is configured such that the control unit ( 14 ) actuates the switch ( 13 ) depending on the duration of the determined switch-on time (Ton) in accordance with either the first operating mode or the second operating mode, wherein the control unit ( 14 ) is configured in such a way that the control unit ( 14 ) determines the switch-on time (Ton) for the switch ( 13 ) based on a comparison of a setpoint switch-on time determined depending on the output voltage and a minimum switch-on time (Ton min ).