| 摘要 |
The invention relates to a microcontroller (MC) having at least one device (G) for generating pulse-width modulated or frequency modulated control signals for a switched-mode power supply. According to the invention, this device (G) has a device (SQ1, SS1) for the alternate charging and discharging of an electric charge store (C27) that can be connected to the microcontroller (MC), control means for this device (SQ1, SS1) for controlling the charging and discharging operations, and evaluation means in order to evaluate the time periods which are needed for the individual charging and discharging operations; to generate pulse-width modulated or frequency modulated control signals. The microcontroller (MC) according to the invention generates finely graduated, frequency modulated or pulse-width modulated control signals which are independent of the operating cycle frequency of the microcontroller (MC). The invention further relates to a switched-mode power supply having such a microcontroller (MC) and an electronic ballast for operating at least one electric lamp, and also to an operating method for electric lamps. The frequency modulated or pulse-width modulated control signals for the inverter transistors (V2, V3), for the step-up converter transistor (V1) and for the transistor (V4) of the lamp electrode heating device of the ballast are generated directly by the microcontroller (MC). |
