In a display system power supply, what is the purpose of the chopper?

The chopper in a display system power supply serves a crucial role as an electronic switch, specifically between the raw DC output and the inverter. Its primary function is to convert a continuous DC input into a pulsed DC output. This pulsed output is then more easily processed by the inverter to produce the required AC signal for display operations.

By controlling the switching action, the chopper manages the flow of current and can adjust the voltage levels as necessary, allowing for efficient power conversion. This dynamic regulation is essential for adapting to varying load demands in the system, ensuring that the display operates effectively while minimizing energy loss.

The other choices represent functions that are not appropriate for the role of the chopper. For instance, interrupting the AC supply line does not pertain to the chopper's function. Similarly, while regulating output voltage or pre-regulating AC input may be important in power supply design, these processes are typically handled by other components in the system, such as voltage regulators or transformers rather than the chopper itself.