Continuous Current Mode
Continuous Current Mode (CCM, literally "continuously flowing current", dt. "Non-intermittent operation") is a characteristic of DC converters , clocked power supplies, switching regulators and switched-mode power supplies .
Here, the current flow through during normal operation choke of the converter (high and low boost converter, forward converter ) or by the storage transformer of a flyback converter (Engl. Flyback Converter) to zero before. This means that there is no discontinuous operation.
advantages
- The choke can be operated with a high current up to its thermal load limit. This can reduce the costs for a DC chopper solution.
- The choke is operated in the linear range, which means that a small signal analysis (AC analysis ) is possible during the design .
- The magnetic reversal losses in the core of the choke are low.
- The ripple of the output current in the buck converter and the flux converter is low.
- The ripple of the input current in the step-up converter and the flyback converter is less than in intermittent operation .
disadvantage
- Switching losses both when switching off and when switching on, since the switching process is not de-energized.
- Stability problems, especially with the boost topology .