4.4. Control Modes

The SLx Series have one control mode called Auto-Crossover that is described in detail in Auto-Crossover Mode. This mode is automatically activated as soon as the SLx Series is enabled.

4.4.1. Auto-Crossover Mode

In auto-crossover, set-points define levels at which regulation states change. Whichever feedback error becomes negative, the corresponding regulation is activated.

As an example of auto-crossover, consider open-circuit condition. The starting regulation state for the SLx Series is current regulation. The feedback current error will never become negative, causing the output to rise in voltage, and eventually surpassing the voltage set-point and regulation crossover to voltage regulation.

Fig. 4.5 Auto-Crossover example where the power set-point is below the product of the voltage and current set-points, allowing a crossover into power regulation from either voltage or current regulation.

Fig. 4.6 Auto-Crossover example where the power set-point is above the product of the voltage and current set-points, so the unit alternates only between voltage and current regulation.