DC to DC converter and method to transition the DC to DC converter from a buck mode to a boost mode

A method to operate a DC to DC converter including a buck converter, a boost converter, and a control unit, the method comprising:

• providing, by the control unit, an error voltage of the buck converter Verr_buck based on a feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the buck converter Vref_buck;
• providing, by the control unit, an error voltage of the boost converter Verr_boost based on the feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the boost converter Vref_boost, wherein the reference voltage of the boost converter Vref_boost is shifted by an offset Voffset as compared to the reference voltage of the buck converter Vref_buck;
• calculating a control signal to engage and disengage the boost converter based on the error voltage of the buck converter Verr_buck;
• engaging, by the control unit, the boost converter when the error voltage of the buck converter Verr_buck is higher than a threshold voltage Vout_of_range;
• and
• disengaging, by the control unit, the boost converter when the error voltage of the buck converter Verr_buck is lower than the threshold voltage Vout_of_range.

A method to operate a DC to DC converter including a buck converter, a boost converter, and a control unit, the method comprising:

• providing, by the control unit, an error voltage of the buck converter Verr_buck based on a feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the buck converter Vref_buck;
• providing, by the control unit, an error voltage of the boost converter Verr_boost based on the feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the boost converter Vref_boost, wherein the reference voltage of the boost converter Vref_boost is shifted by an offset Voffset as compared to the reference voltage of the buck converter Vref_buck;
• engaging, by the control unit, the boost converter when the error voltage of the buck converter Verr_buck is higher than a threshold voltage Vout_of_range;
• and
• disengaging, by the control unit, the boost converter when the error voltage of the buck converter Verr_buck is lower than the threshold voltage Vout_of_range.