Buck regulator with plural outputs

A circuit comprising a first capacitor;

• a first inductor;
• a controlled switch for supplying current, when the switch is closed, via the first inductor to the first capacitor for charging the first capacitor to a first output voltage;
• a first freewheel device for maintaining current via the first inductor when the switch is opened;
• a second inductor inductively coupled to the first inductor;
• a second capacitor and a second device coupled to the second inductor for supplying current to the second capacitor for charging the second capacitor to a second output voltage when the switch is closed;
• and a further capacitor coupled between the first and second inductors for allowing current to flow in the second inductor for charging the second capacitor when the second device is non-conductive.

A buck regulator providing two outputs, comprising:

• a pulsed input supply;
• a first inductor directly coupled to said pulsed input supply;
• a second inductor;
• a first output capacitor coupled to the output of said first inductor;
• a second output capacitor coupled to the output of said second inductor;
• first device means for allowing current to flow in said first inductor for charging said first output capacitor during intervals between pulses of said pulsed input supply;
• second device means for allowing current to flow in said second inductor for charging said second output capacitor during intervals between pulses of said pulsed input supply;
• inductive coupling means for inductively coupling said first and said second inductors;
• and
• capacitive coupling means for allowing current flow in said second inductor for charging said second capacitor during pulses of said input supply.