Patent ID: 7015748

Claim:
A DC-DC converter circuit ( 1 ) comprising a converter unt ( 2 ) for converting an input voltage (V E′ ) applied to an input of the converter unit into an output voltage (V A ) having a predetermined value; a first capacitor ( 5 ) for maintaining a value of the output voltage (V A ) for a predetermined time interval when the input voltage applied to the input of the converter unit ( 2 ) is interrupted; a charging circuit ( 4 ) for charging the first capacitor ( 5 ) with a supply voltage (V E ) that is larger than the input voltage, wherein each of the input voltage (V E′ ), the output voltage (V A ), and the supply voltage (V E ) is a DC-voltage; and a discharging circuit for charging the converter unit ( 2 ) with charge from the first capacitor ( 5 ) when the input voltage (V E′ ) is interrupted, whereby the value of the output voltage (V A ) is maintained for the predetermined time interval.