Patent ID: 7884585

Claim:
A control circuit for controlling the output voltage V 1 +−V 1 − of a connected voltage converter, comprising: a connection to said voltage converter output for receiving a first voltage V 1 +−V 1 − produced by the voltage converter; impedances arranged to divide the first voltage V 1 +−V 1 − into a first signal V 2 and a second signal V 3 , wherein V 2 >V 3 ; a compensator network comprising a first amplifier with a first signal input for receiving said first signal V 2 , a second signal input for receiving a reference voltage Vref, and arranged to compare the first signal V 2 with the reference voltage Vref and produce at an output a comparison signal for controlling the voltage level V 1 of the voltage converter; a capacitor having a first side connected to the lowest potential of the circuit, having a second side connected to an a resistor for receiving a charging current via the resistor, further on the second side connected to the first signal input of the first amplifier, and being arranged for stabilizing the reference voltage Vref; a comparator circuit comprising a second amplifier with a first signal input receiving the reference signal Vref and, a second signal input receiving the second signal V 3 , and arranged for comparing the second input signal V 3 with the reference signal Vref and increase the reference signal Vref at its output if Vref<V 3 .