Bi-directional voltage positioning circuit, voltage converter and power supply device including the same

A voltage converter comprising:

• a current sensor configured to sense a current flowing through an output coil connected between a switching node and an output node to provide a sensing voltage based on the sensed current;
• a bi-directional voltage positioning circuit (BVPC) configured to generate a second current and a third current to provide a feedback node with one of the second current and third current according to a characteristic of a load connected to the output node, an output voltage of the output node being divided at the feedback node, the second and third currents being real number multiple of a first current, the first current being converted based on the sensing voltage;
• a switching control circuit configured to generate first and second driving control signals based on a feedback voltage and a reference voltage, the feedback voltage being obtained by dividing the output voltage;
• and
• a switching device unit configured to charge an input power supply voltage in the output coil or to discharge the output coil in response to the first and second driving control signals, wherein the BVPC comprises:
• a voltage to current converter configured to convert the sensing voltage to the first current;
• a current mirror circuit configured to mirror the first current to generate the second current and the third current, the second current being N times greater than the first current, the third current being M times greater than the first current, N and M being real numbers greater than zero;
• and
• a switch configured to provide the feedback node with one of the second current and third current in response to a switching control signal.