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A voltage converter includes a power switching unit and an indirect sensing circuit. The power switching unit includes a plurality of power switches and a capacitor. The indirect sensing circuit receives an input voltage, a first voltage at a first node of the capacitor, and a second voltage at a se

A voltage converter includes a power switching unit and an indirect sensing circuit. The power switching unit includes a plurality of power switches and a capacitor. The indirect sensing circuit receives an input voltage, a first voltage at a first node of the capacitor, and a second voltage at a second node of the capacitor, and generates first and second sensing output voltages based on the input voltage and the first and second voltages. A voltage difference between the first and second voltages is equal to a fractional multiple of the input voltage.

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1. A voltage converter comprising: a power switching unit comprising a plurality of power switches and a capacitor; andan indirect sensing circuit receiving an input voltage, a first voltage at a first node of the capacitor, and a second voltage at a second node of the capacitor and generating first

1. A voltage converter comprising: a power switching unit comprising a plurality of power switches and a capacitor; andan indirect sensing circuit receiving an input voltage, a first voltage at a first node of the capacitor, and a second voltage at a second node of the capacitor and generating first and second sensing output voltages based on the input voltage and the first and second voltages, wherein a voltage difference between the first and second voltages is equal to a fractional multiple of the input voltage. 2. The voltage converter of claim 1, wherein the indirect sensing circuit includes passive devices and does not include an active device. 3. The voltage converter of claim 1, wherein the indirect sensing circuit includes a resistor network having a plurality of resistors. 4. The voltage converter of claim 1, wherein the fractional multiple of the input voltage is half of the input voltage. 5. The voltage converter of claim 4, wherein the first sensing output voltage corresponds to 1/N (N is a real number greater than 1) times the first voltage, and the second sensing output voltage corresponds to a sum of a voltage of 1/N times the second voltage and a voltage of 1/(2N) times the input voltage. 6. The voltage converter of claim 5, wherein the indirect sensing circuit includes first and second resistors connected between the first node and a ground node, wherein the voltage of 1/N times the first voltage is generated by dividing the first voltage using the first and second resistors. 7. The voltage converter of claim 5, wherein the sum of a voltage of 1/N times the second voltage and the voltage of 1/(2N) times the input voltage is generated based on the input voltage and a resistor network connected to the second node and a ground node. 8. The voltage converter of claim 1, wherein the power switching unit is configured to generate a voltage output having three levels. 9. The voltage converter of claim 1, wherein the power switching unit includes four metal-oxide-semiconductor (MOS) transistors. 10. The voltage converter of claim 9, wherein the first and second sensing output voltages are used in a feedback control to switch the four MOS transistors. 11. A voltage converter comprising: a power switching unit comprising a plurality of power switches and a capacitor;a sensing circuit sensing a voltage between first and second nodes of the capacitor to control the voltage between the first and second nodes to be a fractional multiple of an input voltage; andan auxiliary switching circuit configured to be connected to the first node and configured to charge or discharge the capacitor in response to an auxiliary switching control signal. 12. The voltage converter of claim 11, wherein the fractional multiple of an input voltage is half of the input voltage. 13. The voltage converter of claim 11, wherein the sensing circuit includes a non-inverting input node and an inverting input node, wherein the non-inverting input node is connected to the first node, and the inverting input node is connected to the second node, andwherein the sensing circuit outputs a voltage corresponding to the voltage between the first and second nodes. 14. The voltage converter of claim 11, wherein the auxiliary switching circuit comprises: a first metal-oxide-semiconductor (MOS) transistor including a source terminal to which the input voltage is applied and a drain terminal connected to the first node; anda second MOS transistor including a source terminal connected to the first node and a drain terminal connected to a ground. 15. The voltage converter of claim 14, wherein the first MOS transistor is configured to charge the capacitor when the voltage between the first and second nodes of the capacitor is lower than a first voltage level, and wherein the second MOS transistor is configured to discharge the capacitor when the voltage between the first and second nodes of the capacitor is higher than a second voltage level greater than the first voltage level. 16. A voltage converter comprising: a power switching unit comprising a plurality of power switches and a capacitor;an indirect sensing circuit including a resistor network, two input nodes of the resistor network are respectively connected to first and second nodes of the capacitor, and outputting first and second sensing output voltages through two output nodes of the resistor network, respectively; andan auxiliary switching circuit charging or discharging the capacitor in response to an auxiliary switching control signal,wherein the first sensing output voltage corresponds to a voltage at the first node, and the second sensing output voltage corresponds to a sum of a voltage at the second node and half of an input voltage applied through one end of a first switching circuit of the auxiliary switching circuit. 17. The voltage converter of claim 16, wherein the auxiliary switching circuit includes the first switching circuit and a second switching circuit, and wherein another end of the first switching circuit and one end of the second switching circuit are commonly connected to the first node of the capacitor. 18. The voltage converter of claim 17, wherein another end of the second switching circuit is connected to a ground node. 19. The voltage converter of claim 17, wherein each of the first and second switching circuits is a transistor. 20. The voltage converter of claim 16, wherein the indirect sensing circuit does not include an active device.