A power supply comprising a plurality of voltage converters, wherein each voltage converter comprises: a converter module configured to convert an input voltage (Vin) to an output voltage (Vout); a current sharing terminal configured to be connected with a current sharing terminal of each of at least one other voltage converter; and a control circuit configured to: generate a first voltage signal proportional to an output current (Iout) of the converter module with an adjustable first proportional coefficient (K, K'); wherein the first proportional coefficient (K, K') is selected based on whether the voltage converter is a master voltage converter or a slave voltage converter in a current sharing mode; generate a first current signal proportional to a second voltage signal (Vlshare) at the current sharing terminal with a second proportional coefficient, wherein a unidirectional conductive device of said voltage converter is configured to generate the second voltage signal (Vlshare) at the current sharing terminal from said first voltage signal, and wherein the second voltage signal (Vlshare) is a largest voltage signal among the first voltage signal and the voltage signal from the current sharing terminal and the first proportional coefficient (K, K') is less than or equal to a reciprocal of the second proportional coefficient; subtract the output current (Iout) of the converter module from the first current signal so as to generate an error current signal (Ierr); and adjust the output voltage (Vout) of the converter module based on the error current signal (Ierr), wherein the first proportional coefficient (K, K') is less than the reciprocal of the second proportional coefficient in response to the voltage converter being the slave voltage converter; and a value of the first proportional coefficient (K, K') is equal to a reciprocal value of the second proportional coefficient in response to the voltage converter being the master voltage converter. a converter module configured to convert an input voltage (Vin) to an output voltage (Vout); a current sharing terminal configured to be connected with a current sharing terminal of each of at least one other voltage converter; and a control circuit configured to: generate a first voltage signal proportional to an output current (Iout) of the converter module with an adjustable first proportional coefficient (K, K'); wherein the first proportional coefficient (K, K') is selected based on whether the voltage converter is a master voltage converter or a slave voltage converter in a current sharing mode; generate a first current signal proportional to a second voltage signal (Vlshare) at the current sharing terminal with a second proportional coefficient, wherein a unidirectional conductive device of said voltage converter is configured to generate the second voltage signal (Vlshare) at the current sharing terminal from said first voltage signal, and wherein the second voltage signal (Vlshare) is a largest voltage signal among the first voltage signal and the voltage signal from the current sharing terminal and the first proportional coefficient (K, K') is less than or equal to a reciprocal of the second proportional coefficient; subtract the output current (Iout) of the converter module from the first current signal so as to generate an error current signal (Ierr); and adjust the output voltage (Vout) of the converter module based on the error current signal (Ierr), wherein the first proportional coefficient (K, K') is less than the reciprocal of the second proportional coefficient in response to the voltage converter being the slave voltage converter; and a value of the first proportional coefficient (K, K') is equal to a reciprocal value of the second proportional coefficient in response to the voltage converter being the master voltage converter. generate a first voltage signal proportional to an output current (Iout) of the converter module with an adjustable first proportional coefficient (K, K'); wherein the first proportional coefficient (K, K') is selected based on whether the voltage converter is a master voltage converter or a slave voltage converter in a current sharing mode; generate a first current signal proportional to a second voltage signal (Vlshare) at the current sharing terminal with a second proportional coefficient, wherein a unidirectional conductive device of said voltage converter is configured to generate the second voltage signal (Vlshare) at the current sharing terminal from said first voltage signal, and wherein the second voltage signal (Vlshare) is a largest voltage signal among the first voltage signal and the voltage signal from the current sharing terminal and the first proportional coefficient (K, K') is less than or equal to a reciprocal of the second proportional coefficient; subtract the output current (Iout) of the converter module from the first current signal so as to generate an error current signal (Ierr); and adjust the output voltage (Vout) of the converter module based on the error current signal (Ierr), wherein the first proportional coefficient (K, K') is less than the reciprocal of the second proportional coefficient in response to the voltage converter being the slave voltage converter; and a value of the first proportional coefficient (K, K') is equal to a reciprocal value of the second proportional coefficient in response to the voltage converter being the master voltage converter.