Voltage conversion device comprising at least two voltage converters, each voltage converter comprising: - an isolated DC/DC converter circuit having switches (M31, M32), opening and closing sequences of which with a duty cycle (α) make it possible to transmit power through the isolated DC/DC converter; and - a regulation circuit for regulating the input voltage of the isolated DC/DC converter circuit; and wherein the regulation circuit and the isolated DC/DC converter circuit are configured such that: - over a first input-output operating range of the converter, the regulation circuit controls the output voltage (Vout) of the isolated DC/DC converter circuit by modifying the voltage delivered to the isolated DC/DC converter circuit, the duty cycle of the isolated DC/DC converter circuit remaining substantially equal to a first value (α const); and, - over a second input-output operating range of the converter, the isolated DC/DC converter circuit controls its output voltage (Vout) by modifying its duty cycle when the input voltage (Ue) of the converter is higher than or equal to a threshold Vmax and the desired voltage at the output of the converter is lower than or equal to a threshold Vmin, the voltage converter comprising, in addition, at least a first and a second isolation transformer in series, the switches (M31, M32) making it possible to transmit power through the isolated DC/DC converter via the isolation transformers (T1, T2), and a magnetizing inductance of at least one isolation transformer (T1, T2) being configured such that, at the first duty cycle value (α const), a magnetizing current flowing through the transformer (T1, T2) allows soft switching of the switches (M31, M32) of the isolated DC/DC converter, the at least two converters being interlocked; in which device the regulation circuits are configured to operate with a phase difference of 2π/n, and the isolated DC/DC converter circuits are configured to operate with a phase difference of n/n, n being the number of interlocked voltage converters; and wherein the voltage converters share a single circuit intended to implement a first loop, so as to servocontrol a setpoint (I2cons) of an electrical parameter of a signal of the regulation circuit to a difference between the value (Vout_mes) of the output voltage of the isolated DC/DC converter circuit and an output voltage setpoint (V*) of the isolated DC/DC converter circuit, the setpoint (I2cons) of the electrical parameter being such that the regulation circuit delivers, to the isolated DC/DC converter circuit, an input voltage value corresponding to a respective output voltage value of the isolated DC/DC converter circuit, such that the regulation circuits receive the same setpoint (I2cons). - an isolated DC/DC converter circuit having switches (M31, M32), opening and closing sequences of which with a duty cycle (α) make it possible to transmit power through the isolated DC/DC converter; and - a regulation circuit for regulating the input voltage of the isolated DC/DC converter circuit; - over a first input-output operating range of the converter, the regulation circuit controls the output voltage (Vout) of the isolated DC/DC converter circuit by modifying the voltage delivered to the isolated DC/DC converter circuit, the duty cycle of the isolated DC/DC converter circuit remaining substantially equal to a first value (α const); and, - over a second input-output operating range of the converter, the isolated DC/DC converter circuit controls its output voltage (Vout) by modifying its duty cycle when the input voltage (Ue) of the converter is higher than or equal to a threshold Vmax and the desired voltage at the output of the converter is lower than or equal to a threshold Vmin, the voltage converter comprising, in addition, at least a first and a second isolation transformer in series, the switches (M31, M32) making it possible to transmit power through the isolated DC/DC converter via the isolation transformers (T1, T2), and a magnetizing inductance of at least one isolation transformer (T1, T2) being configured such that, at the first duty cycle value (α const), a magnetizing current flowing through the transformer (T1, T2) allows soft switching of the switches (M31, M32) of the isolated DC/DC converter, the at least two converters being interlocked; in which device the regulation circuits are configured to operate with a phase difference of 2π/n, and the isolated DC/DC converter circuits are configured to operate with a phase difference of n/n, n being the number of interlocked voltage converters; and wherein the voltage converters share a single circuit intended to implement a first loop, so as to servocontrol a setpoint (I2cons) of an electrical parameter of a signal of the regulation circuit to a difference between the value (Vout_mes) of the output voltage of the isolated DC/DC converter circuit and an output voltage setpoint (V*) of the isolated DC/DC converter circuit, the setpoint (I2cons) of the electrical parameter being such that the regulation circuit delivers, to the isolated DC/DC converter circuit, an input voltage value corresponding to a respective output voltage value of the isolated DC/DC converter circuit, such that the regulation circuits receive the same setpoint (I2cons).