A power supply module for distribution automation system, the power supply module being connectable in parallel and comprising: a means to connect an input power source to the power supply module and to connect the output of the power supply module to external devices; a regulating means comprising a switching element which is controlled by a voltage error amplifier to regulate an output DC voltage; a rectification module generating the output DC voltage; a transformer having a primary side connected with the regulating means and the one or more power input power source, and the secondary side connected to the rectification module; wherein the switching element is adapted to control the current on the primary side of the transformer; a voltage feedback means for providing a voltage feedback signal; a load share control module responsible for load sharing control having a load share signal for controlling load sharing for the power supply module; wherein, the power supply module is additionally provided with a filter amplifier for conditioning the voltage feedback signal in the voltage control loop, the said filter amplifier being connected on the secondary side of the transformer for reducing the effect of noise in the power supply module, wherein the filter amplifier attenuates the noise due to switching and prevents the noise to go to the voltage error amplifier in the primary side of the regulating means, and amplifies the noise due to 50/60Hz line frequency and variation in load; wherein the output signal of the filter amplifier is combined with an output signal of a load share control loop within the load share control module to form an output signal of the load share control module, the load share control module receiving the load share signal from a load share bus and receiving a load current feedback from the secondary side of the transformer, wherein the output signal of the load share control module is fed into the voltage error amplifier of the regulating means, wherein the power supply module actively makes the load current equal to the load share signal by controlling the regulating means and wherein variations affecting a load share control loop are taken care of only by the low gain provided by the voltage error amplifier on the primary side of the regulating means, and wherein the filter amplifier on the secondary side and the voltage error amplifier on the primary side of the regulating means have a different frequency response to achieve stability over a wide input voltage range and different input power sources for parallel connected power supply modules with equal load sharing. a means to connect an input power source to the power supply module and to connect the output of the power supply module to external devices; a regulating means comprising a switching element which is controlled by a voltage error amplifier to regulate an output DC voltage; a rectification module generating the output DC voltage; a transformer having a primary side connected with the regulating means and the one or more power input power source, and the secondary side connected to the rectification module; wherein the switching element is adapted to control the current on the primary side of the transformer; a voltage feedback means for providing a voltage feedback signal; a load share control module responsible for load sharing control having a load share signal for controlling load sharing for the power supply module; wherein, the power supply module is additionally provided with a filter amplifier for conditioning the voltage feedback signal in the voltage control loop, the said filter amplifier being connected on the secondary side of the transformer for reducing the effect of noise in the power supply module, wherein the filter amplifier attenuates the noise due to switching and prevents the noise to go to the voltage error amplifier in the primary side of the regulating means, and amplifies the noise due to 50/60Hz line frequency and variation in load; wherein the output signal of the filter amplifier is combined with an output signal of a load share control loop within the load share control module to form an output signal of the load share control module, the load share control module receiving the load share signal from a load share bus and receiving a load current feedback from the secondary side of the transformer, wherein the output signal of the load share control module is fed into the voltage error amplifier of the regulating means, wherein the power supply module actively makes the load current equal to the load share signal by controlling the regulating means and wherein variations affecting a load share control loop are taken care of only by the low gain provided by the voltage error amplifier on the primary side of the regulating means, and wherein the filter amplifier on the secondary side and the voltage error amplifier on the primary side of the regulating means have a different frequency response to achieve stability over a wide input voltage range and different input power sources for parallel connected power supply modules with equal load sharing.