A power supply system, comprising: a plurality of power supply modules (106a, 106b, 106c), each of the plurality of power supply modules (106a, 106b, 106c) having a power output coupled in parallel; each of the power supply modules (106a, 106b, 106c) has a controller (108a, 108b, 108c) for controlling the power output thereof; each controller (108a, 108b, 108c) has a first analog input, a second analog input, a first pulse width modulation output, and a second PWM output; a power averaging circuit receiving signals representing a power output from each power supply module (106a, 106b, 106c) and generating a signal representing an average power of the power provided by the power supply modules (106a, 106b, 106c); wherein the second PWM output is adapted to provide said signal representing the power output of an associated one of the plurality of power supply modules (106a, 106b, 106c) to the power averaging circuit; the second analog input is coupled to the first PWM output through a first low pass filter (224, 228), wherein the first low pass filter (224, 228) is adapted to produce a reference voltage on the second analog input; the first analog input is coupled to the signal representative of the average power desired from each of the plurality of power supply modules (106a, 106b, 106c) generated by the power averaging circuit, and wherein each controller (108a, 108b, 108c) is configured to calculate the difference between the reference voltage and the signal representing the average power and to adjust the power output of its corresponding power supply module (106a, 106b, 106c) according to said difference. a plurality of power supply modules (106a, 106b, 106c), each of the plurality of power supply modules (106a, 106b, 106c) having a power output coupled in parallel; each of the power supply modules (106a, 106b, 106c) has a controller (108a, 108b, 108c) for controlling the power output thereof; each controller (108a, 108b, 108c) has a first analog input, a second analog input, a first pulse width modulation output, and a second PWM output; a power averaging circuit receiving signals representing a power output from each power supply module (106a, 106b, 106c) and generating a signal representing an average power of the power provided by the power supply modules (106a, 106b, 106c); wherein the second PWM output is adapted to provide said signal representing the power output of an associated one of the plurality of power supply modules (106a, 106b, 106c) to the power averaging circuit; the second analog input is coupled to the first PWM output through a first low pass filter (224, 228), wherein the first low pass filter (224, 228) is adapted to produce a reference voltage on the second analog input; the first analog input is coupled to the signal representative of the average power desired from each of the plurality of power supply modules (106a, 106b, 106c) generated by the power averaging circuit, and wherein each controller (108a, 108b, 108c) is configured to calculate the difference between the reference voltage and the signal representing the average power and to adjust the power output of its corresponding power supply module (106a, 106b, 106c) according to said difference.