The invention provides a power supply module, a power supply
system composed of the
power module and a control method of the power
system. The
power module comprises a power conversion circuit, a
control circuit, a sampling feedback circuit, a circuit detection circuit, and further comprises at least one comparison
control circuit. The power supply
system comprises N power supply modules in parallel, wherein N is a natural number greater than 1; any one of the power supply modules is used as a main module, and the other N-1 power modules are used as slave modules; a current
signal output by the main module is fed back to the slave module through an
external connection wire; the slave module receives the current
signal of the main module and compares the current
signal with its own output current; the output current of the slave module is kept the same as the output current of the main module by adjusting the output power of the slave module by the slave module, so as to achieve the purpose of parallel
current sharing output of the N power supply modules. The parallel
current sharing modules of the present invention are all identical, and the modules can be directly used in parallelcurrent sharing, without any external devices or equipment added, the
circuit design is simplified, and the reliability of the power supply is improved.