Power supply module, power supply system composed thereof, and control method of power supply system

Abstract

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.

Description

technical field [0001] The invention relates to the field of power circuits, in particular to a power module, a power system composed of it and a control method for the power system. Background technique [0002] With the emergence and development of a large number of electronic equipment systems, especially the wide application of communication, computer and automation equipment, the demand for power supply is getting higher and higher. The variety of requirements and the demand for power improvement make the power supply parallel technology develop rapidly. In this case, the output regulated power supplies cannot be directly used in parallel. Parallel current sharing technology must be used to ensure that each module shares the same load current. Otherwise, some parallel modules will run in light-load or no-load mode, while In the case of heavy load or even overload mode, it is very easy to cause damage to the power supply. [0003] Commonly used parallel current sharing ...

AI Technical Summary

Problems solved by technology

Both the external circuit control method and the forced current sharing method use more complex external detection and control circuits, which increases the complexity of the circuit and reduces the reliability of the power supply in many special environments.

[0005] The master-slave control method uses the main power module to control other slave power modules. This working method uses N power modules, one of which (master control unit) works in constant voltage output mode, and the remaining N-1 power modules work In the constant current working mode, the N-1 module power supplies control their own current through the current error signal with the main control unit, so as to achieve the purpose of current sharing. Usually the main control unit is required to have a current signal output function, while the remaining N- One module requires current signal receiving function, which requires separate main power supply and slave power supply to supply power to the main power module and slave power module, which also increases the complexity of the circuit and reduces the applicability of the power supply

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