Flow-equalizing control circuit and control method of interleaved series direct current (DC) / DC converter

Abstract

The invention discloses a flow-equalizing control circuit and a control method of an interleaved series direct current (DC) / DC converter. The circuit and the method are high in stability. The flow-equalizing control circuit of the interleaved series DC / DC converter comprises an input DC voltage, a plurality of DC / DC modules, a filtering circuit, a load and a control circuit, wherein the DC / DC modules comprise switch circuits; and the control circuit comprises a comparison circuit, a signal processing circuit and a driving circuit. Under the condition of no addition of other hardware circuits, the flow-equalizing control circuit controls an external pipe in the switch circuit after central processing units (CPU) (the comparison circuit and the signal processing circuit) performs signal processing on output currents (I1 and I2) of the DC / DC modules, so the equalization of parallel output currents is well realized, and current stability is good; and the invention is particularly applicable to flow-equalizing control of the DC converter which inputs a high voltage and outputs a low voltage and a large current.

Description

technical field [0001] The invention relates to a current equalization control circuit and a control method of an interleaved series DC / DC converter. Background technique [0002] At present, high-voltage input, low-voltage, and high-current output DC / DC converters are widely used in many fields such as communication power supplies, alkali metallurgical industry, and aerospace power systems. In order to realize the output of large current, it is generally realized by interleaved parallel connection. Since each module shares the total output power equally, the design of single module and system is simpler, and the reliability of the whole system is improved; however, the module When running in staggered parallel connection, due to the difference in parameters, the output current cannot be completely the same, resulting in the overload of some modules and the overload of some modules, which reduces the stability of the entire system, thus making the output current of the stagg...

AI Technical Summary

Problems solved by technology

In order to realize the output of large current, it is generally implemented in a staggered parallel connection. Since each module shares the total output power equally, the design of a single module and the system are simpler, and the reliability of the entire system is improved; however, the module When running in staggered parallel connection, due to the difference in parameters, the output current cannot be exactly the same, resulting in some modules being overloaded and some modules being under light load, which reduces the stability of the entire system, thus making the output current of the staggered parallel modules Achieving current sharing is a problem that must be solved to improve the stability of interleaved parallel DC / DC converters

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