A Control Method for Realizing Low Voltage Switch Stress

Abstract

The invention discloses a control method for realizing the low-voltage switch stress of a boosted circuit. The boosted circuit comprises an input power supply, switching elements S1 and S2, diodes D1 and D2, an inductor L, an input capacitor C1, an intermediate capacitor C2, and an output capacitor Co. The input power supply generates an input voltage Vin; and the switching elements S1 and S2 are respectively provided with parasitic capacitors CS1 and CS2. According to the control method, turning on and off of the switching elements S1 and S2 are controlled, so that the boost function is realized and the voltage drops between the collectors and emitters of the switching elements S1 and S2 can be substantially reduced based on comparison with the prior art. No energy-consuming element exists in the circuit; and the work efficiency of the converter is improved.

Description

technical field [0001] The invention relates to a control method of a DC-DC converter, in particular to a control method for realizing the low-voltage switch stress of a boost circuit. Background technique [0002] In a solar power generation system or a fuel cell system, since a single solar cell or a single fuel cell provides direct current with a low voltage, it cannot meet the electricity demand of existing electrical equipment, nor can it meet the requirements of grid connection. It is necessary to convert the low-voltage direct current into the actually required high-voltage direct current. Therefore, the boost converter with high gain and stable performance has become a research hotspot, which is of great significance to promote the development of photovoltaic and fuel cell industries. [0003] The most basic boost converter is a single-transistor Boost converter. However, the boost range of this converter is very limited, it is difficult to meet the conversion requi...

AI Technical Summary

Problems solved by technology

At this time, the conversion process of electric energy is actually changed from the original DC-DC to DC-AC-AC-DC, and the energy conversion efficiency of the whole system is reduced.

[0006] The second is to use coupled inductors, but the structure of coupled inductors is complex, which is not conducive to industrial processing, it is difficult to ensure the consistency of the circuit, and it will cause excessive voltage stress of switching devices, which will bring electromagnetic interference and other effects, resulting in large operating losses of the converter.

[0007] The third is to add cascaded boost units, the more units, the greater the voltage gain, but the more circuit components, the more complex the structure

However, this boost circuit requires too many components such as switches, capacitors, and diodes, resulting in a complex circuit structure and high cost.

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