High-gain Boost converter

Abstract

The invention discloses a high-gain Boost converter which comprises a direct-current voltage source, a switching tube, a first diode, a second diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a load. The voltage gain of the high-gain Boost converter is G=(1+D) / (1-D), and higher voltage gain can be achieved under the condition of lower duty ratio. The voltage stresses of all power devices are (Uin+Uo) / 2, and the voltage stresses of all the capacitors are (Uo-Uin) / 2. Compared with a traditional quadratic Boost converter, the voltage stresses of the switching tube, part of the diodes and the capacitors of the high-gain Boost converter of the invention are reduced to a certain extent under the same working condition, the number of diodesis reduced by one, the system loss, the device model selection difficulty and the device model selection cost are reduced, and the conversion efficiency is improved. The high-gain Boost converter is suitable for application occasions requiring medium boosting capability (the voltage gain G is less than or equal to 9), such as a single-phase UPS and a direct-current micro-grid.

Description

technical field [0001] The present application relates to the field of electrical technology, in particular to a high-gain Boost converter. Background technique [0002] With the gradual depletion of traditional fossil energy, and the increasingly serious problems of environmental pollution and global warming, the development and utilization of new energy with the characteristics of wide distribution of resources, great development potential, small environmental impact, and sustainable use has become more and more popular. people's attention. At present, the new energy power generation systems that are widely used mainly include photovoltaic, wind power, and fuel cell power generation. The output voltage of photovoltaic modules, fuel cells, batteries and other modules is relatively low, generally 30-48V, while the input voltage required by half-bridge / full-bridge grid-connected inverters is usually above 380 / 760V. Connecting multiple photovoltaic cell modules or fuel cells...

AI Technical Summary

Problems solved by technology

Among them, isolated converters or boost converters with coupled inductors have problems such as bulky size, high cost, leakage inductance and parasitic capacitance; Boost converter cascaded systems have two-stage energy conversion, the overall efficiency is low, and the topology and Stability design is more complex

and figure 1 The secondary boost converter shown has the same gain as the cascaded boost converter, and the number of switch tubes is reduced, which reduces the difficulty of system control, but the number of diodes is large, and the voltage stress of power tubes and capacitors Both are large, which increases the difficulty and cost of device selection

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