Quadratic high-gain boost converter with continuous input current

Abstract

The invention relates to a quadratic high-gain boost converter with a continuous input current, comprising an input boost module, a voltage conversion module and a rectifier filter output module, specifically comprising a first switching tube S1, a second switching tube S2, a first inductance L1, a second inductance L2 or transformer T, a first diode D1, a second diode D2, a first capacitor C1 anda second capacitor C2, and comprising a non-isolated topological structure or an isolated topological structure. The quadratic high-gain boost converter provided by the invention can realize non-isolated boost of an output voltage and also can realize isolated boost of the output voltage, thereby being applicable to an occasion that a high voltage needs to be output in a boost mode.

Description

technical field [0001] The invention relates to a square high-gain step-up converter with continuous input current, in particular, it is suitable for occasions where a positive voltage is output and a step-up conversion is required, especially for occasions where a higher voltage needs to be output in a step-up mode. Isolation conversion, also capable of isolation conversion, belongs to the technical field of switching power converters. Background technique [0002] As an essential part of the active stand-alone satellite payload, the on-board power supply is widely used in satellite systems of different platforms including Tiantong series satellites, Fengyun series satellites, and Ocean series satellites. [0003] Satellite payloads are generally composed of two parts: functional loads and on-board power supplies (EPC). The functional loads include solid-state power amplifiers, traveling wave tube power amplifiers, receivers, frequency converters, and digital processing equ...

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Problems solved by technology

[0005] When the post-stage load is a power amplifier, there are mainly the following problems now: 1. When using a non-isolated topology for cascading and isolating two-stage cascading, when the bus range is low (such as the lowest bus of the existing platform is 13V), with The increase in the voltage required by the post-stage load is limited by the gain of the pre-stage non-isolated converter. The turn ratio of the power isolation transformer is very large, and the ensuing problem is that the copper loss increases. The inter-electrode capacitance and inter-electrode inductance of the transformer also increase, which will cause unpredictable common state conduction and voltage and current spikes and other electromagnetic interference problems; 2. When using a single-stage isolated topology, when the turn ratio is 1 , the output voltage is generally proportional to the duty cycle, that is, the output voltage cannot be higher than the input voltage. Also in the case of low bus range and high load voltage requirements, the turn ratio of the power isolation transformer is very different.

The earliest appeared is the boost circuit, its gain is 1 / (1-D), the gain is not high enough

Later scholar Rodrigo et al. mentioned in literature 6. "Family of quadratic step-up dc-dc converters based on non-cascading structures," (IET Power Electron.Vol.8, Iss.5, pp.793-801, 2015.) There are two types of boost circuits, but their disadvantages are that the gain of the two tubes is limited when they are controlled in phase or complementary, and they cannot be isolated

Scholar Pan et al. in literature 7. "A novel transformer-less adaptable voltage quadruoler DCconverter with low switch voltage stress," (IEEE Trans.Power Electron.,vol.29,no.9,pp.4787-4796,Sep.2014. ) proposed a high-gain Boost circuit with a gain of 4 / (1-D), but its output is floating, and the number of semiconductor devices and passive components required is as many as 6

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