Non-isolated high-gain DC-DC boost converter

A boost converter, high-gain technology, applied in the direction of high-efficiency power electronic conversion, DC power input conversion to DC power output, instruments, etc., can solve the problems of increasing topology complexity, poor control cycle, large inductor current stress, etc. , to achieve good practical value, small current attraction and high voltage gain

Inactive Publication Date: 2016-10-12
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some documents use the multi-level output of the Boost circuit to achieve high voltage gain, but the premise of achieving high gain is to increase the number of output levels, that is, the number of capacitors must also increase, which greatly increases the complexity of the topology. sex
Some literatures adopt the method of cascading two Boost circuits to achieve high voltage gain, but there is a control cycle difference betwee

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  • Non-isolated high-gain DC-DC boost converter
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Examples

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Example Embodiment

[0032] Example one

[0033] Such as figure 1 , Which shows the connection mode of the non-isolated high-gain DC-DC boost converter topology. The upper end of the switch tube S2 is connected to the upper end of the inductor L2 and directly connected to the positive pole of the DC input power supply; the upper end of the inductor L1 is connected to the lower end of the switch tube S2; the upper end of the switch tube S1 is connected to the lower end of the inductor L2; the lower end of the inductor L1 is connected to the lower end of the switch tube S1 The lower end is connected to the cathode of the DC input power supply; the anode of diode D1 is connected to the lower end of inductor L2, the cathode is connected to the anode of capacitor C1 and the anode of diode D2; the cathode of capacitor C1 is connected to the lower end of switch S2, and the anode is connected to The anode of the diode D2 is connected; the anode of the voltage stabilizing capacitor C2 is connected to the cat...

Example Embodiment

[0043] Example two

[0044] Such as figure 1 , Which shows the connection mode of the non-isolated high-gain DC-DC boost converter topology. The upper end of the switch tube S2 is connected to the upper end of the inductor L2 and directly connected to the positive pole of the DC input power supply; the upper end of the inductor L1 is connected to the lower end of the switch tube S2; the upper end of the switch tube S1 is connected to the lower end of the inductor L2; the lower end of the inductor L1 is connected to the lower end of the switch tube S1 The lower end is connected to the cathode of the DC input power supply; the anode of diode D1 is connected to the lower end of inductor L2, the cathode is connected to the anode of capacitor C1 and the anode of diode D2; the cathode of capacitor C1 is connected to the lower end of switch S2, and the anode is connected to The anode of the diode D2 is connected; the anode of the voltage stabilizing capacitor C2 is connected to the cat...

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Abstract

The present invention belongs to the technical field of electric power and electronics, and in particularly relates to a non-isolated high-gain DC-DC boost converter. A topological unit of the converter comprises an active network, a voltage doubler rectification network, a voltage stabilizing capacitor. The active network is formed by the mutually parallel connection of two modules formed by serial connection of full control switch tubes and inductors. In the voltage doubler rectification network, two diodes are connected in series and in such a manner as a capacitor is arranged between the two diodes to form a three-terminal network. And the positive pole of the voltage stabilizing capacitor is connected with the negative poles of the diodes in the three-terminal network. The negative pole of the voltage stabilizing capacitor is connected to the negative pole of inputted voltage from the active network. The non-isolated high gain DC-DC boost converter provided in the invention can be used in a photovoltaic power generation system so as to make the voltage gain of the DC boost circuit high. With a simple control strategy and small size, small voltage stress of switch tubes in the boost topology and small current attraction can be achieved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a non-isolated high-gain DC-DC step-up converter. Background technique [0002] With the increasing depletion of fossil energy and the pollution of the environment after burning, it has attracted more and more attention from the international community. Searching for new, renewable and non-polluting energy has become an imminent event before human beings. Due to its inexhaustible, clean and non-polluting advantages, photovoltaic power has become a key topic in people's research on future energy demand, with great potential. [0003] Since the direct output DC voltage of the photovoltaic panel in the photovoltaic power generation system is low, generally 33-43V, and for the AC220V mains, even if the full-bridge grid-connected inverter is used, the DC input bus voltage is generally 380V, how Realizing high-gain DC-DC step-up is one of the urgent problems to be solved in...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1584Y02B70/10Y02E10/56
Inventor 董秀成陈庚李浩然代莎
Owner XIHUA UNIV
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