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An improved non-isolated high boost ratio DC converter and its control method

A DC converter, non-isolated technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problem of small loop impedance, affecting system control and electromagnetic compatibility, and generating peak currents and other problems, to achieve the effects of suppressing current spikes, good system robustness, and rapid dynamic response

Active Publication Date: 2019-03-22
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When capacitors are connected in series to supply power to the load, the equivalent circuit is multiple overvoltage sources connected in series, and the loop impedance is very small, which will generate peak currents and affect system control and electromagnetic compatibility.

Method used

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  • An improved non-isolated high boost ratio DC converter and its control method
  • An improved non-isolated high boost ratio DC converter and its control method
  • An improved non-isolated high boost ratio DC converter and its control method

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] figure 1 It is an I-type high boost ratio converter based on Buck / Buck-Boost derivatives proposed in the prior art. Inductance L 1 Working in a continuous current state, the circuit can be divided into two working states according to the on / off of the switch tube. When the switch tube is turned on, its equivalent circuit is shown in Figure 2(a), and the input power U g is the inductance L 1 charge, capacitor C 1 、C 2 with power supply U g Connected in series as load and output filter capacitor C f power supply; when the switch tube is turned off, its equivalent circuit is shown in Figure 2(b), and the inductance L 1 with the input supply for the capacitor C 1 、C 2 Charging, while the output filter capacitor supplies power to the load.

[0039] Depend on Figure 2a It can be seen that the current path I is the main one when the high-fr...

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Abstract

The invention discloses an improved non-isolated high-boost ratio DC converter and a control method, including an input power supply, the positive pole of the input power supply is connected to two branches, and the first branch passes through the first capacitor and the first two poles. The tube is connected to one end of the load capacitor, the second branch is connected to the other end of the load capacitor through the first inductor and the second capacitor; the second capacitor is connected to the negative pole of the power supply through the second diode, and the second diode is connected to the negative pole of the power supply The connection point is connected to the connection point of the first inductor and the second capacitor through a switch tube, and a third diode is connected between the connection point and the connection point of the first capacitor and the first diode; one end of the load capacitor Or filter inductors are provided at both ends. The invention can effectively suppress the current peak, has good system robustness and rapid dynamic response. It has a broad application prospect in the pre-stage step-up of photovoltaic inverters.

Description

technical field [0001] The invention relates to an improved non-isolated high-boost ratio DC converter and a control method. Background technique [0002] In a photovoltaic power generation system, a photovoltaic panel is a component that converts solar energy into electrical energy, and its output voltage is generally between 25V and 45V, which is far lower than the DC side voltage required by the grid-connected inverter. In the traditional way, in order to meet the voltage required for grid connection, multiple photovoltaic panels are generally connected in series as the input of the inverter. However, due to factors such as differences in photovoltaic panels and partial shading, the output energy of the photovoltaic array is greatly reduced. [0003] In recent years, in order to solve the problem of low output power of photovoltaic panels in series, more and more scholars have proposed to use photovoltaic panels in parallel as the input of the system. Since the output v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/32
CPCH02M1/32H02M3/156H02M1/0038Y02E10/56
Inventor 杜春水王伟
Owner SHANDONG UNIV
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