Optimization control method for minimum current effective value of two-way half-bridge unilateral tri-level DC-DC converter

A technology of DC-DC and current RMS, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, and can solve the problem of controllable duty cycle of the primary side, circulating power and current without using the primary side. Increased stress, increased switching device and magnetic component losses, etc.

Active Publication Date: 2015-07-15
成都立行企业管理中心(有限合伙) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phase shift control is simple and easy to implement, but it does not take advantage of the controllable duty ratio of the primary side of the half-bridge unilateral three-level DC-DC converter
At the same time, since the inductor current lags behind the voltage during phase-shift control, this leads to power circulation in the input and output directions within one switching cycle (such as image 3 shaded part in
When the input and output voltage amplitudes do not match, the circulating power and current stress will increase greatly, thereby increasing the loss of switching devices and magnetic components, and reducing the efficiency of the converter

Method used

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  • Optimization control method for minimum current effective value of two-way half-bridge unilateral tri-level DC-DC converter
  • Optimization control method for minimum current effective value of two-way half-bridge unilateral tri-level DC-DC converter
  • Optimization control method for minimum current effective value of two-way half-bridge unilateral tri-level DC-DC converter

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Embodiment Construction

[0055] According to the analysis steps of the control method provided in the Summary of the Invention part and the D that meets the control target provided by Table 1 1 about the expression of Figure 5 When k=0.3, 0.5, 0.7, 0.9, D 1 about control curve. The controller implements the specific implementation of the optimal control method proposed in this patent as Figure 7 shown.

[0056] a) The voltage control module of the controller controls the load side voltage (V 2 ) and reference voltage (V 2ref ) error for feedback control, get shift phase

[0057] b), read in the result of a), and obtain the duty ratio D of the primary side bridge arm voltage according to Table 1 1 :

[0058] when in the range of [ - 1 - k 2 , 1 - k 2 ] hour,

[0059] when in...

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Abstract

The invention discloses a two-way half-bridge unilateral tri-level DC-DC converter and an optimization control method for a minimum current effective value. The method realizes the optimization of the minimum current effective value during two-way transmission of power between a primary side and a secondary side by controlling the duty ratio D1 of the neutral-point voltage of a high-voltage side bridge arm and the phase shift ratio between the neutral-point voltage of primary side bridge arm and a secondary side bridge arm. The method gives the steps of solving the minimum current effective value D1, realizes the control of the minimum current effective value in the range of total power, also realizes zero voltage conduction of all switching tubes in the full-load range, and therefore effectively reduces the on-state loss and the switching loss of the converter.

Description

technical field [0001] The invention relates to the structure and control of an isolated bidirectional DC-DC converter, in particular to a bidirectional half-bridge unilateral three-level DC-DC converter and optimal control for minimum effective value of current. Background technique [0002] The isolated bidirectional DC-DC converter is a DC-DC converter that can operate in two quadrants and can realize electrical isolation between the input and output sides. It is widely used in the fields of electric vehicles, new energy power generation and smart grids. [0003] The isolated bidirectional DC-DC converter is more commonly used as a bidirectional full-bridge two-level circuit structure, and its topology is as follows figure 1 As shown, it consists of two symmetrical H-bridges, an intermediate frequency transformer and two DC stabilizing capacitors. This kind of converter has the advantages of simple structure, high power density, large voltage transformation ratio, electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33576H02M3/33592H02M1/0048Y02B70/10
Inventor 舒泽亮况祖杭郭潇潇何晓琼
Owner 成都立行企业管理中心(有限合伙)
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