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LC input series connection output parallel connection direct current transformer with power capable of being adjusted and control method thereof

A DC transformer, series output technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, control/regulating systems, etc., can solve problems such as unfavorable filter design, and achieve the control method is easy to implement and modular. High and easy to promote and apply

Active Publication Date: 2019-04-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the series resonant converter is that the voltage transfer gain curve is approximately a horizontal line at no-load, in order to adjust the output voltage, the switching frequency needs to be changed significantly, which is not conducive to the design of the filter

Method used

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  • LC input series connection output parallel connection direct current transformer with power capable of being adjusted and control method thereof
  • LC input series connection output parallel connection direct current transformer with power capable of being adjusted and control method thereof
  • LC input series connection output parallel connection direct current transformer with power capable of being adjusted and control method thereof

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Embodiment

[0070] The following is an ISOP DC transformer composed of two LC converter modules and an auxiliary bridge arm (such as figure 2 shown) as an example, and in conjunction with the simulation results to illustrate the working principle of the technical solution of the present invention. The simulation parameters are as follows:

[0071] Simulation main parameters

[0072]

[0073] figure 2 For the topology structure diagram of the ISOP DC transformer including the two modules of the auxiliary bridge arm, see image 3 For the control method, the driving signal of the converter is given according to the control method of the premise, that is, the LC resonant converter adopts a 50% duty ratio open-loop control mode, and the auxiliary bridge arm adopts a single-transistor open mode. Figure 4 The main working waveforms of the LC resonant converter module under the corresponding driving signals are given.

[0074] At this time, the power is transmitted in the forward direct...

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Abstract

The invention discloses a LC input series connection output parallel connection direct current transformer with power capable of being adjusted and a control method thereof. The LC input series connection output parallel connection direct current transformer comprises a plurality of LC resonant converter modules and an auxiliary power control bridge arm, wherein an LC resonant circuit open loop works at the resonant frequency to realize zero current on and off. When the power is transmitted in the forward direction, an upper tube of the auxiliary bridge arm is continuously turned off, a diodeis utilized for freewheeling, and a lower tube of the auxiliary bridge arm is turned on at a certain duty ratio; and when the power is transmitted in the reverse direction, the lower tube of the auxiliary bridge arm is continuously turned off, the diode is utilized for freewheeling, and the upper tube of the auxiliary bridge arm is turned on at a certain duty ratio. The power of the whole direct current transformer can be adjusted by adjusting the duty ratio of the upper tube or the lower tube of the auxiliary bridge arm, and thus the power can be adjusted without frequency conversion.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a power-adjustable LC input series output parallel DC transformer and a control method. Background technique [0002] As an important branch of power electronics integration technology, the multi-converter series-parallel system has been a research hotspot in recent years. Since the multi-module series-parallel system has the advantages of reducing development difficulty, facilitating expansion, realizing system redundancy, and high reliability, it is widely used in systems such as distributed power generation, power electronic transformers, and uninterruptible power supplies. For multi-converter series-parallel systems, systems with different series-parallel combinations are used in different situations. Taking the ISOP system as an example, it is suitable for high voltage input and high current output occasions. For example, high-power DC switching power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/088
CPCH02M1/088H02M3/33576H02M1/0074Y02B70/10
Inventor 陈武姚金杰薛晨炀
Owner SOUTHEAST UNIV
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