Maximum efficiency tracking DC-DC converter applied to inductive power transmission system and control method thereof

An inductive power transmission, DC-DC technology, applied in the output power conversion device, the conversion of DC power input to DC power output, the conversion of AC power input to DC power output, etc. Limited range, inability to achieve dynamic tracking, etc., to achieve the effect of improving applicability, high power level, and reducing voltage and current stress

Active Publication Date: 2019-12-10
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Passive impedance matching is to use the inductor-capacitor impedance adjustment network to achieve the equivalent of a fixed load point, and dynamic tracking cannot be achieved
Active impedance matching means that when working at a fixed frequency, the Buck converter is used to

Method used

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  • Maximum efficiency tracking DC-DC converter applied to inductive power transmission system and control method thereof
  • Maximum efficiency tracking DC-DC converter applied to inductive power transmission system and control method thereof
  • Maximum efficiency tracking DC-DC converter applied to inductive power transmission system and control method thereof

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Embodiment Construction

[0027] Further describe the present invention below in conjunction with accompanying drawing:

[0028] Such as figure 1 , a maximum efficiency tracking DC-DC converter and its control technology applied in the inductive power transfer system. The main circuit topology is the main circuit of inductive power transfer and the main circuit of impedance matching. The former is mainly composed of loosely coupled transformers and L 1 、C 1 、C s and the coupler self-inductance L p , L s The LCL-S compensation topology composed of the switching tube Q 1 -Q 4 A full-bridge inverter circuit composed of a diode D 1 -D 4 The uncontrolled rectifier bridge and filter capacitor C f composition. Among them, the inverter circuit switch tube Q 1 and Q 2 , Q 3 , Q 4 Both are 180° complementary conduction, the duty cycle is fixed at 0.5, and the switching tube Q 1 and Q 2 Composed of the leading arm LegA and composed of Q 3 , Q 4 The phase angle between the formed lagging bridge ar...

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Abstract

The invention belongs to the power transmission field and discloses a maximum efficiency tracking DC-DC converter applied to an inductive power transmission system and a control method thereof. The converter comprises an LCL-S compensation topology, an uncontrolled rectifier bridge and a double-tube Buck-Boost circuit. Output of the LCL-S compensation topology is connected with input of the uncontrolled rectifier bridge, and the output of the uncontrolled rectifier bridge is connected with the input of the double-tube Buck-Boost circuit. In the invention, inductive power transmission constantvoltage control is realized by adjusting a phase shift angle between leading and lagging bridge arms of a full-bridge inverter circuit, impedance matching is realized through controlling a DSBB switching tube by adopting a staggered duty ratio bias modulation strategy, and an equivalent load at an output side of a rectifier bridge is always kept at a maximum efficiency load point. According to theinvention, a double-tube structure can effectively reduce a voltage and current stress of the switching tube so that system output has a wider voltage range and a higher power level. Through adjustment of a buck-boost mode, an adjustable range of a load of the system is wider when the system achieves maximum efficiency tracking, and applicability of the system is greatly increased.

Description

technical field [0001] The invention belongs to the field of electric energy transmission, and in particular relates to a maximum efficiency tracking DC-DC converter applied to an inductive electric energy transmission system and a control method thereof. Background technique [0002] Traditional power transmission methods such as sockets have the characteristics of hot plugging, which are prone to safety hazards such as electric sparks. Electrical isolation cannot be achieved, and maintenance costs are high. It is difficult to meet the needs of application scenarios such as electric vehicles, mine power supply, and underwater charging. Therefore, It is necessary to realize efficient inductive power transfer. How to improve the efficiency in the process of power transmission, reduce the transmission loss, and save the use cost is particularly important. [0003] According to the different forms of relay energy in the energy transmission process, wireless energy transmission...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/5387H02M3/158H02J50/10
CPCH02M3/1582H02M3/1584H02M3/33553H02M7/53871H02J50/10H02M3/1586
Inventor 游江程连斌张镠钟彭辉李晓旭周玮王西贝
Owner HARBIN ENG UNIV
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