Method and Apparatus for Controlling LCL Converters Using Asymmetric Voltage Cancellation Techniques

a technology of asymmetric voltage cancellation and lcl converter, which is applied in the field of methods, can solve the problems of conversion loss in transmitter electronics, and achieve the effects of improving efficiency, poor turn off characteristics, and huge diode reverse recovery loss

Inactive Publication Date: 2013-02-14
UTAH STATE UNIVERSITY
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Benefits of technology

The technical effect of this patented method described by Ami et al., which improves the efficiency of an inductively charged system called ILC that uses multiple semiconductor elements connected together through specific voltage cancel techniques. By controlling these methods based upon optimized turning points at which certain components can be turned back into its original position during operation, it reduces loss caused by current reversal flow when there is no load being supplied from another source. Additionally, by implementing a zero voltages pulse width modulator (PWM), ZV controlled synchronous rectification (SR) circuits have improved Insulated Gate Bipolar Transister (IGbt). Overall, this approach helps optimize energy transfer between different sources without reducing overall efficiency due to reduced diodes reverse recoverations.

Problems solved by technology

The technical problem addressed by this patented technology relates to improving wireless chargers used on public transportation cars without physically connecting them to their roads when they are moving around at different speeds.

Method used

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  • Method and Apparatus for Controlling LCL Converters Using Asymmetric Voltage Cancellation Techniques
  • Method and Apparatus for Controlling LCL Converters Using Asymmetric Voltage Cancellation Techniques
  • Method and Apparatus for Controlling LCL Converters Using Asymmetric Voltage Cancellation Techniques

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[0121]It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also, various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art, and are also intended to be encompassed by the following claims.

[0122]An overall design configuration of one embodiment of the apparatus, which has the parameter values shown in FIG. 36, is illustrated in FIG. 37. FIG. 38 is a schematic of the gate drivers. FIG. 39 illustrates a current path through the disclosed system.

[0123]FIG. 40 shows a high level block diagram of one embodiment of the system. The dotted blue line denotes isolation, as the NanoBoard 3000 controller communicates with the rest of the circuit via opto-isolators. FIG. 41 shows a resonant tank of the LCL converter.

[0124]In this embodiment, software provid

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Abstract

A method and apparatus for LCL resonant converter control utilizing Asymmetric Voltage Cancellation is described. The methods to determine the optimal trajectory of the control variables are discussed. Practical implementations of sensing load parameters are included. Simple PI, PID and fuzzy logic controllers are included with AVC for achieving good transient response characteristics with output current regulation.

Description

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Claims

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Application Information

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Owner UTAH STATE UNIVERSITY
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