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Resonant circuit tuning system with dynamic impedance matching

A resonant circuit and resonance technology, applied in the field of resonant tuning systems, can solve the problems of increased power, increased cost, unsatisfactory circuit performance, etc.

Active Publication Date: 2009-08-05
TYCO FIRE & SECURITY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Thus, these known tuned circuits often result in increased power requirements and / or increased cost
Furthermore, the performance of these known circuits is unsatisfactory due to the inability to compensate for variations affecting the circuit

Method used

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  • Resonant circuit tuning system with dynamic impedance matching
  • Resonant circuit tuning system with dynamic impedance matching
  • Resonant circuit tuning system with dynamic impedance matching

Examples

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Embodiment Construction

[0015] Considering the simplicity and ease of description, the present invention will be described below in conjunction with various embodiments of the present invention. However, those skilled in the art will recognize that the features and advantages of various embodiments of the invention can be realized in various configurations. Therefore, the embodiments described below are obviously only illustrations of the present invention, rather than limitations of the present invention.

[0016] Various embodiments of the present invention provide resonance tuning systems and methods with dynamic impedance matching. One or more variable or adjustable reactive elements are provided in the resonant circuit. The variable or adjustable reactive element allows adjustment of at least one of the resonant frequency and the effective resonant impedance of the resonant circuit. It should be noted that the resonant circuit tuning system and method may be used in conjunction with any type o...

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PUM

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Abstract

A resonant circuit tuning system and a method for tuning are provided. The resonant circuit tuning system may include a resonant circuit having a first capacitive element in series between a transmitter and an antenna coil and a second capacitive element in parallel with the transmitter and the antenna coil. At least one of the first capacitive element and second capacitive element may be configured to be varied. The resonant circuit tuning system also may include a controller for controlling a variable value of at least one of the first and second capacitive elements.

Description

technical field [0001] This invention relates to electronic tuning systems and, more particularly, to resonant tuning systems with dynamic impedance matching. Background technique [0002] Magnetic fields are used in many electronic systems for various purposes, such as electronic article protection (EAS) systems, radio frequency identification (RFID) systems, metal detectors, magnetic imaging systems, telemetry systems, communication systems, and more. In these various electronic systems, magnetic coils can be used as transmitters that project a magnetic field to the desired sensing region. More specifically, for a transmitter, an efficient method of generating a magnetic field involves the use of a series resonant LCR circuit that presents a low impedance to the transmitter at the transmit frequency. In order to achieve high magnetic field levels from the transmitter's antenna, it is ideal for the transmitter to deliver a high current to the antenna coil. Thus, for high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03J3/20H04B5/48
CPCH03J3/20
Inventor S·E·霍尔R·赫林
Owner TYCO FIRE & SECURITY GMBH
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