Impedance matching network and design method thereof

An impedance matching network and impedance matching technology, which is applied in the direction of impedance network, multi-terminal pair network, electrical components, etc., can solve the problems that the impedance matching effect of the system cannot be guaranteed, and achieve satisfactory harmonic suppression performance and ensure stability.

Active Publication Date: 2012-05-16
RONGHAI SUPERSONIC MEDICINE EN
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Problems solved by technology

Since the existing matching network design method can only consider the harmonic suppression performance, when the impedance of the ultrasonic tran

Method used

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  • Impedance matching network and design method thereof
  • Impedance matching network and design method thereof
  • Impedance matching network and design method thereof

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Embodiment Construction

[0042] Below, with figure 1 The impedance matching of the piezoelectric ceramic ultrasonic transducer shown is used as an example to describe the present invention in detail, and for the sake of simplicity of description, the piezoelectric ceramic ultrasonic transducer is referred to as transducer for short.

[0043] In order to consider the factors of transducer impedance change in the impedance matching design, it is first necessary to analyze the factors that affect the stability of impedance matching when the transducer impedance changes in the working state. In the embodiments described below, the reflection coefficient is used as the consideration index of the stability of impedance matching when the impedance of the transducer changes, and by analyzing the relationship between the quality factor and the reflection coefficient, it is determined that the harmonic suppression performance index can be satisfied at the same time The quality factor required by the requirement...

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Abstract

The invention provides an impedance matching network. By using a value of a passive device in the impedance matching network, the quality factor of the impedance matching network meets the requirement of harmonic suppression performance indexes and the requirement of impedance matching stability indexes during impedance change. Correspondingly, the invention provides a design method of the impedance matching network. In comprehensive consideration of the impedance change and harmonic suppression performance of a piezoelectric ceramic ultrasonic energy converter, an excellent impedance matching effect can be guaranteed under the operating state when the impedance of a load changes.

Description

technical field [0001] The invention relates to the technical field of impedance matching, in particular to an impedance matching network and a design method thereof when the impedance changes in a working state. Background technique [0002] Impedance matching refers to the specific matching relationship between the load impedance and the internal impedance of the signal source or the characteristic impedance of the transmission line. In the case of a given signal source, it is usually necessary to add an impedance matching network between the load and the signal source to achieve impedance matching. The impedance matching network generally uses passive devices (capacitors, inductors) to match the load impedance to the complex conjugate of the internal impedance of the signal source or the characteristic impedance of the transmission line, so as to reduce the power reflection at the load end and obtain the maximum power on the load. To suppress the role of harmonics. [0...

Claims

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Application Information

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IPC IPC(8): H03H7/06
Inventor 谭坚文王华
Owner RONGHAI SUPERSONIC MEDICINE EN
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