Impedance matching network, self-adaptive impedance matching device and self-adaptive impedance matching method

An impedance matching network and impedance matching technology, applied in the direction of impedance network, multi-terminal pair network, electrical components, etc., can solve the problems of slow response speed, difficult to apply load, small adjustment range, etc., achieve low cost, reduce sampling speed and Requirements for time accuracy and the effect of simple implementation

Pending Publication Date: 2021-07-09
徐显坤
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the problems that the existing impedance matching devices have slow response speed, small adjustment range, and difficulty in applying loads with larger functions, the embodiment of the present invention provides an impedance matching network and an adaptive impedance matching device for energy source medical cosmetic devices And the method of calculating load impedance and realizing adaptive impedance matching, through the ingenious combination of multiple fixed-value inductors and capacitors, an adjustable capacitor and an adjustable inductor are formed, and an impedance matching network is realized by an adjustable capacitor and an adjustable inductor, and further An adaptive impedance matching device is composed of a sampling module, a controller, and an impedance matching network

Method used

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  • Impedance matching network, self-adaptive impedance matching device and self-adaptive impedance matching method

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Embodiment 1

[0068] like figure 2 A Γ-type impedance matching network is shown, which is composed of 6 capacitors and 6 inductors. Among them, the variable capacitor is composed of 5 capacitors C1~C5 connected in series, and the variable inductor is composed of 5 inductors L1~L5 connected in parallel. to make. Among them, C1-C5, L1-L5 are respectively connected with the corresponding relays, and the controller controls the relay group to realize the adjustable capacitance and inductance. In this embodiment, the capacitance value of the adjacent capacitor is reduced to 1 / 2 of the original capacitance value; the inductance value of the adjacent inductor is reduced to 1 / 2 of the original inductance value.

[0069] Therefore, the relative error of the varactor inductance is 1 / 2 6 =1.56%, in other embodiments, if the adjustment accuracy needs to be improved, the quantity of capacitors and inductors can be increased accordingly.

[0070] The access state of the relay group set corresponding ...

Embodiment 2

[0080] Based on the impedance matching network and the applied adaptive impedance matching device of Embodiment 1, this embodiment provides an impedance measurement method.

[0081] like image 3 One implementation of the sampling module is shown. It uses a dual directional coupler to measure the voltage amplitude of the incident and reflected waves, which is a widely used and inexpensive transmission line voltage measurement method; where, V + , V - The voltages at both ends correspond to the voltage amplitudes of the incident and reflected waves, respectively. Measurements can be made using a common ADC. Since there is a forward voltage drop when the diode is turned on, it is necessary to correct the voltage value collected by the ADC to obtain the actual voltage amplitude of the incident and reflected waves.

[0082] combine figure 2 Given the impedance matching network and image 3 Given the sampling module, this embodiment provides an optimized impedance measureme...

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Abstract

The invention discloses an impedance matching network and a self-adaptive impedance matching device and a method thereof, the impedance matching network is composed of a variable capacitor and a variable inductor, the variable capacitor is composed of at least two capacitors connected in parallel, the capacitance values are gradually reduced, and the maximum capacitance value is determined by the variable capacitance change range; the variable inductor is composed of at least two inductors connected in series, inductance values are gradually decreased, and the maximum inductance value is determined by the variable inductor change range. The self-adaptive impedance matching device comprises a sampling module, the impedance matching network and a controller, the controller executes calculation of load impedance after receiving a sampling signal, so that the characteristic parameters of the impedance matching network corresponding to the impedance matching state are determined, the impedance matching network is adjusted according to the characteristic parameters, and impedance matching is achieved. The impedance matching network and the adaptive impedance matching device have the advantages of wide matching range, high matching precision and flexibility, high reliability, low cost, fast response, simple implementation mode and the like.

Description

technical field [0001] The invention relates to the field of medical cosmetic devices, in particular to an impedance matching network, an adaptive impedance matching device and a method thereof. Background technique [0002] Many medical and aesthetic treatments involve the use of high-frequency and high-power energy to treat patients. In non-invasive cancer treatment, skin care, weight loss, muscle building and other treatments, energy is injected into the patient's body in the form of microwave, radio frequency, ultrasound, etc. achieve therapeutic effect. [0003] When energy is injected into the human body through the transmission line, it involves the matching of the transmission line and the load impedance of the human body. The voltage reflection coefficient Γ of the lossless transmission line is defined as: [0004] [0005] Among them, Z 0 is the characteristic impedance of the transmission line, usually 50 ohms; Z load is the load impedance, which is related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/38
CPCH03H7/38
Inventor 徐显坤
Owner 徐显坤
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