A Stepless Impedance Matching Network for Ultrasonic Power Supply

A matching network, ultrasonic technology, applied in impedance matching network, multi-terminal pair network, etc., can solve problems such as limitations, and achieve the effect of simple control and high precision

Active Publication Date: 2016-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of adjusting the size of the matching inductance is realized by inductance switching. This method makes the size accuracy of the matching inductance in the matching network limited by the minimum value of the switching inductance, and it is a step-by-step adjustment.
It is impossible to achieve the effects of inductance matching and frequency tracking with high precision

Method used

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  • A Stepless Impedance Matching Network for Ultrasonic Power Supply
  • A Stepless Impedance Matching Network for Ultrasonic Power Supply
  • A Stepless Impedance Matching Network for Ultrasonic Power Supply

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation, but the implementation and protection of the present invention are not limited thereto.

[0019] The matching network disclosed by the present invention is as figure 1 As shown, the matching inductance can be adjusted steplessly. By adjusting the size of the inductance, when the resonant frequency of the transducer drifts, the output voltage and current of the power supply can be in the same phase without changing the output frequency of the power supply. figure 2 is the circuit diagram of the signal processing module and the duty ratio control module in the matching network, such as figure 2 As shown, the output voltage of the inverter bridge of the ultrasonic power supply passes through the step-down high-frequency transformer to obtain the output voltage sampling signal, respectively passes through the first comparator COMP5 and...

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Abstract

The invention relates to an impedance stepless matching network used for an ultrasonic power supply and a control method. The impedance stepless matching network comprises a first thyristor, a second thyristor, a first inductor and a second inductor, wherein the cathode of the first thyristor and the anode of the second thyristor are connected with one end of the first inductor; the anode of the first thyristor and the cathode of the second thyristor are connected with one end of the second inductor; the other end of the first inductor and the other end of the second inductor are connected to the main circuit inverter output end of the ultrasonic power supply and are connected with a transducer in parallel. An ultrasonic power supply inverter bridge outputs a voltage sampling signal subjected to signal processing to respectively generate driving signals synchronous with the negative direction and the forward direction of output voltage, the driving signals are respectively used for driving the gate pole of the first thyristor and the gate pole of the second thyristor, and the thyristor conduction angle can be controlled by a duty cycle control circuit so as to regulate the equivalent inductance and achieve the frequency tracking and fine tuning effects.

Description

technical field [0001] The invention relates to a stepless impedance matching network for an ultrasonic power supply and a control method. Background technique [0002] The ultrasonic power supply is usually called the ultrasonic generating source, and its function is to convert electrical energy into a high-frequency alternating current signal that matches the ultrasonic transducer. The load of the ultrasonic power supply is the ultrasonic transducer, and the ultrasonic transducer has static capacitance. Therefore, when the ultrasonic transducer is used, it must have a corresponding inductive matching network to cooperate with the work of the ultrasonic transducer. [0003] At present, the commonly used ultrasonic power supply matching network includes a single inductance matching network and a T-shaped matching network. By changing the size of the inductance in the matching network, the resonance frequency can be fine-tuned. The traditional method of adjusting the size of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/28
Inventor 杜贵平罗杰
Owner SOUTH CHINA UNIV OF TECH
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