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Power amplifier of physiotherapeutic instrument

A technology of a power amplifier and a physiotherapy apparatus, which is applied in the field of power amplifiers of short-wave treatment machines, can solve the problems of burnout of the final stage power amplifier, short service life, low frequency accuracy, etc., and achieves low working voltage, long service life and adaptability. strong effect

Active Publication Date: 2011-02-09
郑州华航科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tube amplifier has the following disadvantages: short service life, poor stability, low frequency accuracy, low work efficiency, and its working voltage is nearly 2000V, which poses a certain threat to medical staff and patients
However, in these experiments, due to improper matching or poor protection of the transistor, the final power amplifier in the final amplifier circuit was burnt out, so there is no transistor power amplifier in practice.

Method used

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  • Power amplifier of physiotherapeutic instrument
  • Power amplifier of physiotherapeutic instrument
  • Power amplifier of physiotherapeutic instrument

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the present invention includes a 40.68MHz temperature-compensated crystal oscillator and a front-stage pre-amplification circuit connected to the temperature-compensated crystal oscillator. stage amplifying circuit, and the output end of the final stage amplifying circuit is connected to the output matching circuit. Both the above-mentioned pre-stage driving amplifier circuit and the final stage amplifier circuit are provided with respective operating point setting circuits. Usually, the operating point setting circuit includes a PTT control circuit and a power supply circuit, wherein the power supply circuit generally adopts a voltage of 28V.

[0017] In order to realize the transistorization of the power amplifier of the physical therapy instrument, a pre-stage push amplifier is set in the pre-stage push amplifier circuit, and a final power amplifier is set in the final stage amplifier circuit. Both the pre-stage push amplifier and the fina...

Embodiment 2

[0025] The difference between this embodiment and Embodiment 1 is that in this embodiment, in order to ensure the normal operation of the pre-stage push amplifier V6 and the final power amplifier V9, the output end of the above-mentioned final power amplifier circuit is connected to a directional coupler, and the directional coupling The output end of the coupler is connected to the output matching circuit; among them, the directional coupler is connected with a standing wave protection circuit and a power detector, such as figure 1 shown.

[0026] Specifically, the transformer T8 sends the amplified signal to the directional coupler D1, and then the final output impedance matching is performed by the output transformers T9 and T10, and finally the signal is output from the output terminal of the output transformer T10, and sent to the back-end tuning indicating circuit. Among them, diodes VD26, VD27, VD28 and peripheral resistors, capacitors and inductors constitute the powe...

Embodiment 3

[0030] The difference between this embodiment and Embodiment 1 is that in this embodiment, in addition to the PTT control circuit, an anti-EMI electromagnetic compatibility circuit is also included in the operating point setting circuit of the pre-stage drive amplifier circuit and the final stage amplifier circuit. . Specifically, in this implementation, the 28V voltage supplied by the power supply is sent to the power amplifier through the feed-through filter, so it also includes an anti-EMI electromagnetic compatibility circuit. Due to the addition of new anti-EMI materials, this can be effectively improved. Electromagnetic Compatibility of Power Amplifiers.

[0031] In addition, in this embodiment, the turn ratio of the input and output coils of the output transformer T10 in the output matching circuit is 1:8, and its output impedance is 400Ω.

[0032] Other technical characteristics are identical with embodiment 1.

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Abstract

The invention discloses a power amplifier of a physiotherapeutic instrument. The power amplifier comprises a temperature compensated crystal oscillator and a fore pre-amplifying circuit connected with the temperature compensated crystal oscillator, wherein the output end of the fore pre-amplifying circuit is connected with a fore push amplifying circuit; the output end of the fore push amplifying circuit is connected with a final amplifying circuit; the output end of the final amplifying circuit is connected with an output matching circuit; both the fore push amplifying circuit and the final amplifying circuit are provided with a working point setting circuit respectively; a fore push amplifier is arranged in the fore push amplifying circuit; a final power amplifier is arranged in the final amplifying circuit; and both the fore push amplifier and the final power amplifier are high-power MOS (metal oxide semiconductor) field-effect tubes. Transistors are uses as a push stage and an output stage of the power amplifier so as to fill the blank of the power amplifier of the physiotherapeutic instrument in the absence of the high-power transistors. In order to ensure normal work of the transistors, a transistor high-power amplifier matching technique, a standing wave protection technique and an automatic detection technique for a directional coupler are adopted.

Description

technical field [0001] The invention belongs to a power amplifier, in particular to a power amplifier of an ultrashort wave therapy machine for clinical use. Background technique [0002] At present, the power amplifiers of ultrashort wave therapy machines (physiotherapy instruments) used clinically in hospitals are all electron tube amplifiers. The tube amplifier has the following disadvantages: short service life, poor stability, low frequency accuracy, low work efficiency, and its working voltage is nearly 2000V, which poses a certain threat to medical staff and patients. Need to warm up for a period of time before the treatment work starts, not only wasting energy but also wasting time. In addition, the working life of the electronic tube is only 500 to 600 hours, and it must be replaced with a new electronic tube at that time, which is labor-intensive and expensive. [0003] In order to realize the transistorization of the power amplifier of the physical therapy instr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/00
Inventor 刘二朋郭建增蔡朝辉
Owner 郑州华航科技股份有限公司
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