JPS58112556A - Ultrasonic treating machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrashort wave therapy device that can cure neuralgia and muscle pain and promote health by irradiating the human body with ultrashort waves and activating the body by increasing the temperature of the affected area. It is. Specifically, the purpose is to prevent transistor breakdown even if the capacitance of the conductor applied to the affected part of the human body changes 6 or if there is an abnormality such as a break in the cable and excessive stress occurs on the transistor. .

Traditionally, there wasn't a very good way to do it. In general, ■ using a high-voltage Zener diode in the output transistor to cant the voltage above the specified voltage, and ■ considering the combined voltage reflected from the conductor as about 10 times the voltage, and adjusting the withstand voltage of the output transistor to match that. do. (4) A method of finding abnormal voltage by some means and cutting off the power using a relay. The above three ways are possible.

Disadvantages of each are as follows: Zener diodes have a large power loss, making them unsuitable in terms of price and reliability. - Few high-voltage transistors physically operate in the high frequency range, making them difficult to use in electronic circuits and resulting in excessive quality. ■
Lack of reliability due to delays due to relay response speed, breakdown due to relay life, etc. Conventional methods have such drawbacks.

The present invention has been made in view of the above points, and is designed to prevent changes in the capacitance of the conductor that is applied to the human body or the image area, especially abnormalities such as an open state where the conductor is not in close contact with the human body, disconnection of the cable, short circuit, etc. , the power supplied from the output transistor to the conductor returns, that is, the reflected power generates an abnormally high voltage, but this is detected and the power is cut off, causing the output transistor to be destroyed. Provide protection. This specifically eliminates the drawbacks seen in the prior art.

Embodiments of the present invention will be described below with reference to the drawings.

An oscillation circuit 1 generates an ultrahigh frequency output, a drive circuit 2 performs power amplification, and the amplified power is applied to the gate of an output transistor 4. This output transistor 4 performs sufficient power amplification, and the capacitances of the coil 5, output coil 12, and trimmer capacitor 13 perform tuning of the ultrahigh frequency frequency. The output coil 12 supplies ultrashort wave output proportional to the tap ratio n:1 to the conductor 15 for obtaining a medical effect,
Ultrashort waves are irradiated to the affected area of the human body.

Then, an abnormally high voltage is generated in the output transistor 4 due to a change in the capacitance of the conductor 16 or an abnormality such as a cable breakage. This abnormally high voltage is applied to the base of the transistor 11 via the voltage divided by the resistors 9 and 10, and the constants of the resistors 9 and 10 are selected so that the base current starts flowing when the maximum absolute voltage of the output transistor 4 is reached. Transistor 11 is made conductive.

Normally, the gate current of the thyristor 6 flows through the resistor 7, and the AClooV power supply indicated by 8 flows from the anode to the cathode of the thyristor 6, which performs a rectification operation and is smoothed by the capacitor 3, resulting in a DC voltage power supply. It becomes.

However, when the transistor 11 is in a conductive state, the thyristor 6 is cut off, all current stops, and the current to the output transistor 4 is stopped, and the output transistor 4 is stopped.
can be prevented from being destroyed.

As described above, according to the present invention, it is possible to protect against abnormal high voltage due to changes in the capacitance of the conductor applied to the human body and reflection on the output transistor due to the condition of the cable. Also, there is no need for expensive Zener diodes or excessively high-quality high-voltage transistors, and the mechanical response speed of relays, etc.

It becomes possible to eliminate problems such as the number of lifetimes, and the reliability is dramatically improved.

[Brief explanation of the drawing]

Figure 6 is an electrical circuit diagram of an ultrashort wave treatment device according to an embodiment of the present invention. 4... Output transistor, 6... Thyristor, 11... Transistor, 15...
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Claims (1)

[Claims] A circuit that detects abnormally high voltage caused by reflections from conductors or cables at the drain of the transistor, turns the transistor on, turns off the thyristor, disables the power supply circuit, and prevents damage to the output transistor. Equipped with ultra short wave treatment machine.