JP2606968Y2 - Phase-controlled microwave therapy device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a phase control type microwave treatment device for irradiating an affected part of a human body with a microwave to perform thermal treatment.

[0002]

2. Description of the Related Art As a prior art, Japanese Utility Model Publication No. Sho 63-48282.
The publication discloses a phase control circuit or triac, a trigger circuit, a magnetron, a transformer, a diode, a light emitting element, an output control means, a photocoupler, and a light receiving element. , A CR circuit and a trigger element, that is, a device including a diac or the like.

[0003]

[Problems to be Solved by the Invention] In the conventional apparatus,
Because the CR circuit and the diac are in the primary circuit of the commercial power supply,
There is a drawback that the CR circuit and the diac malfunction due to the influence of noise coming into the commercial power supply. Further, in the conventional device, since the trigger signal for activating the triac is generated by an analog signal from a photocoupler, there is a disadvantage that the trigger signal is easily affected by noise. That is, the time constant is changed by changing the resistance values of the circuit of the resistor and the capacitor in the conventional device in an analog manner, and the potential of the capacitor is taken out as a trigger signal and input to the triac to make the triac conductive. In this case, the line noise and the airborne noise affected the change in the resistance value, which disturbed the timing of the trigger signal, and this event made the microwave output unstable. The present invention solves the above-mentioned problems, and is capable of controlling the phase of a power supply without being affected by noise coming into a commercial power supply or noise in the air, thereby obtaining a stable microwave output. The purpose is to provide a vessel.

[0004]

That is, in the present invention, a microwave generator (3) for generating a microwave and a commercial power supply (1) are controlled in phase to supply power to the microwave generator (3). A driving unit (2), a secondary circuit power supply unit (6) made from a commercial power supply (1), and an output setting unit (5) for controlling the driving unit (2) to adjust a microwave output; The driving unit (2) includes a phase controller (7) for controlling a phase of an AC power supply input to the microwave generation unit (3), and a trigger unit (8) for providing a trigger signal to the phase controller (7). When,
A transformer (1) for boosting and rectifying the output of the phase controller (7)
1) a diode (12), a power supply synchronization detection circuit (9) for taking in a synchronization signal from a commercial power supply (1), and a phase adjustment circuit (10) for providing a trigger signal to a trigger device (8). A phase control type microwave therapy apparatus characterized in that a power supply of a secondary circuit power supply section (6) is applied to the synchronization detection circuit (9) and the phase adjustment circuit (10). The phase controller (7) is a triac (14), the trigger unit (8) is a phototriac (15), and the phototriac (15) digitally operates the triac (14).

[0005]

According to the present invention, the affected part of a patient is irradiated with microwaves to heat the affected part and perform a thermal treatment. The drive unit 2 of the present invention controls the phase of the commercial power supply 1 and supplies the controlled power to the microwave generation unit 3, the microwave generation unit 3 generates microwaves, and the antenna unit 4 transmits the generated microwaves to the affected part. The output setting unit 5 controls the driving unit 2 to adjust the amount of microwave output. The secondary circuit power supply section 6 is a DC power supply generated from the commercial power supply 1 and supplies the power supply to the power supply synchronization detection circuit 9, the phase adjustment circuit 10, and the output setting section 5 to make these electronic circuits operative. . In particular, the phase adjustment circuit 10 applies power to the secondary circuit power supply unit 6 and is placed in a state where it is cut off from noise coming from the commercial power supply 1.

The phase controller 7 of the driving unit 2 controls the phase of the AC power supplied to the microwave generator 3, the trigger unit 8 supplies a trigger signal to the phase controller 7, and the power supply synchronization detecting circuit 9 The phase adjustment circuit 10 provides a trigger signal to the trigger 8, the transformer 11 boosts the output of the phase controller 7, and the diode 12 rectifies the output of the transformer 11. I do. The output setting unit 5 adjusts a shift in the generation timing of the trigger signal generated by the phase adjustment circuit 10. The phototriac 15 operates the triac 14 digitally.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In this embodiment, a commercial power source 1 is obtained and a driving unit 2 for controlling the phase of the commercial power source 1 is obtained. A microwave generation unit 3 for generating a microwave, an antenna unit 4 for irradiating the microwave generated by the microwave generation unit 3,
It comprises an output setting unit 5 for controlling the driving unit 2 to adjust the amount of generation of microwaves, and a secondary circuit power supply unit 6 for producing a DC 12V power supply from the commercial power supply 1.

The driving section 2 includes a phase controller 7 for controlling the phase of the AC power supplied to the microwave generator 3, a trigger 8 for providing a trigger signal to the phase controller 7, and a synchronizing signal from the commercial power 1. Power supply synchronization detection circuit 9 for detecting and capturing signals
And a phase adjusting circuit 10 for providing a trigger signal to the trigger device 8
And a transformer 11 for boosting the output of the phase controller 7, a diode 12 for rectifying the output of the transformer 11, and a high-voltage capacitor 13 for voltage doubler rectification. The phase controller 7 includes a triac 14 and is an element for intermittently supplying power to the transformer 11.

The trigger device 8 is a phototriac 15
The phototriac 15 is composed of a light emitting diode 16 which emits light when a predetermined signal is obtained, and a small triac 17 which conducts by reacting digitally when the diode 16 emits light. The phase adjusting circuit 10 generates a trigger signal when the potential of the capacitor 19 in the circuit including the resistor 18 and the capacitor 19 reaches a predetermined constant potential, that is, a threshold value.

According to the signal from the power supply synchronization detecting circuit 9, the electric charge charged by the capacitor 19 is instantaneously reduced to zero at a cycle synchronized with the power supply frequency, and the capacitor 19 repeatedly charges in synchronization with the cycle of the power supply frequency. The capacitor 1
The trigger signal is output from the phase adjustment circuit 10 utilizing the charging operation of No. 9 in synchronization with the above-described cycle. The output setting unit 5 includes a resistor 18 and a capacitor 1 of the phase adjustment circuit 10.
9 to adjust and adjust the timing of the trigger signal generated by the circuit 10, that is, the time when the phase is shifted. The output setting unit 5 includes an output setting unit 20 for manually changing and adjusting by an operator and setting a desired microwave output.
And a negative feedback input circuit 21 for performing negative feedback control so as to automatically and stably maintain the microwave generation amount once set by the setting device 20.

The negative feedback input circuit 21 detects an anode current of a magnetron 23 that oscillates microwaves by using a detection resistor 22 provided in the drive unit 2. The output of the negative feedback input circuit 21 is It is provided to the phase adjustment circuit 10. At this time, the feedback signal output from the negative feedback input circuit 21 is added to the output of the output setting unit 20 and is applied to the phase adjustment circuit 10. The output of the secondary circuit power supply unit 6 is supplied to a power synchronization detection circuit 9 and a phase adjustment circuit 1.
0 and the output setting unit 5 to activate these circuits. In FIG. 1, reference numeral 24 denotes a heater transformer for supplying electric power to a heater 25 of the magnetron 23.

When performing the treatment, the above embodiment is set to the operating state, and the output setting unit 20 is adjusted to a desired value, and the driving unit 2, the microwave generating unit 3, the antenna unit 4
Actuate the desired operation to obtain microwave irradiation. At that time, first, when the output setting device 20 is set to a desired value, the phase adjustment circuit 10 operates to charge the capacitor 19 with the voltage set by the output setting device 20, and when the potential of the capacitor 19 exceeds a predetermined threshold value. Trigger signal is generated and triac 14
Is made conductive. The conduction of the triac 14 is repeated every one Hertz, and the Triac 14 is conducted for a predetermined period according to the setting over all Hertz during the use period.

According to the setting of the output setting unit 20, when the voltage applied to the circuit of the resistor 18 and the capacitor 19 is high, the capacitor 19 is charged quickly, the phase shift angle is small, and the conduction start time of the triac 14 is short in one cycle. Since the conduction period of the inside becomes long, most of the input electric power of the commercial power supply 1 reaches the transformer 11, the amount of generated microwaves becomes large, and a large amount of microwaves is irradiated from the antenna. Conversely, if the voltage applied to the circuit of the resistor 18 and the capacitor 19 is low, the charging speed of the capacitor 19 becomes slow, the phase shift angle is large, the conduction start timing of the triac 14 is delayed, and the conduction period in one cycle is short. Therefore, a small amount of the input electric power of the commercial power supply 1 reaches the transformer 11, and the amount of generated microwaves becomes small, so that a small amount of microwaves is emitted from the antenna.

When the commercial power supply 1 fluctuates and the voltage rises when the embodiment is used, the voltage applied to the magnetron 23 rises and the anode current increases, and the amount of microwave generation increases substantially in proportion to the anode current. , Which could endanger the patient,
In this embodiment, the negative feedback input circuit 21 detects an increase in the anode current, and the resistance 18 and the capacitor 1 of the phase adjustment circuit 10 are detected.
9 to reduce the voltage applied to the trigger signal 9, increase the phase angle shift of the trigger signal, delay the generation time, shorten the conduction period of the triac 14, reduce the power applied to the transformer 11, and reduce the generation of microwaves. It acts to reduce and, as a result, keeps the amount of generated microwave stable at the value set by the operator. That is, the negative feedback input circuit 21, the phase adjustment circuit 10, and the like perform feedback control so that the generation amount of the microwave is maintained at the set constant value. Conversely, when the voltage of the commercial power supply 1 decreases, the conduction period of the triac 14 is prolonged, which acts to increase the amount of generated microwaves and keeps the amount of generated microwaves stable so as not to decrease.

In the embodiment described above, the negative feedback input circuit 21
Although the target signal to be detected is the anode current of the magnetron 23, the detection target signal may be the microwave power generated by the magnetron 23, although not shown in other embodiments.

[0016]

According to the first aspect of the present invention, the phase adjustment circuit 10 is operated by the power supply of the secondary circuit power supply unit 6 for generating a DC power supply from the commercial power supply 1, and is triggered by the voltage applied by the output setting unit 5. Since the amount of microwave generation is adjusted by setting the signal timing, the timing of the trigger signal is not disturbed by noise input from the commercial power supply 1, and the amount of microwave generation is stabilized. Can be
Therefore, the treatment of microwave irradiation can be performed safely. That is, since the voltage for operating the phase adjustment circuit 10 is a voltage generated in the secondary circuit of the commercial power supply 1, noise entering the commercial power supply 1
And the capacity of the resistor 18 and the capacitor 19 of the phase adjustment circuit 10 is fixed, so that the time constant is not disturbed by noise, and further, an output setting device for applying a voltage to the capacitor 19 The trigger signal is not disturbed by the noise of the commercial power supply 1 because the voltage for operating the power supply 20 is also a voltage created in the secondary circuit that is not affected by the noise of the commercial power supply 1.

The light emission of the photo triac 15 in the present invention according to the present invention uses a digitally operated triac 14, which eliminates members susceptible to line noise and airborne noise and is affected by noise. Because it was difficult, stable trigger timing could be secured, microwave generation could be obtained stably, and the safety of treatment by microwave irradiation was improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating a phase adjustment circuit according to an embodiment of the present invention.

[Description of Signs] 2 Drive unit 3 Microwave generation unit 5 Output setting unit 6 Secondary circuit power supply unit 7 Phase controller 8 Trigger device 9 Power supply synchronization detection circuit 10 Phase adjustment circuit 11 Transformer 12 Diode 14 Triac 15 Phototriac

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61N 5/02 H05B 6/68 H05B 41/39 H05B 41/24

Claims (2)

(57) [Scope of request for utility model registration] A microwave generator (3) for generating microwaves, a driving unit (2) for controlling the phase of a commercial power supply (1) to supply power to the microwave generator (3), and a commercial power supply (3). A secondary circuit power supply section (6) made from 1), and an output setting section (5) for controlling the drive section (2) to adjust the microwave output. A phase controller (7) for controlling the phase of the AC power supplied to the generator (3), a trigger (8) for providing a trigger signal to the phase controller (7), and an output of the phase controller (7) (11) and a diode (12) for boosting and rectifying
A power supply synchronization detection circuit (9) for taking in a synchronization signal from a commercial power supply (1); and a phase adjustment circuit (10) for providing a trigger signal to a trigger device (8), wherein the power supply synchronization detection circuit (9) and the phase adjustment A phase-controlled microwave therapy device, wherein the circuit (10) is supplied with power from a secondary circuit power supply (6). 2. The phase controller (7) is connected to a triac (1).
4), and set the trigger device (8) to the phototriac (1).
5. The phase-controlled microwave therapy device according to claim 1, wherein the phototriac (15) digitally activates the triac (14).