JPH08173555A - Low frequency therapeutic apparatus - Google Patents

Abstract

PURPOSE: To decrease loss of electric energy and to obtain a specific boosted voltage. CONSTITUTION: An oscillation circuit 11 is tuned on/off by a low frequency pulse from a control part 13 to generate intermittent AC voltage, which is applied to a primary electrode 15a of a piezoelectric transformer 14 and boosted to voltage capable of stimulating a human body 17 to be outputted from a secondary electrode 15b. This is rectified by a rectifying part 16 to be applied to the human body 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low frequency treatment device which operates at a low voltage and has a booster circuit for boosting a power supply voltage.

[0002]

2. Description of the Related Art Conventionally, a well-known low-frequency therapy device includes a DC power supply such as a battery, a booster circuit for pulse-converting a DC power supply voltage and boosting and outputting the same, and a control circuit. There is something. A concrete example is shown in FIG.
This low frequency treatment device responds to a battery 1, a voltage booster circuit 2 that chops the voltage of the battery 1 and boosts and outputs the voltage, a voltage detection circuit 3 that detects the output voltage of the voltage booster circuit 2, and a detected voltage. The duty ratio of the boosting pulse of the boosting circuit 2 is controlled so that the output voltage becomes constant, and a control unit (CPU / gate array) 4 that opens and closes the output of the boosting circuit 2 is provided.

FIG. 4 is a circuit showing another specific example of the related art, which is provided with a clamp circuit 5 in place of the voltage detection circuit 3 of FIG. Even if the output of the booster circuit 2 increases, this low-frequency treatment device clamps the output by the clamp circuit 5 and makes it a constant output. In any of the low frequency treatment devices, the pulse signal output from the booster circuit 2 is applied to the human body 6 to perform the treatment action.

[0004]

All of the above low-frequency treatment devices require a capacitor (accumulation means) for accumulating energy from the boosting means, and in order to keep the output voltage constant, the capacitor shown in FIG. The one requires a voltage detection circuit and the one in FIG. 4 requires a clamp circuit, and each consumes excess electric energy. Further, it takes a certain amount of time to accumulate a required amount of energy in the accumulating means, and it is necessary to output a control signal (drive pulse) from the control circuit to both the oscillation circuit and the output circuit. Is necessary.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a low-frequency therapeutic device which has a small energy loss and can obtain a constant boosted voltage.

[0006]

A low-frequency treatment device according to the present invention comprises a DC power supply, a booster circuit for boosting the DC power supply voltage, and an output circuit for applying the output voltage of the booster circuit to a treatment electrode. In the above, the booster circuit includes an oscillation circuit and a piezoelectric transformer. In this low-frequency treatment device, the piezoelectric transformer has a function of stepping up the AC voltage applied to the primary electrode with a constant step-up ratio and outputting it to the secondary electrode. Output is obtained, no storage means is required, and only one switching means can be opened and closed by the control pulse.

[0007]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a block diagram showing the configuration of a low frequency treatment device showing an embodiment of the present invention. This low frequency treatment device includes an oscillator circuit 11, a battery 12 for supplying a DC power supply voltage to the oscillator circuit 11 and other circuits, and an oscillator circuit 11.
The control unit 13 that outputs a low-frequency pulse (control pulse) that drives or stops the voltage, and the primary electrode 15a that receives the AC voltage from the oscillation circuit 12 and boosts the voltage to the secondary electrode 15b.
Piezoelectric transformer 14 that outputs more, and this piezoelectric transformer 1
Rectifying circuit 16 for rectifying the output of 4 and this rectifying circuit 16
Electrodes 18 and 19 for applying the output of the
It consists of and.

The control unit 13 is specifically composed of a CPU and a gate array. When a voltage having a natural frequency determined by the length direction is applied to the piezoelectric transformer 14 in the thickness direction (primary side), strong mechanical vibration occurs in the length direction due to the electrostrictive effect. This vibration is again converted into voltage by the electrostrictive effect,
A high voltage is output from the electrodes in the length direction. In this way, the input voltage can be boosted several hundred times by converting the input electric energy into mechanical energy and returning it to electric energy again. When the length is L and the thickness is T, the step-up ratio is V ₀ /
It is known that V _i = K · L / T.

In this low-frequency treatment device, the control unit 13 generates a low-frequency pulse a having a predetermined pattern and supplies it to the oscillation circuit 11. The oscillating circuit 11 is turned on / off by a low-frequency pulse, and is intermittently intermittent AC voltage (waveform b).
Is applied to the primary electrode 15a of the piezoelectric transformer 14. As a result, the piezoelectric transformer 14 transfers the input AC voltage to the human body 1.
The voltage is increased to a stimulatory voltage of 7 and the waveform c is input to the rectification unit 16. The rectification unit 16 rectifies this and outputs intermittent DC pulses (waveform d), which are applied to the human body 17 via the treatment electrodes 18 and 19.

FIG. 2 is a block diagram showing the configuration of a low frequency treatment device according to another embodiment of the present invention. This low frequency treatment device includes an oscillator circuit 11, a battery 12 for supplying a DC power supply voltage to the oscillator circuit 11 and other circuits, and an oscillator circuit 1.
AC voltage from 1 is received by the primary electrode 15a and boosted to 2
A piezoelectric transformer 14 that outputs from the next electrode 15b, a rectifier circuit 16 that rectifies the output of the piezoelectric transformer 14, a switch 20 that opens and closes the output of the rectifier circuit 16, and a low-frequency pulse that opens and closes the switch 20. It is composed of a control unit 13 for generating and outputting and treatment electrodes 18, 19 for opening and closing by a switch 20 and applying the obtained DC pulse voltage to the human body 17.

In the low frequency treatment device of this embodiment, the oscillation circuit 1
At 1, an AC voltage having the same frequency as the natural frequency of the piezoelectric transformer 14 is generated (waveform a), and this AC voltage is input to the primary electrode 15a of the piezoelectric transformer 14. The piezoelectric transformer 14 boosts this to a voltage that can stimulate the human body 17 and outputs it (waveform c). This AC voltage is rectified by the rectifying unit 16 and converted into DC (waveform e). The DC level of this waveform c is boosted to several times the voltage of the battery 12.
When the switch 20 is opened and closed by the low frequency pulse a from the control unit 13, the pulse voltage d corresponding to this low frequency pulse is applied to the treatment electrodes 18 and 1 of the DC voltage of the waveform e.
It is applied to the human body 17 via 9.

[0012]

According to the present invention, since the piezoelectric transformer is used as the boosting means, the storing means for boosting is unnecessary, and the switch opened / closed by the low frequency pulse is also 1
The number of individual units is sufficient, the circuit configuration is simple, and the size can be easily reduced. Moreover, since the accumulation time is unnecessary, the effect that the start switch can be turned on and the operation can be performed immediately can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a low frequency treatment device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a low frequency treatment device according to another embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a configuration of a conventional low frequency treatment device.

FIG. 4 is a block diagram showing another example of a conventional low frequency treatment device.

[Explanation of symbols]

 11 Oscillation circuit 13 Control part 14 Piezoelectric transformer 15a Primary electrode 15b Secondary electrode 16 Rectification part 18, 19 Treatment electrode

Claims (3)

[Claims] 1. A low-frequency treatment device comprising a DC power supply, a booster circuit for boosting the DC power supply voltage, and an output circuit for applying an output voltage of the booster circuit to a treatment electrode, wherein the booster circuit includes an oscillation circuit. A low-frequency treatment device including a piezoelectric transformer. 2. The boosting circuit receives an output of the oscillating circuit driven by a DC power supply voltage at its primary electrode,
It comprises a piezoelectric transformer that outputs an AC voltage boosted from the secondary electrode, and a rectifying circuit that rectifies the output of the piezoelectric transformer, and the rectifying circuit is opened and closed in a predetermined pattern by a pulse signal from the control unit. Claim 1 which is a thing
The low frequency treatment device described. 3. The oscillating circuit, which is driven by a DC power supply voltage and is driven / stopped in a predetermined pattern by a pulse signal from a control section, and an output of the oscillating circuit which is received by a primary electrode of the oscillating circuit. The low frequency treatment device according to claim 1, comprising a piezoelectric transformer that outputs an alternating voltage boosted from the next electrode, and a rectifying circuit that rectifies the output of the piezoelectric transformer.