KR102435976B1 - Low frequency stimulator - Google Patents

Abstract

The present invention relates to a low-frequency stimulator. According to the present invention, a power supply for supplying operating current to each circuit element, a low-frequency generator 110 for generating low frequencies by receiving power from the power supply, and a body part to be stimulated A plurality of electrodes (T1, T2, T3, T4) which touches on and outputs the low frequency generated by the low frequency generator 110, and the low frequency generated by the low frequency generator 110 is generated by the plurality of electrodes T1, In the low-frequency stimulator comprising an MCU (120) for controlling the output of the low-frequency generator (110) so as to be output to T2, T3, T4), the low-frequency generator (110) and the electrodes (T1, T2, T3, T4) connected between, and characterized in that the impulse removal unit 130 for removing the impulse peak voltage from the low frequency generated by the low frequency generation unit 110 is further included and configured, according to this, in a short moment in the low frequency stimulation process It has the advantage of eliminating the stinging pain you feel on the skin.

Description

Low-frequency stimulator {LOW FREQUENCY STIMULATOR}

The present invention relates to a low-frequency stimulator, and more particularly, to a low-frequency stimulator suitable for removing the stinging pain felt in the skin in a short moment during the low-frequency stimulation process of the low-frequency stimulator.

In general, a low-frequency stimulator is a stimulator that stimulates a local part of the human body using a low frequency to improve pain or obesity, such as muscle pain or neuralgia. Various devices have been developed and are widely distributed and used by the general public.

Electrical stimulation is a method to improve all kinds of pain caused by various causes by stimulating the peripheral nerves of the skin using electric current. The low frequency stimulator using the facts stimulates the local part of the human body to which the electrode is attached through the pad [electrode] of the low frequency generated from the low frequency generator using a low voltage.

And, recently, such a low-frequency stimulator has been widely used for the purpose of improving urinary incontinence.

In general, urinary incontinence refers to a symptom in which urine comes out through the urethra regardless of one's will, and is mainly caused by coughing, sneezing, laughing loudly, lifting heavy objects, or jumping rope, etc. Stress induced incontinence, a leaky phenomenon, is the most common symptom.

Recently, a low-frequency stimulator has been widely used to improve urinary incontinence.

However, in the process of using low-frequency stimulation to improve urinary incontinence as described above, when electrical stimulation is applied around the anus or perineum, which are sensitive areas, users feel a very unpleasant pain that stings instantaneously [Fig. 3(a)) Reference], there was a problem in that the use of the low-frequency stimulator was reluctant due to such a stinging momentary pain.

Document 1: Laid-open Patent Publication No. 10-2016-0073105 (published on June 24, 2016) Document 2: Registered Patent Publication No. 10-0850725 (Announcement date: August 06, 2008)

The present invention was created to solve the problems of the prior art as described above, and the purpose of the low-frequency stimulator according to the present invention is,

First, it makes it possible to remove the impulse peak voltage that causes the stinging pain of an extremely short time period (eg, ns vs. ns) that occurs in the process of outputting the low-frequency voltage, so that users can comfortably use the low-frequency voltage without any momentary stinging pain. to be stimulated,

Second, it consists of four electrodes touching the affected part, and by removing the impulse peak voltage included in the output voltage for each electrode, the impulse peak voltage, which is the cause of the unpleasant pain that seems to touch the nerve, can be reliably removed.

Third, by connecting a plurality of first, second, third and fourth impulse filter units in series, it is possible to more reliably remove the pain caused by the impulse peak voltage,

Fourth, to ensure that the residual voltage remaining after the output is stopped can be removed, and thus unexpected shock voltage that may be generated by the residual voltage can be prevented, so that the safety and reliability of the product can be guaranteed, and safe low-frequency stimulation to improve the environment,

Fifth, a stable voltage value at which a constant value corresponding to the value set by the user is maintained, that is, only a constant output value can always be output, and thus a constant stimulus can be always provided to the user using the low-frequency stimulator, thereby guaranteeing the reliability of the product. make it possible,

Sixth, when an overvoltage is applied, the output is stopped to provide a safe use environment,

Seventh, the output level can be set in multiple stages according to the user's condition, thereby providing an optimal stimulation environment,

Eighth, so that only constant and accurate voltage and current values can be output at all times according to the voltage value set by the user,

Ninth, if a short circuit occurs due to sweat or water in the course of use, or a large current is generated due to a short circuit due to a foreign substance on the PCB (Printed Circuit Board) of the low-frequency stimulator, it is detected in advance. to prevent breakdowns or failures and to keep users safe,

Tenth, to provide a low-frequency stimulator suitable for maximizing the effect of stimulation by sequentially stimulating the periphery of the affected area using four electrodes.

The low-frequency stimulator of the present invention for achieving the above object includes a power supply for supplying an operating current to each circuit element, a low-frequency generator for receiving power from the power supply to generate a low-frequency, and a low-frequency generation unit in contact with a body part A low frequency comprising a plurality of electrodes for outputting the low frequency generated by the unit, and an MCU (Mail Control Unit) for controlling the output of the low bar generating unit so that the low frequency generated by the low frequency generating unit is output to the plurality of electrodes In the stimulation apparatus, it is connected between the low-frequency generator and the electrode, characterized in that it further comprises an impulse removal unit for removing the impulse peak voltage in the low frequency generated by the low-frequency generator.

The low-frequency stimulator of the present invention having the above configuration has the following effects.

First, it has the effect of removing the impulse peak voltage that causes the stinging pain of an extremely short time period (eg, ns vs. ns) that occurs in the process of outputting the low-frequency voltage, and as a result, users do not have instant stinging pain. It has the effect of comfortably receiving low-frequency stimulation.

Second, by composing four electrodes touching the human body and removing the impulse peak voltage included in the output voltage for each electrode, the effect of reliably removing the impulse peak voltage, which is the cause of the unpleasant pain as if touching the nerve have.

Third, by configuring a plurality of first, second, third, and fourth impulse filter units in series, respectively, there is an effect that pain caused by the impulse peak voltage can be more reliably removed.

Fourth, ensure that the residual voltage remaining after output is stopped can be reliably removed, thereby preventing unexpected shock voltage that may be caused by residual voltage, and consequently ensuring the safety and reliability of the product. It has the effect of improving a safe low-frequency stimulation environment.

Fifth, it is possible to output only a stable voltage value at which a constant value corresponding to the value set by the user is maintained, that is, a constant output value. can have an effect.

Sixth, there is an effect of providing a safe use environment by stopping the output when an overvoltage is applied.

Seventh, the output level can be set in multiple stages according to the user's condition, thereby providing an optimal stimulation environment.

Eighth, there is an effect that only constant and accurate voltage and current values can be output according to the voltage value set by the user.

Ninth, when a short circuit occurs due to sweat or water during use, or a large current is generated due to a short circuit due to a foreign substance on the PCB of the low-frequency stimulator, it is detected in advance to prevent product failure or failure. It has the effect of preventing and protecting the safety of users.

Tenth, there is an effect that stimulation can be maximized by sequentially stimulating around the stimulation target using four electrodes.

1 is a block diagram of a low-frequency stimulator according to an embodiment of the present invention.
2 is a diagram illustrating the configuration of four electrodes in the low-frequency stimulator according to an embodiment of the present invention.
3 is an output waveform diagram. FIG. 3 (a) is an output voltage waveform diagram by a conventional low-frequency stimulator, and FIG. 3 (b) is an output voltage by a low-frequency stimulator according to an embodiment of the present invention. is a waveform diagram.

Hereinafter, a preferred embodiment of the low-frequency stimulator according to the present invention will be described in detail with reference to the accompanying drawings.

The low-frequency stimulator according to an embodiment of the present invention is a low-frequency stimulator that provides low-frequency electromagnetic stimulation by contacting electrodes (T1, T2, T3, T4) to a body part to be stimulated. A low-frequency generator that receives power from the power supply and generates a low frequency (for example, a low frequency of 100 to 900 Hz and a medium frequency of 1000 to 1100 Hz, which is a corresponding frequency band throughout the specification) (110) and a plurality of electrodes (T1, T2, T3, T4) which touches the body part to be stimulated (eg, the part around the anus and perineum) and outputs the low frequency generated by the low frequency generator 110, and the low frequency In a low-frequency stimulator comprising an MCU 120 that controls the output of the low-frequency generator 110 so that the low-frequency generated by the generator 110 is output to the plurality of electrodes T1, T2, T3, and T4, , is connected between the low-frequency generator 110 and the electrodes T1, T2, T3, and T4, and the impulse removal unit 130 for removing the impulse peak voltage P1 from the low frequency generated by the low-frequency generator 110. ) is characterized in that it is further included.

According to this, it is possible to remove the impulse peak voltage of an extremely short time period (eg, ns vs.) generated in the process of outputting the low-frequency voltage, and as a result, users can comfortably receive stimulation without unpleasant momentary pain. have.

Therefore, as shown in (a) of FIG. 3, the conventional impulse peak voltage P1 is generated. In the case of an embodiment of the present invention, as shown in FIG. 3 (b), the impulse peak voltage This is removed to form a smooth waveform as denoted by P2.

And, in the low-frequency stimulator according to an embodiment of the present invention, the electrodes T1, T2, T3, and T4 include a first electrode T1, a second electrode T2, a third electrode T3, and a fourth electrode. Consisting of an electrode T4, the impulse removing unit 130 includes a first impulse removing unit 131 connected in series between the low frequency generating unit 110 and the first electrode T1, and the low frequency generating unit. A second impulse removing unit 132 connected in series between the unit 110 and the second electrode T2, and a third impulse connected in series between the low frequency generating unit 110 and the third electrode T3 It is characterized in that it is composed of a removal unit 133 and a fourth impulse removal unit 134 connected in series between the low frequency generation unit 110 and the fourth electrode T4.

Accordingly, by removing the impulse peak voltage output for each electrode T1, T2, T3, and T4, there is an advantage in that the impulse peak voltage, which is the cause of the unpleasant pain as if touching the nerve, can be reliably removed.

In the low-frequency stimulator according to an embodiment of the present invention, the first impulse removing unit 131 includes a first resistance element R1 connected between the output terminal of the low-frequency generating unit 110 and the first electrode T1. A plurality of first impulse filter units R1 and C1 including a first capacitor C1 connected in parallel between the first resistance element R1 and the first electrode T1 are serially configured.

Similarly, the second impulse removing unit 132 includes a second resistance element R2 connected between the output terminal of the low frequency generator 110 and the second electrode T2, and the second resistance element R2 and A plurality of second impulse filter units R2 and C2 including a second capacitor C2 connected in parallel between the second electrodes T2 are configured in series, and the third impulse removing unit 133 includes: A third resistance element R3 connected between the output terminal of the low frequency generator 110 and the third electrode T3, and a third resistance element R3 connected in parallel between the third resistance element R3 and the third electrode T3 A plurality of third impulse filter units R3 and C3 including a capacitor C3 are configured in series, and the fourth impulse removing unit 134 includes an output terminal and a fourth electrode of the low frequency generator 110 . A fourth impulse filter comprising a fourth resistance element R4 connected between T4 and a fourth capacitor C4 connected in parallel between the fourth resistance element R4 and the fourth electrode T4. It is characterized in that a plurality of parts (R4, C4) are configured in series.

As described above, a plurality of first impulse filter units R1 and C1 are connected in series, respectively, a plurality of second impulse filter units R2 and C2 are connected in series, respectively, and a plurality of third impulse filter units R3 and C3 are connected in series. There is an advantage in that pain caused by the impulse peak voltage can be reliably removed by connecting a plurality of each in series and connecting a plurality of the fourth impulse filter units R4 and C4 in series, respectively.

In the low-frequency stimulator according to an embodiment of the present invention, the first capacitor is connected between the first impulse removing unit 131 and the first electrode T1, and after the low-frequency output through the first electrode T1, the first capacitor It is connected between a first discharge resistor Rc1 for discharging to remove the residual voltage remaining in (C1), and the second impulse removing unit 132 and the second electrode T2, and the second electrode ( A second discharge resistor Rc2 that discharges to remove the residual voltage remaining in the second capacitor C2 after the low-frequency output through T2, the third impulse removing unit 133, and the third electrode T3 ) and a third discharge resistor Rc3 that is discharged to remove the residual voltage remaining in the third capacitor C3 after the low-frequency output through the third electrode T3, and the fourth impulse A fourth connected between the removal unit 134 and the fourth electrode T4 and discharged to remove the residual voltage remaining in the fourth capacitor C4 after low-frequency output through the fourth electrode T4 It is characterized in that the discharge resistor (Rc4) is further included.

According to this, the residual voltage remaining after the output is stopped can be reliably removed, and as a result, unexpected shock voltage that may be generated by the residual voltage can be prevented, so that the safety and reliability of the product can be guaranteed and a safe low-frequency stimulation environment. has the advantage of enhancing

In the low-frequency stimulator according to an embodiment of the present invention, it is connected between the low-frequency generator 110 and the impulse canceller 130 , and outputs to the low-frequency generator 110 according to the control of the MCU 120 . and an output switching unit 140 for selectively outputting to the first, second, third, and fourth electrodes T1, T2, T3, and T4 is further included.

The low-frequency generator 110 includes a booster 111 that boosts the voltage output from the power supply to an output voltage Va, and an output voltage Va of the booster 111 to the electrodes T1, T2, and T3. , is composed of a pair of main switching unit 112 for switching to T4).

In this case, the main switching unit 112 includes a first main switching device F13 that switches on/off according to the control of the MCU 120 and a second main switch that switches on/off according to the control of the MCU 120 . It is configured to include a switching element (F24).

In the low-frequency stimulator according to an embodiment of the present invention, the output switching unit 140 is disposed between the first main switching element F13 of the low-frequency generator 110 and the first impulse removing unit 131 . A first output switching device 141 connected to the first output switching device 141 for switching an output to the first electrode T1 according to the control of the MCU 120, and a second of the low frequency generator 110 2 connected between the main switching element F24 and the second impulse removing unit 131, and switching the output of the low frequency generating unit 110 to the second electrode T2 according to the control of the MCU 120 It is connected between the second output switching element 142 and the low-frequency generator 110 and the third impulse removing part 131, and outputs an output to the low-frequency generator 110 according to the control of the MCU 120. It is connected between the third output switching device 143 for switching to the third electrode T3 and the low-frequency generator 110 and the fourth impulse removing section 134, and is controlled by the MCU 120 . Therefore, it is characterized in that it is configured to include a fourth output switching device 144 for switching the output to the fourth electrode (T4) in the low frequency generator (110).

Here, the MCU 120 switches on/off switching of the first, second, third, and fourth output switching elements 141, 142, 143, and 144 such that at least one or two pairs of the four electrodes T1, T2, T3, and T4 are selectively connected. characterized in that it controls.

The switching device may be configured of, for example, a Field Effect Transistor (FET).

In the low-frequency stimulator according to an embodiment of the present invention, the output voltage Va, which is connected to the front end of the low-frequency generator 110 and is a voltage output from the low-frequency generator 110, is fed back, and the feedback By outputting an output voltage control signal (PWM control signal) to the low frequency generation unit 110 until the received output voltage Va reaches a set voltage (a first set voltage), the low frequency generation unit 110 outputs An output stabilizing unit 150 for controlling the output voltage Va to be output as a set voltage (a first set voltage) is further included.

According to this, it is possible to output a stable voltage value at which a constant value is maintained, that is, a constant output value, and as a result, a constant stimulus can be always provided to the user using the low-frequency stimulator, thereby guaranteeing the reliability of the product.

In the low-frequency stimulator according to an embodiment of the present invention, the output voltage Va is connected to the output stabilization unit 150 to prevent the output voltage Va from rising above the limit voltage Vc, which is the maximum use range, and the output voltage Va) is fed back, and when the fed back output voltage Va is greater than the set limit voltage Vc, stopping the output of the output control signal of the output stabilizing unit 150 to limit the output of the low frequency generator 110 It is characterized in that the output limiter 160 is further included.

According to this, there is an advantage in that when an overvoltage is applied, the output is stopped to provide a safe use environment.

In the low-frequency stimulator according to an embodiment of the present invention, the output limiting unit 160 includes a voltage dividing unit 161 that receives an output voltage Va and divides the fed back voltage, and a reference voltage Vs. ), receives the reference voltage Vs of the reference voltage applying unit 162 and the output voltage of the voltage divider 161, and compares them to obtain an output voltage higher than the reference voltage In this case, the comparator 163 for outputting a control signal (logic signal High) is connected to the output stabilization unit 150 and the comparator 163 , and the control signal is input from the comparator 163 . In this case, it is characterized in that it comprises a blocking switching device 164 for blocking the output of the control signal of the output stabilization unit (150).

According to this, there is an advantage in that it is possible to stably limit the transient voltage with a simple configuration.

In the low-frequency stimulator according to an embodiment of the present invention, the output value setting unit 190, which is a user interface for setting the output voltage value, is connected to the output stabilization unit 150, and is input from the output value setting unit 190. According to the set voltage level set value, it is configured to further include an output level control unit 170 that generates a driving signal corresponding to the voltage level set value and outputs it to the output stabilization unit 150, wherein the output stabilization unit 150 is configured to A control signal is output to the low frequency generator 110 so that a voltage value according to the driving signal received from the output level controller 170 is output.

According to this, there is an advantage that the user can set the output level in multiple stages (for example, 15 stages in the range of 45 V to 120 V) according to his/her condition, and as a result, there is an advantage that an optimal stimulation environment can be provided.

In the low-frequency stimulator according to an embodiment of the present invention, when a voltage value set by the output value setting unit 190 (eg, a value obtained by dividing 45 to 110 V into 15 steps) is input, the MCU 120 is The set value is output to the output level control unit 170 , and the output level control unit 170 outputs a voltage value corresponding to the set output voltage value to the output stabilization unit 150 .

In this case, the MCU 120 receives the output voltage Va and controls the output value of the output stabilization unit 150 to be corrected so that the output value set by the output level control unit 170 is output. .

Accordingly, there is an effect that the output stabilizing unit 150 can always output only a constant voltage.

In the low-frequency stimulator according to an embodiment of the present invention, the output current sensing unit 180 for sensing the output current of the low-frequency generator 110 is further included, and the MCU 120 detects the output current. When the value of the output current received from the unit 180 is greater than a preset limit current value, the output of the low frequency generator 110 is stopped.

According to this, when a short circuit occurs due to sweat or water in the course of use, or a large current is generated due to a short circuit caused by a foreign substance on the PCB of the low-frequency stimulator, it is detected in advance to cause product failure or failure. It has the advantage of preventing and protecting users' safety.

In the low frequency stimulator according to an embodiment of the present invention, the output current sensing unit 180 includes a current detecting resistor 181 connected to the low frequency generating unit 110 and a current detecting resistor 181 connected to the current detecting resistor 181 . is configured to include an amplifying unit 182 for amplifying the , and the MCU 120 detects the amplified current of the amplifying unit 182 .

In the low-frequency stimulator according to an embodiment of the present invention, the four electrodes T1, T2, T3, and T4 are arranged in a quadrangular shape to form a stimulation region S1 in the center to surround the skin to be stimulated. and the MCU 120 is configured to sequentially output low frequencies to the four electrodes T1, T2, T3, and T4 in a circularly rotated form in one direction or the other so that the first, It is characterized in that the switching on/off of the 2,3,4 output switching elements (141, 142, 143, 144) is controlled.

According to this, since only the four electrodes T1, T2, T3, and T4 can form the stimulus in a circular shape, there is an advantage that the effect of the stimulus can be maximized.

As described above, preferred embodiments according to the present invention have been reviewed, and it is common knowledge in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features in addition to the above-described embodiments. It is self-evident to those who have Therefore, it should be understood that the above-described embodiments are illustrative and not restrictive.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

T1, T2, T3, T4 : electrode
110: low frequency generator
111: step-up unit 112: main switching unit
120 : MCU
130: impulse removal unit 131: first impulse removal unit
132: second impulse removal unit 133: third impulse removal unit
134: fourth impulse removal unit R1: first resistance element
R2: second resistance element R3: third resistance element
R4: fourth resistance element Rc1: first discharge resistor
Rc2: second discharge resistor Rc3: third discharge resistor
Rc4: fourth discharge resistor 140: output switching unit
141: first output switching element 142: second output switching element
143: third output switching element 144: fourth output switching element
150: output stabilization unit 160: output limiting unit
161: voltage distribution unit 162: reference voltage applying unit
163: comparison unit 180: output current sensing unit
181: current detection resistor 182: amplification unit
190: output value setting unit

Claims (4)

A power supply for supplying operating current to each circuit element, a low frequency generator 110 that receives power from the power supply and generates a low frequency, and a low frequency generated by the low frequency generator 110 touching the body part to be stimulated A plurality of electrodes (T1, T2, T3, T4) that output ) In the low-frequency stimulator comprising the MCU 120 for controlling the output,
It is connected between the low frequency generator 110 and the electrodes T1, T2, T3, and T4, and an impulse removal unit 130 for removing the impulse peak voltage from the low frequency generated by the low frequency generator 110 is further included. composed,
The electrodes T1, T2, T3, and T4 include a first electrode T1, a second electrode T2, a third electrode T3, and a fourth electrode T4,
The impulse removing unit 130,
a first impulse removing unit 131 connected in series between the low frequency generating unit 110 and the first electrode T1;
a second impulse removing unit 132 connected in series between the low frequency generating unit 110 and the second electrode T2;
a third impulse removing unit 133 connected in series between the low frequency generating unit 110 and the third electrode T3;
and a fourth impulse removing unit 134 connected in series between the low frequency generating unit 110 and the fourth electrode T4,
The first impulse removing unit 131,
A first resistance element R1 connected between the output terminal of the low frequency generator 110 and the first electrode T1, and a first resistance element R1 connected in parallel between the first resistance element R1 and the first electrode T1 A plurality of first impulse filter units (R1, C1) including a capacitor (C1) are configured in series,
The second impulse removing unit 132,
A second resistance element R2 connected between the output terminal of the low frequency generator 110 and the second electrode T2, and a second resistance element R2 connected in parallel between the second resistance element R2 and the second electrode T2 A plurality of second impulse filter units (R2, C2) including a capacitor (C2) are configured in series,
The third impulse removing unit 133,
A third resistance element R3 connected between the output terminal of the low frequency generator 110 and the third electrode T3, and a third resistance element R3 connected in parallel between the third resistance element R3 and the third electrode T3 A plurality of third impulse filter units (R3, C3) including the capacitor (C3) are configured in series,
The fourth impulse removing unit 134,
A fourth resistance element R4 connected between the output terminal of the low frequency generator 110 and the fourth electrode T4, and a fourth parallel connection between the fourth resistance element R4 and the fourth electrode T4 A plurality of fourth impulse filter units (R4, C4) including the capacitor (C4) are configured in series,
In order to remove the residual voltage remaining in the first capacitor C1 connected between the first impulse removing unit 131 and the first electrode T1 and after outputting the low frequency through the first electrode T1 a first discharge resistor (Rc1) for discharging;
In order to remove the residual voltage connected between the second impulse removing unit 132 and the second electrode T2 and remaining in the second capacitor C2 after the low frequency output through the second electrode T2 a second discharge resistor (Rc2) for discharging;
In order to remove the residual voltage remaining in the third capacitor C3 connected between the third impulse removing unit 133 and the third electrode T3 and after outputting the low frequency through the third electrode T3 a third discharge resistor (Rc3) for discharging;
In order to remove the residual voltage connected between the fourth impulse removing unit 134 and the fourth electrode T4 and remaining in the fourth capacitor C4 after the low-frequency output through the fourth electrode T4 A fourth discharge resistor (Rc4) for discharging is further included,
It is connected between the low-frequency generator 110 and the impulse canceller 130 and outputs an output to the low-frequency generator 110 according to the control of the MCU 120 to the first, second, third, and fourth electrodes T1 . , T2, T3, T4) is configured to selectively output the output switching unit 140 is further included,
The low-frequency generator 110 includes a booster 111 that boosts the voltage output from the power supply to an output voltage Va, and an output voltage Va of the booster 111 to the electrodes T1, T2, and T3. , composed of a pair of main switching units 112 for switching to T4),
The main switching unit 112 includes a first main switching device F13 that switches on/off according to the control of the MCU 120 , and a second main switching device that switches on/off according to the control of the MCU 120 . (F24) comprising,
The output switching unit 140,
It is connected between the first main switching element F13 of the low frequency generation unit 110 and the first impulse removing unit 131 , and outputs an output to the low frequency generation unit 110 according to the control of the MCU 120 . a first output switching element 141 for switching to the first electrode T1;
It is connected between the second main switching element F24 and the second impulse removing unit 131 of the low frequency generation unit 110, and outputs an output to the low frequency generation unit 110 according to the control of the MCU 120. a second output switching element 142 for switching to the second electrode T2;
It is connected between the low-frequency generator 110 and the third impulse removing part 131, and switches the output of the low-frequency generator 110 to the third electrode T3 according to the control of the MCU 120. a third output switching element 143;
It is connected between the low-frequency generator 110 and the fourth impulse removing part 134, and switches the output of the low-frequency generator 110 to the fourth electrode T4 according to the control of the MCU 120. It is configured to include a fourth output switching element (144),
It is connected to the front end of the low-frequency generator 110, receives an output voltage Va that is a voltage output from the low-frequency generator 110, and receives an output voltage until the fed back output voltage Va reaches a set voltage. By outputting a control signal to the low-frequency generator 110, an output stabilizing unit 150 for controlling the output voltage Va output from the low-frequency generator 110 to be output as a set voltage is further included and configured,
In order to prevent the output voltage Va from rising above the limit voltage Vc, which is the maximum use range, it is connected to the output stabilization unit 150, receives the output voltage Va as feedback, and the fed back output voltage Va is set. When it is greater than the limiting voltage Vc, the output limiting part 160 for limiting the output of the low frequency generator 110 by stopping the output of the output control signal of the output stabilizing part 150 is further included and is configured,
The output limiting unit 160,
A voltage divider 161 that receives the feedback of the output voltage Va and divides the fed back voltage, a reference voltage application unit 162 that applies a reference voltage Vs, and the reference voltage application unit 162 a comparator 163 that receives the reference voltage Vs and the output voltage of the voltage divider 161, compares them, and outputs a control signal when the output voltage is greater than the reference voltage; and the output stabilization unit 150 ) and the comparison unit 163, and when a control signal is input from the comparison unit 163, it comprises a blocking switching device 164 for blocking the output of the control signal of the output stabilization unit 150, and ,
an output value setting unit 190 which is a user interface for setting an output voltage value;
An output connected to the output stabilizing unit 150 and outputting to the output stabilizing unit 150 by generating a driving signal corresponding to the voltage level setting value according to the voltage level setting value input from the output value setting unit 190 . It is configured to further include a level control unit 170,
The output stabilization unit 150 outputs a control signal to the low frequency generator 110 so that a voltage value according to the driving signal received from the output level control unit 170 is output,
When the voltage value set by the output value setting unit 190 is input, the MCU 120 outputs the set value to the output level control unit 170, and the output level control unit 170 corresponds to the set output voltage value. output the voltage value to the output stabilization unit 150,
The MCU 120 receives the output voltage Va as feedback, and controls the output value of the output stabilization unit 150 to be corrected so that the output value set by the output level control unit 170 is output,
An output current sensing unit 180 for sensing the output current of the low frequency generating unit 110 is further included and configured,
The MCU 120 stops the output of the low frequency generator 110 when the value of the output current received from the output current sensing unit 180 is greater than the preset limit current value,
The four electrodes (T1, T2, T3, T4) are arranged in a quadrangular shape so that the stimulation area (S1) is formed in the center to surround the skin to be stimulated,
The MCU 120 is configured to sequentially output the low frequencies to the four electrodes T1, T2, T3, and T4 such that the low frequencies are sequentially output in a circularly rotated form in one direction or the other direction. 3 and 4, a low-frequency stimulator for controlling the switching on/off of the output switching elements (141, 142, 143, 144).
The method according to claim 1,
The output current sensing unit 180 includes a current detecting resistor 181 connected to the low frequency generator 110 and an amplifying unit 182 connected to the current detecting resistor 181 to amplify the current. is composed,
The MCU (120) is a low-frequency stimulator, characterized in that for detecting the amplified current of the amplifying unit (182).
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