JPH0539555U - Potential therapy device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a safety device that always operates with a specified load value even if the power supply voltage fluctuates. [Configuration] Reference value V proportional to the input voltage of the power supply
An overcurrent detection circuit 21 having a comparator COMP that inputs _R and a detection value V _D proportional to the current of the output circuit is provided, and the detection value V _D input to the comparator COMP becomes equal to or greater than the reference value V _R. Sometimes comparator C
Generates control output from OMP.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a potential therapy device for treating using high voltage, which detects an overload of the output circuit and notifies it, stops the output, and activates other safety-related means. It relates to a treatment device.

[0002]

[Prior Art]

 FIG. 4 is a perspective view showing a normal use mode of a conventional electric potential treatment device, wherein 1 is a main body of the electric potential treatment device, 2 is a high voltage output terminal of the main body 1 of the electric potential treatment device, and 3 is a high withstand voltage. The cords 4a are electrodes to which the high voltage from the electric potential treatment device main body 1 is applied, and 4b are insulators. Reference numeral 5 is a chair, 5a is an insulator for insulating the chair 5 from the floor, and 6 is a human body.

As shown in FIG. 4, the normal use is to sit on a chair 5 insulated from the floor (ground) by an insulator 5a on a conductive conductor 4 whose peripheral edge is covered with an insulator 4b. The treatment is performed by bringing a part of the human body 6, for example, a foot into contact with the human body 6 and applying a high potential to the human body 6.

FIG. 5 is a diagram showing a basic circuit of the general electric potential treatment device and the safety device shown in FIG. 4, and the same reference numerals as those in FIG. 4 denote the same parts, 7 is a commercial power supply, and 8 is an output. Stop relay contact, 9 is an overcurrent detection circuit, which opens the output stop relay contact 8 when an overcurrent is detected. The output stop relay contact 8 and the overcurrent detection circuit 9 constitute a safety circuit. Reference numeral 10 is a step-up transformer, and 11 is a current limiting resistor.

As described above, in the above-described conventional safety device for the electric potential therapy device, when the current of the preset fixed current value or more flows into the secondary circuit of the step-up transformer 10, it is detected by the overcurrent detection circuit 9. It was detected, and the output stop relay contact 8 was opened to stop the output.

[0006]

[Problems to be solved by the device]

 By the way, in the conventional safety device for the electric potential treatment device as described above, since the preset current value and the secondary current of the step-up transformer 10 are compared and detected, the power supply voltage is not changed. However, since the set value does not change, there is a problem in that the set value must be adjusted in advance.

An ideal safety circuit means that a high voltage is applied to the human body 6 for treatment, so that dangerous overcurrent does not flow to the human body 6, but the current value is less than that. If the value of the load is greater than or equal to the load that is predicted to be dangerous (hereinafter referred to as the set load), it operates in anticipation of the danger that a dangerous current may flow to the human body. This operating point depends only on the value of the set load, and the influence of power supply voltage fluctuations must be avoided as much as possible.

FIG. 6 is an equivalent circuit diagram showing the state of the load._i Is the input voltage of the commercial power supply 7, V is the secondary voltage of the step-up transformer 10, V is₀ Is the output voltage, I₀ Is the output current, R is the current limiting resistance value of the current limiting resistor 11, C is the load capacitance, and R is the load capacitance._L Is the load resistance value. Here, the commercial power supply 7 is V_i = 100V, 50Hz, output voltage at no load is V₀ = 10,000 V, the current limiting resistance R is fixed at 10 MΩ, and the input voltage V is set under the condition that the set value (operating current) of the overcurrent detection circuit 9 (FIG. 5) is 500 μA. _i Table 1 shows the calculation results of the equations (1) and (2) as to how the load value for operating the overcurrent detection circuit 9 changes when the value fluctuates by ± 10%. R in the table _L Is a resistance value when the loads are all resistors, and C is a capacitance value when the loads are all electrostatic capacitances.

[0009]

[Equation 1] When the load is only resistance

[0010]

[Equation 2] When the load is only capacitance However, ω = 2πf.

[0011]

[Table 1] As can be seen from the calculated values in Table 1, in the safety device of the conventional electric potential therapy device, the load value at the operating point fluctuates due to the fluctuation of the input voltage V _i , and the load resistance value R _L becomes 10 MΩ (I ₀ = 500 μA), even if it is set to operate at the power supply voltage of 90 V, the safety circuit does not operate and the load setting value is smaller than the desired value (load resistance value _RL Had to be set to a large value, that is, to have a small operating current (in Table 1, the input voltage V _i was 100 V, and the load resistance value R _L was 10 MΩ. In this case, when the input voltage V _i drops to 90 V, the safety device will not operate unless the load resistance value R _L drops to 8 MΩ.).

[0012] Further, if the sensitivity of the safety circuit is increased, the output may be stopped even when a single load increases when getting on and off the energizing conductor 4, etc. It was misunderstood that I had to lower the sensitivity to some extent.

The present invention has been made to solve the above problems, and provides a safety device for an electric potential therapy device that can always operate with a set load resistance value even when the power supply voltage changes. With the goal.

[0014]

[Means for Solving the Problems]

 The safety device of the electric potential therapy device according to the present invention is a detection device that generates a reference value proportional to the input voltage of the power supply input to the electric potential therapy device main body and a detection value proportional to the current of the output circuit of the electric potential therapy device main body. An overcurrent detection circuit equipped with a value generator and a comparator that inputs the reference value and the detected value is provided, and the control output is generated from the comparator when the detected value input to the comparator exceeds the reference value. This output signal also activates safety means such as alarm means and output stop means, and further activates the safety means only when the detected value continuously exceeds the reference value for a certain period of time or longer. By doing so, the purpose is achieved. .

[0015]

[Action]

 The safety device of the electric potential therapy device of the present invention operates at the set load even if the power supply voltage fluctuates because the reference value of the comparator also changes in proportion to the power supply voltage when the detected value fluctuates with the fluctuation of the power supply voltage. To do. Also, if it is operated only when an abnormal condition continues for a certain period of time or more, it will not operate due to a single increase in load that occurs when getting on or off the energizing conductor, so in such a case it is mistakenly recognized as a failure. Never be done.

[0016]

【Example】

 FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which the same reference numerals as those in FIG.₁ Is a relay contact for holding power, X₂ Is an output stop relay contact, Ry₁ Is a relay operating coil for holding power. A safety device 20 is composed of an overcurrent detection circuit 21, a timer circuit 22 and an operation circuit 23. The overcurrent detection circuit 21 has a reference value V proportional to the power supply voltage._R Diode D for generating₁ , Smoothing capacitor C₁ , Voltage divider R₁ , R₂ And a reference value generator 21a composed of a half-wave detection value V_D Diode D to convert to₂ , Conversion resistor R₃ It has a detection value generating section 21b made up of_D And reference value V_R And the detected value V_D Is the reference value V_R It is composed of a comparator COMP that generates a positive voltage at the output when the above is reached. The timer circuit 22 includes a NOR gate G₁ , G₂ And inverter INV₁ , INV₂ , INV₃ It consists of two monostable multivibrators consisting of The operation circuit 23 includes a NAND gate G₃ , Light emitting diode LED, output stop relay contact X₂ Output stop relay operating coil Ry ₂ It consists of Reference numeral 12 is a power switch. Also, C₂ , C₃ Is a capacitor, R_Four , R_Five , R₆ Is a resistor. The power supply circuit of the safety device 20 is not shown.

FIG. 2 is a main waveform diagram in the circuit diagram shown in FIG. 1, and reference symbols V _R , V _D , and a to _d correspond to a to _d in FIG. The operation of the embodiment shown in FIG. 1 will be described below with reference to FIG. First, when the power switch 12 is pushed, a current flows through the power holding relay operating coil Ry ₁ to close the power holding relay contact X ₁ , and this state is maintained even when the power switch 12 is released. As a result, a high voltage is generated at the output of the electric potential treatment device body 1, and the treatment of the human body 6 on the energizing conductor 4 is started.

At this time, when the load state becomes larger than the set value due to some reason (when the detected value V _D of the comparator COMP becomes larger than the reference value V _R , hereinafter referred to as an abnormal state) The output of the comparator COMP becomes a positive output voltage as shown by the waveform a, the light emitting diode LED of the operation circuit 23 is turned on, and it is input to the NOR gate G ₁ and the NAND gate G ₃ of the timer circuit 22. It At the positive edge of the waveform input to the NOR gate G ₁ , a pulse of T _{1 having} a time determined by the time constant of the resistor R ₄ and the capacitor C ₂ appears at the output of the inverter INV ₁ . A pulse of time T ₂ determined by the time constant of the resistor R ₅ and the capacitor C ₃ appears at the output of the inverter INV ₃ shown by the waveform C at the positive edge shown by the waveform b which is the inverted output of the inverter INV ₁ , and the NAND gate Input to G ₃ . Here, while the pulse of the time T ₂ appears, that is, when the abnormal state continues, the output of the NAND gate G ₃ becomes 0, so that the output stop relay operation is performed as shown by the waveform d. current flows through the coil Ry _2, open output stop relay contact X ₂ is a current source holding relay operation coil Ry ₁ is cut off, opens the power supply holding relay contacts X _1, the output of the electric potential therapeutic apparatus Be stopped.

As described above, Table 2 shows the calculation results in the case where the output current I ₀ changes in the same ratio as the power supply voltage in the equations (1) and (2).

[0020]

[Table 2] Although the voltage values are used as the reference value V _R and the detection value V _D in the above embodiment, other physical quantities may be used.

FIG. 3 shows an embodiment in which the timer function using the integrating circuit 21c is used in the input stage of the comparator COMP. R ₇ is an integrating resistor, C ₄ is an integrating capacitor, and the same symbols as in FIG. Indicates the same part.

Even if the current flowing through the output circuit increases for some reason and the detected value V _D exceeds the reference value V _R , the output side of the integration circuit 21c does not immediately reach that voltage and the product side When the time of the time constant determined by the resistor R ₇ and the integrating capacitor C ₄ elapses, the voltage becomes the same as the detected value V _D , the output is output from the comparator COMP, and the light emitting diode LED of the operation circuit 23 is output. Is turned on, a current flows through the output stop relay operating coil R _y2 , the output stop relay contact X ₂ opens, the power holding relay operating coil R _y1 is cut off, and the power holding relay contact X ₁ Is opened and the output of the electric potential treatment device is stopped. At this time, if the detected value V _D drops below the reference value V _R before the output from the comparator COMP, no output will be output, so the operation circuit 23 will not operate and the light emitting diode LED will No lighting or output stopped Yes.

In the embodiment of FIG. 1, the operation circuit 23 is operated via the timer circuit 22, but the operation circuit 23 is operated directly by the output of the overcurrent detection circuit 21 without the timer circuit 22. You may let me.

[0024]

[Effect of the device]

 As described above, the present invention provides a reference value generator that generates a reference value that is proportional to the input voltage of the power supply that is input to the electric potential therapy device main body, and a detection value that is proportional to the current of the output circuit of the electric potential therapy device main body. An overcurrent detection circuit equipped with a detection value generator that generates a reference value and a comparator that inputs the reference value and the detection value is provided.When the detection value input to the comparator exceeds the reference value, the output from the comparator is output. If the load is normal, the equipment will not operate even if the voltage of the power supply fluctuates. Also, if the detected value does not exceed the reference value continuously for a certain period of time, that is, if the abnormal state does not continue for a certain period of time, the device will not operate, so malfunctions will be reduced, and even if the abnormality detection sensitivity is increased, it is reliable. It has advantages such as not losing the sex.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a waveform diagram showing the operation of FIG.

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a normal use mode of a conventionally used electric potential treatment device.

5 is a diagram showing a basic circuit of the electric potential treatment device and the safety device of FIG. 1. FIG.

FIG. 6 is an equivalent circuit diagram showing the state of the load shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Potential therapy device main body 4 Energizing conductor 7 Commercial power supply 12 Power switch 20 Safety device 21 Overcurrent detection circuit 21a Reference value generation part 21b Detection value generation part 22 Timer circuit 23 Operation circuit COMP comparator Ry ₂ Output stop relay operation coil

Claims (3)

[Scope of utility model registration request] 1. A reference value generator that generates a reference value proportional to an input voltage of a power supply input to the main body of the electric potential therapy device, and a detection value that generates a detected value proportional to a current of an output circuit of the main body of the electric potential therapy device. An overcurrent detection circuit that includes a generation unit and a comparator that inputs the reference value and the detection value, and that generates a control output from the comparator when the detection value input to the comparator becomes equal to or greater than the reference value. An electric potential therapeutic device characterized by being provided. 2. At least one or more of various safety-related means such as an alarm generating means and a means for stopping output, which are operated by a control output generated from a comparator, are provided. The potential treatment device described. 3. The electric potential treatment device according to claim 2, further comprising a timer that outputs a control output only when the detected value continuously exceeds the reference value for a certain period of time or longer.