JP2889099B2 - Positive and negative potential difference generation circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive / negative potential difference generating circuit used for general AC electric circuits of electronic circuits and power circuits.

[0002]

2. Description of the Related Art For example, there is a potential therapy device as a device using a positive / negative potential difference generating circuit.

An electric potential treatment apparatus applies an AC voltage to the entire human body or applies an AC voltage to a local part of the human body to treat stiffness, constipation, and the like. It is considered that the therapeutic effect is enhanced by increasing the difference between the voltage and the voltage.

Conventionally, as a positive / negative potential difference generating circuit used in such a potential therapy apparatus, a circuit which adds an AC voltage and a DC voltage in order to generate a difference between a positive voltage value and a negative voltage value is used. Have been.

As shown in FIG. 5, a potential therapy apparatus using such a positive / negative potential difference generating circuit includes a main body 21 and an electric floor 29,
The main body 21 is composed of local conductors 30 and 31 and the operation unit 2
2. It comprises a display unit 23, a control unit 24, transformers 25 and 26, protective resistors 27 and 28, DC voltage sources 32 and 33, and the like.

The electric floor 29 is in a mat shape, and an AC voltage (about 3000 V to about 9000 V) from the transformer 25 is applied to the human body through the electric floor 29 when a person sits on or sleeps on the mat. Give to.

[0007] Further, by using the pen-shaped local conductor 30 and the roller-shaped local conductor 31 properly according to the shape of the part to be treated for the human body, the AC voltage from the transformer 26 is applied to the local part of the human body. (Approximately 200 V to approximately 800 V) is applied to the human body via the local conductors 30 and 31.

On the other hand, the DC voltage sources 32 and 33
DC voltages are applied to the voltage outputs of the transformers 5 and 26,
The baseline of the AC voltage output 6 is changed to the positive side or the negative side. If you want to change the applied voltage to the human body,
By setting the applied voltage from the operation unit 22, the control unit 2
In 4, the primary taps of the transformers 25 and 26 are switched.
The output on the secondary side can be made variable.

As described above, the addition of the DC voltage and the AC voltage to the voltage applied to the human body is used. For example, as shown in FIG. 6, the peak voltage of the transformer output is Va, and the voltage of the DC voltage source is Vd. Then, the maximum value on the positive side of the voltage when applied to the human body is Va + Vd, and the maximum value on the negative side is V
a-Vd, and the therapeutic effect is considered to be enhanced by increasing the difference between the positive voltage and the negative voltage (in this case, the difference is 2 Vd).

The protection resistors 27 and 28 are current limiting resistors for preventing overcurrent to the human body, and the display unit 23 displays the magnitude of the voltage applied to the human body, the remaining time of the output time of the applied voltage, and the like. Is displayed.

[0011]

In the above-mentioned conventional positive / negative potential difference generating circuit, a high voltage DC voltage source is separately required, and when it is desired to make the DC voltage level variable, a voltage source having another DC voltage level is required. Therefore, there is a problem that the difference between the positive voltage and the negative voltage cannot be easily changed.

The present invention has been made to solve the above problems, and provides a positive / negative potential difference generating circuit capable of easily setting a positive / negative voltage difference by easily changing a DC voltage level with a simple circuit configuration. It is intended to be.

[0013]

To achieve the above object, a positive / negative potential difference generating circuit according to the present invention is connected to a transformer and one end of a primary winding or a secondary winding of the transformer. A voltage drop element, and a diode connected between the other end of the voltage drop element and an intermediate point between a primary winding and a secondary winding of the transformer.

[0014]

When the voltage drop element and the diode are connected to the primary side of the transformer, the diode conducts according to the changing voltage value of the AC voltage input to the transformer, and the diode conducts. Then, the voltage drop element operates to cause a voltage drop. Therefore, when the voltage in the direction in which the diode conducts is applied to the transformer, the voltage value becomes low, and when the voltage in the direction in which the diode does not conduct is applied to the transformer, the voltage value is input as it is. Since a voltage proportional to this voltage change is output to the secondary side, a positive / negative voltage difference can be created.

Further, even when a voltage drop element and a diode are connected to the secondary side of the transformer, a positive / negative voltage difference of the transformer output can be created by the same operation as described above.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows the main components of the positive / negative potential difference generating circuit of the present invention. A resistor R1 as a voltage drop element is provided at a point A on the high voltage side of a secondary winding of a transformer T1, and a secondary winding of the transformer T1 is provided. The diode D1 is connected to a suitable intermediate point B, and the other end of the resistor R1 and the diode D1 is connected to the point C.

Here, the output voltage of the transformer T1, ie, C
How the point voltage changes will be described with reference to FIG. When a positive voltage is output to the point A, the potential at the point A becomes higher than the potential at the point B, the diode D1 becomes conductive, and the voltage difference between the voltage at the point A and the voltage at the point B (see FIG. 2). The voltage output at point C becomes the voltage output at point B (solid line in FIG. 2) because the voltage drops in the hatched area (the shaded area) due to the resistor R1.

On the other hand, when a negative voltage is output at point A, A
Since the potential at the point becomes lower than the potential at the point B, the diode D
1 is in a cutoff state, and the voltage at the point A (the solid line portion in FIG. 2) is output to the point C as it is because no voltage drop occurs due to the resistor R1.

Therefore, the maximum value of the positive voltage of the voltage output at the point C is V1 and the maximum value of the negative voltage is V2, so that a difference occurs between the positive and negative voltages.

The magnitude of the positive / negative voltage difference can be changed by changing the tap position B of the diode D1 connected to the secondary winding.

FIG. 3 shows a resistor R1 connected to the secondary winding.
This is an example in which a resistor R2 and a diode D2 are connected to the primary winding side of the transformer T2 in place of the diode D1 and a positive / negative voltage difference is applied to the output of the primary winding side of the transformer T2 by the same operating principle as described above. Since this voltage is stepped up or stepped down by the transformer T2 and output to the secondary winding side, a difference occurs between the positive and negative voltages. To change the magnitude of the positive / negative voltage difference, the diode D2 connected to the primary winding
Can be changed.

However, if a load is connected to the secondary side of the transformer,
When a load fluctuation occurs when the transformer of the positive / negative potential difference generating circuit is used for boosting, FIG. 3 in which the resistor R2 and the diode D2 are connected to the primary winding side of the transformer,
Since the voltage fluctuation on the primary winding side due to the load fluctuation is boosted and output to the secondary winding side and output, the connection of the resistor R1 and the diode D1 on the secondary winding side in FIG. Can be reduced.

In the above embodiment, the maximum value of the negative voltage is set to be larger than the maximum value of the positive voltage.
By reversing the connection direction of 1 or D2, the maximum value of the positive voltage can be made larger than the maximum value of the negative voltage.

Although a resistor is used as the voltage drop element, a choke coil may be used.

Next, a potential therapy apparatus to which the positive / negative potential difference generating circuit of the present invention is applied will be described. FIG. 4 shows the main components of the electric potential therapy apparatus. 1 is an operation unit for selecting the output time of the electric potential and the local electric potential, and selecting the magnitude of the electric potential. , A control unit for controlling the entire apparatus, 4 a transformer, 5 a power supply for supplying DC power to the control unit 3 and the like, 6, 8
Is a relay, 7 is an electric floor, 9 is an AC line connection, R3, R
4, R5 is a resistor, and D3 is a diode.

Next, the operation will be described. First, the AC line connection unit 9 is connected to an AC 100 V power supply to operate the potential therapy device.

When AC 100 V is supplied to the entire apparatus by an ON / OFF switch or the like of the apparatus, the apparatus becomes operable, and the output time is set by the timer button 1a of the operation unit 1, and the magnitude of the potential is set by the output setting button 1b. Done. Each time the setting button is pressed, the pattern is switched. For example, the output time of 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 1 hour can be sequentially changed by the timer button 1a. If the output setting button 1b is repeatedly pressed, the output voltage is set to 3000V, 600V
Output voltages of 0 V and 9000 V can be switched.

When such a setting is completed and the start / stop button 1c is pressed, the control unit 3 performs control in accordance with the set parameters, and when this button is pressed again, the output voltage is forcibly turned off.

The switching tap of the relay 6 has the transformer 4 at the top.
Output voltage 3000V, middle to 6000V, lower 9V
000V.

For example, assuming that the potential output of 6000 V is selected by the output setting button 1 b, the control unit 3 switches the tap of the relay 6 (the second tap from the top is connected to the AC 100 V line). 4 is set to 6000V. The voltage thus created is supplied to the electric floor 7.

A person to be treated exists on the electric floor 7 in a sitting state or in a sleeping state.
Is applied. The remaining time of the set high voltage application time is displayed on the display unit 2.

It is sufficient that the voltage set in the normal device is maintained within a range that does not affect the human body.
If an overvoltage occurs due to a failure of the power supply or a voltage fluctuation of the AC100V line, and an overcurrent flows through the human body, a dangerous state may occur.
A current limiting resistor R4 is provided to prevent an overcurrent from flowing.

The protection resistor R5 is provided to fix the potential of the secondary output with respect to the ground.

As described above, when an AC voltage is applied to the human body, the positive side voltage and the negative side voltage are not equal potentials, and the difference between the positive side voltage value and the negative side voltage value is larger. Since the therapeutic effect is high, so that the difference between the positive and negative voltage is provided,
A resistor R3 as a voltage drop element is connected to a terminal on the high voltage side of the secondary winding of the transformer 4, and a diode D3 is connected to a relay 8 for switching an appropriate position of the secondary winding of the transformer 4.
The other ends of the resistor R3 and the diode D3 are connected to the resistor R4.

The transformer 4, the resistor R3 and the diode D3
The component of the relay 8 is the positive / negative potential difference generating circuit described with reference to FIG. 1, and a positive / negative potential difference having a waveform as shown in FIG. 2 is generated. Thus, the relay 8 is inserted between the secondary winding side of the transformer 4 and the diode D3 in order to change the tap position of the secondary winding, as can be understood from the description of FIGS. When the upper stage of the switching tap of the relay 8 is connected, the positive / negative potential difference is small, when the middle stage is connected, the positive / negative potential difference is medium, and when the lower stage is connected, the positive / negative potential difference is large, so that the positive / negative potential difference can be changed.

The operation unit 1 is provided with a voltage difference setting button 1d for changing the positive / negative potential difference. When the voltage difference setting button 1d is sequentially pressed, the tap of the relay 8 is raised by the control unit 3, It switches between middle and bottom.

In this manner, the magnitude of the voltage applied to the human body on the electric floor 7 can be changed, and the magnitude of the positive / negative potential difference can be changed, so that the therapeutic effect can be enhanced.

Although the diode connection point on the secondary side of the transformer is switched by the relay in the above embodiment, the connection point may be switched by a slide switching mechanism.

Further, an AC voltage (about 200 V to about 800 V) is applied locally to the human body using a pen-shaped local conductor or a roller-shaped local conductor in accordance with the shape of the local body to be treated.
Even when the treatment is performed by applying V), the magnitude of the voltage applied to the local part of the human body and the magnitude of the positive / negative potential difference can be changed using the same configuration.

[0040]

As described above, according to the positive / negative potential difference generating circuit of the present invention, a very simple circuit configuration in which the voltage drop element and the diode are provided on the primary winding or the secondary winding of the transformer, A positive / negative voltage difference between the output voltages can be created, and this voltage difference can be easily varied.

[Brief description of the drawings]

FIG. 1 is a diagram showing a positive / negative potential difference generating circuit according to an embodiment of the present invention.

FIG. 2 is a diagram showing a change in an output voltage by a positive / negative potential difference generating circuit of the present invention.

FIG. 3 is a diagram showing a positive / negative potential difference generating circuit according to another embodiment of the present invention.

FIG. 4 is a diagram showing a potential therapy device using the positive / negative potential difference generating circuit of the present invention.

FIG. 5 is a diagram showing a potential therapy device using a conventional positive / negative potential difference generating circuit.

FIG. 6 is a diagram showing a change in output voltage by a conventional positive / negative potential difference generating circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-146361 (JP, A) JP-A-53-45154 (JP, A) JP-A-61-118346 (JP, U) 19512 (JP, B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) H03G 11/02 A61N 1/10

Claims (1)

(57) [Claims] 1. A transformer, a voltage drop element connected to one end of a primary winding or a secondary winding of the transformer, the other end of the voltage drop element, and a primary side of the transformer. Winding or 2
A diode connected between the secondary winding and an intermediate point of the secondary winding.