JPS6031729Y2 - Commercial power supply ground line detection device for negative potential therapy equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that detects and displays the polarity of a plug of a negative potential therapy device that is inserted into a commercial power source.

When performing treatment with a DC-type negative potential therapy device, there are those that require two electrodes, a treatment conductor and a grounding conductor, and those that return one side to the commercial power supply and perform treatment with only the treatment conductor. There is something.

In the former case, it is difficult to securely ground the building depending on the structure of the building, and it is also difficult to determine whether the grounding is complete.

In the latter case, due to the difference in the direction in which the plug is inserted into the commercial power outlet, the waveform of the commercial power supply is added to the output, and the normal therapeutic effect may not be obtained.

For this reason, some systems reduce the influence by feeding back to the midpoint of the commercial power supply, but AC5QV voltage is still output, which is not preferable.

Therefore, a voltage detector such as a neon tube was used to determine the ground side of the commercial power supply, but the luminance of the neon tube itself was low, making it difficult to distinguish, and the AC outlet plug of the treatment device itself was not polarized. This has the disadvantage that it requires display and is also complicated to handle.

The purpose of the present invention is to eliminate these conventional drawbacks and provide a device that detects and displays the polarity of the power supply simply by touching the check plate provided on the treatment device body with a finger or the like. be.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Figure 1 shows an example of a circuit for implementing the present invention. In the figure, 1 is a plug plugged into an AC outlet, 2 is a primary circuit of a transformer T1, and 3 is a secondary circuit of a transformer T1. 4 is an output terminal for outputting a therapeutic voltage, and 5 is a positive line of the therapeutic voltage generating circuit 3 connected to a transformer T.
A feedback circuit for feeding back to one line (hereinafter referred to as a feedback line) 6 of the primary side circuit 2 of 1, 7 is a non-feedback line, 8
is an amplifier circuit configured on the secondary side of the transformer T2, and 9 is a check plate connected to the input terminal of the amplifier circuit 8.

Below, sw1 is a power switch, sw2 is a treatment turn-on switch, F is a fuse, R1-R23 are fixed or variable resistors, N1-N3 are neon lamps, C1-C3 are capacitors, D1-D5 are diodes, Q1-Q3 are Transistor and LED indicate a light emitting diode.

The operation of this embodiment circuit will be explained below.

Now, with the power switch SW1 turned on and the treatment turn-on switch SW2 opened, if the plug 1 is inserted into the commercial power outlet with the correct polarity, that is, the return line 6 is connected to the ground line of the commercial power supply. The case will be explained using the equivalent circuit shown in FIG.

That is, when a part of the human body such as a finger touches the check plate 9, the check plate 9 becomes at ground potential.

Therefore, when the commercial power supply voltage is E (= Emcosωt) and the inductance of the transformer T1 is L, the voltage equation of the primary circuit of the transformer is as follows.

E = Emcos ωt = R2i +Ldi/d
t Therefore, the current i flowing through the circuit is:

i = (Em/ JR2”10ω”L2) cos (
ω) (However, φ=j3n-” (ωL/R2))
Therefore, the potential Ea at point a is as follows.

Ea1=R2i = (Em/ J 1 +ω”L”/R22) CO3
((1) t −φ) Here, since R2 has a high resistance and ωL<<R2,
It can be approximated as Ea1=EmCO8ωt.

The potential Ea at point a is the emitter potential of the transistor Q1 in the equivalent circuit shown in FIG.

Therefore, in the negative half cycle of the power supply frequency, the emitter potential of transistor Q1 becomes lower than the base potential,
Transistor Q1 is in an on state.

Therefore, transistor Q2. Q3 also turns on, and the collector output of Q3 becomes a rectangular wave with the same period as the power supply frequency, and Q3
A rectangular wave current at the power supply frequency flows through the LED, which is the load No. 3, and the LED is turned on.

That is, the fact that the plug is inserted into the commercial power outlet with the correct polarity is notified by lighting the LED, and the user can turn on SW2 and receive treatment.

Next, if the same (SW1 is turned on and SW2 is open, plug 1 is inserted into a commercial power outlet with reverse polarity, that is, line 7 is the grounding line of the commercial power supply) When the check plate 9 is touched with a part of the human body such as a finger, a connection state as shown in the equivalent circuit of FIG. 3 is established.

The potential Ea2 at point a in this diagram is Ea2=ωLi = (Em/!R2”/6J”L”+1) CO
3(6) -φ) Here, since R2 has a high resistance, Ea2-;Q
becomes.

Therefore, the emitter potential of the transistor Q1 is approximately equal to the ground potential, and the base potential is the same potential as the check plate that is grounded by the human body, so no base current flows to the transistor Q1, which is the input of the amplifier circuit 8. Ql is off, Q2. Q3 is also off, so no current flows through the LED, which is the load of Q3, and it does not light up.

In other words, the fact that the plug is inserted into a commercial power outlet with reverse polarity will be notified by the LED not lighting up, and the user can receive treatment by replacing the plug with the opposite polarity and turning on SW2. It is.

In addition, in the example, the LED is configured so that it lights up when the plug is inserted into a commercial power outlet with the correct polarity.
It is also possible to have a configuration in which the light is turned on when the polarity is reversed, instead of being turned on.

As mentioned above, according to the present invention, it is possible to detect whether the polarity of the power supply is correct by simply touching a part of the human body such as a finger to the check plate provided on the treatment device body, and to notify the user by displaying the correct polarity. This has the effect of making it possible.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an embodiment of the present invention, Figures 2 and 3 are circuit diagrams showing an embodiment of the present invention.
Each figure is an equivalent circuit diagram explaining the operation of the present invention. 1...Plug, 2...Transformer T
1 primary side circuit, 3... treatment voltage generation circuit, 4
...Output terminal, 5...Feedback circuit, 6...Feedback line, 7...Non-feedback line, End...Amplification circuit, 9・・・・・・Check plate.

Claims (1)

[Claims for Utility Model Registration] The primary side terminal of the transformer T1 is connected to the plug 1 for receiving power from a commercial power outlet, and the transformer T1
A negative potential treatment device in which a negative potential generation circuit 3 is formed on the secondary side of the transformer, and the positive line of the negative potential generation circuit 3 is connected to one line 6 of the primary side line of the transformer via a feedback circuit 5. between the plug 1 side of the one line 6 on the primary side of the transformer T1 and the one primary side terminal of the transformer T1,
A treatment turn-on switch SW2 that is operated to turn on during treatment is connected in series, a high resistance circuit is connected in parallel to the switch, and it is driven by a separate power source independent of the transformer T1,
An amplifier circuit 8 has one power supply line connected to a connection point a between the switch sw2 on the primary side of the transformer T1 and the primary terminal of the transformer T1, and a check plate 9 for detecting power supply polarity is connected to the input terminal of the amplifier circuit 8. 1. A ground side line detection device for a commercial power source in a negative potential therapy device, characterized in that a light emitting element, a buzzer, or other alarm device is connected to the output terminal.