JP2003257586A - Live line automatic switching circuit - Google Patents

Abstract

(57) Abstract: Provided is an automatic hot-line switching circuit for reliably connecting a hot-line-side terminal and a conductor when connected to a commercial power supply, and a negative ion generator using the same. A rectifier circuit (31) connected to one terminal (1b) of a power plug (1), a level comparator circuit (32) connected to the rectifier circuit, and a detection signal holding circuit (33) for holding a signal of the level comparator circuit (32). Terminal 1a of the power plug,
1b and a switching circuit 34 for connecting the conductor portion 2 to the conductor portion 2. In response to a level detection signal from the detection signal holding circuit 33, the switching circuit 34 connects the terminal on the live line side to the conductor portion. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a live-line automatic switching circuit for detecting and switching a terminal on the live line side of a power plug connected to a commercial power source, and a negative ion generator using the same.

[0002]

2. Description of the Related Art Regarding negative ion effects, effects on the human body such as promotion of blood circulation and improvement of metabolism, bactericidal effects, electrostatic effects, etc. have been confirmed, and treatment tools, bedding such as mats, breeding aquariums and It is used in vase purification equipment.
In such a negative ion generator, a conductor portion formed of a plate-like body, a net-like sheet body, a heating wire or the like is set to a negative potential to generate negative ions from the conductor portion. At that time, in order to apply a high voltage to the conductor, a transformer is used to boost and rectify the voltage. As a power source for such a negative ion generator, a general commercial power source is used. However, the commercial power source has two terminals, one of which is on the live line side and the other of which is on the ground line side. It is necessary to connect the conductor part that generates negative ions with. However, it is not possible to confirm which of the two terminals of the commercial power source is the live line side from the outside, and unless the power plug of the negative ion generator is inserted, the live line terminal and the negative ion It is not possible to confirm that the generated conductor is connected.

In order to solve such a problem, for example, in Japanese Patent Laid-Open No. 3-191967, the heater is set to a negative potential regardless of the inserting direction of the power plug, and the heater is set to a negative potential. Therefore, a heating tool that generates negative ions while generating heat is described. Further, in Japanese Patent Laid-Open No. 63-59973, a negative potential generating circuit is connected to each of two terminals of a power plug, and a negative potential generating circuit that generates a smooth negative potential is connected to an electric floor body. A home electric potential therapy device is described. As another method, by connecting the terminal of the power plug to the conductor through a diode or the like, full-wave rectification is performed from the power supply to supply to the conductor regardless of which terminal is on the live line side. It has also been proposed (Japanese Patent Laid-Open No. 2000-53).
24, Japanese Patent Laid-Open No. 2001-9324).

[0004]

In the above-mentioned conventional negative ion generator, since negative ions are generated by also using carbon fibers, heating wires, etc., basically, a transformer is used to obtain a high voltage. Otherwise, there is a problem that sufficient negative ions are not generated from the conductor part. for that reason,
It is necessary to provide a transformer space inside the device, which makes the device itself large, and also makes the entire device heavy. Further, since the transformer is used, the power consumption is increased and the circuit design is also restricted, so that the complicated circuit configuration as in the above-described conventional technique is inevitable. Furthermore, in order to make the voltage high, it is necessary to take safety measures against electric shock. Even in the method of performing full-wave rectification using a diode, power consumption increases and a voltage drop is inevitable. Due to the voltage drop, negative ions cannot be sufficiently generated in the conductor portion. In order to overcome these drawbacks of conventional negative ion generators, by using a non-woven fabric made of copper fiber as a conductor part for generating negative ions, it is possible to use conventional negative ion generators without using a high voltage transformer. It is possible to generate the same amount of negative ions as the generator.

It is an object of the present invention to provide a live-line automatic switching circuit suitable for a negative ion generating device which does not require such a transformer, and a negative ion generating device equipped with the circuit.

[0006]

SUMMARY OF THE INVENTION An automatic hot-line switching circuit according to the present invention includes a rectifier circuit connected to one terminal of a power plug, a level detection circuit connected to the rectifier circuit, and a power plug of the power plug. A switching circuit connecting either one or the other terminal and the conductor portion is provided, wherein the switching circuit is responsive to a high level detection signal from the level detection circuit and the one terminal of the power plug and the conductor. And connecting the other terminal of the power plug and the conductor in response to a low level detection signal from the level detection circuit. The negative ion generator according to the present invention includes a live-line automatic switching circuit, a power plug connected to the live-line automatic switching circuit, and a conductor portion connected to the live-line automatic switching circuit. It is characterized in that negative ions are generated by applying a negative potential to the part.

With the above structure, when the power plug is arbitrarily inserted into a commercial power source, the terminal on the live line side of the power plug and the conductor portion are surely connected, and Since it is not necessary to generate a high voltage by the transformer, it is possible to achieve such an effect with a simple circuit configuration. Further, since the terminal of the power plug and the conductor portion are connected without passing through a diode or the like, it is possible to reduce power consumption and avoid high voltage. As described above, it is possible to provide a live-line automatic switching circuit that reliably connects a terminal on the live-line side and a conductor portion with a simple circuit configuration, and to provide a safe negative ion generator that does not generate high voltage. Can be provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. FIG. 1 is a block diagram of an automatic hot-line switching circuit. The hot-line automatic switching circuit 3 is connected to the rectifier circuit 31 connected to the terminal 1b of the two terminals 1a and 1b of the power plug 1, the level comparison circuit 32 connected to the rectification circuit 31, and the level comparison circuit 32. The detection signal holding circuit 33 and the switching circuit 34. The level comparison circuit 32 and the detection signal holding circuit 33 correspond to the level detection circuit of the present invention. The switching circuit 34 includes a conductor portion 2 and a terminal 1a,
It operates so as to be connected to any terminal of 1b. A power-on timer circuit 36 is connected to the switching circuit 34, and sends a signal for operating the switching circuit 34 at a predetermined timing after the power is turned on. Power-on timer circuit 3
A gate 35 is provided between the switch 6 and the switching circuit 34, and the gate 35 disconnects the connection between the power-on timer circuit 36 and the switching circuit 34 in response to the output signal from the detection signal holding circuit 33. To do. Here, the conductor portion 2 is, for example,
A conductor in various forms such as a plate-like body made of a conductive material, a sheet body made of conductive fibers, and a sheet body formed by wiring a conductive wire can be used without any particular limitation. Although not shown, the conductor portion 2 is configured to generate negative ions based on the negative potential rectified by the rectifier circuit when connected to the commercial power source as in the conventional technique.

In the initial state in which the power plug 1 is not inserted into the commercial power source, the switching circuit 34 is in the off state and the terminal 1 is in the off state.
It is designed to be connected to b. Then, when the power plug 1 is inserted into the commercial power source and the power is turned on by a power switch (not shown), (A) the terminal 1a is on the live line side and the terminal 1b is on the ground line side (B). ) Terminal 1
In some cases, a is the ground line side and terminal 1b is the live line side.

The operation in the case of (A) will be described. First, since the rectifier circuit 31 is connected to the terminal 1b, the rectifier circuit 31 is located on the ground line side, and no signal is output from the rectifier circuit 31. Since no signal is output from the rectifier circuit 31, the level comparison circuit 32 and the detection signal holding circuit 33 do not operate (output of a low level detection signal), and the gate 35 connects the power-on timer circuit 36 and the switching circuit 34. Maintain the condition.
On the other hand, the power-on timer circuit 36 outputs a signal for operating the switching circuit 34 at a predetermined timing,
From the gate 35 to the switching circuit 34, the switching circuit 34
Performs a switching operation so as to connect the terminal 1a and the conductor portion 2. Therefore, the terminal 1a on the live line side and the conductor portion 2 are connected to generate negative ions.

In the case of (B), since the terminal 1b is on the live line side, the rectifier circuit 31 outputs a signal. The level comparison circuit 32 outputs a level detection signal in response to the signal from the rectifier circuit 31, and the detection signal holding circuit 33 operates in response to the detection signal (output of a high level detection signal).
Once activated, the detection signal holding circuit 33 continues to output a signal to the gate 35 until the power is cut off. Therefore, since the connection between the power-on timer circuit 36 and the switching circuit 34 is cut off until the power is cut off by the gate 35, the signal output from the power-on timer circuit 36 at a predetermined timing is sent to the switching circuit 34. The switching circuit 34 is not sent out, and is kept in the initial state where the terminal 1b and the conductor portion 2 are connected. In this way, the terminal 1b on the live line side and the conductor portion 2 are connected to generate negative ions.

As described above, even if the power plug is arbitrarily inserted into the commercial power source, in any case, the conductor portion 2 is connected to the terminal on the live line side to generate negative ions. Although the switching circuit 34 is operated by using the gate 35 and the power-on timer circuit 36 in the above-described embodiment, the switching circuit 34 is directly operated by a signal from the level detection circuit (the level comparison circuit 32 and the detection signal holding circuit 33). The switching circuit 34 may be operated, and if the switching circuit operates based on the high level detection signal or the low level detection signal from the level detection circuit, the circuit configuration other than the above-described embodiment may be used.

FIG. 2 shows an example of a simplified circuit configuration of the hot-line automatic switching circuit. Protective resistors R1 and R2 are respectively connected to the two terminals 1a and 1b of the power plug 1, and an operational amplifier OP1 is connected to the terminal 1b side via a capacitor C1. On the output side of the operational amplifier OP1, a Zener diode ZD1 and a thyristor S are provided.
CR1 is connected. The operational amplifier OP2 is connected to the thyristor SCR1, and the gate of the transistor Q1 is connected to the output side of the operational amplifier OP2. The emitter of the transistor Q1 is grounded and the collector is a relay R.
It is connected to Y1. The relay RY1 has terminals 1a, 1
Any one of b is connected to the conductor portion 2,
In the initial state where the power is not turned on, the terminal 1b and the conductor portion 2 are set to be connected.

When the terminal 1b is on the hot side when the power plug 1 is inserted, the sine wave voltage generated across R2 is input to the operational amplifier OP1 through the capacitor C1 and amplified and half-wave rectified. The half-wave rectified voltage is
Voltage of Zener diode ZD1 and thyristor SCR
When it is larger than the value obtained by adding the gate voltage of 1, the thyristor SCR1 is turned on, no signal is generated at the output side of the operational amplifier OP2, and the transistor Q1 remains closed and the relay R
No current flows in Y1. Therefore, relay RY1 maintains the state in which terminal 1b and conductor portion 2 are connected.

When the terminal 1a is on the hot side when the power plug 1 is inserted, no voltage is generated across the resistor R2, and only a small half-wave rectified voltage is generated on the output side of the operational amplifier OP1. Since the thyristor SCR1 remains off, the operational amplifier OP2 outputs a signal to the output side at a predetermined timing after the power is turned on, and the transistor Q1 is turned on. A current flows through the relay RY1 so that the terminal 1a and the conductor portion 2 are connected to each other. In this way, the conductor portion 2 and the live wire side terminal 1a are connected.

In the above embodiment, the capacitor C1
The operational amplifier OP1 corresponds to a rectifier circuit, the Zener diode ZD1 and the thyristor SCR1 correspond to a level detection circuit, and the relay RY1 corresponds to a switching circuit.

[0017]

As described above, the live-line automatic switching circuit according to the present invention and the negative ion generator using the same can be used when the power plug is arbitrarily inserted into a commercial power source. Since the terminal on the side and the conductor portion are now reliably connected and it is not necessary to generate a high voltage by the transformer, it is possible to achieve such an effect with a simple circuit configuration. Further, since the terminal of the power plug and the conductor portion are connected to each other without using a diode or the like, power consumption can be reduced and a high voltage is not generated, so that the device can be used safely.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention.

FIG. 2 is a circuit diagram of an embodiment according to the present invention.

[Explanation of symbols]

1 power plug 1a Power plug terminal 1b Power plug terminal 2 conductor 3 Live line automatic switching circuit 31 Rectifier circuit 32 level comparison circuit 33 Detection signal holding circuit 34 Switching circuit 35 gates 36 Power-on timer circuit

Claims (2)

[Claims] 1. A rectifier circuit connected to one terminal of a power plug, a level detection circuit connected to the rectifier circuit, and one or other terminal of the power plug and a conductor portion are connected. A switching circuit, wherein the switching circuit connects one terminal of the power plug and the conductor portion in response to a high level detection signal from the level detection circuit, and detects the low level from the level detection circuit. A live-line automatic switching circuit, wherein the other terminal of the power plug is connected to the conductor portion in response to a signal. 2. The live-line automatic switching circuit according to claim 1, a power source plug connected to the live-line automatic switching circuit, and a conductor portion connected to the live-line automatic switching circuit. A negative ion generator characterized by generating negative ions by setting a negative potential.