JP2003315380A - Polarity discriminator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] An LED lamp can be driven to emit light,
Provided is a polarity discrimination device that can suppress erroneous discrimination when performing polarity discrimination. A polarity discriminating device includes a voltage side plug connected to a measurement terminal of an outlet and a ground side plug.
Touch terminal 1 that is connected from the
7 is provided. A polarity display circuit W for driving the polarity display LED lamp 15 to emit light based on the switching operation is connected in series to the switching circuit T. A constant voltage circuit N for supplying a voltage is connected to the polarity display circuit W. The polarity display circuit W is connected to an on / off circuit U for turning on / off the voltage supply from the constant voltage circuit N by on / off operation of a signal output from the switching circuit T. The on / off circuit U is connected to an LED display circuit V for driving the polarity display LED lamp 15 to emit light by voltage supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarity discriminating apparatus for discriminating the polarity of a connection terminal on the voltage side or the ground side of a household outlet, for example. More specifically, the present invention relates to a polarity discriminating apparatus that can emit light from a light emitting diode (LED) lamp and can suppress erroneous discrimination when performing polarity discrimination.

[0002]

2. Description of the Related Art The wiring connected to an outlet for a house is required to be a polar wiring in a grounding type distribution line, and an electric wire on the grounding side is usually connected to a deep hole located on the left side of the outlet, The electric wire on the voltage side is connected to the shallow hole on the right side. After the wiring work to the outlet, the work of checking the suitability of the wiring, that is, the work of determining the polarity is performed.

A polarity discriminating apparatus for discriminating such a polarity is disclosed in, for example, Japanese Utility Model Laid-Open No. 2-109269. Since this polarity discriminating device is a device that discriminates the polarity by causing the neon lamp to emit light by a current flowing through the human body as a ground, it is necessary to provide a large electric resistance in the polarity discriminating circuit to weaken the current flowing through the device. is there.

[0004]

However, in order to drive the neon lamp with such a weak current, a Darlington circuit in which a plurality of transistors are connected in series is used to amplify the weak current and light the neon lamp. I am trying. Like the polarity determination circuit above,
A neon lamp is most suitable for a circuit having a large voltage of 100 V or 200 V and a small current. However,
Since the neon lamp has a low illuminance, there is a problem that there is a possibility of misjudgment when the polarity is discriminated in a bright place.

On the other hand, if an LED lamp is used, a high illuminance can be obtained, but since this LED lamp can be used only in an electric circuit having a small voltage and a large current, it is difficult to use it in a polarity discriminating circuit. there were.

The present invention has been made by paying attention to the problems existing in the prior art as described above. It is an object of the invention to provide a polarity discriminating device capable of driving an LED lamp to emit light and suppressing erroneous discrimination when performing polarity discrimination.

[0007]

In order to achieve the above object, the polarity discriminating apparatus according to the invention of claim 1 discriminates the polarity between the voltage side and the ground side at a measuring terminal to which a voltage is applied. A polarity determination device for operating a touch terminal provided through a protective resistor from a measurement terminal, a switching circuit that performs a switching operation when a part of a human body touches the touch terminal, and the switching circuit is connected. The light emitting diode (LE
D) has a polarity display circuit for driving to emit light, and a constant voltage circuit for supplying a voltage to the polarity display circuit, and the polarity display circuit outputs a signal output from the switching circuit by turning on / off the signal from the constant voltage circuit. An on / off circuit for turning on / off the voltage supply and an LED display circuit for driving the LED to emit light by the voltage supply are provided.

According to a second aspect of the present invention, there is provided a polarity determining device,
In the invention according to claim 1, the constant voltage circuit includes an AD converter that converts an AC voltage from the measurement terminal into a DC voltage, and the DC voltage converted by the AD converter is supplied to the polarity display circuit. It is composed of.

According to a third aspect of the present invention, there is provided a polarity determining device,
In the invention according to claim 1 or 2, the constant voltage circuit is configured by a voltage determination circuit that determines a voltage applied between the voltage side of the measurement terminal and the ground side.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the polarity discriminating apparatus of the present invention will be described below in detail with reference to the drawings. Indoor wiring to which a voltage of 100 V or 200 V is applied is connected to the measurement terminals of a plurality of outlets installed indoors or outdoors in a house. Each outlet is provided with a voltage side terminal as a measurement terminal, a ground side terminal, and if necessary, a ground terminal. In general, the ground side terminal of the deep hole located on the left side of the outlet is connected to the ground side wiring, and the voltage side terminal of the shallow hole located on the right side is connected to the voltage side wiring.

The polarity discriminating device 11 is a device for discriminating the polarity of whether the voltage side terminal and the ground side terminal are the voltage side to which the wiring voltage is applied or the ground side. The polarity determination device 11 will be described below.

As shown in FIG. 2, the polarity discriminating device 11 has a rod-like shape, and a pair of voltage side plugs 12 and ground side plugs 13 as projecting plugs project from the tip of the polarity discriminating device 11. It can be electrically connected by inserting it into the ground terminal and the ground terminal. Further, a grounding plug (not shown) as a measuring plug is provided at the tip of the polarity discriminating device 11 so as to be electrically connected to a grounding terminal of an outlet having a grounding terminal.

On the base end side of the polarity discriminating device 11, a voltage detection display LED lamp 14, a polarity display LED lamp 15 and a grounding display LED lamp 16 are arranged in this order. You can do it. A touch terminal 17 for distinguishing the polarity by touching a finger, which is a part of the human body, on the base end side of these LED lamps.
Is provided. A control knob 18 that adjusts the volume of the buzzer that sounds when a voltage is detected on the base side of the touch terminal 17
Is installed. A 200V neon lamp 19 that is turned on when 200V is detected is disposed on the base end side of the adjusting knob 18. Next, the electrical configuration of the polarity determination device 11 will be described.

As shown in FIG. 1, a diode 20 is provided between the voltage-side plug 12 and the ground-side plug 13 for AD.
A converter 21 is connected to convert an alternating current applied between the voltage side plug 12 and the ground side plug 13 into a direct current. A first Zener diode 22 and a first Zener diode 22 are provided between the AD converter 21 and the ground side plug 13.
Resistance (In this specification, electrical resistance is simply called resistance) 23
Are connected in series, one end of the DC branch line 24 is connected between them, and the other end of the DC branch line 24 is connected to the buzzer circuit M.

A pair of constant voltage terminals 25 are provided between the DC branch line 24 and the ground side plug 13. The A
The D converter 21, the first resistor 23, the first Zener diode 22, and the pair of constant voltage terminals 25 form a constant voltage circuit N.
And a constant DC voltage is generated between the pair of constant voltage terminals 25. That is, the constant voltage circuit N is a voltage determination circuit that determines the voltage applied between the voltage side terminal and the ground side terminal.

The circuit in which the LED 14 for indication of electric detection and the second resistor 26 are connected in series is connected in parallel to the pair of terminals 25 for constant voltage. In addition to the constant voltage circuit N, the voltage detection circuit P is configured by connecting in parallel a circuit in which the voltage detection display LED 14 and the second resistor 26 are connected in series. Then, when a voltage of 100 V is applied to the voltage side plug 12 with respect to the ground side plug 13, the AC current is converted into a DC current by the AD converter 21 and, for example, between the pair of constant voltage terminals 25, 3. A voltage of 3V is generated.
At the same time, a direct current flows through the LED lamp 14 for indication of electric current through the second resistor 26 to emit light, and it is possible to detect that each wiring connection between the voltage side terminal and the ground side terminal is normal. ing.

A third circuit is provided between the detection circuit P and the buzzer circuit M.
The resistor 27 and the ground display LED lamp 16 are connected in series, one end of which is connected to the DC branch line 24, and the other end of which is opened as a ground plug 29. These third resistors 2
7, the grounding LED lamp 16 and the grounding plug 29 constitute a grounding circuit Q. Then, the voltage side plug 12 is connected to the voltage side terminal, the grounding plug 29 is connected to the grounding terminal, a direct current flows through the grounding circuit Q, and the grounding display LED lamp 16 emits light, whereby the grounding terminal becomes normal It can detect that it is grounded.

The buzzer circuit M is constructed by connecting an oscillation circuit 30, a variable resistor 31, and a buzzer 32 in series. Then, a voltage is generated in the constant voltage circuit N, or the voltage detection display LED lamp 14 of the voltage detection circuit P emits light, or the grounding display LED lamp 16 of the grounding circuit Q.
When is emitted, a current also flows through the buzzer circuit M, and the buzzer 32 sounds. The variable resistor 31
Is for adjusting the amount of sound of the buzzer 32 by rotating the adjusting knob 18 to adjust the current flowing through the buzzer 32.

Next, the voltage side plug 12 and the ground side plug 1
A 200 V voltage detection circuit R is provided between the voltage detector 3 and the voltage detector 3.
This 200V detection circuit R includes both Zener diodes 3
3 and the third resistor 27 are connected in series to drop the voltage, and the 200V neon lamp 19 and the fourth resistor 34 are connected.
Is connected in parallel to the third resistor 27. And the voltage side plug 12
When a voltage of 200V is applied between the grounding side plug 13 and the grounding side plug 13, a current flows through the 200V neon lamp 19 to turn on the light.

A voltage discriminating circuit S is constituted by the above-mentioned voltage detecting circuit P, grounding circuit Q, buzzer circuit M, and 200 V voltage detecting circuit R. Further, a fifth resistor 35 and a second Zener diode 36 are connected in series between the voltage side plug 12 and the ground side plug 13 to drop the voltage. One end of a branch connection line 37 is connected between the fifth resistor 35 and the second Zener diode 36, and the other end serves as a touch terminal 17 that a human finger touches via a protection resistor 38 having a large resistance value. There is. Between the branch connection line 37 and the ground side plug 13, a polarity discriminating transistor 3 is provided.
9, the sixth resistor 40 and the third Zener diode 41 are connected in series.

Capacitor 42, fourth Zener diode 4
The third and seventh resistors 44 are connected in parallel with the polarity discriminating transistor 39. These polarity discrimination transistors 3
9, capacitor 42, fourth Zener diode 43, seventh
The switching circuit T is configured by the resistor 44, the protection resistor 38, and the touch terminal 17. The fifth resistor 35 and the second Zener diode 36 are for preventing an excessive voltage from being applied to the switching circuit T. For example, 75V is applied to the second Zener diode 36 and the remaining voltage is 5 resistor 35 is applied.

The emitter terminal of the polarity discriminating transistor 39 is connected to the branch connection line 37, the base terminal is connected to the touch terminal 17 side, and the collector terminal is connected to the sixth resistor 40. Further, the capacitor 42 is for absorbing noise generated when a human finger touches the touch terminal 17 and preventing the polarity discriminating transistor 39 from malfunctioning due to noise. The fourth Zener diode 43 prevents the polarity discriminating transistor 39 from being damaged by an excessive voltage applied between the emitter terminal and the base terminal of the polarity discriminating transistor 39. When the touch terminal 17 is touched by a person's finger, a minute current flows from the emitter terminal of the polarity discriminating transistor 39 to the base terminal so that the polarity discriminating transistor 39 performs a switching operation.

Further, the two inverter ICs 45, the eighth resistor 46, and the base terminal of the LED display transistor 47 are connected in series, which is the third Zener diode 41.
Are connected in parallel. These LED display transistor 47, third Zener diode 41, and inverter I
An on / off circuit U is configured by C45 and the like, and the on / off operation is performed based on the switching operation of the polarity determining transistor 39.

Further, at the collector terminal of the LED display transistor 47, the polarity display LED lamp 15 and the ninth LED lamp are provided.
The resistor 48 is connected in series, and its tip portion serves as a voltage supply terminal 49. The voltage supply terminal 49
By connecting the constant voltage terminal 25 of the constant voltage circuit N to the, a DC voltage of 3.3 V, for example, is applied between the voltage supply terminal 49 and the grounding side plug 13, and the polarity display LED lamp 15 is applied. It is designed to emit light by being supplied with a direct current. The LED display circuit V is constituted by the polarity display LED lamp 15, the ninth resistor 48 and the voltage supply terminal 49.

On the other hand, the emitter terminal of the LED display transistor 47 is connected to the third Zener diode 41 and the ground side plug 13. And the on / off circuit U
The LED display circuit V and the LED display circuit V constitute a polarity display circuit W. Further, the polarity display circuit W and the switching circuit T constitute a polarity discriminating circuit X.

When a human finger touches the touch terminal 17 while an AC voltage of 100 V or 200 V is applied to the voltage side plug 12 with respect to the ground side plug 13, the polarity discriminating transistor 39 performs a switching operation. To do.
Based on the switching operation, the on / off circuit U is turned on, a current of 30 mA, for example, flows in the polarity display LED lamp 15 to emit light, and the polarities of the voltage side terminal and the ground side terminal can be determined.

Next, the operation of the polarity discriminating apparatus 11 of this embodiment will be described. When determining the polarity of whether the voltage side terminal and the ground side terminal of the outlet are the voltage side or the ground side, the voltage side plug 12 and the ground side plug 13 of the polarity discriminating device 11 are connected to each other. Inserted in the hole. When a finger touches the touch terminal 17 provided on the base end side of the polarity determination device 11 in that state, the voltage is dropped by the second Zener diode 36 and the fifth resistor 35, and the current is dropped by the protection resistor 38. A minute current flows through the switching circuit T.

That is, a minute current flows from the emitter of the polarity discriminating transistor 39 to the base, and the polarity discriminating transistor 39 performs a switching operation. Based on this switching operation, a small current flows from the base of the LED display transistor 47 of the on / off circuit U to the emitter, so that the LED display transistor 47 turns on. At this time, since the voltage supply terminal 49 is connected to the constant voltage terminal 25, a small voltage of, for example, 3.3 V is applied between the voltage supply terminal 49 and the grounding side plug 13 to display the polarity. A large current of, for example, 30 mA can be passed through the LED lamp 15.

Therefore, the polarity display LED lamp 15 can be driven to emit light, and since the polarity display LED lamp 15 is brighter than the conventional neon lamp, it can be visually recognized even in a bright place in the daytime. As a result, the polarity discrimination, that is, the voltage side terminal of the outlet is the voltage side,
It can be surely determined that the ground side terminal is the ground side.

The effects exerted by the above-described embodiment will be summarized and described below. The polarity determination device 11 of the embodiment drives the switching circuit T having the touch terminal 17 and the ON / OFF circuit U based on the switching operation of the switching circuit T to drive the LED lamp 15 for polarity display to emit light. W and a constant voltage circuit N for supplying a voltage to the polarity display circuit W. Therefore, by touching the touch terminal 17 with a finger, the switching circuit T and further the on / off circuit U can be operated to drive the polarity display LED lamp 15 of the polarity display circuit W to emit light. Since the polarity display LED lamp 15 is brighter than the conventional neon lamp, it is possible to suppress erroneous discrimination in polarity discrimination even in a bright place in the daytime.

Further, the constant voltage circuit N includes an AD converter 21 for converting an AC voltage applied between the voltage side plug 12 and the ground side plug 13 into a DC voltage, and the AD converter 21
The DC voltage converted by the converter 21 is supplied to the polarity display circuit W. Therefore, the AC voltage is converted into a DC voltage by the AD converter 21, and the DC voltage can drive the polarity display LED lamp 15, the voltage detection display LED lamp 14, the ground display LED lamp 16 and the like to emit light.

Further, the constant voltage circuit N is configured as a voltage determination circuit S that determines the voltage applied between the voltage side and the ground side of the measurement terminal of the outlet.
Therefore, the polarity determination device 11 generates a constant voltage in the constant voltage circuit N in addition to the polarity determination, so that the voltage applied between the voltage side of the measurement terminal and the ground side, for example, 10
A voltage of 0V can be discriminated.

To determine that a voltage of 100 V is applied between the measurement terminals on the voltage side and the ground side by causing a direct current to flow through the LED lamp 14 for display of electric detection of the electric detection circuit P to emit light. You can

It is possible to determine that the ground terminal of the outlet is grounded by a direct current flowing through the grounding LED lamp 16 of the grounding circuit Q and causing it to emit light.

To determine that a voltage of 200V is applied between the measurement terminals on the voltage side and the ground side by the AC current flowing through the 200V neon lamp 19 of the 200V detection circuit R to light up. You can

The embodiment can be modified and embodied as follows. In the above embodiment, the voltage discrimination circuit S is omitted,
The polarity discriminating device 11 may be composed of only the polarity discriminating circuit X.

In place of the constant voltage circuit N connected to the voltage supply terminal 49 for causing the LED lamp 15 for displaying polarity to emit light, another DC power source such as a battery can be used.

200 in the detection circuit R for 200 V
The circuit configuration may be changed so that the V neon lamp 19 can be changed to an LED lamp. The polarity discriminating device 11 may be provided with a plurality of pairs of voltage side plugs 12 and ground side plugs 13, and a plurality of polarity discriminating circuits X and voltage discriminating circuits S may be provided correspondingly. In that case, the polarities and voltages of a plurality of pairs of measuring terminals of the outlet can be simultaneously determined.

The measuring terminal may be any terminal as long as it is a terminal to which a voltage of 100 V or 200 V is applied, other than the terminal of a household outlet. Further, the technical idea that can be understood from the above-described embodiment will be described below.

A circuit in which a voltage detection display LED and a resistor are connected in series is connected in parallel to a constant voltage circuit to form a voltage detection circuit, and a DC current flows through the voltage detection display LED to detect the voltage detection display LED. The polarity determination device according to claim 2, wherein the lamp is configured to emit light. With such a configuration, when a predetermined voltage is applied between the measurement terminals, it can be detected to cause the LED lamp to emit light.

A circuit in which an LED for grounding display and a resistor are connected in series is connected in parallel to a constant voltage circuit, and LE for grounding display is used.
The polarity discriminating apparatus according to claim 2 or 3, wherein the grounding LED lamp emits light when a direct current flows through D. With such a configuration, when the ground terminal is grounded, it can be detected to cause the LED lamp to emit light.

Using the polarity discriminating device according to claim 1, after connecting the measuring plug to the measuring terminal and touching the touch terminal with a finger, the LED of the LED display circuit is driven to emit light. How to determine the polarity. According to this method, erroneous determination can be suppressed when the LED lamp is driven to emit light and polarity determination is performed.

[0043]

As described in detail above, the present invention has the following effects. According to the polarity determining device of the invention described in claim 1, the LED lamp can be driven to emit light, and erroneous determination can be suppressed when the polarity determination is performed.

According to the polarity determining device of the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the alternating current is converted into the direct current, and the direct current causes the LED lamp for displaying the polarity. It can be driven to emit light.

According to the polarity determining device of the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, in addition to the effect that the constant voltage circuit generates a constant voltage, the measuring terminal It is possible to determine the voltage applied between the voltage side and the ground side.

[Brief description of drawings]

FIG. 1 is an electrical circuit diagram showing an electrical configuration of a polarity determination device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a polarity determination device.

[Explanation of symbols]

11 ... Polarity determination device, 12 ... Voltage side plug as measurement plug, 13 ... Ground side plug as measurement plug,
15 ... LED lamp for polarity display, 17 ... touch terminal, 2
1 ... AD converter, 38 ... Protection resistor, N ... Constant voltage circuit, T ... Switching circuit, U ... On / off circuit, V ... L
ED display circuit, W ... Polarity display circuit.

Claims (3)

[Claims] 1. A polarity discriminating device for discriminating between a voltage side and a ground side of a measuring terminal to which a voltage is applied, which is connected from a measuring plug connected to the measuring terminal through a protective resistor. A touch terminal, a switching circuit that performs a switching operation when a part of a human body touches the touch terminal, and a polarity display circuit that is connected to the switching circuit and drives a light emitting diode (LED) to emit light based on the switching operation. And a constant voltage circuit that supplies a voltage to the polarity display circuit, wherein the polarity display circuit turns on and off the voltage supply from the constant voltage circuit by turning on and off the signal output from the switching circuit, and A polarity discriminating apparatus comprising: an LED display circuit that drives an LED to emit light by supplying the voltage. 2. The constant voltage circuit includes an AD converter for converting an AC voltage from a measurement terminal into a DC voltage,
The polarity discriminating device according to claim 1, wherein the DC voltage converted by the D converter is configured to be supplied to the polarity display circuit. 3. The polarity discriminating circuit according to claim 1, wherein the constant voltage circuit is configured as a voltage discriminating circuit for discriminating a voltage applied between the voltage side of the measurement terminal and the ground side. apparatus.