JPH0712935Y2 - High and low voltage detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high and low voltage detector, and more particularly to a high and low voltage detector which can be commonly used for high and low voltage detection for detecting whether or not an AC circuit is charged.

[0002]

2. Description of the Related Art An electric detector is generally used to detect the presence or absence of charging of an AC electric circuit. This voltage detector is composed of a voltage detection unit that detects whether or not the AC circuit is charged, and a stretchable insulating rod that extends from the base end of the voltage detection unit. A metal detection metal fitting is attached to the tip of the power detection unit, and the power detection unit is electrically coupled by locking the detection metal fitting in the AC electric path. The detection unit has a built-in detection circuit electrically connected to the detection fitting, and detects whether or not the AC circuit is charged by the input voltage of the detection fitting. Further, the power detection unit is provided with a light emitting diode and a lamp, and the detection output of the detection circuit notifies the charging state of the AC circuit by its sound and light emission. Next, the insulating rod is expandable and contractible as described above, and the grip portion is provided at the base end thereof.

When using the voltage detector having the above structure, first, the inspector extends the insulating rod while holding the grip portion at the base end of the insulating rod. Due to the extension of the insulating rod, the power of the detection circuit is automatically turned on in the power detection unit, and a standby state is entered after a power detection test is performed to determine whether the detection circuit operates normally. At this time, in the conventional voltage detector, it is tested whether the detection circuit operates normally in the high voltage detection state. If it is normal, the buzzer sounds continuously and the light emitting diode is continuously turned on. Light up. After this test, the buzzer is briefly and intermittently sounded and the light emitting diode is intermittently blinked so that the inspector can recognize that it is ready for use as a standby state.

At this stage, the inspector locks the detection metal fitting of the power detection section to the AC circuit to be inspected. As a result, if the AC circuit is in a high-voltage charging state, it is detected by the detection circuit of the detection unit, and the buzzer continuously emits a beep based on the detection output of the detection circuit and the light emitting diode is turned on. By continuously lighting, the inspector recognizes that the AC circuit is in a high-voltage charging state.

[0005]

By the way, in the conventional voltage detector, by extending the insulating rod, the power supply of the detection circuit of the voltage detection section is automatically turned on, and after the voltage detection test is executed, it goes into a standby state. Since it can be used with the insulating rod extended during the voltage detection, it is possible for the inspector to work at a safe distance from the AC line when detecting the presence or absence of charging in the high-voltage AC line, It is very suitable because it can prevent the occurrence of electric shock accidents.

However, since the voltage detector is for high voltage only, which can detect the presence / absence of charging of only the high voltage AC circuit, it is different from the voltage detector for the low voltage AC circuit. That is, there is no choice but to use a voltage detector dedicated to low voltage or a voltage detector commonly used for high voltage and low voltage. In this way, when using the high-voltage dedicated and low-voltage dedicated voltage detectors according to their use, it is necessary to check beforehand whether the AC circuit is high voltage or low voltage before performing the voltage detection work. At the same time, it is extremely dangerous to mistakenly attempt to use a low voltage detector for a high voltage AC circuit.

On the other hand, in the conventional high-low voltage common voltage detector, the insulating rod extending from the voltage detecting portion is not expandable and contractable, but only a short grip portion is provided. When using such a voltage detector, there is no problem when performing voltage detection on a low-voltage AC circuit, but when attempting to perform voltage detection work on a high-voltage AC circuit, the distance from the AC circuit to the inspector is safe. Since the distance cannot be maintained, the inspector had to carry out the voltage detection work while holding the grip while holding the insulating gloves, which was very troublesome.

As described above, the voltage of the voltage detector is automatically turned on while the insulating rod is stretchable and the insulating rod is extended, and the voltage detector, which is in the standby state after executing the voltage detection test, has a high voltage. Since it is for exclusive use, its use range is very limited, so it was not practical. Further, in order to be able to use a low-voltage AC circuit in such a voltage detector, it is sufficient to incorporate various circuits for low-voltage detection in the detection circuit of the voltage detection unit. The current situation is that the circuit board to be incorporated in the above is very limited, and in this respect it was very difficult to incorporate various circuits for low voltage detection.

Therefore, the present invention has been proposed in view of the above problems, and an object thereof is to automatically turn on the power source of the detecting unit in a state where the insulating rod is extendable and the insulating rod is extended. It is an object of the present invention to provide a high- and low-voltage detector which can detect whether or not a high- and low-voltage AC circuit is charged with a simple circuit configuration in a voltage detector that is turned on and is in a standby state after executing a voltage detection test.

[0010]

A technical means for achieving the above object in the present invention is to have a detection metal fitting electrically connected to an AC electric circuit at the tip, and the AC electric circuit according to the input voltage of the detection metal fitting. With a built-in detection circuit for detecting the presence or absence of charging in, the detection unit provided with a notification means for notifying the charging state in the AC circuit by the detection output of the detection circuit,
It consists of a stretchable insulating rod extending from the base end of the voltage detector.
While holding the base end of the insulating rod and extending the insulating rod, the power of the voltage detecting unit is automatically turned on, and a self-diagnosis test is performed by self-diagnosing whether the detection circuit operates normally. In the voltage detector that goes into a standby state after performing the above, the detection circuit of the voltage detection unit includes a high voltage detection circuit and a low voltage detection circuit, and switching is performed according to the output level of the low voltage detection circuit. That is, the apparatus is provided with a single intermittent signal generating circuit which sends out intermittent signals having different duty ratios and oscillation frequencies depending on the state.

[0011]

In the high and low voltage detector according to the present invention, in addition to the high voltage detection circuit, the minimum necessary low voltage detection circuit is added, and
A single intermittent signal generating circuit is used to switch the output level of the low voltage detection circuit without providing a separate interrupt signal generating circuit for standby state, and the duty ratio and oscillation frequency are different between when the low voltage is detected and when in the standby state. By sending a signal, each intermittent signal for low voltage detection and standby state can be obtained, and with a simple circuit configuration, it is possible to realize a high and low voltage shared voltage detector that can be used for a low voltage AC circuit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high and low voltage detector according to the present invention will be described with reference to FIGS.

As shown in FIG. 3, the high and low voltage detector has a detecting portion (11) for detecting whether or not the alternating current circuit is charged, and a retractable insulating rod (extending from the base end of the detecting portion (11) ( 12) and a metal detection fitting (13) electrically connected to the detection section (11) is attached to the tip of the detection section (11). It is electrically coupled by being locked to. The detection section (11) has a detection fitting (13).
A detection circuit (14) electrically connected with the built-in detection means (15) including a light emitting diode, a lamp, etc.
The detection circuit (14) detects whether or not the AC electric circuit is charged by the input voltage of the detection metal fitting (13), and the detection output of the detection circuit (14) informs the charging state of the AC electric circuit ( Notify the inspector at 15). Also, insulating rods (12)
Is an expandable and contractible type with multiple connecting tubes (16) ...
A grip portion (17) made of a rubber material or the like is provided at the base end thereof. When using this high and low voltage detector, first, when the inspector extends the insulating rod (12) while holding the grip (17) at the base end of the insulating rod (12), the detector (11) In (), the power of the detection circuit (14) is automatically turned on, and a detection test is performed to determine whether or not the detection circuit (14) operates normally, and then a standby state is set. This voltage detection test tests whether the detection circuit (14) operates normally in the high voltage detection state. If it is normal, the buzzer, which is the notification means (15), sounds continuously. And the light emitting diode is continuously turned on. After this test, set the buzzer to "Pi, Pi,
The sound is briefly and intermittently emitted and the light emitting diode is blinked intermittently to make the inspector aware that it is in a usable state as a standby state. At this stage, the inspector locks the detection fitting (13) of the power detection section (11) on the AC circuit to be inspected.

The feature of the present invention is that the insulating rod (12) can be expanded and contracted, and the power of the electric detection section (11) is automatically turned on and the electric detection test is executed while the insulating rod (12) is extended. In addition to detecting whether or not the high-voltage AC circuit is charged in the voltage detector that goes into a standby state after that, it can be used to detect whether or not the low-voltage AC circuit is charged and is commonly used for high- and low-voltage AC circuits. I have made it possible.

As a concrete means thereof, in the present invention, the detection circuit (14) of the detection section (11) is constructed as shown in FIGS. 1 and 2. In the detection circuit (14) of the present invention, (1
8) is, for example, a low voltage detection circuit that outputs an output signal when a low voltage of 80 V or less is input, and (19) is, for example, 3
A high voltage detection circuit that outputs an output signal when a high voltage of 00 V or more is input, and the low voltage detection circuit (18) and the high voltage detection circuit (19) are commonly connected to the detection fitting (13). (20)
Is a power supply battery built in the power detection section (11), (21) is a switch that is mechanically turned on when the insulating rod (12) is extended,
(22) is a capacitor for a voltage detection test, which is connected to the power battery (20) through the switch (21), and is a low voltage detection circuit (1
8) and the input of the high voltage detection circuit (19). (2
3) is an intermittent signal generation circuit connected to the power supply battery (20) via the switch (21), which is also connected to the output of the low voltage detection circuit (18), as described later, during low voltage detection and standby state. Shared with. Reference numeral (24) is an oscillation circuit connected to the output of the intermittent signal generation circuit (23) and is also connected to the output of the high voltage detection circuit (19). Numerals (25) and (26) are a buzzer and a light emitting diode which are notifying means (15) (see FIG. 3) connected to the output of the oscillation circuit (24). Since the single intermittent signal generating circuit (23) described above is commonly used during low voltage detection and in the standby state, the intermittent signal generating circuit (23) is specifically configured as shown in FIG. That is, as shown in the figure, a diode (27) that switches a signal input during low-voltage detection and a standby state, and a resistor (28) with a small resistance value connected in series at both ends of the diode (27). (29), a high resistance resistor (3
0) and a resistor (28) (29) (30) and a capacitor (31) that determines the time constant.

When using the high and low voltage detector having the above-mentioned structure, first, the inspector holds the insulating rod (12) while holding the gripping part (17) at the base end of the insulating rod (12). Extend. Due to the extension of the insulating rod (12), the electric detection section (11)
Then, after the power source of the detection circuit (14) is automatically turned on and a detection test is performed to determine whether the detection circuit (14) operates normally, the standby state is entered.

That is, in the detection circuit (14), the switch (21)
Is mechanically turned on and the power source voltage of the power source battery (20) is applied to the capacitor (22), and the high voltage detection circuit (19) is prioritized and operated by the charging voltage of the capacitor (22).
The output of the high voltage detection circuit (19) causes the oscillation circuit (24) to operate, and the output of the oscillation circuit (24) causes the buzzer (2
5) Activate the light emitting diode (26). In this way, it is tested whether or not the detection circuit (14) normally operates in the high voltage detection state, and if it is normal, the buzzer (25) continuously emits a beep and the light emitting diode (26 )
Lights continuously.

After that, when the charged voltage of the capacitor (22) is discharged and becomes lower than the detection level of the high voltage detection circuit (19), the high voltage detection circuit (19) stops operating. On the other hand, since the power supply voltage is input to the intermittent signal generation circuit (23),
The intermittent voltage generating circuit (23) is activated by the power supply voltage,
The output activates the oscillator circuit (24), and the output activates the buzzer (25) and the light emitting diode (26). At this time, in the intermittent signal generation circuit (23), since the output of the low voltage detection circuit (18) is low level, the diode (27) is turned on and current flows through the resistors (28) and (29) having a small resistance value. The time constant determined by the resistance (28) (29) and the capacitor (31) is shortened, and the buzzer (25) is turned on.
Beep ”and the light emitting diode (26) blinks intermittently. This is set as a standby state to let the inspector recognize that it is in a usable state.

At this stage, as shown in FIG. 4, the inspector (m) locks the detection fitting (13) of the power detecting section (11) on the alternating current circuit (a) to be inspected. If the AC circuit (a) is in a high voltage charged state, the detection circuit (14) of the power detection section (11)
The high voltage detection circuit (19) operates to activate the oscillation circuit (24) by its output, and activates the buzzer (25) and the light emitting diode (26) by the output of the oscillation circuit (24). At this time, the buzzer (25) continuously emits a beep and the light emitting diode (26) lights continuously, so that the inspector (m) confirms that the alternating current circuit (a) is in a high voltage charging state. Recognize. Further, if the AC circuit (a) is in a low-voltage charging state, the detection circuit (14) detects
Is activated and its output is input to the intermittent signal generating circuit (23). In the intermittent signal generation circuit (23), unlike the case of the standby state described above, the output from the low voltage detection circuit (18) is at the high level, so that the diode (27) turns off.
A current flows through the resistor (28) having a small resistance value and the resistor (30) having a large resistance value after F, and the time constant determined by the resistors (28) (30) and the capacitor (31) becomes long. As described above, the intermittent signal generating circuit (23) can generate an intermittent signal having a different duty ratio and oscillation frequency when the low voltage detection is performed, unlike the standby state. As described above, the time constant becomes long and the buzzer (25 ) Is made to sound for a long time intermittently, and the light emitting diode (26) blinks intermittently. As a result, the inspector (m) has the AC circuit (a)
Recognize that the battery is in a low voltage charge state.

If the AC circuit (a) is in a non-charged state, both the low voltage detection circuit (18) and the high voltage detection circuit (19) will not operate and the standby state described above will continue.
The inspector (m) keeps sounding the buzzer (25) briefly and intermittently, and keeps the light emitting diode (26) blinking intermittently so that the AC circuit (a) is not charged. Recognize that you are in a state.

[0021]

EFFECTS OF THE INVENTION According to the high and low voltage detector of the present invention, an expandable insulating rod is provided, and the extension of the insulating rod automatically turns on the power of the detecting unit and executes the detection test. After that, in a standby state, it is possible to provide a voltage detector of high practical value which is commonly used for high voltage and low voltage and can perform low voltage detection in addition to high voltage detection with a simple circuit configuration. In this case, it is not necessary to confirm in advance whether the AC electric circuit has a high voltage or a low voltage, and in any case, the work can be performed with the distance from the AC electric circuit to the inspector kept at a safe distance.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a detection circuit of a high and low voltage detector according to the present invention.

FIG. 2 is a circuit diagram showing an intermittent signal generation circuit of the detection circuit of FIG.

FIG. 3 (a) is a front view showing a state in which the insulating rod of the high and low voltage detector of the present invention is extended, and FIG. 3 (b) is a side view showing a state in which the insulating rod of the high and low voltage detector of the present invention is contracted.

FIG. 4 is an explanatory view showing a usage state of the high and low voltage detector of the present invention.

[Explanation of symbols]

 11 Electric detection section 12 Insulation rod 13 Detection metal fitting 14 Detection circuit 15 Notification means 18 Low voltage detection circuit 19 High voltage detection circuit 23 Intermittent signal generation circuit a AC circuit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hiroshi Yamada 3-29-3 Obamacho, Amagasaki City, Hyogo Prefecture Hasegawa Denki Kogyo Co., Ltd. (56) Bibliography Sho 49-55075 (JP, U) Actual Open 59-104083 (JP, U) Actual 62-53369 (JP, U) Actual 54-15575 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A detection metal fitting that is electrically coupled to an AC electric circuit is provided at the tip, and a detection circuit that detects the presence or absence of charging in the AC electric circuit based on the input voltage of the detection metal fitting is built-in.
It consists of a detection unit provided with an informing means for informing the charging status of the AC circuit by the detection output of the detection circuit, and an expandable insulating rod extending from the base end of the detection unit. The power of the voltage detection part is automatically turned on with the insulating rod held and the insulation rod is extended, and after the self-diagnosis of whether the detection circuit operates normally and the voltage detection test is executed, the standby state is set. In the voltage detector, the detection circuit of the detection unit includes a high voltage detection circuit and a low voltage detection circuit, and switches according to the output level of the low voltage detection circuit,
A high / low voltage detector comprising a single intermittent signal generating circuit for transmitting intermittent signals having different duty ratios and oscillation frequencies when a low voltage is detected and in a standby state.