KR19980019228A - DETECTOR OF CURRENT AND ELECTRO-MAGNETIC WAVE - Google Patents

Abstract

The present invention relates to a current and electromagnetic wave detector capable of non-contact inspection of the current flowing through the wire and the electromagnetic waves generated from various electronic products.

The current and electromagnetic wave detector of the present invention is connected to an electromagnetic wave detector 3, a rectifier 5 for rectifying the electromagnetic wave detected by the electromagnetic wave detector, an amplifier 7 for amplifying the output of the rectifier, and the amplifier And display means 9 for displaying whether electromagnetic waves are detected outside.

According to the current and the electromagnetic wave detector of the present invention, it is possible to detect both the activation of the commercial voltage wire and the electromagnetic wave of the electronic product in a non-contact manner, and easy to manufacture by producing a very simple structure with a minimum number of parts used In addition, the manufacturing cost is not only low, but also significantly reduced in size, thereby making it easier for a worker to carry.

Description

Current and Electromagnetic Detectors

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current and electromagnetic wave detector, and more particularly, to a current and electromagnetic wave detector capable of non-contact inspection of electric current flowing in a wire and electromagnetic waves generated in various electronic products.

When working close to a high-voltage line to install a new cable or repair electrical equipment, the work is usually done with the power off, but the power is not cut off due to operator's carelessness or mutual error. Accidents that result in loss of life or injuries due to electric shock on high-voltage lines have not been initiated without work. In order to prevent such a safety accident, a current detector that can be easily carried by the site worker to send an alarm when a current flows on the track is required.

In addition, as a number of questions about the harmfulness of electromagnetic waves have followed, the general consumer has become interested in the electromagnetic wave generation of his or her own electronic products, and it is possible to detect and prevent consumers from being exposed to excessive electromagnetic waves. Necessity is emerging.

4 (A) shows a portable live safety alarm (first known example) used to detect a conventional current, which is attached to an operator's work cap by an elastic band and forms a dielectric in a band shape. It adopts a configuration that emits an alarm by judging whether liveliness is induced by electromotive force induced here. However, in the case of the first known example of such a configuration, there is a problem that can be used only for live inspection because it cannot detect electromagnetic waves of high frequency. In addition, when checking whether the wire of AC 6600V flows by using the device of the first known example, it can be detected at a distance of about 80Cm, and in the case of AC 22.9Kv, it can be detected at a distance of about 110Cm. In the commercial voltage, that is, AC 110V or 220V, there is a problem that can detect the current flowing only in contact with the wire.

4 (B) shows another well-known multifunctional live alarm detector (second known example), which is portable and has a clip attached to the back so as to be worn on a belt. The apparatus of the second known example includes functions such as simple current detection, detection of disconnection of a cord, determination of polarity and abnormality of light emitting diodes, diodes, and transistors. However, the second known example also has a disadvantage in that a device must be brought into contact with a wire when sensing current, and does not have a function for detecting electromagnetic waves. In addition, since it includes the function of a simple tester, the manufacturing cost of the product is high, and the size is also about 190 × 63 × 28mm, which is inconvenient to carry at all times.

In addition, various live detectors or electromagnetic wave detectors are used, but all of these conventional devices are capable of performing only one of a wire or an electromagnetic wave detection function, and there is no device capable of satisfying both functions simultaneously. A device that performs a single function also has a disadvantage in that the manufacturing cost is higher than that of the function.

The present invention has been made to solve the problems of the conventional apparatus as described above, an object of the present invention is to provide a current and electromagnetic wave detector that can detect both the electromagnetic wave of the electronic product and whether the activation of the wire of the commercial voltage in a non-contact type will be.

Another object of the present invention is to produce a very simple structure with a minimum number of parts to be used, making it easy to manufacture and inexpensive to manufacture, as well as a small current and electromagnetic detector that is easy to carry by the operator by significantly smaller size. To provide.

Figure 1 is a perspective view showing the appearance of the current and electromagnetic wave detector of the present invention

Figure 2 is a block diagram of the internal circuit of the current and electromagnetic wave detector of the present invention

Figure 3 is a detailed circuit diagram of the current and electromagnetic wave detector of the present invention

4 (a) and 4 (b) are perspective views showing the appearance of a conventional current sensor.

In order to achieve the above object, the current and electromagnetic wave detector of the present invention, the electromagnetic wave detection unit; A rectifier for rectifying the electromagnetic wave detected by the electromagnetic wave detector; An amplifier for amplifying the output of the rectifier; It is configured to include a display means connected to the amplification unit for indicating whether the electromagnetic wave is detected outside.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the current and electromagnetic wave detector of the present invention.

Figure 1 is a perspective view showing the appearance of the current and electromagnetic wave detector of the present invention, Figure 2 is a block diagram of the internal circuit of the current and electromagnetic wave detector of the present invention, Figure 3 is a detailed internal circuit diagram of the current and electromagnetic wave detector of the present invention As shown, the current and electromagnetic wave detector of the present invention includes an electromagnetic wave detector 3, a rectifier 5, two amplifiers 7, and a display means 9.

The electromagnetic wave detector 3 may adopt various components capable of detecting electromagnetic waves, such as a magnetic sensor or an antenna that detects a magnetic field. The intensity of the magnetic field at a distance of 1 m when a current of 10 A flows through the wire

B = μ _{0 at} A / 2πr

B = 4π × 10 ^-7 × 10 / 2π

= 2 × 10 ⁻⁶ [T] = 20 [mG].

However, the magnetic field range that can be detected by the Hall IC is 50-300 Gauss and the magnetic field that the Hall element can detect is about 1 kG, and the electromagnetic wave detector of this embodiment is about 20 mG. The magnetic field cannot be detected, and therefore, the magnetic field sensor as the electromagnetic wave detection unit of this embodiment is not preferable.

Therefore, in the present embodiment, it is preferable to configure the electromagnetic wave detector using an antenna made of a material such as Cu, Al, or the like, and a coil can be used.

The rectifier 5 is composed of two diodes 21 and 23, and C1 and R1, and is connected to the electromagnetic wave detector 3 to rectify the electromagnetic wave detected by the electromagnetic wave detector. In the present embodiment, C1 and R1 are used in a capacity of 22 x 10 ² pF and 1 MΩ, respectively.

The amplifier 7 is composed of two amplifiers in this embodiment, and each amplifier is composed of an OP Amp 25, an R2, an R3 or an OP Amp 27, an R4, an R5. R2, R3, R4 and R5 are 100KΩ, 1.2KΩ, 470KΩ and 1.2KΩ, respectively. The output terminal of the rectifier 5 is connected to the positive (+) input part of the OP Amp (25) (27) to amplify the output of the rectifier. The amplifier has two 3V special batteries (mercury battery) for driving the amplification circuit. (Not shown) is used.

The output means of each amplifier is connected to the display means 9 that can indicate whether the electromagnetic wave is detected outside, the display means is a red light emitting diode 29, buzzer 33, R6, R7 or green light emitting diode 31 , Including R8. Here, R6, R7, and R8 adopt resistors having capacities of 10Ω, 1Ω, and 10Ω, respectively.

As shown in Fig. 1, the current and electromagnetic wave detector of the present invention is covered with a casing which can promote consumer's desire to buy by various designs, and a clip is provided on the back of the casing for convenience of portability. The casing is made of light alloy or plastic such as aluminum that does not shield the magnetic field.

Referring to the operation relationship between the current and the electromagnetic wave detector of the present invention having the above configuration, when the electromagnetic wave is detected by the electromagnetic wave detector (3) by bringing the current and electromagnetic wave detector of the present invention in close proximity to the wire or electromagnetic air flow, the electromagnetic wave is a rectifier ( 5), rectified and amplified via the amplifier 7 and the amplified output is input to each display means 9. At this time, if the input value is less than the predetermined value, the green light emitting diode 31 emits light to inform the user that the electromagnetic wave is detected. If the input value is more than the set value, the red light emitting diode 29 emits light and the buzzer 33 It will ring and send a warning to the user.

According to the current and electromagnetic wave detector of the present invention having the above-described configuration, the following effects can be obtained.

1. Miniaturization of the product

Since the required number of components is minimized, the current and electromagnetic wave detector of the present invention can be made smaller than the current pager. Furthermore, by adopting components that minimize the number of components required and at the same time reduce the power consumption, the battery life is extended and manufacturing costs are lowered.

2. Whether to use commercial power and electromagnetic wave detection

① Live alarm

When the operator needs to check whether the power is on or off and perform the work, the current and electromagnetic wave detector of the present invention detects the low frequency electromagnetic wave coming from the power line without directly contacting the wire or using any other special instrument. You can easily check whether the current is flowing.

② Detection of electromagnetic waves of computer monitors and various electronic products

Under the situation where many questions about the harmfulness of electromagnetic waves are being made, it is easy to find out whether consumers are exposed to excessive electromagnetic waves. In particular, as the use of mobile phones constantly carried by the body increases rapidly, the current and electromagnetic wave detectors of the present invention can detect the electromagnetic waves in the ultra-high frequency range, which is the radio wave area of the wireless communication device, thereby warning the consumer of the excessive exposure level of the electromagnetic waves. Will be.

Claims (1)

An electromagnetic wave detecting unit, a rectifying unit for rectifying the electromagnetic wave detected by the electromagnetic wave detecting unit, an amplifying unit for amplifying the output of the rectifying unit, and display means connected to the amplifying unit to display whether the electromagnetic wave is detected externally. Current and electromagnetic wave detector.