JP2010277725A

JP2010277725A - Power supply device

Info

Publication number: JP2010277725A
Application number: JP2009126884A
Authority: JP
Inventors: Yasunori Hamai; 保徳濱井; Tetsuo Furumoto; 哲男古本; Masao Imamoto; 正夫今本; Shigeru Aihara; 茂相原
Original assignee: Tempearl Industrial Co Ltd
Current assignee: Tempearl Industrial Co Ltd
Priority date: 2009-05-26
Filing date: 2009-05-26
Publication date: 2010-12-09
Anticipated expiration: 2029-05-26
Also published as: JP5295865B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device, simply, with high reliability and over a long period of time, making detection whether a power source line of a load is connected to the device with a function of not supplying a power source if power is restored while a power source switch of an electric apparatus or a load is turned on, in case power supply to an electric apparatus load is stopped due to generation of power failure or a plug falling off a socket. <P>SOLUTION: The power supply device supplies current to a detection means whether a power source line of a load is connected or not through a plug detection means for detecting that plug blades of the power source line of the load are plugged into blade rests of a multipolar plug-in connecting unit as a means of connecting the power source line of the load. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は，電動工具のような電気機械器具等の負荷に電源を供給するための装置であって，該負荷と電源の間に接続して用いる装置に関する。 The present invention relates to an apparatus for supplying power to a load such as an electric machine such as an electric tool, and relates to an apparatus used by being connected between the load and the power supply.

電動工具には，ドリルやグラインダー，ノコ，カンナなど電動で刃先が動くものが多く，刃先を安全カバーで覆うなど工具自体で安全性に配慮してある。しかし電動工具は可搬型である場合が多く，使用中に該電動工具の電源線が引っ張られるなどして電源プラグがコンセントから抜けてしまい動作が停止することや，電動工具の消費電流の関係で電源を供給する分電盤内の遮断器が動作することにより電源供給が止まり動作が停止することがある。その際は工具自体の電源スイッチを一旦切りにしたうえでコンセントに差しなおしたり遮断器を投入すれば問題ないが，あわてて電動工具の電源スイッチを入れたまま，コンセントにプラグを差しなおしたり，遮断器を投入してしまうことがある。 Many power tools, such as drills, grinders, saws, and cannas, move the blade tip electrically, and the tool itself takes safety into consideration, such as covering the blade tip with a safety cover. However, power tools are often portable, and the power plug of the power tool is pulled during use, etc., causing the power plug to come off the outlet and stop the operation. When the circuit breaker in the distribution board that supplies power operates, the power supply stops and the operation may stop. In that case, there is no problem if the power switch of the tool itself is turned off and then plugged in again or plugged in the circuit breaker. However, if the power switch of the power tool is turned on, reconnect the plug to the outlet. Breaker may be thrown in.

このような場合，作業者の注意は工具そのものから電源プラグや遮断器の操作に移っており，電源プラグを差しなおしたり，再度電源が供給されて再び電動工具が動き出したときの安全性には注意が払われておらず，いきなり工具が動き出して身体や器物が損傷する場合があって非常に危険である。 In such a case, the operator's attention has shifted from the tool itself to the operation of the power plug and circuit breaker, and there are safety concerns when the power tool is reconnected or when the power tool starts moving again when power is supplied again. Attention is not paid, and the tool suddenly starts moving and the body and equipment may be damaged.

このような危険性を回避するため，特許文献１のものが公知である。特許文献１に示す装置は，装置より電源側で停電となり復電した直後の所定時間内に電路の電流を検出した場合には電路を遮断するようにしたものである。しかしながら，特許文献１に示す装置は，装置より電源側が復電した直後の所定時間内に電路電流を検知した場合に電路を遮断するものであるから，装置より負荷側で電動工具と装置の電源接続が外れた場合は考慮されていない。より具体的には，特許文献１の装置はコードリールに組み込んで使用することを想定しているが，コードリールに設けられたコンセントと電動工具のプラグが外れた場合は考慮されていない。 In order to avoid such danger, the thing of patent document 1 is well-known. The device shown in Patent Document 1 is designed to cut off the electric circuit when a current in the electric circuit is detected within a predetermined time immediately after a power failure occurs on the power supply side of the device and power is restored. However, since the device shown in Patent Document 1 cuts off the electric circuit when a circuit current is detected within a predetermined time immediately after the power source side recovers from the device, the power tool and the power source of the device are more on the load side than the device. It is not considered when the connection is lost. More specifically, it is assumed that the device of Patent Document 1 is used by being incorporated in a cord reel, but this is not taken into account when the outlet provided on the cord reel and the plug of the electric tool are removed.

そこで，本願の出願人は特許文献２のような発明を行った。特許文献２は，電気機械器具等の負荷の電源線を接続して電源を供給するための装置であって，主回路の導体と，主回路を開閉する接点手段と，主回路を開閉する接点に対して並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷の電源線が接続されているかどうかの検出手段とを備え，前記電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置である。特許文献２によれば，装置より電源側で停電し，その後復電した場合のみならず，電動工具のプラグがコンセントから外れた場合も考慮されている。 Therefore, the applicant of the present application has invented an invention as described in Patent Document 2. Patent Document 2 is an apparatus for supplying power by connecting a power line of a load such as an electric machine instrument, and a conductor of a main circuit, contact means for opening / closing the main circuit, and a contact for opening / closing the main circuit. Means for supplying power to the load side via an impedance in parallel to the load, a means for detecting current flowing through the impedance, and a means for detecting whether the power line of the load is connected. An electric circuit comprising: a sequence for turning on a contact of the main circuit when the means does not detect current and the detection means for detecting whether or not the power line of the load is connected detects the connection. It is a power supply device such as a machine tool. According to Patent Document 2, consideration is given not only to a case where a power failure occurs on the power supply side of the apparatus and then power recovery, but also to a case where the plug of the electric power tool is disconnected from the outlet.

特許文献２における請求項２では，電気機械器具等の電源線を接続して電源を供給するための装置であって，主回路の導体と，主回路の導体の接続を開閉するａ接点を有する第一の継電器と，該第一の継電器のａ接点と並列的に駆動コイルを接続しｂ接点を有する第二の継電器と，負荷電源を接続するコンセントと，コンセントの受け刃とは別にプラグの刃に接触する接触子を備え，該接触子は第二の継電器のｂ接点の動作を介して第一の継電器の駆動コイルに駆動電圧を供給することを特徴とする電気機械器具等の電源供給装置を提供している。 Claim 2 in Patent Document 2 is an apparatus for supplying power by connecting a power line of an electric machine or the like, and has a main circuit conductor and a contact for opening and closing the connection of the main circuit conductor. The first relay, the second relay having the b contact connected in parallel with the contact a of the first relay, the outlet connected to the load power source, and the receiving blade of the outlet separately from the plug A power supply for an electric machine or the like characterized by comprising a contact that contacts the blade, the contact supplying a drive voltage to the drive coil of the first relay through the operation of the b contact of the second relay The device is provided.

また，特許文献２における請求項３では，電気機械器具等の電源線を接続して電源を供給するための装置であって，主回路の導体と，主回路の導体の接続を開閉するａ接点を有する継電器と，該継電器のａ接点と並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷電源を接続するコンセントと，コンセントの受け刃とは別にプラグの刃に接触する接触子を備え，該接触子がプラグの刃に接触し，前記電流の検出手段が電流を検出していないときに，前記継電器の駆動コイルに駆動電圧を供給するシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置を提供している。特許文献２における請求項２と請求項３の接触子は文献２の請求項１に示す，負荷の電源線が接続されているかどうかの検出手段と，同じく請求項１の電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを非常に簡単な構成で実現しているものである。 Further, in claim 3 of Patent Document 2, an apparatus for connecting a power line of an electric machine or the like to supply power, the contact of the main circuit conductor and the contact of the main circuit conductor being opened and closed A relay having a power supply to the load side through an impedance in parallel with the contact a of the relay, a means for detecting a current flowing through the impedance, an outlet for connecting the load power supply, and a receptacle for the outlet In addition, a contact that contacts the blade of the plug is provided, and when the contact contacts the blade of the plug and the current detection means does not detect the current, the drive voltage is supplied to the drive coil of the relay Provided is a power supply device for an electric machine or the like characterized by having a sequence. The contacts of claim 2 and claim 3 in Patent Document 2 are the detection means for determining whether the power line of the load is connected, as shown in Claim 1 of Reference 2, and the current detection means of Claim 1 is a current. The sequence for turning on the contact of the main circuit when the detecting means for detecting whether the load power line is connected or not is detected with a very simple configuration. is there.

特開２００６−１５６１０３JP 2006-156103 A 特願２００９−９７９２０Japanese Patent Application No. 2009-97920

しかしながら，前述の特許文献２の請求項２と請求項３では，その接触子がプラグの刃に接触する構造となっているため，現実的な差し込み接続器と接触子を構成するにあたり，その構造が複雑になりコストが高くなるおそれがあるという課題があった。また，プラグ刃や受け刃の使用は一般的に１０数年程度，またはそれ以上と，非常に長く用いられるものであり，長期間に亘る使用に伴い，接触部の酸化や汚れなどにより接触部の検出に係る信頼性が低下するおそれがあるという課題があった。 However, in claims 2 and 3 of the above-mentioned patent document 2, since the contact is in contact with the blade of the plug, the structure for constructing a realistic plug connector and contact is provided. There is a problem that there is a risk of increasing complexity and cost. In addition, the use of plug blades and receiving blades is generally very long, such as about 10 years or more. There is a problem that the reliability related to the detection of this may decrease.

図１は，一般的なＡＣ１００Ｖの差し込み接続器の構成事例である。図において１００１はコンセント側の絶縁筐体，１００２，１００３は刃受け，１００４と１００５は開口部であるが開口部の空間は狭小である場合が多い。２００１は対するプラグの絶縁筐体，２００２，２００３はプラグの刃である。このような構造の差し込み接続器において，前述の接触子はプラグの刃に接触することが必要であるから開口部１００４あるいは１００５に装備しなければならず，前述したような狭小の空間に部品を配置することは部品が小型化し，また，確実に接触を検知することは簡単ではない。 FIG. 1 shows a configuration example of a general AC 100V plug connector. In the figure, reference numeral 1001 is an insulating casing on the outlet side, 1002 and 1003 are blade supports, and 1004 and 1005 are openings, but the space of the openings is often narrow. Reference numeral 2001 denotes an insulating casing of the plug, and 2002 and 2003 denote plug blades. In the plug connector having such a structure, since the above-mentioned contact is required to come into contact with the blade of the plug, the opening 1004 or 1005 must be installed, and the parts are placed in the narrow space as described above. Arrangement makes the parts smaller, and it is not easy to detect contact reliably.

そこで本件発明は，電気機器負荷などへの電源供給が，停電の発生や，コンセントからプラグが抜けて停止した場合，電気機器や負荷などの電源スイッチが入ったままで再度復電した場合には，電源を供給しない機能を有する電源供給装置に，負荷の電源線が接続されているかどうかの検出を，簡単に長期間に亘り信頼性高く構成する電源供給装置を提供することを課題にしている。 Therefore, in the present invention, when power supply to an electric equipment load or the like is stopped when a power failure occurs, the plug is removed from the outlet, or the power supply is switched on again with the electric equipment or load being turned on, It is an object of the present invention to provide a power supply device that can easily detect whether a power supply line of a load is connected to a power supply device having a function of not supplying power, over a long period of time.

請求項１の発明は，電気機器の電源線を接続して電源を供給するための装置であって，主回路の導体と，主回路の導体の接続を開閉するａ接点を有する第一の継電器と，該第一の継電器のａ接点と並列的に駆動コイルを接続しｂ接点を有する第二の継電器と，電気機器の電源線を接続する多極の差込接続器と，該多極の差込接続器の刃受けに電気機器の電源線のプラグ刃が差し込まれたことを検出して出力信号を出力する非接触センサを刃受け近傍に設けるとともに該非接触センサの動作により前記刃受けと前記第二の継電器とを接続する接点部を備えてプラグ検出手段を構成し，該プラグ検出手段の動作により，第二の継電器のｂ接点の動作を介して第一の継電器の駆動コイルに駆動電圧を供給するようにしたことを特徴とする電源供給装置を提供したものである。 The invention according to claim 1 is a device for connecting a power line of an electric device to supply power, the first relay having a conductor of the main circuit and a contact for opening and closing the connection of the conductor of the main circuit A second relay having a b contact and a drive coil connected in parallel with the a contact of the first relay, a multipolar plug connector for connecting a power line of an electrical device, and the multipole A non-contact sensor for detecting that the plug blade of the power line of the electric device is inserted into the blade receiver of the plug connector and outputting an output signal is provided in the vicinity of the blade receiver, and the operation of the non-contact sensor The plug detecting means comprises a contact portion for connecting to the second relay, and is driven by the operation of the plug detecting means to the drive coil of the first relay through the operation of the b contact of the second relay. A power supply device characterized by supplying voltage Those that provided the.

請求項２の発明は，主回路の導体と，主回路を開閉する接点手段と，主回路を開閉する接点に対して並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷の電源線が接続されているかどうかの検出手段とを備え，前記電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置において，前記負荷の電源線が接続されているかどうかの検出手段は，負荷の電源線を接続する手段が多極の差し込み接続器であって，該差し込み接続器の刃受けに負荷の電源線のプラグ刃が差し込まれたことを検出する非接触センサと該非接触センサの動作により出力側が閉回路となる接点回路を備えたプラグ検出手段を刃受け近傍に設けて，負荷の電源線のプラグ刃が差込まれたときには，該プラグ検出手段を介して負荷の電源線が接続されているかどうかの検出手段に電流を供給するものであることを特徴として電源供給装置を提供したものである。 The invention of claim 2 is characterized in that a conductor of the main circuit, contact means for opening and closing the main circuit, means for supplying power to the load side via the impedance in parallel to the contact for opening and closing the main circuit, and through the impedance A means for detecting whether or not a load power line is connected, and a means for detecting whether or not the current detection means detects a current and the load power line is connected. In the power supply apparatus for an electric machine or the like, a sequence for turning on the contact of the main circuit when detecting a connection is detected. The means for connecting the power line of the load is a multi-pole plug connector, a non-contact sensor for detecting that the plug blade of the load power cable is inserted into the blade receptacle of the plug connector, and the means A plug detection means having a contact circuit whose output side is a closed circuit by the operation of the contact sensor is provided in the vicinity of the blade receiver, and when the plug blade of the power line of the load is inserted, the plug detection means is connected via the plug detection means. The present invention provides a power supply device characterized in that a current is supplied to detecting means for determining whether or not a power supply line is connected.

請求項３の発明は，主回路の導体と，主回路を開閉する接点手段と，主回路を開閉する接点に対して並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷の電源線が接続されているかどうかの検出手段とを備え，前記電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置において，前記負荷の電源線が接続されているかどうかの検出手段は，負荷の電源線を接続する手段が多極の差し込み接続器であって，該差し込み接続器の刃受けに負荷の電源線側のプラグ刃が差し込まれたことを検出して出力信号を出力する非接触センサを刃受け近傍に設けるとともに該非接触センサの動作により前記刃受けと前記第二の継電器とを接続する接点部を備えてプラグ検出手段を構成し，該プラグ検出手段の動作により，前記電流の検出手段が電流を検出したときＯＦＦとなるｂ接点の動作を介して主回路の接点の駆動装置に駆動電圧を供給するよう構成したものであることを特徴として電源供給装置を提供したものである。 According to a third aspect of the present invention, there is provided a conductor for the main circuit, contact means for opening / closing the main circuit, means for supplying power to the load side via the impedance in parallel with the contact for opening / closing the main circuit, and through the impedance A means for detecting whether or not a load power line is connected, and a means for detecting whether or not the current detection means detects a current and the load power line is connected. In the power supply apparatus for an electric machine or the like, a sequence for turning on the contact of the main circuit when detecting a connection is detected. The means for connecting the power line of the load is a multi-pole plug connector, and detects that the plug blade on the power line of the load is inserted into the blade receptacle of the plug connector and outputs an output signal. output A non-contact sensor is provided in the vicinity of the blade receiver and includes a contact portion for connecting the blade receiver and the second relay by the operation of the non-contact sensor. A power supply device is provided, characterized in that the drive voltage is supplied to the drive device of the contact of the main circuit through the operation of the b contact that is turned OFF when the current detection means detects the current. Is.

本件発明によれば，電気機器負荷などへの電源供給が，停電の発生や，コンセントからプラグが抜けて停止した場合，電気機器や負荷などの電源スイッチが入ったままで再度復電した場合には，電源を供給しない機能を有する電源供給装置に負荷の電源線が接続されているかどうかの検出手段を，簡単に長期に亘り信頼性高く構成した電源供給装置を提供できる。 According to the present invention, when the power supply to the electrical equipment load, etc. is stopped due to the occurrence of a power failure, the plug being removed from the outlet, or the power switch of the electrical equipment, the load, etc. being turned on again. Therefore, it is possible to provide a power supply apparatus in which the detection means for detecting whether or not the power line of the load is connected to the power supply apparatus having a function of not supplying power can be simply configured with high reliability over a long period of time.

一般的な差し込み接続器の説明図。Explanatory drawing of a general plug connector. 本件発明の第一の実施例の図。The figure of the 1st Example of this invention. 本件発明のプラグ検出手段と刃受けの関係の図（その１）。FIG. 2 is a diagram (part 1) illustrating a relationship between a plug detection unit and a blade receiver according to the present invention. 本件発明のプラグ検出手段と刃受けの関係の図（その２）。The figure of the relationship between the plug detection means of this invention, and a blade receiver (the 2). 本件発明の第二の実施例の図。The figure of the 2nd Example of this invention. 本件発明の第三の実施例の図。The figure of the 3rd Example of this invention.

次に本件発明を図面により詳細に説明する。図２は本件発明の第一の実施例の図である。図において１は商用電源，２は装置より電源側の電源接続手段，３は本件発明請求項１の電源供給装置，５は電動工具など電気機器である。電源接続手段２は例えばコンセントとプラグなどの差込接続器のようなものでもよく，ナイフスイッチや回路遮断器や電磁接触器のようなものでもよい。６，６’はコンセントの刃受けで図では２極の事例を示しているが，アース極付でもよく，アース極付の場合のアース極は図示していない。７，７’は電気機器５の電源電線のプラグの刃である。３０１は主回路接点で電磁コイル３０２が通電されたときに閉じるａ接点で，３０１と３０２で第一の継電器を構成する。３０４’は主接点３０１と並列に接続される電磁コイルでｂ接点３０５を駆動し，３０４’と３０５で第二の継電器を構成する。 Next, the present invention will be described in detail with reference to the drawings. FIG. 2 is a diagram of a first embodiment of the present invention. In the figure, 1 is a commercial power supply, 2 is a power supply means on the power supply side of the apparatus, 3 is a power supply apparatus according to claim 1 of the present invention, and 5 is an electric device such as an electric tool. The power connection means 2 may be a plug connector such as an outlet and a plug, or may be a knife switch, a circuit breaker, or an electromagnetic contactor. 6 and 6 'are examples of two-pole socket receptacles in the figure, but a ground electrode may be provided, and the earth electrode in the case of having a ground electrode is not shown. 7 and 7 ′ are plug blades of a power supply wire of the electric device 5. A main circuit contact 301 is a contact that is closed when the electromagnetic coil 302 is energized, and 301 and 302 constitute a first relay. 304 'is an electromagnetic coil connected in parallel with the main contact 301 to drive the b contact 305, and 304' and 305 constitute a second relay.

３０８は前記刃受けに電気機器の電源線のプラグ刃が差し込まれたことを検出するためのプラグ検出手段で，該プラグ検出手段３０８は，刃受けに電気機器の電源線のプラグ刃が差し込まれたことを検出して出力信号を出力する非接触センサ３０８１と，該非接触センサの動作により前記刃受けと前記第二の継電器とを接続する接点部３０８２を備えている。また，非接触センサ３０８１は，刃受け近傍に設けている。プラグ検出手段３０８が，刃受けに電気機器の電源線のプラグ刃が差し込まれたことを検出して動作したときには，ｂ接点３０５の動作を介して第一の継電器の駆動コイル３０２に電圧を供給する。 308 is a plug detecting means for detecting that the plug blade of the power line of the electric device is inserted into the blade holder, and the plug detecting means 308 includes the plug blade of the power line of the electric device inserted into the blade receiver. A non-contact sensor 3081 for detecting this and outputting an output signal, and a contact portion 3082 for connecting the blade receiver and the second relay by the operation of the non-contact sensor. The non-contact sensor 3081 is provided near the blade receiver. When the plug detecting means 308 operates by detecting that the plug blade of the power line of the electric device is inserted into the blade receiver, the voltage is supplied to the drive coil 302 of the first relay through the operation of the b contact 305. To do.

非接触センサ３０８１は，刃受けにプラグ刃が差込まれる位置の変化を検出するために，例えば，光の反射の変化を検出する光電型近接スイッチや光が遮られたことを検出するフォトインタラプタなどの光の変化を検出する光センサ，また，超音波型近接スイッチなどの音の伝達・反射の変化を検出する音センサ，磁界や電界の変化を検出する誘導型近接スイッチや磁気型近接スイッチ，静電容量型近接スイッチなどを用いるとよい。これらのセンサは一般的に入手可能であるので，簡単にコストをかけずに構成することが可能である。 The non-contact sensor 3081 is, for example, a photoelectric proximity switch that detects a change in reflection of light or a photo interrupter that detects that light is blocked in order to detect a change in the position where the plug blade is inserted into the blade receiver. Optical sensors that detect changes in light such as ultrasonic proximity switches, sound sensors that detect changes in sound transmission and reflection, such as ultrasonic proximity switches, inductive proximity switches and magnetic proximity switches that detect changes in magnetic and electric fields A capacitive proximity switch or the like may be used. Since these sensors are generally available, they can be easily configured without cost.

また，接点部３０８２は，前記非接触センサからの出力を受けて，接点部を入切するもので，メカニカルリレーや半導体リレーなどを用いて構成するとよい。 The contact portion 3082 receives an output from the non-contact sensor and turns the contact portion on and off, and may be configured using a mechanical relay, a semiconductor relay, or the like.

また，プラグ検出手段３０８が駆動するための電源は適宜電路から取得するとよい。 Further, the power source for driving the plug detecting means 308 may be appropriately acquired from the electric circuit.

ここで，刃受け６，６’を有するコンセントとプラグの刃７，７’とプラグ検出手段３０８の動作の関係について図３を用いて詳細に説明する。図においては，光センサを用いた例を示している。図３（ａ）は刃受け６，６’にプラグの刃７，７’が差し込まれていない場合を示しており，図３（ｂ）の図は差し込まれた場合を示している。図３（ａ）において，刃受け６，６’はプラグの刃７，７’の間に挟持されて適当な圧力をもって接触するよう刃受け６，６’のプラグの刃７，７’への接触部間の寸法ｗはプラグの刃７，７’間の寸法ｗ’よりやや大きく設定してあり，（ｂ）のように受け刃にプラグ刃が差し込まれた場合には６，６’の刃受けがｗとｗ’の差分の寸法の約１／２ずつ弾性的に内側に偏寄するよう構成されている。そしてプラグ検出手段３０８は，刃受けが内側に偏寄する直前に，差込まれるプラグにより，図中点線で示した投光部と受光部との間の光が遮断されたことを検出するように配されている。 Here, the relationship between the outlet having the blade receivers 6 and 6 ', the operation of the plug blades 7 and 7', and the plug detecting means 308 will be described in detail with reference to FIG. In the figure, an example using an optical sensor is shown. FIG. 3A shows a case where the plug blades 7 and 7 ′ are not inserted into the blade receivers 6 and 6 ′, and FIG. 3B shows a case where the plug blades 7 and 7 ′ are inserted. In FIG. 3 (a), the blade receivers 6 and 6 'are sandwiched between the plug blades 7 and 7' so that the blade receivers 6 and 6 'contact the plug blades 7 and 7' with an appropriate pressure. The dimension w between the contact portions is set to be slightly larger than the dimension w ′ between the plug blades 7 and 7 ′, and when the plug blade is inserted into the receiving blade as shown in FIG. The blade rest is configured to be elastically biased inward by about ½ of the difference between w and w ′. Then, the plug detecting means 308 detects that the light between the light projecting portion and the light receiving portion indicated by the dotted line in the figure is blocked by the plug inserted immediately before the blade receiver is biased inward. It is arranged in.

なお，刃受け６，６’が弾性的に外側に偏寄する構造にした場合には，外側に編寄する刃受けに接触するように接触子３０８を配して構成するとよい。また，このように刃受け自体が弾性的に編寄するほか，刃受けをばねやゴムなどの弾性体により，常には編寄しない方向に付勢させておき，プラグ刃が刃受けに差込まれたときに，前記弾性体が差込力に屈して，刃受けが機構的に編寄するよう構成してもよい。なお，ここでいう編寄とは，プラグを差込まないときの配置位置から，プラグを差込むことにより，刃受けが移動して配置位置が変わることを意味している。 In the case where the blade receivers 6 and 6 ′ are configured to be elastically biased outward, the contact 308 may be arranged so as to come into contact with the blade receiver that is knitted outward. In addition to elastically braiding the blade holder itself in this way, the blade holder is urged in a direction that does not always be braided by an elastic body such as a spring or rubber, so that the plug blade is inserted into the blade holder. When it is rare, the elastic body may bend by the insertion force and the blade support may be mechanically assembled. In addition, the arrangement | positioning here means that a blade holder moves and an arrangement position changes by inserting a plug from an arrangement position when a plug is not inserted.

図４は図３の別の実施例である。この実施例では，刃受け６，６’は，個々にプラグの刃７，７’を挟持するよう構成されており，（ａ）は刃受けにプラグが接続されていない状態の図，（ｂ）は刃受けにプラグが接続されている状態の図である。図３の刃受けはプラグ７，７’の内寸に沿って偏寄するが，図４の刃受け６，６’は夫々が，プラグ７，７’の厚みによって弾性的に偏寄する構成であり，接触子３０８は刃受け６’が偏寄する直前に，差込まれるプラグにより，図中点線で示した投光部と受光部との間の光が遮断されたことを検出するように配される。以上のようなプラグ検出手段３０８は，図１における狭小な開口部１００４や１００５に配置する必要はなく，刃受け６’の側方に配することができるから空間的に配置の自由度が高く，構成し易い。また，刃受けとの接触部分がないので，長期に亘る汚れなどによる接触不良が生じない。従って，簡単に現実的で長期に亘り検出の信頼性の高い構造が得られる。また，非接触センサと刃受けの位置関係は，プラグ刃が刃受けに当接する位置と，非接触センサがプラグ刃の差込を検出する位置を極力合わせて設けるとよい。 FIG. 4 shows another embodiment of FIG. In this embodiment, the blade receivers 6 and 6 'are configured to sandwich the blades 7 and 7' of the plugs individually, and (a) is a diagram showing a state in which no plug is connected to the blade receiver, (b ) Is a diagram of a state in which a plug is connected to the blade receiver. 3 is offset along the inner dimensions of the plugs 7 and 7 ′, but the blade holders 6 and 6 ′ in FIG. 4 are elastically offset depending on the thickness of the plugs 7 and 7 ′. The contact 308 detects that the light between the light projecting portion and the light receiving portion indicated by the dotted line in the drawing is blocked by the plug inserted immediately before the blade receiver 6 'is biased. Arranged. The plug detecting means 308 as described above does not need to be disposed in the narrow openings 1004 and 1005 in FIG. 1 and can be disposed on the side of the blade receiver 6 ′, so that the degree of freedom in spatial arrangement is high. Easy to configure. In addition, since there is no contact portion with the blade holder, there is no contact failure due to long-term contamination. Therefore, it is possible to obtain a structure that is simple and realistic and highly reliable for detection over a long period of time. In addition, the positional relationship between the non-contact sensor and the blade receiver may be set such that the position where the plug blade contacts the blade holder and the position where the non-contact sensor detects the insertion of the plug blade are matched as much as possible.

次に図２に示す実施例の動作について説明する。電源接続手段２が電源に接続されており，電気機器５のプラグ７，７’がコンセントの刃受け６，６’に差し込まれていないときは，‘プラグ検出手段３０８はプラグ刃を検出していないので，第一の継電器の駆動コイル３０２には電圧が供給されず，主接点３０１はＯＦＦのままである。次に電気機器５の電源スイッチ５０１がＯＦＦの状態でプラグ７，７’がコンセントの刃受け６，６’に差し込まれた場合，プラグ検出手段３０８はプラグ刃を検出して接点部３０８２を閉じるが，電源スイッチ５０１がＯＦＦであるので，第二の継電器の駆動コイル３０４’には電流が流れず，ｂ接点３０５は開かないので第一の継電器の駆動コイル３０２には電圧が供給されて主接点３０１がＯＮする。 Next, the operation of the embodiment shown in FIG. 2 will be described. When the power supply connecting means 2 is connected to the power source and the plugs 7 and 7 'of the electric device 5 are not inserted into the blade receptacles 6 and 6' of the outlet, the 'plug detecting means 308 detects the plug blade. Since no voltage is supplied to the drive coil 302 of the first relay, the main contact 301 remains OFF. Next, when the plugs 7 and 7 ′ are inserted into the blade receptacles 6 and 6 ′ of the electrical equipment 5 with the power switch 501 being OFF, the plug detection means 308 detects the plug blade and closes the contact portion 3082. However, since the power switch 501 is OFF, no current flows through the drive coil 304 ′ of the second relay, and the b contact 305 is not opened, so that a voltage is supplied to the drive coil 302 of the first relay and The contact 301 is turned on.

その後，電気機器の電源スイッチ５０１をＯＮすれば，電気機器の電流は主接点３０１を通じて流れるが，主接点３０１の接触抵抗より第二の継電器の駆動コイル３０４’のインピーダンスが格段に高いので電流は駆動コイル３０４’には流れず，主接点３０１はＯＮ状態を維持する。以降，電源スイッチ５０１をＯＮ，ＯＦＦしても状態は変らない。 Thereafter, when the power switch 501 of the electrical device is turned on, the current of the electrical device flows through the main contact 301. However, since the impedance of the drive coil 304 ′ of the second relay is much higher than the contact resistance of the main contact 301, the current is The main contact 301 remains in the ON state without flowing through the drive coil 304 ′. Thereafter, the state does not change even if the power switch 501 is turned ON / OFF.

次に，図２で，電気機器５の電源スイッチ５０１をＯＮにした状態でプラグ７，７’を刃受け６，６’に差した場合を説明する。この場合，‘プラグ検出手段３０８がプラグ刃が刃受けに差込まれたことを検出し，接点部３０８２を閉じて第一の継電器の駆動コイル３０２に電圧を供給しようとするが，主接点３０１が開いているのでプラグ７，７‘が刃受け６，６’に接触した瞬間に電気機器５の電流が第二の駆動コイル３０４’を流れ，ｂ接点３０５を開くので，第一の継電器の駆動コイル３０２には電圧が印加されず，主接点３０１がＯＮすることはない。 Next, a case where the plugs 7 and 7 'are inserted into the blade receivers 6 and 6' in a state where the power switch 501 of the electric device 5 is turned on will be described with reference to FIG. In this case, the plug detecting means 308 detects that the plug blade is inserted into the blade receiver, and closes the contact portion 3082 to supply a voltage to the drive coil 302 of the first relay. Is open, the current of the electric device 5 flows through the second drive coil 304 'and opens the b-contact 305 at the moment when the plug 7, 7' contacts the blade receiver 6, 6 '. No voltage is applied to the drive coil 302, and the main contact 301 is not turned ON.

電気機器５に駆動コイル３０４’を通じて流れる電流は，駆動コイル３０４’を介さない場合に比べ駆動コイル３０４’のインピーダンス分低減されており，第一の継電器の駆動コイル３０２の制御だけ行えばよいような小さな接点容量のものの場合インピーダンスは電気機器のインピーダンスに比べ非常に高いので，電気機器５は起動できない。ここで，プラグ７，７’はほぼ同時に刃受け６，６’に差し込まれた場合，プラグ検出手段３０８がプラグの差込を検出するよりも，電気機器５に電流が流れる方が先になるので，プラグ検出手段３０８がプラグの差込を検出するよりｂ接点３０５が開く方が早く，プラグ検出手段３０８がプラグの差込を検出しても第一の駆動コイル３０２には電圧は印加されない。また，接点の通電容量的にも第一の継電器は第二の継電器より大きく構成され，駆動コイルに同時に電圧が印加されても慣性的に主接点３０１が閉じるよりｂ接点３０５が開く方が早くなるよう構成されている。 The current flowing through the drive coil 304 ′ in the electrical device 5 is reduced by the impedance of the drive coil 304 ′ compared to the case where the drive coil 304 ′ is not passed, and only the control of the drive coil 302 of the first relay may be performed. In the case of a small contact capacity, the impedance is very high compared to the impedance of the electrical device, so that the electrical device 5 cannot be started. Here, when the plugs 7 and 7 ′ are inserted into the blade receivers 6 and 6 ′ almost simultaneously, it is earlier that the current flows through the electric device 5 than the plug detection means 308 detects the plug insertion. Therefore, the b contact 305 opens faster than the plug detection means 308 detects plug insertion, and no voltage is applied to the first drive coil 302 even if the plug detection means 308 detects plug insertion. . Also, the first relay is configured to be larger than the second relay in terms of the current carrying capacity of the contact, and even if the voltage is simultaneously applied to the drive coil, it is faster to open the b contact 305 than the main contact 301 is closed by inertia. It is comprised so that it may become.

電気機器５の電源スイッチ５０１をＯＮの状態でプラグ７，７’を刃受け６，６’に差し込んでしまい，電気機器５が起動できない状態になった場合，一旦電源スイッチ５０１をＯＦＦにすれば，第二の継電器の駆動コイル３０４’に電流が流れなくなり，ｂ接点３０５がＯＮに復帰し，その時点で駆動コイル３０２に電圧が供給されるので，主接点３０１がＯＮし，その状態から電気機器５の電源スイッチ５０１をＯＮすれば，電気機器５は正常に動作する。 If the power switch 501 of the electrical device 5 is turned on and the plugs 7 and 7 'are inserted into the blade receivers 6 and 6', and the electrical device 5 becomes unable to start, once the power switch 501 is turned off , The current stops flowing to the drive coil 304 ′ of the second relay, the b contact 305 is returned to the ON state, and the voltage is supplied to the drive coil 302 at that time. If the power switch 501 of the device 5 is turned on, the electric device 5 operates normally.

以上のように，主接点３０１を有する第一の継電器と，該第一の継電器の主接点３０１と並列的に駆動コイル３０４’を接続しｂ接点３０５を有する第二の継電器と，負荷電源を接続する刃受け６，６’による差込接続器を備え，該多極の差込接続器の刃受け６，６’に電気機器の電源線側の刃７，７’が差し込まれたことを検出するプラグ検出手段３０８を備え，該プラグ検出手段３０８は第二の継電器のｂ接点３０５の動作を介して第一の継電器の駆動コイル３０２に電圧を供給するよう構成したので，電源供給装置に負荷の電源線が接続されているかどうかの検出手段を非常に簡単で現実的に長期に亘り信頼性高く構成することができる。 As described above, the first relay having the main contact 301, the second relay having the b contact 305 connected to the drive coil 304 ′ in parallel with the main contact 301 of the first relay, and the load power source It is provided with a plug connector with blade receptacles 6 and 6 'to be connected, and that the blades 7 and 7' on the power supply line side of the electrical equipment are inserted into the blade receptacles 6 and 6 'of the multipolar plug connector. A plug detecting means 308 for detecting is provided, and the plug detecting means 308 is configured to supply a voltage to the drive coil 302 of the first relay through the operation of the b contact 305 of the second relay. The means for detecting whether the power line of the load is connected or not can be configured very easily and practically with high reliability over a long period of time.

次に第二の実施例について図５を用いて説明する。図５の実施例は，図２の実施例において，第二の継電器の駆動コイル３０４’の代わりに，インピーダンス３０３と電流検出手段３０４を配したこと，図２の実施例では，接触子３０８から直接にｂ接点３０５の動作を介して駆動コイル３０２に電圧を供給するように接続しているが，図５の第二の実施例では，接触子３０８と刃受け６間の電圧検出手段３０６を備え，プラグ検出手段３０８の動作により電路と電圧検出手段３０６とが接続され，電圧検出手段３０６が電路の間の電圧を検出すると，ａ接点３０７をＯＮするようにしている。ａ接点３０７はｂ接点３０５の動作を介して，駆動コイル３０２に電圧を供給するようにしている。ここでインピーダンス３０３は第二の継電器の駆動コイル３０４’のインピーダンスに相当し，電流検出手段３０４は，図示しないｂ接点３０５の駆動手段と合わせて，コイル３０４’に電流が流れてｂ接点３０５を駆動する場合に相当しているほか動作は図２の第一の実施例と同一である。なお，電圧検出手段３０６はプラグ検出手段３０８の動作により電路の間の電圧を検出するようにしているが，刃受け６側に３０８相当のプラグ検出手段を設け，電路の間の電圧を検出するようにしてもよい。 Next, a second embodiment will be described with reference to FIG. In the embodiment of FIG. 5, in the embodiment of FIG. 2, the impedance 303 and the current detection means 304 are arranged instead of the drive coil 304 ′ of the second relay. In the embodiment of FIG. In the second embodiment shown in FIG. 5, the voltage detecting means 306 between the contact 308 and the blade receiver 6 is connected to supply voltage to the drive coil 302 through the operation of the b contact 305 directly. The electric circuit and the voltage detection unit 306 are connected by the operation of the plug detection unit 308. When the voltage detection unit 306 detects the voltage between the electric circuits, the a contact 307 is turned on. The a contact 307 supplies a voltage to the drive coil 302 through the operation of the b contact 305. Here, the impedance 303 corresponds to the impedance of the drive coil 304 ′ of the second relay, and the current detection means 304, together with the drive means of the b contact 305 (not shown), causes a current to flow through the coil 304 ′ and the b contact 305. The operation other than that corresponding to the case of driving is the same as that of the first embodiment of FIG. The voltage detection means 306 detects the voltage between the electric circuits by the operation of the plug detection means 308. However, a plug detection means equivalent to 308 is provided on the blade receiver 6 side to detect the voltage between the electric circuits. You may do it.

図６は，第三の実施例を示す図である。第二の実施例との相違は，プラグ検出手段３０８からｂ接点３０５の動作を介して直接駆動コイル３０２に電圧を供給するようにしたことである。なお，第一から第三の実施例において，ｂ接点の位置は，駆動コイル３０２と刃受け６側の極間でも動作上差し支えない。 FIG. 6 is a diagram showing a third embodiment. The difference from the second embodiment is that the voltage is directly supplied to the drive coil 302 from the plug detection means 308 through the operation of the b contact 305. In the first to third embodiments, the position of the b contact may be operated even between the drive coil 302 and the pole on the blade receiver 6 side.

以上のような，電源供給装置は，負荷の電源線が接続されているかどうかの検出手段を非常に簡単で現実的に長期に亘り信頼性高く構成することができる。 In the power supply apparatus as described above, the means for detecting whether or not the power line of the load is connected can be configured very simply and practically with high reliability over a long period of time.

尚，本発明は，上記実施形態に限定されるものではなく，本発明の要旨を逸脱しない範囲で種々の変更が可能である。 Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

例えば，長期に亘る検出の信頼性をより向上させるために，プラグ刃の差込みに伴い，非接触センサの表面に付着した埃や汚れなどを取り除くことを目的として，ブラシ状のものや拭取りクロスなどの汚れ除去手段を非接触センサ近傍に備えて，常には非接触センサの動作を妨げないように一方向に弾性体により付勢させておき，プラグ刃の差込が行われるときに，前記汚れ除去手段を前記弾性体の付勢力に抗して押圧して，前記汚れ除去手段が非接触センサの表面をなでるように移動して，プラグ刃の抜き差しの際に，非接触センサの表面に付着した汚れなどを取り除くように構成してもよい。 For example, in order to further improve the reliability of detection over a long period of time, a brush-like object or wiping cloth is used to remove dust or dirt attached to the surface of the non-contact sensor as the plug blade is inserted. When the plug blade is inserted when the plug blade is inserted, the dirt removing means such as is provided in the vicinity of the non-contact sensor and is always urged by an elastic body so as not to disturb the operation of the non-contact sensor. The dirt removing means is pressed against the urging force of the elastic body and moved so that the dirt removing means strokes the surface of the non-contact sensor. You may comprise so that the adhering stain | pollution | contamination etc. may be removed.

本件発明は，電動工具など電気機械器具の電源プラグとそれを接続するコンセントの間にアダプターのような形で構成してよく，またコードリールなどにも内蔵可能である。さらに負荷としては電動工具以外に電熱器など，電源スイッチが入りのまま，電源側が停電した後に復電したり，一旦電源接続が外れて再接続された場合に，火災の危険性がある装置などにも適用可能である。 The present invention may be configured in the form of an adapter between a power plug of an electric machine such as an electric tool and an outlet to which the power plug is connected, and can also be incorporated in a cord reel or the like. In addition to power tools such as electric heaters, there is a risk of fire when the power switch is turned on and power is restored after a power failure on the power supply side, or once the power supply is disconnected and reconnected. It is also applicable to.

なお，本件の発明は，負荷と電源の間に接続して用いる装置の他，電源装置そのものに組み込んで構成したり，電柱や仮設盤などに設けられる電源取得用の電源ボックスに設けたり，コンセントボックス自体に設けて構成してよい。これにより，電源側が停電した後に復電したり，一旦電源接続が外れて再接続された場合に，工具などの負荷がいきなり動き出して身体や器物が損傷することを未然に防止できる機器をより広範囲に提供することができる。 The invention of the present invention is not limited to a device that is connected between a load and a power supply, but is also built into the power supply device itself, installed in a power supply box for power supply provided on a utility pole, temporary panel, etc. It may be provided in the box itself. As a result, a wider range of devices that can prevent the body and equipment from being damaged due to sudden movement of loads such as tools when the power supply side is restored after a power failure or when the power supply is disconnected and reconnected. Can be provided.

１・・・商用電源
２・・・本装置より電源側の接続
３・・・本装置
３０１・・・主回路のａ接点
３０２・・・電磁コイル
３０３・・・インピーダンス
３０４・・・電流検出装置
３０５・・・ｂ接点
３０６・・・負荷側の接続検出手段
３０７・・・ａ接点
３０８・・・プラグ検出手段
４・・・装置より負荷側の接続
５・・・負荷
５０１・・・電源スイッチ
６・・・コンセントの刃受け
７・・・プラグの刃

DESCRIPTION OF SYMBOLS 1 ... Commercial power supply 2 ... Connection on the power supply side from this apparatus 3 ... This apparatus 301 ... Main circuit a contact 302 ... Electromagnetic coil 303 ... Impedance 304 ... Current detection apparatus 305 ... b contact 306 ... load side connection detection means 307 ... a contact 308 ... plug detection means 4 ... load side connection from device 5 ... load 501 ... power switch 6 ... Blade receptacle 7 ... Plug blade

Claims

電気機器の電源線を接続して電源を供給するための装置であって，主回路の導体と，主回路の導体の接続を開閉するａ接点を有する第一の継電器と，該第一の継電器のａ接点と並列的に駆動コイルを接続しｂ接点を有する第二の継電器と，電気機器の電源線を接続する多極の差込接続器と，該多極の差込接続器の刃受けに電気機器の電源線のプラグ刃が差し込まれたことを検出して出力信号を出力する非接触センサを刃受け近傍に設けるとともに該非接触センサの動作により前記刃受けと前記第二の継電器とを接続する接点部を備えてプラグ検出手段を構成し，
該プラグ検出手段の動作により，
第二の継電器のｂ接点の動作を介して第一の継電器の駆動コイルに駆動電圧を供給するようにしたことを特徴とする電源供給装置。 A device for connecting a power line of an electrical device to supply power, the first relay having a conductor of the main circuit, and a contact for opening and closing the connection of the conductor of the main circuit, and the first relay A second relay having a b contact and a drive coil connected in parallel with the a contact, a multi-pole plug connector for connecting a power line of an electric device, and a blade holder for the multi-pole plug connector A non-contact sensor that detects that the plug blade of the power supply line of the electrical device is inserted and outputs an output signal is provided in the vicinity of the blade receiver, and the blade receiver and the second relay are connected by the operation of the non-contact sensor. A plug detection means is configured with a contact part to be connected,
By the operation of the plug detection means,
A power supply device characterized in that a drive voltage is supplied to a drive coil of a first relay through an operation of a b contact of a second relay.

主回路の導体と，主回路を開閉する接点手段と，主回路を開閉する接点に対して並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷の電源線が接続されているかどうかの検出手段とを備え，
前記電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置において，
前記負荷の電源線が接続されているかどうかの検出手段は，
負荷の電源線を接続する手段が多極の差し込み接続器であって，該差し込み接続器の刃受けに負荷の電源線のプラグ刃が差し込まれたことを検出する非接触センサと該非接触センサの動作により出力側が閉回路となる接点回路を備えたプラグ検出手段を刃受け近傍に設けて，
負荷の電源線のプラグ刃が差込まれたときには，該プラグ検出手段を介して負荷の電源線が接続されているかどうかの検出手段に
電流を供給するものであることを特徴とする電源供給装置。 A conductor of the main circuit, a contact means for opening and closing the main circuit, a means for supplying power to the load side via the impedance in parallel to the contact for opening and closing the main circuit, a means for detecting a current flowing through the impedance, Means for detecting whether the power line of the load is connected,
The current detection means does not detect a current, and has a sequence for turning on the contact of the main circuit when the detection means of whether or not the load power line is connected detects the connection. In a power supply device such as an electric machine or appliance
The means for detecting whether the power line of the load is connected,
The means for connecting the power line of the load is a multi-pole plug connector, a non-contact sensor for detecting that the plug blade of the load power line is inserted into the blade receptacle of the plug connector, and the non-contact sensor A plug detecting means provided with a contact circuit whose output side is closed by operation is provided near the blade receiver,
When a plug blade of a load power line is inserted, a current is supplied to the detecting means for determining whether or not the load power line is connected via the plug detecting means. .

主回路の導体と，主回路を開閉する接点手段と，主回路を開閉する接点に対して並列にインピーダンスを介して負荷側に電源を供給する手段と，該インピーダンスを通じて流れる電流の検出手段と，負荷の電源線が接続されているかどうかの検出手段とを備え，前記電流の検出手段が電流を検出せず，前記負荷の電源線が接続されているかどうかの検出手段が接続を検出しているときに主回路の接点を入にするシーケンスを備えていることを特徴とする電気機械器具等の電源供給装置において，
前記負荷の電源線が接続されているかどうかの検出手段は，
負荷の電源線を接続する手段が多極の差し込み接続器であって，該差し込み接続器の刃受けに負荷の電源線側のプラグ刃が差し込まれたことを検出して出力信号を出力する非接触センサを刃受け近傍に設けるとともに該非接触センサの動作により前記刃受けと前記第二の継電器とを接続する接点部を備えてプラグ検出手段を構成し，
該プラグ検出手段の動作により，前記電流の検出手段が電流を検出したときＯＦＦとなるｂ接点の動作を介して主回路の接点の駆動装置に駆動電圧を供給するよう構成したものであることを特徴とする電源供給装置。

A conductor of the main circuit, a contact means for opening and closing the main circuit, a means for supplying power to the load side via the impedance in parallel to the contact for opening and closing the main circuit, a means for detecting a current flowing through the impedance, Detecting means for detecting whether the power line of the load is connected, the current detecting means does not detect the current, and the detecting means for detecting whether the power line of the load is connected detects the connection In a power supply device for an electric machine or the like characterized by having a sequence for turning on a contact of the main circuit sometimes,
The means for detecting whether the power line of the load is connected,
The means for connecting the power line of the load is a multi-pole plug connector, which detects that the plug blade on the power line side of the load is inserted into the blade receptacle of the plug connector and outputs an output signal. A contact sensor is provided in the vicinity of the blade receiver and a contact detecting part for connecting the blade receiver and the second relay by the operation of the non-contact sensor is provided to constitute a plug detecting means,
The operation of the plug detection means is configured to supply a drive voltage to the drive device for the contact of the main circuit via the operation of the b contact which is OFF when the current detection means detects the current. A power supply device.