JP5508615B2 - Power supply equipment for electrical machinery and equipment - Google Patents

Description

The present invention relates to an apparatus for supplying power to an electric machine such as an electric tool, and relates to an apparatus used by being connected between a load and a power supply.

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 supply plug of the power tool is pulled during use, causing the power plug to come out of the outlet, and the operation stops. 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 still on, Breaker may be thrown in.

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.

In order to avoid such a danger, the thing like literature 1 is publicly known. The device shown in Document 1 is designed to cut off an electric circuit when a current in the electric circuit is detected within a predetermined time immediately after a power failure occurs on the power source side of the device and power is restored. However, since the apparatus shown in Patent Document 1 is designed to cut off the electric circuit when a circuit current is detected within a predetermined time immediately after the power supply side recovers from the apparatus, the electric tool and the apparatus are connected on the load side of the apparatus. It is not considered when the power supply is disconnected. More specifically, it is assumed that the apparatus of Document 1 is used by incorporating a cord reel, but this is not considered when the outlet of the cord reel and the plug of the electric tool are disconnected.

In addition, if the insulation of the power tool deteriorates, there is a risk of leakage, and using it as it is may cause the operator to get an electric shock. When a leakage occurs in an electric circuit, an electric accident is usually prevented by operating the leakage circuit breaker provided upstream of the outlet to which the electric tool is connected, but the leakage circuit breaker upstream of the circuit is activated. Therefore, the entire corresponding electric circuit will be interrupted. For this reason, unexpected troubles may occur due to the stoppage of power supply to the power tool during other work and the stoppage of power supply to the lighting.

JP 2006-156103 A

Therefore, the present invention is not limited to power recovery after a power failure on the power supply side of the device, but also when the power connection between the device and the power tool is disconnected once on the load side of the device and the connection is restored again. It is an object of the present invention to provide a power supply device such as an electric machine or the like that does not supply power when the power is inserted or when the insulation of the power tool is deteriorated to cause electric leakage.

Delete

[Claim 1] A device for supplying power by connecting a power source line of a load such as an electric machine, comprising a contact for opening and closing a main circuit, a tripping means for the contact, and a current detection for the main circuit Means, a power recovery detection means from a power failure, a power connection detection means for the device and the load, and a contact tripping determination means. The determination means starts from the detection of the power connection detection means, and the current detection means When the state is changed from the non-detection state to the current detection state, the contact is not tripped and energized. When the current is detected when the connection of the power connection detection means is detected, the contact is pulled out and energized by the trip means. The power recovery detecting means provides a power supply device for an electric machine or the like characterized by energizing the contact tripping means each time power recovery is detected.

According to claim 2, further determining a zero-phase current transformer for the main circuit is provided so transmural interpolation, whether leakage current in the main circuit in response to an output signal from the zero-phase current transformer is occurring The leakage trip judgment means outputs a drive signal to the contact tripping means when it is judged that a leakage current is generated in the main circuit, and pulls the contact. It provides a power supply device for electrical equipment and the like according to claim 1 Symbol mounting, characterized in that biasing removed.

According to the first and second aspects of the present invention, power is restored after a power failure occurs on the power supply side of the device, or power supply connection is reconnected after the power supply is disconnected once on the load side of the device. In this case, if the power switch of the electric machine / equipment that is the load is turned on, the main circuit circuit is cut off. Even if it is done, the load is not driven and it is safe. In addition, when the insulation of the power tool is deteriorated and a leakage occurs, the power supply device operates so as not to supply power, so that the load is not driven and it is safe.

The figure of the Example of Claim 1 of this invention. The figure of the detailed example of a power recovery detection means. The figure of the 1st detailed example of a connection detection means. The figure of the 2nd detailed example of a connection detection means. Timing chart of power recovery detection or connection detection and current detection. The figure of the Example of Claim 2 of this invention. The figure of the Example of Claim 3 of this invention.

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram of one embodiment. In the figure, 1 is a commercial power source, 2 is a power supply connection means on the power supply side of the apparatus, 3 is a power supply device according to claim 1 of the present invention, 4 is a power supply connection means on the load side of the apparatus, and 5 is an electric machine such as an electric tool. is there. The power connection means 2 and 4 may be, for example, plug connectors such as an outlet and a plug, or may be a knife switch, a circuit breaker, or an electromagnetic contactor. 301 is a contact of the main circuit that opens when the electromagnetic coil 302 is energized, or a contact that has a manual closing device such as a circuit breaker and is pulled off by the electromagnetic coil. Reference numeral 303 denotes a detection means for the current flowing in the main circuit, and reference numeral 304 denotes a recovery detection means between the lines, which is configured to generate an output when the state is shifted from a state where there is no voltage between the lines. Reference numeral 305 denotes connection detection means of the power supply connection means 4, and reference numeral 306 denotes determination means.

The above-mentioned determination means 306 works as follows. When the power recovery detection means 304 detects a transition from a state with no voltage to a certain state, or when the reconnection detection means 305 detects a transition from the disconnected state to the connection, the current detection is performed at the same time. When the means 303 detects a current, it operates to drive the electromagnetic coil 302 and pull the contact 301 off. The electromagnetic coil 302 is driven when the current detection means 303 detects no current when power recovery or connection of the power supply connection means is detected, or when the current detection state is shifted to the current detection state. Not to work.

In the apparatus shown in FIG. 1, the case where the connecting means 2 and 4 are electrically connected and the power switch 501 of the load 5 is turned off will be described first. In this case, since the power supply voltage continues to be supplied to the load 5 and the connection state of 4 does not change, there is no trigger from the power recovery detection means 304 and the connection detection means 305, and the determination means 306 does not function. The coil 302 is not driven and power is continuously supplied. When the power switch 501 of the load 5 is turned on from this state, the current detection unit 303 detects the current, but the power recovery detection unit 304 and the connection detection unit 305 continue to change the state, so that no trigger is generated. The electromagnetic coil 302 is not driven and a power supply voltage is supplied to the load 5.

Next, a case will be described in which the power connection means 2 is disconnected and the connection is restored while the power switch 501 is turned on. In this case, the same applies to the case where the commercial power source 1 is restored after a power failure. When the electrical connection of the power connection means 2 is disconnected, the power recovery detection means 304 and the determination means 306 are once reset because there is no power supply, but the contact 301 remains on. Thereafter, when the connection of 2 is restored, the power recovery detection means 304 detects the power recovery and the switch 501 is in the on state, so that the current detection means 303 outputs the current simultaneously with the power recovery detection of the power recovery detection means 304. Therefore, the determination means 306 drives the electromagnetic coil 302, pulls out the contact 301, and the power supply to the load 5 is stopped.

Thereafter, once the power switch 501 is turned off and the contact 301 is turned on, the power recovery detection means 304 detects the power recovery, and the determination means 306 determines the output of the current detection means 303, but this time the current detection means Since 303 does not detect current, the electromagnetic coil 302 is not driven and the contact 301 is not cut. Further, when the power switch 501 is turned on after that, since there is no current once, the determination means 306 does not drive the electromagnetic coil 302, the power supply is continued to be supplied to the load 5, and the load is activated.

The contact 301 is turned on by manually turning on the contact having a mechanical manual closing device, and if the contact 301 is by an electromagnetic relay using the b contact, the contact of the power supply connecting means 2 is once disconnected. Is configured to be reset upon entering, or a reset switch or the like is provided in the drive circuit of the electromagnetic coil.

Next, an operation when the connection of the connecting means 4 is once disconnected and reconnected while the power switch 501 is turned on will be described. When the connection of the connection means 4 is disconnected and then reconnected, the connection detection means 305 detects the connection and the determination means 306 determines the current by the current detection means 303, but the power switch 501 is on. The current starts to flow simultaneously with the reconnection, and the current detection means 303 detects the current. Therefore, the electromagnetic coil 302 is driven, the contact 301 is pulled off, and the power supply to the load 5 is stopped. After that, when the power switch 501 is turned off once and the contact 301 is turned on again, the power recovery detection means 304 is triggered by the determination at the time of power recovery by the determination means 306, but the current detection means 303 does not detect the current, so the electromagnetic The coil 302 is not driven and power supply to the load 5 is continued, and then the load 5 is activated by turning on the power switch 501. At that time, since the power recovery detection means 304 and the connection detection means 305 are not triggered, the contact 301 is not pulled off.

Next, details of the power recovery detection unit 304 and the connection detection unit 305 will be described. FIG. 2 shows an embodiment of power recovery detection means. In FIG. 2A, 3041 is a rectifying element, 3042 and 3043 are resistors, 3044 is a capacitor, and 3045 is a power recovery determination means. (B) is a waveform showing the voltage across the capacitor 3044. The circuit of FIG. 3A operates as follows. In the state where the power source is connected, the capacitor 3044 is charged with the voltage rectified by the rectifying element 3041 and the voltage divided by the resistors 3042 and 3043 (the voltage level (A) in FIG. 3B). Yes. Here, when a power failure occurs on the power supply side from the power recovery detection means, the charge charged in the capacitor 3044 is discharged through the resistor 3043, and the voltage decreases as shown in (c) of (b). It becomes zero like. Next, when the power is restored, the battery is charged as shown in (d), but the power recovery judging means 3045 generates an output when the rising voltage up to the level of (e) in (b) is detected.

Alternatively, in FIG. 1, the determination unit 306 itself may be activated at the time of power recovery, and the output of the current detection unit 303 may be confirmed at the time of activation.

Next, details of the connection detection unit 305 will be described. 3 and 4 are detailed examples of the connection detecting means, respectively. In FIG. 3, 6 and 6 'are receptacle blades provided on the apparatus side, and 7 and 7' are blades of the load side plug. Reference numeral 3051 denotes a contact that contacts the plug blades 7 and 7 ′ separately from the receiving blades 6 and 6 ′. The connection detection circuit 3052 determines that a voltage is applied between the plug blades 7 and 7 ′. Yes.

FIG. 4 is an example of another connection detection means. In the figure, 6 and 6 'are outlet receptacle blades, 7 and 7' are plug blades, 601 is an outlet-facing surface of the outlet, and 701 is an outlet-facing surface of the plug. Reference numeral 3053 denotes an interlocking bar for the contact point 305, which is installed on the plug facing surface of the outlet. Closed configuration. The determination means 305 that the contact 305 is closed serves as a trigger to confirm whether the current detection means 303 has a current.

As another example of the connection detection means 305, in addition to the structure in which the connection detection circuit 3052 determines the connection between the outlet and the plug mechanically, the position is detected by a sensor that outputs an electric signal, and the presence or absence of the signal is determined. When the connection detection circuit 3052 determines that a light sensor and a light receiver are opposed to each other as a pair, and the plug blade blocks light emitted from the light emitter, the light receiver cannot receive light. The connection detection circuit 3052 connected to the sensor may make a determination.

Also, the light emitting part and the light receiving part are always arranged so that the light from the light emitting part cannot enter the light receiving part, and when the plug is inserted, the light from the light emitting part is reflected by the plug blade and received. The connection detection circuit 3052 that is incident on the unit and connected to the sensor may determine the structure. In this case, since it is not necessary to make the light emitting unit and the light receiving unit face each other, the installation space for the optical sensor can be reduced and space saving can be achieved.

As an embodiment of the power supply device, a case housed in a wall, a power line lead-in hole provided in the case, a mounting frame attached to one side of the case outside the wall, and a power source from the power line lead-in hole You may comprise this power supply apparatus in the embedded outlet provided with the terminal block which draws in a wire | line, the outlet connecting a load power supply, and the decorative cover which covers the front surface of an attachment frame except this outlet.

In this case, the power connection means on the power supply side of the power supply apparatus is constituted by a terminal block, and a power line from a branch breaker routed in the wall is connected to the terminal block. The load-side power connection terminal is composed of a blade receiver that connects the blade of the load power supply plug.

FIG. 5 is a timing chart for explaining the determination of the determination means 306 in the state of the outputs of the power recovery detection means 304 and the connection detection means 305 and the output of the current detection means 303, and the respective methods (a) and (b). There is. In each of the methods (a) and (b), (a) is the detection output of power recovery or connection, and (b) is the output of the current detection means.

The method (a) is a method for determining whether or not the current detection output (b) is present at the rise of the detection output (b). If the output (b) is present at the rise of (b) as in A, The electromagnetic coil 302 is driven. However, as in B, there is no output (b) at the rise of (a), and the electromagnetic coil 302 is not driven even if the current detection output rises thereafter. In this method, the detection output (A) may continue for an arbitrary time from the rising edge of detection, and after that, the output may disappear, or even if the output continues until a power failure or disconnection of 4 occurs. Good. In this case, it is necessary to configure the circuit at a timing such that the detection output on the (b) side rises slightly later than the detection output on the (b) side.

The method (b) is a method for determining whether or not the detection output (b) is present during an arbitrary fixed time t after the detection output (b) rises. If it occurs within the time t, the electromagnetic coil 302 is driven. If the detection output (b) rises behind the time t as shown in B, the electromagnetic coil 302 is not driven. In this case, the rising signal of the detection device (A) is generated only after the time t after detection, and the determination means 306 determines whether or not there is a detection output (B) while the output (B) is present. Alternatively, the output signal of the detection device of (a) is output only during a certain time t after the occurrence of the output of (b) so that the output signal of the detection device of (b) continues until a power failure or disconnection of 4 occurs. You may make it determine whether there exists.

FIG. 6 shows another embodiment. In the figure, the reference numerals are changed only in the functions different from those in FIG. 1, which is the power recovery detecting means 307. In the embodiment of FIG. 8, the power recovery detection means 307 drives the electromagnetic coil 302 so that the contact 301 is opened regardless of the output of the current detection means 303 every time power recovery from a power failure is detected. It is that you are. The tripped contact 301 can be closed only by manual reset means (not shown). In this case, when the closing operation of the contact 301 is not performed by a mechanical manual closing device but by a b contact electromagnetic relay, the opening of the contact 301 to the electromagnetic coil 302 of the double current detecting means 307 is controlled by an electronic device such as a reset button. Anything that can be solved by a circuit method may be used.

FIG. 7 shows an embodiment in which a leakage detection means for detecting a leakage current in the main circuit and a leakage trip determination means are provided. In the figure, the reference numerals are changed only where the functions are different from those in FIG. 1, which are the zero-phase current transformer 401 serving as a leakage detecting means and the leakage trip determining means 400. In the embodiment of FIG. 7, a zero-phase current transformer 401 is provided so as to penetrate the main circuit, and the zero-phase current transformer 401 and the leakage trip determination means 400 are electrically connected to each other, The output signal from the device 401 is input to the leakage trip determination means 400.

In addition, the leakage trip determination unit 400 and the electromagnetic coil 302 are electrically connected, and when the leakage trip determination unit determines that a leakage current is generated in the main circuit, a drive signal is sent to the electromagnetic coil 302. The electromagnetic coil 302 is driven so that the contact 301 is opened.

Therefore, as described above, the electromagnetic coil 302 is connected when the power recovery detection means 304 detects a transition from a state without voltage to a certain state or when the reconnection detection means 305 is disconnected from the connection means 4. When the current detection means 303 detects the current at the same time, and when the current detection means 303 detects the current, the main circuit is leaked, and the leakage trip determination means determines that the leakage is occurring To drive. For this reason, even if an individual electromagnetic coil is not provided for each factor for driving the electromagnetic coil 302, only the determination means can be provided individually and the electromagnetic coil can be shared. This has the secondary effect of reducing the size of the power supply device.

The power supply device as described above is used when the power switch of an electric machine such as an electric tool is turned on, when the power supply is disconnected after the power supply is disconnected on the power supply side of the device, or when the power supply is connected on the load side of the device. Even when the connection is disconnected and then reconnected, the main circuit contact is disconnected, so the electric machine and the like do not start up, and the electric machine does not start up unexpectedly. In addition, when the insulation of the power tool is deteriorated and a leakage occurs, the power supply device operates so as not to supply power, so that the load is not driven and it is safe.

The present invention may be commercialized in the form of an adapter between a power plug of an electric machine such as an electric tool and an outlet connecting the power plug, and can be built into a cord reel or the like. Furthermore, as a load, it can be applied to a device such as an electric heater other than an electric tool, which has a risk of fire when the power supply is disconnected and reconnected with the power switch turned on.

The invention of the present invention is not limited to a device connected between a load and a power supply, but also a configuration incorporated in the power supply device itself, an application to a wiring device such as a power plug in an extension cord, a utility pole, a temporary panel, etc. It may be provided in a power supply box for obtaining power or provided in the outlet 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. In addition, a power plug provided in an electric tool that is an electrical machine tool, or a plug that is built in the electric tool body and that is turned on even when power is supplied to the electric tool from a general outlet. The power tool itself may be provided with a function that prevents power from being inadvertently supplied when plugged in or when power is restored after a power failure.

DESCRIPTION OF SYMBOLS 1 ... Commercial power supply 2 ... Connection on the power supply side from this apparatus 3 ... This apparatus 301 ... Main circuit contact 302 ... Electromagnetic coil 303 ... Current detection means 304 ... Power recovery detection Means 305 ... Load side connection detection means 306 ... Determination means 307 ... Power recovery detection means 4 ... Load side connection from the device 5 ... Load 501 ... Power switch 6 ... Outlet blade 7 ... Plug blade

Claims (2)

A device for connecting a power line of a load such as an electric machine or the like to supply power, a contact for opening and closing the main circuit, a tripping means for the contact, a current detection means for the main circuit, and a power failure Power recovery detection means, device and load power connection detection means, and contact tripping judgment means. The contact trip judgment means detects the current from the detection of the power connection detection means. When the current state is detected, the contact is not pulled out and energized. When the current is detected when the power connection detection means is detected, the contact is pulled out and energized by the trip means. The power supply device for an electric machine or the like, characterized in that the electric power detection means urges the contact tripping means every time power recovery is detected. Further, a zero-phase current transformer provided to penetrate the main circuit, and a leakage trip judgment for judging whether or not a leakage current is generated in the main circuit in response to an output signal from the zero-phase current transformer Means for detecting leakage current, when the leakage current is determined to occur in the main circuit, outputs a drive signal to the contact release means, and trips and activates the contact. power supply device for electrical equipment and the like according to claim 1 Symbol mounting characterized.

Images