JP2016002629A - Power source system of power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power source system of a power tool capable of eliminating the problem as the power source system to a conventional power tool, by forming an installation of a power source composed of a capacitor to a gripping case of a power tool body as constitution arrangement such as becoming a minimum form and weight, by constituting for directly connecting a power source cord to a driving control circuit of the power tool to the gripping case of the power tool body.SOLUTION: A power source system is provided with a small capacity capacitor 15 to a driving control circuit 14 of a power tool in a range of not respectively exerting influence on its form and weight to a gripping case of a power tool 10 body, and comprises a charging control device 30 having a transformer 32 and a rectification circuit for charging the small capacity capacitor and having a control circuit 34 provided with a large capacity capacitor 33 for controlling charge-discharge of the small capacity capacitor.

Description

  The present invention directly connects or incorporates a battery pack that uses a secondary battery or a power pack in which a plurality of capacitors are combined as a power supply device for driving means such as an electric motor that drives an electric tool, to a gripping case of the electric tool. Without the need to improve the operability of the power tool by arranging the capacitor so that the power supply is the capacitor for the gripping case of the power tool body, with a configuration and configuration that has a minimum form and weight. It is related with the power supply system which can do.

  Conventionally, for example, in a cordless power tool, a battery pack made of a secondary battery such as a nickel-cadmium battery or a nickel-hydrogen battery is used as a power source of a built-in motor, and such a battery pack is used as a cordless power tool body. It is configured to be detachably mounted. And when this secondary battery is exhausted, remove the battery pack from the cordless power tool body directly or connect to the dedicated battery charger and use it repeatedly. Is common.

  However, in recent years, in this type of cordless power tool, needs for power-up such as improvement of work speed and work amount increase by one charge have increased, and the battery has inevitably become larger. For this reason, the total weight of an electric tool becomes heavy, and when an operator works with one hand, the problem that operativity worsens arises.

  Therefore, a technique has been proposed that allows the user of the power tool to use the power tool main body and the battery (battery) separately so that the weight felt during use can be reduced. Yes. For example, a battery holster (portable power source) capable of holding and connecting a battery corresponding to the battery insertion port provided in the main body of the electric tool is provided, and the battery holster is inserted into the battery holster via an electric cord. An adapter that can be connected to the opening is provided, and the adapter is inserted into the battery insertion slot, or a jack is provided separately from the battery insertion slot on the tool body, and the plug of the electric cord is directly inserted into the jack. Thus, there has been proposed a power tool that uses a battery separately from the main body (see Patent Document 1).

  Further, in the same manner as described above, a power tool that can be used for a long time without dramatically increasing the weight of the tool is provided. A battery pack is mounted on a belt, and the belt is attached to clothing. A portable power tool has been proposed that allows the use of a power tool by attaching and holding it, and connecting the electric cable led out from the battery pack to a power tool held in the hand of an operator. (See Patent Document 2).

  In response to the above-mentioned demands for power up and reduction of total weight in the cordless power tool, the disadvantage of the power tool using the conventional secondary battery is solved by charging the electric double layer capacitor and using it as a power source. Various cordless power tools configured to be able to be used have been proposed.

  For example, a portable electric tool having a configuration including a power storage device including an electric double layer capacitor to which a secondary battery and a DC / DC converter are connected and a charging circuit for charging the electric double layer capacitor has been proposed. . The portable power tool configured as described above requires a conventional commercial power supply with almost the same amount of energy as a conventional secondary battery alone by combining a secondary battery and an electric double layer capacitor. Since the same power as that of the electric tool can be output, a rechargeable portable electric tool having high power and excellent operability and workability is configured (see Patent Document 3).

  A power source having a large-capacitance capacitor; a motor whose rotational speed is set according to a voltage from the power source; and a control circuit that controls the operation of the motor. A cordless system that is configured to control the motor at a constant speed based on the rotation speed detected by the rotation speed sensor when the capacitor voltage of the power supply is higher than the drive voltage of the motor. A type of power tool has been proposed. The electric power tool configured in this way can be charged / discharged by a large current instantaneously, and has a configuration that prevents the voltage from being lowered and the tool output from being lowered according to the discharge (see Patent Document 4). .

  In addition, as an improved power tool using the above-described conventional secondary battery, after the charged battery is exhausted by providing an adapter that can supply driving power from the charging device to the cableless electric device via the cable. However, there has been proposed an adapter for a charging device that allows a user to continue to use an electric device as a cable-type electric device without waiting for the battery to be charged again (see Patent Document 5). ).

  That is, the adapter for a charging device described in Patent Document 5 is an adapter that supplies charging power supplied from a charging device for charging a battery pack to a load made of an electrical device, and is connectable to the load side. A power supply device as a device-side adapter that incorporates a capacitor and supplies power to the load, and can be attached to the charging device to control the charging voltage of the charging device and to the capacitor of the power supply device via a power line (cable) And a connection device as a charging side adapter for supplying power.

  As an improvement to the above-described conventional proposal, the present applicant provides a power pack that uses a capacitor instead of the conventional secondary battery, and connects the power pack capacitor to the AC / DC power converter. The power tool can be used simply and appropriately as a power source, and the continuous operation process corresponding to the charging capacity of the capacitor field and the recharging door with a relatively short pause are repeated to Capacitor power supply device that can be used continuously and can solve the problems associated with conventional power cord connection type power tools and cordless power tools that use secondary batteries A tool and its driving method were developed and a patent application was filed (see Patent Document 6).

Japanese Utility Model Publication No. 03-062783 Japanese Patent Laid-Open No. 11-221783 Japanese Patent Laid-Open No. 2003-048177 JP 2001-129769 A International Publication WO01 / 080396 JP 2010-263669 A

  Each of the electric power tool or power tool proposed in Patent Document 1 and Patent Document 2 described above can be used by separating the battery from the tool body, and the weight of the battery is removed from the tool body. There is an advantage that it can be made light and easy to handle.

  However, in such a system for connecting the battery power source, there is an advantage that the battery can be separated from the tool body and the tool can be reduced in weight to facilitate the work, but the battery power source can be used with a necessary holder, It is necessary to attach to a part of the worker's work clothes. For this reason, when the operator interrupts the work or temporarily suspends the work, the electric cord is connected and the electric tool and the battery are not disconnected. Workers cannot move freely by leaving them where they are needed. That is, the worker has the trouble of always holding the electric power tool together with the battery power source. Further, since the electric cord is exposed to the outside, there is a difficulty in getting in the way of work.

  Further, in the conventional battery power supply connection method, since the battery power supply is always connected to the power tool, an accident such as an inability to connect the power supply or an electric leakage occurs due to a defect in the electric cord or its connection tool or component. There are disadvantages such as unnecessary consumption of the battery power. Moreover, in the conventional battery power supply connection method, the operation of attaching / detaching the electric cord to / from the electric tool is troublesome, and even if the electric cord is disconnected, an unexpected accident occurs in the electric cord that is energized with the battery power source. There is a fear that handling of the electric tool becomes troublesome.

  On the other hand, in the cordless electric tools proposed in Patent Document 3 and Patent Document 4 described above, the time for continuous work cannot be increased, but depending on the arrangement of the connection circuit of the capacitors used. According to the type of work, it can be set so as to obtain the required power, and there is an advantage that the charging time for these capacitors can be remarkably shortened as compared with the secondary battery.

  However, as described above, in a conventional cordless power tool that uses a chargeable / dischargeable capacitor as a power source, it is necessary to frequently charge the capacitor, and thus it is still impossible to eliminate the use of a secondary battery. Currently, tools are manufactured. Therefore, when working with such a power tool, it is necessary to prepare a spare battery pack, replace the battery pack as necessary, and charge the spare battery pack in the meantime. There are difficulties such as increased costs and reduced work efficiency.

  Furthermore, the adapter for a charging device described in Patent Document 5 is configured to be connected to a charging device for charging a battery pack attached to a cordless electric tool, and is connected to the charging device. A charging-side adapter as a connecting device and a device-side adapter as a power supply device exchangeably connected to the battery pack of the electric tool, and connecting the charging-side adapter and the device-side adapter via a power line Thus, the electric tool is configured to be driven.

  Therefore, the adapter for the above-described charging device appropriately matches the device-side adapter in the circuit configuration of the charging-side adapter so that the charging device for charging the battery pack can be connected in common. Therefore, there are problems such as complicated design and configuration and complicated handling.

Therefore, the present inventor has conducted intensive studies and trial production so that the handling of the electric power tool can be further simplified and the working efficiency by using the electric power tool can be further improved.
In the power supply system for the electric power tool described in Patent Document 6 described above, the rotational torque (screw tightening torque) required for the electric power tool is related to the capacitor provided in the power supply pack detachably coupled to a part of the gripping case of the electric power tool body. When using a commercially available capacitor to obtain a battery, for example, a volume corresponding to 3 to 4 single 1 or 2 single batteries is required, and the form and weight of the power pack is increased, which adversely affects operability. Therefore, the installation as a power pack removably coupled to a part of the gripping case of the electric tool main body is omitted, and the electric power is within the limits that do not affect the shape and weight of the gripping case. A relatively small-capacitance capacitor is attached to the tool drive control circuit and connected to a commercial power source to charge the capacitor. By providing a large-capacity capacitor in the charge control device including a rectifier and a rectifier circuit, the capacitor built in the gripping case of the electric power tool body can be smoothly charged and discharged, and all the above-mentioned various problems are solved. It has been found that a power system for a power tool that can be eliminated can be obtained.

  As an alternative, installation as a power pack removably coupled to a part of the gripping case of the power tool main body is omitted, and a power cord is directly connected to the power tool driving means for the gripping case. A power pack as a power repeater that includes a plurality of capacitors connected in series or in parallel at a position separated from the connection point of the electric power tool of the power cord within a range around the worker's body. It has been found that a power supply system for an electric tool that can solve all the various problems described above can be obtained by providing the power tool.

  In other words, in this case, a power supply pack configured by connecting a plurality of capacitors in series or in parallel, and a transformer and a rectifier circuit for connecting to a commercial power supply and charging the capacitors of the power supply pack are simply provided. A charge control device having the above configuration, and connecting the power pack as a power relay to the charge control device and the drive control circuit of the power tool, It can be configured as a power supply system.

  In the case where a power pack is provided as the power repeater, a capacitor that charges and discharges is used as a power source for the power tool. Therefore, in order to appropriately maintain a current capacity for the power tool, the power pack is attached to the power tool. It is preferable to be provided on the power cord near the connection point.

  In the case where the power pack is provided as described above, a small-capacity capacitor is provided to a part of the gripping case of the power tool body within a limit that does not affect the form and weight of the power tool drive control circuit. It is also possible to add it. Furthermore, in the case of providing a power pack as the power repeater, in the charging control device, without providing a small-capacity capacitor in the gripping case of the power tool body, or without providing the small-capacitance capacitor, By providing a large-capacity capacitor, the function of the capacitor provided in the power pack or the like in the electric tool can be more effectively exhibited.

  Therefore, an object of the present invention is to omit the installation of a power pack or the like that is detachably connected to a part of the gripping case of the power tool body, and to connect the power cord directly to the drive control circuit of the power tool with respect to the gripping case. Power supply system in the power cord connection method and cordless method for conventional power tools by configuring the power supply consisting of the capacitor to the gripping case of the power tool body with a configuration and arrangement that will be the minimum form and weight It is an object of the present invention to provide a power supply system for an electric power tool that can solve the above problems.

In order to achieve the above object, a power system for a power tool according to claim 1 of the present invention drives the power tool within a range that does not affect the shape and weight of the gripping case of the power tool body. Provide a small capacitor for the control circuit,
Charging provided with a control circuit provided with a large-capacity capacitor for performing AC / DC power conversion and charging / discharging control of the small-capacitance capacitor, including a transformer and a rectifier circuit for charging the small-capacity capacitor A control device,
A small-capacitance capacitor provided in the drive control circuit of the electric tool and a large-capacity capacitor provided in the charge control device are directly connected to each other through a lightweight power cord.

  According to a second aspect of the present invention, there is provided a power supply system for a power tool, in which a plurality of capacitors are connected in series or in parallel, and a power supply pack is connected to a commercial power supply to charge the capacitors of the power supply pack. A charge control device comprising a transformer and a rectifier circuit, wherein the power supply pack is a power relay for the charge control device, and the power control cord is lightweight with respect to the charge control device and the drive control circuit of the electric tool. It is characterized by connecting via.

  The power supply system for an electric tool according to claim 3 of the present invention, wherein the power pack as a power relay connected to the power cord is within a range around the operator's body from the connection point of the electric tool of the power cord. The power cord is configured to be directly connected to the drive control circuit of the power tool with respect to the gripping case of the power tool.

  According to a fourth aspect of the present invention, there is provided a power supply system for a power tool, wherein a small-capacity capacitor is connected in a gripping case of the power tool so that a small capacity capacitor can be charged and discharged when the power cord is connected to the drive control circuit of the power tool It is characterized by having an arrangement.

  According to a fifth aspect of the present invention, there is provided a power supply system for a power tool, wherein the power supply cord and the charge control device are connected to a power supply pack as a power supply relay connected via the power supply cord. It is characterized in that a large-capacity capacitor is provided for connection to the charge / discharge control circuit.

  According to the power supply system for the electric tool of the first aspect of the present invention, the power tool drive control circuit is small in the range in which the shape and weight of the gripping case of the electric tool main body are not affected. A capacitor having a capacity, a transformer for charging the capacitor having a small capacity, and a rectifier circuit are provided to perform AC / DC power conversion and to provide a capacitor having a large capacity for charge / discharge control of the capacitor having a small capacity. A charge control device having a simple configuration provided with a control circuit is provided, and a small-capacity capacitor provided in the drive control circuit of the electric tool and a large-capacity capacitor provided in the charge control device are combined with a lightweight power cord 36. In the form and weight of the power tool, it is possible to directly connect to each other via a storage battery such as a conventional battery, a capacitor, or an adapter. Since the like can be minimized in the form and weight as compared with the method for connecting the can operability of the power tool to improve work efficiency becomes extremely good.

  In particular, in the power supply system for an electric tool having the above-described configuration, for example, the electric motor is continuously driven for 10 to 20 seconds corresponding to the charging capacity of a small-capacitance capacitor provided on the electric tool side, and 5 to 10 screws are tightened. The capacitor is continuously connected to a charging control device provided with a large-capacity capacitor connected to a commercial power source, and the large-capacitance capacitor from the large-capacity capacitor is stopped when the power tool is stopped. It is possible to complete charging of the small-capacitance capacitor on the power tool side in a few seconds by supplying power, and when the power tool is used, a substantially continuous operation is achieved by repeating each stop / operation for a short time. It can contribute to the improvement of work efficiency by using a tool.

  According to the power supply system of the electric tool of claim 2 of the present invention, a plurality of capacitors are connected in series or in parallel to constitute a power supply pack, and connected to a commercial power supply to charge the capacitors of the power supply pack. A charging control device including a transformer and a rectifying circuit for performing is provided, and the power supply pack is connected to the charging control device as a power relay for the charging control device and the drive control circuit of the electric tool. By adopting a configuration, in the form and weight of the electric tool, it can be made the minimum form and weight compared to the conventional method of connecting a storage battery such as a battery, a condenser or an adapter, and so on. Similarly, the operability of the electric tool becomes extremely good, and the work efficiency can be improved.

  According to the power supply system for the electric power tool of the third aspect of the present invention, when the power supply pack and the electric power tool are connected by the power cord, the power supply pack is separated from the connection point of the electric power tool within a range around the operator's body. By setting the position, the power cord connected to the power pack can be a lightweight power cord corresponding to the charge capacity of the capacitor of the power pack, and the charge / discharge function of the capacitor of the power pack can be used. Since it is possible to work with a continuous electric tool by adapting, it is possible to always achieve a safe and efficient work for an operator without hindering the operability of the electric tool described above.

  According to the power supply system for an electric tool described in claim 4 of the present invention, it is possible to provide a capacitor for the drive control circuit of the electric tool within a range that does not affect the form and weight of the electric tool. In this case, the drive control function of the electric tool can be further expanded or improved by providing the power pack with the capacitor.

  According to the power supply system for an electric tool described in claim 5 of the present invention, a large capacity capacitor is provided in the control circuit for charge / discharge control of the capacitor even in the charge control device for charging the power pack. Thus, the charging function for the capacitor of the power pack can be further expanded or improved.

It is explanatory drawing which shows the schematic circuit structure as a 1st embodiment of the power supply system of the electric tool which concerns on this invention. It is explanatory drawing which shows schematic structure about the connection state of the apparatus structure and electric tool in the power supply system of the electric tool shown in FIG. It is explanatory drawing which shows the schematic circuit structure as a 2nd embodiment of the power supply system of the electric tool which concerns on this invention. It is explanatory drawing which shows schematic structure about the connection state of the apparatus structure and power tool in the power supply system of the power tool shown in FIG. It is explanatory drawing which shows the schematic circuit structure as a 3rd embodiment of the power supply system of the electric tool shown in FIG.

  Next, embodiments of a power supply system for an electric power tool according to the present invention will be described in detail below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 and FIG. 2 respectively show a schematic circuit configuration as one embodiment in the power supply system for an electric power tool according to the present invention, a device configuration thereof, and a schematic configuration regarding a connection state with the electric power tool.

  1 and 2, reference numeral 10 is an electric power tool, 30 is an AC / DC power conversion and charging / discharging control of a capacitor, and 40 is a commercial power source. The electric tool 10 is configured as an electric screwdriver including a driver bit that performs a tightening operation such as a screw. As shown in FIG. 1, the main body of the electric power tool 10 is provided with an electric motor 12 for rotationally driving the driver bit and a drive control circuit 14 for driving and controlling the electric motor 12. Reference numeral 16 indicates a drive switch of the electric motor 12.

  As a power supply system for the electric power tool 10, a small-capacitance capacitor 15 is provided for the drive control circuit 14 of the electric power tool 10 within a range that does not affect the form and weight of the electric power tool 10. In order to charge the capacitor 15, a charge control device 30 including a transformer 32 and a rectifier circuit to perform AC / DC power conversion and a control circuit 34 to perform charge / discharge control of the capacitor is provided. A large-capacity capacitor 33 is provided for the control circuit 34 of the charging control device 30.

  In this way, the large-capacity capacitor 33 provided in the charge control device 30 is directly connected to the small-capacitance capacitor 15 provided in the drive control circuit 14 of the electric tool 10 via the power cord 36. Is done.

  In the power system of the power tool in the present embodiment having the above-described configuration, the charging control device 30 is connected to the commercial power source 40 via the commercial power source connection plug 42, and the power switch 39 is turned on, so that The capacitor 33 having the capacity is charged, and the capacitor 15 having a small capacity provided in the power tool 10 is charged through the power cord 36, so that the power tool 10 can be set in an operation standby state. In this case, the electric capacity charged in the small-capacitance capacitor 15 is such that the drive switch 16 of the electric motor 12 in the electric power tool 10 is turned ON, and the electric motor 12 is continuously driven to maintain a discharge time suitable for performing the required work. Is set as follows.

  Therefore, when the drive switch 16 of the electric motor 12 in the electric tool 10 is turned ON, the electric motor 12 is driven via the drive control circuit 14 by the electric power charged in the small-capacitance capacitor 15, and the electric tool 10 is required. Can be done. Thus, after the electric power charged in the small-capacity capacitor 15 is discharged, the small-capacity capacitor can be obtained by turning off the drive switch 16 of the electric motor 12 together with the completion of the required work by the electric tool 10. 15 can be recharged in a short time by the large-capacity capacitor 33 of the charge control device 30.

  Therefore, according to the power supply system of the present embodiment, when the charging control device 30 and the power tool 10 are connected by the power cord 36, the small-capacitance capacitor 15 is changed from the large-capacity capacitor 33 to the small-capacitance capacitor 15. A lightweight power cord 24 corresponding to the charging capacity can be used, and it is possible to perform work with the continuous electric power tool 10 in conformity with the charging / discharging function of the small capacity capacitor 15.

  For example, in the power supply system of the present embodiment, the motor 12 is continuously driven for 10 to 20 seconds corresponding to the charging capacity of the small-capacitance capacitor 15 provided on the electric tool 10 side, and 5 to 10 screw tightening operations are continued. The capacitor 15 is always connected to the charging control device 30 provided with the large-capacity capacitor 33 connected to the commercial power supply 40, and the large-capacity is set when the electric tool 10 is stopped. The power supply from the capacitor 33 can complete the charging of the small-capacitance capacitor 15 on the power tool 10 side within a few seconds, and the power tool 10 can be used substantially continuously by repeatedly stopping and operating for a short time. Can be achieved and contribute to the improvement of work efficiency by using the electric power tool 10.

(Second Embodiment)
FIG. 3 and FIG. 4 respectively show a schematic circuit configuration as another embodiment in the power supply system of the electric tool according to the present invention, an apparatus configuration thereof, and a schematic configuration regarding a connection state with the electric tool. . In the present embodiment, for convenience of explanation, the same components as those in the embodiment shown in FIGS. 1 and 2 will be described with the same reference numerals.

  In this embodiment, as shown in FIG. 3 and FIG. 4, a power pack 20 is provided which is configured by connecting a plurality of capacitors 22 made of, for example, electric double layer capacitors in series or in parallel. Via a cord 36, a transformer 32 and a rectifier circuit for charging the capacitor 22 are provided, and AC / DC power conversion is performed, and a charge control device 30 having a control circuit 34 for controlling charge / discharge of the capacitor is connected. In addition, it is configured to be directly connected to a drive control circuit 14 that controls the drive of the electric power tool 10 via a power cord 24.

  In the power supply system of the electric tool in the present embodiment having the above-described configuration, the charging control device 30 is connected to the commercial power supply 40 via the commercial power supply connection plug 42, and the power switch 39 is turned on to turn on the power supply. The capacitor 22 of the pack 20 is charged, and the operation standby state of the electric power tool 10 can be set. In this case, the electric capacity charged in the capacitor 22 of the power supply pack 20 is such that the drive switch 16 of the electric motor 12 in the electric power tool 10 is turned ON, and the electric motor 12 is continuously driven to maintain a discharge time suitable for performing the required work. Is set as follows.

  Therefore, when the drive switch 16 of the electric motor 12 in the electric tool 10 is turned ON, the electric motor 12 is driven via the drive control circuit 14 by the electric power charged in the capacitor 22 of the power pack 20, and required by the electric tool. Can be done. In this way, after the electric power charged in the capacitor 22 of the power pack 20 is discharged, the drive switch 16 of the electric motor 12 can be turned OFF together with the completion of the required work by the electric tool. The capacitor 22 can be recharged in a short time by the charge control device 30.

  Therefore, according to the power supply system of the present invention, when the power pack 20 and the power tool 10 are connected by the power cord 24, the power pack 20 is separated from the connection point of the power tool 10 within a range around the operator's body. For example, by setting the distance of about 1 m from the connection point, the power cord 24 can be used as a lightweight power cord 24 corresponding to the charging capacity of the capacitor 22 of the power pack 20. It is possible to perform a continuous operation with the electric power tool 10 in conformity with the charge / discharge function of the capacitor 22.

  Similarly to the case described above, the power cord 36 that connects the power pack 20 and the charge control device 30 also supplies power for charging the capacitor 22 of the power pack 20, so that it matches the charge capacity of the capacitor 22. A lightweight power cord 36 can be used.

  Further, when the operation by the electric power tool 10 is performed by operating the drive switch 16 for driving the electric motor 12 of the electric power tool 10, the electric motor 12 has a time corresponding to the charging capacity of the capacitor 22 of the power pack 20. The capacitor 22 is always connected to the charging control device 30 via the commercial power supply 40. When the drive switch 16 is turned off, the capacitor 22 is set to be charged in a short time. In this way, the power tool 10 can be used continuously by repeating the ON / OFF operation of the drive switch 16 in a relatively short time.

(Third embodiment)
FIG. 5 shows a schematic circuit configuration as still another embodiment of the power supply system for an electric tool according to the present invention, and shows a modified embodiment of the power supply system for the electric tool having the configuration shown in FIG. is there. Therefore, in this embodiment, for convenience of explanation, the same reference numerals are used for the same components as the circuit configurations shown in FIGS. 1 and 3 described above. Therefore, the schematic configuration of the connection between the apparatus configuration and the power tool in this embodiment is as shown in FIG.

  That is, in the embodiment shown in FIG. 5, in the configuration of the electric power tool 10 shown in FIG. 3, the drive control circuit 14 of the electric power tool 10 has a range that does not affect the form and weight of the electric power tool 10. On the other hand, a small-capacitance capacitor 15 is provided as in the embodiment shown in FIG. As described above, by providing the capacitor 15, the drive control function of the electric power tool 10 can be further expanded or improved by providing the power supply pack 20 together with the capacitor 22.

  Further, in the embodiment shown in FIG. 5, in the configuration of the charging control device 30 shown in FIG. 3 described above, charging / discharging is performed on the power supply pack 20 as a power supply relay connected via the power supply cord 36. It is possible to provide a large-capacity capacitor 33 for the purpose. Thus, by providing the large-capacity capacitor 33 in the charge control device 30, the charging function for the capacitor 22 of the power pack 20 can be further expanded or improved. When the capacitor 33 having the capacity is provided, the capacitor 15 provided for the drive control circuit 14 of the electric tool 10 can be omitted and, of course, both the capacitors 15 and 33 can be provided. It is.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric tool 12 Electric motor 14 Drive control circuit 15 Small capacity capacitor 16 Drive switch 20 Power pack 22 Capacitor 24 Power cord 30 Charge control device 32 Transformer 33 Large capacity capacitor 34 Control circuit 36 Power cord 38 Power switch 40 Commercial power source 42 Plug for commercial power connection

Claims (5)

For the gripping case of the power tool body, a small-capacity capacitor is provided for the drive control circuit of the power tool within a range that does not affect the form and weight,
Charging provided with a control circuit provided with a large-capacity capacitor for performing AC / DC power conversion and charging / discharging control of the small-capacitance capacitor, including a transformer and a rectifier circuit for charging the small-capacity capacitor A control device,
A power source for an electric tool, wherein a small-capacity capacitor provided in the drive control circuit of the electric tool and a large-capacity capacitor provided in the charge control device are directly connected to each other via a lightweight power cord. system.   A power supply pack configured by connecting a plurality of capacitors in series or in parallel, and a charge control device including a transformer and a rectifier circuit for connecting to a commercial power supply and charging the capacitors of the power supply pack, An electric power supply system for an electric tool, wherein the electric power pack is connected to the charge control device and the drive control circuit of the electric tool via a light power cord as a power repeater.   The power pack as a power relay connected to the power cord is set at a position separated from the connection point of the power tool of the power cord within the range around the operator's body, and the power cord is gripped by the power tool. The power supply system for an electric tool according to claim 2, wherein the case is configured to be directly connected to a drive control circuit of the electric tool with respect to the case.   4. A structure in which a small-capacitance capacitor is connected and arranged so as to be chargeable / dischargeable when the power cord is connected to the drive control circuit of the power tool in the gripping case of the power tool. Power tool power system. In the charge control device, a large-capacity capacitor is provided for connecting the power cord and a charge / discharge control circuit of the charge control device to a power pack as a power repeater connected via the power cord. The power supply system for an electric tool according to any one of claims 2 to 4, wherein the power supply system is configured.

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