JP2005278375A - Dc power supply unit and adapter used for dc power supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable power adjustment such as torque adjustment without degrading usability in electrically powered equipment such as a power tool which does not have power adjustment function. <P>SOLUTION: An output voltage regulator 301, an output current regulator 302, and an output stop regulator 303 are provided at a power regulator 3b of an adapter 3 to set the time until the power supply to be supplied to the power tool 4 is stopped. The power regulator 3b transmits signals based on the preset value to a DC power supply body 2. The DC power supply body 2 detects the signals, and supplies electric power to the power tool 4 with voltage/current based on a preset value to stop the power supply at the preset time. The signals are transmitted to the DC power supply body 2 through a cord 316 or wireless communication, thus performing torque adjustment of the power tool 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a DC power supply device and an adapter for supplying electric power from the DC power supply device to an electric tool or the like.

  2. Description of the Related Art Conventionally, torque control of an electric tool includes one having a clutch mechanism on an output shaft portion, and performing rotation speed control by changing a motor power supply voltage. For example, in an electric tool driven by a commercial AC power supply, the torque can be adjusted by controlling the motor rotation speed by changing the supply voltage by a voltage conversion device using a transformer or the like.

In order to adjust the torque by means of supplying power to the electric tool using the DC power supply device, for example, the electric tool main body is provided with means for setting a power supply voltage to the motor, a counter for the number of hits, a timer, etc. There is a method for controlling the rotation speed of the motor and the power supply interruption to the motor (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 10-180643 (page 2-4, FIG. 1)

  However, an electric power tool driven by a commercial AC power source has a problem that torque adjustment cannot be performed quickly when the place where the voltage conversion device such as a transformer is installed is away from the work place. There is also a cordless power tool that uses a storage battery as a power source and is equipped with a torque control means. However, the cordless power tool has a problem that the battery voltage of the storage battery changes during use and the set torque also changes.

  In the case where power is supplied to the power tool using the DC power supply device, stable power can be supplied, so that a constant torque can always be maintained. However, it is necessary to provide a torque adjustment function in the power tool main body, which is larger and heavier than a power tool that does not have a torque adjustment function.

  The present invention has been made in view of the above problems, and enables a power adjustment such as a torque adjustment of an electric device without increasing the size or weight of the electric device main body such as a cordless electric tool. It is an object of the present invention to provide an adapter for connecting a motor and an electric device, and a DC power supply device including the adapter and a DC power source.

  The invention described in claim 1 made to achieve the above object is a DC power supply device having a DC power supply main body and an adapter, wherein the DC power supply main body adjusts output power to desired power. An adjustment circuit is provided, the alternating current supplied from the alternating current power source is converted into direct current and output, and the adapter is provided with power adjustment means for adjusting the power supplied to the electric equipment and transmitting it to the power adjustment circuit. A DC power supply device that supplies output DC to an electric device.

  According to such a configuration, the DC power supply device according to claim 1 includes the DC power supply main body and the adapter. The adapter has power adjustment means, and adjusts the supply voltage and current from the DC power source body by the power adjustment means.

  The invention according to claim 2 is the DC power supply device characterized in that the power adjusting means adjusts the time until the supply of power to the electric equipment is cut off.

  According to a third aspect of the present invention, the adapter further includes a fitting portion connected to the electric device, and the power adjusting means is provided in the fitting portion. At this time, the power adjustment means may adjust the voltage or current, or may adjust the time until the supply of power is cut off.

  In the invention according to claim 4, the power adjustment means sends a signal for adjusting the time until the supply of power is cut off in a frequency band different from the power supplied from the DC power supply body to the electric device via the adapter. A DC power supply device that transmits a signal to a DC power supply main body through an adapter as a signal.

  According to a fifth aspect of the present invention, in the DC power supply device, the power adjustment means transmits a signal for adjusting a time until the supply of power is cut off to the DC power supply body by wireless communication.

  The invention according to claim 6 is a connection means connected to a DC power source body provided with a power adjustment circuit for adjusting output power to desired power, and a fitting portion inserted into a battery storage portion of the electric device. A power adjustment unit that adjusts the power supplied to the electric device and transmits the electric power to the power adjustment circuit, and supplies the electric power supplied from the DC power supply main body to the electric device via the connection unit and the fitting unit. It is an adapter characterized by doing.

  The invention according to claim 7 is an adapter characterized in that the power adjusting means adjusts the time until the supply of power to the electric device is cut off.

  The invention according to claim 8 is the adapter characterized in that the power adjusting means is provided in the fitting portion. At this time, the power adjustment means may adjust the voltage or current, or may adjust the time until the supply of power is cut off.

  In the ninth aspect of the present invention, the power adjustment means uses a signal for adjusting the time until the supply of power is cut off as a signal in a frequency band different from the power supplied to the electric device via the connection means. It is an adapter characterized by transmitting to a DC power source body.

  According to a tenth aspect of the present invention, the power adjusting means is an adapter characterized in that a signal for adjusting a time until the power supply is cut off is transmitted to the DC power source body by wireless communication.

  According to the first aspect of the present invention, the power adjustment unit is provided with the power adjustment means to adjust the power. Therefore, the power adjustment such as torque adjustment without increasing the size or weight of the electric device main body such as the cordless electric tool. It can be performed. Further, the adapter can be kept away from the DC power source main body, and power adjustment can be performed at hand even when working away from the DC power source main body.

  According to the invention described in claim 2, by adjusting the time until the power adjustment means cuts off the supply of power to the electric device and performing power adjustment such as torque control of the electric tool, an excessive time, It is possible to prevent inconvenience such as screw breakage caused by supplying electric power to the power tool.

  According to the invention described in claim 3, since the power adjusting means can be provided in the fitting portion of the adapter, the conventional electric device can be used as it is without increasing the size of the adapter. There will be no obstacle to the work using

  According to the invention described in claim 4, the power adjustment means transmits the signal as a signal in a frequency band different from the power supplied from the DC power supply main body to the electric equipment, and transmits it through the same adapter as the power supply. There is no need to increase the number of connection means.

  According to the fifth aspect of the present invention, since the signal from the power adjustment means is transmitted by wireless communication and received by the DC power source main body, there is no need to increase the number of connection means, and the signals interfere with each other in the connection means. There is no fear.

  According to the invention described in claim 6, since the adapter includes means for adjusting the power supplied to the electric device, the adapter can be applied to an electric device that does not include the power adjustment means to perform power adjustment. It becomes possible.

  According to the invention described in claim 7, it is possible to adjust the power by adjusting the time to cut off the supply of power, such as the destruction of the screw by supplying the power to the electric tool for an excessive time. Inconvenience can be prevented. .

  According to the invention described in claim 8, since the power adjusting means is provided in the fitting portion, the adapter does not increase in size, and can be applied to a conventional electric device.

  According to the ninth aspect of the present invention, the power can be adjusted via the connecting means for connecting the DC power source main body and the adapter, and the number of parts does not increase.

  According to the invention described in claim 10, since the signal for power adjustment is transmitted wirelessly, it is not necessary to increase the number of connection means, and there is a possibility that the signals interfere with each other in the connection means for power supply. Absent.

  As described above, according to the present invention, the power adjusting means is provided in the fitting portion of the adapter connected to the electric tool, and the connecting means for supplying electric power from the DC power supply device to the electric tool at the set frequency is set. It is possible to adjust the time until the voltage or current or the output is cut off by transmitting to the DC power source main body without using the connection means. This provides a DC power supply device and an adapter that enable power adjustment such as torque control without increasing the number of connecting means such as cables in an electric tool or the like that does not have torque control and without impairing its usability. be able to.

  A DC power supply device and an adapter according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the DC power supply device 100, the electric tool 4, and the battery pack 5.

  The DC power supply device 100 includes a cord 1, a DC power supply main body 2, an adapter 3, and the like. Cord 1 is an AC cord set and is connected to an outlet such as a commercial power source. The DC power supply main body 2 is a DC power supply device main body with a charging function (hereinafter simply referred to as a DC power supply main body), which converts electric power from a commercial power source into predetermined DC power and outputs it. The DC power source main body 2 has a connection portion 200 and is connected to the adapter 3 when supplying power to a cordless power tool (hereinafter simply referred to as a power tool) 4 via the adapter 3. The DC power source body 2 also has a function of charging a battery pack 5 that can be attached to and detached from the electric tool 4.

  The adapter 3 is an adapter set that connects the DC power source body 2 and the electric tool 4. One end of the main body 312 of the adapter 3 has an adapter plug 310 connected to the electric power tool 4, and the other end has a connector 314 and a power cable 316 serving as connection means for connecting to the DC power source main body 2. The adapter plug 310 has a fitting portion whose upper portion has the same shape as the insertion portion 500 of the battery pack 5, and can be attached to and detached from the electric tool 4 in the same manner as the battery pack 5.

  The main body 312 of the adapter 3 has power adjusting means 3b. The power adjustment unit 3b includes an output voltage adjustment unit 301, an output current adjustment unit 302, an output stop adjustment unit 303, and the like. The output voltage adjusting unit 301, the output current adjusting unit 302, and the output stop adjusting unit 303 are configured by a dial type variable resistor that can change a set value when rotated.

  The electric tool 4 is a cordless electric tool such as an electric drill, an electric driver, or an impact driver. The electric tool 4 is supplied with electric power when the switch 4b is pulled in, and the motor can rotate to perform a predetermined operation.

  The battery pack 5 is a storage battery that can be used as a power source for the electric tool 4 and can be charged by the DC power source body 2. The battery pack 5 has an insertion portion 500 and is attachable to and detachable from the electric tool 4.

  2 and 3 are block diagrams showing an embodiment of a DC power supply device with a charging function. A cord 1 in FIG. 1 is connected to an AC 100V commercial AC power source 102 and supplies power to the DC power source body 2. The adapter 3 and the battery pack 5 are detachably connected to the DC power source body 2. The adapter 3 and the battery pack 5 are detachably connected to the electric tool 4.

  The adapter 3 adjusts the time until the output voltage setting means 3a for outputting the voltage corresponding to each rated voltage to the various power tools 4, and the output voltage, current and power of the DC power source 2 are cut off. Power adjustment means 3b is provided.

  The power adjustment unit 3b includes an output voltage adjustment unit 301, an output current adjustment unit 302, an output stop adjustment unit 303, an adjustment signal transmission circuit 304, and the like. The output voltage adjusting unit 301 adjusts the output voltage to the electric tool 4. The output current adjusting unit 302 adjusts the current to the power tool 4. The output stop adjusting unit 303 adjusts the time until the output to the power tool 4 is cut off.

  The adjustment signal transmission circuit 304 can transmit a signal to the DC power supply main body 2 via the cable 316 at a frequency that does not hinder the operation of the electric power tool 4. Further, the adjustment signal transmission circuit 304 can transmit a signal to the DC power supply main unit 2 by wireless communication at a frequency that does not interfere with the operation of the electric power tool 4 or other electric devices without going through the cable 316.

  The electric tool 4 includes a DC motor 4a and a power switch 4b connected in series. When the power switch 4b is turned on, power is supplied from the DC power supply main body 2 via the adapter 3.

  The battery pack 5 that can be attached to the electric tool 4 includes a rechargeable storage battery 5a and a temperature element 5b (for example, a thermistor) that is attached in the vicinity of or in contact with the storage battery 5a.

  The switching power supply 10 outputs a predetermined drive voltage corresponding to the electric tool 4 having various drive voltages, or a switch that outputs a predetermined charge current so that various battery packs 5 having different battery voltages can be charged. Power supply. The switching power supply 10 includes a first rectifying / smoothing circuit 11, a high-frequency transformer 12, a second rectifying / smoothing circuit 13, a switching element 14, a switching control circuit 15 and the like. The switching control circuit 15 adjusts the output voltage or output current of the second rectifying / smoothing circuit 13 by changing the width of a pulse for driving the switching element 14.

  The power output control means 20 includes a voltage / current control circuit 21 and a voltage / current setting circuit 22. The voltage / current control circuit 21 controls the drive voltage of the electric tool 4 when the power switch 4b is turned on, and controls the charging current when the battery pack 5 can be charged when the power switch 4b is turned off. The voltage / current setting circuit 22 sets the drive voltage of the electric tool 4 and the value of the charging current to the battery pack 5.

  The power supply output control means 20 controls the switching duty of the switching element 14 by feeding back to the switching control circuit 15 based on the signal of the voltage detection circuit 42 when the electric tool 4 is driven, and at the same time, detects the output current. Based on the signal from the circuit 41, the voltage drop in the connector 314 and the cable 316 of the adapter 3 is corrected. Further, when the battery pack 5 can be charged when the power switch 4b is turned off, feedback is given to the switching control circuit 15 based on a signal from the output current detection circuit 41, and the switching duty of the switching element 14 is controlled, so that the battery The charging current to the pack 5 is controlled based on the output of the battery state detecting means 50.

  The power output switching means 30 includes a power output switch circuit 31 and a charge output switch circuit 32. The power output switch circuit 31 enables a power output to be supplied to the electric tool 4 when the power switch 4b is turned on. The charge output switch circuit 32 enables the battery pack 5 to be charged when the electric tool 4 is not used. The charge output switch circuit 32 is composed of, for example, a relay circuit.

  The power output detection means 40 includes an output current detection circuit 41, a voltage detection circuit 42, a trigger detection circuit 43, an output voltage setting detection circuit 44, a voltage / current adjustment circuit 45, and the like.

  The output current detection circuit 41 detects a current supplied to the electric tool 4 when the power switch 4b is turned on or a charging current supplied to the battery pack 5 when the power switch 4b is turned off. The voltage detection circuit 42 detects the output voltage of the second rectifying / smoothing circuit 13. The trigger detection circuit 43 detects that the power switch 4b is turned on, and at that moment, the power output switch circuit 31 is not allowed to charge the power output switch circuit 32 with a signal permitting power supply to the power tool 4. Output a signal. The output voltage setting detection circuit 44 detects the set voltage of the output voltage setting means 3 a of the adapter 3. The voltage / current adjusting circuit 45 detects a signal transmitted from the power adjusting unit 3b and outputs a signal for changing the output voltage and the maximum output current to the voltage / current setting circuit 22 or the microcomputer 60.

  The battery state detection unit 50 includes a battery voltage detection circuit 51 and a battery temperature detection circuit 52. The battery voltage detection circuit 51 detects the battery voltage of the battery pack 5. The battery temperature detection circuit 52 detects the battery temperature according to the characteristics of the temperature element 5 b in the battery pack 5.

  The microcomputer 60 sets the drive voltage of the electric tool 4 based on the output of the power supply output detection means 40 and sets the charging current of the battery pack 5 based on the output of the battery state detection means 50. Further, the microcomputer 60 cuts off a signal for setting the output voltage and the maximum output current and cutting off the power supply to the DC motor 4a based on the output of the voltage / current adjusting circuit 45 of the power supply output detecting means 40.

  The display circuit 70 is composed of LEDs and the like, and based on the output of the microcomputer 60, an indication that the electric tool 4 is in use, an indication whether the electric tool 4 is usable, an indication that the battery pack 5 is being charged, etc. I do.

  The auxiliary power supply circuit 80 supplies a reference voltage Vcc for the power supply of the microcomputer 60 and the like, the power supply output control means 20, the power supply output detection means 40, the battery state detection means 50 and the like.

  Next, the torque adjustment method of the electric tool 4 will be described using the output voltage / current relationship diagram shown in FIG. For torque adjustment, excessive power is supplied to the power tool body 2 or power is supplied to the power tool 2 for an excessive amount of time, for example, the screw thread is broken by the power tool body 2 that is an electric driver. It is done so that there is no. A relation line 90 is a voltage / current relation line supplied from the DC power supply main body 2 and indicates a value at a fitting portion between the adapter 3 and the electric tool 4. Usually, the relationship between voltage and current is set by the voltage / current setting circuit 22 so as to be similar to the relationship between the output voltage and current of the battery pack 5, and the voltage / current control circuit 21 is connected to the connector as the load current of the motor 4a increases. The output voltage is controlled as indicated by the relationship line 90 while correcting the voltage drop in the cable 316 and the cable 316.

  In order to prevent supply of excessive electric power to the electric power tool body 2, maximum torque adjustment is performed. In the maximum torque adjustment, the maximum output current 91 is set in advance by the voltage / current setting circuit 22 in accordance with the capability of the DC power source main body 2, and when the load current reaches the maximum output current 91, the voltage / current control circuit 21 Constant current control is performed so that no more current is supplied.

  Specifically, the value of the maximum output voltage 92 is set in advance by the output voltage adjusting means 301 and the value of the maximum output current 91 is set by the output current adjusting means 302 in accordance with the capability of the DC power supply main body 2, and the set value The adjustment signal transmission circuit 304 transmits a signal based on the above. When the DC power source 2 detects this signal and the load current reaches the maximum output current 91 and the load voltage reaches the maximum output voltage 92, the voltage / current setting circuit 21 performs constant current control, so that the maximum torque adjustment is possible. It becomes possible.

  Further, torque adjustment is performed in order to prevent excessive power supply to the electric power tool 2. In the torque adjustment, when the time from when the power switch 4b is turned on to when it is turned off is set by the output stop adjustment means 303, the adjustment signal transmission circuit 304 transmits a signal corresponding to the set time. The DC power source main body 2 detects this signal, and when the set time is reached, the microcomputer 60 stops supplying power to the DC motor 4a. In this way, torque adjustment can be performed without turning off the power switch 4b.

  The signal transmitted from the adjustment signal transmission circuit 304 is set to a frequency different from the power supplied from the DC power supply main body 2 to the power tool 4, so that the DC power supply main body 2 from the adapter 3 via the connector 314 and the cable 316 is used. To the microcomputer 60 or the voltage / current setting circuit 22. In addition, a signal transmitted from the adjustment signal transmission circuit 304 can be transmitted to the microcomputer 60 or the voltage / current setting circuit 22 of the DC power source body 2 by wireless communication.

  The preferred embodiments of the DC power supply device and the adapter used in the DC power supply device according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments. Those skilled in the art can make various modifications and improvements within the scope of the technical idea described in the claims.

  For example, the DC power supply main body 2, the adapter 3, and the electric tool 4 are not limited to the outer shape and the form shown in FIG. 1 and can be applied as long as they have similar functions. The circuit configurations of the DC power source main body 2 and the adapter 3 are not limited to the above-described configurations, and modifications can be made as long as the configurations have similar functions.

  The power adjustment means 3b is not limited to a dial type variable resistor, but may be another type such as a changeover switch. Further, the voltage value of the maximum output voltage 92, the current value of the maximum output current 91 set by the output voltage adjusting unit 301, the output current adjusting unit 302, and the output stop adjusting unit 303, and the time until the power is stopped can be any value. However, for example, a plurality of values may be set in advance and selected from them.

  The output voltage / current relationship diagram 90 is not limited to the relationship diagram shown in FIG. 4, and may have other current / voltage relationships, such as different rates of voltage change with respect to current.

  As described in detail above, according to the DC power supply device of the present invention and the adapter used for the DC power supply device, it is possible to easily adjust the power without increasing the size and weight of the electric device main body such as an electric tool. It becomes possible.

  The direct-current power supply device of the present invention and the adapter used for the direct-current power supply device can be used for electric tools such as an electric drill, an electric driver, and an impact driver.

The perspective view which shows the DC power supply device 100, the electric tool 4, and the battery pack 5. FIG. FIG. 3 is a block circuit diagram showing an embodiment of the DC power supply device 100, the electric tool 4, and the battery pack 5. FIG. 3 is a block circuit diagram of power adjustment means 3. FIG. 4 is an output voltage / current relationship diagram of the DC power supply device 100.

Explanation of symbols

1 code, 2 DC power supply body, 3 adapter, 4 electric tool, 5 battery pack, 100 DC power supply device, 200 connection part, 301 output voltage adjusting means, 302 output current adjusting means, 303 output stop adjusting means, 310 adapter plug, 312 Adapter body, 314 connector, 316 cord, 500 insertion part

Claims (10)

A DC power supply device having a DC power supply main body and an adapter,
The DC power source body includes a power adjustment circuit that adjusts the output power to a desired power, converts the AC supplied from the AC power source into a DC, and outputs the DC.
The adapter includes power adjustment means for adjusting the power supplied to the electric device and transmitting the electric power to the power adjustment circuit, and supplies the direct current output from the DC power source body to the electric device. DC power supply.   The DC power supply device according to claim 1, wherein the power adjustment unit adjusts a time until the supply of power to the electric device is cut off. The adapter further includes a fitting portion connected to the electric device,
The DC power supply device according to claim 1, wherein the power adjustment unit is provided in the fitting portion.   The power adjusting means adjusts the time until the power supply is cut off as a signal in a frequency band different from the power supplied from the DC power supply body to the electric device via the adapter. 4. The DC power supply device according to claim 2, wherein the DC power supply is transmitted to the DC power supply main body through an adapter. 5.   The DC power supply device according to claim 3, wherein the power adjustment unit transmits a signal for adjusting a time until the supply of power is cut off to the DC power supply body by wireless communication. Connection means connected to a DC power source body provided with a power adjustment circuit that adjusts output power to desired power;
A fitting portion to be inserted into the battery storage portion of the electric device;
Adjusting the power to be supplied to the electric device and transmitting the power to the power adjustment circuit;
With
An adapter that supplies electric power supplied from the DC power supply main body to the electric device to the electric device via the connection means and the fitting portion.   The adapter according to claim 6, wherein the power adjustment unit adjusts a time until the supply of power to the electric device is cut off.   The adapter according to claim 6, wherein the power adjustment unit is provided in the fitting portion.   The power adjustment means sends a signal for adjusting the time until the supply of power is cut off to the DC power supply main body as a signal in a frequency band different from the power supplied to the electric device via the connection means. The adapter according to any one of claims 7 and 8, wherein the adapter transmits.   The adapter according to claim 8, wherein the power adjustment unit transmits a signal for adjusting a time until the supply of power is cut off to the DC power supply body by wireless communication.

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