JP3192297U - Electric tool - Google Patents

Abstract

A power tool having high convenience and excellent charging efficiency is provided.
A power tool includes a USB unit, a charging unit, a control unit, a power storage unit, a voltage detection unit, a switch unit, and a motor unit. When the voltage of the power storage unit 108 is less than the first critical voltage value, the power storage unit 108 is charged with the first constant small current until the voltage of the power storage unit 108 exceeds the first critical voltage value. Next, the power storage unit 108 is charged with the constant current until the voltage of the power storage unit 108 exceeds the second critical voltage value. Next, the power storage unit 108 is charged with a constant voltage, and when the current charged in the power storage unit 108 becomes a second constant small current, the charging is stopped. In addition, when the transient voltage of the power storage unit 108 decreases and becomes equal to or lower than the third critical voltage value, the power storage unit 108 is automatically recharged again.
[Selection] Figure 1

Description

  The present invention relates to a power tool, and more particularly, to an improved power tool that is highly convenient and excellent in charging efficiency.

  Electric tools (such as electric screwdrivers) are widely used for assembling machines, devices, or articles, and can greatly increase the assembly speed. For this reason, a power tool is very important. However, conventional charging methods for electric tools are not very convenient and are not excellent in charging efficiency.

Utility Model Registration No.3093893

  An object of the present invention is to provide an improved electric tool having high convenience and excellent charging efficiency.

  In order to solve the above-described problems, the electric tool of the present invention is applied to a DC voltage supply device and is electrically connected to the DC voltage supply device. The electric tool is electrically connected to the USB unit electrically connected to the DC voltage supply device, the charging unit electrically connected to the USB unit, the control unit electrically connected to the charging unit, and the charging unit. A power storage unit connected to the power storage unit; a voltage detection unit electrically connected to the power storage unit and the control unit; a switch unit electrically connected to the power storage unit; and a motor unit electrically connected to the switch unit; ,including.

  The voltage detection unit is used for detecting the voltage of the power storage unit and notifying the control unit. When the voltage of the power storage unit is less than the first critical voltage value, the control unit controls the charging unit, and the first constant small current causes the power storage unit to remain in the power storage unit until the power storage unit voltage exceeds the first critical voltage value. Charge the battery.

  When the voltage of the power storage unit exceeds the first critical voltage value, the control unit controls the charging unit and charges the power storage unit with a constant current until the voltage of the power storage unit becomes equal to or higher than the second critical voltage value. .

  When the voltage of the power storage unit is equal to or higher than the second critical voltage value, the control unit controls the charging unit, charges the power storage unit with a constant voltage, and the current charged in the power storage unit is a second constant small current. When it becomes, charging stops.

  After the storage unit is fully charged, when the transient voltage of the storage unit drops below the third critical voltage value, the control unit controls the charging unit, performs floating charging on the storage unit, and is charged to the storage unit. When the current becomes the third constant small current and the transient voltage of the power storage unit exceeds the third critical voltage value, the floating charging is stopped.

  The second critical voltage value is greater than the first critical voltage value. The second critical voltage value is greater than the third critical voltage value. The third critical voltage value is greater than the first critical voltage value. The constant current is greater than the first constant small current. The constant current is greater than the second constant small current. The constant current is greater than the third constant small current.

  According to the present invention, the charging method of the electric tool can be made more convenient (the DC voltage supply device supplies power to the charging unit via the USB unit), and the charging efficiency can be increased.

1 is a block diagram illustrating a power tool according to a first embodiment of the present invention. It is a block diagram which shows the electric tool by 2nd Embodiment of this invention.

(First embodiment)
FIG. 1 is a block diagram illustrating a power tool according to a first embodiment of the present invention. The electric power tool 10 of the present invention is applied to the DC voltage supply device 20 and is electrically connected to the DC voltage supply device 20.

  The improved electric tool 10 having high convenience and excellent charging efficiency includes a USB unit 102, a charging unit 104, a control unit 106, a power storage unit 108, a voltage detection unit 110, a switch unit 112, and a motor unit 114.

  The USB unit 102 is electrically connected to the DC voltage supply device 20. The charging unit 104 is electrically connected to the USB unit 102. The control unit 106 is electrically connected to the charging unit 104. The power storage unit 108 is electrically connected to the charging unit 104. The voltage detection unit 110 is electrically connected to the power storage unit 108 and the control unit 106. Switch unit 112 is electrically connected to power storage unit 108. The motor unit 114 is electrically connected to the switch unit 112.

  The voltage detection unit 110 is used to detect the voltage of the power storage unit 108 and notify the control unit 106 thereof. The charging process is shown below.

  When the voltage of the power storage unit 108 is less than the first critical voltage value, the control unit 106 controls the charging unit 104 until the voltage of the power storage unit 108 exceeds the first critical voltage value due to the first constant small current. Then, the power storage unit 108 is charged.

  When the voltage of the power storage unit 108 exceeds the first critical voltage value, the control unit 106 controls the charging unit 104 until the voltage of the power storage unit 108 exceeds the second critical voltage value due to the constant current. Charge the battery.

  When the voltage of the power storage unit 108 is equal to or higher than the second critical voltage value, the control unit 106 controls the charging unit 104, charges the power storage unit 108 with a constant voltage, and the current charged in the power storage unit 108 is the first. When a constant small current of 2 is reached, charging is stopped.

  After the power storage unit 108 is fully charged, when the transient voltage of the power storage unit 108 falls below the third critical voltage value, the control unit 106 controls the charging unit 104 to perform floating charging on the power storage unit 108 to store the power. When the current charged in the unit 108 becomes the third constant small current and the transient voltage of the power storage unit 108 exceeds the third critical voltage value, the floating charging is stopped.

  The charging / discharging of the battery is due to an oxidation-reduction reaction. Since the potential of the battery floats upward during charging, the battery whose charging has been stopped has a phenomenon that the voltage drops, and this is referred to as transient voltage. Since the charging unit 104 of the present invention has an automatic recharging function, when the transient voltage of a fully charged battery drops below the third critical voltage value, the battery is automatically recharged and recharged. When the current becomes the third constant small current, charging is stopped. When the battery is stepped down again, the above steps are performed again and charging is repeated. When the transient voltage of the battery exceeds the third critical voltage value, the automatic charging function is not activated.

  The second critical voltage value is greater than the first critical voltage value. The second critical voltage value is greater than the third critical voltage value. The third critical voltage value is greater than the first critical voltage value. The constant current is greater than the first constant small current. The constant current is greater than the second constant small current. The constant current is greater than the third constant small current.

  The first critical voltage value is, for example, 2.5 volts (not limited to this). The second critical voltage value is, for example, 3.6 volts (not limited thereto). The third critical voltage value is, for example, 3.3 volts (not limited to this). The first constant small current is, for example, 100 milliamperes (not limited to this). The second constant small current is, for example, 100 milliamperes (not limited to this). The third constant small current is, for example, 100 milliamperes (not limited to this). The constant current is, for example, a current limit of 1000 milliamperes (not limited to this).

  The USB unit 102 is, for example, a micro USB (micro universal serial bus) (not limited to this). The charging unit 104 is, for example, a charging circuit (not limited to this). The control unit 106 is, for example, a microprocessor or a microcontroller (not limited to this). The power storage unit 108 is, for example, a rechargeable lithium battery (not limited to this). The voltage detection unit 110 is, for example, a voltage detection circuit or a voltage detector (not limited to this). The motor unit 114 is, for example, an electric tool motor (not limited to this).

  The switch unit 112 is, for example, a power switch (not limited to this), and is used to control the power storage unit 108 and supply power to the motor unit 114. The storage unit 108 supplies power to the motor unit 114 when the switch unit 112 is in a conductive state, and the storage unit 108 does not supply power to the motor unit 114 when the switch unit 112 is in a disconnected state.

(Second Embodiment)
FIG. 2 is a block diagram showing a power tool according to a second embodiment of the present invention. Parts similar to the first embodiment will not be described here. In the second embodiment, the improved power tool 10 having high convenience and excellent charging efficiency further includes a charging instruction unit 116. The charging instruction unit 116 is electrically connected to the control unit 106. The charging instruction unit 116 includes a two-color LED 118. The two-color LED 118 is electrically connected to the control unit 106. The two-color LED 118 includes red and green. When the power storage unit 108 is charged, the control unit 106 controls the two-color LED 118 to emit red light, and when the power storage unit 108 is not charged, the control unit 106 controls the two-color LED 118 to emit green light.

  According to the present invention, the charging method of the electric tool can be made more convenient (the DC voltage supply device 20 supplies power to the charging unit 104 via the USB unit 102), and the charging efficiency can be increased.

  The above description shows preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications that are equivalent effects based on the claims of the utility model registration of the present invention are included in the present invention.

  As can be seen from the above description, the present invention has industrial applicability, novelty and inventive step.

DESCRIPTION OF SYMBOLS 10 (Improved type) Electric tool 20 DC voltage supply device 102 USB unit 104 Charging unit 106 Control unit 108 Power storage unit 110 Voltage detection unit 112 Switch unit 114 Motor unit 116 Charging instruction unit 118 Two-color LED

Claims (10)

An electric tool applied to a DC voltage supply device and electrically connected to the DC voltage supply device,
The electric tool is
A USB unit electrically connected to the DC voltage supply device;
A charging unit electrically connected to the USB unit;
A control unit electrically connected to the charging unit;
A power storage unit electrically connected to the charging unit;
A voltage detection unit electrically connected to the power storage unit and the control unit;
A switch unit electrically connected to the power storage unit;
A motor unit electrically connected to the switch unit,
The voltage detection unit is used to detect the voltage of the power storage unit and notify the control unit, and when the voltage of the power storage unit is less than a first critical voltage value, the control unit detects the charging unit. Controlling and charging the power storage unit with a first constant small current until the voltage of the power storage unit exceeds the first critical voltage value,
When the voltage of the power storage unit exceeds the first critical voltage value, the control unit controls the charging unit until the voltage of the power storage unit becomes equal to or higher than the second critical voltage value by a constant current. Charge the storage unit,
When the voltage of the power storage unit is equal to or higher than the second critical voltage value, the control unit controls the charging unit, charges the power storage unit with a constant voltage, and the current charged in the power storage unit is When the second constant small current is reached, charging is stopped,
After the power storage unit is fully charged, when the transient voltage of the power storage unit falls below a third critical voltage value, the control unit controls the charging unit, performs floating charging on the power storage unit, and When the current charged in the power storage unit becomes a third constant small current and the transient voltage of the power storage unit exceeds the third critical voltage value, the floating charge is stopped,
The second critical voltage value is greater than the first critical voltage value, the second critical voltage value is greater than the third critical voltage value, and the third critical voltage value is the first critical voltage value. The constant current is greater than the first constant small current, the constant current is greater than the second constant small current, and the constant current is greater than the third constant small current. A power tool that is large.   The power tool according to claim 1, further comprising a charge instruction unit electrically connected to the control unit.   The charging instruction unit has a two-color LED, the two-color LED is electrically connected to the control unit, the two-color LED has red and green, and the power storage unit is charged The control unit controls the two-color LED to emit red light, and when the power storage unit is not charged, the control unit controls the two-color LED to emit green light. The electric tool as described in.   The first critical voltage value is 2.5 volts, the second critical voltage value is 3.6 volts, the third critical voltage value is 3.3 volts, and the first critical voltage value is 3.3 volts. The constant small current of 1 is 100 milliamperes, the second constant small current is 100 milliamperes, the third constant small current is 100 milliamperes, and the constant current is 1000 mA of current limit. The power tool according to claim 3, wherein the power tool is provided.   The power tool according to claim 4, wherein the USB unit is a micro USB, and the charging unit is a charging circuit.   The power tool according to claim 5, wherein the control unit is a microprocessor or a microcontroller.   The electric power tool according to claim 6, wherein the power storage unit is a rechargeable lithium battery.   The power tool according to claim 7, wherein the voltage detection unit is a voltage detection circuit or a voltage detector.   The switch unit is a power switch, and is used to control the power storage unit and supply power to the motor unit. When the switch unit is in a conductive state, the power storage unit is connected to the motor unit. The electric power tool according to claim 8, wherein when the switch unit is in a cut-off state, the power storage unit does not supply power to the motor unit.   The electric tool according to claim 9, wherein the motor unit is an electric tool motor.

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