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US 9,337,763 B2Granted
Power tool system and power supply device
AssigneeHitachi Koki Co., Ltd.
InventorsKazuhiko Funabashi, Nobuhiro Takano, Yoshikazu Kawano, Yasushi Nakano, Yuki Horie, Shinji Watanabe, Miyoji Onose, Haruhisa Fujisawa
Life of this patent
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Abstract
A power tool system includes: a power tool including an AC motor; a portable battery pack; and a power supply device that converts a DC power supplied from the portable battery pack into an AC power to supply the AC power to the AC motor.
Claims24
A power tool system comprising:
- a power tool including an AC motor being controlled by AC power signal, and a trigger switch;
- a portable battery pack;
- and
- a power supply device including an inverter circuit that converts a DC power supplied from the portable battery pack into an AC power to supply the AC power to the AC motor, and a control circuitry that controls the inverter circuit to start converting the DC power when the trigger switch is turned on,
- wherein the control circuitry controls to start supplying to the AC motor a first AC power smaller than a target power when the trigger switch is turned on,
- wherein the control circuitry restricts the AC power supplied to the AC motor so that the AC power does not reach the target power until a predetermined time has elapsed since the trigger switch is turned on, and
- wherein the control circuitry controls the inverter circuit to increase the AC power supplied to the AC motor from the first AC power to the target power during the predetermined time, in spite of an amount of operation of the trigger switch while the trigger switch continues being turned on.
4 more elements
A power supply device connectable to a power tool including an AC motor being controlled by AC power signals, and a trigger switch, comprising:
- an inverter circuit that converts a DC power supplied from a portable battery pack into an AC power to supply the AC power to the AC motor;
- and
- a control circuitry that controls the inverter circuit to start converting the DC power supplied from the portable battery pack into the AC power when the trigger switch is turned on,
- wherein the control circuitry restricts the AC power supplied to the AC motor so that the AC power does not reach the target power until a predetermined time has elapsed since the trigger switch is turned on, and
- wherein the control circuitry controls the inverter circuit to increase the AC power supplied to the AC motor from the first AC power to the target power during the predetermined time, in spite of an amount of operation of the trigger switch while the trigger switch continues being turned on.
2 more elements
Dependencies are inferred from the claim text.