Back to results
US 11,777,377 B2Granted
Electric working machine with semiconductor element that completes or interrupts current path to motor
AssigneeMakita Corporation
InventorAkihiro Nakamoto
Life of this patent
Estimating the term…
Abstract
An electric working machine includes: a motor; a semiconductor element that is provided in a current path to the motor and completes or interrupts the current path; a circuit board on which the semiconductor element is mounted, a control circuit that turns on and off the semiconductor element to control energization to the motor being assembled to the circuit board; and a heat sink for dissipating heat from the semiconductor element. The semiconductor element is attached to the heat sink via a metal-based board.
Claims10
An electric working machine comprising:
- a motor;
- a battery;
- a drive circuit for driving the motor, the drive circuit including an inverter circuit that controls electric current flowing through a phase winding of the motor;
- a first semiconductor switch provided in a power-supply line from the battery to the drive circuit;
- a control circuit that controls electric current supplied from the battery to the motor via the drive circuit;
- a second semiconductor switch of the inverter circuit coupled to a terminal of the motor;
- a heat sink made of a conductive metal and to which the first semiconductor switch and the second semiconductor switch are attached;
- and
- a metal-based board that is a printed circuit board and is disposed between the first semiconductor switch and the heat sink, and between the second semiconductor switch and the heat sink, the metal-based board having:
- a board surface;
- and
- an insulating layer stacked on the board surface,
- a wiring pattern provided on the insulating layer,
- wherein the first semiconductor switch and the second semiconductor switch are fixed on the insulating layer to be attached to the heat sink via the metal-based board.
11 more elements
An electric working machine comprising:
- a motor;
- a semiconductor element that is provided in a current path to the motor and completes or interrupts the current path;
- a circuit board on which the semiconductor element is mounted, a control circuit that turns on and off the semiconductor element to control energization to the motor being disposed on the circuit board;
- a heat sink made of a conductive metal for dissipating heat from the semiconductor element;
- and
- a metal-based board that is a printed circuit board, the metal-based board having:
- a board surface;
- and
- an insulating layer stacked on the board surface,
- a wiring pattern provided on the insulating layer,
- wherein the semiconductor element is fixed on the insulating layer and attached to the heat sink via the metal-based board.
8 more elements
Dependencies are inferred from the claim text.