Electronic switching module for a power tool
First Claim
1. A power tool comprising:
- a tool housing;
an electric motor inside the tool housing;
a power interface facilitating a connection to a power source;
at least four power components configured as an H-bridge to modulate a supply of power from the power interface to the electric motor, the power components being actively-controlled semiconductor switches;
a user-actuated input unit configured to output a first signal indicative of a desired power output level to the electric motor and a second signal indicative of a desired direction of current flow to the electric motor; and
a control unit configured to receive the first and second input signals from the user-actuated input unit and to control the supply of power to the electric motor using two of said power components with synchronous rectification for pulse-width modulation (PWM) of the supply of power based on the first signal, and to control the direction of current flow to the electric motor using the other two of said power components based on the second signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A power tool includes a tool housing, an electric motor inside the housing, and a power interface facilitating a connection to a power source. At least four actively-controlled power components are configured as an H-bridge to modulate a supply of power from the power interface to the electric motor. A user-actuated input unit outputs a first signal indicative of a desired power output level to the electric motor and a second signal indicative of a desired direction of current flow to the electric motor. A control unit controls the supply of power to the electric motor using two of said power components with synchronous rectification for pulse-width modulation (PWM) of the supply of power based on the first signal, and to control the direction of current flow to the electric motor using the other two of said power components based on the second signal.
-
Citations
15 Claims
-
1. A power tool comprising:
-
a tool housing; an electric motor inside the tool housing; a power interface facilitating a connection to a power source; at least four power components configured as an H-bridge to modulate a supply of power from the power interface to the electric motor, the power components being actively-controlled semiconductor switches; a user-actuated input unit configured to output a first signal indicative of a desired power output level to the electric motor and a second signal indicative of a desired direction of current flow to the electric motor; and a control unit configured to receive the first and second input signals from the user-actuated input unit and to control the supply of power to the electric motor using two of said power components with synchronous rectification for pulse-width modulation (PWM) of the supply of power based on the first signal, and to control the direction of current flow to the electric motor using the other two of said power components based on the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A power tool comprising:
-
a tool housing; an electric motor inside the tool housing; a power interface facilitating a connection to a power source; and at least four semiconductor switches configured as an H-bridge to supply power from the power source to the electric motor, the semiconductor switches mounted on a insulated metal substrate (IMS) board having a first metal substrate, a second metal layer on which the semiconductor switches are mounted, and a dielectric layer therebetween; and a control unit arranged on a control circuit board disposed at a distance from the IMS board, the control unit configured to control a switching operation of the four semiconductor switches, wherein the first metal substrate of the IMS board has a thermal capacity of at most 7 Joules/Kelvin and the power tool has a maximum watts out of at least 100 watts. - View Dependent Claims (11, 12, 13, 14, 15)
-
Specification