Semi-symmetric switching

A controller for controlling a driver circuit driving a brushless motor in a power tool,

• the driver circuit being coupled to a direct current, DC, power source and including a first switching element pair coupled to a first phase winding of the brushless motor and a second switching element pair coupled to a second phase winding of the brushless motor;
• and
• the controller being arranged to alternately switch a first switching element of the first switching element pair and a second switching element of the second switching element pair, wherein the first switching element and the second switching elements are coupled to a respective terminal of the DC power source.

-20. (canceled)

A method of controlling a driver circuit driving a brushless motor in a power tool, wherein the driver circuit is coupled to a direct current, DC, power source and includes a first switching element pair coupled to a first phase winding of the brushless motor and a second switching element pair coupled to a second phase winding of the brushless motor,

• the method comprising alternately switching a first switching element of the first switching element pair and a second switching element of the second switching element pair, wherein the first switching element and the second switching elements are coupled to a respective terminal of the DC power source.

-23. (canceled)