Method and apparatus for charging a bootstrap charge storage device

摘要

A charging circuit for at least one bootstrap charge storage element within an inertial load driver circuit is described, the at least one bootstrap charge storage element comprising a first node operably coupled to an output node of at least one switching element of the inertial load driver circuit. The charging circuit comprises at least one current source controllable to provide a current to a second node of the at least one bootstrap charge storage element, and at least one detection component arranged to receive at a first input thereof an indication of a voltage level at the output node of the at least one switching element of the inertial load driver circuit, detect when the voltage level at the output node of the switching element of the inertial load driver circuit is below a negative threshold voltage level, and control the at least one current source to provide a current to the second node of the at least one bootstrap charge storage element when the voltage level at the output node of the switching element of the inertial load driver circuit is below the negative threshold voltage level.

主权项

1. A charging circuit for at least one bootstrap charge storage element within an inertial load driver circuit, the at least one bootstrap charge storage element comprising a first node operably coupled to an output node of at least one switching element of the inertial load driver circuit; the charging circuit comprising:
at least one current source controllable to provide a current to a second node of the at least one bootstrap charge storage element; and at least one detection component arranged to:
receive at a first input thereof an indication of a voltage level at the output node of the at least one switching element of the inertial load driver circuit;detect if the voltage level at the output node of the switching element of the inertial load driver circuit is below a negative threshold voltage level; andcontrol the at least one current source to provide a current to the second node of the at least one bootstrap charge storage element if the voltage level at the output node of the switching element of the inertial load driver circuit is below the negative threshold voltage level.