Electric motor power control circuitry
AssigneeTexas Instruments Incorporated
InventorsMichael Edwin Butenhoff, Rakesh Raja, Nicholas James Oborny
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Abstract
Enhanced motor power control circuitry is presented herein. In one implementation, a circuit includes power transistor elements in a half-bridge arrangement configured to selectively switch current for a phase of a motor according to control signals applied to corresponding gate terminals. The circuit also includes control circuitry configured to produce the control signals to achieve target states among the power transistor elements. The control signals have ramp rates determined based at least on polarities of the current through the power transistor elements during inactive states.
Claims12
A motor control circuit, comprising:
- metal oxide semiconductor field-effect transistor (MOSFET) elements in a half-bridge arrangement having an output wherein the output is configured to switch current at an output terminal for a phase of a motor according to control voltages supplied to gate terminals of the MOSFET elements;
- and
- a control system configured to produce the control voltages supplied to gate terminals of the MOSFET elements, the control voltages having ramp rates determined based at least on a comparison among past switching states of the MOSFET elements and target switching states of the MOSFET elements, wherein, the control circuitry configured to control switching states of the MOSFET elements by at least applying first ramp rates based on first voltage transitions to be handled across the MOSFET elements, and applying second ramp rates slower relative to the first ramp rates based on second voltage transitions higher than the first voltage transition to be handled across the MOSFET elements.
A motor control circuit, comprising:
- metal oxide semiconductor field-effect transistor (MOSFET) elements in a half-bridge arrangement, the MOSFET elements having gate terminals;
- and
- a control system configured to produce control voltages having ramp rates determined based at least on a comparison among past switching states of the MOSFET elements and target switching states of the MOSFET elements, wherein the control circuitry is configured to control switching states of the MOSFET elements by at least applying first ramp rates based on first voltage transitions to be handled across the MOSFET elements, and applying second ramp rates slower relative to the first ramp rates based on second voltage transitions higher than the first voltage transition to be handled across the MOSFET elements.
A motor control circuit, comprising:
- a control system configured to produce control voltages having ramp rates determined based at least on a comparison among past switching states of metal oxide semiconductor field-effect (MOSFET) transistors in a half-bridge arrangement and target switching states of the MOSFET transistors, wherein the control circuitry is configured to control switching states of the MOSFET transistors by at least applying first ramp rates based on first voltage transitions to be handled across the MOSFET transistors, and applying second ramp rates slower relative to the first ramp rates based on second voltage transitions higher than the first voltage transition to be handled across the MOSFET transistors.
Dependencies are inferred from the claim text.