Soft-start circuit
AssigneeGlobal Mixed-mode Technology Inc.
InventorChien-Lun Chu
Life of this patent
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Abstract
A soft-start circuit which can be applied to a motor controller is provided. The soft-start circuit comprises a controller, a counting unit, a digital-to-analog converter, a current detecting unit, and a comparator. The soft-start circuit uses a plurality of current limit values so as to achieve a maximum output power and prevent damage to a motor coil.
Claims17
A soft-start circuit which is applied to a motor controller, wherein the motor controller comprises a switch circuit and a pre-driver for supplying a driving current to a motor coil, the motor coil has a first terminal and a second terminal, and the soft-start circuit comprises:
- a current detecting unit, coupled to the switch circuit for detecting the driving current;
- and
- a controller, coupled to a control signal for generating a pulse width modulation signal to the pre-driver, wherein the pulse width modulation signal has a duty ratio and the soft-start circuit changes the duty ratio based on a plurality of current limit values.
Dependencies are inferred from the claim text.