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Improved current sensing and regulation for stepper motor drivers

A technology for current sensing, motor power, applied in the field of high-side terminal, integrated circuit embodiments

Pending Publication Date: 2022-05-13
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many aspects of current regulation are well understood, problematic areas of control remain

Method used

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  • Improved current sensing and regulation for stepper motor drivers
  • Improved current sensing and regulation for stepper motor drivers
  • Improved current sensing and regulation for stepper motor drivers

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Experimental program
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Embodiment Construction

[0029] Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following detailed description of the embodiments of the present invention, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well known features have not been described in detail to avoid unnecessarily complicating the description.

[0030] Stepper Motor Operation

[0031] A stepper motor typically has two coils, the inductor, arranged at a 90-degree angle between the coils. For smooth operation, the current through each coil needs to have a 90 degree phase separation in order to generate a rotating magnetic field for the rotor to follow. Although a square wave or a sine wave can be used to regulate the current in the coil, curre...

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Abstract

An integrated circuit (100A) includes an H-bridge circuit (102) having a first output node (OUT1) for coupling to a high side terminal of an inductor (103) and a second output node (OUT2) for coupling to a low side terminal of the inductor. A current sense FET (SNS-DRV) is coupled between a current source (110) and a lower supply voltage to provide a reference current (Itrip) that includes a peak current limit at a sense node. A current sense comparator (104) has a first input coupled to the sense node, a second input coupled to the second output node, and an output (113) coupled to send an output signal to the driver control circuit. A FET linear detection circuit (112) is coupled to receive a gate voltage (LS2) of the active low-side power FET (Mls2) and has an output (CMP EN) coupled to enable the current sense comparator when the active low-side power FET operates in the linear region.

Description

Background technique [0001] In a stepper motor, motor position is controlled by regulating current in two or more motor windings. Different stepper motor designs can have different numbers of windings, with the current waveform in each winding leading or lagging the current waveform associated with the other windings. Although many aspects of current regulation are well understood, problematic areas of control remain. Contents of the invention [0002] The disclosed embodiments provide a FET linearity detection circuit that tracks the gate voltage on an active low-side power FET to determine when to turn off blanking and enable a current sense comparator. The current sense comparator can be enabled when the active low-side power FET is in the linear region. In one embodiment, the current sense comparator is enabled when the voltage on the gate of the active low side power FET is greater than a threshold voltage below the digital upper supply voltage. [0003] In one aspec...

Claims

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Application Information

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IPC IPC(8): H02P8/12
CPCH02P7/04H02P8/22H02P8/12H02P29/024H03K2217/0072H03K2217/0063H03K17/6871G01R1/20G01R19/0092G01R19/16547G01R19/16519H03K5/24H03M1/001H03K3/3565H03K17/687
Inventor G·S·克里斯穆蒂V·N·科提克拉普迪
Owner TEXAS INSTR INC