Micro-stepping low-noise stepping motor drive controller

Abstract

The invention discloses a micro-stepping low-noise stepping motor driving controller which comprises a delayer and a rotation counter, wherein the rotation counter is connected to a stepping motor via a micro-stepping subdivision sin / cos generator module, a pulse width modulation (PWM) generator module and an H-bridge driver, an input end of a stepping motor setting control register is connected with an external device through a serial peripheral interface (SPI) serial bus, an output end of the stepping motor setting control register is used for outputting data information or a control signal to the delayer, the rotation counter, the micro-stepping subdivision sin / cos generator module, the PWM generator module and the H-bridge driver, the micro-stepping subdivision sin / cos generator module comprises a subdivision logic controller, a Sin accumulator, a Cos accumulator and a subdivision frequency divider, and the PWM generator module comprises a delay counter, a Sin-PWM modulator, a Cos-PWM modulator and a PWM frequency divider. The micro-stepping low-noise stepping motor driving controller has a constant-voltage working structure with 256 subdivision stepping and adjustable amplitude, phase and frequency, and thus, the advantages of low vibration, low video frequency noise, low heat and high conversion efficiency during the working of the motor are achieved.

Description

technical field [0001] The invention relates to a stepping motor drive controller. The stepping motor can be used in driving video lenses such as cameras and video cameras, and can also be used in other motor fields, such as unmanned aerial vehicle control platform, small printers and the like. Background technique [0002] In the prior art, the control method of the stepper motor basically adopts the constant current mode. The basic principle is that the current of the switch tube and the motor passes through the sampling resistor to obtain a sampling voltage, and the sampling voltage is fed back to the comparator for comparison with the reference voltage. When the current is too large, the comparator turns over, and the output switch is turned off. At this time, the output current decays. After a fixed decay time, the output switch is turned on again, and the current increases until the comparator turns over. The chip keeps turning on and off the switch tube to form a PWM ...

AI Technical Summary

Problems solved by technology

By changing the reference voltage of the comparator, the current change can be controlled; and in the prior art, the maximum step subdivision is at most 32 subdivisions; the disadvantage of this circuit is that it generates heat significantly, the noise caused by vibration is large, and the step accuracy not tall

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