Ultrasonic motor full-bridge drive circuit based on double inductors and double capacitors

Abstract

The invention relates to an ultrasonic motor full-bridge driving circuit based on dual capacitors and dual inductors, which comprises a DSP (digital signal processor) controller, a driving chip, a full-bridge voltage conversion unit, a first phase dual-inductor dual-capacitor driving unit and a second phase dual-inductor dual-capacitor driving unit; the DSP controller is connected with the input end of the driving chip of which a first output end is connected with the control end of the first phase dual-inductor dual-capacitor driving unit, a second output end of the driving chip is connected with the control end of the second phase dual-inductor dual-capacitor driving unit, and a third output end of the driving chip is connected with the control end of the full-bridge voltage conversion unit of which the output end is connected with the input end of the first phase dual-inductor dual-capacitor driving unit and the input end of the second phase dual-inductor dual-capacitor driving unit. The ultrasonic motor full-bridge driving circuit based on dual capacitors and dual inductors is compact and simple in structure, can be integrated with a control system according to the requirements of a driving circuit, is easy in speed adjusting, is stable in a low-speed area without pulse and can be further miniaturized.

Description

technical field [0001] The invention relates to a driving circuit of an ironless motor, in particular to a full-bridge driving circuit of an ultrasonic motor based on double inductors and double capacitors. Background technique [0002] Most of the existing ultrasonic motor drive circuits use series or parallel resonant circuits, and their resonant frequency is basically close to the resonant frequency of the motor. When the motor is running, the quality factor of its two-phase drive circuit will change, which will cause the input voltage of the motor to change, causing the speed of the motor to fluctuate. When the driving frequency is closer to the resonant frequency, the voltage gain of the driving circuit will change more obviously with the quality factor, so it is difficult for the motor to obtain better dynamic performance during operation. [0003] Use a full-bridge circuit based on double inductors and double capacitors (LLCC) to drive the ultrasonic motor. This circ...

AI Technical Summary

Problems solved by technology

When the motor is running, the quality factor of its two-phase drive circuit will change, which will cause the input voltage of the motor to change, causing the speed of the motor to fluctuate

When the driving frequency is closer to the resonance frequency, the voltage gain of the driving circuit will change more obviously with the quality factor, so it is difficult for the motor to obtain better dynamic performance during operation

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