Frequency conversion power source based on digital signal processor controlling

Abstract

The invention relates to a variable-frequency power source based on the control of a digital signal processor, which comprises a switch power source module, a control circuit, a circuit for isolating and shaping pulse-width modulating signal, IPM inverting circuits, a circuit for detecting and protecting busbar voltage, a rectification input slow-start circuit, a communication circuit, an interface circuit for isolating and inputting parallel signals and an human-computer interface circuit for displaying the key. The invention adopts the structure of a single digital signal processor (DSP) coupled with the double IPM inverting circuits, provides two paths of independent variable-frequency power sources for two sets of asynchronous motors at the same time and carries out independent speed regulations to the two sets of asynchronous motors. The variable-frequency power source of the invention has the advantages of small volume, low power consumption, high reliability and being convenient for bulk production, etc., and adopts an appropriate switch frequency and an advanced voltage space vector pulse width modulation algorithm (SVPWM), thereby lowering the noise during the operation of the asynchronous motors and increasing the voltage utilization rate, with obvious effect on energy saving.

Description

technical field [0001] The invention relates to a variable frequency power supply, in particular to a variable frequency power supply controlled by a digital signal processor. Background technique [0002] The weft feeder is a special device for storing weft yarns on the shuttleless loom. Most of them are driven by asynchronous motors. According to the technological characteristics of the double-jet weft feeder, its frequency conversion power supply must meet the following technical requirements: it can independently adjust the speed of two asynchronous motors at the same time; The speed up and down time of the asynchronous motor can be controlled by the switch value; small size, low power consumption; low noise, good energy saving effect; high reliability; low cost, suitable for mass production. [0003] There are the following disadvantages in using a general-purpose frequency converter as the variable frequency power supply of the weft feeder: [0004] 1. Although each i...

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Problems solved by technology

[0011] In order to solve the problem that the special frequency converter for the weft feeder in the prior art cannot independently adjust the speed of each asynchronous motor, and each asynchronous motor can only work at the same speed; the speed up and down time of the asynchronous motor cannot be controlled by the switch value; The frequency converter dedicated to the weft machine is small in size and low in cost, and has high noise, poor stability and reliability; if it is necessary to independently adjust the speed of two asynchronous motors at the same time, a series of problems such as increased cost and low reliability, for this reason, the present invention The purpose is to provide a larger program storage space and rich peripheral resources, only a small number of peripheral circuits, simplify the design of the drive circuit, reduce the size of the circuit, and realize the design of fast and reliable protection. For this reason, the present invention provides a Frequency conversion power supply based on digital signal processor control

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