Field programmable three-phase AC motor soft-start solid-state controller

Abstract

The invention discloses a field programmable three-phase AC motor soft start solid state controller, which comprises a microcontroller, a pulse width modulation circuit, a bias circuit connected with the microcontroller, a control circuit, a phase failure phase sequence detection circuit, an integrated trigger circuit, a zero-crossing trigger isolation circuit, a state output circuit connected with the phase failure phase sequence detection circuit, a synchronous circuit, a random trigger isolation circuit and an output circuit. The zero-crossing trigger isolation circuit is connected in parallel with the random trigger isolation circuit. Through combination of the PIC single-chip microcomputer and the integrated trigger chip TC787AP and the open-phase protection and phase sequence detection chip TC783, change of output power device silicon controlled conduction angle is realized, and the purposes of motor soft start and soft stop are achieved; the control circuit and program are simple and low in cost; and the isolation circuit adopts random conduction light coupling and zero-crossing conduction light coupling simultaneously, thereby effectively preventing fluctuation of load voltage, and realizing stability and reliability of load operation.

Description

technical field [0001] The invention relates to the field of motor soft-start controllers, in particular to a field-programmable solid-state controller for soft-start three-phase AC motors. Background technique [0002] With the continuous development of social economy, motors as important actuators are more and more widely used, especially three-phase asynchronous motors, as the most widely used motors, accounting for about 70% of the total number of motors, but three-phase AC asynchronous motors Problems such as large starting current and large impact on the power grid during starting cannot be ignored. Therefore, intelligent control requirements have been put forward for the three-phase AC motor controller, requiring intelligent functions such as soft start, soft stop, and fault detection. There are many ways to start three-phase AC motors. In recent years, power electronic soft-start controllers have been widely used. Embedded single-chip microcomputer programs are used...

AI Technical Summary

Problems solved by technology

There are many ways to start three-phase AC motors. In recent years, power electronic soft-start controllers have been widely used. Embedded single-chip microcomputer programs are used to control the start-up process of motors. The degree of intelligence is high, but the circuits and programs are complex and maintenance costs are high. high

Therefore, simply adopting the single-chip microcomputer mode, the hardware and software circuits are complicated, the cost is high, and the stability is poor.

Images