CN201887705U

CN201887705U - Intelligent solid soft starting device based on DSP controller

Info

Publication number: CN201887705U
Application number: CN2010206793771U
Authority: CN
Inventors: 刘青松; 孙玉鸿
Original assignee: ZHUIRI ELECTRICAL CO Ltd SHANGHAI
Current assignee: ZHUIRI ELECTRICAL CO Ltd SHANGHAI
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2011-06-29
Anticipated expiration: 2020-12-24

Abstract

The utility model provides an intelligent solid soft starting device based on a DSP controller, and relates to a low-voltage solid soft starter which is based on the DSP controller and used for controlling the starting process of a three-phase asynchronous motor, aiming at solving the problem that an ordinary singlechip-controlled solid soft starting device can not meet the starting performance requirement due to unsmooth starting process or overhigh starting current in the starting process. A thyristor circuit is respectively connected with the three-phase asynchronous motor, a drive circuit and a follow current angle sampling circuit; the thyristor circuit is also connected with a current detection circuit through a current transformer; a DSP control circuit is respectively connected with the drive circuit, the follow current angle sampling circuit, a display and keyboard circuit, a power circuit and an RS 485 interface circuit; and the current detection circuit as well as a voltage detecting and zero-crossing capture circuit are connected with the DSP control circuit. The intelligent solid soft starting device based on the DSP controller is mainly used for the starting, stopping, running and protecting of the three-phase AC asynchronous motor.

Description

A kind of intelligent solid-state soft starter based on dsp controller

Technical field

The utility model relates to a kind of motor starter, particularly relates to a kind of intelligent solid-state soft starter that the threephase asynchronous starting process is controlled based on dsp controller.

Background technology

Produce impulse current during the motor across-the-line starting, not only electrical network is caused harmful effect, and seriously influence the useful life of motor times over rated current.For improving the starting characteristic of motor, the low pressure solid-state soft starters that adopt more, and 16 single-chip microcomputers of the many employings of the kernel control chip of present low pressure solid-state soft starter both domestic and external, by the electric current that samples in the motor starting procedure is analyzed, and silicon controlled trigger angle in the major loop is controlled by certain algorithm.This mode can satisfy soft starter in starting process substantially, and electric current is restricted in a certain scope.But because the processing speed of single-chip microcomputer own is slow, and for the ability shortcoming of finishing complicated calculations, resource-constrained is difficult to carry out intelligentized updating, therefore, this solid-state soft starter is when motor starting, starting current is excessive or starting process is unsmooth, can not satisfy the requirement of starting performance fully.

Summary of the invention

Excessive in order to overcome common monolithic processor controlled low pressure solid-state soft starter starting current in starting process, perhaps starting process is unsmooth and can not satisfy the starting performance requirement fully, can not carry out problems such as intelligentized updating, the utility model provides a kind of starting process level and smooth, and starting current is little and do not have an intelligent solid-state soft starter based on dsp controller that secondary current impacts.

The technical scheme that its technical problem that solves the utility model adopts is: it is by voltage detecting and zero passage capture circuit, thyristor circuit, drive circuit, afterflow angle sampling circuit, the DSP control circuit, current detection circuit, show and keyboard circuit, power circuit and RS485 interface circuit constitute, described thyristor circuit connects with threephase asynchronous, thyristor circuit connects with drive circuit and afterflow angle sampling circuit respectively, and thyristor circuit connects by current transformer and current detection circuit, described DSP control circuit respectively with drive circuit, afterflow angle sampling circuit, show and keyboard circuit, power circuit and RS485 interface circuit link, described current detection circuit, voltage detecting and zero passage capture circuit and DSP control circuit link.

Further, described thyristor circuit by six totally three groups of thyristors be formed in parallel, two thyristor parallel connected in reverse phase in every group, perhaps thyristor circuit is formed in parallel by three bidirectional triode thyristors.

The beneficial effects of the utility model are: utilize thyristor chopping depressuring principle, control is added in the terminal voltage on the threephase asynchronous, realize the soft-start by lowering voltage and the soft stop of motor, the starting current that reduces motor significantly is to the impact to plant equipment of the impact of electrical network and load inertia.The DSP control circuit is the core of The whole control system, by the collection of DSP to various signals, handle according to the data that collect, and control according to the result who handles, the thyristor trigger impulse of DSP control circuit output triggers the thyristor conducting through isolating the amplification back.In addition, the DSP control circuit is undertaken communication and intellectuality to various data and result by RS485 hardware interface and display keyboard circuit are long-range.With DSP is the motor soft starter of core, and processing speed is fast, can in time follow the variation of motor load, makes electric motor starting steadily reliable, the utlity model has good smooth starting characteristic, and starting current is low, and no secondary current impacts, and compact conformation.In addition, it has starting, the hold function of plurality of optional, reaches additional functions such as fault detect, system protection.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model:

1-voltage detecting and zero passage capture circuit 2-thyristor circuit 3-current detection circuit

4-drive circuit 5-afterflow angle sampling circuit 6-DSP control circuit

7-shows and keyboard circuit 8-power circuit 9-RS485 interface circuit.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing 1 and embodiment.

In conjunction with Fig. 1 a kind of intelligent solid-state soft starter based on dsp controller of the present utility model is described, it is by voltage detecting and zero passage capture circuit 1, thyristor circuit 2, drive circuit 4, afterflow angle sampling circuit 5, DSP control circuit 6, current detection circuit 3, show and keyboard circuit 7, power circuit 8 and RS485 interface circuit 9 constitute, thyristor circuit 2 connects with threephase asynchronous, thyristor circuit 2 connects with drive circuit 4 and afterflow angle sampling circuit 5 respectively, and thyristor circuit connects by current transformer and current detection circuit 3, DSP control circuit 6 respectively with drive circuit 4, afterflow angle sampling circuit 5, show and keyboard circuit 7, power circuit 8 and RS485 interface circuit 9 link, current detection circuit 3, voltage detecting and zero passage capture circuit 1 link with DSP control circuit 6.Thyristor circuit 2 by six totally three groups of thyristors be formed in parallel, two thyristor parallel connected in reverse phase in every group, every group of thyristor is fixed in the radiator that fin and following fin constitute on the integral type, perhaps three bidirectional triode thyristor modules of thyristor circuit 2 employings parallel connection.

Voltage detecting and zero passage capture circuit 1 be on the one hand with the size of supply voltage, sends into the AD passage of DSP through the intermediate conversion circuit, as the foundation of fault detect, overvoltage and under-voltage protection, voltage demonstration etc.; On the other hand, changing the aanalogvoltage of power supply into square-wave signal, is that voltage zero-cross detects the loop voltage zero-cross is caught as the synchronizing signal that triggers three-phase thyristor.3 pairs of load currents of current detection circuit are sampled, and DSP control circuit 6 is responsible for functions such as input, real-time operation and output control as the master cpu of whole system.Sample in sampling circuit 5 pairs of afterflow angles in afterflow angle, with the zero cross signal that captures is benchmark, according to control strategy, different controlling object is controlled as required, and this is controlled the result pass through the thyristor circuit 2 that drive circuit 4 drives in the major loops, thereby reach the result of motor smooth starting.Can select the start mode of solid-state soft starter by keyboard, display accurately shows the current of electric size, and S485 interface circuit 9 can make solid-state soft starter telecommunication control.

Claims

1. intelligent solid-state soft starter based on dsp controller, it is characterized in that: it is by voltage detecting and zero passage capture circuit (1), thyristor circuit (2), drive circuit (4), afterflow angle sampling circuit (5), DSP control circuit (6), current detection circuit (3), show and keyboard circuit (7), power circuit (8) and RS485 interface circuit (9) constitute, described thyristor circuit (2) connects with threephase asynchronous, thyristor circuit (2) connects with drive circuit (4) and afterflow angle sampling circuit (5) respectively, and thyristor circuit connects by current transformer and current detection circuit (3), described DSP control circuit (6) respectively with drive circuit (4), afterflow angle sampling circuit (5), show and keyboard circuit (7), power circuit (8) and RS485 interface circuit (9) link, described current detection circuit (3), voltage detecting and zero passage capture circuit (1) link with DSP control circuit (6).

2. according to the described a kind of intelligent solid-state soft starter of claim 1 based on dsp controller, it is characterized in that: described thyristor circuit (2) by six totally three groups of thyristors be formed in parallel, two thyristor parallel connected in reverse phase in every group, perhaps thyristor circuit (2) is formed in parallel by three bidirectional triode thyristors.