CN201878030U

CN201878030U - Three-phase fully controlled bridge rectifying device controlled by single chip microcomputer

Info

Publication number: CN201878030U
Application number: CN2010206070912U
Authority: CN
Inventors: 张祖贵
Original assignee: WUHAN CHANGJIANG RIVER CONTROL EQUIPMENT RESEARCH INSTITUTE
Current assignee: WUHAN CHANGJIANG RIVER CONTROL EQUIPMENT RESEARCH INSTITUTE
Priority date: 2010-11-11
Filing date: 2010-11-11
Publication date: 2011-06-22
Anticipated expiration: 2020-11-11

Abstract

The utility model provides a three-phase fully controlled bridge rectifying device controlled by a single chip microcomputer. The rectifying device comprises a three-phase fully controlled bridge rectifying main loop, a three-phase synchronous transformer, a pulse control circuit and a pulse output circuit, wherein the pulse control circuit sequentially comprises a phase voltage zero crossing point shaping circuit of synchronizing signals, a synchronizing pulse signal controller and a pulse amplification circuit. The rectifying device is characterized in that the three-phase synchronous transformer adopts star connection; the three-phase synchronous transformer TB is connected with the pulse control circuit; the pulse control circuit sequentially comprises the phase voltage zero crossing point shaping circuit of synchronizing signals, the synchronizing pulse signal controller, the pulse amplification circuit and a pulse transformer TM. The synchronizing pulse signal controller adopts the single chip microcomputer, and the synchronization point adopts the zero crossing point of phase voltage. The single chip microcomputer comprises a synchronizing signal acquisition module and a transmission control module formed by triggering pulse, and the pulse triggering transmission point of the transmission control module formed triggering pulse is the zero crossing point plus 30 degrees of phase voltage.

Description

Monolithic processor controlled three-phase full-controlled bridge rectifying device

Technical field

The utility model relates to a kind of monolithic processor controlled three-phase full-controlled bridge rectifying device, belongs to the generator excitation technical field.

Background technology

Synchronous generator excitation equipment is not talked if bypass its adjusting model, can regard the controlled DC power supply of a cover output voltage as, and its core technology is the three-phase full-controlled bridge commutation technique.

Three-phase fully-controlled bridge rectification circuit commonly used, rectifier bridge is made up of SCR1, SCR2, SCR3, SCR4, SCR5 and six controllable silicons of SCR6, and SCR1 is the positive mutually brachium pontis of A, SCR3 is the positive mutually brachium pontis of B, and SCR5 is the positive mutually brachium pontis of C, and SCR4 is the negative mutually brachium pontis of A, SCR6 is the negative mutually brachium pontis of B, and SCR2 is the negative mutually brachium pontis of C.

The high point of forward voltage according to the order of ABC, is changed between three positive brachium pontis successively, the low spot of negative voltage according to the order of ABC, is changed between three negative brachium pontis equally successively, this transfer point is exactly the starting point that controllable silicon on the brachium pontis possesses conducting external condition, is called synchronous points.The order of six silicon controlled synchronous points arrival is respectively SCR1, SCR2, SCR3, SCR4, SCR5 and SCR6, and is identical with the silicon controlled code name.Synchronous points is the datum mark that controllable silicon triggers, can not make mistakes, otherwise the rectifier bridge cisco unity malfunction.

Synchronous signal acquisition circuit by delta connection commonly used, when the three-phase alternating current of controllable silicon anode input was positive phase sequence, this circuit had been finished the acquisition tasks of synchronizing signal well, can obtain synchronous points.If the three-phase alternating current of input is a negative-phase sequence, error of principle has then appearred.More leading 60 ° than correct synchronous points, what consequently 15 ° trigger impulse obtained is the inversion operating mode, and 135 ° what obtain is the rectification operating mode, and excitation system can't operate as normal.Must check phase sequence before new excitation unit puts into operation, also must not change in moving and safeguarding.

Because the controllable silicon anode voltage is lower before the generator excitation, common phase-sequence meter can't detect, and also lacks the phase-sequence meter of special-purpose survey residual voltage on the market, and the phase sequence check becomes a big difficult point of excitation system commissioning test.

Summary of the invention

The purpose of this utility model is a kind of monolithic processor controlled three-phase full-controlled bridge rectifying device of development, and when the phase sequence of anode three phase mains changed, three-phase full-controlled bridge still can operate as normal.

The technical solution of the utility model: monolithic processor controlled three-phase full-controlled bridge rectifying device of the present utility model comprise three-phase full-controlled bridge rectification major loop, three-phase synchrotrans, pulse control circuit and and impulse output circuit, pulse control circuit comprises phase voltage zero crossing shaping circuit, synchronization pulse controller, the pulse amplifying circuit of synchronizing signal successively; It is characterized in that: the three-phase synchrotrans adopt Y-connection; Three-phase synchrotrans TB is connected with pulse control circuit, and pulse control circuit comprises phase voltage zero crossing shaping circuit, synchronization pulse controller, pulse amplifying circuit and the pulse transformer TM of synchronizing signal successively; Its synchronization pulse controller adopts single-chip microcomputer, and synchronous points adopts the zero crossing of phase voltage.

Described single-chip microcomputer comprises that synchronous signal acquisition module and trigger impulse form and sends control module, and trigger impulse forms the trigger impulse that sends control module and sends point and be the zero crossing of phase voltage+30 °.

Advantage of the present utility model: when controllable silicon anode phase sequence was put upside down, the three-phase controllable silicon rectifier bridge still can operate as normal.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is that the single-chip microcomputer lock-out pulse sends control flow chart.

Fig. 3 is a positive phase sequence three phase rectifier waveform.

Fig. 4 is a negative-phase sequence three phase rectifier waveform.

Embodiment

Fig. 1 is circuit theory diagrams of the present utility model: the utility model comprises that three-phase alternating current A, B, C are connected to the three-phase full-controlled bridge rectification major loop of being made up of six controllable silicon SCR1, SCR2, SCR3, SCR4, SCR5 and SCR6, and R represents load resistance; Three-phase synchrotrans TB adopts Y-connection; Three-phase synchrotrans TB is connected with pulse control circuit, and pulse control circuit comprises phase voltage zero crossing shaping circuit, synchronization pulse controller, pulse amplifying circuit and the pulse transformer TM of synchronizing signal successively; Its synchronization pulse controller adopts single-chip microcomputer, and synchronous points adopts the zero crossing of phase voltage.

Described single-chip microcomputer comprises that synchronous signal acquisition module and trigger impulse form and sends control module, and synchronizing signal is the zero crossing of phase voltage, and trigger impulse forms the trigger impulse that sends control module, and to send point be that zero crossing with phase voltage adds 30 °.

Single-chip microcomputer adopts the 80C196 single-chip microcomputer, because have HSO (high speed follower) function, sends out six tunnel pulses and is very easy to realize, has obtained in the silicon controlled toggle field to use widely.

Fig. 2 is that the single-chip microcomputer lock-out pulse sends control flow chart:

The zero crossing of getting phase voltage is a synchronous points, and this moment, pilot angle was zero, adds 30 ° and is trigger impulse transmission point.

Fig. 3 is a positive phase sequence three phase rectifier waveform, Fig. 4 is a negative-phase sequence three phase rectifier waveform: find out among the figure: because three-phase synchrotrans TB adopts Y-connection, the zero crossing that has adopted phase voltage is as synchronous points, no matter the anode three phase mains is positive phase sequence or negative-phase sequence, 30 ° of all leading actual synchronous triggering points of this point, like this, make that when controllable silicon anode phase sequence was put upside down, the three-phase controllable silicon rectifier bridge still can operate as normal.

Claims

1. monolithic processor controlled three-phase full-controlled bridge rectifying device, comprise three-phase full-controlled bridge rectification major loop, three-phase synchrotrans, pulse control circuit and and impulse output circuit, pulse control circuit comprises phase voltage zero crossing shaping circuit, synchronization pulse controller, the pulse amplifying circuit of synchronizing signal successively; It is characterized in that: the three-phase synchrotrans adopt Y-connection; Three-phase synchrotrans TB is connected with pulse control circuit, and pulse control circuit comprises phase voltage zero crossing shaping circuit, synchronization pulse controller, pulse amplifying circuit and the pulse transformer TM of synchronizing signal successively; Its synchronization pulse controller adopts single-chip microcomputer, and synchronous points adopts the zero crossing of phase voltage, and trigger impulse sends point and is the zero crossing of phase voltage+30 °.

2. monolithic processor controlled three-phase full-controlled bridge rectifying device according to claim 1, it is characterized in that: single-chip microcomputer comprises that synchronous signal acquisition module and trigger impulse form and sends control module, and trigger impulse forms the trigger impulse that sends control module and sends point and be the zero crossing of phase voltage+30 °.