CN202949391U

CN202949391U - Phase change controller

Info

Publication number: CN202949391U
Application number: CN 201220663742
Authority: CN
Inventors: 鲁广斌; 关慧军
Original assignee: QIQIHAR QILIDA ELECTRIC CO Ltd
Current assignee: QIQIHAR QILIDA ELECTRIC CO Ltd
Priority date: 2012-12-05
Filing date: 2012-12-05
Publication date: 2013-05-22
Anticipated expiration: 2022-12-05

Abstract

The utility model provides a phase change controller. The controller comprises five thyristor modules, each thyristor is composed of two unidirectional thyristors through anti-parallel connection, the phase change controller is connected onto a power supply loop of a three-phase asynchronous motor in series and further comprises five sampling modules, and each sampling module is connected at two ends of one thyristor module in parallel and used for detecting voltages at two ends of the thyristor module which is in parallel connection with the sampling module. According to the phase change controller, whether thyristors are invalid is detected by the sampling modules, and detection of thyristors can be performed before the thyristors are triggered; when the thyristors are not broken down, a detection circuit outputs a low level switching value signal, and a thyristor trigger device outputs a trigger signal under the action of the low level signal; and when any one of the thyristors is broken down, the detection circuit outputs a high level switching value signal, the thyristor trigger device does not output the trigger signal under the action of the high level signal, and interphase short circuit caused by breakdown of the thyristors is avoided.

Description

Change controller

Technical field

The utility model relates to a kind of change controller, belongs to the electric machines control technology field.

Background technology

At present, domestic motor commutation control system as noncontacting switch, replaces mechanical switch to control with thyristor, and control system adopts electrical interlocks, controls the commutation operation of motor, in the situation that the thyristor rectifier phase fault of avoiding working properly.

Because thyristor is a kind of controlled semiconductor switches element, in use occur unavoidably puncturing, the failure conditions such as open circuit.And after thyristor lost efficacy, can affect the normal operation of equipment, especially in motor commutation control system, can cause phase fault and jeopardize equipment and personal safety.And present motor commutation control system take thyristor as main circuit; state before thyristor not being triggered detects; can export triggering signal even thyristor has punctured still, can't avoid the fault of phase fault, can not play a protective role to equipment and personal safety.

Summary of the invention

When the utility model adopts thyristor to change facies-controlled control switch as motor for solving, thereby easily cause phase fault to jeopardize the problem of equipment and personal safety, and then a kind of change controller is provided.For this reason, the utility model proposes following technical scheme:

Change controller, comprise five thyristor modules, each described thyristor module is comprised of two unidirectional thyristor inverse parallels, described change controller is connected on the current supply circuit of threephase asynchronous, described change controller also comprises five sampling modules, each described sampling module all is connected in parallel on the two ends of a thyristor module, and each described sampling module is all for detection of the voltage at described thyristor module in parallel with described sampling module two ends.

Whether the utility model detects thyristor by sampling module and lost efficacy, can before triggering, thyristor detect thyristor, testing circuit output low level switching value signal when thyristor does not puncture, when thyristor triggering device is exported triggering signal under the low level signal effect, testing circuit output high level switching value signal when any one thyristor punctures, thyristor triggering device is not exported triggering signal under the high level signal effect, avoid causing phase fault because thyristor punctures, thus raising equipment and personal safety.

Description of drawings

Fig. 1 is the electrical block diagram of the control system of existing threephase asynchronous;

The electrical block diagram of the first sampling end of the change controller that Fig. 2 provides for embodiment of the present utility model;

The electrical block diagram of the second sampling end of the change controller that Fig. 3 provides for embodiment of the present utility model;

The electrical block diagram of the 3rd sampling end of the change controller that Fig. 4 provides for embodiment of the present utility model;

The electrical block diagram of the 4th sampling end of the change controller that Fig. 5 provides for embodiment of the present utility model;

The electrical block diagram of the 5th sampling end of the change controller that Fig. 6 provides for embodiment of the present utility model.

Embodiment

The below is described in further detail the utility model: the present embodiment is implemented under take technical solutions of the utility model as prerequisite, has provided detailed execution mode, but protection range of the present utility model is not limited to following embodiment.

This embodiment provides a kind of change controller, as extremely shown in Figure 6 in Fig. 1, comprise five thyristor modules, each thyristor module is comprised of two unidirectional thyristor inverse parallels, corresponding change controller is connected on the current supply circuit of threephase asynchronous, this change controller also comprises five sampling modules, and each sampling module all is connected in parallel on the two ends of a thyristor module, and each sampling module is all for detection of the voltage at thyristor module in parallel with sampling module two ends.

Concrete, to shown in Figure 6, each sampling module comprises rectifier, filter circuit of pressure-stabilizing and photoelectrical coupler as Fig. 2, corresponding rectifier, filter circuit of pressure-stabilizing and photoelectrical coupler are connected successively.

Existing motor commutation control device take thyristor as main circuit mainly is made of thyristor circuit, power circuit, control circuit, interlock circuit and protective circuit.Thyristor circuit wherein provides system's output current; power circuit provides working power for control circuit; control circuit provides the thyristor control signal; the uniqueness that interlock circuit is identified control signal and guaranteed control signal is to avoid phase fault, and protective circuit prevents that main circuit parameter from surpassing the thyristor limiting value and damaging.The operation principle of the change controller that this embodiment provides is: before the main circuit thyristor triggers, detect the thyristor state, sampled signal is taken between thyristor anode and negative electrode, and whether export triggering signal by a switching value signal controlling thyristor gating circuit, if thyristor has punctured and controlled thyristor gating circuit and do not export triggering signal, avoid causing phase fault in the commutation operation.

1G1 in Fig. 1 and 1G2 are two unidirectional thyristors, and that be comprised of 1G1 and 1G2 inverse parallel is exactly thyristor module T1, and 1K1 and 1K2 are that sampling module is to two sampling ends of thyristor module T1.In like manner, T2, T3, T4 and T5 all represent thyristor module, and its structure is identical with thyristor module T1 with operation principle.

1K1 in Fig. 2 be connected with 1K2 with Fig. 1 in 1K1 be connected with 1K2, the circuit between the OUT1 in presentation graphs 2,1K1 and 1K2 is for detection of the 1K1 in Fig. 1 and the voltage signal between 1K2.In like manner, the structure of the OUT2 in Fig. 3 to Fig. 6, OUT3, OUT4 and OUT5 and related circuit is identical with OUT1 and related circuit with operation principle.

The course of work of the change controller that this embodiment provides comprises:

T1-T5 in Fig. 1 is two antiparallel high-power thyristor modules of unidirectional thyristor, thyristor module T1, T2, T3 conducting during the operation of threephase asynchronous forward, thyristor module T1, T4, T5 conducting during the counter-rotating operation; The sampling end (OUT1-OUT5 is defeated) of the sampling module in Fig. 2 to Fig. 6 is corresponding with five thyristor modules in Fig. 1, and what get is each thyristor both end voltage signal;

When threephase asynchronous was out of service, in Fig. 2 to Fig. 6, five sampling ends were ac high voltage (both end voltage is only for for tube voltage drop when advancing the brake tube conducting), so the output of the sampling output OUT1-OUT5 in Fig. 2 to Fig. 6 is low level; If being output as high level, certain road in the sampling output OUT1-OUT5 in Fig. 2 to Fig. 6 judges that namely this road is the thyristor breakdown fault;

When the threephase asynchronous main story is moved, because thyristor T1, T2, T3 conducting, so in Fig. 2 to Fig. 6, the sampling end of corresponding sampling module is low-voltage, not conducting of photoelectrical coupler input (there is no turn-on condition) is so the cut-off of photoelectric coupler output end triode, so being output as high level, T4, T5, the sampling output OUT1 in Fig. 2 to Fig. 4, OUT2, OUT3 do not have conducting thyristor two ends also to be ac high voltage, so sampling output OUT4, OUT5 in Fig. 5 to Fig. 6 are output as low level; Judge that namely this road is the thyristor open fault if certain road in the sampling output OUT1 in Fig. 2 to Fig. 4, OUT2, OUT3 is output as low level, judge that namely this road is the thyristor breakdown fault if certain road in sampling output OUT4, OUT5 in while Fig. 5 to Fig. 6 is output as high level;

When the threephase asynchronous anti-pass moves, because thyristor T1, T4, T5 conducting, so in Fig. 2 to Fig. 6, the sampling end of corresponding sampling module is low-voltage, not conducting of photoelectrical coupler input (there is no turn-on condition) is so the cut-off of photoelectric coupler output end triode, so being output as high level, T2, T3, the sampling output OUT1 in Fig. 2, Fig. 5 to Fig. 6, OUT4, OUT5 do not have conducting thyristor two ends also to be ac high voltage, so sampling output OUT2, OUT3 in Fig. 3 to Fig. 4 are output as low level; Judge that namely this road is the thyristor open fault if certain road in the sampling output OUT1 in Fig. 2, Fig. 5 to Fig. 6, OUT4, OUT5 is output as low level, judge that namely this road is the thyristor breakdown fault if certain road in sampling output OUT2, OUT3 in while Fig. 3 to Fig. 4 is output as high level;

Because the characteristic of thyristor current flows zero-crossing switching and the sampling module in Fig. 2 have filter circuit after rectification, so when halted state transfers main story operation, counter-rotating operation to, allow overcurrent turn-off the needed time, judge again later; The output of the sampling module in Fig. 2 can offer the back circuit and analyze, and analysis circuit can be that single-chip microcomputer, analog circuit etc. can accomplish that the circuit of analyzing and processing gets final product.

the technical scheme that adopts this embodiment to provide, whether detect thyristor by sampling module lost efficacy, can before triggering, thyristor detect thyristor, testing circuit output low level switching value signal when thyristor does not puncture, when thyristor triggering device is exported triggering signal under the low level signal effect, testing circuit output high level switching value signal when any one thyristor punctures, thyristor triggering device is not exported triggering signal under the high level signal effect, avoid causing phase fault because thyristor punctures, thereby raising equipment and personal safety.

The above; it is only the better embodiment of the utility model; these embodiments all are based on the different implementations under the utility model general idea; and protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement are within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claims.

Claims

1. change controller, comprise five thyristor modules, each described thyristor module is comprised of two unidirectional thyristor inverse parallels, described change controller is connected on the current supply circuit of threephase asynchronous, it is characterized in that, described change controller also comprises five sampling modules, and each described sampling module all is connected in parallel on the two ends of a thyristor module, and each described sampling module is all for detection of the voltage at described thyristor module in parallel with described sampling module two ends.

2. change controller according to claim 1, is characterized in that, each described sampling module comprises rectifier, filter circuit of pressure-stabilizing and photoelectrical coupler, and described rectifier, filter circuit of pressure-stabilizing and photoelectrical coupler are connected successively.