CN2153862Y

CN2153862Y - Intelligent ac magneto-electric device

Info

Publication number: CN2153862Y
Application number: CN 92246093
Authority: CN
Inventors: 张培铭
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 1992-12-31
Filing date: 1992-12-31
Publication date: 1994-01-19
Anticipated expiration: 2002-12-31

Abstract

The utility model relates to an intelligent AC magneto-electric device which comprises a direct current power supply, a main circuit, a control circuit, a drive circuit and a control main program. According to the optimal design of the dynamic state of the AC magneto-electric device, the control main program is preprogramed and is suitable for a monolithic computer; so the closing process, the breaking process and the operating state of the contact of the main circuit can be controlled; thereby, the optimum control scheme is realized, the operational reliability is improved, the contact jumpiness is eliminated, the impact energy of an iron core is reduced, the breaking effect can be realized when the contact voltage or the current exceeds zero or tends towards zero, the electric arc energy is reduced, the long lifetime of the electric device is prolonged, the energy saving effect is achieved obviously, and the high economic benefit is realized.

Description

Intelligent AC magneto-electric device

The utility model relates to a kind of novel intelligent AC electromagnetic appliance, belongs to alternating electromagnetic appliance field, particularly A.C. contactor classification;

In recent years, development along with microelectric technique and microprocessor, traditional control apparatus has been produced profound influence, the electromechanical integration of electric elements and the complete sets of equipment has become an important development direction of domestic and international electrical apparatus industry, " selection of best closing phase angle in the intelligent AC electromagnetic system " delivered as " the 5th national low-voltage electrical apparatus nd Annual Meeting " is exactly a kind of scheme of existing intelligent AC contactor, it is to adopt AC power to control ac contactor coil through main thyristor, and afterflow is finished by fly-wheel diode.But, the shortcoming of this scheme is:

1, main thyristor turn-offs constantly uncontrollable;

2, the connection phase place of each cycle all is consistent, fails to realize optimizing;

3, supply voltage can't increase considerably the startup magnetic potential again, therefore also can't increase considerably counter-force;

4, continued flow component is a diode, though energy-saving effect is remarkable, can't realize breaking course control, makes release time very long, and its electric life is very low.

Because above shortcoming causes A.C. contactor can not realize starting dynamic process control and disjunction control, also can't realize optimal control certainly, because arc energy increases, has therefore reduced electric life on the contrary.Its performance economic index is very poor.

The purpose of this utility model is development and provides a kind of novel intelligent AC electromagnetic appliance to realize:

1. in system starting process, make ac electromagnetism system under different supply voltages, carry out different control programs, thus contact closure when being implemented in contact voltage automatically and being zero, and eliminate contact bounce, make the iron core Impact energy reach minimum;

2. in system's breaking course, controlled, and increase counter-force significantly, the contact electric current is zero cut-offfing constantly to make the ac electromagnetism system coil, or when voltage is zero, cut-off load current and interrupting process very short release time, it is very big that contact cut-offs speed, it is very little to cut-off arc energy between contact, thereby make the contact wearing and tearing very little, and can increase substantially electrical endurance;

3. energy saving in running is effective.

The technical scheme that realizes the utility model purpose is:

Novel intelligent AC electromagnetic appliance is made up of DC power supply, main circuit, control circuit, drive circuit and control main program, it is characterized in that:

(1) main circuit is by step-down transformer, full-wave rectifier, ac electromagnetism system coil, and controllable afterflow element and main transistor are formed; Its annexation is the AC side that the limit winding is connected to full-wave rectifier D of paying of step-down transformer T, the anode of full-wave rectifier D connects the end of ac electromagnetism system coil J respectively, controllable afterflow element S one end, the other end of the other end of coil J and controllable afterflow element S joins, be connected to the collector electrode of main transistor TR again, and the emitter of TR is connected to the negative terminal of rectifier D, and the base stage of TR connects an end of drive circuit output, and the control utmost point of controllable afterflow element S connects the other end of drive circuit output;

(2) drive circuit is by NAND gate E4, E5, NOR gate E6, photoelectrical coupler E7, E8, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, low-power transistor D1, D2 form, its annexation is that contact P1.0, the P1.1 from single-chip microcomputer W2 draws, P1.1 is connected to E4 and is connected in series with the base stage of E5, R2 and D1 successively, and power supply+5V is connected to E4, E5 and R1, and the other end of R1 is connected to photoelectrical coupler E7, collector electrode with D1 joins then, D1 grounded emitter, the output of E7 are connected to the end of controllable afterflow element S through R3; P1.0 is connected to E6, and be connected in series base stage with R6 to D2, another contact of D2 emitter and E6 joins with ground, the collector electrode of D2 and photoelectrical coupler E8 join, and+the 5V power supply joins by R4 and E8, + 7V power supply joins by R5 and E8, after joining, the output of E8 and R8 be connected to the emitter of main transistor TR, the base stage of the other end of R8 and low-power transistor D3 is joined, the collector electrode of D3 is connected to power supply+7V by R7, and the emitter of D3 is connected to the emitter of TR by R9, and the other end of R9 links to each other with R8, the emitter of D3 links to each other with the base stage of TR, and the grounded emitter of TR.

(3) control circuit is by NOR gate E1, E2, NAND gate E3, A/D converter W1, singlechip chip W2, address latch W3, EPROMW4 and capacitor C 1, C2, C3, form.Its annexation is, receive A/D converter by the signal that voltage or power pack come, be connected to the Single Chip Microcomputer (SCM) system of band ROM then, and the power supply of A/D converter and Single Chip Microcomputer (SCM) system is provided+the 5V power supply by rectifier power source, be connected to two parts of drive circuit respectively by the control signal of Single Chip Microcomputer (SCM) system output, and by after level adjustment and the electrical isolation, a TR base stage of being defeated by in the main circuit, a control utmost point of being defeated by controllable afterflow element S in the main circuit;

(4) working procedure between above-mentioned each circuit is to be carried out by the best design of pre-designed novel intelligent alternating electromagnetic electrical equipment, and realize by the Single-chip Controlling main program.

Its control main program is realized according to the following steps: (See Fig. 4)

Fig. 1 (a) is the main circuit component winding diagram of embodiment (a);

Fig. 1 (b) is the main circuit component winding diagram of embodiment (b);

Fig. 2 is the structured flowchart of control circuit of the present utility model and drive circuit;

Fig. 3 is the utility model cut-away drawing; Fig. 4 is main program figure.

Wherein:

Designation model, specification

W1 A/D converter AC0809

W2 singlechip chip 8031

The W3 address latch 74ls373

W4 EPROM EPROM 2732

E1, E2, E6 NOR gate 74LS02

E3, E4, E5 NAND gate 74LS0D

E7, E8 photoelectrical coupler 4N32

TR power transistor 2SD1403

S controllable afterflow element 3CT5A, 1000V

D1, D2, D3 low-power transistor 3DG12B

Now further structure situation of the present utility model is illustrated in conjunction with the accompanying drawings and by the most preferred embodiment (a) and (b);

Embodiment (a):

Select for use the afterflow thyristor as controllable afterflow element S in the present embodiment, in the case, the end of coil J in the alternating electromagnetic electrical equipment main circuit and the anode of afterflow thyristor join, and then being connected to the collector electrode of main transistor TR, the novel technical scheme narration of the annexation of other parts of circuit and this reality is identical.

Embodiment (b)

Select for use the afterflow transistor as controllable afterflow element S in the present embodiment, in the case, the end of coil J in the alternating electromagnetic electrical equipment main circuit and the transistorized collector electrode of afterflow join, and then being connected to the collector electrode of main transistor TR, the annexation of other parts of circuit is identical with the technical solution of the utility model narration.

The utility model advantage compared with prior art is:

1, makes alternating electromagnetic electrical equipment realize contact closure when contact voltage is zero, and eliminated contact bounce, make the iron core Impact energy reach minimum;

2, make alternating electromagnetic electrical equipment realize control at breaking course, and counter-force is strengthened significantly;

When 3, alternating electromagnetic electrical equipment being cut-off, the contact electric current is zero, or voltage cut-offs load current when being zero, greatly shortened release time, and contact cut-offs speed and increases, thereby has reduced the energy that cut-offs electric arc, and the wearing and tearing of minimizing contact have increased considerably electrical endurance, have improved economic benefit;

4, good energy-conserving effect.

Claims

1, novel intelligent AC electromagnetic appliance is made up of DC power supply, main circuit, control circuit, drive circuit and control main program, it is characterized in that:

(2) drive circuit is by NAND gate E4, E5, NOR gate E6, photoelectrical coupler E7, E8 resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, low-power transistor D1, D2 form, its annexation is that contact P1.0, the P1.1 from single-chip microcomputer W2 draws, P1.1 is connected to E4 and is connected in series with the base stage of E5, R2 and D1 successively, power supply+5V is connected to E4, E5 and R1, the other end of R1 is connected to photoelectrical coupler E7, and the collector electrode with D1 joins then, the D1 grounded emitter, the output of E7 is connected to the end of controllable afterflow element S through R3; P1.0 is connected to E6, and be connected in series base stage with R6 to D2, another contact of D2 emitter and E6 joins with ground, the collector electrode of D2 and photoelectrical coupler E8 join, and+the 5V power supply joins by R4 and E8, + 7V power supply joins by R5 and E8, after joining, the output of E8 and R8 be connected to the emitter of main transistor TR, the base stage of the other end of R8 and low-power transistor D3 is joined, the collector electrode of D3 is connected to power supply+7V by R7, and the emitter of D3 is connected to the emitter of TR by R9, and the other end of R9 links to each other with R8, the emitter of D3 links to each other with the base stage of TR, and the grounded emitter of TR;

2, novel intelligent AC electromagnetic appliance according to claim 1, it is characterized in that: in main circuit, select for use the afterflow thyristor as the controllable afterflow element, and the end of the coil J in the main circuit is connected with the anode of the brilliant pipe of afterflow, and then be connected to the collector electrode of main transistor TR.

3, according to claim 1 or the described novel intelligent AC electromagnetic appliance of claim 2, it is characterized in that: in main circuit, select for use the afterflow transistor as the controllable afterflow element, and the end of the coil J in the main circuit and the transistorized collector electrode of afterflow are joined, and then be connected to the collector electrode of main transistor TR.