CN202541908U

CN202541908U - Pulse type direct current electromagnet control circuit

Info

Publication number: CN202541908U
Application number: CN2012201421199U
Authority: CN
Inventors: 李伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-06
Filing date: 2012-04-06
Publication date: 2012-11-21
Anticipated expiration: 2022-04-06

Abstract

The utility model discloses a pulse type direct current electromagnet control circuit, wherein the delivery outlet of a computer is divided into two paths, one path is connected with the negative input end of a voltage comparator A3 through a capacitor C3, the capacitor C3 and the A3 are grounded through a resistor R1, the positive input end of the A3 is connected with a high level, the output end of the voltage comparator A3 is connected with the input pin 1 of a NOT-AND gate A1, the output pin 3 of NE555 is connected with the input pin 2 of the NOT-AND gate A1, a pull-up resistor R4 is arranged between the output end of the voltage comparator A3 and the NOT-AND gate A1, the other path of the output signal of the computer is connected with the input pin 1 of a NOT-AND gate A2, the output end of the NOT-AND gate A1 is connected with the input pin 2 of the NOT-AND gate A2, the output end of the NOT-AND gate A2 is connected with a base electrode of a triode VT1 through a resistor R5, a collector electrode of the VT1 is connected with the base electrode of a triode VT2 through a resistor R7, and a coil L and a diode VD are connected to the collector electrode of the VT2 in parallel. The pulse type direct current electromagnet control circuit has the advantages of simple structure, high reliability and the like.

Description

Pulsed DC electromagnet control circuit

Technical field

The utility model relates to the DC electromagnet control circuit, particularly a kind of pulsed DC electromagnet control circuit.

Background technology

The DC electromagnet control circuit can be used for bag packer and pack operation, because the action of bag packer discharging opening is only opened and closed, original bag packer is to accomplish This move through pneumatic system; Because of pneumatic system exists a lot of unconquerable shortcomings (as: low temperature fault, system loaded down with trivial details etc.), therefore change power driven system into, if but also will cause complex structure, complex operation with motor operation; In order to address this problem; We have designed DC electromagnet voluntarily, open the door with separating to close with the adhesive of DC electromagnet, if but the DC electromagnet electric current is big, under the situation of long-term energising; Remanent magnetism is bigger when heating easily, disconnection, causes and opens the door slowly; Because of the adhesive distance is bigger, electric current hour suction is not enough, can't adhesive.In order to address the above problem, we have designed the pulsed DC electromagnet control circuit shown in figure one, and this circuit has well solved the problems referred to above, and in practical application, has obtained check, advantage such as that this circuit has is simple and practical, good reliability.

Summary of the invention

The purpose of the utility model is to overcome the deficiency of prior art, and a kind of pulsed DC electromagnet control circuit of simple and practical, good reliability is provided.

The technical scheme of the utility model is following:

Pulsed DC electromagnet control circuit; The computer delivery port is divided into two-way, and one the tunnel is connected with voltage comparator A3 negative input end through capacitor C 3, between capacitor C 3 and the voltage comparator A3 through resistance R 1 ground connection; The positive input terminal of voltage comparator A3 links to each other with high level after resistance R 2, R3 dividing potential drop; The mouth of voltage comparator A3 connects the input pin 1 of NAND gate A1, and the output pin 3 of NE555 is connected with the input pin 2 of NAND gate A1, and C1, C2, R8 are the peripheral components of NE555; Be provided with pull-up resistor R4 between the mouth of voltage comparator A3 and the NAND gate A1; Another road of computer output signal connects the input pin 1 of NAND gate A2, and the mouth of NAND gate A1 connects the input pin 2 of NAND gate A2, and the mouth of NAND gate A2 links to each other with the base stage of low saturated step-down aerotron VT1 after resistance R 5; The collecting electrode of VT1 links to each other through the base stage of resistance R 7 with aerotron VT2, is parallel with magnet coil L and flywheel diode VD on the collecting electrode of VT2.

The advantage of the utility model is:

Can adopt motor operation during the bag packer charging, can adopt the utility model during discharging, the utility model is because the pulsed DC electromagnet control of adopting has advantages such as simple in structure, good reliability; Make load reduce power consumption, reduced temperature build-up; Reduced remanent magnetism, the system that guaranteed works reliably.

Description of drawings Fig. 1 is the utility model schematic circuit diagram.

The specific embodiment is described further the utility model below in conjunction with accompanying drawing.

Can see the structure of the utility model by Fig. 1, pulsed DC electromagnet control circuit, computer delivery port 1 is divided into two-way; One the tunnel is connected with voltage comparator A3 negative input end through capacitor C 3; Through resistance R 1 ground connection, the positive input terminal of voltage comparator A3 links to each other with high level after resistance R 2, R3 dividing potential drop between capacitor C 3 and the voltage comparator A3, and the mouth of voltage comparator A3 connects the input pin 1 of NAND gate A1; The output pin 3 of NE555 is connected with the input pin 2 of NAND gate A1; C1, C2, R8 are the peripheral components of NE555, are provided with pull-up resistor R4 between the mouth of voltage comparator A3 and the NAND gate A1, and another road of computer output signal connects the input pin 1 of NAND gate A2; The mouth of NAND gate A1 connects the input pin 2 of NAND gate A2; The mouth of NAND gate A2 links to each other with the base stage of low saturated step-down aerotron VT1 after resistance R 5, and the collecting electrode of VT1 links to each other through the base stage of resistance R 7 with aerotron VT2, is parallel with magnet coil L and flywheel diode VD on the collecting electrode of VT2.

The principle of work of the utility model is following:

(1), when weighing system is prepared to weigh, computer delivery port 1 output 0 signal, at this moment 1 pin of NAND gate A2 is input as 0; Then A2 is output as 1; After low saturated step-down aerotron VT1 is reverse, aerotron VT2 is ended, magnet coil L no current passes through; Electromagnet is not worked, and the bag packer discharging opening is opened;

(2), when the bag packer charging, discharging opening adhesive, 1 signal of computer delivery port 1 output at this moment.Because capacitor C 3 voltage of the negative input end of voltage comparator A3 can not be suddenlyd change, the high level of positive input terminal will appear being higher than about 2 seconds in the A3 negative input end, make comparator A3 be output as 0; Therefore A1 is output as 1, because the input of 1,2 bipods of A2 is all high level, so A2 is output as the low level about 2 seconds; This section period, VT1 ended; VT2 conducting, DC electromagnet are in the conducting state always about 2 seconds, and at this moment magnet coil L is because of feeding stable electric current; Suction will be in maximum rating, electromagnetic actuation;

(3), when electromagnet after reliable adhesive about 2 seconds, C3 voltage will be charged to certain value, A3 negative input end voltage will be lower than the A3 positive input terminal this moment; Comparator A3 exports high level 1, the output of A1 and the output anti-phase of NE555 oscillator at this moment, and A2 is because 1 pin is input as 1; So output anti-phase of the output of A2 and A1; With NE555 oscillator homophase, at this moment VT2 ends when NE555 oscillator output high level, and electromagnet is obstructed; VT2 conducting when NE555 oscillator output low level, magnet coil L will obtain a pulse current like this;

(4), when weighing system needs blowing, the computer expert crosses delivery port 1 output 0 signal, at this moment A2 will be by locked, A2 is output as 1, after the VT1 anti-phase VT2 is ended, the electromagnet outage, at this moment discharging opening is opened.

Claims

1. pulsed DC electromagnet control circuit; It is characterized in that: computer delivery port (1) is divided into two-way, and one the tunnel is connected with voltage comparator A3 negative input end through capacitor C 3, between capacitor C 3 and the voltage comparator A3 through resistance R 1 ground connection; The positive input terminal of voltage comparator A3 links to each other with high level after resistance R 2, R3 dividing potential drop; The mouth of voltage comparator A3 connects the input pin 1 of NAND gate A1, and the output pin 3 of NE555 is connected with the input pin 2 of NAND gate A1, and C1, C2, R8 are the peripheral components of NE555; Be provided with pull-up resistor R4 between the mouth of voltage comparator A3 and the NAND gate A1; Another road of computer output signal connects the input pin 1 of NAND gate A2, and the mouth of NAND gate A1 connects the input pin 2 of NAND gate A2, and the mouth of NAND gate A2 links to each other with the base stage of low saturated step-down aerotron VT1 after resistance R 5; The collecting electrode of VT1 links to each other through the base stage of resistance R 7 with aerotron VT2, is parallel with magnet coil L and flywheel diode VD on the collecting electrode of VT2.