RU25958U1 - ELECTROMAGNET CONTROL DEVICE - Google Patents

Description

MPK 7NO1 F7 / 00 Electromagnet control device

The proposed utility model relates to the field of electrical engineering and can be used to control (turn on) contactors, starters (with a DC winding), solenoid valves, etc.

Known control devices of the above elements, which provide for supplying them with a nominal voltage and maintaining its value for the entire period of operation.

Contactors with a starting winding are known when, at the moment of switching on, a starting current is passed through the contactor winding to force switching on, an order of magnitude higher than the working one, and then the holding winding is turned on. The disadvantage of these contactors is the presence of mechanical contacts switching the windings.

There are known schemes when, at the moment of turning on the electromagnet, an increased voltage pulse is supplied to its winding due to the charged capacitance, which ensures forced switching on of the electromagnet.

The prototype of the proposed utility model is an electromagnet control device according to application No. 99115070/09 of 07/12/1999 l.

The disadvantage of this device is the complexity of the circuit (the presence of a voltage stabilizer, integrated circuits, logic elements, etc.).

The proposed utility model is aimed at simplifying the circuit of the control device of the electromagnet and increasing its reliability.

This is achieved due to the fact that the electromagnet control device containing the first and second power terminals, respectively connected with the positive and negative poles of the power supply, the electromagnet winding, a series of chains from the first key and the first diode, and the key is connected to the negative of the power source and the winding electromagnet, the cathode of the first diode is connected to the second terminal of the electromagnet winding, the second diode connected by the anode to the positive pole of the power source, and the cathode to the cathode of the first diode yes, a capacitor, one output of which is connected to the cathodes of the first and second diodes, the control input of the first key is connected to the command bus of switching on the electromagnet, the second key is introduced, the input of which is connected to the positive pole of the power source, the output is connected to the second terminal of the capacitor, and the control input is connected to the command bus for switching on the electromagnet, and a charging resistor, one output of which is connected to the output of the second key, and the second to the negative pole of the power source.

This embodiment of the utility model provides an increased current pulse through the electromagnet winding due to the pre-charged

capacitor, followed by a reduction to the nominal value, simplifies the circuit of the known device and increases its reliability.

As the keys in the circuit, transistors can be used.

The essence of the utility model is illustrated by drawings, where in FIG. 1 is a functional diagram of the device, FIG. 2 is a schematic diagram of a device with the implementation of a circuit on transistor switches, and FIG. 3 is a graph of voltage across an electromagnet winding when turned on.

Information confirming the possibility of manufacturing a device with the above technical result is as follows.

The electromagnet control device contains (Fig. 1) the first 1 and second 2 power terminals connected respectively to the positive and negative poles of the power supply 3, the winding of the electromagnet 4, a series circuit from the first key 5 and the first diode 6, and the first key 5 is connected to the negative the pole of the power supply 3 and the winding of the electromagnet 4, the cathode of the first diode 6 is connected to the second terminal of the winding of the electromagnet 4, the second diode 7 connected by the anode to the positive pole of the power supply 3, and the cathode to the cathode first 6th diode, capacitor 8, one output of which is connected to the cathodes of the first 6 and second 7 diodes, the control input of the first key 5 is connected to the command bus 9 of switching on the electromagnet, the second key 10, the input of which is connected

with a positive pole of the power supply 3, the output with the second terminal of the capacitor 8 and one terminal of the charging resistor 11, the second terminal of which is connected to the negative pole of the power source 3, and the control input of the second key is connected to the command bus for switching on the electromagnet.

The operation of the device is as follows.

When connecting the power source 3 to the terminals 1, 2, the capacitor 8 is charged along the circuit “+ power supply 3 - diode 7 - capacitor 8-charging resistor 11 -“ - power supply 3.

After giving the command to turn on the electromagnet to the command bus 9, the keys 5 and 10 are opened. The first key 5 is opened and prepares the current path through the winding of the electromagnet 4.

Opening the second key 10 enables the charging of the charged capacitor 8 in series with the power source 3. There is a discharge of the capacitor 8. In this case, the current through the winding of the electromagnet 4 is provided by the total voltage of the power source 3 plus the voltage of the charged capacitor 8.

The current passes through the circuit - "+ power supply 3 - key 10 - capacitor 8 - winding of the electromagnet 4 - key 5 -" - power supply 3.

Due to the discharge of the capacitor 8 provides an increased current pulse

through the winding of the electromagnet 4 at the time of its inclusion.

After the discharge of the capacitor 8, the current path remains - “+ power supply 3 - diode 7 - electromagnet winding 4 - key 5” - power supply 3, providing the rated current of the winding. At the same time, current flows through the charging resistor 11 through the switch 10.

After removing the command to turn on the electromagnet from the command bus 9, the circuit returns to its original state. The capacitor 8 is charging and the circuit is ready for operation. In this case, the diode 6 provides suppression of the emf self-induction of an electromagnet winding 4.

Presented in FIG. The circuit diagram of the device 2 provides, at UHHT - 27 V and capacitance C 2000 μF, forced switching of the electromagnet with a rated current of 2 A. Moreover, the duration of the current pulse when turned on is 10 ms, which is sufficient for the operation of this electromagnet. With the value of the charging resistor KZ 750 Ohm, the charge of the capacitor C takes about 2 seconds, and the magnitude of the additional current through the charging resistor when the electromagnet is on is -36 mA, which is more than an order of magnitude less than the working current of the electromagnet. Power loss is only 1 watts.

In FIG. Figure 3 shows that at the first moment after switching on, the voltage on the winding of the electromagnet is equal to twice the value of the supply voltage.

Literature

1 Application of the Russian Federation for invention No. 99115070/09 of 07/12/1999, BIPM No. 16, 4.1,2001.

Claims (2)

1. The control device of the electromagnet, containing the first and second power terminals, respectively associated with the positive and negative poles of the power source, an electromagnet winding, a series of chains from the first key and the first diode, the first key connected to the negative pole of the power source and the electromagnet winding, cathode of the first the diode is connected to the second terminal of the electromagnet winding, the second diode connected by the anode to the positive pole of the power source, and the cathode to the cathode of the first diode, conden an ator, one output of which is connected to the cathodes of the first and second diodes, the control input of the first key is connected to the command bus of switching on the electromagnet, characterized in that it contains a second key, the input of which is connected to the positive pole of the power source, the output is with the second output of the capacitor, and the control input is with a command bus for switching on the electromagnet, and a charging resistor, one terminal of which is connected to the second terminal of the capacitor and the output of the second key, and the second terminal to the negative pole of the power source. 2. The electromagnet control device according to claim 1, characterized in that transistors are used as keys.