SU1612328A1 - Device for controlling inductive load - Google Patents

Abstract

The invention relates to electrical engineering and automation, in particular, devices for controlling two-section electrical loads of an active-inductive nature, for example, the windings of electromagnetic actuators. The aim of the invention is to increase speed. If the outputs of the control unit 1 are signals that open the keys 14 and 15, the mode of normal control of the currents of the load sections 4 and 5 is implemented. In the absence of these signals, the mode of forced current rise in one of the load sections while the current in the other is accelerated. 1 il.

Description

The invention relates to electrical equipment and automation, in particular to devices for controlling two-section HHbJMH electrical tension

Inductively induced nature, for example, the windings of electromagnetic actuators.

The purpose of the invention is to increase the speed of

 The drawing shows the constructive scheme of the proposed inductive load control device,

The device includes a control unit 1 with two pairs of outputs, and also two units 2 and 3 of control, each one of which contains another load 4 (5), transis;: op 6 (7), diode 8 (9 ), Zener diode 10 (11), Res Source 12 (13), key 14 (15). In addition to TorOs, the device detects two. Ventil 16 and 17, the first pin 18, the second pin 19 for connecting a power source (not shown). At the same time, in each node 2 and 3 of the control, neither Zener diode 10 (11) is connected between the collector and the base of transistor b (7), and the resistor 12 (13) - mevdu emitter and base of the transistor, the emitter of transistor 6 (7) is connected to the first output 18 to receive the power source 5 and the collector of the transistor - to the first pole a and c (load sec 4 (5) and with the input 1 of the connector 14 (15), the output of which is connected to the second pole b (b) of the secant load 4 (5), The leading input 14 (15) and the base of the transistor 6 (7) are connected in pairs with the codes of the control unit 1, the diode 8 (9) is switched on by the second terminal 19 for connecting the power supply and the second pole b (b) of the load section 4 (5). Valve 16 is turned on between the first pole C

load section 5 node 3 control-peni

and the second pole b of the load 4 nodes 2 ypravleni. respectively

valve 17 is connected between the first pole - q load sections 4 nodes 2

. control and the second pole b of the load section 5 of the node a 3 control ,,

The device works as follows.

When the main mode is implemented - smooth control of currents in load sections 4 and 5 - signals for opening keys 14 and 15 are set at two outputs of control unit 1. The required value of section currents is

five

0

five

0

five

40

45

50

55

loads 4 and 5 are set by changing the time parameters opening transistors 6 and 7 and multiples generated by control unit 1 at its other outputs. If these pulses are present, the currents in the control nodes 2 and 3 flow through the circuit respectively: the second output 19 for connecting the power supply to the power supply — a diode 8 (9) —the load section 4 (5) —the transistor 6 (7) —the first output 18 for connecting the source nutrition The keys 14, 15 and the valves 16, 17 are closed by the reverse voltage applied to them. In the pauses between pulses, the transistors 6, 7 and diodes 8, 9 are closed, while the currents of the load sections 4 and 5, due to their inductive nature, are closed through the open keys 14 and 15, the voltages at the first poles of the a, I load sections differ slightly from power supply voltage and stabilitrons 10, 11 zakryp-s (Zener diodes are selected with a breakdown voltage exceeding the supply voltage) "The energy dissipation on transistors 6 and 7 in the main mode is insignificant. In the forced mode, the current is accelerated in one of the load sections while the current in the other load section is accelerated.

To implement the forced mode, the control unit 1 generates signals for closing its keys 14 and 15 at its two outputs, a signal for opening the corresponding transistor 6 or 7 is generated at one of the two terminals of the control unit, and at the second for closing the other transistor . In particular, to simultaneously form current buildup in the load section

4 and current reduction in the load section

5 block 1 control signals the closing of the transistor 7 and the opening of the transistor 6 The resulting self-induced EMF causes a breakdown of the zener diode 11, as a result of which the transistor 7 opens a little

Current. The inductive nature of the load section 5, flows through the diode 9, h hstically through the transistor 7, partially through the opened gate 16, another load section 4 and the open transistor 6,

516

In this case, the voltage across the transistor 7

determining the potential difference between the poles d, b of the load section 5 in the process of current decay, and accordingly the increase in the dissipation rate of energy stored in the load section 5 (current decay rate) directly depends on the voltage of the zener diode and, if necessary, can be set to the level significantly higher than the supply voltage. In this case, since a voltage is applied to the second pole through the voltage 16 to the second pole of the load 4, the accelerated current increases in the load section 4. The mode of forced variation of the currents of the load sections in reverse order is realized in a similar way.

The advantage of the proposed device in comparison with the known one is the possibility of realizing the modes of accelerated decrease and increase of winding currents without the use of additional sources of electrical voltage, which increases its speed and reduces its cost.

Formula-invention

An inductive load control device comprising a control unit having two pairs of outputs, two control nodes, each of which includes a load section, a transistor, a diode, a zener diode, a resistor

10 and a key, with a zener diode connected between the collector and the base of the transistor, and a resistor between the emitter and the base of the transistor, the emitter of the transistor is connected to the first terminal of the power supply, and the collector to the first pole of the load section and to the key input, the output of which is connected to the second pole of the load section, which reduces the output of the key and the base of the transistor, are pairwise connected to the outputs of the control unit, characterized in that, in order to improve speed, it additionally contains two valves, each of which is turned on between the opposite poles of the load sections included in different control nodes, with diodes in each control node being connected between the second output

30 for connecting the power supply and the second pole of the load section.

15

20

25

Claims (1)

claims A device for controlling an inductive load, comprising a control unit having two pairs of outputs, two control units, each of which includes a load section, a transistor, a diode, a zener diode, resistor 10 and a key, the zener diode being connected between the collector and the base of the transistor, and the resistor between the emitter and the base of the transistor, the emitter of the transistor is connected to the first output. for 15 connecting the power source, and the collector to the first pole of the load section and to the key input, the output of which is connected to the second pole of the load section, the branching output of the key 20 and the base of the transistor are connected in pairs with the outputs of the control unit, characterized in that, with a speed-improving circuit, it additionally contains two valves, 25 of which are each connected between the opposite poles of the load sections included in different control units, while the diodes in each control node are connected between the second pin 30 for connecting the power source and the second pole of the load section.