SU903822A1 - Technical parameter regulator - Google Patents

Description

The invention relates to control devices with various sensors that are sensitive to the effects of physical quantities, in particular to pressure and displacement temperature controllers operating in systems ^S where high accuracy, reliability and low power consumption are required.

A device is known that contains a fixed change-over contact sensitive to the effects of an adjustable parameter, a heat-sensitive element, a feedback electromagnet *, a spark arrester, a relay _{| 5} amplifier, an electric motor with a feedback potentiometer [13 ·

However, it has low accuracy.

It is also known a device for PE _m gulirovki process parameters, which includes a contact sensor, power source, the first switching transistor; to the droplet 2 of which one OUT ^{4 of the} first windings of the switch is connected £ 2 However, it has low efficiency.

Closest to the proposed is a device for regulating technological parameters, which contains a contact sensitive element, a power source, transistors, resistors, a remote switch with two windings [3].

A disadvantage of the known device is low dynamic accuracy of regulation, as well as high power consumption.

The purpose of the invention is to improve the accuracy and efficiency of the regulator.

The goal is achieved by>

that the controller of technological parameters, containing the first and second key transistors, the collectors of which are connected to the first terminals of the windings of the two-point switch, the emitters - to the switching terminal 3 of the 903822 4-stroke of the two-position switch and to the middle terminal of the bipolar power source, to the other terminals of which the second terminals of the windings are connected, and base - to the make and break 5 contacts of the on / off switch, contains a nulorgan connected to the source, bipolar power and connected between it in feedback resistors, and the output of the zero-organ through the limiting resistors is connected to the bases of the first and second key transistors by the moves and collectors of the first and second key transistors. fifteen

The drawing shows a circuit diagram of a controller of technological parameters.

The controller consists of a transmitter. (not shown in the drawing) connected to the input terminals 1, zero-organ 2, a bipolar power source with terminals 3 ”4 and 5, a two-winding on-off switch 6, resistors 7 and 8, in the first 9 and second 10 key transistors switching 11, opening 12 and closing 13 contacts, as well as output contacts 14, which are used to turn on and off the actuators, and resistors 15, 16, 17 and 18.

The operation of the regulator is as follows.

In the initial state, i.e. when _{35 the} controlled parameter is lower than the set, the switching contact 11 of the on-off switch 6 is closed with the contact 13 and open with the contact, volume 12. The transistor 9 is closed, since _{40 the} voltage at the output of the zero-organ 2 is lower than the voltage at the emitter of the first key transistor 9. The transistor 10 is closed, because between the emitter and the base there is a normally closed pair of koh- _4J clocks 11 and 13 · In the initial state, both transistors 9 and 10 are closed and the on / off switch is turned off, i.e. does not consume current from the power source. $ 0

If the controlled parameter exceeds the preset value, the unbalance signal through the resistors 17 and 18 is fed to the input of the zero-organ, the output of which increases the voltage and becomes larger than the emitter of the transistor 9, which opens, and the on-off switch 6 is triggered by the winding included between terminal 3 of the bipolar power source and the collector of transistor 9. By. as transistor 9 opens, the voltage from its collector through resistor'15 is applied to the input of zero-organ 2, forming a positive feedback, which will act from the moment the imbalance signal appears at the input of the regulator and until the on / off switch 6 is switched. In this case, contact 11 opens with contact 13 and closes with contact 12, which will lead to the closing of the transistor 9 and the cessation of current through the winding.

Thus, the windings of the on / off switch after the switching process remain de-energized. Generating dynamic positive feedback reduces dynamic hysteresis, thereby increasing the accuracy of regulation.

When the controlled parameter reaches a value below the permissible unbalance signal from the input of the zero-organ 2 is removed ^ the voltage at its output decreases and becomes such that the transistor 10 opens. The on-off switch 6 is triggered by a winding connected between the output of the bipolar power source 5 and the collector of the transistor 9. In this case, the contact 11 will open with the contact 12 and will be closed with the contact 13 (i.e. all the changeover contacts will return to the initial state shown in the drawing), which will lead to the closing of the transistor 10 and the termination of the current through the winding. The contacts of the on / off switch will remain in this initial position until the next controlled parameter is exceeded above the permissible value.

So, when turning the controller on and rit> n off, the power from the power source is consumed by the on-off switch only during the switching time, and since this power, the power consumption of the controller is mainly determined, i.e. the power consumed from the source is reduced.

Claims (3)

1. Gribanov N.G. High-rise equipment aircraft Graisdan aircraft. M. ,, Energie, 1971, p. 125, Fig. 6, 10. 2. USSR author's certificate If 35507, cl. 6 85 V 23/19, 1977. 3. Authors certificate of the USSR P 596923, kp. G 05 D 23/19, 1979 (prototype) ...