SU1004996A1 - Two-position control - Google Patents

Description

(54) TWO-HUSHING REGULATOR

t

The invention relates to automatics and is intended to control and on-off adjustment of the level of bulk: and liquid media, development, and other parameters that ensure the switching of the contacts of sensors.

i. The known regulator used to stabilize the liquid level contains two reed switches located on the reservoir, a permanent magnet located on the float, an actuator and a timistor whose control transition is shunted by the first reed switch and connected to the power source through the second reed switch parallel to which the accumulation is switched contacts of the actuator, the input connected to the output of the triac lj.

However, in the known controller, contactless automation devices cannot be used: valves, electromagnets, electric motors, heating elements, etc., not the name of the auxiliary contacts. The use of actuators with interlock contacts operating at low voltage supply reduces the reliability of the known circuit.

The closest technical solution is a two-position regulator containing an executive body, through a thyristor connected to an AC network, the first thyristor connected by a cathode to the negative terminal of a DC power supply, the positive terminal of which is connected to the cathode of the triac connected in series with the first thyristor limiting resistor, and contact sensors 2.

This device also does not have the ability to use contactless actuators of automation, such as valves, electromagnets, electric motors, etc., without contact blocking. Introduction to the specified 20 scheme of intermediate relays and their contacts reduces the reliability of its work.

The aim of the invention is to simplify the regulator.

The goal is achieved by

25 that a two-position regulator containing an actuator, through a thyristor connected to an AC network, is a first thyristor connected by a cathode to a negative output of a DC power source, the positive terminal of which is connected to a cathode of a triac, connected in series with the first thyristor a transistor with an RC circuit in the emitter circuit, the first base of a single-input transistor connected to the control electrode of the first thyristor, and the second base and RC-k The sensor is connected to the positive output of a constant voltage power source, to which the first thyristor anode is connected via a resistor, as well as contact sensors, contains a second thyristor, through which the control electrode of the triac is connected to the second output of the limiting resistor, the second cathodes the thyristor and the triac are connected via the first contact sensor, and their control electrodes are connected via the second contact sensor. The drawing shows the scheme of the proposed controller. The circuit includes an actuator 1, for example, a magnetic starter, an electromagnet of a gate or damper, a pump electric motor and Tin. connected to the AC mains (terminals 2 and 3) through a triac 4 with contact sensors 5 and 6. in the control circuit, the limiting resistor 7, the first and second thyristors 8 and 9, the unijunction transistor 10 with an RC circuit consisting of a resistor 11 and a capacitor 12 in the emitter circuit, resistors 13 and 14, and a constant voltage power source a capacitor 15, a zener diode 16, a diode 17 and a filter capacitor 18. As sensors of contact sensors 5 and b, switches can be used on switches, contacts of level sensors, pressure, control buttons, etc. The operation of the regulator is considered, if used, to regulate the level of coarse feeds on the feed transporter. Across the conveyor, above it is a freely suspended plate with a permanent magnet, deflected by the feed conveyed by the conveyor. When the feed layer on the conveyor exceeds the target, the plate under the action of the level of the transported feed is deflected so that the magnet associated with it closes the contacts of the reed switch of the upper level, and another conveyor that supplies the first feed stops. The plate, returning down, closes the magnetic contacts of the low level sensor, and the second transporter turns on, feeding the first conveyor. The regulator works as follows. When it is turned on in the network, the capacitor 18 of the DC power source filter is charged on the Zener diode 16, and under the action of its voltage, the capacitor 12 starts to charge through the resistor 11. When the capacitor 12 is charged, the transistor 10 is unlocked, the latter is unlocked, and the capacitor 12 is discharged through the open transistor 10 to the resistor 14. Under the action of a pulse, the output of the current on the resistor 14 is released, the thyristor 9 is pushed and held in the on position by flowing PICs direct current through the resistor 13 and the anode of the thyristor circuit. Before turning on the thyristor 9, the thyristor 8 and the triac 4 do not even turn on if the sensor 5 is closed. This provides a lightweight start-up of the first conveyor and is-. it switches on the fcopMOM blockage during the start-up process due to the non-activation for the period of the launch of the second conveyor. When the contacts of both sensors are open, the triac 4 is closed and the actuator 1 is turned off. When closing the contacts of sensor 5 (connected to the sensor of the lower level of material) under the action of the voltage on the capacitor 18 of the filter through the cathode - control transition to the electrode of the triac 4, short-circuited contacts of the sensor 5, the transition control electrode - the cathode of the thyristor 8, limiting resistor 7 and an unlocked thyristor 9 passes direct current, causing unlocking of triac 4 and thyristor 8 along anode circuits. Under the action of direct current flowing through the anode circuit, the thyristor 8 is kept open and, after opening, For example, under the action of the level of the material, the contacts of the sensor 5. Triac 4, by keeping the thyristor 8 in the unlocked state, is also open, and the actuator 1 is turned on, ensuring that the second conveyor is turned on and feed is fed to the first conveyor, at which the feed level is maintained. When the contacts of the sensor b are closed, the anode-cathode 8 of the thyristor 8 and the cathode control of the triac electrode 4 connected in series are shunted, and the thyristor 8 and triac 4 are closed. The actuator 1 and the second conveyor are disconnected. Now executive unit 1 is switched on only after the contacts of sensor 5 are closed. Thus, the introduction of a second thyristor and a single junction transistor with an RC-junction into the emitter circuit connected to the source

Claims (2)

Claim On-off controller containing an actuator, through 2 Oh ...... ....................... triac connected to AC power, the first thyristor connected by a cathode to the negative terminal of a DC power source , the positive terminal of which is connected to the cathode of the triac connected in series with the first thyristor limiting resistor, unijunction transistor with RC-kohturom in the emitter circuit, wherein the first base unijunction transistor connected to a control electrode of the first thyristor _g and the second base and the RC-circuit is connected to the positive terminal power source DC voltage, to which the anode of the first thyristor is connected via a resistor, as well as contact sensors, characterized in that, in order to simplify the regulator, it contains a second thyristor, through which the control electrode of the triac is connected to the second output of the limiting resistor, the cathodes of the second thyristor and triacs are connected through the first contact sensor, and their control electrodes are connected through the second contact sensor.