SU1319190A1 - Device for controlling power - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular, to converter technology, and can be used in devices for controlling Lenin power regulators. The purpose of the invention is to improve the accuracy of regulation. To accelerate the heating of the load to the temperature set by the unit 2 in the upper 5 and lower 7 levels, the operator closes the keys corresponding to the temperature limit range. A single vibrator 28 generates a pulse that ensures the opening of the triac keys 17-19 and the activation of heaters 24-26 according to the TRIANGLE scheme. In steady-state mode, when the temperature drops below a predetermined value at the output of the threshold element 4, an O signal is set, which ensures the switching of the triac keys 17-19 to a state that provides less power in the load. The use of the upper 5 and lower 7 levels, the inverter 6, the encoder 8 in the control circuit of the controllers allows an increase in the number of control stages, thereby achieving the goal. 2 ill., 1 tab. O, L (L with "" WITH with Figure 1

Description

ten

15

20

one

The invention relates to electrical engineering, in particular, to converter equipment, and can be used in devices for controlling power regulators of electrothermal installations connected to an AC network.

The purpose of the invention is to improve the accuracy of regulation.

FIG. 1 shows the scheme of the proposed device, powered by a four-wire network; Fig. 2 shows a replacement circuit for a three-phase regulator at various stages of regulation.

The device contains a sensor 1 and a sensor 2 of the control parameter, a comparison element 3, the inputs of which are connected to the corresponding outputs of the sensor 1 and a control parameter setting device 2, and the output is connected to the input of the threshold element 4. The input of the upper level setting device 5 is connected to the output of the threshold element 4 and the input of the inverter 6, the output of which is connected to the input of the unit 7 of the lower level. The outputs of the external level setting device 5 and the lower level setting device 7 are connected to the corresponding inputs of the encoder 8, the outputs of which are connected to the corresponding address inputs of the storage device 9. The outputs of the storage device 9 are connected to the inputs of the drivers 10-16 of the pulses, the outputs of which are connected to the control inputs of the corresponding synchronizers 17-23, connecting in various ways the load elements 24-26 with a four-wire three-phase network. The output of the trigger 27 is connected to the address input of the highest bit of the storage device 9. The first input of the trigger 27 is connected to the output of the one-shot 28, and the second input is connected to the input of the setpoint 7 of the lower level of the control parameter. The dials of the upper 5 and lower 7 levels are made on ten keys each, which corresponds to all possible schemes. The connection device works as follows.

If at the initial moment of time the heating unit is completely cooled, it is necessary to quickly heat the unit to the temperature control parameter set by parameter 2. To do this, in the setters of the upper 5 and lower 7 levels of operators, keys are clamped corresponding to the limit range within which a given temperature can be found and in the furnace zone, the average value of this temperature is determined by setting control parameter 2.

 Then power is supplied to the control circuit. Since the temperature of the heating installation is still below a predetermined value, then the output of the threshold element 4 is a signal o. This signal through the closed key of the setting device 5 is sent to one of the entrances of the encoder 8, which generates at its outputs a binary code corresponding to the number of the closed key in the unit 5 of the upper level. This code is applied to the address inputs of the transmitting unit 9. At the same time as the supply voltage is applied to the one-shot control circuit 28, a short single pulse is generated.

This impulse sets the triple 35 ger 27 to such a state that at its output a signal 1 appears, which is fed to the most significant bit of the address inputs of the storage device 9, as a result, a binary five digits are set at its address inputs

a code that provides such an interface to the outputs of the memory device 9 that the triac keys 17-19 are opened and the heaters 24-26 are turned on according to the TRIANGLE scheme. This ensures that the unit is heated to the set temperature with the maximum speed. The heating process is characterized by a certain combination of 45

neither the load elements 24-26 (Fig.2), 50 gic 1 and O on the elements of the sys- tem, and therefore the levels of the parameter of the control theme, for example, in construction sections 11-20 (table).

The device works as follows.

If at the initial moment of time the heating unit is completely cooled, it is necessary to quickly heat the unit to the temperature control parameter set by parameter 2. To do this, in the setters of the upper 5 and lower 7 levels of operators, keys corresponding to E are closed, and there is a limit within which a given temperature can be found in the furnace zone, the average value of this temperature is determined by setting control parameter 2.

20

 Then power is supplied to the control circuit. Since the temperature of the heating installation is still below a predetermined value, then the output of the threshold element 4 is a signal o. This signal through the closed key of the setting device 5 is sent to one of the entrances of the encoder 8, which generates at its outputs a binary code corresponding to the number of the closed key in the unit 5 of the upper level. This code is applied to the address inputs of the transmitting unit 9. At the same time as the supply voltage is applied to the one-shot control circuit 28, a short single pulse is generated.

This impulse sets the triple 35 ger 27 to such a state that at its output a signal 1 appears, which is fed to the most significant bit of the address inputs of the storage device 9, as a result, a binary five digits are set at its address inputs

a code that provides such an interface to the outputs of the memory device 9 that the triac keys 17-19 are opened and the heaters 24-26 are turned on according to the TRIANGLE scheme. This ensures that the unit is heated to the set temperature with the maximum speed. The heating process is characterized by a certain combination of 45

When a predetermined temperature is reached, which is detected by sensor 1, threshold element 4 is activated so that its output is set to-. 1 and the output of the inverter 6 is O. The front 1-0 from the output of the inverter 6fc places the trigger 27 in another steady state with the signal O at its output, which remains for the rest of the time until the beginning of the new cycle

accelerated heating, which is reflected in the table when the status of the address inputs in lines 1-10.

In addition, the signal O through a closed key setter 7 of the lower level is supplied to one of the inputs of the encoder 8, which generates at its outputs a binary code corresponding to the number of the closed key in the unit 7 of the lower level. This code is supplied

to the address inputs of the memory device 9. According to this address, a combination of 1 is formed at its outputs, which leads to the formation of control pulses and the opening of the corresponding triacs.

After the installation is heated to the required temperature fixed by the sensor 1, the heaters switch to the circuits (Fig 2), ensuring the temperature range specified by the setters of the upper 5 and lower 7 levels.

When the installation temperature drops below the set value at the output of the threshold element 4, a signal O is set. This signal is fed through one of the inputs of the encoder 8 through the closed key of the upper setpoint generator 5, which generates the address code for the storage device 9. At the same time, the output of the trigger 27 the O value remains. Therefore, the memory device 9 forms at its outputs a combination of 1 and O, which corresponds to the closed key in the upper level setting unit 5, and, consequently, to the heating circuit of the heaters. This ensures the necessary speed and smoothness of heating the unit to the desired temperature.

AB AB

five

Formula of Invention

A power control device comprising a comparison element, a sensor and an adjusting parameter setpoint, the outputs of which are connected to the corresponding inputs of the comparison element, a threshold element whose input is connected to the output of the comparison element, and a pulse shaper, in order to improve the control accuracy. , upper and lower level sensors, an encoder, a memory device, a one-shot, trigger, an inverter are introduced, and the upper level setpoint input is connected to the output of the threshold element nta and the input of the inverter, the output of which is connected to the input of the lower level setting device, the outputs of the upper setting controller and its levels are connected to the corresponding address inputs of the storage device, the outputs of the storage device are connected to the inputs of the pulse formers, the trigger output is connected to the address input older than the. memory device, the first and second trigger inputs are connected respectively with the output of the one-shot and the input of the setpoint of the lower level.

S about A B A B C

0

five

t

3i

(Rig.2

Compiled by V.Rudensky Editor I.Shulla Tehred N.Glushchenko

24 26

to

Proofreader V. But ha

Order 2524/51 Circulation 660 Subscription

VNSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow,, Raushsk nab., d, 4/5

Production and printing company, Uzhgorod, Proektna St., 4

Claims (1)

Claim A device for regulating power, containing a comparison element, 5 a sensor and a regulator of a control parameter, the outputs of which are connected to the corresponding inputs of the comparison element, a threshold element, the input of which is connected to the output of the comparison element, and a pulse shaper, characterized in that, in order to improve the accuracy of regulation When the installation temperature drops below a predetermined value, the signal 0 is set at the output of the threshold element 4. This signal is supplied through a closed key of the top-level setter 5 to one of the inputs of the encoder 8, which generates an address code for the storage device 9. At the same time, the output of the trigger 27 the value remains 0. Therefore, the storage device 9 generates at its outputs such a combination of 1 and 0, inputs, the sensors of the upper and lower levels, an encoder, a storage device, a single vibrator, a trigger, an inverter are introduced, and the input of the master of the upper level is connected to the output of the threshold element and the input of the inverter, the output of which is connected to the input 20 of the master of the lower level, the outputs of the master of the upper and lower levels are connected to the corresponding address inputs of the memory device, the outputs of the memory device are connected to the inputs of the formers which corresponds to the closed key in the master 5 of the upper level, and therefore the connection diagram of the heaters. This provides the necessary speed and smoothness of the heating of the pulses, the trigger output is connected to the address input of the senior discharge of the storage device, the first and second inputs of the trigger are connected respectively to the output of the one-shot and from the setting to the set temperature. ABC input