SU365691A1 - ALL-UNION • - Google Patents

Description

one

The invention can be used for technological purposes when drying and firing various materials.

A device for controlling and stabilizing a temperature is known, which comprises a thermocouple, an amplifier, a sensor of modulus, a program setpoint controller, a controller, and a heater.

A disadvantage of the known device is a large dynamic error.

The proposed device differs from the well-known in that it additionally has a serially connected functional amplifier and a differentiating unit, the outputs of which are connected to one of the adder inputs through the multiplication unit, to the other output of which the second additionally set differentiator is connected through the comparison unit. block, the input of which is connected to the program master.

This allows to improve the accuracy of the device.

Diagram of the device for temperature control is shown in pa drawing.

Heater Y is connected to the non-temporal current network through the actuator 2 (made, for example, in the form of a thoristor or ignitron controlled contactor) connected to the amplifier-driver 5 trigger pulses. A temperature sensor (thermocouple, automatically pyrometer, etc.) 5 connected through a functional amplifier 6 to the comparison unit 7. associated with the setting device 8 of the heating program, with a differential block H1 9 and with adder 10.

To the heater / also connected // electric power, the output of which is equipped with a functional amplifier / 2 connected directly and through a block in the wiring area 13 with a unit of multiple 14, KOTOpblii NODSED 1NSN to SUL1M; 1Gor 10.

The proposed device works as follows.

The signal about the temperature of the investigated material (heating object 4} measured by temperature sensor 5, goes to functional amplifier 6, providing Y. with one side O, amplification and temperature sensor, and on the other - L 1CT Y.

From the output of the functional amplifier C1, the Gnal is fed to the comparison unit 7. where it comes from the signals of the program setter S and the differential unit 9, which determines the rate of change of the program. Thus, when the program changes at a constant speed, the signal of the differentiating unit represents co6oii of one magnitude. It is indicative of the speed of the K1menenp program. When a program changes abruptly, for example, in the case of a transition from heating mode with a constant speed:; S to stabilization mode, the signal of differentiating unit 9 decreases to zero, thereby smoothing the regulator's transient response (reducing possible overshoot).

As a result, the error error signal arrives at the adder 10.

Simultaneously with the measurement of the temperature at the heating facility 4, the electric power released at the heater / with the help of the power sensor 11 is measured. The output signal of the power sensor is linearized and its static Xc is linearized with the help of a fuccical scoop 12.

The signal of the amplifier 12 is fed to the differentiating 13 and replicating 14 blocks, where the signal from the differentiating unit is also not received.

The blocks /./-14 represent the second loop of management, which is the “baking” of regulation.

During the transition from the constant heating rate mode to the temperature stabilization mode, the control signal will decrease (S and, therefore, the regulator is slightly C;: the amount of energy supplied) ui thermoelectric generator. The latter will cause a decrease in the power sensor ::; i-kalov //, functional amplifier 13 and differentiating unit 13, and consequently, quite sharply ;. multiply signal on block 4

(since there is a simultaneous decrease in both factors). The latter will lead to a significant reduction in the control signal of the regulator and its transfer to temperature stabilization mode 5 without overshoot.

In the case of a disturbance, for example, when the supply voltage fluctuates and the heater is heated, the output of block 14 is practically

a signal appears instantaneously, providing a control action to the actuator (controlled contactor 2) but relative to the temperature sensor signal, thereby

5, the disturbance is compensated. even before the temperature sensor reacts to it, which ensures the absence of both static and dynamic errors.

Subject invention

- a device for temperature control, containing a control action shaping unit, the input of which is connected via an adder n comparison unit with a program setpoint, and the output - with a heater to which a power sensor is connected, characterized in that He additionally installed in series connected functional amplifier and differentiating

 the block, the outputs of which are connected through one of the connectors to one of the inputs of the adder, to the other input of which through the comparison block r; the keys the output of the second additionally installed His differentiating block, the input

which is connected to the program master.